Nolte, Nicole

[["dc.bibliographiccitation.issue","23"],["dc.bibliographiccitation.journal","Arabian Journal of Geosciences"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Emam, Ashraf"],["dc.contributor.author","Zoheir, Basem"],["dc.contributor.author","Radwan, Abdelhady Mohammed"],["dc.contributor.author","Lehmann, Bernd"],["dc.contributor.author","Zhang, Rongqing"],["dc.contributor.author","Fawzy, Sherif"],["dc.contributor.author","Nolte, Nicole"],["dc.date.accessioned","2019-07-24T07:53:40Z"],["dc.date.available","2019-07-24T07:53:40Z"],["dc.date.issued","2018"],["dc.description.abstract","The Nuweibi rare-metal granite in the Central Eastern Desert of Egypt is highly evolved fine- to medium-grained leucogranite affected by pervasive albitization and greisenization. The intrusion holds an important tin–tantalum resource in the Egyptian Eastern Desert. Columbite–tantalite and cassiterite disseminations occur within the granite body, while the quartz ± feldspar veins cutting across the Nuweibi granite host only cassiterite disseminations. Microscopically, quartz and alkali-feldspar are the essential mineral constituents of Nuweibi granite, with minor mica (muscovite + rare biotite), while cassiterite, columbite–tantalite, zircon, allanite, beryl, tourmaline, titanite, and fluorite are accessories. Whole-rock geochemistry and micoanalytical data together with laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS) dating of zircon and columbite have been used to constrain the evolution of the granite intrusion and associated mineralization. The Nuweibi granite is weakly peraluminous with extremely low MgO, CaO, TiO2, P2O5, Ba, and Sr contents and elevated Sn, Ta, Nb, and Rb contents. The REE patterns exhibit distinct tetrad effects, as well as negative Eu and Y anomalies. Also, the bulk rock Zr/Hf ratios are consistently < 10. The Nd isotopic system is disturbed and εNd values suggest a juvenile mantle and/or Neoproterozoic crustal source. The U–Pb system in zircon is disturbed and leaked continuously, while the U–Pb age of columbite is ~ 620 Ma. The geochemical and isotopic systematics of the Nuweibi intrusion reflect very advanced degree of fractionation combined with late magmatic fluid overprint which redistributed Sn and other mobile elements, while Ta still characterizes the igneous system."],["dc.identifier.doi","10.1007/s12517-018-4051-z"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/61970"],["dc.language.iso","en"],["dc.relation.issn","1866-7511"],["dc.relation.issn","1866-7538"],["dc.title","Petrogenesis and evolution of the Nuweibi rare-metal granite, Central Eastern Desert, Egypt"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","728"],["dc.bibliographiccitation.journal","Ore Geology Reviews"],["dc.bibliographiccitation.lastpage","739"],["dc.bibliographiccitation.volume","102"],["dc.contributor.author","Cabral, Alexandre Raphael"],["dc.contributor.author","van den Kerkhof, Alfons M."],["dc.contributor.author","Sosa, Graciela Miriam"],["dc.contributor.author","Nolte, Nicole"],["dc.contributor.author","Ließmann, Wilfried"],["dc.contributor.author","Lehmann, Bernd"],["dc.date.accessioned","2019-07-24T07:51:07Z"],["dc.date.available","2019-07-24T07:51:07Z"],["dc.date.issued","2018"],["dc.description.abstract","Clausthalite and tiemannite from the type locality, Clausthal, in the Harz Mountains, Germany, have virtually gone undocumented since their discovery in the nineteenth century. The minerals and their selenide assemblages are here documented in historical samples from the Königin Charlotte mine in the former Clausthal Pb–Zn–Ag mining district. Clausthalite and tiemannite are the main selenide components; naumannite is generally subordinate, whereas klockmannite and eskebornite are accessory minerals. The absence of inversion lamellae in naumannite constrains the formation temperature to < 130 °C, a temperature that is compatible with salbands of tiemannite and clausthalite that occur in the wall rock of bleached and reddened greywacke along a calcite–quartz veinlet. The veinlet calcite and quartz trapped highly saline, Ca-rich brines (26–33 wt% NaCl equivalent), at temperatures between 96 and 212 °C. Tiemannite and clausthalite also form massive to semi-massive pockets. Tiemannite hosts inclusions of celestine, anhydrite and carrollite. This inclusion assemblage indicates that tiemannite precipitated from sulfate-bearing brines that likely originated from the overlying Zechstein evaporitic sediments. Such an origin is reflected in the less radiogenic 87Sr/86Sr values of 0.70914 and 0.71133 for two samples of tiemannite aggregates containing celestine–anhydrite inclusions. The Clausthal selenide assemblages postdated the main sulfide-bearing, polymetallic vein-style mineralisation of the Harz Mountains."],["dc.identifier.doi","10.1016/j.oregeorev.2018.09.027"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/61968"],["dc.language.iso","en"],["dc.relation.issn","0169-1368"],["dc.title","Clausthalite (PbSe) and tiemannite (HgSe) from the type locality: New observations and implications for metallogenesis in the Harz Mountains, Germany"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","15"],["dc.bibliographiccitation.journal","Geochimica et Cosmochimica Acta"],["dc.bibliographiccitation.volume","71"],["dc.contributor.author","Kleinhanns, Ilka C."],["dc.contributor.author","Nolte, Nicole"],["dc.contributor.author","Baero, Wiebke"],["dc.contributor.author","Hansen, Bent Tauber"],["dc.date.accessioned","2018-11-07T11:00:00Z"],["dc.date.available","2018-11-07T11:00:00Z"],["dc.date.issued","2007"],["dc.identifier.isi","000248789901197"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/50829"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.publisher.place","Oxford"],["dc.relation.conference","17th Annual V M Goldschmidt Conference"],["dc.relation.eventlocation","Cologne, GERMANY"],["dc.title","Is dehydration melting responsible for the evolution of high-K granitic melts throughout the Precambrian?"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2491"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Meteoritics and Planetary Science"],["dc.bibliographiccitation.lastpage","2516"],["dc.bibliographiccitation.volume","48"],["dc.contributor.author","Arp, Gernot"],["dc.contributor.author","Kolepka, Claudia"],["dc.contributor.author","Simon, Klaus"],["dc.contributor.author","Karius, Volker"],["dc.contributor.author","Nolte, Nicole"],["dc.contributor.author","Hansen, Bent Tauber"],["dc.date.accessioned","2018-11-07T09:16:55Z"],["dc.date.available","2018-11-07T09:16:55Z"],["dc.date.issued","2013"],["dc.description.abstract","The extent of impact-generated hydrothermal activity in the 24km sized Ries impact structure has been controversially discussed. To date, mineralogical and isotopic investigations point to a restriction of hydrothermal activity to the impact-melt bearing breccias, specifically the crater-fill suevite. Here, we present new petrographic, geochemical, and isotopic data of postimpact carbonate deposits, which indicate a hydrothermal activity more extended than previously assumed. Specifically, carbonates of the Erbisberg, a spring mound located upon the inner crystalline ring of the crater, show travertine facies types not seen in any of the previously investigated sublacustrine soda lake spring mounds of the Ries basin. In particular, the streamer carbonates, which result from the encrustation of microbial filaments in subaerial spring effluents between 60 and 70 degrees C, are characteristic of a hydrothermal origin. While much of the primary geochemical and isotopic signatures in the mound carbonates have been obliterated by diagenesis, a postimpact calcite vein from brecciated gneiss of the subsurface crater floor revealed a flat rare earth element pattern with a clear positive Eu anomaly, indicating a hydrothermal fluid convection in the crater basement. Finally, the strontium isotope stratigraphic correlation of the travertine mound with the crater basin succession suggests a hydrothermal activity for about 250,000yr after the impact, which would be much longer than previously assumed."],["dc.identifier.doi","10.1111/maps.12235"],["dc.identifier.isi","000329022100009"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28045"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1945-5100"],["dc.relation.issn","1086-9379"],["dc.title","New evidence for persistent impact-generated hydrothermal activity in the Miocene Ries impact structure, Germany"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","13"],["dc.bibliographiccitation.journal","Geochimica et Cosmochimica Acta"],["dc.bibliographiccitation.volume","73"],["dc.contributor.author","Krabbenhoeft, Anja"],["dc.contributor.author","Eisenhauer, A."],["dc.contributor.author","Vollstaedt, H."],["dc.contributor.author","Augustin, N."],["dc.contributor.author","Fietzke, Jan"],["dc.contributor.author","Liebetrau, V."],["dc.contributor.author","Peucker-Ehrenbrink, B."],["dc.contributor.author","Nolte, N."],["dc.contributor.author","Hansen, Bent T."],["dc.date.accessioned","2018-11-07T08:29:15Z"],["dc.date.available","2018-11-07T08:29:15Z"],["dc.date.issued","2009"],["dc.identifier.isi","000267229901620"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16604"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.publisher.place","Oxford"],["dc.relation.conference","19th Annual VM Goldschmidt Conference"],["dc.relation.eventlocation","Davos, SWITZERLAND"],["dc.title","Ocean Sr-budget from paired delta Sr-88/86 and Sr-87/Sr-86 -ratios"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","76"],["dc.bibliographiccitation.journal","Journal of African Earth Sciences"],["dc.bibliographiccitation.lastpage","96"],["dc.bibliographiccitation.volume","92"],["dc.contributor.author","Dill, Harald G."],["dc.contributor.author","Nolte, Nicole"],["dc.contributor.author","Hansen, Bent T."],["dc.date.accessioned","2018-11-07T09:41:58Z"],["dc.date.available","2018-11-07T09:41:58Z"],["dc.date.issued","2014"],["dc.description.abstract","The Neo-Tethyan basin is known for its sediment-hosted Sr deposits in Spain, Turkey, Cyprus, and the Gulf Region. Sediment-hosted Sr-F deposits with base metals formed in the rim sinks and on top of salt domes resulting from halokinesis of Triassic evaporites near the southern edge of the Mediterranean Sea in Tunisia. These evaporites delivered part of the elements, created a basin-and-swell topography and provided the local and regional unconformities to which many of the mineral deposits are related. Five mineralizing processes, each with characteristic sedimentary ore textures, are related to this subsurface salt movement: (1 + 2) Early- and late-stage replacement (\"zebra rocks\"), (3) hydraulic fracturing (\"fitting breccia\" sensu Dill and Weber, 2010b), (4) remobilization (\"spinifex structures\"), and (5) open-space filling (\"caves and vein-like deposits\"). Basinal brines from Mesozoic aquifers delivered Pb, Zn, Cd, REE, Y, Hg, and Se, while Sr, Cs, Be, Li, Cu and Co have been derived from Cenozoic salinas of the Neo-Tethyan basin. Mixing of Mesozoic and Cenozoic brines between 28 and 19 Ma provoked the emplacement of Sr-F mineralization at temperatures below 200 degrees C under strong alkaline conditions. Epigenetic polyphase Sr-F deposits bearing base-metals which are closely related to salt domes (Tunisian-Type) may be traced into epigenetic monophase Sr deposits within bioherms (Cyprus-Type) devoid of Pb, Zn and F. Moving eastward, syndiagenetic monophase Sr deposits in biostromes (Gulf-Type) herald the beginning of Sr concentration in Miocene sabkhas of the Neo-Tethys. The current results are based upon field-related sediment petrography and on mineralogical studies, which were supplemented by chemical studies. The present studies bridge the gap between epigenetic carbonate-hosted MVT and syndiagenetic evaporite deposits, both of which developed during the same time span (Neogene) and were hosted by the same environment (near-shore marine marginal facies of the Neo-Tethys basin). (C) 2014 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.jafrearsci.2014.01.009"],["dc.identifier.isi","000334009100008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/33848"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1879-1956"],["dc.relation.issn","1464-343X"],["dc.title","Lithology, mineralogy and geochemical characterizations of sediment-hosted Sr-F deposits in the eastern Neo-Tethyan region - With special reference to evaporation and halokinesis in Tunisia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","173"],["dc.bibliographiccitation.issue","3-4"],["dc.bibliographiccitation.journal","GFF"],["dc.bibliographiccitation.lastpage","194"],["dc.bibliographiccitation.volume","133"],["dc.contributor.author","Nolte, Nicole"],["dc.contributor.author","Kleinhanns, Ilka C."],["dc.contributor.author","Baero, Wiebke"],["dc.contributor.author","Hansen, Bent T."],["dc.date.accessioned","2018-11-07T09:01:21Z"],["dc.date.available","2018-11-07T09:01:21Z"],["dc.date.issued","2011"],["dc.description.abstract","Granitoid to syenitoid petrogenesis along the Laurentia-Baltica continental margin occurred in two cycles. Within the Fennoscandian Shield, the first cycle is correlated with the 1.95-1.8 Ga Svecofennian domain and the second is correlated with the 1.85-1.65 Ga Transscandinavian Igneous Belt (TIB). Affiliation of Palaeoproterozoic granitoids to syenitoids (similar to 1.8 Ga) in a transitional zone between the Svecofennian domain to the north and the TIB to the south in the Vastervik area in southeast Sweden, is highly debated. In this study, the Vastervik granitoids to syenitoids have been studied for major and trace element, whole-rock Sm-Nd and U-Pb single zircon isotopic compositions. Field observations, petrography and geochemical composition allow discrimination into five groups ranging from tonalitic to syenogranitic compositions. Geochemical signatures indicate magnesian, metaluminous cordilleran character for three of them, whereas the two most differentiated groups show a transition into ferroan, peraluminous granites with postorogenic or A-type characters. The former three groups may be correlated with the TIB-1 suite at 1.81-1.77 Ga. The older of the A-type groups may be correlated with the TIB-0 suite that intruded at 1.87-1.84 Ga whereas the younger group possibly is related to the so-called granite-pegmatite suite. An earlier tectonic model implies a migration of the subduction zone system to the present southwest. The defined granitoid to syenitoid groups of the Vastervik region fit nicely into the model and support the idea of a new tectonic cycle to the south of the Bergslagen region."],["dc.identifier.doi","10.1080/11035897.2011.629308"],["dc.identifier.isi","000299035100006"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/24410"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1103-5897"],["dc.title","Petrography and whole-rock geochemical characteristics of Vastervik granitoids to syenitoids, southeast Sweden: constraints on petrogenesis and tectonic setting at the southern margin of the Svecofennian domain"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","321"],["dc.bibliographiccitation.journal","Lithos"],["dc.bibliographiccitation.lastpage","337"],["dc.bibliographiccitation.volume","212"],["dc.contributor.author","Kleinhanns, Ilka C."],["dc.contributor.author","Whitehouse, Martin J."],["dc.contributor.author","Nolte, Nicole"],["dc.contributor.author","Baero, Wiebke"],["dc.contributor.author","Wilsky, F."],["dc.contributor.author","Hansen, Bent T."],["dc.contributor.author","Schoenberg, R."],["dc.date.accessioned","2018-11-07T10:03:45Z"],["dc.date.available","2018-11-07T10:03:45Z"],["dc.date.issued","2015"],["dc.description.abstract","Observed geochemical and geophysical signatures in the southern Svecofennian domain (SD) and the Transscandinavian Igneous Belt (TIE) are explained through a model of tectonic cycling and episodic southwestward migration of a subduction zone system. The Vastervik area is located between these two major tectonic domains and as such has received much attention. Granitoids of the Vastervik area were recently re-grouped and classified within the context of this larger regional tectonic model, but a discrepancy between previous relative age estimations and the few available granitoid age determinations was noted. To address this issue, we have dated 13 granitoid samples using a high spatial resolution secondary ion mass spectrometry (SIMS) U-Pb technique. Our new results constrain the intrusion of the majority of granitoids to 1819-1795 Ma, thus placing them into the TIB-1 period. This age range also encompasses our new ages from the central granodiorite belt and the Oro-Hamno pluton, demonstrating a previous overestimation of older granitoid generations in the Vastervik area. Nonetheless, it is shown that Askersund/TIB-0 magmatism, represented by an augen gneiss sample dated to 1846 Ma, is unambiguously present as far south as the Vastervik region. The anatectically generated leucogranites reveal TIB-1 ages and, as expected, older inherited zircon derived from the parental metasedimentary Vastervik formation. By simple Sr-Nd isotope modeling it is further possible to deduce that most TIB-1 granitoids follow a simple (assimilation-) fractional crystallization petrogenetic trend. The youngest granitoid generation was produced through low-pressure fluid-absent crustal melting. In conclusion, granitoids of the Vastervik area fit well into the proposed model for south-westward migration of a subduction zone system active in the Svecofennian domain and represent a new tectonic cycle. It is therefore possible to link the Svecofennian domain and the Transscandinavian Igneous Belt within a single evolutionary scenario explaining the observed granitoid petrology, geochemistry and geochronology. The study area is located at the edge of a particularly long-lived active continental margin that started to operate during the supercontinent Columbia at ca. 1.8 Ga and the presented model explains how this margin initiated at its eastern end. (C) 2014 Elsevier B.V. All rights reserved."],["dc.description.sponsorship","Carl-Zeiss-Foundation"],["dc.identifier.doi","10.1016/j.lithos.2014.10.013"],["dc.identifier.isi","000348879200022"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38542"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1872-6143"],["dc.relation.issn","0024-4937"],["dc.title","Mode and timing of granitoid magmatism in the Vastervik area (SE Sweden, Baltic Shield): Sr-Nd isotope and SIMS U-Pb age constraints"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2293"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","International Journal of Earth Sciences"],["dc.bibliographiccitation.lastpage","2315"],["dc.bibliographiccitation.volume","107"],["dc.contributor.author","Siegesmund, S."],["dc.contributor.author","Oriolo, S."],["dc.contributor.author","Heinrichs, T."],["dc.contributor.author","Basei, M. A. S."],["dc.contributor.author","Nolte, N."],["dc.contributor.author","Huttenrauch, F."],["dc.contributor.author","Schulz, B."],["dc.date.accessioned","2019-07-24T07:48:23Z"],["dc.date.available","2019-07-24T07:48:23Z"],["dc.date.issued","2018"],["dc.description.abstract","New U–Pb and Lu–Hf detrital zircon data together with whole-rock geochemical and Sm–Nd data were obtained for paragneisses of the Austroalpine basement south of the Tauern Window. Geochemically immature metasediments of the Northern–Defereggen–Petzeck (Ötztal–Bundschuh nappe system) and Defereggen (Drauzug–Gurktal nappe system) groups contain zircon age populations which indicate derivation mainly from Pan-African orogens. Younger, generally mature metasediments of the Gailtal Metamorphic Basement (Drauzug–Gurktal nappe system), Thurntaler Phyllite Group (Drauzug–Gurktal nappe system) and Val Visdende Formation (South Alpine Basement) were possibly derived from more distant sources. Their significantly larger abundances of pre-Pan-African zircons record a more advanced stage of downwearing of the Pan-African belts and erosion of older basement when the Austroalpine terrane was part of the Early Palaeozoic Northern Gondwana passive margin. Most zircon age spectra are dominated by Ediacaran sources, with lesser Cryogenian, Tonian and Stenian contributions and subordinate Paleoproterozoic and Neoarchean ages. These age patterns are similar to those recorded by Cambro–Ordovician sedimentary sequences in northeastern Africa between Libya and Jordan, and in some pre-Variscan basement inliers of Europe (e.g. Dinarides–Hellenides, Alboran microplate). Therefore, the most likely sources seem to be in the northeastern Saharan Metacraton and the Northern Arabian–Nubian Shield (Sinai), further supported by whole-rock Sm–Nd and zircon Lu–Hf data."],["dc.identifier.doi","10.1007/s00531-018-1599-5"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/61967"],["dc.language.iso","en"],["dc.relation.issn","1437-3254"],["dc.relation.issn","1437-3262"],["dc.relation.orgunit","Abteilung Strukturgeologie und Geodynamik"],["dc.title","Provenance of Austroalpine basement metasediments: tightening up Early Palaeozoic connections between peri-Gondwanan domains of central Europe and Northern Africa"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1125"],["dc.bibliographiccitation.issue","7-8"],["dc.bibliographiccitation.journal","Geological Society of America Bulletin"],["dc.bibliographiccitation.lastpage","1145"],["dc.bibliographiccitation.volume","125"],["dc.contributor.author","Arp, Gernot"],["dc.contributor.author","Blumenberg, Martin"],["dc.contributor.author","Hansen, Bent Tauber"],["dc.contributor.author","Jung, Dietmar"],["dc.contributor.author","Kolepka, Claudia"],["dc.contributor.author","Lenz, Olaf"],["dc.contributor.author","Nolte, Nicole"],["dc.contributor.author","Poschlod, Klaus"],["dc.contributor.author","Reimer, Andreas"],["dc.contributor.author","Thiel, Volker"],["dc.date.accessioned","2018-11-07T09:22:43Z"],["dc.date.available","2018-11-07T09:22:43Z"],["dc.date.issued","2013"],["dc.description.abstract","Scientific drilling conducted at the inner slope of the Miocene central Ries impact crater recovered a partial section of crater lake sediments. Four sequences were recovered, composed of suevite-derived sandstones, thin lignite seams, bituminous shales, and marlstones to claystones. These flooding-evaporation sequences reflect the impact of short-term climatic fluctuations on a hydrologically closed basin. The superimposed trend from sequences rich in bituminous shales in the lower parts of the section to sequences dominated by organic-poor claystones and intercalated lignites in the upper parts of the section resembles that of the 300-m-thick central crater basin succession, which has previously been considered to reflect a climate-controlled development from an alkaline saline lake to a freshwater lake with temporary coal swamps. In the sediment core of Enkingen, however, the change from bituminous shales to organic-poor claystones with intercalated lignites is associated with a general increase in salinity, as indicated by (1) palynomorphs, (2) increase in delta C-13 of the lipid biomarker archaeol (bis-O-phytanylglycerol), and (3) the occurrence of C-13-enriched C-20/C-25-archaeol (O-phytanyl-O-sesterterpanylglycerol) specific to halophilic Archaea. In addition, the unidirectional trend in Sr-87/Sr-86 of carbonates, declining from ratios of Variscan basement rocks toward marine ratios, indicates a change from (1) weathering of crystalline rocks and suevite to (2) ejected Jurassic sediments (Bunte Breccia) in the catchment area as the major source of ion influx to the lake. From that trend, a change in lake water composition and a general increase in ion concentrations are inferred. These new results can be applied to a reassessment of major parts of the lacustrine succession of the Ries crater. We use these data to propose a new hypothetical model for the chemical and ecological evolution of the Ries crater lake: (1) After the establishment of a stratified brackish eutrophic soda lake due to silicate weathering and evaporation, the increasing influx of waters from the Bunte Breccia carbonate and authigenic silicate precipitation led to a mesotrophic halite lake with marine-like ion ratios and concentrations. (2) Further increase in ions, among them Mg2+ and Sr2+, resulted in hypersaline conditions with gypsum precipitation, low primary production, and phreatic Sr-rich do-lomitization in marginal carbonates. (3) The final, sudden change to oligotrophic freshwater conditions is explained by the formation of an outlet late in the lake history. We conclude that the chemical and ecological evolution of the Ries lake therefore appears to have been mainly controlled by the weathering history of the catchment area, with climate fluctuations causing superimposed cycles. Similarly, changes in terrestrial palynomorph associations may at least partly reflect a change in soil types in the catchment area, from fertile, moist soils on suevite to dry karst soils and soils on Bunte Breccia. These interpretations imply that the initial suevite blanket of the Ries crater was much more continuous and widespread than previously assumed."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft [AR 335/5, BL 971/1, BL 971/3, Th 713/3]"],["dc.identifier.doi","10.1130/B30731.1"],["dc.identifier.isi","000323270800005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/29418"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1943-2674"],["dc.relation.issn","0016-7606"],["dc.title","Chemical and ecological evolution of the Miocene Ries impact crater lake, Germany: A reinterpretation based on the Enkingen (SUBO 18) drill core"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]