Abteilung Geochemie und Isotopengeologie

[["dc.bibliographiccitation.firstpage","5337"],["dc.bibliographiccitation.issue","17"],["dc.bibliographiccitation.journal","PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA"],["dc.bibliographiccitation.lastpage","5341"],["dc.bibliographiccitation.volume","112"],["dc.contributor.author","Herwartz, Daniel"],["dc.contributor.author","Pack, Andreas"],["dc.contributor.author","Krylov, Dmitri"],["dc.contributor.author","Xiao, Yilin"],["dc.contributor.author","Muehlenbachs, Karlis"],["dc.contributor.author","Sengupta, Sukanya"],["dc.contributor.author","Di Rocco, Tommaso"],["dc.date.accessioned","2018-11-07T09:58:18Z"],["dc.date.available","2018-11-07T09:58:18Z"],["dc.date.issued","2015"],["dc.description.abstract","The oxygen isotopic composition of hydrothermally altered rocks partly originates from the interacting fluid. We use the triple oxygen isotope composition (O-17/O-16, O-18/O-16) of Proterozoic rocks to reconstruct the O-18/O-16 ratio of ancient meteoric waters. Some of these waters have originated from snowball Earth glaciers and thus give insight into the climate and hydrology of these critical intervals in Earth history. For a Paleoproterozoic [similar to 2.3-2.4 gigayears ago (Ga)] snowball Earth, delta O-18 = -43 +/- 3 parts per thousand is estimated for pristine meteoric waters that precipitated at low paleo-latitudes (<= 35 degrees N). Today, such low O-18/O-16 values are only observed in central Antarctica, where long distillation trajectories in combination with low condensation temperatures promote extreme O-18 depletion. For a Neoproterozoic (similar to 0.6-0.7 Ga) snowball Earth, higher meltwater delta O-18 estimates of -21 +/- 3% imply less extreme climate conditions at similar paleolatitudes (<= 35 degrees N). Both estimates are single snapshots of ancient water samples and may not represent peak snowball Earth conditions. We demonstrate how O-17/O-16 measurements provide information beyond traditional O-18/O-16 measurements, even though all fractionation processes are purely mass dependent."],["dc.identifier.doi","10.1073/pnas.1422887112"],["dc.identifier.isi","000353554000040"],["dc.identifier.pmid","25870269"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37341"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0027-8424"],["dc.title","Revealing the climate of snowball Earth from Delta O-17 systematics of hydrothermal rocks"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","401"],["dc.bibliographiccitation.lastpage","428"],["dc.contributor.author","Surma, Jakub"],["dc.contributor.author","Assonov, Sergey"],["dc.contributor.author","Staubwasser, Michael"],["dc.contributor.editor","Bindeman, Ilya"],["dc.contributor.editor","Pack, Andreas"],["dc.date.accessioned","2021-10-01T09:58:16Z"],["dc.date.available","2021-10-01T09:58:16Z"],["dc.date.issued","2021"],["dc.identifier.doi","10.2138/rmg.2021.86.12"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/90028"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-469"],["dc.publisher","Mineralogical Society of America"],["dc.publisher.place","Chantilly, Virginia"],["dc.relation.ispartof","Triple oxygen isotope geochemistry"],["dc.title","Triple Oxygen Isotope Systematics in the Hydrologic Cycle"],["dc.type","book_chapter"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","199"],["dc.bibliographiccitation.journal","Lithos"],["dc.bibliographiccitation.lastpage","211"],["dc.bibliographiccitation.volume","316-317"],["dc.contributor.author","Iovine, Raffaella Silvia"],["dc.contributor.author","Mazzeo, Fabio Carmine"],["dc.contributor.author","Wörner, Gerhard"],["dc.contributor.author","Pelullo, Carlo"],["dc.contributor.author","Cirillo, Gianluca"],["dc.contributor.author","Arienzo, Ilenia"],["dc.contributor.author","Pack, Andreas"],["dc.contributor.author","D'Antonio, Massimo"],["dc.date.accessioned","2020-11-05T15:10:55Z"],["dc.date.available","2020-11-05T15:10:55Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1016/j.lithos.2018.07.009"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/68490"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-352.8"],["dc.relation.issn","0024-4937"],["dc.title","Coupled δ18O-δ17O and 87Sr/86Sr isotope compositions suggest a radiogenic and 18O-enriched magma source for Neapolitan volcanoes (Southern Italy)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Paleoceanography and Paleoclimatology"],["dc.bibliographiccitation.volume","36"],["dc.contributor.author","Fischer, Meike B."],["dc.contributor.author","Oeser, Martin"],["dc.contributor.author","Weyer, Stefan"],["dc.contributor.author","Folco, Luigi"],["dc.contributor.author","Peters, Stefan T. M."],["dc.contributor.author","Zahnow, Fabian"],["dc.contributor.author","Pack, Andreas"],["dc.date.accessioned","2021-06-01T09:41:37Z"],["dc.date.available","2021-06-01T09:41:37Z"],["dc.date.issued","2021"],["dc.identifier.doi","10.1029/2020PA004159"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/84980"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-425"],["dc.relation.eissn","2572-4525"],["dc.relation.issn","2572-4517"],["dc.title","I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quaternary Air"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","282"],["dc.bibliographiccitation.journal","Geochimica et Cosmochimica Acta"],["dc.bibliographiccitation.lastpage","298"],["dc.bibliographiccitation.volume","175"],["dc.contributor.author","Bermingham, K. R."],["dc.contributor.author","Mezger, Klaus"],["dc.contributor.author","Scherer, Erik E."],["dc.contributor.author","Horan, M. F."],["dc.contributor.author","Carlson, R. W."],["dc.contributor.author","Upadhyay, D."],["dc.contributor.author","Magna, T."],["dc.contributor.author","Pack, Andreas"],["dc.date.accessioned","2018-11-07T10:18:13Z"],["dc.date.available","2018-11-07T10:18:13Z"],["dc.date.issued","2016"],["dc.description.abstract","Several nucleosynthetic processes contributed material to the Solar System, but the relative contributions of each process, the timing of their input into the solar nebula, and how well these components were homogenized in the solar nebula remain only partially constrained. The Ba isotope system is particularly useful in addressing these issues because Ba isotopes are synthesized via three nucleosynthetic processes (s-, r-, p-process). In this study, high precision Ba isotope analyses of 22 different whole rock chondrites and achondrites (carbonaceous chondrites, ordinary chondrites, enstatite chondrites, Martian meteorites, and eucrites) were performed to constrain the distribution of Ba isotopes on the regional scale in the Solar System. A melting method using aerodynamic levitation and CO2-laser heating was used to oxidize SiC, a primary carrier of Ba among presolar grains in carbonaceous chondrites. Destruction of these grains during the fusion process enabled the complete digestion of these samples. The Ba isotope data presented here are thus the first for which complete dissolution of the bulk meteorite samples was certain. Enstatite chondrites, ordinary chondrites, and all achondrites measured here possess Ba isotope compositions that are not resolved from the terrestrial composition. Barium isotope anomalies are evident in most of the carbonaceous chondrites analyzed, but the Ba-135 anomalies are generally smaller than previously reported for similarly sized splits of CM2 meteorites. Variation in the size of the Ba-135 anomaly is also apparent in fused samples from the same parent body (e.g., CM2 meteorites) and in different pieces from the same meteorite (e.g., Orgueil, CI). Here, we investigate the potential causes of variability in Ba-135, including the contribution of radiogenic Ba-135 from the decay of Cs-135 and incomplete homogenization of the presolar components on the <0.8 g sample scale. (C) 2015 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.gca.2015.11.006"],["dc.identifier.isi","000369070000019"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41393"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","1872-9533"],["dc.relation.issn","0016-7037"],["dc.title","Barium isotope abundances in meteorites and their implications for early Solar System evolution"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","67"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Journal of Petrology"],["dc.bibliographiccitation.lastpage","98"],["dc.bibliographiccitation.volume","53"],["dc.contributor.author","Slaby, Ewa"],["dc.contributor.author","Martin, Herve"],["dc.contributor.author","Hamada, Morihisa"],["dc.contributor.author","Smigielski, Michal"],["dc.contributor.author","Domonik, Andrzej"],["dc.contributor.author","Goetze, Jens"],["dc.contributor.author","Hoefs, Jochen"],["dc.contributor.author","Halas, Stanislaw"],["dc.contributor.author","Simon, Klaus"],["dc.contributor.author","Devidal, Jean-Luc"],["dc.contributor.author","Moyen, Jean-Francois"],["dc.contributor.author","Jayananda, Mudlappa"],["dc.date.accessioned","2018-11-07T09:15:55Z"],["dc.date.available","2018-11-07T09:15:55Z"],["dc.date.issued","2012"],["dc.description.abstract","Growth and regrowth textures, trace element and oxygen isotope compositions, and water content or species have been studied in alkali feldspars from the late Archaean Closepet igneous bodies. Feldspar crystals grew from mixed magmas that are characterized by a high degree of homogenization. The 3D depiction of trace element distribution indicates that the crystallization process was followed by interaction with fluids. The magmatic system involved in feldspar formation shows non-linear dynamics. The interaction with fluids is also deterministic, but in contrast to magmatic crystallization, it shows an increasing persistency in element behaviour. The degree of persistency of the element activities in both processes has been calculated using the Hurst exponent. The recrystallization (regrowth) process induced by fluids proceeded along crystal fractures and cleavages, causing selective enrichment in large ion lithophile elements (light rare earth elements), Pb, Y, and in various water species. It did not change the feldspar oxygen isotope signature. In turn, the incorporation of hydrogen species into feldspar domains reduced Al-O--Al defect densities in the structure, decreasing their luminescence. Water speciation shows persistent behaviour during heating, the process being reversible at least up to 600 degrees C. Carbonate crystals with a mantle isotope signature are associated with the re-equilibrated feldspar domains. The feldspar compositions, the abundance of water species in them and the refractory nature of the residuum after heating, the unchanged oxygen isotopes and the mantle signature of co-precipitated carbonates testify that the observed recrystallization has taken place at temperatures above 600 degrees C with H2O-CO2 fertile, mantle-derived fluids. The paper draws special attention to some methodological aspects of the problem. The multi-method approach used here (major element, trace element and isotope geochemistry, infra-red, cathodoluminescence, 3D depiction of geochemical data and fractal statistics) may help to recognize and separate the various processes throughout the alteration history of the pluton."],["dc.description.sponsorship","IGSci PASci 'Hybrid'; IGSci PASci-CNRS-UMR [6524-LMV]"],["dc.identifier.doi","10.1093/petrology/egr056"],["dc.identifier.isi","000299347800004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27815"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Oxford Univ Press"],["dc.relation.issn","0022-3530"],["dc.title","Evidence in Archaean Alkali Feldspar Megacrysts for High-Temperature Interaction with Mantle Fluids"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","85"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Lithos"],["dc.bibliographiccitation.lastpage","97"],["dc.bibliographiccitation.volume","105"],["dc.contributor.author","Slaby, Ewa"],["dc.contributor.author","Goetze, Jens"],["dc.contributor.author","Woerner, Gerhard"],["dc.contributor.author","Simon, Klaus"],["dc.contributor.author","Wrzalik, Roman"],["dc.contributor.author","Smigielski, Michal"],["dc.date.accessioned","2018-11-07T11:11:41Z"],["dc.date.available","2018-11-07T11:11:41Z"],["dc.date.issued","2008"],["dc.description.abstract","The crystallization history of zoned K-feldspar phenocrysts in microgranular magmatic enclaves in the Karkonosze granite (SW Poland) reveals that the crystals grew in stirred coeval magmas of contrasting compositions. The growth mechanism and crystal compositions are investigated using cathodoluminescence and profiling by Electron Microprobe and Laser Ablation ICP-MS. These methods provide insight into the crystallization process and the varying compositions of the host melt. The phenocrysts show two types of growth patterns - with or without resorption interfaces. The trace-element distribution, heterogeneous across different zones and within single phenocryst zones, reflects a dynamic process of crystal growth from compositionally heterogeneous magma. Hybridization is also reflected in the density of structural Al-O--Al defects - features that relate to coupled Ba-Al incorporation into the crystal structure. Differences in structural-defect densities and crystal composition trace the degree of hybridization in the granitic magma during the growth of the K-feldspar phenocrysts. (C) 2008 Elsevier B.V. All rights reserved."],["dc.description.sponsorship","[BW 1642]; [BST 1241/8]; [NN307176633]"],["dc.identifier.doi","10.1016/j.lithos.2008.02.006"],["dc.identifier.isi","000260993100008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/53489"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","0024-4937"],["dc.title","K-feldspar phenocrysts in microgranular magmatic enclaves: A cathodoluminescence and geochemical study of crystal growth as a marker of magma mingling dynamics"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Precambrian Research"],["dc.contributor.author","Oyhantçabal, P."],["dc.contributor.author","Oriolo, S."],["dc.contributor.author","Basei, M. A. S."],["dc.contributor.author","Frei, D."],["dc.contributor.author","Klaus, J."],["dc.contributor.author","Wemmer, Klaus"],["dc.contributor.author","Siegesmund, Siegfried"],["dc.date.accessioned","2022-03-23T08:36:37Z"],["dc.date.available","2022-03-23T08:36:37Z"],["dc.date.issued","2016"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/105045"],["dc.relation.orgunit","Abteilung Strukturgeologie und Geodynamik"],["dc.title","Provenance and tectonic affinity of metasedimentary rocks of the western Dom Feliciano Belt in Uruguay: Insights from U-Pb detrital zircon geochronology, Hf isotopes, Sm-Nd whole-rock model ages and geochemical data"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Geochemistry, Geophysics, Geosystems"],["dc.bibliographiccitation.volume","23"],["dc.contributor.author","Kempton, Pamela D."],["dc.contributor.author","Mathur, Ryan"],["dc.contributor.author","Harmon, Russell S."],["dc.contributor.author","Bell, Aaron"],["dc.contributor.author","Hoefs, Jochen"],["dc.contributor.author","Shaulis, Barry"],["dc.date.accessioned","2022-10-04T10:21:10Z"],["dc.date.available","2022-10-04T10:21:10Z"],["dc.date.issued","2022"],["dc.identifier.doi","10.1029/2022GC010436"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/114342"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-600"],["dc.relation.eissn","1525-2027"],["dc.relation.issn","1525-2027"],["dc.rights.uri","http://creativecommons.org/licenses/by-nc-nd/4.0/"],["dc.title","Cu‐Isotope Evidence for Subduction Modification of Lithospheric Mantle"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","285"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Bulletin of Volcanology"],["dc.bibliographiccitation.lastpage","300"],["dc.bibliographiccitation.volume","71"],["dc.contributor.author","Arienzo, Ilenia"],["dc.contributor.author","Civetta, Lucia"],["dc.contributor.author","Heumann, Arnd"],["dc.contributor.author","Woerner, Gerhard"],["dc.contributor.author","Orsi, G."],["dc.date.accessioned","2018-11-07T08:30:56Z"],["dc.date.available","2018-11-07T08:30:56Z"],["dc.date.issued","2009"],["dc.description.abstract","New Sr and Nd isotope data for whole rocks, glasses and minerals are combined to reconstruct the nature and origin of mixing end-members of the 200 km(3) trachytic to phonolitic Campanian Ignimbrite (Campi Flegrei, Italy) magmatic system. The least-evolved magmatic end-member shows equilibrium between host glass and the majority of the phenocrysts and is less radiogenic in Sr and Nd than the most-evolved magma. On the contrary, only the Fe-rich pyroxene from the most-evolved erupted magma is in equilibrium with the matrix glass, while all other minerals are in isotopic disequilibrium. These magmas mixed prior to and during the Campanian Ignimbrite eruption and minerals were freely exchanged between the magma batches. Combining the results of the geochemical investigations on magma end-members with geophysical and geological data, we develop the following scenario. In stage 1, a parental, less differentiated magma rose into the middle crust, and evolved through combined crustal assimilation and crystal fractionation. In stage 2, the differentiated magma rose to shallower depth, fed the pre-Campanian Ignimbrite activity and evolved by further open-system processes into the most-evolved and most-radiogenic Campanian Ignimbrite end-member magma. In stage 3, new trachytic magma, isotopically distinct from the pre-Campanian Ignimbrite magmas, rose from ca. 6 km to shallower depth, recharged the most-evolved pre-Campanian Ignimbrite magma chamber, and formed the large and stratified Campanian Ignimbrite magmatic system. During the course of the Campanian Ignimbrite eruption, the two layers were tapped separately and/or simultaneously, and gave rise to the range of chemical and isotopic values displayed by the Campanian Ignimbrite pumices, glasses and minerals."],["dc.description.sponsorship","INGV-DPC Project-Campi Flegrei; [EVG1-2001-00046-ERUPT]"],["dc.identifier.doi","10.1007/s00445-008-0223-0"],["dc.identifier.isi","000264175500004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17006"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0258-8900"],["dc.title","Isotopic evidence for open system processes within the Campanian Ignimbrite (Campi Flegrei-Italy) magma chamber"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]