Kerkhof, Alfons M. van den

[["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.firstpage","2018"],["dc.bibliographiccitation.issue","18"],["dc.bibliographiccitation.journal","Chinese Science Bulletin"],["dc.bibliographiccitation.lastpage","2023"],["dc.bibliographiccitation.volume","48"],["dc.contributor.author","Shen, K."],["dc.contributor.author","Zhang, Z. M."],["dc.contributor.author","van den Kerkhof, Alfons M."],["dc.contributor.author","Xiao, Y. L."],["dc.contributor.author","Xu, Z. Q."],["dc.contributor.author","Hoefs, Jochen"],["dc.date.accessioned","2018-11-07T10:36:23Z"],["dc.date.available","2018-11-07T10:36:23Z"],["dc.date.issued","2003"],["dc.description.abstract","Primary high-density fluid inclusions were identified in garnet from ultrahigh pressure eclogite in the southern part of the Sulu terrane. They occur isolatedly or in cluster together with relatively low-density two-phase inclusions. The eutectic temperature of the inclusions is as low as less than or equal to-52degreesC. A bubble was nucleated in a liquid inclusion during the specific stage of cyclic cooling-heating runs, and the liquid-gas homogenization temperature was measured to be less than or equal to-12.5degreesC. The composition of the inclusions modeled by the system CaCl2-NaCl-H2O, yields the fluid density of 1.27 g/cm(3) that corresponds to a pressure of ca. 2.4 GPa at the temperature of peak eclogite-facies metamorphism, close to the ultrahigh pressure metamorphic conditions. During the exhumation of the eclogite the inclusions reacted with the host mineral, forming hydrous silicate minerals that resulted in lowering of the fluid density and its transformation to multi-phase inclusions."],["dc.identifier.doi","10.1360/02wd0536"],["dc.identifier.isi","000185748100023"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/45311"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Science China Press"],["dc.relation.issn","1001-6538"],["dc.title","Unusual high-density and saline aqueous inclusions in ultrahigh pressure metamorphic rocks from Sulu terrane in eastern China"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","297"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","International Geology Review"],["dc.bibliographiccitation.lastpage","309"],["dc.bibliographiccitation.volume","47"],["dc.contributor.author","Zhang, Z. M."],["dc.contributor.author","Shen, K."],["dc.contributor.author","Xiao, Y. L."],["dc.contributor.author","van den Kerkhof, Alfons M."],["dc.contributor.author","Hoefs, Jochen"],["dc.contributor.author","Liou, J. G."],["dc.date.accessioned","2018-11-07T11:19:57Z"],["dc.date.available","2018-11-07T11:19:57Z"],["dc.date.issued","2005"],["dc.description.abstract","Rocks from the first pre-pilot hole of the Chinese Continental Scientific Drilling Project (CCSD-PPH1, 432 in), located in the eastern part of the Dabie-Sulu ultrahigh-pressure (UHP) metamorphic belt, have been subjected to a coesite-eclogite-facies metamorphic event, followed by an amphibolite-facies overprint. Primary fluid inclusions occur in garnet, omphacite, and apatite from eclogite; in kyanite and in topaz from quartzite; and in garnet, epidote, and apatite from paragneiss. Secondary fluid inclusions are present in all lithologies. Fluid inclusions are absent from ultramafic rocks. Based on fluid compositions and textural criteria we distinguished: (1) low-salinity aqueous-carbonic inclusions in topaz from quartzite, which may have originated from a supracrustal protolith; (2) primary CaCl2-NaCl-rich brine inclusions in garnet and in omphacite from eclogite and in kyanite from quartzite, representing UHP metamorphic fluids; (3) high-salinity aqueous-carbonic inclusions in quartz from eclogite and quartzite, representing amphibolite-facies fluids; (4) aqueous fluids of low- and intermediate salinity trapped as primary inclusions in garnet, epidote (or allanite) and apatite from gneiss, or as secondary inclusions, representing amphibolite-facies and later retrograde fluids; (5) carbonic inclusions are distributed along transgranular fractures in quartz from quartzite, and probably represent the latest retrograde fluid. The diversity in fluid inclusion populations and compositions from different vertical depths suggests a closed fluid system without large-scale fluid migration during UHP metamorphism. However, the common low- and medium-salinity inclusions in most rock types suggests that a water-dominated fluid from an external source infiltrated into the rock system during amphibolite-facies metamorphism, resulting in extensive retrogression of the UHP rocks."],["dc.identifier.doi","10.2747/0020-6814.47.3.297"],["dc.identifier.isi","000227403000005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/55414"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","V H Winston & Son Inc"],["dc.relation.issn","0020-6814"],["dc.title","Fluid composition and evolution attending UHP metamorphism: Study of fluid inclusions from drill cores, southern Sulu Belt, Eastern China"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","292"],["dc.bibliographiccitation.journal","Journal of Asian Earth Sciences"],["dc.bibliographiccitation.lastpage","307"],["dc.bibliographiccitation.volume","172"],["dc.contributor.author","Liu, Haiyang"],["dc.contributor.author","Xiao, Yilin"],["dc.contributor.author","van den Kerkhof, Alfons"],["dc.contributor.author","Wang, Yangyang"],["dc.contributor.author","Zeng, Lingsen"],["dc.contributor.author","Guo, Haihao"],["dc.date.accessioned","2020-12-10T14:25:26Z"],["dc.date.available","2020-12-10T14:25:26Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1016/j.jseaes.2018.09.013"],["dc.identifier.issn","1367-9120"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/72553"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Metamorphism and fluid evolution of the Sumdo eclogite, Tibet: Constraints from mineral chemistry, fluid inclusions and oxygen isotopes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","300"],["dc.bibliographiccitation.journal","Marine and Petroleum Geology"],["dc.bibliographiccitation.lastpage","322"],["dc.bibliographiccitation.volume","77"],["dc.contributor.author","Duschl, Florian"],["dc.contributor.author","van den Kerkhof, Alfons M."],["dc.contributor.author","Sosa, Graciela"],["dc.contributor.author","Leiss, Bernd"],["dc.contributor.author","Wiegand, Bettina A."],["dc.contributor.author","Vollbrecht, Axel"],["dc.contributor.author","Sauter, Martin"],["dc.date.accessioned","2018-11-07T10:06:47Z"],["dc.date.available","2018-11-07T10:06:47Z"],["dc.date.issued","2016"],["dc.description.abstract","New petrographic and fluid inclusion data from core samples of Upper Permian dolomitic limestone (Hauptdolomit, Zechstein group, Stassfurt carbonate sequence) from a gas field located at the northern border of the Lower Saxony Basin (LSB) essentially improve the understanding of the basin development. The gas production at the locality is characterized by very high CO2 concentrations of 75-100% (with CH4 and N-2). Samples consist of fine grained, mostly laminated and sometimes brecciated dolomitic limestone (mudstone/wackestone) from the transition zone between the shallow water zone (platform) and the upper slope. The study focuses on migration fluids, entrapped as fluid inclusions in diagenetic anhydrite, calcite, and fluorite, and in syn-diagenetic microfractures, as well as on the geochemistry of fluorite fracture mineralizations, obtained by LA-ICP-MS analysis. Fluid inclusion studies show that the diagenetic fluid was rich in H2O-NaCl-CaCl2. Recrystallized anhydrite contains aqueous inclusions with homogenization temperatures (T-h) of ca. 123 degrees C, but somewhat higher Th of ca. 142 degrees C was found for calcite cement followed by early Fluorite A with Th of 147 degrees C. A later Fluorite B preserves gas inclusions and brines with maximum Th of 156 degrees C. Fluorite B crystallized in fractures during the mobilization of CO2-bearing brines. Crossing isochores for co-genetic aqueous-carbonic and carbonic inclusions indicate fluid trapping conditions of 180-200 degrees C and 900-1000 bars. delta C-13-isotopic ratios of gas trapped in fluid inclusions suggest an organic origin for CH4, while the CO2 is likely of inorganic origin. Basin modelling (1D) shows that the fault block structure of the respective reservoir has experienced an uplift of >1000 m since Late Cretaceous times. The fluid inclusion study allows us to, 1) model the evolution of the LSB and fluid evolution by distinguishing different fluid systems, 2) determine the appearance of CO2 in the geological record and, 3) more accurately estimate burial and uplift events in individual parts of the LSB. (C) 2016 Elsevier Ltd. All rights reserved."],["dc.description.sponsorship","EU [282900]"],["dc.identifier.doi","10.1016/j.marpetgeo.2016.06.020"],["dc.identifier.isi","000384861400020"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/39159"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1873-4073"],["dc.relation.issn","0264-8172"],["dc.relation.orgunit","Abteilung Strukturgeologie und Geodynamik"],["dc.title","Fluid inclusion and microfabric studies on Zechstein carbonates (Ca2) and related fracture mineralizations - New insights on gas migration in the Lower Saxony Basin (Germany)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","199"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","South African Journal of Geology"],["dc.bibliographiccitation.lastpage","218"],["dc.bibliographiccitation.volume","116"],["dc.contributor.author","Gueye, Mamadou"],["dc.contributor.author","van den Kerkhof, Alfons M."],["dc.contributor.author","Hein, U. F."],["dc.contributor.author","Diene, M."],["dc.contributor.author","Muecke, Arno"],["dc.contributor.author","Siegesmund, Siegfried"],["dc.date.accessioned","2018-11-07T09:17:24Z"],["dc.date.available","2018-11-07T09:17:24Z"],["dc.date.issued","2013"],["dc.description.abstract","The Paleoproterozoic Mako Belt in eastern Senegal is characterised by gold-bearing quartz veins. These are superimposed on the regional Birimian structural complex consisting of volcano-sedimentary and intrusive rocks in an Early Proterozoic greenstone belt. In the Mako Belt the multi-stage deformed quartz veins and hydrothermally altered protoliths are characterised by distinctive microstructures and CL properties. The high-grade Au-bearing quartz veins contain one or more generations of hydrothermal quartz. Brecciation of the veins is indicated by cemented fragments of zoned quartz. Gold in the mineralised zones occurs either as inclusions in pyrite or as native gold. Mineralisation typically occurs in vein systems which are brecciated, laminated, and/or show crack-seal textures. Microstructures indicate syn- to late-tectonic mineralisation. Au-mineralised veins contain quartz, carbonate, muscovite, fuchsite, tourmaline, and chlorite. Fluid inclusion studies reveal early, highly saline aqueous inclusions followed by main-stage aqueous-carbonic inclusions of low salinity and finally aqueous low-salinity inclusions. Petrographic observation and microthermometric data suggest that fluid inclusions in main stage quartz were trapped after phase separation from a heterogeneous H2O-CO2 fluid. Gold deposition occurs over a temperature range of 220 to 320 degrees C and pressures of 1.4 to 2.75 kbar (similar to 5 to 10 km depth). The late-stage quartz carbonate vein corresponds to pressures of 0.75 to 1.25 kbar and depths of 3.0 to 4.5 km. A fluid pressure drop due to fracture failure is likely to have triggered Au precipitation. The Mako Belt Au deposits are comparable to a large number of orogenic lode gold deposits in the West African Craton."],["dc.description.sponsorship","DFG [445 SEN- 17/1/06]"],["dc.identifier.doi","10.2113/gssajg.116.2.199"],["dc.identifier.isi","000209373800002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28156"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1996-8590"],["dc.relation.issn","1012-0750"],["dc.relation.orgunit","Abteilung Strukturgeologie und Geodynamik"],["dc.title","Structural Control, Fluid Inclusions and Cathodoluminescence Studies of Birimian Gold-Bearing Quartz Vein Systems in the Paleoproterozoic Mako Belt, Southeastern Senegal"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","13"],["dc.bibliographiccitation.journal","Geochimica et Cosmochimica Acta"],["dc.bibliographiccitation.volume","73"],["dc.contributor.author","Harlov, Daniel E."],["dc.contributor.author","van den Kerkhof, Alfons M."],["dc.contributor.author","Hansen, Edward"],["dc.contributor.author","Johansson, Leif"],["dc.date.accessioned","2018-11-07T08:29:12Z"],["dc.date.available","2018-11-07T08:29:12Z"],["dc.date.issued","2009"],["dc.format.extent","A495"],["dc.identifier.isi","000267229901221"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16595"],["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.relation.issn","0016-7037"],["dc.title","Magmatism and metamorphism in the middle-lower crust, SW Sweden"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1101"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Nature Communications"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Mißbach, Helge"],["dc.contributor.author","Duda, Jan-Peter"],["dc.contributor.author","van den Kerkhof, Alfons M."],["dc.contributor.author","Lüders, Volker"],["dc.contributor.author","Pack, Andreas"],["dc.contributor.author","Reitner, Joachim"],["dc.contributor.author","Thiel, Volker"],["dc.date.accessioned","2021-06-18T09:58:08Z"],["dc.date.available","2021-06-18T09:58:08Z"],["dc.date.issued","2021"],["dc.description.abstract","It is widely hypothesised that primeval life utilised small organic molecules as sources of carbon and energy. However, the presence of such primordial ingredients in early Earth habitats has not yet been demonstrated. Here we report the existence of indigenous organic molecules and gases in primary fluid inclusions in c. 3.5-billion-year-old barites (Dresser Formation, Pilbara Craton, Western Australia). The compounds identified (e.g., H2S, COS, CS2, CH4, acetic acid, organic (poly-)sulfanes, thiols) may have formed important substrates for purported ancestral sulfur and methanogenic metabolisms. They also include stable building blocks of methyl thioacetate (methanethiol, acetic acid) - a putative key agent in primordial energy metabolism and thus the emergence of life. Delivered by hydrothermal fluids, some of these compounds may have fuelled microbial communities associated with the barite deposits. Our findings demonstrate that early Archaean hydrothermal fluids contained essential primordial ingredients that provided fertile substrates for earliest life on our planet."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2021"],["dc.identifier.doi","10.1038/s41467-021-21323-z"],["dc.identifier.pmid","33597520"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/87260"],["dc.identifier.url","https://publications.goettingen-research-online.de/handle/2/82668"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","2041-1723"],["dc.relation.issn","2041-1723"],["dc.relation.orgunit","Abteilung Geobiologie"],["dc.rights","CC BY 4.0"],["dc.title","Ingredients for microbial life preserved in 3.5 billion-year-old fluid inclusions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","1-3"],["dc.bibliographiccitation.journal","Chemical Geology"],["dc.bibliographiccitation.lastpage","2"],["dc.bibliographiccitation.volume","223"],["dc.contributor.author","Szabo, C."],["dc.contributor.author","van den Kerkhof, Alfons M."],["dc.contributor.author","Bodnar, R. J."],["dc.date.accessioned","2018-11-07T10:54:10Z"],["dc.date.available","2018-11-07T10:54:10Z"],["dc.date.issued","2005"],["dc.identifier.doi","10.1016/j.chemgeo.2005.05.007"],["dc.identifier.isi","000233694200001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/49507"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","0009-2541"],["dc.title","Preface - New results in fluid and silicate melt inclusion research - ECROFI XVII"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.subtype","letter_note"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","637"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Contributions to Mineralogy and Petrology"],["dc.bibliographiccitation.lastpage","652"],["dc.bibliographiccitation.volume","146"],["dc.contributor.author","van den Kerkhof, Alfons M."],["dc.contributor.author","Kronz, A."],["dc.contributor.author","Simon, Klaus"],["dc.contributor.author","Scherer, T."],["dc.date.accessioned","2018-11-07T10:52:16Z"],["dc.date.available","2018-11-07T10:52:16Z"],["dc.date.issued","2004"],["dc.description.abstract","Dispersed quartz veinlets in Proterozoic enderbitic charnockite from Tromoy, Bamble sector (southern Norway), with Ti-concentrations of mostly 80-180 ppm, produce bright blue cathodoluminescence (CL), against contrasting micro-textures of secondary pure quartz with low CL intensity. The textures comprise grain boundary alteration, healed micro-fractures, patches of secondary quartz, and euhedral quartz nuclei. The secondary quartz locally makes up 50% of the total quartz. Trace element analysis has been done by electron-probe micro-analysis (EPMA), laser-induced coupled plasma mass spectrometry (LA-ICPMS), and additional electron-paramagnetic resonance (EPR) spectroscopy. These studies testify systematic trace element reduction and extensive quartz recovery during retrograde metamorphism. We assume healing of a part of the aqueous fluid inclusions during a late thermal event, possible correlated with Paleozoic magmatic activity in the Oslo-Rift. During final cooling, aqueous fluids were largely retrapped in patches of secondary quartz associated with healed fractures, whereas carbonic inclusions (without secondary quartz) may have survived retrograde metamorphism. The variable but generally high salinity of fluid inclusions is assumed to be in part the result of quartz recovery by which ion concentrations were increased in the percentage range."],["dc.identifier.doi","10.1007/s00410-003-0523-5"],["dc.identifier.isi","000188246200008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/49077"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1432-0967"],["dc.relation.issn","0010-7999"],["dc.title","Fluid-controlled quartz recovery in granulite as revealed by cathodoluminescence and trace element analysis (Bamble sector, Norway)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]