Kerkhof, Alfons M. van den

[["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","1"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Contributions to Mineralogy and Petrology"],["dc.bibliographiccitation.lastpage","16"],["dc.bibliographiccitation.volume","139"],["dc.contributor.author","Xiao, Y. L."],["dc.contributor.author","Hoefs, Jochen"],["dc.contributor.author","van den Kerkhof, Alfons M."],["dc.contributor.author","Fiebig, J."],["dc.contributor.author","Zheng, Y."],["dc.date.accessioned","2018-11-07T10:52:56Z"],["dc.date.available","2018-11-07T10:52:56Z"],["dc.date.issued","2000"],["dc.description.abstract","The coesite-bearing eclogites and associated ultramafic rocks of Bixiling form the largest metamorphic complex in the Dabie-Sulu ultrahigh-pressure (UHP) metamorphic belt. They mainly consist of \"fresh' eclogite, kyanite-rich eclogite, retrograded eclogite and garnet peridotite. Fluid inclusion and oxygen isotope studies have been carried out on the different types of eclogite and peridotite in order to identify the role of fluids during the metamorphic evolution culminating in UHP metamorphism. Five types of fluid inclusions were distinguished based on textural criteria and fluid compositions: (1) primary Ca-rich brines in quartz blebs in kyanite; (2) primary NaCl-dominated high-salinity inclusions in omphacite and kyanite; (3) primary NaCl-dominated medium- to high-salinity inclusions in matrix quartz; (4) carbonic inclusions in omphacite and matrix quartz, (5) secondary low-salinity aqueous (or pure water) inclusions in matrix quartz. The Ca-rich fluid inclusions in quartz blebs in kyanite represent the earliest recognizable fluids (prograde metamorphism) as they largely escaped late re-equilibration. Fluid inclusions in omphacite and kyanite may have been trapped during peak metamorphic conditions, whereas low-salinity aqueous inclusions in matrix quartz were trapped during the latest stage of uplift. UV-laser oxygen isotope measurements show that garnet and clinopyroxene from the \"fresh\" eclogite, kyanite-rich eclogite and garnet peridotite have narrow delta(18)O values ranging from 3.0 to 3.9 parts per thousand. In contrast, garnet and omphacite in retrograded eclogite have delta(18)O values of -1.8 to -1.2 and of -1.1 to -0.6 parts per thousand,, respectively. The difference in oxygen isotope composition is interpreted to result from partial oxygen isotope exchange between the UHP complex and retrograde fluids during late exhumation. Fluids derived from the surrounding gneiss were probably responsible for the low-salinity solutions found in secondary fluid inclusions and the lowering of the delta(18)O values of the retrograded eclogite."],["dc.identifier.doi","10.1007/s004100050570"],["dc.identifier.isi","000087429100001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/49233"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0010-7999"],["dc.title","Fluid history of UHP metamorphism in Dabie Shan, China: a fluid inclusion and oxygen isotope study on the coesite-bearing eclogite from Bixiling"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","443"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Contributions to Mineralogy and Petrology"],["dc.bibliographiccitation.lastpage","458"],["dc.bibliographiccitation.volume","152"],["dc.contributor.author","Xiao, Yilin"],["dc.contributor.author","Zhang, Z."],["dc.contributor.author","Hoefs, Jochen"],["dc.contributor.author","van den Kerkhof, Alfons M."],["dc.date.accessioned","2018-11-07T09:09:28Z"],["dc.date.available","2018-11-07T09:09:28Z"],["dc.date.issued","2006"],["dc.description.abstract","In order to reconstruct the formation and exhumation mechanisms of UHP metamorphic terrains, the Chinese Continental Scientific Drilling Program (CCSD) has been carried out in Donghai of the Dabie-Sulu ultrahigh-pressure (UHP) metamorphic belt, East China. Eclogite, gneiss, amphibolite (retrograded from eclogite), ultramafic rocks, and minor schist and quartzite have been drilled. Aiming to reveal the fluid behaviour in a vertical sequence of an UHP slab, we investigated fluid inclusion and oxygen isotope characteristics of selected drillcores from the main hole and the pilot-holes PP2 and ZK 703 of the CCSD. More than 540 laser-ablation oxygen isotope analyses on garnet, omphacite, quartz, kyanite, amphibole, phengite, rutile, epidote, amphibole, plagioclase, and biotite from various rocks in the depth range of 0-3,000 m (mainly eclogite and gneiss) show that the investigated rocks can be divided into two groups: O-18-depleted rocks (as low as delta O-18 = -7.4 degrees for garnet) indicate interaction with cold climate meteoric waters, whereas O-18-normal rocks (with bulk delta O-18 > +5.6 degrees) have preserved the O-isotopic compositions of their protoliths. Meteoric water/rock interaction has reached depths of at least 2,700 m. Oxygen isotope equilibrium has generally been achieved. Isotopic compositions of mineral phases are homogeneous on a mm to cm scale regardless of lithology, but heterogeneous on the scale of a few metres. Oxygen isotope distributions in the vertical sections favour an \"in situ\" origin of the UHP metamorphic rocks. The very negative delta O-18 eclogites usually have higher hydroxyl-mineral contents than the normal delta O-18 rocks, indicating higher water content during UHP metamorphism. Fluid inclusion data suggest that rocks with depleted O-18 compositions have had different fluid histories compared to those with normal delta O-18 values. Rocks with depleted O-18 mainly have primary medium-to-high salinity inclusions in omphacite, kyanite and quartz, and abundant secondary low-salinity or pure water inclusions in quartz, indicating a high-salinity-brine-dominated fluid system during peak UHP metamorphism; no carbonic inclusions have been identified in these rocks. By contrast, primary very high-density CO2 inclusions are commonly found in the rocks with normal delta O-18 values. These observations suggest that fluid and oxygen isotope composition of minerals are related and reflect variable degrees of alterations of the Dabie-Sulu UHP metamorphic rocks."],["dc.identifier.doi","10.1007/s00410-006-0084-5"],["dc.identifier.isi","000240548000003"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26269"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0010-7999"],["dc.title","Ultrahigh-pressure metamorphic rocks from the Chinese Continental Scientific Drilling Project: II Oxygen isotope and fluid inclusion distributions through vertical sections"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","535"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","International Journal of Earth Sciences"],["dc.bibliographiccitation.lastpage","554"],["dc.bibliographiccitation.volume","101"],["dc.contributor.author","Milovsky, Rastislav"],["dc.contributor.author","van den Kerkhof, Alfons M."],["dc.contributor.author","Hoefs, Jochen"],["dc.contributor.author","Hurai, Vratislav"],["dc.contributor.author","Prochaska, Walter"],["dc.date.accessioned","2018-11-07T09:12:29Z"],["dc.date.available","2018-11-07T09:12:29Z"],["dc.date.issued","2012"],["dc.description.abstract","Basal hydraulic breccias of alpine thin-skinned Muran. nappe were investigated by means of cathodoluminescence petrography, stable isotope geochemistry and fluid inclusions analysis. Our study reveals an unusual dynamic fluid regime along basal thrust plane during final episode of the nappe emplacement over its metamorphic substratum. Basal thrusting fluids enriched in O-18, silica, alumina, alkalies and phosphates were generated in the underlying metamorphosed basement at epizonal conditions corresponding to the temperatures of 400-450 degrees C. The fluids fluxed the tectonized nappe base, leached evaporite-bearing formations in hangingwall, whereby becoming oversaturated with sulphates and chlorides. The fluids further modified their composition by dedolomitization and isotopic exchange with the host carbonatic cataclasites. Newly formed mineral assemblage of quartz, phlogopite, albite, potassium feldspar, apatite, dravite tourmaline and anhydrite precipitated from these fluids on cooling down to 180-200 degrees C. Finally, the cataclastic mush was cemented by calcite at ambient anchizonal conditions. Recurrent fluid injections as described above probably enhanced the final motion of the Muran. nappe."],["dc.identifier.doi","10.1007/s00531-011-0685-8"],["dc.identifier.isi","000304186500010"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26954"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1437-3254"],["dc.title","Cathodoluminescence, fluid inclusion and stable C-O isotope study of tectonic breccias from thrusting plane of a thin-skinned calcareous nappe"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","119"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","ACTA PETROLOGICA SINICA"],["dc.bibliographiccitation.lastpage","126"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Fu, B."],["dc.contributor.author","Xiao, Y. L."],["dc.contributor.author","Zheng, Y."],["dc.contributor.author","Touret, JLR"],["dc.contributor.author","van den Kerkhof, Alfons M."],["dc.contributor.author","Hoefs, Jochen"],["dc.date.accessioned","2018-11-07T10:06:09Z"],["dc.date.available","2018-11-07T10:06:09Z"],["dc.date.issued","2000"],["dc.description.abstract","Fluid inclusions in coesite-bearing eclogites and jadeite quartzite from Shuanghe and Bixiling in Dabie Shan have been studied in details. At least five types of fluid inclusions can be identified by microthermometry and Raman analysis: (1) pure N-2; (2) highly brine; (3) CO2(+/-N-2+/-CH4); (4) mixed CO2-H2O; (5) low-salinity aqueous. Pure N-2 inclusions have been observed only in fresh coesite-bearing eclogites, whereas highly brine inclusions exist almost throughout the ultrahigh pressure (UHP) metamorphic rocks. Carbonic inclusions occur mainly along and/or near micro-shear zones, or in strongly deformed jadeite quartzite. Low-salinity aqueous inclusions are limited within retrograded UHP rocks, The N-2 and highly brines, first equilibrated at eclogite conditions, are far remnants of pre-UHP metamorphic volatiles, re-equilibrated with peak metamorphic minerals at a local scale, corresponding to size of crystal (s). The carbonic fluids are externally derived, possibly being infiltrated from neighbouring marble or carbonate metasediments. The low-salinity aqueous fluids may be locally derived from the breakdown of hydrous UHP minerals and exsolution of hydroxyls from nominally anhydrous minerals, or directly introduced into the rocks from the country rocks."],["dc.identifier.isi","000088761700014"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/39035"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Science Press"],["dc.relation.issn","1000-0569"],["dc.title","Fluid inclusions in ultrahigh pressure metamorphic rocks from Shuanghe and Bixiling in Dabie Shan."],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]