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Selective metasomatism of ultramafic cumulates within Archean supracrustal sequences

Geoscience Frontiers 2024年第5期15卷 283-299页

作者： Lingyu Zhang Sampriti Basak David Zakharov Kristoffer Szilas Department of Geosciences and Natural Resource Management University of CopenhagenØster Voldgade 101350 CopenhagenDenmark Geological and Environmental Sciences Western Michigan UniversityKalamazooMI 49008USA

The Neoarchean StorøSupracrustal Belt in SW Greenland comprises a sequence of mature quartzite,metapelite,amphibolite,and ultramafic rocks that underwent amphibolite facies metamorphism during the amalgamation of the Mesoarchean Akia Terrane and the Eoarchean Færingehavn *** this belt,tourmaline is found in a transition zone between ultramafic and metapelitic rocks,but also occurs as orbicules within the ultramafic *** tourmaline orbicules hosted by ultramafic rocks are reported for the first time in the North Atlantic craton,thus indicating a unique formation *** conducted a comprehensive examination of the petrology,whole-rock and mineral chemistry,and oxygen isotope compositions from borehole samples in the StorøSupracrustal Belt,to elucidate the metasomatic events associated with the formation of the orbicular *** Storøultramafic rocks have high MgO,Cr,and Ni contents,with low abundances of REE and HFSE,and preserve a typical cumulate *** features are similar to those of ultramafic cumulates found in other Archean supracrustal belts,suggesting a cumulate origin for the Storøultramafic ***,the morphology and composition of the tourmaline orbicules within these cumulates indicate that they originated from melts with high boron and high water concentrations that infiltrated the ultramafic *** main factor influencing the morphology of the tourmaline orbicules is the silicification of the ultramafic rocks,driven by their lower chemical potential of SiO_(2)compared to the surrounding *** silicification process,in combination with compositional variations of cumulates during fractional crystallization,has contributed to the geochemical diversity observed in Archean ultramafic ***,it is crucial to understand the effects of such selective metasomatism on Archean ultramafic rocks,as this will facilitate the extraction of original information preserved in the early rock record.

关键词： Archean ultramafic rocks Tourmaline Metasomatism Storø Greenland

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Serpentinization,abiogenic organic compounds,and deep life

Serpentinization,abiogenic organic compounds,and deep life

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： WANG XianBin OUYANG ZiYuan ZHUO ShengGuang ZHANG MingFeng ZHENG GuoDong WANG YongLi Lanzhou Center for Oil and Gas Resources Institute of Geology and GeophysicsChinese Academy of Sciences National Astronomical Observatories Chinese Academy of Sciences Northeastern University at Qinhuangdao

The hydrocarbons and other organic compounds generated through abiogenic or inorganic processes are closely related to two science subjects,i.e.,energy resources and life’s origin and evolution."The earth’s primordial abiogenic hydrocarbon theory"and"the serpentinization of abiogenic hydrocarbon theory"are the two mainstream theories in the field of related *** generally occurs in slow expanding mid-ocean ridges and continental ophiolites tectonic environment,*** abiogenic hydrocarbons and other organic compounds formed through the serpentinization of ultramafic rocks provide energy and raw materials to support chemosynthetic microbial communities,which probably was the most important hydration reaction for the origin and early evolution of *** superposition of biological and abiological processes creates big challenge to the identification of the abiogenic organic materials in serpentinite-hosted *** abiotic(inorganic)process can form oil and gas resource is a difficult question that has been explored continuously by scientific community for more than a century but has not yet been ***,some important progress has been *** prospecting practice of abiogenic hydrocarbons in commercial gases from the Songliao Basin,China,provides an important example for exploring abiogenic natural gas resources.

关键词： ultramafic rocks serpentinization abiogenic origin organic compound origin of life

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Precise Determination of Sm and Nd Concentrations and Nd Isotopic Compositions in Highly Depleted ultramafic Reference Materials

Precise Determination of Sm and Nd Concentrations and Nd Iso...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Zhuyin Chu Jinghui Guo Yueheng Yang Liang Qi Chaofeng Li State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of Sciences

In this study,a high-precision method for the determination of Sm and Nd concentrations and Nd isotopic composition in highly depleted ultramafic rocks without a preconcentration step is *** samples were first digested using the conventional HF+HNO3+HCl O4method,followed by the complete digestion of chromite in the samples using HCl O4at 190–200°C and then complete dissolution of fluoride formed during the HF decomposition step using *** steps ensured the complete digestion of the ultramafic *** rare earth elements(REEs)were separated from the sample matrix using conventional cation-exchange chromatography;subsequently,Sm and Nd were separated using the LN *** isotopes were determined as Nd O+,whereas Sm isotopes were measured as Sm+,both with very high sensitivity using single W filaments with Ta F5as an ion *** highly depleted ultramafic rock reference materials including USGS DTS-1,DTS-2,DTS-2b,PCC-1 and GSJ JP-1,which contain extremely low amounts of Sm and Nd(down to sub ng g-1level),were analysed,and high-precision Sm and Nd concentration and Nd isotope data were *** is the first report of the Sm-Nd isotopic compositions of these ultramafic rock reference materials except for PCC-1.

关键词： ultramafic rocks sample digestion isotope dilution thermal ionisation mass spectrometry isotope ratios reference materials.

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