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Sulfide assemblages in granulite xenoliths from Hannuoba Basalt, Hebei Province, China

Journal of University of Science and Technology Beijing 2005年第2期12卷 97-101页

作者： JiuhuaXu YulingXie XueleiChu JianmingLiu QianMao CivilandEnvironmentalEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083.China theresearchcenterofmineralresourcesexploration InstituteofGeologyandGeophysicsChineseAcademyofSciencesBeijing100029China

Granulite xenoliths are important samples for understanding the forming and evolution of the crust. The granulite xeno- liths enclosed in Cenozoic basalt of Hannuoba, Hebei Province, China, contain four types of sulfide assemblages: isolate rotundity enclosed sulfides, intergranular sulfides between minerals, secondary sulfide inclusions ranging in linear, and fissure-filling sulfides. Electron microprobe analysis shows that the components of sulfides are Ni-poor pyrrhotite with the molar ratios of (Ni+Co+Cu)/Fe less than 0.2. The molar ratios of (Fe+Cu+Co+Ni)/S are less than 0.875 of normal pyrrhotite, and are less than those of mantle xeno- liths, reflecting a sulfur-saturated environment. Pyrrhotite in various occurrences contains some Au and Ag, with the averages of 0.19wt%-0.22wt% Au and 0.01wt%-0.02wt% Ag, showing the gold mineralization related to the granulitization of low crust. Ni, Co and Cu have a normal correlation with S in pyrrhotite, indicating that heavy metal elements have a same source similar to sulfur be- cause of the degasification of upper mantle.

关键词： granulite: xenolith sulfide inclusions Hannuoba

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Rare earth elements in CO_2-fluid inclusions in mantle Iherzolite

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Journal of University of Science and Technology Beijing 2003年第3期10卷 8-12页

作者： JiuhuaXu YulingXie LijunWang HepingZhu LiquanWang DepartmentofResourceEngineering UniversityofScienceandTechnologyBeijingBeijing100083China theresearchcenterofmineralresourcesexploration InstituteofGeologyandGeophysicsChineseAcademyofSciencesBeijing100101China

Trace elements including REE (Rare Earth Elements) in fluid inclusions inlherzolite, olivine, orthopyroxene, and clinopyroxene have been determined by heating-decrepitationand ICP-MS (Element Type Inductively Coupled Plasma-Mass Spectrometry) method. Normalized CO_2fluid/chondrite data show that mantle fluids are rich in REEs, especially LREEs (Light Rare EarthElements), several times or dozen times higher than mantle rocks and mantle minerals. There areclose relationships among the REE data of olivine, orthopyroxene, clinopyroxene and *** to the data of chemical dissolution method, it is believed that REE data obtained fromheating-decrepitation and ICP-MS technique are contributed by CO_2 fluid inclusions. About 60percent (mass fraction) of tiny inclusions are observed not to be decrepitated above 1000 deg C, soREE data obtained are only contributed by decrepitated inclusions. Mantle fluids rich in LREE playan important role in mantle metasomatism, partial melting and mineralization.

关键词： rare earth elements fluid inclusions ICP-MS mantle lherzolite

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Reef coral δ^(18)O thermometer in Hainan island waters,South China Sea

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Nuclear Science and Techniques 2000年第3期11卷 162-166页

作者： HEXue-Xian HUOWei-Guo DepartmentofEarthandSpaceSciences UniversityofScienceandTechnologyofChinaHefei230026 theresearchcenterofmineralresourcesexploration TheChineseAcademyofSciencesBejing100101

An 18--year-long (1981-1998) study was conducted in Hainan Island waters (22°20’N, 110°39’E) to determine the relationship between 618O in skeletal aragonite carbonate and sea surface temperature (SST) in porites lutea of reef-building corals. 618O values in skeletal aragonite carbonate were measured by means of mass spectrometry. Coral samples grew at sin depth at Longwan Bay. Monthly measurements of the SST from 1960 to 1998 were taken at Qinglan Buy adjacent to the place of the collected samples. The thermometer shows that SST=-4.16 б~18O_PDB + 4.9 (r=0.80) and dб~18O/dT=-0.24 permil/°C. The б~18O thermometer is strongly influenced by the rainfall and runoff. Using the thermometer, the SST in the past hundred years with monthly resolution will be reconstructed and the climatic change in the northern area of South China Sea will be

关键词：南中国海海南岛质谱温度计海水表面温度氧18 海洋地球化学氧同位素珊瑚

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