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

作　　者：JiuhuaXu YulingXie XueleiChu JianmingLiu QianMao 

机构地区：[1]CivilandEnvironmentalEngineeringSchool,UniversityofScienceandTechnologyBeijing,Beijing100083.China [2]TheResearchCenterofMineralResourcesExploration,InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beijing100029,China

出　　处：《Journal of University of Science and Technology Beijing》2005年第2期97-101,共5页北京科技大学学报（英文版）

基　　金：This study was financially supported by the National Natural Science Foundation of China (No.49972031) and the Key Laboratory of Mineral Resources of the Institute of Geology and Geophysics; Chinese Academy of Sciences.

摘　　要：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.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 

分 类 号：P585[天文地球—岩石学] P588.145[天文地球—地质学]