Discovery of Pyrrhotite-Chalcopyrite Bearing Amphibole Megacrysts in Tongling Area, Anhui Province

作     者：QinXinlong DuYangsong TianShihong H.K.Lee YinJingwu S.J.Kim 

作者机构：Key Laboratory of Lithospheric Tectonics and Lithoprobing TechnologyChina University of GeosciencesMinistry of EducationBeijing100083China Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing100037China Department of GeologyCollege of Nature ScienceChungnam National UniversityTaejon305764Republic of Korea 

出 版 物：《Journal of China University of Geosciences》 (中国地质大学学报（英文版）)

年 卷 期：2004年第15卷第1期

页      面：36-45页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：ThispaperissupportedbytheNationalNaturalScienceFoundationofChina(Nos.40 2 72 0 34and 40 1 330 2 0 )  KeyProgramofScienceandTechnologyRe search  MinistryofEducation (No .0 31 78)andKoreaScienceandEngineeringFund (No.KOSEF 2 0 0 0 5 1 31 0 3 0 2 ) 

主　　题：amphibole megacrysts pyrrhotite-chalcopyrite Tongling Anhui Province. 

摘      要：Some pyrrhotite-chalcopyrite-bearing amphibole megacrysts (including pyroxene megacrysts) were discovered in Mesozoic augite diorite-porphyrite at Caoshan in Tongling area, Anhui Province. The amphibole megacrysts,belonging mainly to pargasite and magnesiohastingsite, are characteristic of the amphibole composition derived from mantle and crystallized in lower crust. In general, the aggregates of pyrrhotite-chalcopyrite take the shapes of cylinder and sphere. Three occurrences have been recognized in the amphibole megacrysts: parallel linear, bunchy and scattered. The unique cylinder-like shape of the aggregates and remarkable Ni-poor sulfides in Caoshan are distinctively different from the spherical Ni-rich sulfides in pyroxene megacrysts and any other kinds of megacrysts. In terms of composition, the amphibole megacrysts and their sulfides in Caoshan are similar to those in the pyroxenite xenoliths in Qilin, Guangdong Province. In terms of origin, the pyrrhotite-chalcopyrites as exsolution products resulted from the subsolidus re-equilibration of sulfide solid solution within amphibole megacrysts. Such pyrrhotite-chalcopyrite-bearing amphibole megacrysts were first discovered inside and outside China. This discovery is important for the study of regional magma evolution and its associated mineralizations and ore sources as well.