Fe-Ti oxide and Fe-Cu sulfide exsolution in amphibole cumulate xenoliths from granodiorite in Tongling,Anhui Province

作     者：QINXinlong DUYangsong H.K.Lee YINJingwu GUOXifeng 

作者机构：EducationMinistryKeyLaboratoryofLithosphereTectonicsandExplorationTechnologyChinaUniversityofGeosciencesBeijing100083China DepartmentofGeologyCollegeofNaturalSciencesChungnamNationalUniversityTaejon305-764RepublicofKorea 

出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)

年 卷 期：2003年第48卷第23期

页      面：2626-2634页

核心收录：

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.40272034 and 40133020) Chinese Ministry of Science and Technology(Grant No.G1999043206) Korea Science and Engineering Foundation (Grant No.KOSEF-20005-131-03-02) 

主　　题：闪石 捕虏岩 花岗闪长岩 安徽 Fe-Ti氧化物 Fe-Cu硫化物 

摘      要：A number of Fe-Ti oxide and Fe-Cu sulfide exsolution phases are found in amphibole cumulate xenoliths from Mesozoic granodioritic plutons at Jiguanshi and Jin- kouling in Tongling, Anhui Province. Most of amphiboles in the xenoliths have been identified as pargasite, and deter-mined as a crystallization phase in the lower crust. The oxide exsolutions commonly acicular, are distributed parallel to [100] of amphibole with a typical Schiller texture. They con-tain 0.29%—51.07% of TiO2, and correspond to magnetite, titaniferous magnetite, titanomagnetite or ilmenite. All ex-solved sulfide grains, being rounded to extended rounded in shape, are regularly arranged in sub-paralleled or closely beaded groups, except for a few of grains that are scattered or isolated. The exsolved sulfide phases comprise mostly pyrrhotite, secondarily cubanite and chalcopyrite, and rarely pyrite. A few grains of magnetite can coexist with pyrrhotite in most samples. The sulfide phases are poor in nickel (usu-ally Ni 0.5%, Ni/Fe 0.003), while relative enrichments in copper (up to 2.93%) typify the pyrrhotite. Additionally, both oxides and sulfides may be exsolved in the same area of amphibole. Occurrence of Fe-Ti oxide and Fe-Cu sulfide exsolution phases in the xenoliths leads to inference that ore-forming materials such as S, Fe, Cu, etc. have been pri-marily dissolved in Mesozoic magma within the lower crust beneath the Tongling area.