Nitrogen isotope and content record of Mesozoic orogenic gold deposits surrounding the North China craton  

作　　者：毛景文 张作衡 王义天 贾叶飞 Robert Kerrich 

机构地区：[1]Faculty of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China [2]Institute of Mineral Deposits,Chinese Academy of Geological Sciences,Beijing 100037,China [3]Department of Geological Sciences,University of Saskatchewan,Saskatoon,SK S7N 5E2,Canada

出　　处：《Science China Earth Sciences》2003年第3期231-245,共15页中国科学（地球科学英文版）

基　　金：This work was supported by the Ministry of Science and Technology of China (Grant No. G1999043211).

摘　　要：As an effective tracer, nitrogen isotopes have been used to determine the source of ore materials in recent years. In this study, the nitrogen isotopes and contents were measured on K-feldspar and sericite of gold deposits and some related granitic intrusions in Jiaodong, Xiao-qinling-Xiong’ershan, west Qinling, the west part of North Qilian and the Zhangjiakou-Xuanhua district around the North China craton (NCC). Although the gold deposits around the NCC are hosted in Precambrian metamorphic rocks, Phanerozoic sedimentary rocks, mafic volcanic rocks or granite, comparison of which with the nitrogen contents and isotope data of previous studies on mantle-derived rocks, granites, metamorphic rocks and gold deposits indicates that those deposits are closely related to granitic rocks. In addition, mantle-derived materials may have been involved in the ore-forming processes to a certain degree. This conclusion is consistent with the result of previous hydrogen, oxygen and carbon isotopic studies of those gold deposits.As an effective tracer, nitrogen isotopes have been used to determine the source of ore materials in recent years. In this study, the nitrogen isotopes and contents were measured on K- feldspar and sericite of gold deposits and some related granitic intrusions in Jiaodong, Xiao-qinling-Xiong抏rshan, west Qinling, the west part of North Qilian and the Zhangjiakou-Xuanhua district around the North China craton (NCC). Although the gold deposits around the NCC are hosted in Precambrian metamorphic rocks, Phanerozoic sedimentary rocks, mafic volcanic rocks or granite, comparison of which with the nitrogen contents and isotope data of previous studies on mantle-derived rocks, granites, metamorphic rocks and gold deposits indicates that those deposits are closely related to granitic rocks. In addition, mantle-derived materials may have been involved in the ore-forming processes to a certain degree. This conclusion is consistent with the result of previous hydrogen, oxygen and carbon isotopic studies of those gold deposits.

关 键 词：NITROGEN isotope  NITROGEN content  gold deposit  MARGINS of the North China craton. 

分 类 号：P597[天文地球—地球化学]