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The chronological data obtained by a variety of dating methods have confirmed that the sodium enriched metavolcanite series
in the area of the Longbohe copper deposit at Jinping, Yunnan Province, was formed during the Proterozoic (its Pb−Pb isochron
age=1595±75 Ma), corresponding to the Dahongshan Group sodium enriched metavolcanites. The Sm−Nd isochron age of 1336±46Ma
should represent the time at which this series of volcanic rocks experienced spilitization in response to sodium metasomatism,
equivalent to the time of sedimentation of the Ailaoshan Group and Yashan Group rocks. The Rb−Sr ages of the volcanic rocks
and the Pb−Pb ages of copper ores have recorded the events of strong dynamic metamorphism and of strong reworking-metallogenesis
of copper during the Jinningian period. Similarities in forming age, rock assemblage and isotopic characteristics between
the sodium enriched metavolcanite series and the Dahongshan Group sodium enriched metavolcanite series have provided new clues
to the exploration of the Dahongshan-type copper deposits in this area.
Granted jointly by the National Natural Science Foundation of China (Nos. 49702022, 40073001) and the State 973 Program (No.
G1999043215). 相似文献
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滇东南海相火山岩型铜矿系统研究程度较低, 找矿潜力较大。区内3个典型铜矿床地质特征及地球化学研究表明, 它们均为与海相火山岩有关的火山沉积改造型铜矿床。矿体受地层层位控制, 与中三叠世含矿变基性火山岩系关系密切。同时, 矿体受后期构造和热液改造, 经历了强烈的变质作用, 矿区侵入岩可能为矿体的二次富集提供了热液和物质来源。3个矿区的火山岩具有共性, 都具备成为矿源层的条件, 但成岩微构造环境有一定差异。区内找矿潜力较大, 在加强深部找矿的同时, 应重视火山岩的系统综合研究, 以选定新靶区。 相似文献
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