Lead Isotope Characteristics and Tracing Significance of Ore MetallogenicMaterial in Geza Arc Metallogenic Belt,Yunnan

Abstract

Abstract:

Geza arc is an important part of Yidun island arc in the southwest Sanjiang tectonic magmatic belts, located in the southern tip of the Yidun island arc, newly discovered copper polymetallic ore concentration area of China in recent years, in which Pulang super large sized porphyry copper deposits, Xuejiping medium sized porphyry copper deposits, Hongshan large sized skarn porphyry copper deposits occur.The lead isotopic compositions of ore mineral，with 206Pb/204Pb ranging from 17.680 to 19.165，²⁰⁷Pb/²⁰⁴Pb ranging from 15.453 to 15.773，208Pb/204Pb ranging from 37.730 to 39.654，was relatively stable and charactered by depleted uranium, rich thorium. There was a significant positive correlation between lead isotopic composition and characteristic parameters (Δβ and Δγ, V1 and V2). Based on the lead structural pattern recognition and the original classification of comprehensive analysis, the lead isotope of Geza island arc metallogenic belt is mainly derived from the mantle and the lower crust, with the crustmantle mixed source characteristics. The mineralization is closely related with magmatic activities.

Key words: arc metallogenic belt, lead isotope, metallogenic material source, Geza, Yunnan

LIU Hua-Long, LI Wen-Chang, YIN Guang-Hou. Lead Isotope Characteristics and Tracing Significance of Ore MetallogenicMaterial in Geza Arc Metallogenic Belt,Yunnan[J]. Geoscience, 2012, 26(3): 445-452.

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