Pb Isotope Geochemistry of the Jilongshan skarnhost AuCu Deposit in Hubei Province

Abstract

Abstract:

Jilongshan Au-Cu deposit is a typical skarn deposit in the southeastern Hubei metallogenic region of the MiddleLower Yangtze River Fe-Cu metallogenic belt. Few studies have been made on the ore forming material sources of this deposit. Fifteen samples were collected from the Jilongshan deposit for Pb isotope analyses. The ranges of the Pb isotopic compositions are from 17.358 to 18.589 for ²⁰⁶Pb/²⁰⁴Pb, 15.414 to 15.745 for ²⁰⁷Pb/²⁰⁴Pb and 37.956 to 39.094 for ²⁰⁸Pb/²⁰⁴Pb, which are anomalous and their single stage model ages cannot be used as a criterion for metallogenic epoch. However, the distributing characteristics of the single stage model ages suggest that the Pb of the ore derives from different sources. The linear distribution of Pb isotope in tectonic model diagram reflects the consistent relation of granodiorite porphyry, skarn, marble and ore, which is also a good proof that the ore forming materials are partly from the magma. The comparison of the Pb isotopic characteristics of Jilongshan Au-Cu deposit, Fengshandong Cu-Mo deposit, Chengmenshan Cu-Au deposit and Tonglushan Cu-Fe deposit shows that the ore forming materials of the four deposits have different characteristics in parts although they are very similar on the whole.

Key words: Pb isotope, material source, AuCu deposit, Jilongshan; , Hubei

GU Bao-Jian, LI Qing-Rong, YANG Qiang-Yu, LONG A-Juan, YANG Cheng-Dong, YAN Yo-Tong. Pb Isotope Geochemistry of the Jilongshan skarnhost AuCu Deposit in Hubei Province[J]. Geoscience, 2012, 26(3): 471-477.

References

[1]伍超群，杨洪之.鸡笼山夕卡岩型金铜矿床地球化学特征及成矿模式
[J].地质与勘探，1993，29（8）：52-57.

[2]王泽华.鄂东鸡笼山金铜矿床成矿地质特征及找矿前景分析
[J].地质与勘探，2008，44（5）：17-22.

[3]伍超群.湖北鸡笼山金铜矿床成矿物质来源探讨
[J].大地构造与成矿学，1992，16(2)：190-192.

[4]闭忠敏，杨松.鸡笼山矽卡岩金(铜)矿床地质矿产特征、物质来源及成矿机制研究
[J].矿产与地质，2008，22(6)：496-502.

[5]张乾，潘家永，邵树勋.中国某些金属矿床矿石铅来源的铅同位素诠释
[J].地球化学，2000，29(3)：231-238.

[6]Li Shengrong，Santosh M，Zhang Huafeng，et al.Inhomogeneous lithospheric thinning in the central North China Craton: Zircon UPb and SHeAr isotopic record from magmatism and metallogeny in the Taihang Mountains
[J].Gondwana Research, doi: 101016/jgr201202006.

[7]常印佛，董树文，黄德志.论中—下扬子“一盖多底”格局与演化
[J].火山地质与矿产，1994，17(1/2)：1-15.

[8]彭聪，赵一鸣.长江中下游及其邻区深部地球物理背景与含金夕卡岩矿床的分布
[J].物探与化探，1998，22(3)：175-182.

[9]陈腊春，王泽华，李朗田.湖北阳新丰山矿田矿床类型及其空间分布规律
[J].资源环境与工程，2009，23(3)：229-233.

[10]张轶男.长江中下游及其邻区重要含金(铜)夕卡岩矿床地质地球化学特征
[D].北京：中国地质科学院研究生部，1999：58-60.

[11]舒全安，陈培良，程建荣，等.鄂东铁铜矿产地
[M].北京：冶金工业出版社，1992：313-318.

[12]舒广龙.湖北丰山矿田成矿地质背景及斑岩成矿系列与微细浸染型金矿
[D].长沙：中南大学，2004：64-65.

[13]季绍新，王文斌，邢文臣，等.赣西北铜矿
[M].北京：地质出版社，1990：115-119.

[14]王彦博，顾雪祥，张宗保，等.湖北铜绿山矽卡岩型铜铁矿床同位素地球化学研究
[J].现代地质，2011，25(4)：730-739.

[15]路远发.GeoKit：一个用VBA构建的地球化学工具软件包［J］.地球化学，2004，33(5)：459-464.

[16]Zartman R E，Doe B R.Plumbotectonics—the model
[J].Tectonophysics，1981，75(1/2)：135-162.

[17]赵斌.中国主要矽卡岩及矽卡岩型矿床
[M].北京：科学出版社，1989：97-123.

[18]朱炳泉.矿石Pb同位素三维空间拓扑图解用于地球化学省与矿种区划
[J].地球化学，1993，22(3)：209-216.

[19]朱炳泉，李献华，戴橦谟，等.地球科学中同位素体系理论与应用——兼论中国大陆壳幔演化［M］.北京：科学出版社，1998：216-235.

[20]Chen Yuwei，Mao Cunxiao，Zhu Bingquan.Lead isotopic composition and genesis of Phanerozoic metal deposits in China
[J].Geochemistry，1982，1(2)：137-158.