Miocene Pb-Zn Mineralization in the Eastern Gangdese Metallogenic Belt: Evidence from in situ Rb-Sr Dating of Mica and Trace Element Geochemistry of Sphalerite

IF 3.5 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Xiaoyan ZHAO, Zhusen YANG, Chang LIU, Yanrui DONG, Haiyan SHI
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Abstract

Four Pb-Zn deposits, namely Bangpu (BP), Digei (DG), Nabuding (NB) and Cuoga (CG), are located within a 20 km distance of each other in the Gangdese porphyry copper belt (GPCB). The age and nature of the Pb-Zn mineralization, especially its relationship to magmatism, remain uncertain. In order to address this issue, mica from the four deposits was selected for in situ Rb-Sr dating, with sphalerite additionally being selected for in situ trace element analysis. Detailed geological research has revealed that the BP and NB deposits are primarily skarn-type Pb-Zn mineralization, while DG and CG are associated with magmatic hydrothermal breccia and are characterized by banded-type mineralization. The Rb-Sr isochron ages of syn-mineralization muscovite at the BP and CG deposits are 11 ± 6 Ma and 19.7 ± 0.7 Ma respectively. Fe, Cd, In, Mn and Sn occur as lattice substitutions in sphalerite from the four deposits. Cu exists as microinclusions in BP, but occurs isomorphically in the DG, NB and CG deposits. The formation temperatures of the four deposits, as calculated from sphalerite geothermometry, range from approximately 200°C to 300°C, indicating that they belong to medium temperature deposits. BP and NB are classified as skarn Pb-Zn deposits, while DG and CG are categorized as hydrothermal filled Pb-Zn deposits. These results suggest that, in addition to porphyry Cu mineralization, the GPCB also contains significant Miocene Pb-Zn mineralization.

冈底斯成矿带东部中新世铅锌成矿作用:云母原位Rb-Sr定年及闪锌矿微量元素地球化学证据
在冈底斯斑岩铜带(GPCB)中,邦堡(BP)、迪盖(DG)、那定(NB)和果嘎(CG) 4个铅锌矿床彼此相距不到20公里。铅锌矿化的年龄和性质,特别是与岩浆作用的关系仍不确定。为了解决这一问题,从四个矿床中选择云母进行原位Rb-Sr测年,并选择闪锌矿进行原位微量元素分析。详细的地质研究表明,BP和NB矿床主要为矽卡岩型铅锌矿化,而DG和CG矿床与岩浆热液角砾岩伴生,具有带状矿化特征。BP和CG矿床同成矿白云母的Rb-Sr等时线年龄分别为11±6 Ma和19.7±0.7 Ma。Fe, Cd, In, Mn和Sn以晶格取代形式出现在四个矿床的闪锌矿中。铜在BP中以微包裹体形式存在,而在DG、NB和CG矿床中以同构形式存在。根据闪锌矿地热测量结果,4个矿床的形成温度在200 ~ 300℃之间,属于中温矿床。BP和NB为矽卡岩型铅锌矿床,DG和CG为热液充填型铅锌矿床。这些结果表明,GPCB除斑岩型铜矿化外,还存在明显的中新世铅锌成矿作用。
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来源期刊
Acta Geologica Sinica ‐ English Edition
Acta Geologica Sinica ‐ English Edition 地学-地球科学综合
CiteScore
3.00
自引率
12.10%
发文量
3039
审稿时长
6 months
期刊介绍: Acta Geologica Sinica mainly reports the latest and most important achievements in the theoretical and basic research in geological sciences, together with new technologies, in China. Papers published involve various aspects of research concerning geosciences and related disciplines, such as stratigraphy, palaeontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration.
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