Geochronology and textural and compositional complexity of apatite from the mineralization-related granites in the world-class Zhuxi W-Cu skarn deposit: A record of magma evolution and W enrichment in the magmatic system
Geochronology and textural and compositional complexity of apatite from the mineralization-related granites in the world-class Zhuxi W-Cu skarn deposit: A record of magma evolution and W enrichment in the magmatic system
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世界级朱溪钨铜矽卡岩矿床成矿相关花岗岩中磷灰石的年代学及结构和成分复杂性：岩浆系统中岩浆演化和钨富集的记录
DOI：
10.1016/j.oregeorev.2020.103885
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发表时间：
2020-11
影响因子：
3.3
通讯作者：
Di Zhang
中科院分区：
文献类型：
--
作者：
Wei Zhang;Shao-Yong Jiang;Ouyang Yongpeng;Di Zhang
磷灰石是花岗岩中普遍存在的一种矿物，它从岩浆演化的开始阶段结晶到最后的岩浆-流体过渡阶段，因此能够记录成岩-成矿信息。为探讨花岗岩在朱溪存款形成中的作用，对朱溪花岗岩中磷灰石的结构和成分进行了研究。与竹溪钨铜存款有关的花岗岩包括黑云母花岗岩、白云母花岗岩和花岗斑岩。这些花岗岩中的磷灰石分别被命名为A组、B组（核-B1组;边缘-B2组）和C组。沿着这一序列，磷灰石的地球化学特征表现为全稀土元素（REE）、高场强元素（HFSE; Th、U、Nb、Ta、Zr和Hf）以及成矿元素W逐渐富集，Sr逐渐亏损，同时，磷灰石中Ga含量不断增加，表明珠西岩浆体系中氧逸度降低。C组磷灰石中的Y/Ho（大多数> 34）和Zr/Hf（大部分< 5）反映了与最演化的花岗斑岩的岩浆相互作用的大量流体。磷灰石样品中F含量较高（3.4- 4.4wt%），表明朱溪岩浆中F含量丰富，F对朱溪存款的形成起了重要作用，促进了岩浆中W的富集和W向热液中的出溶。竹溪花岗岩形成于约1000年。153 Ma时华南地块处于伸展构造环境，花岗斑岩是最有可能导致竹溪存款成矿的侵入体。
Apatite is a ubiquitous mineral in granites and crystallizes from the beginning of magma evolution to the latest magma-fluids transitional stage, and thus, is able to record petrogenetic-metallogenic information. In order to figure out the role of granites in the formation of the Zhuxi deposit, textures and compositions of apatites in the Zhuxi granites were investigated. Granites related to the Zhuxi W-Cu deposit include biotite granite, muscovite granite, and granite porphyry. Apatites in these granites are named Group A, Group B (core – Group B1; rim – Group B2), and Group C, respectively. Along this sequence, geochemical characteristics of apatites show gradual enrichment of total rare earth elements (ΣREE), high-field strength elements (HFSE; Th, U, Nb, Ta, Zr, and Hf), as well as ore-forming element W, and depletion of Sr. Meanwhile, Ga content in these apatites consecutively increased, indicating the reduction of oxygen fugacity in the Zhuxi magmatic system. Non-chondritic Y/Ho (mostly > 34) and Zr/Hf (broadly < 5) ratios in Group C apatite reflect the high volume of fluids interacted with the magma of the most evolved granite porphyry. Constant high F contents (3.4–4.4 wt%) in all apatite samples show abundant F in the Zhuxi magmas, which played an important role in the formation of the Zhuxi deposit in terms of facilitating W enrichment in magma and exsolution of W into hydrothermal fluids. The Zhuxi granites formed at ca. 153 Ma when South China Block was in an extensional tectonic setting, and the granite porphyry is the most potential intrusion to cause the mineralization of the Zhuxi deposit.
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