Decoupling of Sn and W mineralization in a highly fractionated reduced granitic magma province: a case study from the Youjiang basin and Jiangnan tungsten belt
Decoupling of Sn and W mineralization in a highly fractionated reduced granitic magma province: a case study from the Youjiang basin and Jiangnan tungsten belt
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高分异还原花岗质岩浆省锡、钨矿化解耦——以右江盆地和江南钨矿带为例
DOI：
10.1007/s00126-022-01094-3
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发表时间：
2022-03
影响因子：
4.8
通讯作者：
Wei Jian
中科院分区：
文献类型：
--
作者：
Shiwei Song;Jingwen Mao;Shunda Yuan;Wei Jian
研究了中国南方右江盆地与矿有关的锡花岗岩（YJB; ~ 4.0 Mt Sn）和江南钨带的钨花岗岩（JNB; ~ 6.0 Mt WO 3），以解释区域尺度上Sn或W是否最可能与高度分馏的还原花岗岩岩浆有关的控制。与锡、钨成矿有关的岩浆均来自于变质沉积岩的部分熔融。虽然Sn和W在分离结晶过程中表现相似，因此在高度演化的还原花岗岩中富集，但Sn为主的系统和W为主的系统之间通常有明显的区别。例如，YJB拥有世界级的锡矿床，缺乏伴随的经济W，而JNB拥有世界级的还原W矿床，缺乏伴随的经济Sn。这种差异可能与源熔融的条件，使W被动员到初始花岗质岩浆时，发生在较低的温度下的部分熔融的变质沉积岩，而熔体，在较高的温度下形成可能有较高的Sn浓度。后者具有较低的W浓度，因为W已经失去了在较低的温度熔融事件。从这项研究的结果表明，在JNB的W有关的花岗岩来自于变质沉积岩，从来没有经历过高级变质或熔融的前一幕。熔体富W贫Sn，经广泛分离结晶形成纯W矿石。与此相反，花岗岩在YJB来自熔融的变质沉积岩，经历了高级变质或熔融，并形成了锡只有矿石后，广泛的分离结晶。
The ore-related Sn granites in the Youjiang basin (YJB; ~ 4.0 Mt Sn) and W granites in the Jiangnan tungsten belt (JNB; ~ 6.0 Mt WO3) in south China were studied to decipher regional-scale controls on whether Sn or W is most likely to be associated with highly fractionated reduced granitic magmas. Both Sn and W mineralization-related magmas were derived from partial melting of metasedimentary rocks. Although Sn and W behave similarly during fractional crystallization and therefore become enriched in highly evolved reduced granites, there is commonly a clear distinction between Sn-dominated and W-dominated systems. For example, the YJB hosts world-class Sn deposits that lack accompanying economic W, whereas the JNB hosts world-class reduced W deposits that lack accompanying economic Sn. This difference may be related to conditions of source melting, such that W is mobilized into initial granitic magmas when partial melting of metasedimentary rocks occurs at lower temperature, whereas melts that form at higher temperature may have higher Sn concentrations. The later have low W concentrations because W has already been lost at the lower temperature melting event.Results from this study reveal that the W-related granites in the JNB were derived from metasedimentary rocks that had never experienced a previous episode of high-grade metamorphism or melting. The melts were enriched in W but depleted in Sn and formed W-only ores after extensive fractional crystallization. In contrast, the granites in the YJB were derived from melting of metasedimentary rocks that had undergone previous episodes of high-grade metamorphism or melting and formed Sn-only ores after extensive fractional crystallization.
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影响因子：
3
作者：
Zhi-Yong Zhu;Shaoyong Jiang;Jian Hu;L. Gu;Jian-wei Li
通讯作者：
Zhi-Yong Zhu;Shaoyong Jiang;Jian Hu;L. Gu;Jian-wei Li
DOI：
10.1016/c2009-0-12435-2
发表时间：
1987
期刊：
--
影响因子：
--
作者：
T. A. Kwak
通讯作者：
T. A. Kwak
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影响因子：
3.3
作者：
Tuan Anh Nguyen;Yang Xiaoyong;Hien Vu Thi;Liu Lei;Lee Insung
通讯作者：
Lee Insung
影响因子：
2.7
作者：
J. Stimac;A. H. Clark;Yanshao Chen;S. Garcia
通讯作者：
J. Stimac;A. H. Clark;Yanshao Chen;S. Garcia
华南地块西南部大厂—昆仑关矿带晚白垩世I型、S型花岗岩岩石成因及成矿意义
影响因子：
3.3
作者：
Wang Tingyi;Li Gongjian;Wang Qingfei;Santosh M;Zhan Qizuan;Deng Jun
通讯作者：
Deng Jun