Cathodoluminescence and Trace Element Composition of Scheelite from the Middle‐Lower Yangtze River Metallogenic Belt (MLYB): Implications for Mineralization and Exploration,Acta Geologica Sinica-English Edition

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Cathodoluminescence and Trace Element Composition of Scheelite from the Middle‐Lower Yangtze River Metallogenic Belt (MLYB): Implications for Mineralization and Exploration
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2020-12-16 , DOI: 10.1111/1755-6724.14609
Liqing NIE _{1,

2,

3} , Taofa ZHOU _{1,

3} , Xuefeng CHEN _{1,

3} , Fangyue WANG _{1,

3} , Xin XIAO _{1,

3}

Affiliation

The Middle–Lower Yangtze River Metallogenic Belt (MLYB) is known to contain abundant copper and iron porphyry‐skarn deposits, with an increasing number of tungsten deposits and scheelite in Fe–Cu deposits being discovered in the MLYB during recent decades. The ore genesis of the newly‐discovered tungsten mineralization in the MLYB is poorly understood. We investigate four sets of scheelite samples from tungsten, iron and copper deposits, using CL imaging and LA–ICP–MS techniques to reveal internal zonation patterns and trace element compositions. The REE distribution patterns of four studied deposits show varying degrees of LREE enrichment with negative Eu anomalies. The oxygen fugacity of ore‐forming fluid increased in Donggushan, while the oxygen fugacity of ore‐forming fluid decreased in Ruanjiawan, Guilinzheng and Gaojiabang. The scheelites from the Donggushan, Ruanjiawan, Guilinzheng and Gaojiabang deposits show enrichment in LREEs and HFSE, with Nb/La ratios ranging from 1.217 to 52.455, indicating that the four tungsten deposits are enriched in the volatile fluorine. A plot of (La/Lu)_N versus Mo/δEu can be used to distinguish quartz vein type, porphyry and skarn tungsten deposits. This study demonstrates that scheelite grains can be used to infer tungsten mineralization and are effective in identifying magmatic types of tungsten deposits in prospective mining sites.

中文翻译：

长江中下游成矿带白钨矿的阴极发光和微量元素组成：对成矿作用和勘探意义

长江中下游成矿带（MLYB）含有丰富的铜和铁斑岩-矽卡岩矿床，近几十年来，在MLYB中发现了越来越多的钨铜矿床和白钨矿。人们对MLYB中新发现的钨矿化的成因了解甚少。我们使用CL成像和LA-ICP-MS技术研究了四套来自钨，铁和铜矿的白钨矿样品，以揭示内部分区模式和微量元素组成。四个研究矿床的REE分布模式显示了不同程度的LREE富集，负Eu异常。东姑山成矿流体的氧逸度增加，阮家湾，桂林正和高家帮的成矿流体氧逸度下降。东鼓山，阮家湾，桂林正和高家bang矿床的闪锌矿在LREEs和HFSE中富集，Nb / La比在1.217至52.455之间，表明这四个钨矿床都富含挥发性氟。情节（La / Lu）_N与Mo /δEu的关系可用于区分石英脉类型，斑岩和矽卡岩型钨矿床。这项研究表明，白钨矿颗粒可用于推断钨矿化作用，并能有效地识别预期采矿场所钨矿床的岩浆类型。

更新日期：2020-12-29

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