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The Xianggou scheelite deposit, discovered in the Wangjiaping-Longtougou-Xiajiadian gold metallgenic belt in recent years, is another new geology survey progress in south Qinling related to W mineralization. The composition of scheelite was analyzed by LA-ICP-MS, together with Sm-Nd isotope dating of symbiotic calcite, to clarify the origin of Xianggou scheelite. The results show that scheelite exists in three generations, from the early rhythmic zonal scheelite to the late aggregate one, indicating that the scheelite undergone multiple migrations. The scheelites have high F content with low Au content. The total amount of rare earths is high, ranging from 5.44×10-6 to 382.67×10-6, with an average of 95.48×10-6. The REE pattern is flat without MREE enrichment, with negative Eu anomaly, similar to the type Ⅱ REE type classified by Ghaderi et al. (1999). All these data support that the W mineralization in the Xianggou area might be related to W-bearing quartz vein with genetic links to magmatic hydrothermal activities. The Sm-Nd isotope dating result of the symbiotic calcite (195 Ma) indicates that the deposit was formed in the late Indosinian.
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Tectonic framework of Qinling orogen(modified from Chen Yanjing, 2010; Xu Xueyi et al., 2014)
Simplified regional geological map showing distribution of metallic deposit (modified from Liu Xinwei et al., 2016)
Remote sensing interpretation of Xiangou and surrounding areas
Photographs showing the ore characteristics in the Xianggou Au deposit
Scheelite cathodoluminescence image with laser erosion cites, Xianggou Au-W deposit
Trace elements sipdier digram of scheelite from the Xianggou Au-W deposit(Standardized data from Rudnick et al., 2003)
Au-W and ΣREE+Y-Zr scatter diagram of scheelite from Xianggou Au deposit
Scheelite chondrite-normalized REE patterns(standardized data from Sun et al., 1989)
Sm-Nd isochron age of calcite from the tungsten ore bodies in Xianggou Au-W deposit
Yb/Ca-Yb/La diagram of scheelite from the Xianggou deposit
La-Ce-Y diagram of scheelite from the Xianggou deposit (base map from Zhang Yuxue et al., 1990)
LREE-MREE-HREE ternary diagram of scheelite from Xianggou and other scheelite deposits in China