Source Enrichment Control on the Scale of Magmatic-Hydrothermal W-Sn Mineralization:Insights from Triassic and Jurassic Magma Reservoirs in the Continental Crust,Xitian,South China  

作　　者：GUO Chunli Simon AWILDE Coralie SIEGEL CHEN Zhenyu WU Shichong 

机构地区：[1]MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China [2]SinoProbe Laboratory,Chinese Academy of Geological Sciences,Beijing 100094,China [3]School of Earth and Planetary Sciences,Curtin University,Perth 6845,Australia [4]Discovery Program,Mineral Resources,Commonwealth Scientific and Industrial Research Organisation,Australian Resources Research Centre,Perth 6151,Australia [5]No.416 Geological Group,Hunan Bureau of Mineral Exploration and Development,Zhuzhou,Hunan 412007,China

出　　处：《Acta Geologica Sinica(English Edition)》2024年第1期132-149,共18页地质学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.92162210,42172096 and 41773028).

摘　　要：There are two factors,source composition and magmatic differentiation,potentially controlling W-Sn mineralization.Which one is more important is widely debated and may need to be determined for each individual deposit.The Xitian granite batholith located in South China is a natural laboratory for investigating the above problem.It consists essentially of two separate components,formed in the Triassic at ca.226 Ma and Jurassic at ca.152 Ma,respectively.The Triassic and Jurassic rocks are both composed of porphyritic and fine-grained phases.The latter resulted from highlydifferentiated porphyritic ones but they have similar textural characteristics and mineral assemblages,indicating that they reached a similar degree of crystal fractionation.Although both fine-grained phases are highly differentiated with elevated rare metal contents,economic W–Sn mineralization is rare in the Triassic granitoids and this can be attributed to less fertile source materials than their Jurassic counterparts,with a slightly more enriched isotopic signature and whole-rockεNd(226 Ma)of−10.4 to−9.2(2σ=0.2)compared withεNd(152 Ma)of−9.2 to−8.2(2σ=0.2)for the Jurassic rocks.The initial W-Sn enrichment was derived from the metasedimentary rocks and strongly enhanced by reworking of the continental crust,culminating in the Jurassic.

关 键 词：W-Sn mineralization magma reservoir geometry crystal fractionation Xitian Triassic-Jurassic granitic batholith Nanling Range South China 

分 类 号：P618.67[天文地球—矿床学] P618.44[天文地球—地质学]