Scheelite U–Pb dating constraints on the timing of the formation of the Zhazixi Sb-W deposit in South China

IF 4.4 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Mineralium Deposita Pub Date : 2024-01-30 DOI:10.1007/s00126-024-01249-4

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Abstract

The Zhazixi deposit hosted in sedimentary rocks is a major Sb-W deposit in South China. The mineral scheelite, which can be dated by the U-Pb method, commonly occurs in both tungsten (W)-dominated and antimony (Sb)-dominated ore veins of the deposit. Cathodoluminescence (CL) images reveal the presence of three distinct stages of scheelite (Sch-I, Sch-II and Sch-III) within the deposit. These three scheelites were dated using in-situ laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS), yielding U-Pb ages of 158.1±5.4 Ma and 157.6 ± 4.9 Ma for Sch-I, 155 ± 11 Ma for Sch-II, and 151.3±6.1 Ma for Sch-III. These data suggest that the Zhazixi Sb-W deposit formed during the Late Jurassic (160–150 Ma) rather than the Late Triassic as previously suggested. Considering the temporal similarity with low-temperature hydrothermal Sb deposits in the Xiangzhong metallogenic province (XZMP), the formation of the Sb-W deposit may have followed a similar genetic model, where meteoric groundwater circulated to depth and extracted metals from fertile basement rocks through fluid-rock interaction, resulting in the generation of ore fluids. This study highlights that Late Jurassic low-temperature hydrothermal Sb-polymetallic mineralization in the XZMP is likely more extensive than previously perceived.

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白钨矿U-Pb年代测定对华南寨子溪Sb-W矿床形成时间的制约

摘要沉积岩中的寨子溪矿床是中国南方的一个主要锑钨矿床。该矿床以钨（W）为主的矿脉和以锑（Sb）为主的矿脉中都普遍存在可采用U-Pb法测定年代的矿物白钨矿。阴极电致发光（CL）图像显示，矿床内存在三个不同阶段的白钨矿（Sch-I、Sch-II 和 Sch-III）。利用原位激光烧蚀-电感耦合等离子体质谱法（LA-ICP-MS）对这三种白钨矿进行了年代测定，得出 Sch-I 的 U-Pb 年龄分别为 158.1±5.4 Ma 和 157.6 ± 4.9 Ma，Sch-II 为 155 ± 11 Ma，Sch-III 为 151.3±6.1 Ma。这些数据表明，寨子溪铅锌矿床形成于晚侏罗世（160-150 Ma），而非之前认为的晚三叠世。考虑到与湘中成矿省（XZMP）低温热液Sb矿床在时间上的相似性，Sb-W矿床的形成可能遵循了类似的成因模式，即陨石地下水向深部循环，通过流体-岩石相互作用从肥沃的基底岩石中提取金属，从而产生矿石流体。这项研究突出表明，XZMP 中的晚侏罗世低温热液锑多金属矿化可能比以前认为的更为广泛。

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来源期刊

Mineralium Deposita 地学-地球化学与地球物理

CiteScore

11.00

自引率

6.20%

发文量

审稿时长

6 months

期刊介绍： The journal Mineralium Deposita introduces new observations, principles, and interpretations from the field of economic geology, including nonmetallic mineral deposits, experimental and applied geochemistry, with emphasis on mineral deposits. It offers short and comprehensive articles, review papers, brief original papers, scientific discussions and news, as well as reports on meetings of importance to mineral research. The emphasis is on high-quality content and form for all articles and on international coverage of subject matter.