Cassiterite and monazite U-Pb dating, and cassiterite geochemistry of the Shiganghe and Tiechang tin deposits in the Baoshan district (NW Yunnan), SW China

IF 4.4 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Mineralium Deposita Pub Date : 2024-07-01 DOI:10.1007/s00126-024-01293-0

Dazhao Wang, Yuhang Liu, Chengbiao Leng, Shimin Zhen, Qianxin Wang, Xiaohang Song, Wenbin Jia

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Abstract

The Baoshan district in the southwestern Sanjiang Tethyan domain is an important part of the worldclass Southeast Asian tin (Sn) belt. However, the timing and controlling factors of Sn mineralization are poorly constrained. Here, we conducted laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb dating of cassiterite and monazite, and cassiterite trace element analysis on the Shiganghe and Tiechang Sn deposits (Baoshan district) to unravel the temporal evolution of the regional Sn mineralization. The U–Pb dating of two cassiterite samples from Shiganghe yielded Tera-Wasserburg lower intercept ages of 75.5 ± 3.9 Ma and 75.9 ± 4.8 Ma. U-Pb dating on cassiterite and the cogenetic monazite from Tiechang yielded 32.8 ± 1.3 Ma and 32.2 ± 1.0 Ma, respectively. These ages confirm both Late Cretaceous and Oligocene Sn mineralization events in the Baoshan district. Geological characteristics, and age and geochemical data of cassiterite indicate that Shiganghe is a quartz-vein-type Sn deposit, genetically related to the Late Cretaceous granite that intruded the Ordovician Zhibenshan pluton. Tiechang resembles distal skarn Sn deposits related to the ~ 32 Ma magmatism along the Chongshan shear zone. Tin mineralization in the Tengchong-Baoshan district occurred mainly from the Late Cretaceous to Oligocene, corresponding to the Neo-Tethyan subduction and the subsequent India–Asia continental collision.

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中国西南部保山地区（云南西北部）锡石和独居石U-Pb定年及锡石地球化学研究

三江特提岩域西南部的宝山地区是世界级东南亚锡（Sn）带的重要组成部分。然而，锡矿化的时间和控制因素却不甚明了。在此，我们对石岗河和铁厂锡矿床（保山地区）进行了锡石和独居石的激光烧蚀-电感耦合等离子体质谱（LA-ICP-MS）U-Pb定年和锡石微量元素分析，以揭示该区域锡矿化的时间演化过程。对石岗河的两个锡石样品进行了铀-铅测年，得到的 Tera-Wasserburg 下截距年龄分别为 75.5 ± 3.9 Ma 和 75.9 ± 4.8 Ma。对锡石和铁厂的同生独居石进行 U-Pb 测定，结果分别为 32.8 ± 1.3 Ma 和 32.2 ± 1.0 Ma。这些年龄证实了宝山地区晚白垩世和渐新世的锡矿化事件。锡石的地质特征、年龄和地球化学数据表明，石岗河是一个石英脉型锡矿床，在遗传学上与侵入奥陶纪志本山岩体的晚白垩世花岗岩有关。铁厂类似于与崇山剪切带沿线约 32 Ma 岩浆活动有关的远端矽卡岩型锡矿床。腾冲-保山地区的锡矿化主要发生在晚白垩世至渐新世，与新泰西俯冲和随后的印度-亚洲大陆碰撞相对应。

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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.