Time scales of multistage magma-related hydrothermal fluids at the giant Yulong porphyry Cu-Mo deposit in eastern Tibet: Insights from titanium diffusion in quartz
Time scales of multistage magma-related hydrothermal fluids at the giant Yulong porphyry Cu-Mo deposit in eastern Tibet: Insights from titanium diffusion in quartz
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西藏东部玉龙斑岩铜钼矿床多期岩浆相关热液的时间尺度：来自钛在石英中扩散的见解
DOI：
10.1016/j.oregeorev.2021.104459
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发表时间：
2021-12
影响因子：
3.3
通讯作者：
Bin Du
中科院分区：
文献类型：
--
作者：
Qi Chen;Changming Wang;Leon Bagas;Zhaochong Zhang;Bin Du
准确确定多个岩浆-热液脉冲的时间尺度是一个关键和困难的问题，它可以提供更好地约束斑岩矿床成因所需的信息。在这里，我们利用锆石U-Pb定年和扩散年代学的改进，确定了藏东玉龙斑岩铜钼矿床多期岩浆热液事件的时间尺度。新的LA-ICPMS锆石U-Pb数据表明，矿化的玉龙斑岩在约41 Ma结晶，次经济型甘龙拉岩体侵位约在41 Ma，表明同时代的岩浆作用和成矿作用。斑岩和热液脉状石英的阴极发光(CL)图像具有不同的亮度和结构，而微量元素分析表明，CL强度与石英中的钛含量密切相关。对在平衡条件下析出的石英进行了钛在石英中的分析，得到了与使用独立温度计计算的温度一致的钛离子温度。CL图像中观察到的钛梯度的锐度，加上不同石英世代的钛扩散模型，表明玉龙的大部分矿化形成于88万至16000年之间的短期内。这些数据和可用的同位素测年数据表明，矿化作用与斑岩的侵位是同时代的。复杂的多期热液网脉和较短的时间尺度揭示了玉龙地区个别岩浆和流体脉冲在数万年内迅速形成。
Accurate determination of the time scales of multiple magmatic-hydrothermal pulses is a critical and difficult problem, which can provide information needed to better constrain the genesis of porphyry deposits. Here, we take advantage of zircon U-Pb dating and improvements in the field of diffusion chronology to determine time scales of multistage magma-related hydrothermal events at the giant Yulong porphyry Cu-Mo deposit in eastern Tibet. New LA-ICP-MS zircon U-Pb data showing that the mineralised Yulong porphyry crystallised at ca. 41 Ma, with the emplacement of the subeconomic Ganlongla intrusion at ca. 41 Ma, indicating a contemporaneous magmatism and mineralisation. Quartz from porphyry and hydrothermal veins exhibits cathodoluminescence (CL) images with a variety of brightness and textures, whereas trace element analyses show that the CL intensity is strongly related to the Ti contents of quartz. The Ti-in-quartz analyses of quartz precipitated in equilibrium conditions yield TitaniQ temperatures that agree with the temperatures calculated using independent thermometers. The sharpness of the Ti gradients observed in the CL images coupled with Ti diffusion modelling for different quartz generations indicate that the bulk of the mineralisation at Yulong formed in a short period of between 880,000 and 16,000 years. These data, together with available isotopic dating data, suggest that the mineralisation is coeval with the emplacement of the porphyries. Complex multi-stage hydrothermal stockwork veins and shorter time scales reveal that the individual magma and fluid pulses at Yulong formed rapidly within tens of thousands of years.
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影响因子：
3.5
作者：
L. Zhang;Di‐Cheng Zhu;Qing Wang;Zhidan Zhao;Dong Liu;Jin‐Cheng Xie
通讯作者：
L. Zhang;Di‐Cheng Zhu;Qing Wang;Zhidan Zhao;Dong Liu;Jin‐Cheng Xie
影响因子：
4.6
作者：
Chelle-Michou C;Rottier B;Caricchi L;Simpson G
通讯作者：
Simpson G
影响因子：
5
作者：
Huang, Ruifang;Audetat, Andreas
通讯作者：
Audetat, Andreas
西藏青海南部纳日贡马碰撞后斑岩铜钼矿床地质及成因
影响因子：
6.1
作者：
Yang, Zhusen;Tian, Shihong;Liu, Yingchao;Wang, Zhaolin
通讯作者：
Wang, Zhaolin
影响因子：
5.8
作者：
Wei Mao;B. Rusk;Fuchun Yang;Mingji Zhang
通讯作者：
Wei Mao;B. Rusk;Fuchun Yang;Mingji Zhang