Crustal Structure and its Control on Gold Mineralization in Wulong Goldfield, Liaodong Peninsula of China: Constraints from Ambient Noise Tomography with a Short-Period Dense Array

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS pure and applied geophysics Pub Date : 2024-08-28 DOI:10.1007/s00024-024-03554-5
Tingwei Yang, Tao Xu, Yinshuang Ai, Qingdong Zeng, Jinhui Yang, Laicheng Miao, Fan Zheng, Nanqiao Du
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Abstract

During the destruction of the North China Craton in the Mesozoic era, a significant gold mineralization event occurred, leading to the formation of the world-renowned Jiaodong Gold Province. The Liaodong and Jiaodong regions have similar tectonic backgrounds and geological evolution histories. However, the confirmed gold resources in the Liaodong region are only one-tenth of those in Jiaodong. To reveal the controlling factors behind the differences in mineralization between these two regions and explore the deep mineralization prospects in the Liaodong region, we conducted a short-period and high-density array (WSP array) in the Wulong Gold Concentrated Area, the largest goldfield in the Liaodong region. Using data recorded by 334 SmartSolo seismometers for one month, we applied ambient noise tomography to obtain the S-wave velocity structure of the crust down to a depth of 3.5 km beneath the Wulong goldfield. The velocity structure revealed the presence of two sets of low-velocity anomalies trending NNE and NW, respectively, in the shallow crust (shallower than 1.5 km) of the Wulong goldfield, while two high-velocity anomalies were identified at deeper depths (1.5–3.5 km). By combining these findings with the geological characteristics of the Wulong goldfield, it was discovered that the high-velocity anomaly (II) corresponds to the Sanguliu granitic body exposed at the surface, while the high-velocity anomaly (I) could be a concealed intrusive body. The shallow low-velocity anomalies are the result of hydrothermal alteration caused by mineralizing fluids along the NNE- and NW-trending faults. The intersection of these two sets of faults, where the low-velocity anomalies exist, represents the center of the hydrothermal activities. Based on these observations, it is proposed that the area between the Sanguliu granitic body and the concealed intrusive body in the northwest has favorable metallogenic conditions. The intersections of the NNE- and NW-trending faults show the high potential for forming large to super-large altered rock-type gold deposits.

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中国辽东半岛乌龙金矿区的地壳结构及其对金成矿作用的控制:使用短周期密集阵列进行环境噪声层析成像的制约因素
在中生代华北克拉通的破坏过程中,发生了重大的金矿化事件,形成了举世闻名的胶东金省。辽东和胶东地区有着相似的构造背景和地质演化历史。然而,辽东地区已探明的黄金资源量仅为胶东地区的十分之一。为了揭示两地成矿差异背后的控制因素,探索辽东地区深部成矿前景,我们在辽东地区最大的金矿区--五龙金矿集中区进行了短周期高密度阵列(WSP 阵列)研究。利用 334 台 SmartSolo 地震仪一个月的记录数据,我们采用环境噪声层析技术获得了乌龙金矿区地下 3.5 千米深处的地壳 S 波速度结构。速度结构显示,在武隆金矿区的浅层地壳(浅于 1.5 千米)存在两组分别呈 NNE 和 NW 走向的低速异常,而在较深的地壳(1.5-3.5 千米)则发现了两组高速异常。将这些发现与武隆金矿区的地质特征相结合,发现高速异常(II)与暴露在地表的桑古柳花岗岩体相对应,而高速异常(I)可能是一个隐蔽的侵入体。浅层低速异常是矿化流体沿 NNE 和 NW 走向断层造成热液蚀变的结果。这两组断层的交汇处存在低速异常,是热液活动的中心。根据这些观察结果,建议在西北部的桑古柳花岗岩体和隐藏的侵入体之间的区域具有有利的成矿条件。NNE 和 NW 走向断层的交汇处显示出形成大型至超大型蚀变岩型金矿床的巨大潜力。
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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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