Mantle fluids associated with crustal-scale faulting in a continental subduction setting, Taiwan

Mantle fluids associated with crustal-scale faulting in a continental subduction setting, Taiwan
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台湾大陆俯冲环境中与地壳尺度断层相关的地幔流体

DOI:
10.1038/s41598-019-47070-2
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发表时间:
2019
期刊:
影响因子:
4.6
通讯作者:
Wang, Yunshuen
Wang, Yunshuen
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Chen, Ai-Ti;Shen, Chuan-Chou;Byrne, Timothy B.;Sano, Yuji;Takahata, Naoto;Yang, Tsanyao Frank;Wang, Yunshuen

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我们报告了来自台湾南部一个主要断层系统的地下水、温泉和基岩样本的稀有气体特征,该断层系统将台湾南部的区域规模的增生大陆物质块分开。尽管处于大陆背景,但同位素特征表明存在地幔衍生流体,这表明活动断层系统是深层的。这与在同一地区发现的深层非火山地震一致。我们推测,地幔流体正在沿着地壳尺度的断层逸出,该断层以中央山脉南部正下方的非火山震颤簇为标志。先前发现的沿断层走向的这些震动和电导率异常的证据与主要活动断层的表面痕迹相关,支持了这一假设。
We report noble gas signatures of groundwater, hot springs, and bedrock samples from a major fault system that separates regional-scale blocks of accreted, continental materials in southern Taiwan. Despite the continental setting, the isotopic signatures argue for the presence of mantle derived fluids, suggesting that the active fault system is deep-seated. This is consistent with deep, non-volcanic tremors identified in the same area. We speculate that the mantle fluids are escaping along a crustal-scale fault marked by clusters of non-volcanic tremors directly beneath the southern Central Range. The evidence of these tremors and electrical conductivity anomalies along the strike of the fault recognized previously correlated up dip with the surface trace of a major active fault support the hypothesis.
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