Chen Ai-Ti, Shen Chuan-Chou, Byrne Timothy B, Sano Yuji, Takahata Naoto, Yang Tsanyao Frank, Wang Yunshuen
High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei, 10617, Taiwan, ROC.
Research Center for Future Earth, National Taiwan University, Taipei, 10617, Taiwan, ROC.
Sci Rep. 2019 Jul 25;9(1):10805. doi: 10.1038/s41598-019-47070-2.
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.
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。该断层系统分隔了增生的大陆物质的区域尺度地块。尽管处于大陆环境，但同位素特征表明存在地幔衍生流体，这表明该活动断层系统是深部的。这与在同一地区识别出的深部非火山性震颤一致。我们推测地幔流体正沿着一条地壳尺度的断层逸出，该断层由中南部山脉正下方的非火山性震颤群所标记。这些震颤以及先前识别出的沿断层走向的电导率异常向上倾与一条主要活动断层的地表痕迹相关的证据支持了这一假说。
