Fluid Dynamics along the Nankai Trough: He Isotopes Reveal Direct Seafloor Mantle-Fluid Emission in the Kumano Basin (Southwest Japan),ACS Earth and Space Chemistry

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Fluid Dynamics along the Nankai Trough: He Isotopes Reveal Direct Seafloor Mantle-Fluid Emission in the Kumano Basin (Southwest Japan)
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2020-10-30 , DOI: 10.1021/acsearthspacechem.0c00229
Yama Tomonaga _{1,

2} , Kazuhiro Yagasaki ₁ , Jin-Oh Park ₁ , Juichiro Ashi ₁ , Shin Toyoda ₃ , Naoto Takahata ₁ , Yuji Sano _{1,

4}

Affiliation

We collected bottom water samples and unconsolidated sediment samples for noble-gas analysis in the water column as well as in the pore water phase along the Nankai Trough to assess the sources and fluxes of seafloor fluid emission at the local/regional scale. The results indicate that terrigenic He emission is rather variable in terms of fluxes and isotope signatures. The largest He fluxes are detected at a previously investigated cold seep site where terrigenic He is mainly of crustal origin. High He isotope ratios detected at shallower depths in the Kumano Basin indicate that mantle fluids are able to migrate from the deep sediment column up to the seafloor. Our findings are in line with the detection of mantle He in fluids recovered by IODP (International Ocean Discovery Program) deep-drilling operations and make the case that even seafloor volatile screening and monitoring might provide useful insights on the relation between fluid dynamics and tectonic/seismic activity in the investigated region for future forecasting of earthquakes.

中文翻译：

沿南海海槽的流体动力学：他的同位素揭示了熊野盆地（日本西南部）的直接海底地幔-流体排放。

我们收集了底部水样和未固结的沉积物样本，以在水柱以及沿南开海槽的孔隙水相中进行稀有气体分析，以评估局部/区域尺度海底流体排放的来源和通量。结果表明，在通量和同位素特征方面，陆源He的发射变化很大。在先前调查的冷渗漏点检测到最大的He通量，在该处，成因的He主要来自地壳。在熊野盆地较浅的深度检测到的高He同位素比表明，地幔流体能够从深部沉积物柱迁移到海底。

更新日期：2020-11-19

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