Recognition of broad thermal anomaly around the median tectonic line in central Kii peninsula, southwest Japan: Possible heat sources

Recognition of broad thermal anomaly around the median tectonic line in central Kii peninsula, southwest Japan: Possible heat sources
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日本西南部纪伊半岛中部中位构造线周围存在广泛的热异常:可能的热源

DOI:
10.1111/iar.12440
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发表时间:
2022
期刊:
影响因子:
1.5
通讯作者:
Simon Wallis
Simon Wallis
中科院分区:
地球科学4区
文献类型:
--
作者:
Ken Yamaoka;Simon Wallis

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对纪伊半岛中部低品位三八川带的变质沉积岩样品应用含碳材料测温的拉曼光谱,发现温度从靠近北方边界的约390 °C逐渐降低,主要大陆剪切带-中间构造线(MTL)-到约270 °C和南部约7 km,此后温度分布大致恒定。在三坝川带内,热结构没有被不同地质单元之间的滑动断层边界或褶皱显著改变。细观和微观结构观察结合应变分析,使用Meta泥岩中的碎屑颗粒,表明整个区域的变形历史相似,延性应变和温度梯度之间没有相关性。这些观测结果表明,所观察到的热结构的主要阶段的三坝川带的韧性变形完成后,并不是由于局部的优先折返沿着MTL。观测还需要与MTL一起沿着热源。数量级的估计表明,温暖的流体沿沿着MTL的流入是可行的原因所观察到的热异常。尽管剪切加热是另一种可能的解释,但热计算需要沿着MTL的异常快速滑动速率和比通常认为合理的大得多的摩擦强度。由于这些原因,液体渗透是我们的首选模型。
Application of Raman spectroscopy of carbonaceous material thermometry to samples of metasedimentary rock from the low‐grade Sanbagawa belt in the central Kii peninsula reveals a progressive decrease in temperature from ~390 °C close to the northern boundary, a major continental shear zone—the median tectonic line (MTL)—to ~270 °C and ~7 km to the south and roughly constant temperature distribution thereafter. Within the Sanbagawa belt, the thermal structure is not significantly modified by slip‐on fault boundaries between different geological units or folding. Meso‐ and microstructural observations combined with strain analysis using detrital grains in meta‐mudstone indicate a similar deformation history throughout the area and no correlation between ductile strain and temperature gradients. These observations suggest the observed thermal structure was developed after the main stages of ductile deformation of the Sanbagawa belt were complete and are not due to localized preferential exhumation along with the MTL. The observations also require a heat source along with the MTL. Order of magnitude estimates suggest the influx of warm fluid along the MTL are viable causes of the observed thermal anomaly. Although shear heating would be another possible explanation, thermal calculations require anomalous fast slip rates along the MTL and much greater frictional strength than generally considered reasonable. For these reasons, fluid infiltration is our preferred model.
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