The subhorizontal boundary between serpentinite bodies and sedimentary layers in the Shimanto Belt, Yaseo area of Satsuma Peninsula, southern Kyushu, Japan

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  • 薩摩半島八瀬尾地域の蛇紋岩体と四万十帯堆積岩層との低角境界
  • サツマ ハントウ ヤセオ チイキ ノ ジャモンガンタイ ト シマントタイ タイセキガンソウ ト ノ テイカク キョウカイ

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Abstract

In this study, we revisited a serpentinite occurrence in the Shimanto Belt. Serpentinite is sporadically distributed along a distance of 1400 m in a north—south-striking zone, across a width of about 250 m, at Yaseo on the Satsuma Peninsula. We mapped isolated blocks, debris deposits, and massive bodies of serpentinite. Two significant serpentinite bodies are exposed over areas measuring approximately 100×50 m and 200×70 m. These bodies overlie west-dipping sandstone and mudstones layers; the boundary between serpentinite and sedimentary layers is subhorizontal. Brittle shear planes near the structural base of serpentinite indicate top-to-the-east displacement. The serpentinite bodies are interpreted as klippes that were structurally emplaced onto the sedimentary sequence of the Shimanto Belt.

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