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地质概况夜久野蛇绿岩分布于一个狭窄的 Maizuru 蛇绿带中,呈 WNW 方向分布于西南日本的内带(图1,a),包括玄武质火山岩、镁铁-超镁铁堆晶岩和残余橄榄岩的蛇绿岩完整序列,出露于大岛和夜久野之间,然而每部分则呈分离的构造碎片。此蛇绿岩在二叠纪侵位前已经历了低压葡萄石、绿纤石相至麻粒岩相变质作用,二叠纪末抬升出露,后又被三叠系覆盖。此蛇绿岩和盖层向南逆掩于丹波带的大陆边缘石炭至侏罗系之上。
Geological overview Late Yukino ophiolite is distributed in a narrow Maizuru ophiolite belt, WNW direction distribution in Southwest Japan (Figure 1, a), including basaltic volcanic rocks, mafic-ultramafic pluton and remnants The complete sequence of ophiolite rocks of peridotite is exposed between the Big Island and the night field, however, each section shows a separate structural fragment. The ophiolite experienced low-pressure gravel, green-fiber phase to granulite facies metamorphism prior to the Permian emplacement, uplift and exhumation at the end of Permian, and later covered by Triassic. This ophiolite and caprock are thrust southward over the continental margin of Carboniferous to Jurassic in the Tanband.