阿武隈山地北部の上部デボン系-下部石炭系と立石ナップ

概要

論文の詳細を見る
The stratigraphy of the weakly metamorphosed Paleozoic System of the Mano river area in the northern Abukuma Mountains is reexamined by the newly discovered fossils, and the deformation fabrics of the Tateishi Formation is analysed and modeled. The Tateishi Limestone exhibits intense ductile shear fabrics. The deformation is marked by the bedding-parallel schistosity, and N30°E trending horizontal stretching lineation, strong uniaxially stretching strains, and the shear fabrics of the northward ductile shear along the schistosity and lineation. The microtextures are indicative of calc-mylonite. The over-riding Permian and underlying Upper Devonian-Lower Carboniferous show no clear shear fabrics, except for postdated uniaxial compressive strains related to slaty cleavage. And hence, we introduce here the Tateishi nappe, which transported the Permian northwards with respect to the underlying strata along the ductilely deformed Tateishi calc-mylonite. The sole calc-mylonite appears to behave as a lubricant layer.
地学団体研究会の論文
1988-07-25