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片理(Schistosity)是区域变质岩系特有的最常见的分布最广的一种构造形迹。不少地质学者比较重视对它的研究,提出不同的认识,其中分歧较大的要算顺层片理(beddingschistosity)了。一是认为与层面一致的片理属顺层片理,另一种认为顺层片理是轴、面片理(aXial Plane Schistosity)在倒转褶皱或等斜褶皱翼部的表现[1]。为了探讨顺层片理与褶皱的关系,从1976年以来,我们在河南省桐柏县围山城金、银多金属矿带进行1:10000地质测量的同时,对这里的顺层片理进行了初步研究。本文将根据对该区的研究,结合大别山、秦岭、会理等地变质岩系片理观察,讨论顺层片理的主要特征、顺层片理与褶皱的关系、顺层片理形成机制等问题。
Schistosity is the most common and widespread structural trace unique to regional metamorphic rocks. Many geologists pay more attention to its research and put forward different understandings. The larger the differences, the more beddingschistosity is. The other is that the cohesion is the manifestation of aXial Plane Schistosity in inverting fold or equatorial folds [1]. In order to explore the relationship between the stratification and folds, we conducted a 1: 10000 geological survey of gold and silver polymetallic ore belts in Weishancheng, Tongbai County, Henan Province since 1976, initial research. Based on the study of the area and the observation of the metamorphic rocks in the Dabieshan, Qinling and Huili areas, the paper discusses the main features of the stratification, the relationship between the stratification and folding, the formation mechanism of the stratification problem.