豫西栾川地区“陶湾群”研究

A STUDY ON THE "TAOWAN GROUP" OF LUANCHUAN,WESTERN HENAN PROVINCE

本文探讨了栾川地区“陶湾群”的层序和时代,确定了在栾川牛栾—陶湾地区发育一大型韧性断裂带,所谓“秋木沟组”实际上是由韧性断裂带中的糜棱岩带和夹持其间的、由不同时代地层形成的中间岩块所组成,并确定了断裂带内中间岩块的地层归属。将原三岔口组解体为两部分,即震旦系三岔口组和下古生界陶湾组。所谓“陶湾群”实际上在不同地区包含了不同时代和不同岩性的地层,不是一个可以在一定空间进行对比的地层单元,因而作为一个“群”是不合适的。

The 'Taowan Group' is distributed in the north slope of the East Qinging Mountains. This article seeks to deal with the sequence and age of the 'Taowan Group' of the Luanchan region. A large ductile shear zone is found between the Niuluan and the Taowan areas. Inside the ductule zone. the formerly called 'Qioumugou Formation 'is composed of mylomte zones con- taining strata of different age. Based on correlation of petrological associations. sedimentary characteristics, and contents and distribution patterns of REE. the ages of the different strata are recognized. The former' Sanchakou Formation 'is now divided into two parts. ie. the Sinian Sanchakou Formation and the Lower Paleozoic Taowan Formation. Thus the - Taowan Group' includes geochronologically different strata units, and it is not appropriate to be called a group.