新疆北部早石炭世沉积建造及其形成的大地构造环境

本文详细地研究了新疆北部早石炭世发育的三类沉积建造:碳酸盐建造、陆屑建造和火山-沉积建造,并进行了建造区的划分,据此论述了早石炭世新疆北部的大地构造环境及其分区。

EARLY CARBONIFEROUS SEDIMENTARY FORMATIONS AND THEIR GEOTECTONIC SETTINGS IN N.XINJIANG

The Lower Carboniferous in northem Xinjiang can be classified into three types of sedimentary formations, that is ;(1) carbonate formation lying in the Southern and Northern Tianshan and the western part of the Middle Tianshan and consisting mainly of micritic, bioclastic micritic and oolitic limestones, (2) terrigenous clastic formation being widely known from all over the area and composed mainly of dark graywacke, tuffaceous graywacke, siltstone and siltpelite; and (3) volcanic-sedimentary rock formation developed in the Wulungu-Beitashan area and Middle Tianshan and consisting mostly of Littoral-neritic volcanic rocks and terrigenous clastic rocks. From the characteristics of the Early Carboniferous sedimentary formations, it is clear that the study area belonged, at that time, to the same gecsynclinal region, was in the maximum-mobility period of geosynclinal stage, and can be divided into three second-order units: Altay-North Junggar geosynclinal system, South Junggar geanticlinal system, and Tianshan geosynclinal system.