昆仑早古生代造山带研究进展

Progress in the study of the Early Paleozoic Kunlun orogenic belt

通过对1999年以来在昆仑山地区开展的1∶25万区域地质调查成果资料的分析,结合前人的研究成果,指出了东、西昆仑经历了早古生代造山作用。依据镁铁质—超镁铁质岩的性质及其产出状态、相伴的沉积、岩浆建造,结合前寒武纪地层的出露情况和变质热事件,将昆仑早古生代造山带分为3个大的构造单元,昆中构造带为早古生代的岩浆弧,北部为由库地-其曼于特-祁漫塔格镁铁质—超镁铁质岩带、滩间山群、奥陶系—志留系未分地层等相关边缘沉积体组成弧后盆地沉积、岩浆建造系统,南部为由柳什塔格-吐木勒克-乌妥镁铁质—超镁铁质岩、纳赤台群、温泉沟群共同组成弧前复理石增生楔杂岩带。

The authors have analyzed the data obtained from 1：250000 regional geological surveys carried out in the Kunlun Mountains since 1999. According to the analysis, combined with previous research results, they indicate that the East and West Kunlun underwent Early Paleozoic orogeny. On the basis of the nature and modes of occurrence of mafic-ultramafic and their associated sedimentary and magmatic formations, coupled with the outcropping conditions Precambrian strata and thermometamorphic even, the Early Paleozoic Kunlun orogenic belt may be divided into three major tectonic units. The Central Kunlun orogenic belt is an Early Paleozoic magrnatic arc. The northern part is a system of backarc basin sedimentary and magmatic formations composed of the Küda-Qirnanyute-Qirnantag mafic-ultramafic belt, Tanjianshan Group and Ordovician-Silurian undivided strata and some other related marginal sediments; and the southern part is a fore-arc flysch accretionary wedge complex composed of the Liushitag-Tumuleke-Urt mafic-ultramafic rocks, Naij Tal Group and Wenquangou Group.