内蒙古索伦山蛇绿岩带早二叠世放射虫动物群的发现及其地质意义

发布时间：2018-06-03 15:25

本文选题：放射虫 + 早二叠世　；参考：《科学通报》2017年05期

【摘要】：位于中蒙边境地区的索伦山蛇绿岩带,是古生代存在于西伯利亚板块与华北板块之间的古亚洲洋闭合之后形成的索伦山缝合带的重要组成部分.索伦山蛇绿岩的研究,对认识古亚洲洋演化具有重要意义,但其时代一直是学术界争论的焦点问题之一.本次工作采集索伦山蛇绿岩带硅质岩样品,对其进行了放射虫化石的分选与鉴定.在内蒙古乌拉特中旗北部靠近中蒙边境线的索伦山蛇绿岩带硅质岩中发现早二叠世放射虫动物群,包括5个属6个种,其中有4个未定种和1个新种:Pseudoalbaillella bulbosa,Ps.solonensis Wang sp.nov.,Stigmosphaerostylus sp.,Ruzhencevispongus sp.,Cenosphaera sp.,Latentifistula sp.等.Pseudoalbaillella bulbosa这个种在日本、泰国、智利、北美西海岸和中国华南等地发现在晚石炭世-早二叠世硅质岩相地层中,在中国作为早二叠世早期的一个带种,成为广海相硅质岩相区石炭系与二叠系分界的标志.这套放射虫硅质岩属索伦山蛇绿岩的组成部分,该动物群的发现为索伦山蛇绿岩形成时间持续到早二叠世提供了关键证据.这些新证据证实了古亚洲洋在早二叠世时仍存在,古亚洲洋通过俯冲消减最终闭合应是在早二叠世之后.
[Abstract]:The Sorenshan ophiolite belt, located on the border between China and Mongolia, is an important part of the Suolenshan suture belt formed after the closure of the Paleo-Asian Ocean between the Siberian plate and the North China plate in the Paleozoic. The study of ophiolite in Soolun Mountain is of great significance in understanding the evolution of the Paleo-Asian Ocean, but its age has always been one of the hot issues in academic circles. In this work, siliceous rock samples from the ophiolite belt of Solenshan are collected, and the radiolarian fossils are sorted and identified. The early Permian radiolarian fauna, including 5 genera and 6 species, was found in the siliceous rocks of the Solenshan ophiolite belt in the northern part of Wulat Zhongqi, Inner Mongolia, with 4 undetermined species and 1 new species Pseudoalbaillella bulbosaensis Wang sp.nov.Stigmosphaerostylus sp.Ruzhencencevispongus sp. P.entifistula sp. and a new species, Pseudoalbaillella bulbosaensis Ps.solonensis Wang sp.nov.Ruzhencencevispongus sp.entifistula sp. Pseudoalbaillella bulbosa, a species found in the late Carboniferous and early Permian siliceous facies strata in Japan, Thailand, Chile, the West Coast of North America and South China, was found in China as a belt in the early Permian. It has become the mark of the boundary between Carboniferous and Permian in the marine siliceous facies area. This set of radiolarian siliceous rocks is part of the Solenshan ophiolite, and the discovery of the fauna provides the key evidence for the formation time of the Solenshan ophiolite to the early Permian. These new evidences confirm that the paleo-Asian oceans still existed during the early Permian, and the final closure of the paleo-Asian oceans by subduction should be after the early Permian.
【作者单位】：武警黄金第二支队;中国科学院南京地质古生物研究所;中国地质大学地球科学与资源学院;
【基金】：中国地质调查局地质调查项目(12120113071800)资助
【分类号】：Q915;P534.46

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