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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
Discovery of Early Permian radiolarian fauna in the Solon Obo ophiolite belt,Inner Mongolia and its geological significance

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李钢柱 1 *   王玉净 2   李成元 1   白宇明 1   薛建平 1   赵广明 1   薄海军 1   梁月升 1   刘伟 1  
文摘 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.
其他语种文摘 The Solon Obo ophiolite belt in Inner Mongolia is located close to the border between China and Mongolia. It is an integral part of the Solon Obo tectonic suture formed by the closure of the Paleo-Asian Ocean between Siberia Craton and North China Craton in the Paleozoic. This ophiolite belt is a rare remnant of the Paleo-Asian Ocean and thus provides important samples for the study of tectonic evolution in the eastern part of the Central Asian Orogenic Belt in North China. The age of the tectonic event of the Solon Obo tectonic suture has been debated for a long time. Some researchers believe that it was from Silurian to Devonian whereas other researchers believe it was from Early Carboniferous to Early Permian. Here we report the first discovery of Early Permian radiolarians in the cherts of the ophiolite belt. The Solon Obo ophiolite belt is E-W trending, with a total length of ~100 km. It is mainly composed of ultramafic intrusive rocks such as harzburgite, lherzolite, dunite and pyroxenite, and gabbro, diabase, basalts and cherts. On the base of the field geological investigation and 1:10000 structure-lithology mapping in the Solon Obo area, we took cherts samples from the Solon Obo ophiolite belt in the Subuergen Hudag area of northern Urad Middle Banner, Inner Mongolia, and carried out studies including petrologic characteristics of cherts, separation and identification of the radiolarian fossils in cherts. Early Permian radiolarian fauna is first found in the chert of Solon obo ophiolite belt. This fauna is composed of 5 genera and 6 species (including 4 unidentified species and 1 new species), Pseudoalbaillella bulbosa, Ps. solonensis Wang sp. nov.,Stigmosphaerostylus sp.,Ruzhencevispongus sp.,Cenosphaera sp., Latentifistula sp. etc. The new species, Pseudoalbaillella solonensis can be distinguished from Ps. u-forma by its holes in the end of the pseudoabdominal segment. Pseudoalbaillella bulbosa, found in Late Carboniferous-Early Permian cherty strata of Japan, Thailand, Chile, Western Coast of North America and South China is regarded as a zonal species of early Early Permian time in China and has become one mark of the boundary between Carboniferous and Permian cherty strata in open marine facies. This radiolarian fauna is characterized by rich Pseudoalbaillellids and Entactinids which have possessed about 45% of this fauna respectively. The Pseudoalbaillellids are mostly composed of the apical cones and many pseudothoraxes with smaller entire individuals. The Entactinids are numerous in number and their spines are longer, but incomplete due to break. Other radiolarians, such as Latentifistalids, Cenosphaerids and Ruzhencevispongids are rare. These radiolarian fossils possessing over 50% in whole rocks are considered as the radiolite which is a component of the ophiolite. Therefore, the time determined by radiolarian fossils may represent forming age of the ophiolites and this set of radiolite is known as a part of the Solon Obo ophiolite belt. The discovery of this radiolarian fauna has provided a key evidence about forming age of the Solon Obo ophiolite lasted until Early Permian. This new discovery, together with the previously reported zircon U-Pb ages of 279-296 Ma for the associated mafic-ultramafic rocks in the Solon Obo ophiolite belt, confirms that the final closure of the Paleo-Asian Ocean took place no early than Early Permian.
来源 科学通报 ,2017,62(5):400-406 【核心库】
DOI 10.1360/N972016-00703
关键词 放射虫 ; 早二叠世 ; 蛇绿岩 ; 索伦山 ; 古亚洲洋
地址

1. 武警黄金第二支队, 呼和浩特, 010010  

2. 中国科学院南京地质古生物研究所, 南京, 210008

语种 中文
文献类型 研究性论文
ISSN 0023-074X
学科 地质学;古生物学
基金 国土资源部中国地质调查局地质调查项目
文献收藏号 CSCD:5913504

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