大兴安岭索伦地区哲斯组碎屑岩地球化学特征和锆石U-Pb年龄对沉积物源属性约束

doi:10.13278/j.cnki.jjuese.20190324

摘要/Abstract

摘要： 本文以内蒙古索伦地区好仁镇出露良好的中二叠世哲斯组碎屑岩为研究对象，利用碎屑岩地球化学特征和锆石年代学等示踪技术分析哲斯组沉积物源的年代和性质。测年结果显示，哲斯组砂岩碎屑锆石U-Pb年龄分为6组：282~244、352~294、468~379、513~482、802~580、2 500~1 800 Ma。碎屑岩地球化学具有高SiO₂和低Fe₂O₃、FeO、MgO质量分数的特点，说明其母岩为长英质岩石。稀土、微量元素特征及其构造图解显示，哲斯组沉积物源区多具有大陆岛弧型和活动大陆边缘型的特点，少量反映被动大陆边缘的特点。对比研究显示，沉积物源区所反映的大陆岛弧型和活动大陆边缘型的构造环境是不同时期佳-蒙地块拼合碰撞和古亚洲洋南支北向俯冲的结果，少量所反映的被动大陆边缘环境可能是部分基底岩石形成时构造环境的响应。鉴于研究区位于兴安地块东南部，远离华北地块，且哲斯组碎屑岩多为长石岩屑砂岩、岩屑长石砂岩、岩屑砂岩，其结构成熟度和成分成熟度较低，显示近源沉积的特点，与其同期的火成岩均显示岛弧或活动大陆边缘的构造背景，据此推测哲斯组应形成于古亚洲洋南支向佳-蒙地块俯冲形成的弧后或弧间盆地环境，物源主要来自于佳-蒙地块南缘与岛弧或活动大陆边缘有关的火成岩，少量来自于佳-蒙地块的古老基底。

关键词: 碎屑锆石年龄, 地球化学, 物源分析, 哲斯组, 内蒙古索伦地区

Abstract: This paper focused on the clastic rocks of the Middle Permian Zhesi Formation, well exposed in the Haoren Town, Suolun region of Inner Mongolia. Geochemistry and zircon geochronology analyses were conducted, in order to constrain the ages and origins of sediment provenance. The dating results show that the U-Pb ages of detrital zircons from the Zhesi Formation sandstone can be divided into six groups, i.e., 282-244 Ma, 352-294 Ma, 468-379 Ma, 513-482 Ma, 802-580 Ma, and 2 500-1 800 Ma, respectively. Geochemically, the sandstone samples have high SiO₂, and low Fe₂O₃, FeO, and MgO contents, indicating they were mainly deposited from felsic rocks. Rare earth elements and trace elements characteristics and tectonic distinguished diagrams suggest the sediment source region of the Middle Permian Zhesi Formation dominantly displays similar features with those of continental arc and active continental margin, with minor corresponding to passive continental margin. The former setting is the results of the amalgamation-collision of the Jiamusi-Mongolia block and northwards subduction of the south branch of the Paleo-Asian Ocean during different stages, while the later one probably reflects the tectonic setting of the generation of some basement rocks. Considering the facts that:1) the study region is located in the southeastern Xing'an block, far away form the North China craton; 2) the Zhesi Formation clastic rocks mainly consist of feldspar lithic sandstone, lithic feldspar sandstone, and lithic sandstone with relatively low structure and ingredient maturity, suggesting characteristics of near-source deposition; and 3) the coeval igneous rocks in the surrounding regions were all formed in subduction-related settings, it is proposed here that the Zhesi Formation was most likely deposited in a back-arc or inter-arc basin related with the northwards subduction of the south branch of the Paleo-Asian Ocean beneath the Jiamusi-Mongolia block, and their provenance was dominantly from the subduction-related igneous rocks in the southern margin of the Jiamusi-Mongolia block, with little contributions from ancient basement of the Jiamusi-Mongolia block.

Key words: detrital zircon ages, geochemistry, provenance analyses, Zhesi Formation, Suolun region of Inner Mongolia

中图分类号:

P588.2

和钟铧, 王启智, 王强. 大兴安岭索伦地区哲斯组碎屑岩地球化学特征和锆石U-Pb年龄对沉积物源属性约束[J]. 吉林大学学报(地球科学版), 2020, 50(2): 405-424.

He Zhonghua, Wang Qizhi, Wang Qiang. Geochemistry and Zircon U-Pb Ages of Clastic Rocks of Zhesi Formation in Suolun Region, Great Xing’an Range: Constraints on Origins of Sediment Provenance[J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 405-424.

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