西准噶尔包古图组的岩石组合及其时限
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1.<2.sup>3.长安大学<4./sup>5.a <6.地球科学与资源学院<7.陕西<8.西安<9.b <10.地质工程与测绘学院<11.中国石油<12.新疆油田分公司<13.a<14.勘探事业部<15.勘探开发研究院<16.长安大学地球科学与资源学院

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国家科技重大专项“新疆北部深层区域构造格架、沉积演化与有利区带评价(2017ZX05008-006-003-001)” 国家重点研发计划“深地资源勘查开采重点专项(2018YFC060400)”中国石油天然气股份有限公司科学研究与技术开发项目“北疆海相泥盆-石炭系油气地质研究(2022DJ0507)”;第一作者:李永军,男,1961年生。教授,博士生导师,主要从事构造地质学、区域地质学教学与科研工作。E-mail:yongjunl@chd.edu.cn a),王绪龙2a),段丰1b),朱钊1a),郑孟林2b),杨高学1a),张越迁2a)


Age and rock assembly of Baogutu Formation in West Junggar
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1.Chang’an University;2.Xinjiang Oilfield Company, PetroChina;3.School of Earth Science and Resources,Chang’an University

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    摘要:

    包古图组是西准噶尔增生造山带西北缘早石炭世重要沉积记录。确认其完整的沉积序列、岩石组合及其与上覆和下伏地层的接触关系,对解析本区晚古生代盆地构造演化具有重要意义。作者团队新实测的白碱滩北红山梁剖面上,出露了岩石组合截然有别,色调区分性极强的两大套地层,上部深灰—灰黑色调“(含碳)细碎屑岩”与其下伏鲜红色调的“硅质岩—凝灰质硅质粉砂岩间夹中基性火山岩”为连续沉积(整合接触),分属包古图组和红山梁组。本次于包古图组底部和红山梁组顶部获得345Ma和365.9Ma的LA-ICP-MS锆石U-Pb年龄,限定其时代分别为早石炭世和晚泥盆世。这一新发现,不仅确立了包古图组是区内石炭纪最老地层单位,佐证了包古图组老于希贝库拉斯组这一久争悬疑,而且使得区内下石炭统有了完整的地层序列,揭秘了石炭系最底部的沉积建造及其岩石组合,也为完整认识泥盆纪—石炭纪这一重要时期的盆地沉积特征及其构造演化提供了新资料。

    Abstract:

    The Baogutu Formation is an important early Carboniferous sedimentary record in the southern margin of the West Junggar accretionary orogenic belt. To confirm the complete sedimentary sequence, rock assemblages and their contact relations with overlying and underlying strata is of great significance for the analysis of Late Paleozoic tectonic evolution of Junggar basin. The newly measuredHongshanliang section in the northern Baijiantan reveals two sets of strata with distinct rock assemblages and strong tonal distinction. The upper gray-black "carbonaceous fine clastic rock" and the underlying bright red "chert, silty chert and tuffaceous chert sandwiched with basic to intermediate volcanic rocks namely conformable contact), belonging to the Baogutu Formation and Hongshanliang Formation, respectively. LA-ICP-MS zircon U-Pb ages of 345 Ma and 365.9 Ma were obtained from the bottom of the Baogutu Formation and the top of the Hongshanliang Formation, and their ages are defined as Early Carboniferous and Late Devonian, respectively. This new discovery not only confirms that the Baogutu Formation is the oldest Carboniferous stratigraphic unit in the region, but also proves that the Baogutu Formation is older than the Xibeikulasi Formation. Moreover, this makes a complete stratigraphic sequence of the Lower Carboniferous in this region and reveals the sedimentary construction and rock assemblage at the bottom of the Carboniferous system, which provides new data for a complete understanding of the sedimentary characteristics and tectonic evolution of the basin during the Devonian to Carboniferous period.

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  • 收稿日期:2022-11-23
  • 最后修改日期:2022-12-31
  • 录用日期:2022-12-31
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