西准噶尔包古图地层小区上泥盆统红山梁组的建立及地质意义
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1.长安大学;2.长安大学地球科学与资源学院;3.中国石油 新疆油田分公司

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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)”;中石油前瞻性基础研究项目“地层不整合油气藏成藏主控因素与关键要素定量评价技术研究”(2021DJ0405)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,区域地质学及地球化学;E-mail:yongjunl@chd.edu.cn ,彭南赫1,王绪龙2a,朱钊1,郑孟林2b,杨高学1,张越迁2a


Fig. 1 Schematic map of geological structure in Karamay-Baikouquan area, Western Junggar (a-schematic map of geological structure and stratigraphic area of Junggar; b- Stratigraphic subdivision map of Junggar(modified from Li et al., 2021)
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1.Chang'2.'3.an University;4.Chang&5.amp;6.#39;7.&8.Xinjiang Oilfield Company, PetroChina;9.Chang'an University

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    摘要:

    西准噶尔包古图地层小区白碱滩北红山梁剖面上新发现一套晚泥盆世红色“硅质岩、粉砂质硅质岩、凝灰质硅质岩”海相沉积组合,与上覆包古图组深灰色-灰黑色含碳粉砂岩呈整合接触。区域对比确认,该套地层显著有别于研究区乃至整个西准噶尔地层分区已发现的全部上泥盆统各组岩石地层,符合“野外可识别、界面可区别、区域可对比、图面可表达”之“四可”原则,据此新建红山梁组。本次于红山梁组枕状玄武岩、玄武岩、安山岩中分别获得365.9±5.0Ma、370.6±7.4Ma和374.6±3.6Ma的LA-ICP-MS锆石U-Pb年龄,佐证其时代为晚泥盆世。红山梁组与包古图组连续沉积之确认,消除了包古图组老于希贝库拉斯组这一存疑,弥补了完整的下石统地层序列,新增了包古图地层小区泥盆纪的沉积记录,为区域沉积与构造演化研究提供了新资料。

    Abstract:

    A new set of red marine sedimentary assemblages (siliceous, silty siliceous and tuffaceous siliceous rocks) with ages of late Devonian has been found in the Hongshanliang section of the northern Baijiangtan in the Baogutu stratigraphic minor-region, West Junggar. It is conformable contact with the dark-gray to gray-black carbonaceous siltstones of the overlying Baogutu Formation. Regional correlation confirmed that this set of strata is significantly different from all the Upper Devonian strata in the study area and even in the whole West Junggar stratigraphic area. This sedimentary sequence is suitable for the "four principles" of "field recognition, interface distinction, regional correlation and map expression". Therefore, a new Hongshanliang Formation was established. LA-ICP-MS zircon U-Pb ages of 365.9±5.0Ma, 370.6±7.4Ma and 374.6±3.6Ma were obtained from Hongshanliang basalt, pillow basalt and andesite, respectively, indicating a Late Devonian age. The confirmation of the continuous deposition of Hongshanliang and Baogugu formations not only eliminates the doubt of the Baogutu Formation older than the Xibeikulasi Formation , but also supplements the complete stratigraphic sequence of lower Carboniferous, and adds the Devonian sedimentary records in the Baogutu stratigraphic minor-region. This provides new data for the study on regional sedimentary and tectonic evolution of West Junggar.

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  • 收稿日期:2023-05-11
  • 最后修改日期:2023-06-16
  • 录用日期:2023-12-05
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