首页|西准噶尔构造带包古图地层小区上泥盆统红山梁组的建立及地质意义

西准噶尔构造带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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西准噶尔构造带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.经区域对比确认,该套地层显著有别于研究区乃至整个西准噶尔构造带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"的原则,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±5.0 Ma、370.6±7.4 Ma和374.6±3.6 Ma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,建立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.
Establishment of Upper Devonian Hongshanliang Formation and its geological significance in Baogutu stratigraphic minor-region, West Junggar tectonic belt
A new set of red marine sedimentary assemblages (siliceous, silty siliceous, and tuffaceous siliceous rocks) has been discovered in the Hongshanliang section of the northern Baijiantan in the Baogutu stratigraphic minor-region, West Junggar tectonic belt. These sedimentary rocks have been dated to the late Devonian and are in conformable contact with the dark-gray to gray-black carbonaceous siltstones of the overlying Baogutu Formation. Through regional correlation studies, it has been confirmed that this set of strata exhibits significant differences from all the Upper Devonian in the study area and even the entire West Junggar stratigraphic area. This sedimentary sequence aligns with the "four principles" of "field recognition, interface distinction, regional correlation, and map expression." Therefore, a new lithostratigraphic unit known as the Hongshanliang Formation has been established. LA-ICP-MS zircon U-Pb dating of the Hongshanliang basalt, pillow basalt, and andesite yielded ages of 365.9±5.0 Ma, 370.6±7.4 Ma, and 374.6±3.6 Ma, respectively, indicating a Late Devonian age for these rocks. The confirmation of continuous deposition of the Hongshanliang and Baogutu Formations not only resolves any uncertainties regarding the age relationship between the Baogutu Formation and the Xibeikulasi Formation but also contributes to a more comprehensive stratigraphic sequence for the lower Carboniferous. Moreover, the discovery of Devonian sedimentary records in the Baogutu stratigraphic minor-region provides new data for the study of regional sedimentary and tectonic evolution in West Junggar tectonic belt.

Upper Devonian Hongshanliang Formationmarine red chert assemblagesnew lithostratigraphic unitzircon U-Pb agesBaogutu stratigraphic minor-regionWest Junggar tectonic belt

李永军、黄家瑄、朱钊、王绪龙、彭南赫、郑孟林、杨高学、张越迁

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长安大学地球科学与资源学院,陕西西安,710054

中国石油新疆油田公司,新疆克拉玛依,834000

上泥盆统红山梁组 海相红色硅质岩组合 新建岩石地层单位 锆石U-Pb年龄 包古图地层小区 西准噶尔构造带

国家科技重大专项国家重点研发计划中国石油前瞻性基础研究项目中国石油科学研究与技术开发项目

2017ZX05008-006-003-0012018YFC0604002021DJ04052022DJ0507

2024

10.19762/j.cnki.dizhixuebao.2023188

地质学报
中国地质学会

地质学报

CSTPCD北大核心
影响因子：2.17
ISSN：0001-5717
年,卷(期)：2024.98(4)
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