| 东天山博格达地区石炭系构造-地层划分及成盆背景分析 |
| |
| 引用本文： | 樊丹,李涤,何登发,侯烁钦,孙天鸽,杨浩,甄宇.东天山博格达地区石炭系构造-地层划分及成盆背景分析[J].现代地质,2022,36(5):1206-1217. |
| |
| 作者姓名： | 樊丹 李涤 何登发 侯烁钦 孙天鸽 杨浩 甄宇 |
| |
| 作者单位： | 1.中国地质大学(北京) 能源学院,北京 1000832.海相储层演化与油气富集机理教育部重点实验室,北京 100083 |
| |
| 基金项目： | 国家自然科学基金项目(42172124);国家自然科学基金项目(41702110) |
| |
| 摘 要： | 东天山博格达地区经历了古生代长期俯冲增生与中—新生代多期陆内变形改造作用,但对于博格达山石炭纪构造属性与演化阶段等问题始终存在争议,制约了对北疆晚古生代构造格局的认识。利用博格达山露头及其两侧盆地钻井、地震资料,运用盆地构造分析思路与方法从盆-山尺度开展了石炭系地层格架及岩浆活动特征综合对比研究,划分博格达地区石炭系构造-地层单元并分析石炭纪构造背景。研究结果显示:博格达山相邻的准噶尔盆地和吐哈盆地发育下石炭统与下伏地层(C1/AnC)不整合,而上、下石炭统之间(C2/C1)、二叠系与上石炭统(P/C2)不整合在博格达山及相邻盆地普遍存在,由此将博格达地区石炭系划分为下石炭统和上石炭统2个主要构造层,揭示研究区经历了两个主要的构造演化阶段。进一步结合构造变形演化、盆地构造沉降特征及构造环境分析结果,认为博格达山石炭纪为俯冲相关伸展背景下的弧后盆地,经历了早、晚石炭世两阶段伸展裂陷作用,并在裂陷晚期均明显遭受了周缘块体碰撞拼贴事件的影响。
|
| 关 键 词： | 石炭系 不整合面 构造-地层层序 弧后裂陷盆地 博格达地区 天山造山带 |
| 收稿时间： | 2022-03-01 |
| 修稿时间： | 2022-06-30 |
Carboniferous Tectono-stratigraphic Division and Basin-forming Background in the Bogda Area,Eastern Tianshan |
| |
| FAN Dan,LI Di,HE Dengfa,HOU Shuoqin,SUN Tiange,YANG Hao,ZHEN Yu.Carboniferous Tectono-stratigraphic Division and Basin-forming Background in the Bogda Area,Eastern Tianshan[J].Geoscience——Journal of Graduate School,China University of Geosciences,2022,36(5):1206-1217. |
| |
| Authors: | FAN Dan LI Di HE Dengfa HOU Shuoqin SUN Tiange YANG Hao ZHEN Yu |
| |
| Institution: | 1. School of Energy Resources, China University of Geosciences, Beijing 100083, China2. Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, Beijing 100083, China |
| |
| Abstract: | The Bogda area experienced the evolution processes involving the Paleozoic subduction-accretion and Meso-Cenozoic multi-stage intracontinental deformation, but controversies remain regarding the Carboniferous tectonic attribute and evolutionary stages in the Bogda Mountain, which restricts further research on the late Paleozoic tectonic framework in North Xinjiang. Integrating the outcrop geology, borehole and seismic data from the Bogda Mountain and its adjacent basins, we carried on a comprehensive comparative study of the Carboniferous stratigraphic framework and magmatic characteristics in a basin-orogen scale by the basin analysis theory and method. Accordingly, we divided the Carboniferous tectonic-stratigraphic units in the Bogda area and analyzed the Carboniferous tectonic setting. Our results show that the unconformity between the Lower Carboniferous and pre-Carboniferous strata (C1/AnC) are present in the Junggar Basin and Tuha Basin adjacent to the Bogda Mountain, while the unconformities, including the Upper and Lower Carboniferous (C2/C1), and Permian and Upper Carboniferous (P/C2) ones, are commonly developed in the Bogda Mountain and its adjacent basins. Thus, the Carboniferous strata in the Bogda area are subdivided into two tectono-stratigraphic units, i.e., Lower Carboniferous and Upper Carboniferous, which reveals that the study area has undergone two major tectonic evolutionary stages. Combining the structural deformation evolution, basinal subsidence characteristics and tectonic setting, we suggested that the Carboniferous Bogda represents a back-arc basin in the subduction-related extension regime, which underwent two stages of rifting. The peripheral collisional events may have caused the later tectonic inversion for both rift basins during the late period. |
| |
| Keywords: | Carboniferous unconformity tectono-stratigraphic sequence back-arc rift basin Bogda area Tianshan Orogenic Belt |
|
| 点击此处可从《现代地质》浏览原始摘要信息 |
| 点击此处可从《现代地质》下载免费的PDF全文 |
|
