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| 鄂尔多斯盆地中生代沉积和堆积中心迁移及其地质意义 | |
| 引用本文： | 赵俊峰,刘池洋,喻林,王晓梅.鄂尔多斯盆地中生代沉积和堆积中心迁移及其地质意义[J].地质学报,2008,82(4):540-552. |
| 作者姓名： | 赵俊峰 刘池洋 喻林 王晓梅 |
| 作者单位： | 1. 西北大学大陆动力学国家重点实验室,西安,710069;西北大学博士后流动站,西安,710069 2. 西北大学大陆动力学国家重点实验室,西安,710069 3. 东方地球物理公司研究院,河北涿州,072751 4. 西安石油大学油气资源学院,西安,710065 |
| 基金项目： | 本文为国家重点基础研究发展规划“973”项目(编号 2003CB214600)和长江学者和创新团队发展计划(编号 IRT0559)资助的成果。 |
| 摘 要： | 通过对鄂尔多斯盆地中生代构造属性、原盆面貌、岩性岩相组合、物源分析和厚度分布特征等的综合研究表明，从中晚三叠世至早白垩世，盆地沉积中心由东南向北、再向西南发生逆时针迁移；在盆地西部，早白垩世沉积前没有统一或规模较大的堆积中心，仅存在孤零分布或彼此分割、规模不大的局部堆积中心。盆地西部多个时期出现的地层较厚分布区带，是该区距盆地西界较近，物源供给充足、水动力作用强所致，故代表局部堆积中心。早白垩世，沉积、堆积和沉降中心才在盆地西南部“三位一体” 叠合分布。直到中侏罗世末，在黄河之西的今盆地残留区，总体仍呈西高东低的古地理—构造格局。盆地中晚三叠世—中侏罗世各期的沉积中心在位置上大体一致，上下大部重叠；该沉积中心及近邻，古生界和中生界的热演化程度为盆地最高，显示该区深部作用较为活跃。综合分析认为，中生代各期沉积中心的叠置及其与高热演化地区的重合，反映为总体受沉降中心控制所致，可作为盆地沉降中心的代表。大型鄂尔多斯克拉通内盆地中生代各期沉积(沉降)中心在位置上偏于盆地南部，与秦岭造山带同期强烈的会聚造山活动产生的前陆挠曲沉降相关。 |
| 关 键 词： | 鄂尔多斯盆地 沉积中心 堆积中心 沉降中心 中生代 秦岭造山带 |
| 收稿时间： | 2007/12/27 0:00:00 |
| 修稿时间： | 2007年12月27 |
The Transfer of Depocenters and Accumulation Centers of Ordos Basin in Mesozoic and Its Meaning |
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| ZHAO Junfeng,LIU Chiyang,YU Lin,WANG Xiaomei.The Transfer of Depocenters and Accumulation Centers of Ordos Basin in Mesozoic and Its Meaning[J].Acta Geologica Sinica,2008,82(4):540-552. | |
| Authors: | ZHAO Junfeng LIU Chiyang YU Lin WANG Xiaomei |
| Abstract: | Comprehensive research on the structure attributions,the primary basin features,the combination of lithology and lithofacies,provenance analysis,and the distinction of thickness distribution of the Ordos Basin in the Mesozoic,suggests that the depocenters of the basin transferred contraclockwise from southeast to north,then to southwest from middle Late Triassic to Early Cretaceous.There was no a unified or lager-scale accumulation center present at the west of the basin before Early Cretaceous,but only small,isolated accumulated centers occurred.The reason why thicker strata appear to the west of the basin in multi-stages is that these areas were much close to the west boundary of the primary basin,where abundant water source offered huge power.Therefore it stands for the local accumulation centers.Till Early Cretaceous,the depocenters,the accumulation and subsidence centers were superposed as an entity in the southwest of the basin.It was not until the Middle Jurassic that the extant residual basin in the west of the Yellow River took a paleogeographic structural pattern of high in the west and low in the east.The depocenters of the Ordos Basin remained and were superposed consistently from middle Late Triassic to middle Jurassic.The higher thermal maturation of Mesozoic and Paleozoic strata in the depocenters and its neighborhood indicate an active effect at depth in these areas.Comprehensive research suggests that superposition of depocenters in several periods and its consistence with higher thermal maturation centers,reflect that the basin is controlled generally by subsidence centers.Therefore,the depocenters may represent the centers of subsidence.Most of the subsidence or depocenter centers within the large-scale Ordos craton during Mesozoic were distributed in the south of the Ordos Basin,and are closely associated with flexing and subsiding of the foreland,resulted from strong converged orogenic activity,which took place at the same time as the Qinling Orogenic belt. |
| Keywords: | Ordos basin depocenter accumulation center center of subsidence Mesozoic Qinling orogenic belt |
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