| 渭河-三门峡盆地三门组沉积充填特征、物源区及其构造意义 |
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| 引用本文： | 刘瑾,陈兴强,王平,李廷栋.渭河-三门峡盆地三门组沉积充填特征、物源区及其构造意义[J].地球科学,2020,45(7):2673-2683. |
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| 作者姓名： | 刘瑾 陈兴强 王平 李廷栋 |
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| 作者单位： | 1.西安工业大学建筑工程学院, 陕西西安 710021 |
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| 基金项目： | 陕西省科技计划项目2019JQ-835陕西省教育厅自然科学研究专项2019JK-0404西安工业大学校长基金项目XAGDXJJ18018中国地质调查局项目DD20190370中国地质调查局项目DD20190367中国地质科学院基本科研业务费YWF201704 |
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| 摘 要： | 渭河盆地和三门峡盆地内发育的河湖相三门组沉积，记录了上新世-更新世的盆地沉积历史，对认识区域古环境及盆地演化特征具有重要意义.通过两个盆地三门组地层的沉积相分析和物源重建，发现2.8~2.6 Ma盆地环境发生了明显变化，2.8~2.6 Ma渭河盆地由深湖转为浅湖沉积，水位下降，而三门峡盆地由河流相转为滨浅湖，水位上升.结合前人古地貌重建和区域应力反演结果，认为上新世渭河盆地和三门峡盆地相互独立，早更新世两个盆地才连通，湖水由渭河盆地注入三门峡盆地，形成统一的三门古湖.对比区域构造事件和物源分析结果，认为青藏高原的快速隆升导致秦岭的抬升，可能是盆地及其水系演化的触发动力.
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| 关 键 词： | 渭河盆地 三门峡盆地 三门组 新构造 构造地质 |
| 收稿时间： | 2020-05-12 |
Sedimentary Characteristics,Provenance and Tectonic Significance of the Sanmen Formation in Weihe-Sanmenxia Basin |
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| Abstract: | Sanmen Formation, deposited in Weihe basin and Sanmenxia basin, recorded the regional sedimentary history from Pliocene to Pleistocene. This formation is of great significance to understand regional paleoenvironment and basin evolution. The sedimentary facies analysis and source reconstruction of Sanmen Formation indicated a great environment changes in 2.8-2.6 Ma, Weihe basin changed from deep lake to shallow lake deposition in 2.8-2.6 Ma, with the water level decreasing, while Sanmenxia basin changed from fluvial facies to shore-shallow lake, with the water level rising. Combined with the results of paleogeomorphic reconstruction and regional stress inversion, Weihe basin and Sanmenxia basin were properbably independent with each other in Pliocene. In the Early Pleistocene, these two basins were connected. The water in Weihe basin flow into Sanmenxia basin, forming the Paleo-Sanmen Lake. By comparing the results of regional tectonic events and provenance analysis, it is concluded that the rapid uplift of Tibet Plateau may be the trigger force of the basin and regional drainage evolution. |
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