| 樊航宇,张树栋,黄猛,张晓飞,周长红.天津市北部尔王庄地区末次盛冰期下切河谷特征[J].地质找矿论丛,2020,35(4):447-453 |
| 天津市北部尔王庄地区末次盛冰期下切河谷特征 |
| Characteristics of the Incised-Valley of the latest glaciation peak period at Erwangzhuang district in the north Tianjin |
| 投稿时间：2020-08-24 |
| DOI：10.6053/j.issn.1001-1412.2020.04.010 |
| 中文关键词: 下切河谷 末次盛冰期 沉积相 渤海湾西岸 天津市 |
| 英文关键词:incised-valley latest glacial peak period sedimentary facies West coast of Bohai Bay Tianjin |
| 基金项目:天津国土局项目"天津黑狼口乡等四幅1∶5万区域地质调查"（编号：国土房任（2014）19号）资助。 |
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| 中文摘要: |
| 渤海湾西岸尔王庄地区钻孔岩芯、微体古生物、孢粉及14C测年等资料及联合地质剖面研究结果表明，末次盛冰期全球海平面下降使该地区形成下切河谷，冰后期海平面迅速上升引发的海侵造成古河谷的充填，依次形成河床相、河漫滩―河口湾相和三角洲相，与相邻的滦河扇三角洲下切河谷有差异，该下切河谷受海河水系控制，流向大致与古潮白河一致。其演化过程受海平面变化、构造运动和古气候等因素影响，经历了末次盛冰期深切、15~7 ka BP海侵期间河床相及河漫滩―河口湾相的充填和之后海退形成的三角洲相埋藏等三个阶段。 |
| 英文摘要: |
| Study on data of drilling cores, micropalaeontology, pollen, 14C dating and the integrated geological section of Erwangzhuang district in the Western Coast Bohai Bay show that the global sea level drop leads to incised-valley in this area, the post-glacial rise of sea level caused by transgression resuls in filling of the palaeo-valley to form in turn river bed, floodplain-estuary and delta sedimentary facies. The valley differs from that of the neighboring Luanhe fan delt. It was controlled by the Haihe river system with flow direction roughly coincided with the ancient Chaobaihe river. Under influenc of sea-level change, tectonic movements and ancient climate and other factors it evolved in three stages:1)deep incision at the latest glacial peak period; 2)river bed, floodplain-estuary and delta sedimentary-facies filling sedimentation during 15~7 ka BP; 3)regression burial of the delta. |
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