| 引用本文: | 王燚, 董磊, 杨学俊, 陈东升, 吕志伟, 叶春林, 韩飞, 黄波, 贾小川.青藏高原南部邛多江盆地新建更新统洛村组地层特征及意义[J].沉积与特提斯地质,2021,41(1):33-40.[点击复制] |
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| 青藏高原南部邛多江盆地新建更新统洛村组地层特征及意义 |
| 王燚,董磊,杨学俊,陈东升,吕志伟,叶春林,韩飞,黄波,贾小川 |
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(1. 四川省地质调查院 稀有稀土战略资源评价与利用四川省重点实验室, 四川 成都 610081;
2. 中国地质调查局成都地质调查中心, 四川 成都 610081;
3. 四川省地质矿产勘查开发局物探队, 四川 成都 610032) |
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| 摘要: |
| 错那-沃卡裂谷是青藏高原南部的众多新生代南北向裂谷之一，该裂谷中段的邱多江盆地沉积了大面积的第四纪湖相沉积物。此前由于地质调查程度较低，古湖积物的地表调查工作基本属于空白。本次调查对洛村-邛多江盆地古湖积物进行了详细研究，在洛村地区发现了完整的古湖积物的连续沉积，测制了地层剖面，开展了精确的光释光定年分析，结果显示其沉积时代为上更新世。鉴于区域上该套更新世地层出露面积广、厚度大，故新建地层单元，定名为洛村组（Qp3lc）；并推测邱多江-洛村古湖可能是雅鲁藏布江中部超大古堰塞湖的一部分，洛村组是由藏南地区错那-沃卡裂谷和古大湖共同作用形成，初步计算了古湖出水口、湖面高度、湖水面积等参数。 |
| 关键词: 洛村组 邛多江盆地 上更新世中阶 古湖积物 |
| DOI：10.19826/j.cnki.1009-3850.2020.06004 |
| 附件 |
| 投稿时间：2020-03-14修订日期：2020-05-10 |
| 基金项目:国家重点研发计划“青藏高原碰撞造山成矿系统深部结构与成矿过程”(编号：2016YFC0600308)、“中国地质调查局冈底斯-喜马拉雅铜矿资源基地调查项目”(DD20160015) |
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| The Luocun Formation, a newly established Pleistocene stratigraphic unit in Qiongduojiang basin, southern Tibet |
| Wang Yi, Dong Lei, Yang Xuejun, Chen Dongsheng, Lü Zhiwei, Ye Chunlin, Han Fei, Huang Bo, Jia Xiaochuan |
(1. Evaluation and Utilization of Strategic Rare Metals and Rare Earth Resource Key Laboratory of Sichuan Province, Sichuan Geological Survey, Chengdu 610081, Sichuan, China;
2. Chengdu Center, China Geological Survey, Chengdu 610081, Chengdu, China;
3. The Geological Prospecting Team of Sichuan Geological & Mineral Bureau, Chengdu 610032, Sichuan, China) |
| Abstract: |
| Though out detailed geological mapping, profiles' measuring, and optical stimulated luminescence dating, we named a new Pleistocene stratigraphic unit Formation, the Luocun Formation in the Qiongduojiang basin, southern Tibet. The Luocun Formation is mainly composed of lacustrine deposits such as clay, sand and gravel. It was a product of the paleo Yarlung Zangbo Jiang lake which was formed by the clogged Yarlung Zangbo River from 0.025Ma to 0.078Ma. During that time, the Luocun basin, in which the Luocun Formation occurred, was a part of the Yarlung Zangbo paleo-lake caused by activities of glacier and geological slides in the studied areas. Parameters such as its outlet, height, and lake surface of the Yarlung Zangbo paleo-lake are also preliminarily calculated in this paper. |
| Key words: Luocun Formation Qiongduojiang Basin Pleistocene Intermediate Paleolake sediments |