| 珠江水系演化与东亚地形倒转的耦合关系 |
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| 引用本文： | 张向涛,向绪洪,赵梦,崔宇驰,张浩.珠江水系演化与东亚地形倒转的耦合关系[J].地球科学,2022,47(7):2410-2420. |
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| 作者姓名： | 张向涛 向绪洪 赵梦 崔宇驰 张浩 |
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| 作者单位： | 1.中海石油(中国)有限公司深圳分公司, 广东深圳 518054 |
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| 摘 要： | 新生代以来，全球地质演化中最大的地质事件不外乎青藏高原的形成及其环境效应，其中东亚地区的黄土堆积及大型水系的形成最为瞩目.珠江作为串联华南大陆与南海北部“源-汇”系统的纽带，是南海沉积学研究的焦点，揭示其形成过程对探讨云贵高原以及青藏东南侧的地形演变具有重要意义.采用元素地球化学与碎屑锆石U-Pb年龄谱系源汇综合示踪技术，结合珠江流域及珠江三角洲的研究成果，详细探讨珠江的诞生与演化历史.珠江河流体系初始形成于早渐新世，流域范围仅限于华南沿海地区；晚渐新世珠江发生向西拓展事件，流域面积显著扩大，达到云贵高原东侧边缘；到中新世珠江流域发生明显改变，河流进一步向西、向北溯源侵蚀，流域面积急剧扩大，深入云贵高原腹地.23 Ma珠江流域面积的快速扩展与同时期长江三峡贯通、北方黄土发育均是该时期青藏高原大范围隆升的直接产物，是东亚地区基本形成西高东低地貌特征的具体反映.
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| 关 键 词： | 珠江演化 南海 东亚地貌 地形倒转 青藏隆升 海洋地质学 |
| 收稿时间： | 2021-10-01 |
Coupling Relationship between Pearl River Water System Evolution and East Asian Terrain Inversion |
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| Abstract: | The Tibetan Uplift and its corresponding environmental effect are widely considered as one of the most significant global geological events during the Cenozoic. Specifically, the generation of loess and continental-scale drainage networks within the East Asia has attracted increasing attention. As the link connecting the South China Continent and the northern South China Sea (SCS) of the "source-to-sink" system, the Pearl River is the focus of sedimentology and petroleum geology research. Its evolutionary process and controlling factors are of great significance in revealing the landform development of both Yunnan-Guizhou Uplift and SE Tibetan margin. Based on the combination of elemental geochemistry and detrital zircon U-Pb dating results, in this paper it provides a research synthesis of the Pearl River tributaries and the Pearl River Mouth Basin to unravel the birth and development history of the Pearl River system in detail. The Pearl River system was initially formed in the Early Oligocene, and the drainage basin was limited to the South China coastal areas. In the Late Oligocene, the Pearl River eroded westward greatly reaching the eastern margin of the Yunnan-Guizhou uplift. Since the Miocene, the Pearl River largely expanded westward and northward, and deeply cut across gorges within the hinterland of the Yunnan-Guizhou uplift. Since then, the Pearl River has established its general framework over the South China Continent. The rapid expansion of the Pearl River at the Oligocene/Miocene boundary (23 Ma) is in consistence with the contemporaneous Three Gorges connection of the Yangtze River and the loess formation. These events are not only closely related to the dramatic uplift of the Tibetan Plateau during this time, but also substantial geological records of the west-high-east-low landform generation in the East Asia region. |
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