Integrated stratigraphic regionalization of eastern China sea areas and adjacent land and their characteristics
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摘要:
中国东部海域地质历史上长期处于板块的结合部位,构造活动剧烈,地层发育特征复杂,一直是众多学者研究的焦点。海域和陆域地层研究程度不均衡,陆域资料多,研究程度高,而海域受各种条件限制,研究程度较低。此外,地层分区方案多针对陆域开展工作,迄今没有开展过统一的海域-陆域的地层分区,制约了对我国地层整体发育特征的深入认识。本文以近几年实施的1∶100万和更高比例尺的海洋区域调查成果资料为基础,开展了中国东部海域及邻域综合地层分区,系统研究了各地层分区中地层发育特征,重点研究了我国东部海域(台湾以北海域)中生代以来的地层特征和沉积演化历史。结果表明,我国东部海域及相邻陆域可以划分为1个地层大区(一级)、5个地层区(二级)和13个地层分区(三级);渤海海域主体位于华北平原分区,北黄海海域主要分布在辽东地层分区,南黄海海域主要属于下扬子地层分区,而东海和冲绳海槽主要位于东海陆架分区;中生代以来中国东部海域内各个盆地经历了复杂的构造-沉积演化过程,地层发育特征差异性明显。
Abstract:The geology of Eastern China seas has been the interest of scholars for a long time because of its complicated tectonic patterns and stratigraphic frameworks. However, the research level of stratigraphy is quite different from the sea to the land. Enormous data is available in the land area so that the research degree is quite high, while the degree of research in the sea area is low because of the restriction of various conditions. In addition, the stratigraphic regionalization is mainly done for land areas, no any sea-land unified classification of stratigraphic regions has been reached so far, which restricts the deep understanding of the stratigraphic development characteristics in the east part of China. Using the geological mapping data on scale of 1∶1 million and larger carried out in recent years, this paper made an integrated stratigraphic regionalization for the eastern China seas and adjacent areas. Systematic studies of the stratigraphic development characteristics are made with focus on the stratigraphic characteristics and sedimentary evolutionary history for the region to the north of Taiwan since Mesozoic. The results show that the eastern China seas and adjacent areas belongs to a first order stratigraphic region (Eurasian), 5 second order and 13 third level stratigraphic subregions. For the major sea basins, the Bohai Sea area belongs to the North China Plain stratigraphic region, and the North Yellow Sea the Liaodong stratigraphic region. The South Yellow Sea is mainly located in the Lower Yangtze stratigraphic region, while the East China Sea and the Okinawa Trough mainly located in the East China Sea stratigraphic region. Since Mesozoic, the basins in the eastern China Seas have suffered complicated tectonic-sedimentary evolution, and the stratigraphic development characteristics are obviously different. The results of this paper extend the stratigraphic regionalization from the land to the sea and the understanding of the stratigraphic characteristics in the east part of China is deepened.
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图 7 冲绳海槽地震反射特征 (海槽南部测线)[18]
Figure 7.
表 1 中国东部海域及相邻陆域综合地层分区方案
Table 1. Integrated stratigraphic regionalization scheme for eastern China Sea and its adjacent land areas
构造分区 地层分区 一级 二级 一级 二级 三级 欧亚板块(大陆) 华北-狼林陆块 欧亚地层大区 华北-狼林地层区(I) 燕辽地层分区 华北平原地层分区(渤海) 鲁西地层分区 鲁东地层分区 辽东地层分区(北黄海) 狼林地层分区 苏鲁-临津江造山带 秦-祁-昆地层区(Ⅱ) 苏鲁地层分区 临津江地层分区 扬子-京畿陆块 扬子-京畿地层区(III) 下扬子地层分区(南黄海) 京畿地层分区 江绍断裂带 江绍地层区(IV) 江绍地层分区 华夏地层区(V) 东南沿海地层分区 东海陆架地层分区 -
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