论文部分内容阅读
中国西南地区的早泥盆世以碎屑岩沉积为主。中泥盆世和晚泥盆世早期随着海侵规模的扩大,出现了大量碳酸盐岩的沉积。在此期间,同沉积的断层十分活跃,导致了一系列近岸浅水台地、孤立的碳酸盐台地和深水盆地的分异。在台地内部和台地边缘底栖生物大量繁盛,碳酸盐岩沉积极为发育,并形成了规模不等、数量众多的生物礁。晚泥盆世晚期,中国西南地区发生海退,相应地出现了碎屑岩、浅水石灰岩和白云岩沉积。
Early Devonian in southwestern China is dominated by clastic sediments. With the enlargement of transgression in the middle Devonian and early Devonian, a large amount of carbonate sediments appeared. During this period, the synsedimentary fault was very active, resulting in the differentiation of a series of shallow offshore platforms, isolated carbonate platforms and deep-water basins. There are abundant benthic organisms in the interior of the platform and on the edge of the platform. Carbonate sediments are extremely developed and a large number of reefs are formed. Late in the Devonian, a regression occurred in the southwestern China, and correspondingly there occurred clastic rocks, shallow-water limestone and dolomite deposits.