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上扬子地区在三叠纪时发育为宽阔的浅水台地(图1),在其四周有一系列古陆及隆起。主要有西北部及西部的龙门山岛状叠合古陆和康滇古陆;南部的黔南海脊;东部及东南部的江南古陆和九岭海隆;东北部及北部的大巴山海隆和汉南海隆。总计面积约25万km~2。在早、中三叠世交替沉积了一套碳酸盐岩与蒸发岩地层,几十年来,我国地质工作者在这一地区作了大量的调查研究及钻探工作,发现了很多找钾线索。特别是最近几年,在川东北地区先后发现了富钾卤水、杂卤石层和无水钾
The Upper Yangtze region developed into a broad, shallow water platform during the Triassic period (Figure 1), surrounded by a series of ancient landforms and uplifts. Mainly in the northwestern and western Longmenshan islands superimposed ancient continent and Kang Dian ancient land; southern Qiannan ridge; eastern and southeastern Jiangnan ancient land and Jiulong seamounts; northeastern and northern Dabashan seamounts and Hannan seamounts . The total area is about 250,000 km ~ 2. In the early and middle Triassic, a set of carbonate rocks and evaporite formations were alternately deposited. For decades, Chinese geologists have done a lot of investigation and drilling in this area and found many clues to find potassium. Especially in recent years, in the northeastern region of Sichuan have found a potassium-rich brine, polyhalite layer and potassium