摘要
四川盆地早、中三叠世共有六次成盐期,形成二十多个大小不等的盐盆。通过统计大量含盐钻井的盐岩层位、厚度、分布及含钾情况,圈定了各成盐期次盐盆的分布范围和成盐中心。盐盆范围与成盐中心清晰地显示：四川盆地早三叠世嘉陵江期末至中三叠世雷口坡期初（T1j^5-T2l^1-1）,和中三叠世雷口坡期末（T2l^4）,分别在盆地东北部和西部,进入高盐度化成盐环境,具备成钾条件。盐盆的这一时空格局是印支运动江南古陆和龙门山之间差异性推覆、挤压下,补偿盆地的轴线不断向西方向迁移的结果,同时表明盆地迁移演化过程中,成钾环境发生于盐化旋回中嘉四段、嘉五段和雷四段等时段持续干旱的＂气候窗＂与潮坪上一些小＂盐盆窗＂的耦合。
There were six salification periods,during which more than 20 salt basin with various were formed in the Sichuan Basin size in early Middle Triassic.Based on a large number of statictic on the horizon,thickness,distribution and contents of potassium of the salt boreholes,this paper delineates the distribution of salt basins and centers of salification in each period,which clearly displays eastern Sichuan might have been supersaline and potassium environment from early Triassic late Jialingjiang phase to middle Triassic early Leikoupo phase（T1j^5-T2l^1-1）.Corresponding,western Sichuan also might have been that in middle Triassic late Leikoupo phase（T2l^4）.The Triassic space-time structure of salt basins in Sichuan was a resuct of migration of axis of the basin toward west under different overriding and compression coming from Jiangnan oldland and Longmengshan.Meanwhile,the potassium environment happened under the interconnection of continuous dry climate fragments（T1j^4-5、T1j^5-2 and T1l^4-2）in saline cycle the and salt basins window on the strandflat.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2015年第11期1945-1952,共8页
Acta Geologica Sinica
基金
国家重点基础研究发展计划"973"项目"中国陆块海相成钾规律及预测研究"(编号2011CB403005)资助成果
关键词
四川盆地
三叠纪
盐盆
沉积中心
Sichuan basin
Triassic
salt basin
depositional center
