摘要
兰坪—思茅盆地是国内唯一发现古钾盐沉积的盆地。对云南兰坪—思茅盆地钾盐成矿背景作了总结与分析,指出中生代以来盆地经历了陆内裂谷形成到消亡、侏罗纪箕状断陷盆地发育、早白垩纪双断式断陷盆地发育、早白垩晚期干化成盐和后期挤压走滑几个阶段。在此基础上通过盐系地层沉积特征的分析,得到了盆地在成盐期(早白垩世晚期)构造活动强烈,由统一的湖盆解体为多个次级成盐盆地,盐类资源的沉积应该分属不同的沉积序列的认识。兰坪—思茅盆地成盐期构造背景分析对于了解该区蒸发岩矿床特征和成矿机理具有重要的参考意义。
Lanping-Simao basin is the only basin with ancient sylvite deposit in China. This paper made a summary and analysis for the tectonic background of salt-forming and sylvite-forming in Lanping-Simao basin. And the result shows that the development of Mesozoic basin has undergone the formation to disap-pearance of intracontinental rift, the stage of the Jurassic half-graben depression basin, the stage of the Early Cretaceous double downfauhed basin, the salinization and compressional strike-slip stages of the late Early Cretaceous, respectively. On this basis, we recognize that the intense tectonic movement developed during salt-forming stage （late Early Cretaceous） in Lanping-Simao basin, multiple secondary salt- forming basins formed through the disintegration of the unified paleolake, and deposited salts resources should belong to different depositional sequences, through the analysis of sedimentary characteristics of salt-bearing strata. It has important implication to investigate the tectonic setting during salt-forming of Lanping-Simao basin, then understand the characteristics of evaporite deposits and ore-forming mechanism.
出处
《盐湖研究》
CSCD
2016年第3期17-23,29,共8页
Journal of Salt Lake Research
基金
国家"973"计划项目第四课题"兰坪-思茅新生代残留盆地成钾条件
机理和后期演化"(2011CB403004)
关键词
兰坪—思茅盆地
钾盐矿床
成矿背景
Lanping-Simao Basin
Sylvite deposit
Ore-forming tectonic setting
