四川盐源盐矿成盐成钾分析预测

四川盐源盆地盐矿成盐于早、中三叠世时期,区域构造复杂,经历多期次的构造变动与演化,在成盐后经历了种种的基底反复变动后形成盐矿底辟构造。以前在该区域做过多方面的研究工作,其中包括三叠纪岩相古地理及生物古地理、三叠系地层、区域古构造演化及水化学分析、物探、钻探等勘探工程。通过这些工作可以证实,盐源盆地在早、中三叠世,经历了蒸发岩盆地的发育阶段。盆地不仅发育有石膏夹层,而且保存有石盐层及含盐卤水层,但有盐无钾。通过对上覆的陆相古近纪和新近纪盆地中出现的三叠系岩盐层和盐丘的研究发现,它们与基底为含盐的海相蒸发岩有一定的内在联系,尽管还不能确定其盐、钾资源前景,但可以确定该区域有成钾盐矿藏的条件和可能,因此,该盆地有可能成为深入研究成盐找钾的重点地区。

Salt- and Potash-forming Analysis and Forecast of the Yanyuan Salt Mine in Sichuan Province

Abstract: The salt mines in the Yanyuan Basin, Sichuan Province formed in the early to middle Triassic period. This region has complicated structure, and experienced multi-episodes of tectonic deformation and evolution. It has undergone a variety of basement changes to form salt diapir structures after the salt deposits formed. There have been many studies on Triassic lithofacies paleogeography and biological paleogeography, Triassic strata, regional paleotectonic evolution and hydrochemistry analysis, geophysical exploration, drilling and other exploration projects in this region. These data suggest that the Yanyuan basin has experienced the developmental stage of an evaporite basin in the early-middle Triassic period. This basin contains gypsum interbeds where developed, rock salt layers and salt-bearing brine layers, but without potash. The Triassic rock-salt layers and salt domes in the overlying continental Eogene and Neogene basins indicate their relationship to the basement of salt-bearing marine evaporite. Despite the salt and potash resource prospects in the basin can not be determined yet now, the conditions and possibility of potassium salt deposits formation in this region are undoubted. Therefore, this basin is likely to become a focus area of in-depth study on salt formation and potassium search.