古盐度计算与古地理恢复在塔里木盆地钾盐勘探中的应用

探讨非传统方法在塔里木盆地寻找钾盐,尝试通过古盐度计算和古地理恢复来确定(漏)湖相沉积中心,同时结合元素地球化学特征分析与古地理、古盐度的耦合关系,对塔里木盆地固体钾盐矿有利发育区进行预测,认为发育深水(漏)湖相的大宛其地区岩盐体最厚,古盐度值、K+含量和澳氯系数也最高,并从深水(漏)湖→浅水(漏)湖→(漏)湖边缘呈逐...

Application of paleosalinity calculation and palaeogeographic reconstruction to explorating potash salt in Tarim Basin

Tarim Basin is one of the most important and alive ancient potash mine exploration areas.In the past researches,the studies mainly focused attention on the characteristics of element geochemistry,and the traditional methods were difficult to find potassium.This article tries to define the depocenter of lagoon facies halite by palaeosalinity calculation and palaeogeographic reconstruction.Combined with the coupling relationship of element geochemistry characteristics,palaeogeography,and palaeosalinity,the author predicts the beneficial area for ancient potash mine and considers the Dawanqi area where deep-water lagoon facies develop has the thickest halite,highest palaeosalinity,K+ content,and coefficient of Br and Cl.All of these present a decline trend from deep-water lagoon,shallow lagoon to the edge of lagoon.According to multidisciplinary analysis,the author considers that the Dawanqi area in Kuche Basin has superior forming-potassium conditions,and it should be the optimum exploration target of ancient potash mines in Tarim Basin.