可可西里盐湖及其沉积特征初步研究

A Preliminary Study of Salt Lakes and Their Sedimentary Characteristics in Hoh Xil Region

中文关键词:  可可西里  盐湖  基本特征  古气候

英文关键词:Hoh Xil  Salt lake  Characteristic  Palaeoclimate

中文摘要:

      通过对可可西里地区盐湖的沉积学、地球化学和遥感学的研究，发现该地区盐湖的水化学类型多数为硫酸镁亚型，个别为氯化物型，而没有碳酸盐型盐湖。盐湖水化学特征为矿化度高，pH值中性到偏弱酸性，密度在1．10g／L左右；B—Li微量元素具有共生元素对属性，Sr-Ba、As-Hg等具反生元素对属性。盐湖中的锂、硼等物质很可能来自于与火山和断裂构造有关的地下热泉。沉积的盐类矿物主要为石盐、芒硝、无水芒硝，另有少量的水钙芒硝、白钠镁矾、方解石、石膏、菱镁矿等盐类矿物。依据现有数据和沉积剖面推测，可可西里最早的盐类沉积很可能达到60ka左右。

英文摘要:

      Based on sedimentologic,geochemical and remote sensing analysis of the salt lakes in Hoh Xil region,the authors discovered that most of the salt lakes are sulfate type,a few of them are chloride type and there is no carbonate type in hydrochemistry.The common evaporates are halite,mirabilite and thenardite,and there are a few quantity of hydroglauberite,bloedite,calcite,gypsum and magnesite.The depositional history of salt lakes is very short in Hoh Xil,which is only about 30 ka.According to the existing da...