Geochemical Characteristics on Brine and Potash Perspective in the Western Tarim Basin

Key words: 
• western Tarim Basin /
• potash /
• characteristics coefficients of geochemistry /
• Potash perspective

Abstract: In the geological evolution of Tarim Basin, many transgressions and regressions of the ancient Teris〖KG*2〗happened, especially in the Cretaceous and Tertiary〖KG*2〗period, and brought〖KG*2〗plenty〖KG*2〗of salt sources.〖KG*2〗What's more, because of uttermost drought and proper sedimentary facies and paleogeography, many salt, gypsum, carbonate and mud-salt were〖KG*2〗deposited.〖KG*2〗By our fieldwork, above 300 samples were collected including brine and solid. Among these samples, 43 brine samples and 99 solid halite samples were analyzed. The item of analysis included K+,Na+,Ca2+,Mg2+,Cl-,SO2-4,CO2-3,HCO-3,Br-,B3+〖KG*2〗and so on. This paper discussed the variety of the content of K+〖KG*2〗and the characteristics〖KG*2〗coefficients of geochemistry, the model of salt formation, the concentration stage of brine and the possibility of potash formation by geochemical analysis of the brine from Tarim Basin. In the end, the potash perspective〖KG*2〗was proposed. From the geochemical parameters〖KG*2〗of brine in Western〖KG*2〗Tarim Basin, we could conclude that the perspective of potash〖KG*2〗is Kashi Sag and Yangxia Sag.〖KG*2〗By comparing the content of microelement〖KG*2〗and the geochemical parameters〖KG*2〗of brine with that of normal condensed brine, it is known that there is little microelements〖KG*2〗such as Br and B in Tarim Basin, so we could not completely depend on these indexes to judge the condense stage of brine and halite as well as potash〖KG*2〗resources, and this viewpoint indicates that Tarim Basin is the intricate area of salt formation.