青海茶卡盐湖石盐中流体包裹体记录的古气候信息  

Paleoclimatic information recorded in fluid inclusions in halite from Chaka salt lake,Qinghai province

作　　者：葛晨东[1] 王天刚[2] 刘兴起[3] 孟凡巍[2] 刘吉强[2] 

机构地区：[1]南京大学海岸与海岛开发教育部重点实验室,南京210093 [2]南京大学成矿作用国家重点实验室,南京210093 [3]中国科学院南京地理与湖泊研究所,南京210008

出　　处：《岩石学报》2007年第9期2063-2068,共6页Acta Petrologica Sinica

基　　金：国家自然科学基金(批准号:40373016)

摘　　要：内陆干旱区形成的盐湖是研究过去气候变化的有效载体之一,而石盐中包裹体是揭示古气候的一种有效手段。青海茶卡盐湖是晚更新世晚期,逐渐演变形成的以石盐为主,固液相并存的综合性盐矿床。对茶卡盐湖钻孔样品中石盐的流体包裹体均一温度研究,揭示出从5ka 以来,盐湖水温总体上逐渐升高,从20℃～30℃升高到接近400℃,反映出古气候的温度是逐渐升高的,与全球变暖的总体趋势是一致的。研究表明,对石盐中原生单液相流体包裹体,采用冷冻-加热的方法测定均一温度,是获得盐湖古水温资料,进而恢复古气候变化的一种十分可信新手段,它在盐湖的研究方面具有广阔的应用前景。Salt lake from inland arid area is one of effective carriers for research of the ancient climate changes, and fluid inclusions in halite is a powerful mean to reveal the paleoclimate. Chaka Salt Lake in Qinghai Province is a comprehensive salt mine formed in Later Pleistocene, which is mainly composed of halite with coexisting solid and liquid. Study on the homogenization temperature of fluid inclusions in salt core samples from Chaka Salt Lake, indicates that the water temperature of salt lake is gradually elevated from 20℃- 30℃ in early stage to about 40℃ in late stage since 5ka. These results suggested gradually rising for ancient climatic temperature in Chaka area, which is consistent with general trend of the global warming. It is indicated that the homogenization temperatures obtained from primary single phase liquid fluid inclusions in halite （salt） by cooling-heating methods is an efficient new mean to acquire water temperature data of salt lake and thus to reconstruct the paleoelimatic changes. Fluid inclusion method will definitely have further wide applications in salt lake investigating field.

关 键 词：古气候信息 单液相流体包裹体 均一温度 石盐 茶卡盐湖 青海 

分 类 号：P641.69[天文地球—地质矿产勘探]