苏皖地区凹凸棒石粘土矿床稳定同位素特征及其地质意义  

STABLE ISOTOPIC CHARACTERISTICS OF ATTAPUGITE CLAY DEPOSITS IN THE BORDER AREA BETWEEN JIANGSU AND ANHUI PROVINCES AND THEIR GEOLOGICAL IMPLICATION

作　　者：易发成[1] 李虎杰[2] 田煦[2] 郑自立[2] 

机构地区：[1]中国科学院地球化学研究所,贵阳550002 [2]西南工学院非金属矿研究所,绵阳621002

出　　处：《矿物学报》1995年第2期242-248,共7页Acta Mineralogica Sinica

基　　金：国家建材局行业基金;西南工学院科研基金

摘　　要：本文对凹凸棒石粘土矿中波缕石及其共生的蒙脱石、白云石、蛋白石进行了稳定同位素研究。波缕石δ18OSMOW为24．7‰～26．3‰，δDSMOW为－59.1‰～－106．2‰；蒙脱石δ18OSMOW为26．2‰，SDSMOW为－97．1％；蛋白石δ18OSMOW为15．3‰～16．8‰，推算形成温度为71～81℃。白云石δ43CPOB为－7．2‰—－11．7‰，δ18OSMOW为19．6‰～27．3‰，推算形成温度为29～74℃。研究表明，苏皖地区凹凸棒石粘土矿床是在火山喷发间歇期，与火山作用有关热水溶液参与下，在内陆湖盆淡水中形成。This paper deals with the stable isotopic compostions of palygorskite, montmorillonite,dolomite and opal in attapulgite clay deposits. The results are presented as follows: δ18OSMOW =24. 7‰ ~ 26. 3‰, δDSMOW = - 59. 1‰ ~ - 106. 2‰ for palygorskite; δ18OSMOW = 26. 2‰, δDSMOW= - 97. 1 %, for montmorillonite; δ18OSMOW = 15. 3‰, ~ 16. 8‰ for opal (the calculated forming tem-peratures 71~81 ℃); δCPDB = - 7.2‰~ - 11. 7‰,δ18OSMOW= 19. 6‰~ 27. 3‰ for dolomite (the calculated forming temperatures 29~ 74℃). The present study shows that at the intervolcanic eruption stage and under the action of hydothermal solutions related to volcanic activity, the atta-pulglte clay deposits in the border area of Jiangsu and Anhui provinces were formed in a low-salini-ty lacustrine basin.

关 键 词：粘土矿床 凹凸棒 稳定同位素 地质意义 

分 类 号：P619.231[天文地球—矿床学]