江苏盱眙凹凸棒石粘土含矿层的岩石地球化学研究  

PETROGEOCHEMISTRY OF LATE TERTIARY BASALTS INTERBEDDED WITH PALAGO-RSKITE CLAY IN XUYI, JIANGSU PROVINCE-EVIDENCE FROM FIXED AMMONIUM

作　　者：郑自立[1] 田煦[2] 易发成[2] 李虎杰[2] 黄文涛 

机构地区：[1]中南工业大学地质系,长沙430073 [2]西南工学院非金属矿研究所,成都621002 [3]山东大学化学系,济南250000

出　　处：《地质地球化学》1997年第1期24-31,共8页Geology-Geochemistry

摘　　要：玄武岩岩石学、岩石地球化学研究表明，盱眙地区晚第三纪玄武岩为大陆碱性橄榄玄武岩，为具有相似的上地幔岩浆源区多期次喷发旋回的产物；玄武岩岩石化学成分表现出与区域相反的变化趋势，即由钙碱性向碱钙性方向演化。玄武岩的风化作用过程分两个阶段进行，风化作用晚期发生蒙脱石的凹凸律石粘土化转变。Petrological and petrogeochemical studies of basalts indicate that the Late Tertiary basalts in the Xuyi area belong to continental alkaline olivine basalts and they are oonsidered to be the products of multi-episodic eruptive cycling of magmas from similar upper mantle source regions. Petrogeochemically the basalts show an opposite trend of variation against the region, i. e., a trend of evoution from calc-alkalirie to alkalic-calcareous. The weathering of basalts involves two stages and at the late stage of weathering montmorillonite was clayized into palagorskite.

关 键 词：玄武岩 岩石学 地球化学 凹凸棒石 粘土矿物 

分 类 号：P578.94[天文地球—矿物学] P584[天文地球—地质学]