摘要
绿泥石作为重要的粘土矿物已被广泛研究。然而,多数属于三八面体亚群。自从α-绿泥石、端铅绿泥石(Nagolnit)以及片硅铝石(donbassite)发现以后,才开始确认二八面体绿泥石的存在。
The authors discovered for the first time Al-rich dioctahedral chlorite and regular interstratified dioctahedral chlorite/montmorillonite,i.e.called tosudite,regular interstratified mica/chlorite and interstratified chlorite/montmorillonile from pyrophyllite deposit at Emei in Fujian province,pyrophyllite-kaolinite deposit at Liangao in Zhejiang province and kaolinite deposit at Xiagaozhou in Jiangxi province.The major reflection(003)at 4.7Å is stronger.The basal spacing d_((060))=1.49-1.50A does not change or increases slightly after treatment with ethylene glycol.The 14Å reflection decreases on heating up to about 300℃.The(001)reflection increases after heating at 550℃,and again(002)reflection appears at 7A.It is insoluble in 3N HC1.It is Al-rich in chemical composition with 1.0-2.5%Li2O mainly in lattice.Structure feature of tosudite is noted with long spacing d_((001))=28-29.5 A and regular in terstratification.d_((001))=30-32A after treatment with ethylene glycol.The d_((001))=22-23A after heating at 550℃.The structure feature of regular interstratified mica/chlorite is d_((001))=23.62A,d_((002))=11.85A,d(003)=7.80A.It does not expand on treatment with ethylene glycol.The dioctahedral chlorite and it’s interstratified minerals from pyrophyllite-kaolinite de-posites is an alteration product in volcanic rocks,but the dioctahedral chlorite and it’s interstratified minerals from bauxite deposit is an autogenetic mineral during or after diagenesis.
作者
张乃娴
杨雅秀
Zhang Naixian;Yang Yaxiu(Institute of Geology,Academia Sinica,Beijing;Institute of Geology of Geological co,Ministry of Industry,Beijing)
出处
《地质科学》
1986年第4期349-357,420,共10页
Chinese Journal of Geology(Scientia Geologica Sinica)
