摘要
在湖北恩施利川地区的三叠系中统巴东组钙质砂质粘土岩及砂质泥质岩中,产出一种褐灰色粘土矿物。通过X射线粉末衍射、红外、热分析、化学分析及电镜观察等测试研究,各项实验数据证明该粘土矿物是三八面体绿泥石与三八面体皂石1:1规则间层矿物(绿间皂石)。自然风干样和各种化学处理样的00l衍射数据,都具有良好的整数倍关系。风干样00l衍射的标准偏差δ=0.1007,波动系数vc=0.347。d_(060)=1.531,b_0=9.19,c_0sinβ=29.05。并计算出了该矿物的化学结构式。
A trioctahedral chiorite/saponite (1:1) regularly interstratified clay mineral (C/Sap) is found in Lichuan area, Enshi county, Hubei province. Occurring in calcic-sandy clay rocks and sandy pelite of Triassic Badong Group, it has irregular scaled shape, with G=2.75, H=1-2, and n=1.558-1.572. Detailed chemical analysis, X-ray diffraction, infrared absorption, thermal analysis and electron microscopy all indicate that this mineral is made up of alternate trioctahedral cHorite and trioctahedral saponite layers, having d_(060)=1.531, b_0=9.19, and c_0sinβ=29.05. A good integral sequence of 001 diffraction obtained for the air dry sample suggests a regular interstratification, with δ=0.1007, vc=0.347_0 The chemical structural formula is(Mg_(0.26) Ca_(0.16) K_(0.09) Na_(0.03) H_(0.10))_(0.66) (Mg_(6.32) Al_(1.56) Fe_(0.48)^(3+) Fe_(0.15)^(2+))_(8.51) (Si_(6.47) Al_(1.56)_8O_(20) (OH)_(10) nH_2O.C/Sap of Lichuan resemble corrensite in IR spectra. Its wave numbers of absortion are 3670, 3556, 3415, 1630, 1080, 1002, 953, 898, 665, 650, 520, 460 and 445 cm^(-1). On DTA curve there are four endothermic effects(118℃, 235℃, 600℃, 820℃) and one exothermic effects (852℃). The total weight loss of C/Sap is 15.9％, of which dehydroxylation weight loss is 8.37％.
出处
《岩石矿物学杂志》
CAS
CSCD
1989年第3期251-260,共10页
Acta Petrologica et Mineralogica
关键词
缘泥石
皂石
缘间皂石
chlorite
saponite
regularly interstratified mineral
