沉积地层中伊/蒙混层粘土矿物的晶体结构晶体化学研究
- 收稿日期:
1995-12-03
- 刊出日期:
1997-03-10
摘要: 不规则伊/蒙混层粘土矿物在沉积地层中广泛存在，通过对１７例伊/蒙混层粘土矿物样品进行系统研究得出：（１）沉积地层中的部分有序型伊/蒙混层矿物的晶层连接概率介于完全随机混层与机械混和物的连接概率之间；（２）伊/蒙混层中的蒙皂石晶层向伊利石的转化分两步完成：两层水蒙皂石单层水蒙皂石伊利石；（３）随着成岩作用的进行（埋藏深度增加），Ｉ/Ｓ中的Ｉ晶层含量增加，在此同时，Ｉ/Ｓ晶体结构中四面体片的类质同相代换增加，四面体电荷及总层电荷亦增加，匹配该增加部分电荷的是层间域Ｋ的含量明显增加；（４）在沉积地层中的Ｉ/Ｓ混层矿物中，Ｉ晶层具有白云母的成分特点，层电荷为０。７５左右；Ｓ晶层则具有纳蒙脱石的成分特点，层电荷为０。３０左右。
Crystal Structure and Crystallochemistry Study on Illite /Smectite Interstratified Clay Minerals in Sedimentary Strata
- China University of Geoseiences Wuhan 430074
- Received Date:
1995-12-03
- Publish Date:
1997-03-10
Abstract: Irregular illite/smectite interstratified clay minerals(I /S)occur frequently in sedimentary strata.Three pure I/S samples from the sedimentary strata in Xinjing, China are analysed in this paper, and it can be seen that the illite layer in I/S has the thickness of 1. 00 nm, but the smectite layer has two typesin thickness, that is，1. 5 nm for a smectite layer with two layers of interlayer water molecule and 1.25-1. 26 nm for a smectite layer with a single layer of interlayer water molecule. It〔an be concludedfrom the above results that, during diagenesis, the smectite layers in I/S transform to illite layer by twosteps, that is，smectite layer with two layers of interlayer water smectite layer with one layer of inter-layer water illite layer. It can also be seen that the layer linking probabilities of the I/S are betweenthose of wholly random interstratification and those of simplely physical mixture of two types of crystal-liter, i. e.，pII.I. PII.I,PII.I <1. 0. The structural formulae are calculated for I4 pure I/S samplesfrom the drills of the Fuyu oilfield in Olin Province according to their electron probe quantitative analyz-ing results. By regression analysis of 14 variables including elements and cbarge distribution among te-trahedral, octehedral, interlayer sheets of the I/S sampsles as well as X一ray diffraction results(ra ti o oftwo type layers) and the sample burial depth, it is concluded that along with the continuing of diagenesis(increasing of burial depths)，the contents of illite layers in I/S obviously incrase correlation coefficientbeing 0. 85)，and the substitutions of A1 for Si in the tetrahedral sheet and the tetrahedral charge as wellas the layer、barge also increase(the coefficients being 0. 77, 0. 077, 0. 085, respectively)·By plo t tingof the contents of Siversus K and Na+2Ca versus K per formula, it can be seen that the illite layer inthe I/S of sedimentary strata has a chemical co mpo sition chracteristic of muscovite with the layer charge of 0. 30of 0. 75, and the smectite layer has a〔hracter of montomorillonite with the layer charge of 0. 30
雷新荣, 刘惠芳, 陆琦. 沉积地层中伊/蒙混层粘土矿物的晶体结构晶体化学研究[J]. 沉积学报, 1997, 15(1): 98-103.
| 引用本文: |
雷新荣, 刘惠芳, 陆琦. 沉积地层中伊/蒙混层粘土矿物的晶体结构晶体化学研究[J]. 沉积学报, 1997, 15(1): 98-103.
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Lei Xinrong, Liu Huifang, Lu Qi. Crystal Structure and Crystallochemistry Study on Illite /Smectite Interstratified Clay Minerals in Sedimentary Strata[J]. Acta Sedimentologica Sinica, 1997, 15(1): 98-103.
| Citation: |
Lei Xinrong, Liu Huifang, Lu Qi. Crystal Structure and Crystallochemistry Study on Illite /Smectite Interstratified Clay Minerals in Sedimentary Strata[J]. Acta Sedimentologica Sinica, 1997, 15(1): 98-103.
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