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Crystal structure and crystallochemistry study on illite/ smectite interstratified clay minerals in sedimentary strata


, : Crystal structure and crystallochemistry study on illite/ smectite interstratified clay minerals in sedimentary strata. Acta Sedimentologica Sinica 15(1): 98-103

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. The analysis shows that the illite layer in I/S has the thickness of 1.00nm, but the smectite layer has two types in thickness, that is, 1.5nm for a smectite layer with two layers of interlayer water molecule and 1.25-1.26nm for a smectite layer with a single layer of interlayer water molecule. It can be concluded from the above results that, during diagenesis, the smectite layers in I/S transform to illite layer by two steps, that is, smectite layer with two layers of interlayer water to smectite layer with one layer of interlayer water to illite layer. It can also be seen that the layer linking probabilities of the I/S are between those of wholly random interstratification and those of simply physical mixture of two types of crystallites, i.e., P(I) < P(I.I),P(II,I),P(III,I) < 1.0. The structural formulae are calculated for 14 pure I/S samples from the drills of the Fuyu oilfield in Jilin Province according to their electron probe quantitative analyzing results.

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