东营凹陷自生粘土矿物特征及其与盆地演化的关系

<title>atures on authigenic clay minerals in the Dongying depression and their relation to the basin evolution.

东营凹陷中自生粘土矿物的特征在空间上呈现出规律性的变化。随着深度的增加,粘土矿物组合从蒙脱石和高岭石-R0型伊蒙混层矿物和高岭石-R1型伊蒙混层矿物和高岭石-R3型伊蒙混层矿物、高岭石和绿泥石-伊利石和绿泥石,伊利石类矿物中伊利石的组分逐步增加,矿物种类从蒙脱石-R0型伊蒙混层矿物-R1型伊蒙混层矿物-R3型伊蒙混层矿物-伊利石。从凹陷的边部向中部,粘土矿物也表现出同样的变化规律。凹陷边缘中生代地层中的自生粘土矿物特征反映东营凹陷甚至整个济阳坳陷是在中生代地层基础上逐步拉张、沉积形成的。

<abstract>aracteristics of authigenic clay minerals in Dongying depression show a regular spatial change. The clay mineral assemblages change from smectite and kaolinite, random I/S ( R = 0) and kaolinite, allevardite I/ S (R = 1) and kaolinite, kalkberg I/S (R≥3) , kaolinite and chlorite, and then to illite and chlorite with the increasing depth. The proportion of illite (I) layers in mixed-layer smectite/illite (I/S) minerals progressively increases and the mineral types transform from smectite via R=0, R =1, R=3, and to illite. The clay minerals in the same strata also show the same changes from the edge to the center of the Dongying depression. The characteristics of authigenic clay minerals in Mesozoic strata in the edge of the depression reflect that the Dongying deprssion as well as Jiyang depression were formed through progressive extension and deposition of Mesozoic strata.