论文部分内容阅读
本文通过岩相特征、粘土矿物分布、早期成岩矿物组合、微量元素等特征的综合分析，认为民和盆地上侏罗统下部为一较典型的湿型冲积扇沉积。冲积扇扇中发育河道冲刷充填和漫流沉积，而泥石流不发育。沉积层序与现代湿型冲积扇可对比。扇体中粘土岩及早期成岩矿物组合中富含高岭石，应与扇体发育时的潮湿气候和弱酸性流体的较强的淋滤有关。由粘土岩中微量元素因子分析进一步表明，该地层中富硼、钒的特征与相邻非扇相地层明显不同
Based on the comprehensive analysis of lithofacies characteristics, clay mineral distribution, early diagenetic mineral assemblages and trace elements, the lower part of Upper Jurassic in Minhe Basin is considered to be a typical wet alluvial fan deposition. The alluvial fans develop scouring, filling and diffusing sediments, while the debris flow is not developed. Sedimentary sequences can be compared with modern wet alluvial fans. The clay minerals in the fan body and the early diagenetic mineral assemblages are rich in kaolinite, which should be related to the humid leaching of the fan body and the strong leaching of the weak acid fluid. Analysis of trace element elements in claystone further indicates that the boron-rich and vanadium-rich features in this formation are significantly different from the adjacent non-fan-phase strata