Sedimentary characteristics of microbialites of the North China type in mantou formation Cambrian, Henan
Based on the huge energy prospects, palaeo-environmental significance and calcification mechanism, the current study researched on the sedimentary characteristics of microbialites of 32 layers, and contrastively analyzed the related characteristics and evolution law of microbialites in the first, second and third member of mantou formation, in combining the associated sedimentary structure and lithofacies change. The results show that the layer and abundance of microbialites decrease from the first member to the third member, and stromatolites and texture stones are obviously superior in the first member but uniform stones are the principal components in the third member. The supply of terrigenous sediment (muddy) is the direct factor that leads to the morphology and sedimentary characteristics change of microbialites, while the change of sea level, namely water power, is the decisive factor that triggers the change of morphological characteristics of microbialites. Additionally, emergence of many met-azoan stimulates the extinction of microbialites. The study results in the following conclu-siongs: the microbialites of the north china type in mantou formation Cambrian are rich in Henan province, precisely 12 layers of stromatolites, 13 layers of texture stones, 2 layers of oncolites and 5 layers of uniform stones; The sedimentary characteristics of microbialites result from the internal factors (microbe) and external factors (environmental conditions).
microbialitesedimentary characteristicscontrolling factorsmantou formationHenan province
NETL
NSTL
万方数据
维普
