论文部分内容阅读
我国南方晚震旦世广泛发育有包括叠层石、层纹石和核形石等组成的微生物岩， 其中以叠层石最为普遍； 黔中地区的磷质叠层石总体上以层礁产出为特点， 其中的藻类微生物化石已被确定的有丝状和球状两大类共１７ 个种属， 而细菌微生物参与成岩成矿作用的证据也常能见到。微生物岩中的磷质主要富集在叠层石的柱体部位， 特别是富集在柱体的富藻纹层中； 从微生物的矿化特点看， 其成矿作用可分为直接的和间接的两种不同机制的类型。与同期形成的碳酸盐叠层石相比， 磷质叠层石， 无论在种类的多样性或发育程度上都显得丰富多彩得多， 这可能与磷质叠层石所处的有利环境， 特别是对营造叠层石的微生物的生长所需的富磷水介质环境密切相关。
Late Sinian in southern China, including the development of a wide range of strata, stratigraphic and stone-shaped rock microbial composition, of which the most common stratigraphic; Central Guizhou phosphorous stratigraphic reef production in general , Of which algae microbial fossils have been identified in both filamentous and globular altogether 17 species, and the evidence that bacterium microorganisms are involved in diagenesis and mineralization can often be seen. Phosphorus in microbial rocks is mainly concentrated in the columnar part of the stratum, especially in the algae-rich layer of the column. According to the mineralization characteristics of the microorganisms, the mineralization can be divided into direct and Indirect two different types of mechanisms. Compared with the carbonate monoliths formed in the same period, the phosphorescent monoliths are rich and colorful in terms of species diversity and development degree, which may be related to the favorable environment of the phosphorescent monoliths, In particular, it is closely related to the environment of phosphorus-rich aqueous medium required for the growth of stannicum-forming microorganisms.