云南南沱组杂砾岩的成因及沉积相

作者对滇中震旦系,特别是下震旦统南沱组紫红色杂砾岩的成因和南沱期沉积相进行了较深入的研究,认为云南的南沱组杂砾岩既不是冰川搬运物质直接堆积的,也不是单纯的泥石流成因,而是兼具两者的某些特征。其沉积相的展布有从陆到海、从浅到深的特征。

SEDIMENTARY FACIES AND ORIGIN OF PURPLISH RED DIAMICTIIES OF NANTUO FORMATION(LOWER SINIAN)IN YUNNAN

The purplish red conglomerate in the lower part of Nantuo formation of the Lower Sinianseries in Yunnan remanis glacial evidences, meanwhile there are more non-glacial evidenes. The au-thor thinks that the Nantuo glacial stage existed, but the Nantuo formation in Yunnan was not directlyleaped by glacial transportation. It was redeposited by detrital flow and tractional current modifyingthe glacial sediments. In the middle part of Yunnan the Nantuo formation occures as typical fluvialfan delta facies and to the southeast of Yunnan, as shoreline glacial gray conglomerate facies, shelfgray conglomerate facies, slope gravel mud stone, gray conglomenate facies.