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前言根据砂岩粒度分析的数据作关于沉积物形成条件的解释,根据其中含重矿物特征特别是标型矿物的特征,对沉积物的物质来源进行解释,在地层学研究中已经得到愈来愈广泛的利用。本文就是在这方面所作的一个尝试。标本来自滇东下震旦统的七个剖面(图1)。根据野外资料剖面间的銜接关系,大致由下向上依次为:Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ、Ⅵ及Ⅶ。其中除Ⅵ、Ⅶ两剖面为确实的上下相接关系外,其余各剖面间均可能有局部的重复。
According to the data of sandstone particle size analysis, the interpretation of sedimentary formation conditions and interpretation of the material sources of sediments based on the features of heavy minerals, especially of standard minerals, have become more and more widespread in stratigraphic studies The use of. This article is an attempt in this area. Specimens come from the seven sections of the lower Sinian in eastern Yunnan (Figure 1). According to the cohesion relationship between the profiles of the field data, the order from top to bottom is: Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ, Ⅵ and Ⅶ. In addition to Ⅵ, Ⅶ cross-section is indeed up and down the connection, the rest of the cross-section may have some local duplication.