论文部分内容阅读
一、引言从文献和杂志刊载的资料中说明:中国南部的桂、粤、湘、赣等省,均分布有所谓“龙山系”地层。该地层不易找到化石,变质程度又不一致。同是“龙山系”地层,在此地成为变质较深的片岩和片麻岩,而在彼地即变为轻微变质的千枚岩或板岩。产生这样变化的原因,尚未很好查明,可能是受早期(如加里东)花岗岩侵入的影响,使岩层产生深浅不同的变质带。前者往往容易和更老的地层混淆起来,误认为太古代的产物。例如:过去所谓华夏古陆基底的太古代片麻岩,现经野外工作证明;许多是属花岗岩的
I. INTRODUCTION According to the literature published in the literature and magazines, the so-called “Longshan system” strata are distributed in the provinces of Guangxi, Guangdong, Hunan and Jiangxi in southern China. The formation is not easy to find fossils, the degree of deterioration is inconsistent. The same is the “Longshan system” strata, where the metamorphic deep schist and gneiss, and in that area that has become slightly metamorphic phyllite or slate. The reasons for such changes have not yet been well identified and may have been affected by the invasion of early (eg Caledonian) granites, resulting in metamorphic zones of varying depth. The former tend to be confused with older strata and mistaken for the product of the Archean. For example, the so-called Archean gneiss from the so-called Cathaysian ancient continental basement have been proved by fieldwork; many are granite