罗定地区震旦纪地层中变质砾岩的地质特征

GEOLOGICAL CHARACTERISTICS OF THE METAMORPHIC CONGLOMERATE IN SINIAN STRATIGRAPHY IN THE LUODING AREA,THE WESTERN GUANGDONG

根据岩石学、矿物学、微量元素、古生物以及变质砾岩的形态特征等多方面研究表明 ,粤西罗定地区老鼠峡震旦纪变质地层中出露的厚层状变质砾岩为一套成分比较单一 ,属沉积成因并经构造改造的变质底砾岩。底界相当于中国南方的南沱组的底界 ,为广东省境内早。

Based on the study of petrology,mineralogy,microelements,palaeontology and geological occurrence characteristics,the authors hold that the thick beded metamorphic conglomerate in Sinian strata in Laoshouxia,Luoding area of westren Guangdong province,is a sedmental basal conglomerate with simple component suffered structural deformation.Its bottom surface is corresponding to one of Nantou Formation in South China,and is the structural surface of Chengjiand movement between early to late Sinian period in Guangdong region.