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粤北是广东省晚古生代泥盆纪碳酸岩地层出露最广的地区之一。其中以中泥盆世和晚泥盆世沉积的碳酸岩发育最好,蕴藏有丰富的石灰岩矿和其他矿产。是广东省晚古生界以来重要的成矿时期。一、泥盆系碳酸盐岩分布概述层位及分布(附粤北地区泥盆纪地层分布简表):如表一,碳酸盐岩产于中、晚泥盆统,有三个层位:中泥盆统棋子桥组,上统余田桥组和锡矿山组。二、中、晚泥盆世碳酸盐沉积类型及其岩相特征 (一)沉积类型粤北地区在1:20万地质图上明显地表现为由上古生界所组成的两个互相连系的复向斜盆地。除去绝大部分属燕山期的侵入岩体而外,该区的构造格局是:分布于北边的是前泥盆系组成的诸广山复背斜,其西部成半岛形的前泥盆系经大瑶山向南延伸至乳源县境;该区南
Northern Guangdong is one of the most widely exposed areas of Late Paleozoic Devonian carbonate rocks in Guangdong Province. Among them, the carbonate rocks deposited in the Middle Devonian and the Late Devonian have the best development with rich limestone and other minerals. It is an important mineralization period since the Late Paleozoic in Guangdong Province. I. Overview of Devonian carbonate distribution Horizons and distribution (with a brief record of Devonian strata distribution in North Guangdong): As shown in Table 1, carbonate rocks occur in the middle and late Devonian with three layers : Middle Devonian Paiziqiao Formation, Yutongqiao Formation and Xiling Mine Group. MIDDLE AND LATE DECIPES CARBONATE SEDIMENTARY TYPES AND THEIR PHASE CHARACTERISTICS (Ⅰ) Sedimentary Types Northern Guangdong Province is clearly represented on the 1: 200,000 geological map as two interconnected systems consisting of the Upper Paleozoic Complex syncline basin. In addition to the vast majority of intrusive rocks belonging to the Yanshanian period, the structural pattern of the area is: the Guangsanshan anticline consisting of the former Devonian distributed in the north and the peninsula-shaped former Devonian in the west Dayaoshan extends south to Ruyuan County; the area south