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从岩石地层、生物地层、年代地层等方面对粤北韶关-连平地区进行了多重地层划分对比研究,重点研究了沉积地层的古地理环境,确定出晚古生代两个同期异相的沉积堆积区,并从“兴梅混合岩田”中解体出早中元古代桃溪岩组。通过锆石U-Pb定年,重新厘定志留纪不同侵入期次的花岗岩。对分布于粤赣边界细坳片麻状二长花岗岩体进行锆石岩相学与年代学研究,获取的锆石SHRIMP U-Pb年龄为742.3±9.3 M,反映研究区内存在晚元古代过铝质花岗岩浆的侵入事件。研究认为四会-吴川断裂带自四会-清新一带进入研究区,与英德-始兴断裂组相接,并形成宽大的硅化岩带。将大东山-贵东复式岩体解体为17个时代岩性单位,认为不同侵入期次的侵入岩中以中侏罗世-早白垩世黑云母二长花岗岩W、Sn含量为最高,是作为钨锡及多金属的主要含矿载体。
From the aspects of lithostratigraphy, biostratigraphy and chronostratigraphy, the stratigraphic division of multiple strata in Shaoguan-Lianping area of Yuebei is comparatively studied. The palaeogeographic environment of the sedimentary strata has been studied emphatically, and two late-Paleozoic sedimentary accumulation zones have been identified , And from the “Xing Mei mixed rock field” in the early Middle Proterozoic Taoxi rock group. By U-Pb dating of zircons, the granites of different intrusions in the Silurian are re-determined. Based on zircon petrography and geochronology, the SHRIMP U-Pb zircon ages of the fine gneissic monzogranites distributed on the border of Guangdong, Jiangxi and Karnataka are 742.3 ± 9.3 M, which reflect the presence of Late Proterozoic Aluminum granite magma intrusion. The study suggests that the Sihui-Wuchuan fault zone entered the study area from Sihui-Qingxin area, connected with Yingde-Sihing fault group and formed a large silicified rock zone. The Dadongshan-Guidong complex rock mass is disintegrated into 17 lithologic units. It is considered that the W and Sn contents of Middle Jurassic-Early Cretaceous biotite monzogranite are the highest in intrusive rocks of different intrusions, Tungsten and tin and the main metal-bearing multi-metal carrier.