中文摘要：

大宝山矿区位于南岭地区南部,中生代印支期-燕山期至少发生了两期褶皱作用,清楚地记录了自身的构造变形历史;为了解大宝山矿区构造演化提供了非常有利的条件。通过矿区内褶皱、石英脉、劈理、膝褶等变形构造的分析,首次识别了矿区内两个世代不同方向的褶皱构造的横跨叠加型式。发现早期褶皱（轴面走向NW-NNW向）形态较为紧闭,为斜卧褶皱;晚期褶皱（轴面走向为NE-NEE向）形态较为宽缓,为直立倾伏褶皱。结合大区域褶皱构造线的分析,提出华南地区横跨型叠加褶皱的早期褶皱应为近南北向,晚期褶皱为近东西向。基于矿区内多期变形构造的交切关系、石英脉辉钼矿年龄数据以及区域相关地质事件分析,这两组褶皱构造反映了大宝山矿区乃至华南地区中生代陆内两次变形事件：NW-NNW向褶皱是印支早期华南板块内部强烈构造-岩浆活动的结果;NE-NEE向褶皱是燕山早期华南板块陆内部变形作用的结果。大宝山矿区叠加褶皱变形研究不仅为研究华南大陆叠加褶皱变形特征提供了具体例证,而且对大宝山矿区多金属矿的勘探起重要指导作用。

英文摘要：

Dabaoshan polymetallic deposit is located at the middle part of the Nanling granite belt, South Chi-na ,which is a famous large deposit with a long history of mining. There has been at least two generations fold dur-ing Indosinian-Yanshanian, which records distinctly its history of tectonic evolution and is beneficial to research on tectonic regimes conversions. Based on the investigate of folds, quartz vein, cleavage and kink folds and analysis of structural deformation process in the ore areas, we can identify two generations of superimposed folds. The earlier NW-NNW trending fold relatively closed is oblique fold, while the later NE-NEE trending fold comparatively wide is erect plunging fold. Combined with the analysis of the large area structure line of fold, we put forward that the earlier fold axial of superimposed fold should be nearly north-south and the later fold axial should be nearly east- west in the South China. By paying attention to the multiphase deformation tectonic intersection relations and quartz-molybdenite veins age data at the mining area and related geological events in the region, we concluded that the superimposed folds of the ore area recorded the Dabaoshan polymetallic deposit and intra-continental deforma-tion event in South China of the Mesozoic. The NW-NNW folds were the result of tectonics and magmatic activities of South China during early Indosinian, while the NE-NEE trending folds were originated from the South China block internal cracking effect in early Yanshanian, rather than the subduction of the Pacific plate beneath the Eura-sian plate. To study on superposed deformation of Dabaoshan ore areas bears on importance for research on super-posed folds in this region, and takes an instructive action on polymetallic of the Northern Guangdong.