华北地块北缘铅锌矿床类型、地质特征及构造演化

本文重点对华北地块北缘铅锌矿类型、特征、时空分布等进行了初步总结, 并探讨了铅锌成矿作用与区域构造演化的关系。通过初步总结认为, 该地区铅锌矿床的主要成因类型有SEDEX型、矽卡岩型、岩浆热液型、沉积改造型、MVT型及复合型等。从形成时间来看, 矿床主要形成于中元古代、晚古生代和中生代三个时期, 并在中元古代和中生代达到高峰。中元古代以形成SEDEX型、沉积改造型和MVT型矿床为主, 该时期处于被动陆缘基础上发育的裂谷环境; 晚古生代产出少量岩浆热液型铅锌矿床, 其形成可能为华北地块与西伯利亚南缘蒙古增生褶皱带拼合后的伸展及岩石圈拆沉作用有关; 中生代为岩浆热液型、矽卡岩型铅锌矿床的重要成矿期, 该时期主要发育陆内构造运动, 可能为欧亚构造动力学体系与西太平洋动力学体系复合、叠加作用的结果。

Types, Characteristics, and Tectonic Evolution of Pb-Zn Deposits on the Northern Margin of the North China Block

In this paper, the authors provide an overview of the types, characteristics, and temporal-spatial distributions of the Pb-Zn deposits on the northern margin of the North China Block, and try to relate these deposits to the tectonic evolution of the North China Block, based on the data from both the documents both in China and abroad. The major ore deposits are of SEDEX, skarn, hydrothermal, sediment-reformed, MVT, and complex types. Large-scale mineralizations occurred notably in the Mesoproterozoic, Late Paleozoic and Mesozoic and reached the peak in Mesoproterozoic and Mesozoic. The Mesoproterozoic was a productive period for SEDEX, sediment-reformed, and MVT Pb-Zn deposits. These deposits were mainly formed in the rift of the passive continental margin. The Late Paleozoic period formed a small number of hydrothermal Pb-Zn deposits as a result of the extending and delamination after the amalgamation between the North China Block and the Mongolia fold belt on the southern margin of the Siberia block. The Mesozoic was a significant metallogenic period for hydrothermal and skarn deposits. These deposits were mainly formed in intracontinental tectonic settings resulting from the superposition of Eurasian and western Pacific Ocean dynamic systems.