ABSTRACT

The North China Craton contains voluminous gold deposits, which occur within the Northern Margin Gold Belt, the Southern Margin Gold Belt, and the Jiaodong Gold Province. However, relatively little is known of the gold deposits in the E–W-trending Northern Margin Gold Belt, which hosts 66 deposits with total reserves of >1000 tonnes. Based on a systematic summary of the geological features and ages of ore formation, three periods of gold mineralization can be distinguished: Permian–Triassic, Jurassic, and Early Cretaceous. Permian–Triassic gold mineralization occurs mainly as E–W-trending orogenic gold deposits with minor intrusion-related mineralization, formed in a syn- to post-collisional setting associated with closure of the Paleo-Asian Ocean. The Jurassic gold deposits occur in central and eastern parts of the Northern Margin Gold Belt as intrusion-related gold deposits that formed in a compressional setting associated with subduction of the Paleo-Pacific Plate. Early Cretaceous gold deposits in the eastern part of the Northern Margin Gold Belt are also intrusion-related, and formed in an extensional setting associated with rollback of the Paleo-Pacific Plate.

摘要

华北克拉通蕴藏着大量的金矿，这些矿床分布在北缘金带，南缘金带和胶东黄金省内。但是，对处于E-W趋势的北缘金矿带的金矿藏知之甚少，该地带拥有66个矿藏，总储量> 1000吨。根据对地质特征和矿石形成年龄的系统总结，可以区分三个金矿化时期：二叠纪—三叠纪，侏罗纪和早白垩世。二叠纪-三叠纪金矿化主要发生在与E趋势有关的造山金矿中，与入侵相关的矿化程度较小，形成于与古亚洲海洋关闭相关的碰撞后环境中。侏罗纪金矿床是北缘金矿带的中部和东部，是与侵入有关的金矿床，形成于与古太平洋板块俯冲有关的受压环境中。北缘金带东部的早白垩纪金矿也与侵入有关，形成于与古太平洋板块回滚有关的伸展构造中。