摘要
位处青藏高原东北部、古亚洲构造域与特提斯构造域结合部位的柴达木盆地周缘地区,是一个具有复杂构造演化历史的多旋回复合造山区。同时,该区也是我国重要的、极富潜力的金属成矿带。在综合分析以往多年工作成果基础之上,较系统总结研究了区域成矿地质构造背景、区域构造演化、主要矿床类型、区域成矿规律与成矿系列。结果表明:该区地质构造演化主要经历了前寒武纪古陆形成、早古生代造山、晚古生代—早中生代造山和中新生代叠复造山等4个构造旋回。其中,早古生代和晚古生代—早中生代构造旋回与区内金属成矿关系密切;总结出6个主要矿床成因类型,分属于拉伸裂解构造背景的喷气-沉积矿床组合(包括VMS型、SEDEX型)和与造山过程有关的造山矿床组合(包括斑岩型、矽卡岩型、热液脉型、造山带型金矿等);该区成矿作用具有多期、多矿种和多类型的特点,初步总结划分出5个金属矿床成矿系列,即与新元古代—寒武纪裂解有关的铜多金属矿床成矿系列、与奥陶—志留纪裂解有关的铜钴铅锌多金属矿床成矿系列、与晚加里东陆-陆碰撞有关的金多金属矿床成矿系列、与晚古生代裂解有关的铜多金属矿床成矿系列、与晚华力西—印支期造山有关的铁铜铅锌金多金属矿床成矿系列。
The area around Qaidam basin in the northeastern Qinghai-Tibetan Plateau, located within the intersection between paleo-Asia and Tethyan tectonic domains, is a multiple orogen which underwent a very complicated evolutionary process, and is also a very important and potential metallogenic belt in Chi- na. Based on comprehensive analyses, the metallogenic setting, tectonic evolution, major deposit types, regional metallogenic rules and series in this area are described briefly in this paper. This area underwent four tectonic cycles including Precambrian old land formation, early Paleozoic orogenic activity, late Paleo- zoic-early Mesozoic orogenic process and Cenozoic overlap orogenic process. Of these, early Paleozoic and late Paleozoic-early Mesozoic orogenic activities were related genetically to metallic mineralization. Six types of deposits are recongnized including VMS and SEDEX types belonging to sedimentary exhalative de- posit assemblage, and porphyry, skarn, hydrothermal vein and orogenic gold deposit belonging to orogenic deposit assemblage. The metallic mineralization is characterized by multiperiod, multi-elements and multi- styles. Five metallogenic series of metallic deposits in the area are concluded, i.e. Cu-polymetallic deposit metallogenic series related to late Proterozoic-Cambrian splitting, Cu-Co-Pb-Zn polymetallic deposit metal- logenic series related to Ordovician-Silurian splitting, Au-polymetallic deposit metallogenic series related to late Caledonian collision, Cu-polymetallic deposit metallogenic series related to late Paleozoic splitting and Fe-Cu-Pb-Zn-Au polymetallic deposit metallogenic series related to late Variscan-Indosinian orogenic activity.
出处
《西北地质》
CAS
CSCD
2012年第1期1-8,共8页
Northwestern Geology
基金
国土资源部“百人计划”项目(200809)
国家自然科学基金项目(41172076、40302019)
中央级公益性科研院所基本科研业务费专项资金项目(K0901)
中国地质调查局地质调查项目(1212011085528,1212011121089,K1.1.3.1)
关键词
柴达木周缘
构造演化
矿床类型
区域成矿规律
成矿系列
area around Qaidam basin
tectonic evolution
deposit types
regional metallogenic rules
metallogenic series
