摘要
北山造山带位于塔里木板块北部边缘,属于古亚洲构造区南带天山-兴安造山带中西段。区域地壳结构有基底结晶岩系(新太古界)和褶皱岩系(中新元古界),盖层为古生界,自上震旦统至二叠系基本连续出露。构造形态为一系列总体东西向向北突出的弧形大断裂分割的断块,断块内褶皱强烈。岩浆活动频繁,岩石类型复杂,花岗岩类可明显分出S、I型,基性-超基性岩可分出铁质和镁质,火山岩具裂谷火山岩特征,具有数条蛇绿杂岩,表明具有较好的成矿环境。本区矿床可分7大类:1与中酸性侵入岩有关热液矿床;2与火山岩有关热液矿床;3沉积变质矿床;4沉积矿床;5喷气沉积-改造矿床;6与基性-超基性岩有关岩浆矿床;7热液再造矿床。根据本区的成矿地质背景,包括地质条件、矿床分布、矿化分带性、遥感蚀变异常、地球化学异常及地球物理特征等,提出10个找矿远景区。
The Beishan orogen located along the northern margin of the Talimu massif belongs to the western-central portion of the Tianshan-Xing＇an orogen of the Paleo-Asia tectonic domain. The crustal components in the region include： late Archean crystallization basement, middle-late Proterozoic fold series and Paleozoic cover of upper Sinian to Permian stratigraphic system. Structure is characterized by fault blocks are divided by a series of arc-form faults in a east-west stretch. In side he blocks, there are intensive folds and active magmatism. Granites can be classified to I-and S-type, and mafic and ultramafic rocks are Fe-rich and Mg-rich kinds. Volcanics possess continental rift feature. A number of ophiolite zones have been found in the area. All these indicate an excellent metallogenic setting. Seven types of ore deposit have been reposted in the area： ①intermediate-acid intrusion-related hydrothermal ore deposit; ② volcanic hydrothermal ore deposit; ③meta-sedimentary ore deposit; ④sedimentary ore deposit; ⑤exhalative sedimentary reworked deposit;⑥basic-and ultrabasic magma-related ore deposit; ⑦hydrothermal reworked ore deposit. Ten target prospecting areas have been pinpointed according to detailed geolouical work.
出处
《西北地质》
CAS
CSCD
2006年第2期78-95,共18页
Northwestern Geology
基金
中国地质调查局"北山成矿带找矿重大疑难问题研究"项目(200310200021)
关键词
北山造山带
成矿特征
找矿方向
Beishan orogen
metallogenic characteristics
prospecting target
