论文摘要
The peripheral zone of Songliao bolck has been affected by the activities of North China Plate, Siberia Plate and Pacific Plate for a long time, and has formed multiple periods of magmatic rock intrusion events. Especially after getting into Mesozoic era, frequent intrusion activities have formed a large number of deposits related to intrusive rock. Therefore, Mesozoic era is also known as "Metallogenic era". According to the characteristics of Mesozoic intrusive rock periphery of Songliao bolck and the relationship with ore-forming. Divide it into two intrusive rock provinces, three intrusive rock zones and seven ore-forming series. Taking the Nenjiang fault as the boundary, divid the Songliao fault into two intrusive rock provinces, Great Khingan Mountain and Hejiliao. The Heigliao intrusive rock province is divided into the Lesser Khingan Mountain intrusive rock zone in the north, the Changbai Mountain intrusive rock zone in the east, and the Qilaotushan intrusive rock zone in the south,basing on TaxiLinkou Fault, Shenyang-Xunke Fault（the north of Tanlu Fault） and Chifeng-Kaiyuan Fault.（1） Triassic-Jurassic polymetallic ore-forming series related to intermediate-acid-alkaline magmatic intrusion. Indosinian movement, early Yanshan movement and the continued subduction of the North American plate to the Eurasian plate provide a favorable environment for magma intrusion in the region,thus forming many intrusive rock polymetallic deposit or polymetallic deposits after the late reformation by intrusive rock in the period. Typical deposits include silver, lead and zinc polymetallic deposits such as Qingchengzi in Dandong and Bayendaba in Kirchtenstein.（2） Late Triassic-Early Jurassic porphyry type, fine network vein type and skarn type polymetallic ore-forming series. Influenced by the intrusion of magmatic rocks in the early and mid-Yanshan, the lithosphere transitioned from full compression to extension. The transformation causes the deep molten material to rise and form a large-scale medium-acid magma intrusion. The medium-acid magma intrusion has contact metasomatic mineralization with Paleozoic, forming skarn type polymetallic deposits such as Huanggangliang and Cuihongshan. On the other hand, with the increase of magmatic hydrothermal fluid, decompression and atmospheric precipitation, the content of volatiles such as CO2 in the hydrothermal fluid increases, often causing the boiling of fluids, It forms fine vein-like molybdenum mineralization with the medium-deep granitic rocks formed earlier, and forms fine vein-disseminated porphyry molybdenum mineralization in the shallow porphyry.（3） Middle-Late Triassic, magmatic Cu-Ni sulfide deposits ore-forming series. It mainly exists in the type I and type A granites. The ore is formed by three methods: deep magma melting, intermediate magma separation and crystallization, and late hydrothermal enrichment.（4） Early Jurassic-early Cretaceous porphyry, hydrothermal vein, epithermal and skarn deposit
论文目录
文章来源
类型: 国际会议
作者: LI Gang,ZHAO Peng,REN Jian,ZHANG Jing
来源: 第九届世界华人地质科学研讨会 2019-06-01
年度: 2019
分类: 基础科学,工程科技Ⅰ辑
专业: 地质学,地质学,矿业工程
单位: Liaoning Tenth Geological Brigade Co., Ltd
分类号: P611;P588.12
DOI: 10.26914/c.cnkihy.2019.028528
页码: 440-441
总页数: 2
文件大小: 61k
下载量: 3