Metamorphic Hydrothermal (Orogenic-Type) Systems

Nuo Li, Xiao Hua Deng, Jun Ming Yao, Zhi Yong Ni, Franco Pirajno, Yan Jing Chen

Research output: Chapter in Book/Conference paperChapterpeer-review

Abstract

So far, the metamorphic hydrothermal or orogenic-type Mo deposits have been reported only in Qinling Orogen. Except for the 430-Ma Yindonggou Mo project in North Qinling Accretion Belt and the ~1850-Ma Longmendian Mo deposit in the Xiong’er Terrain, other orogenic-type Mo deposits occur in the northern margin of the Huaxiong Block and yield Triassic ages. The Waifangshan cluster includes ten swarms of structurally controlled Mo-quartz veins, as exemplified by the Zhifang deposit formed at depths of 10–12.5 km. The Dahu Au–Mo deposit includes a group of fault-controlled quartz veins. Triassic Mo mineralization occurred at a depth of ~11 km, associated with the northward subduction of the paleo-Tethys oceanic plate, and then overprinted by the Yanshanian gold mineralization (at depth of ~7.8 km) related to the collision between Yangtze and North China continents. The 1850-Ma Longmendian Mo deposit was formed during the assembly of the Columbia supercontinent. Orebodies are present as quartzofeldspathic veins or leucosome in migmatitic gneisses. Immiscible fluid inclusion assemblages suggest Mo mineralization at a depth of ~11 km. Hence, the orogenic-type Mo mineralization occurred at depths of >10 km, corresponding to the mesozonal-to-hypozonal class of the crustal continuum model.

Original languageEnglish
Title of host publicationGeology and Geochemistry of Molybdenum Deposits in the Qinling Orogen, P R China
EditorsYanJing Chen, Franco Pirajno, Nuo Li, XiaoHua Deng, YongFei Yang
Place of PublicationGermany
PublisherSpringer Science and Business Media B.V.
Chapter6
Pages625-764
Number of pages140
Volume22
ISBN (Electronic)978-981-16-4871-7
DOIs
Publication statusPublished - 1 Jan 2022

Publication series

NameModern Approaches in Solid Earth Sciences
Volume22
ISSN (Print)1876-1682
ISSN (Electronic)1876-1690

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