Yanshanian( Jura-Cretaceous) igneous processes and metallogenesis of the Taihangshan-Yanshan-WestLiaoning orogenic belt, North China

Category Mineral processing
Group GSI.IR
Location International Geological Congress,oslo 2008
Author Deng, Jinfu; Su, Shangguo; Liu, Cui; Zhao, Guochun; Zhou, Su; Wu, Zongxu
Holding Date 15 September 2008

It is well known that the North China Craton was formed in the late Archean and was developed as a typical stable plaform setting prior to Jurassic, however, during the Jura-Cretaceous (Yanshanian) time its eastern part, including Taihang shan-Yanshan-West Liaoning area, was reactivated and transformed into an Orogenic Belt. The Taihangshan-Yanshan-West Liaoning orogenic belt is a Yanshanian Au-Mo-Pb-Zn-Ag-Cu-Fe metallogenic belt, and also an important area of Yanshanian coal field in eastern China. This paper is discussed the isotopic ages of both the eighteen ore deposits and ore related intrusive bodies of Yanshanian time, as well as the association of the large coal field. The Yanshanian magmatic-sedimentary-tectonic event sequence of this belt has been created. During both the pre- and initial orogenic episode (J1) and post-orogenic episode (K12), both the neutral tectonics and the warm environment are supported a good geodynamic setting for the formation of large coal fields. During the syn-orogenic episodes, the large-scale magmaticsm is given a good geodynamic setting for metallogeneses. During the early orogenic episode (J2), both the andesitic magmas and the Au & Pb-Zn ore-deposits mainly are formed by the partial melting of the Archean lower crust. During the peak orogenic episode (J3), both the large-scale granitic magmas and the Mo ore-deposits are generated from the intensive melting of the Archean upper crust. During the late orogenic episode (K11), the gabbro-monzodiorite & Fe ore-deposits and the monzonite- quartze monzonite & Cu ore-deposits are formed the asthenospheric mantle and the Jurassic-formed lower crust, respectively, at the beginning of the temperature decreasing of the upper crust.