Song M.-C.,Bureau of Mineral Resources |
Song M.-C.,REPUBLIC RESOURCES |
Li S.-Z.,Ocean University of China |
Santosh M.,China University of Geosciences |
And 9 more authors.
Ore Geology Reviews | Year: 2015
The Jiaojia type gold deposits in the Jiaodong Peninsula of the North China Craton represent an emerging major gold reserve, and constitute one of the two important types of gold deposits in China, the other being the Linglong type. The gold mineralization in these deposits can be subdivided into seven categories namely, altered-rock type in the fracture zone, gold-bearing quartz vein type, braided quartz vein type along fracture zones, quartz-sulfide vein type, interlayer type along the detachment belt, altered-conglomerate type and breccia type along the basin margin faults. The peak gold mineralization occurred during Early Cretaceous with the metallogeny controlled by extensive crust-mantle interaction. The deposits are hosted in the Early Precambrian basement and Mesozoic intrusions which experienced phyllic, sulfidic, silicic, and potassic alterations. The structures of the ore bodies include pinchout, repetition splay branches, composite, lateral tilting, echelon and imbrications. The upwelling of hot magma, fluid activity and extensional detachment resulted in the formation of extensive gold deposits in the Jiaodong Peninsula. The extensional detachment derived from magma upwelling provided favorable ore-hosting structure for the gold deposition. The ladder-type ore-hosting structures show variation from sharp to gentle dips with marked enrichment of the gold ores at the gentle angle of the fault segments and at the transition from steep to gentle dip angles, displaying a step-fault-controlled ore deposition. The formation of the gold deposits in the Jiaodong Peninsula coincided with the large-scale Early Cretaceous thinning of the lithosphere in the North China Craton, mainly controlled by extensional tectonics. © 2014 Elsevier B.V.
Song M.,Bureau of Mineral Resources |
Song M.,Laboratory of Gold Mine Proc and Res Utilization of Mini of Land and Res of the Peoples Republic of China |
Li S.,Ocean University of China |
Yi P.,Bureau of Mineral Resources |
And 11 more authors.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2014
The Jiaojia-style gold deposit in Jiaodong Peninsula, the most important type of gold deposit in China, belongs to the structure-controlled hydrothermal gold deposit. It can be subdivided into the altered-rock type in the fracture zone, gold-bearing quartz vein type, stockwork quartz vein type along the fracture zone, quartz-sulphide vein type, interlayer type along the detachment belt, altered-conglomerate type and breccia type along the basin margin faults. These types of gold mineralization took place mainly in the Early Cretaceous period. The ore-forming materials were derived from an intensive crust-mantle interaction. The Early Precambrian and Mesozoic ore-hosting rocks were experienced generally phyllic, pyritization, silicification and potassic alteration. Gold bodies are characterized by pinch out, branches, composite, repetition, lateral extension, lateral tilting, echelon and imbrication. The uplifting of hot magma, fluid activities and extensional detachment resulted in the massive formation of gold deposits in Jiaodong Peninsula. The coeval-melted segregation magma and activated fluids derived from the Early Cretaceous crust-mantle interaction are important carriers of migration and enrichment of gold materials. The extensional detachment resulted from magma uplifting provided favorable ore-hosting spaces for the gold mineralization. Therefore, a thermal uplifting-extension-controlled metallogenic theory is proposed. The Jiaojia-style gold deposit was caused by the large-scale thinning of the lithosphere in the Early Cretaceous period in the Eastern China, being controlled by extensional tectonics. The ore-controlling faults have the ladder-style variation from steep to gentle dip angles. The gold deposits are emplaced and enriched at the gentle angle fault segments and the break part from steep to gentle dip angles, displaying a ladder-like distribution pattern.