Abstract
The Ga’erqiong Cu-Au deposit, which sits on the north side of the Coqên-Xainzamagmatite belt, is a large-scale skarn-type deposit, whose ore body has formed in the skarn zone in the contact part of quartz diorite and marble of Duoai formation or the cracks of quartz diorite. Its mineralization is closely related to quartz diorite. And granite porphyry-related molybdenum ore still exists in its deep part. Currently, there are disputes about the metallogenic dynamics background of this deposit. From previous studies, this paper carried out zircon LA-LCPMS U-Pb dating and petrogeochemistry study for quartz diorite of Ga’erqiong Cu-Au deposit. The testing result indicates: quartz diorite and granite porphyry were formed respectively in 88±2Ma and 83±1Ma, belonging to the magmatic activity of the early stage of Upper Cretaceous; quartz diorite and granite porphyry have geochemical characteristics similar to those of island arc rock of subduction zone and geochemical indexes similar to “adakite.” Combining with the regional tectonic evolution, we think that quartz diorite and granite porphyry were all formed in the extension environment after the collision of Lhasa block and Qiangtang block. Quartz diorite is the result of the migmatization of basic melt and acid melt evoked by asthenosphere material raise caused by lower crustal delamination; the formation of granite porphyry may be crust-mantle material’s partial melting results due to delaminated lower crustal. Therefore, Ga’erqiongskarn-type Cu-Au deposit belongs to the metallogenic response to the collisional orogeny in the closing process of Meso-Tethys.
Highlights
Bangong Lake-Nujiang River Metallogenic belt includes ophiolite melange belt in suture zone and the magmatite zone related to the tectonic evolution of Meso Tethys in the south and north side (Geng, Pan, Wang, Peng, & Zhang, 2011)
By detailed field investigations and previous studies, this paper conducted an analysis of chronology and geochemistry to granide which is closely related to mineralizing relation, deeply explored the cause of formation of this ore-related intermediateacid rock and analyzed metallogenic dynamics background of Ga’erqiong Cu-Au Deposit
Our results provide a foundation for studies of the mineralization process and metallogenic prediction of Ga’erqiong Cu-Au Deposit
Summary
Bangong Lake-Nujiang River Metallogenic belt includes ophiolite melange belt in suture zone and the magmatite zone related to the tectonic evolution of Meso Tethys in the south and north side (Geng, Pan, Wang, Peng, & Zhang, 2011). Deepening the understanding of the geologic feature and genetic mechanism of current deposits with relatively high working level plays an important enlightening role in determining the range of reconnaissance and summarizing the regularity of ore formation of the metallogenic belt of Bangong Lake-Nujiang River. Chinese deposit scientists have conducted relatively detailed studies in aspects of the geologic feature, geochemistry of mineral deposits, metallogenetic chronology and diagenetic and metallogenic geodynamics of Ga’erqiong Cu-Au Deposit (Tang et al, 2013; Yao et al, 2013; Lei et al, 2012). By detailed field investigations and previous studies, this paper conducted an analysis of chronology and geochemistry to granide which is closely related to mineralizing relation, deeply explored the cause of formation of this ore-related intermediateacid rock and analyzed metallogenic dynamics background of Ga’erqiong Cu-Au Deposit. Fault zone as the boundary, Lhasa block can be divided into north Gangdise and middle Gangdise, while the border of middle Gangdise and the further south Gangdise arc-ridge fault-uplift zone is Ga’er-Longgeer-Zhari Namco-Cuomai fault zone (Zhu et al, 2009; Zhu et al, 2001)
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