Metallogenic and magmatic systems of intracontinental porphyry copper deposits: <?A3B2 pi6?>A case study of the Wushan copper deposit in the Middle-Lower Yangtze River <?A3B2 pi6?>Valley Metallogenic Belt

<p indent="0mm"> Porphyry copper deposits are the most significant source of copper resources in the world. They were generally formed in thickened (crustal thickness <sc>​&gt;35 km)</sc> island arc or active continental margin environments (island arc-type), and associated with the long-term magmatic activity and mature transcrustal magmatic plumbing systems. However, most porphyry copper deposits in China were formed in non-island arc settings (collisional orogenic and intracontinental orogenic settings, as well as the margins or interiors of re-activated cratons). The operational dynamics and mechanisms of their transcrustal magmatic systems are still poorly understood. In this paper, we have systematically carried out petrographic, petrogeochemical, and mineralogical studies on igneous rocks associated with the Wushan copper deposit, one of the typical Mesozoic intracontinental-type porphyry copper deposits in the Middle-Lower Yangtze River Valley Metallogenic Belt, and then established a model of the transcrustal magmatic system for the Wushan copper deposit. Furthermore, we conducted a comparative study on the magmatic systems and their evolutionary characteristics between intracontinental-type and island arc-type porphyry copper deposits. Finally, we revealed the differences in the spatio-temporal distribution relationships between magmatic rocks and orebodies in intracontinental porphyry copper deposit and those in island arc-type porphyru copper deposit.