Structural setting of the Narusongduo Pb-Zn ore deposit in the Gangdese belt, central Tibet

The Narusongduo Pb-Zn deposit is located at the northern boundary of Luobadui-Milashan fault zone (LMF) in central Tibet and spatially associated with Linzizong volcanic succession (LVS). Our study indicates that regional structural setting was formed by two-stage tectonic events. first stage, spanning from late Mesozoic to early Paleocene, characterized significant N-S crustal shortening Cordilleran-type orogeny along Gangdese arc. region's Paleozoic-Mesozoic metasedimentary rocks were penetratively strained. Locally deformation largely partitioned LMF. During second stage (ca. 66–55 Ma), area affected extensive multi-stage volcanism, including caldera formation, as well a coaxial propagative distinctive lower rate. We recognized two types mineralization, both during stage. type mineralization (orebody III) governed fractures within extensively deformed Paleozoic carbonate LMF's footwall. overlying LVS, however, includes discrete but numerous mineralized sections. terminal splays ore shoots typify products hydraulic fracturing. propose compressive drained fluid reservoirs depth higher levels via “Fault valve” effect. Episodic influxes mineral deposition time-integrated mineralization. I) hosted LVS number breccia pipes dykes controlled weaknesses generated intersection radial ring fractures. Mineralization occurs veinlets matrix clasts inside breccias, which are brittle cracking, injection precipitation. It interpreted magmatism Ma) triggered repeated hydrothermal activities incremental ore-bearing bodies.