Petrogenesis of the Lüliangshan Early Paleozoic Composite Granite Pluton in North Qaidam Tectonic Belt
Zhang Yi
Zhu Xiaohui
Pu Yongxia
Zhang Jun
Ren Yunfei
Wang Haijie
Kong Hongxi
Chen Danling
Abstract：Magmatism plays an important role in rebuilding evolutionary history of orogenic belts. This paper presents a systematic study of petrology,geochemistry and geochronology on the Lüliangshan granite pluton at west segment of the North Qaidam ultrahigh pressure metamorphic belt. The results show that the Lüliangshan pluton is a composite granite pluton formed in three magma periods in response to continental crust subduction,exhumation and mountain collapse. The first period (436-430 Ma) formed mainly small scale porphyry granodiorite,which is partial melting products of thickened mafic lower crust during continental subduction. The second period (400-390 Ma) formed tonalite and minor synogranite and monzonitic granite,which are partial melting products of exhumed eclogite-bearing ultrahigh pressure metamorphic terrane and lower continental crust during post-collisional extension. The third period (365-360 Ma) formed large scale two-mica granite,with strong peraluminous S-type granite geochemical characteristics and is partial melting products of metapelite during orogen unrooting and collapse.
Keywords：geochemistryzircon U-Pb datinggraniteLüliangshanNorth Qaidampetrology
Publication Date：2024-09-15
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：16( 3106-3121 )