Petrogenesis and tectonic implications of the Dupangling complex rock mass in south China
In this paper,the LA-ICP-MS zircon U-Pb chronology and whole-rock major-trace element geochemistry are studied for the Dupangling complex rock mass in South China,and the petrogenesis and tectonic implications are discussed.The results indicate that the Dupangling complex rock mass was emplaced during two distinct periods:Caledonian(418 Ma)and Indosinian(212 Ma).The Caledonian granites are mainly of granodiorite and monzogranite,which belong to S-type granite,derived through dehydration melting of Precambrian metamorphic sedimentary basement in Cathaysia block plus additional input from mantle-derived magma.Their emplacement implies that the lithospheric delamination occurred at 418 Ma on the west side of the metamorphic core of the early Paleozoic orogen in South China.The rock types of the In-dosinian granites include monzogranite,syenogranite and alkali-feldspar granite,which belong to A-type granites,formed by shallow dehydration melting of the Caledonian granitoids.Their emplacement implies thatthe tectonic regimetransition changed from the Tethyan to the Pacific tectonic domain did not take place until at least 212 Ma.
CaledonianIndosiniangranitecomplex intrusiveSouth China
万方数据
维普
