Early cretaceous granitoids and their implications for the collapse of the Dabie orogen, eastern China: SHRIMP zircon U–Pb dating and geochemistry

High Oxygen Fugacity and Slab Melting Linked to Cu Mineralization: Evidence from Dexing Porphyry Copper Deposits, Southeastern China

“…8B), Dexing adakites have typical negative Nb, Ta, and Ti anomalies and are enriched in large-ion lithophile elements. These characteristics are similar to (Wang et al 2007a;Xu et al 2007;Huang et al 2008). Data for the Dexing adakitic porphyries are listed in table S1.…”

Process and mechanism of mountain-root removal of the Dabie Orogen—Constraints from geochronology and geochemistry of post-collisional igneous rocks

“…Previous studies have found that the early granites in the Dabie orogen have high Sr/Y and La/Yb features whereas the later ones do not have, suggesting the early granites as adakitic rocks [3][4][5][6]. High Sr/Y and La/Yb features, however, can also be found in normal granites with other petrogenesis [7][8][9][10][11][12][13][14][15][16], and thus do not convincingly indicate that the early granites are partial melts of thickened LCC.…”

“…Mountain-root removal and foundering of thickened mafic LCC not only caused mantle upwelling and mafic magmatism, but also induced partial melting of lowermiddle crust of the orogen, producing the large volume of granitc magmas after 130 Ma [4,5,17,23]. Although ore resources are scarce in the central Dabie zone where nowadays middle-lower crust is exposed due to uplifting and erosion by magma doming [24][25][26], the Cretaceous giant Mo deposit discovered in the North Dabie zone and the North Huaiyang zone indicates that the mountain root removal process may help mineralization [26].…”

Petrogenesis of the early Cretaceous volcanic rocks in the North Huaiyang tectono-magmatic unit of the Dabie Orogen, eastern China: Implications for crust–mantle interaction

“…The upwelling asthenosphere can provide sufficient heat to melt the lithospheric mantle, resulting in voluminous mafic magmas. With respect to the tectonic mechanism for the Early Cretaceous magmatism, lithospheric extension has been suggested Xu et al, 2007;Yang et al, 2008aYang et al, , 2008bZheng, 2008;Dai et al, 2012). The large-scale partial melting of the continental crust marks beginning of the extension, while the mafic-ultramafic igneous rocks and alkaline rocks demonstrate the intensive lithospheric thinning and extensional setting in the region.…”