Petrogenesis and Geological Implications of the Oligocene Chongmuda-Mingze Adakite-Like Intrusions and Their Mafic Enclaves, Southern Tibet

The role of Indian and Tibetan lithosphere in spatial distribution of Cenozoic magmatism and porphyry Cu–Mo deposits in the Gangdese belt, southern Tibet

“…10 2010), partial melting of thickened lower crust (Chung et al, 2003;Hou et al, 2004), and partial melting of subduction-modified Tibetan lithosphere (Guo et al, 2007;Hou et al, 2009;Li et al, 2011;Wang et al, 2014a, b;Zheng et al, 2012). These intrusions formed ~35 m.y.…”

“…2; Chung et al, 2003Chung et al, , 2005Ding et al, 2003;Gao et al, 2007;Guo et al, 2013;Hou et al, 2004Hou et al, , 2009Leng et al, 2013;Li et al, 2011;Liu et al, 2011;Miller et al, 1999;Turner et al, 1996;Wang et al, 2014a, b, c;Williams et al, 2004;Wu et al, 2014;Yang et al, 2009;Zhao et al, 2009;Zheng et al, 2012; The Oligo-Miocene igneous rocks in the Gangdese belt show a sharp longitudinal distinction in petrography, geochemistry, and association with porphyry-type mineralization, with a boundary at ~89°E. The eastern Gangdese group (longitude ~89°-94° E) is characterized mainly by intermediate-felsic calc-alkaline to high-K calcalkaline plutons (which are locally associated with porphyry Cu-Mo deposits), and minor high-K calc-alkaline to shoshonitic volcanic rocks.…”

Timing of Secondary Hydrothermal Alteration of the Luobusa Chromitites Constrained by Ar/Ar Dating of Chrome Chlorites

“…Coeval granitic intrusions were also found in other locations around the Yaja granodiorite ( Figure 1b) and dated by Ar-Ar and zircon U-Pb methods [46][47][48][49][50]76]. The geochemical compositions of these plutons show adakitic affinities, with high SiO 2 , K 2 O, and Sr, but low Y and Yb contents [43,47,49,50,61]. Combined with other Late Oligocene-Miocene (ca.…”

“…On the basis of the linear distribution of post-collisional adakitic intrusions along the south edge of Gangdese batholith, and especially the fact that the late Oligocene plutonism occurred extensively in the Zedong area [43,[45][46][47][48][49][50]76] west of Luobusa and in the Gyaca area east of Luobusa, it is reasonable to speculate the existence of coeval plutonism in the local Luobusa area. The newly found gold enrichment in the Luobusa listwanites [28] also supports such a speculation, which may extend the Kelu-Liebu-Chongmuda ore-forming sub-belt father to the east.…”

“…(b) Geological map of the study area (Zedong-Luobusa), modified from Aitchison et al [44]. The ~30 Ma intrusives are marked on the map based on references [43,[45][46][47][48][49][50]. RZT = Renbu-Zedong thrust.…”