2019
DOI: 10.1002/gj.3559
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Miocene potassic and adakitic intrusions in eastern central Lhasa terrane, Tibet: Implications for origin and tectonic of postcollisional magmatism

Abstract: Miocene postcollisional potassic and adakitic rocks are widely distributed in the southern Lhasa terrane and western central Lhasa terrane. However, coeval potassic and adakitic rocks in eastern central Lhasa terrane were rarely recognized, and their origins and formation mechanism remain controversial. In this paper, we provide new geochronological and geochemical data for the Miocene postcollisional potassic and adakitic intrusions exposed in the Qingdu area, eastern central Lhasa terrane, southern Tibet. Th… Show more

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Cited by 7 publications
(5 citation statements)
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References 78 publications
(359 reference statements)
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“…Thus, partial melting of thickened or delaminated lower continental crust at depths greater than 50 km is often invoked in the genesis of continental adakitic melts (Chung et al, 2003;Ma, Zheng, Xu, Griffin, & Zhang, 2015;Xie, Zeng, Liu, & Gao, 2010). For example, igneous rocks with adakitic geochemical signature have been widely used for tracing crustal thickening processes of the Himalayan-Tibetan orogen (Chen et al, 2013;Chung et al, 2009;Guan et al, 2012;Ji et al, 2012;Lu et al, 2019;Ma et al, 2014;Xie et al, 2010;Xu, Wang, Wang, Guo, & Pei, 2006;Zhang, Li, Cao, Zhang, & Yong, 2019;. However, studies have mainly focused on the Lhasa or Qiangtang terrane, northern part of the Himalayan-Tibetan orogen (Chen et al, 2013;Chung et al, 2009;Guan et al, 2012;Ji et al, 2012;Lu et al, 2019;Ma et al, 2014;, FIGURE 1 Tectonic map of the Himalaya-Tibetan Plateau region: (a) geotectonic sketch of southeastern Asia Yin & Harrison, 2000); (b) simplified geological map of Himalaya, showing the distribution of leucogranites (modified after Cao et al, 2018;Guillot et al, 2008;.…”
Section: Introductionmentioning
confidence: 99%
“…Thus, partial melting of thickened or delaminated lower continental crust at depths greater than 50 km is often invoked in the genesis of continental adakitic melts (Chung et al, 2003;Ma, Zheng, Xu, Griffin, & Zhang, 2015;Xie, Zeng, Liu, & Gao, 2010). For example, igneous rocks with adakitic geochemical signature have been widely used for tracing crustal thickening processes of the Himalayan-Tibetan orogen (Chen et al, 2013;Chung et al, 2009;Guan et al, 2012;Ji et al, 2012;Lu et al, 2019;Ma et al, 2014;Xie et al, 2010;Xu, Wang, Wang, Guo, & Pei, 2006;Zhang, Li, Cao, Zhang, & Yong, 2019;. However, studies have mainly focused on the Lhasa or Qiangtang terrane, northern part of the Himalayan-Tibetan orogen (Chen et al, 2013;Chung et al, 2009;Guan et al, 2012;Ji et al, 2012;Lu et al, 2019;Ma et al, 2014;, FIGURE 1 Tectonic map of the Himalaya-Tibetan Plateau region: (a) geotectonic sketch of southeastern Asia Yin & Harrison, 2000); (b) simplified geological map of Himalaya, showing the distribution of leucogranites (modified after Cao et al, 2018;Guillot et al, 2008;.…”
Section: Introductionmentioning
confidence: 99%
“…Similar Nb-enriched basalts were later reported from Kamchatka [52,58], the Philippines [59] and Baja California [55], always in close spatial and temporal association with adakite magmas. High-niobium basalts (HNBs) are best defined (Table 3, Figure 3) as subalkaline to alkaline (Na2O + K2O > 3.5 wt.%; [38,40,41,43,45,48,51,52,55,56,64,103,105], underplating and lower crustal melting (n = 160) [66,68,69,[71][72][73][106][107][108][109][110][111][112] and high-pressure fractionation of mafic magmas (n = 156) [74][75][76][77]102,[113][114][115]. Figure 2.…”
Section: High-nb Basaltsmentioning
confidence: 99%
“…Adakites are widespread in crustal terranes of all ages within the western, northern, southern, central and easterns parts of the Tibetan plateau, where they were formed through a range of petrogenetic processes including slab melting, the partial melting of underplated and rifted continental crust and high-pressure (amphibole ± garnet) fractionation of hydrous, mantle-derived magmas [65,68,69,71,72,110,112,114,125]. At several locations in Tibet, adakites are closely associated with magnesian andesites and high-Nb basalts suggesting intense adakite-peridotite interactions in the sub-Tibetan mantle [65,266,268].…”
Section: Tibetmentioning
confidence: 99%
“…1b). The magmatic rocks can be divided into adakitic intrusive rocks, potassic–ultrapotassic volcanic rocks, and peraluminous granites (Chung et al , 2003; Hou et al , 2004; Williams et al , 2004; Liao et al , 2007; Mo et al , 2007; Huang et al , 2016; Zhang et al , 2019). In particular, potassic–ultrapotassic volcanic rocks, which are mainly derived from the breakoff of the Indian continental lithosphere (Hou et al , 2004; Ding et al , 2006; Huang et al , 2015), are characterized by high K 2 O/Na 2 O ratios and occur as dykes, lava flows and pyroclastic deposits (Miller et al , 1999).…”
Section: Geological Settingmentioning
confidence: 99%