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The leucogranites in the Baoshan Block of the Tethyan belt in Western Yunnan, are composed mainly of two-mica granite with subordinate muscovite granite. Here we present zircon U–Pb ages from four intrusions that show ages of 448–476Ma suggesting that these rocks were emplaced during the Ordovician. The leucogranites are high-K calc-alkaline and strongly peraluminous, with K 2 O/Na 2 ...
Ultrapotassic lavas having distinct geochemical compositions (K 2 O/Na 2 O >2, K 2 O >3%, and MgO >3%) are common and widespread on the Tibet Plateau, where they are closely linked to N–S-trending normal faults. The Tibetan ultrapotassic rocks range in age from ~8 to 24 Ma, slightly older than the spatially associated potassic rocks (10–22 Ma). These lavas consist...
The relationship between the breakup of eastern Gondwanaland and the Kerguelen plume activity is a subject of debate. The Cona mafic rocks are widely exposed in the Cona area of the eastern Himalaya of south Tibet, and are studied in order to evaluate this relationship. Cona mafic rocks consist predominantly of massive basaltic flows and diabase sills or dikes, and are divided into three groups. Group...
The Tibetan crust is twice as thick as average continental crust. Crustal compression and shortening as a result of Indian–Asian collision is often considered to be the primary cause for the crustal thickening. In this paper, we show that magmatic contribution is also important. We come to this conclusion by documenting the Paleogene Linzizong volcanic succession (LVS), its coeval granitoid batholiths...
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