Southern Tibetan Oligocene–Miocene adakites: A record of Indian slab tearing

Southern Tibetan Oligocene–Miocene adakites: A record of Indian slab tearing

Oligocene–Miocene granitoids exposed within the 1500-km-long Gangdese arc of southern Tibet exhibit adakitic compositions. Five plutonic samples from the southeastern Lhasa terrane near Namche Barwa area were analyzed to determine their geochemical characteristics and to better understand the geodyn...

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Veröffentlicht in:Lithos 2014-12, Vol.210-211, p.209-223
Hauptverfasser: Zhang, Li-Yun, Ducea, Mihai N., Ding, Lin, Pullen, Alex, Kapp, Paul, Hoffman, Derek
Format: Artikel
Sprache:eng
Schlagworte:
Adakitic granitoids
Eastern Himalayan syntaxis
Postcollisional
SE Tibet
Slab tearing
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Zusammenfassung:Oligocene–Miocene granitoids exposed within the 1500-km-long Gangdese arc of southern Tibet exhibit adakitic compositions. Five plutonic samples from the southeastern Lhasa terrane near Namche Barwa area were analyzed to determine their geochemical characteristics and to better understand the geodynamic evolution of the eastern Himalayan syntaxis orogen. The samples, yielded U–Pb zircon ages in the range of 30–26Ma, are intermediate to silicic in composition and have elevated K2O (1.5–8.9), Th/La ratios (0.14–1.10), low MgO (
ISSN:0024-4937
1872-6143
DOI:10.1016/j.lithos.2014.09.029