Cenozoic high Sr/Y volcanic rocks in the Qiangtang terrane, northern Tibet: geochemical and isotopic evidence for the origin of delaminated lower continental melts

Geochemical and Sr–Nd–Pb isotopic data are presented for volcanic rocks from Zougouyouchaco (30.5 Ma) and Dogai Coring (39.7 Ma) of the southern and middle Qiangtang block in northern Tibet. The volcanic rocks are high-K calc-alkaline trachyandesites and dacites, with SiO2 contents ranging from 58.5...

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Veröffentlicht in:	Geological magazine 2008-07, Vol.145 (4), p.463-474
Hauptverfasser:	LIU, SHEN, HU, RUI-ZHONG, FENG, CAI-XIA, ZOU, HAI-BO, LI, CAI, CHI, XIAO-GUO, PENG, JIAN-TANG, ZHONG, HONG, QI, LIANG, QI, YOU-QIANG, WANG, TAO
Format:	Artikel
Sprache:	eng
Schlagworte:	absolute age adakites adakitic rocks alkaline earth metals Ar/Ar Asia basement Cenozoic chemical composition China Continental crust crust dates delamination Dogai Coring China Far East Geochemistry ICP mass spectra igneous and metamorphic rocks igneous rocks isotope ratios isotopes lead lower crust magmatism mass spectra Melting melts metals mineral composition Nd-144/Nd-143 neodymium Paleogene partial melting Pb-206/Pb-204 petrography Petrology Qiangtang Terrane radioactive isotopes rare earths spectra Sr-87/Sr-86 stable isotopes strontium terranes Tertiary textures Tibet Tibetan Plateau trace elements Volcanic rocks X-ray fluorescence spectra yttrium Zougouyouchaco China
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