caa a22 4500 606150137 CHVBK 20210128100537.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s00531-014-1080-z doi (NATIONALLICENCE)springer-10.1007/s00531-014-1080-z Late Triassic Batang Group arc volcanic rocks in the northeastern margin of Qiangtang terrane, northern Tibet: partial melting of juvenile crust and implications for Paleo-Tethys ocean subduction [Elektronische Daten] [Shao-Qing Zhao, Jun Tan, Jun-Hao Wei, Ning Tian, Dao-Han Zhang, Sheng-Nan Liang, Jia-Jie Chen] The Batang Group (BTG) volcanic rocks in the Zhiduo area, with NW-trending outcrops along the northeastern margin of the Qiangtang terrane (northern Tibet), are mainly composed of volcaniclastic rocks, dacite and rhyolite. Major and trace element, Sr and Nd isotope, zircon U-Pb and Hf isotope data are presented for the BTG dacites. Laser ablation inductively coupled plasma mass spectrometry zircon U-Pb dating constrains the timing of volcanic eruption as Late Triassic (221±1Ma). Major and trace element geochemistry shows that the BTG volcanic rocks are classified as calc-alkaline series. All samples are enriched in large-ion lithophile elements and light rare earth elements with negative-slightly positive Eu anomalies (Eu/Eu*=0.47-1.15), and depleted in high field strength elements and heavy rare earth elements. In addition, these rocks possess less radiogenic Sr [(87Sr/86Sr) i =0.7047-0.7078], much radiogenic Nd (εNd(t)=−4.2 to −1.3) and Hf (εHf(t)=4.0-6.6) isotopes, suggesting that they probably originated from partial melting of a crustal source containing a mantle-derived juvenile component. The inferred magma was assimilated by crustal materials during ascending and experienced significant fractional crystallization. By combining previously published and the new data, we propose that the BTG volcanic rocks were genetically related to southwestward subduction of the Ganzi-Litang ocean (a branch of Paleo-Tethys) in the northeastern margin of the Qiangtang terrane. Given the coeval arc-affinity magmatic rocks in the region, we envisage that the Ganzi-Litang ocean may extend from the Zhongdian arc through the Yidun terrane to the Zhiduo area, probably even further northwest to the Tuotuohe area. Springer-Verlag Berlin Heidelberg, 2014 Geochemistry nationallicence Zircon U-Pb age nationallicence Hf isotope nationallicence Island arc nationallicence Ganzi-Litang ocean nationallicence Zhao Shao-Qing Faculty of Earth Resources, China University of Geosciences, 430074, Wuhan, China aut Tan Jun Faculty of Earth Resources, China University of Geosciences, 430074, Wuhan, China aut Wei Jun-Hao Faculty of Earth Resources, China University of Geosciences, 430074, Wuhan, China aut Tian Ning Faculty of Earth Resources, China University of Geosciences, 430074, Wuhan, China aut Zhang Dao-Han Faculty of Earth Resources, China University of Geosciences, 430074, Wuhan, China aut Liang Sheng-Nan Faculty of Earth Resources, China University of Geosciences, 430074, Wuhan, China aut Chen Jia-Jie Faculty of Earth Resources, China University of Geosciences, 430074, Wuhan, China aut International Journal of Earth Sciences Springer Berlin Heidelberg 104/2(2015-03-01), 369-387 1437-3254 104:2<369 2015 104 531 https://doi.org/10.1007/s00531-014-1080-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00531-014-1080-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhao Shao-Qing Faculty of Earth Resources, China University of Geosciences, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Tan Jun Faculty of Earth Resources, China University of Geosciences, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Wei Jun-Hao Faculty of Earth Resources, China University of Geosciences, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Tian Ning Faculty of Earth Resources, China University of Geosciences, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Zhang Dao-Han Faculty of Earth Resources, China University of Geosciences, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Liang Sheng-Nan Faculty of Earth Resources, China University of Geosciences, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Chen Jia-Jie Faculty of Earth Resources, China University of Geosciences, 430074, Wuhan, China aut NATIONALLICENCE 773 0- International Journal of Earth Sciences Springer Berlin Heidelberg 104/2(2015-03-01), 369-387 1437-3254 104:2<369 2015 104 531