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Early Jurassic adakitic rocks in the southern Lhasa sub-terrane, southern Tibet: petrogenesis and geodynamic implications

Published online by Cambridge University Press:  02 August 2017

XINFANG SHUI ,
ZHENYU HE ,
REINER KLEMD ,
ZEMING ZHANG ,
TIANYU LU  and
LILI YAN
XINFANG SHUI
Affiliation:
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
ZHENYU HE*
Affiliation:
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China GeoZentrum Nordbayern, Universität Erlangen, Schlossgarten 5a, 91054 Erlangen, Germany
REINER KLEMD
Affiliation:
GeoZentrum Nordbayern, Universität Erlangen, Schlossgarten 5a, 91054 Erlangen, Germany
ZEMING ZHANG
Affiliation:
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
TIANYU LU
Affiliation:
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
LILI YAN
Affiliation:
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China GeoZentrum Nordbayern, Universität Erlangen, Schlossgarten 5a, 91054 Erlangen, Germany School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
*
†Author for correspondence: ahhzy@163.com.
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Abstract

Cretaceous–Miocene adakitic rocks in the southern Lhasa sub-terrane have been intensively investigated, while possible Early Jurassic adakitic rocks in this area have been largely neglected. Petrological and geochemical studies revealed adakitic affinities of an Early Jurassic quartz diorite intrusion with mafic enclaves and three tonalite bodies from the Jiacha area in the southern Lhasa sub-terrane. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U–Pb dating suggests crystallization ages of 199–179 Ma for these rocks. Both quartz diorites and tonalites have typical adakitic geochemical characteristics such as high Al2O3 (15.14–18.22 wt.%) and Sr (363–530 ppm) contents, low Y (4.46–15.9 ppm) and Yb (0.51–1.74 ppm) contents and high Sr/Y ratios of 27–106. The adakitic quartz diorites are further characterized by high MgO (2.63–3.46 wt.%), Mg# (48–54) and εHf(t) (6.6–13.4) values, which were probably produced by partial melting of a subducted oceanic slab with a mantle contribution. The adakitic tonalites have very low abundances of compatible elements and relatively low εHf(t) values (3.5–10.3), and are interpreted to have formed by partial melting of Neoproterozoic mafic lower crust. Upwelling asthenosphere, triggered by rollback of the subducting Bangong–Nujiang (Meso-Tethys) oceanic plate, provided the necessary heat for slab and lower crust melting, resulting in the geochemical diversity of the coexisting felsic intrusive rocks. Contrary to other models, this study further demonstrates that the Bangong–Nujiang oceanic plate was subducted southward beneath the Lhasa terrane during the Early Jurassic.

Keywords

Adakitic rocksslab meltingEarly JurassicBangong–Nujiang (Meso-Tethys) Oceansouthern Lhasa sub-terrane
Type
Original Articles
Information
Geological Magazine , Volume 155 , Issue 1 , January 2018 , pp. 132 - 148
Copyright
Copyright © Cambridge University Press 2017 

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