TY - JOUR
T1 - Neoproterozoic sedimentary rocks track the location of the Lhasa Block during the Rodinia breakup
AU - Zhou, Xiang
AU - Zheng, Jianping
AU - Li, Yibing
AU - Griffin, William L.
AU - Xiong, Qing
AU - Moghadam, Hadi Shafaii
AU - O'Reilly, Suzanne Y.
PY - 2019/1
Y1 - 2019/1
N2 - Cimmerian terranes in Tibet are thought to be as old as Archean or as young as Neoproterozoic or even early Paleozoic in age. However, their Precambrian history and their role in the assembly and dispersal of early supercontinents (e.g., Rodinia) are still poorly known. Here, U-Pb dating, trace-element geochemistry and Lu-Hf isotopes of detrital zircons (351 grains) from the Nyainqentanglha-Group clastic rocks, the earliest strata overlying the Lhasa Block (South Tibet), are used to constrain the provenance of the sediments and test paleogeographic and tectonic models for the Lhasa Block during the breakup of the Rodinia supercontinent. The youngest detrital zircon cluster (803 ± 5 Ma) in the clastic rocks and granitic dykes (797 ± 10 Ma) intruding them constrain the deposition age close to 800 Ma. Four main groups of detrital zircons in these sediments record several sources, including Mesoproterozoic and Neoproterozoic juvenile terranes, a Grenvillian orogenic belt and an Archean continental-crust component. Detrital-zircon age distributions and Lu-Hf isotopic data reveal the variation of the sedimentary provenance and suggest its affinity to the Himalaya and/or the East Africa Orogen. These results show that the Lhasa Block was probably located within a giant convergent plate margin system surrounding the Rodinia supercontinent during its breakup in the Tonian time.
AB - Cimmerian terranes in Tibet are thought to be as old as Archean or as young as Neoproterozoic or even early Paleozoic in age. However, their Precambrian history and their role in the assembly and dispersal of early supercontinents (e.g., Rodinia) are still poorly known. Here, U-Pb dating, trace-element geochemistry and Lu-Hf isotopes of detrital zircons (351 grains) from the Nyainqentanglha-Group clastic rocks, the earliest strata overlying the Lhasa Block (South Tibet), are used to constrain the provenance of the sediments and test paleogeographic and tectonic models for the Lhasa Block during the breakup of the Rodinia supercontinent. The youngest detrital zircon cluster (803 ± 5 Ma) in the clastic rocks and granitic dykes (797 ± 10 Ma) intruding them constrain the deposition age close to 800 Ma. Four main groups of detrital zircons in these sediments record several sources, including Mesoproterozoic and Neoproterozoic juvenile terranes, a Grenvillian orogenic belt and an Archean continental-crust component. Detrital-zircon age distributions and Lu-Hf isotopic data reveal the variation of the sedimentary provenance and suggest its affinity to the Himalaya and/or the East Africa Orogen. These results show that the Lhasa Block was probably located within a giant convergent plate margin system surrounding the Rodinia supercontinent during its breakup in the Tonian time.
KW - Detrital zircons
KW - U-Pb-Hf isotopes
KW - Nyainqentanglha Group
KW - Lhasa Block
KW - Neoproterozoic
UR - http://www.scopus.com/inward/record.url?scp=85055738910&partnerID=8YFLogxK
U2 - 10.1016/j.precamres.2018.10.005
DO - 10.1016/j.precamres.2018.10.005
M3 - Article
AN - SCOPUS:85055738910
VL - 320
SP - 63
EP - 77
JO - Precambrian Research
JF - Precambrian Research
SN - 0301-9268
ER -