TY - JOUR
T1 - Southern extension of the Paleotethyan zone in SE Asia
T2 - Evidence from the Permo-Triassic granitoids in Malaysia and West Indonesia
AU - Wang, Yuejun
AU - Qian, Xin
AU - Zhang, Yuzhi
AU - Gan, Chengshi
AU - Zhang, Aimei
AU - Zhang, Feifei
AU - Feng, Qinglai
AU - Cawood, Peter A.
AU - Zhang, Peizhen
N1 - Funding Information:
We thank the National Natural Science Foundation of China ( 41830211 and U1701641 ) and Natural Science Foundation of Guangdong Province ( 2018B030312007 , 2019B1515120019 and 2019QZKK0703 ) for financial support. Peter A. Cawood acknowledges Australian Research Council grant FL160100168 for support. Prof. J. Glodny and an anonymous reviewer are thanked for their critical and constructive comments, as well as the editor-in-chief for thorough editorial advice. Drs. Y Wang, X-Q Yu, C Xu, Q-Y Gou, X Yang, Z Liu, H-Y He, T-X Yang, S-N Wu, X-H Lu and R Huang are gratefully acknowledged for their field and experimental help.
Publisher Copyright:
© 2021 Elsevier B.V.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/10
Y1 - 2021/10
N2 - The consumption of the East Paleotethyan Ocean was the final step in creating the united SE Asia continent. However, uncertainties remain as to the significance of Paleotethyan-associated granitoids and when ocean closure finally occurred in west Indonesia and Malaysia. This paper presents new U-Pb geochronological, petrologic, elemental and Sr-Nd-Pb-Hf isotopic results for granitoids from west Kalimantan, West Java, Bangka-Belitung and Peninsular Malaysia. These granitoids are geochemically subdivided into the Eastern and Main Range granites. The Eastern granites include the granitoids from west Kalimantan, West Java and East Peninsular Malaysia and are dated at ~256–207 Ma, ~208–207 Ma and ~289–217 Ma, respectively. They have εNd(t) = +0.2 ~ −9.1, with two-peaks of +0.1 and −5.6, (206Pb/204Pb)i = 18.64–19.49, (207Pb/204Pb)i = 15.61–15.78 and (208Pb/204Pb)i = 38.56–39.47, and originated from a mixed source involving juvenile crust and Indochina basement. The Main Range granites occur in Bangka-Belitung (West Indonesia) and West Peninsular Malaysia, and have crystallization ages of ~226–198 Ma. They share the similar Sr-Nd-Pb-Hf isotopic compositions with those in the South China and Inthanon Triassic granites, with 87Sr/86Sr(t) = 0.70725–0.72652, εNd(t) = −5.6 ~ −10.8, ∆8/4 = 28.1–109 and ∆7/4 = 13.7–23.6, and were derived from a meta-greywacke source. Our data reveals the development of the Paleotethyan-associated Permo-Triassic granitoids in West Java, Belitung and west Kalimantan. The Bentong-Raub suture forms the East Paleotethyan suture boundary in Peninsular Malaysia, and extends southwards into the easternmost Bangka-Belitung Islands (and even West Java). To the north, it links to the Inthanon-Changning-Menglian suture in NW Thailand and SW China. It is concluded that the temporal pattern of the East Paleotethyan Ocean in west Indonesia and Malaysia correlates with that in NW Thailand and SW China. Its evolution switched from subduction to assembly of the Indochina-East Malaysia and Sibumasu at ~230 Ma. The Eastern granites might reflect active margin processes in response to the eastward subduction of the Paleotethyan Ocean, and the Main Range granites represent the post-collisional igneous rocks.
AB - The consumption of the East Paleotethyan Ocean was the final step in creating the united SE Asia continent. However, uncertainties remain as to the significance of Paleotethyan-associated granitoids and when ocean closure finally occurred in west Indonesia and Malaysia. This paper presents new U-Pb geochronological, petrologic, elemental and Sr-Nd-Pb-Hf isotopic results for granitoids from west Kalimantan, West Java, Bangka-Belitung and Peninsular Malaysia. These granitoids are geochemically subdivided into the Eastern and Main Range granites. The Eastern granites include the granitoids from west Kalimantan, West Java and East Peninsular Malaysia and are dated at ~256–207 Ma, ~208–207 Ma and ~289–217 Ma, respectively. They have εNd(t) = +0.2 ~ −9.1, with two-peaks of +0.1 and −5.6, (206Pb/204Pb)i = 18.64–19.49, (207Pb/204Pb)i = 15.61–15.78 and (208Pb/204Pb)i = 38.56–39.47, and originated from a mixed source involving juvenile crust and Indochina basement. The Main Range granites occur in Bangka-Belitung (West Indonesia) and West Peninsular Malaysia, and have crystallization ages of ~226–198 Ma. They share the similar Sr-Nd-Pb-Hf isotopic compositions with those in the South China and Inthanon Triassic granites, with 87Sr/86Sr(t) = 0.70725–0.72652, εNd(t) = −5.6 ~ −10.8, ∆8/4 = 28.1–109 and ∆7/4 = 13.7–23.6, and were derived from a meta-greywacke source. Our data reveals the development of the Paleotethyan-associated Permo-Triassic granitoids in West Java, Belitung and west Kalimantan. The Bentong-Raub suture forms the East Paleotethyan suture boundary in Peninsular Malaysia, and extends southwards into the easternmost Bangka-Belitung Islands (and even West Java). To the north, it links to the Inthanon-Changning-Menglian suture in NW Thailand and SW China. It is concluded that the temporal pattern of the East Paleotethyan Ocean in west Indonesia and Malaysia correlates with that in NW Thailand and SW China. Its evolution switched from subduction to assembly of the Indochina-East Malaysia and Sibumasu at ~230 Ma. The Eastern granites might reflect active margin processes in response to the eastward subduction of the Paleotethyan Ocean, and the Main Range granites represent the post-collisional igneous rocks.
KW - Assemblage of the Indochina-East Malaysia and Sibumasu
KW - East Paleotethyan process
KW - Elements and Sr-Nd-Pb-Hf isotopes
KW - Permo-Triassic granites
KW - West Indonesia and Malaysia
KW - Zircon U-Pb dating
UR - http://www.scopus.com/inward/record.url?scp=85109431482&partnerID=8YFLogxK
U2 - 10.1016/j.lithos.2021.106336
DO - 10.1016/j.lithos.2021.106336
M3 - Article
AN - SCOPUS:85109431482
SN - 0024-4937
VL - 398-399
JO - Lithos
JF - Lithos
M1 - 106336
ER -