TY - JOUR
T1 - “Where, when and why” for the arc-trench gap from Mesozoic Paleo-Pacific subduction zone
T2 - Sabah Triassic-Cretaceous igneous records in East Borneo
AU - Wang, Yuejun
AU - Qian, Xin
AU - Bin Asis, Junaidi
AU - Cawood, Peter A.
AU - Wu, Sainan
AU - Zhang, Yuzhi
AU - Feng, Qinglai
AU - Lu, Xianghong
N1 - Funding Information:
Professor Andrea Festa and two reviewers are thanked for their critical comments and constructive suggestions. We acknowledge the National Natural Science Foundation of China ( 41830211 and U1701641 ), Guangdong Basic and Applied Basic Research Foundation (2018B030312007 and 2019B1515120019), Second Tibetan Plateau Scientific Expedi- tion and Research Program (2019QZKK0703) and the Australian Research Council (FL160100168) for financial support. Drs. AM Zhang, CS Gan, WT Wang, PZ Zhang, R Huang, Y Wang, X Qiu, Z Liu, HY He, X Yang, QY Gou, XQ Yu, C Xu and TX Yang are gratefully acknowledged for their field and experimental help.
Publisher Copyright:
© 2023 International Association for Gondwana Research
PY - 2023/5
Y1 - 2023/5
N2 - Establishing the location (where), timing (when) and reasons for the development (why) for the Mesozoic subduction along the western Paleo-Pacific that extended from Coastal South China to SE Vietnam has proven problematic due to the difficulty in the identification of the fore-arc igneous rocks. This paper firstly presents a set of zircon U-Pb and whole-rock 40Ar/39Ar geochronological, zircon in-situ Lu-Hf isotopes, and whole-rock elemental and Sr-Nd-Pb isotopic data for the Mesozoic igneous rocks from the Sabah ophiolites and Segama non-ophiolitic basement in NE Borneo. Our work documents major phases of the formation of these rock units at ∼185–140 Ma, ∼135–112 Ma and ∼130–85 Ma for the Telupid, Kudat and Darvel Bay ophiolites in Sabah, respectively. The mafic rocks within the ophiolites are classified into the MORB-, high-Nb, Nb-enriched and arc-like rocks, with the similar Sr-Nd (εNd(t) = +6.4–+10.2) and Atlantic-Pacific Ocean MORB-like Pb isotopic compositions. Their generation is related to input of slab-derived melt in the MORB mantle wedge source in an arc-trench gap setting. The Segama non-ophiolitic igneous rocks were dated at 251–178 Ma, with zircon in-situ εHf(t) = +9.5–+17.5, and are classified as high-Si and low-Si adakite, and high-mg andesite. They are the fractional products of the wedge-derived magma with the source being modified by slab-derived fluids. The magmatic flare-ups at ∼251–203, ∼185–153 Ma, ∼135–112 Ma and ∼95–85 Ma in Sabah are comparable with those in Coastal South China and West Borneo, indicating the Jurassic-Cretaceous accretionary orogenesis in Sabah. Sabah was tectonically located at the East Cathaysia margin of South China in the Mesozoic. It was a long-lived (>150 Ma) Andean-type active continental margin with multi-staged pulsed subduction and rollback in East Asia. Such a subduction system initiated no later than the earliest Triassic (∼251 Ma) and continued till the Late Cretaceous (∼85 Ma).
AB - Establishing the location (where), timing (when) and reasons for the development (why) for the Mesozoic subduction along the western Paleo-Pacific that extended from Coastal South China to SE Vietnam has proven problematic due to the difficulty in the identification of the fore-arc igneous rocks. This paper firstly presents a set of zircon U-Pb and whole-rock 40Ar/39Ar geochronological, zircon in-situ Lu-Hf isotopes, and whole-rock elemental and Sr-Nd-Pb isotopic data for the Mesozoic igneous rocks from the Sabah ophiolites and Segama non-ophiolitic basement in NE Borneo. Our work documents major phases of the formation of these rock units at ∼185–140 Ma, ∼135–112 Ma and ∼130–85 Ma for the Telupid, Kudat and Darvel Bay ophiolites in Sabah, respectively. The mafic rocks within the ophiolites are classified into the MORB-, high-Nb, Nb-enriched and arc-like rocks, with the similar Sr-Nd (εNd(t) = +6.4–+10.2) and Atlantic-Pacific Ocean MORB-like Pb isotopic compositions. Their generation is related to input of slab-derived melt in the MORB mantle wedge source in an arc-trench gap setting. The Segama non-ophiolitic igneous rocks were dated at 251–178 Ma, with zircon in-situ εHf(t) = +9.5–+17.5, and are classified as high-Si and low-Si adakite, and high-mg andesite. They are the fractional products of the wedge-derived magma with the source being modified by slab-derived fluids. The magmatic flare-ups at ∼251–203, ∼185–153 Ma, ∼135–112 Ma and ∼95–85 Ma in Sabah are comparable with those in Coastal South China and West Borneo, indicating the Jurassic-Cretaceous accretionary orogenesis in Sabah. Sabah was tectonically located at the East Cathaysia margin of South China in the Mesozoic. It was a long-lived (>150 Ma) Andean-type active continental margin with multi-staged pulsed subduction and rollback in East Asia. Such a subduction system initiated no later than the earliest Triassic (∼251 Ma) and continued till the Late Cretaceous (∼85 Ma).
KW - Arc-trench gap
KW - East Asian active continental margin
KW - Long-lived Paleo-Pacific subduction
KW - Sabah ophiolites
KW - Segama non-ophiolitic basement
UR - http://www.scopus.com/inward/record.url?scp=85147363920&partnerID=8YFLogxK
U2 - 10.1016/j.gr.2023.01.008
DO - 10.1016/j.gr.2023.01.008
M3 - Article
AN - SCOPUS:85147363920
SN - 1342-937X
VL - 117
SP - 117
EP - 138
JO - Gondwana Research
JF - Gondwana Research
ER -