Volume 47 Issue 7
Jul.  2022
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Fan Caiwei, Hu Lin, Hu Qianwei, 2022. Late Mesozoic Magmatic Arc: Constraints from Well KP1-1-1 Detrital Zircon U-Pb Data, South China Sea. Earth Science, 47(7): 2328-2336. doi: 10.3799/dqkx.2022.033
Citation: Fan Caiwei, Hu Lin, Hu Qianwei, 2022. Late Mesozoic Magmatic Arc: Constraints from Well KP1-1-1 Detrital Zircon U-Pb Data, South China Sea. Earth Science, 47(7): 2328-2336. doi: 10.3799/dqkx.2022.033

Late Mesozoic Magmatic Arc: Constraints from Well KP1-1-1 Detrital Zircon U-Pb Data, South China Sea

doi: 10.3799/dqkx.2022.033
  • Received Date: 2021-11-08
  • Publish Date: 2022-07-25
  • The Late Mesozoic is an important tectonic episode for Paleo-Pacific slab subduction and magmatic arc evolution in the South China Sea. The low-metamorphosed sandstone drilled by KP1-1-1 belongs to a proximal deposition which helps to reveal tectonic characteristics of the magmatic arc provenance. Based on LA-ICPMS detrital zircon analysis, age components of 129-155 Ma, 155-172 Ma, and 172-196 Ma are identified from KP1-1-1 sandstone in the western Pearl River Mouth Basin, in accordance with regional tectono-magmatic events. These magmatic zircons which derive from arc-related magmatic source are characterized by low-temperature (551-786℃), enrichment of fluid-mobile elements (U, Th) and depletion of high field-strength elements (Nb, Hf and Ti). They are characterized by high element ratios of U/Yb (0.34-3.92), Sc/Yb (0.48-2.28), Hf/Th (14.4-186.6), and Th/Nb (24.3-462.7), indicating the related magmatism in a continental arc environment. The age component of 172-196 Ma from the sandstone registers the Early Jurassic Dongsha-Talun-Yandang magmatic arc further stretching southwest in East to South China Seas, as a result of oblique initial subduction of the Paleo-Pacific slab. The major component of 155-172 Ma reveals an intensified slab subduction and arc-related magmatism in South China Sea, comparable to voluminous granitic magmatism (165-150 Ma) in South China. The minor component of 129-155 Ma found, however, implies a reduced arc-related magmatism due to slow subduction or slab rollback, sharply in contrast to intensified rhyolite volcanism (120-160 Ma) developed in Zhejiang to Fujian coastal areas. The minimum U-Pb age 128.8 Ma of detrital zircon defines the stratigraphic age of KP1-1-1 sandstone as Cretaceous, not the latest Late Proterozoic to Early Paleozoic as traditionally treated.

     

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