First Identification of Late Permian Nb‐Enriched Basalts in Ailaoshan Region (SW Yunnan, China): Contribution From Emeishan Plume to Subduction of Eastern Paleotethys

Xu, Jian; Xia, Xiaoping; Lai, Chun‐Kit; Zhou, Meiling; Ma, Pengfei

doi:10.1029/2018gl081687

Cited by 40 publications

(7 citation statements)

References 118 publications

(244 reference statements)

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“…Previous studies have mainly focused on the geochronological evidence from igneous and metamorphic rocks in the region (Lepvrier et al, ; H. Liu et al, ; J. Liu et al, ; Nakano et al, , ; Xu, Xia, Lai, et al, ; Zi et al, ), whereas little attention was paid to the well‐exposed Triassic sedimentary sequences. Detrital zircon grains are extremely resistant mineral, and they are known to survive extended cycles of weathering and crustal recycling (Williams, ).…”

Section: Introductionmentioning

confidence: 99%

When Did the Paleotethys Ailaoshan Ocean Close: New Insights From Detrital Zircon U‐Pb age and Hf Isotopes

Xia

Lai

et al. 2019

Tectonics

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We present new laser ablation (LA)‐multicollector‐inductively coupled plasma mass spectrometry detrital zircon U‐Pb age and Hf isotope data of the Triassic sedimentary rocks from the eastern and western sides of the Ailaoshan suture in SW China, which separate the Indochina and South China blocks. Detrital zircon grains of the Lower‐Middle Triassic sequences from western South China show single age population of 280–237 Ma (peak at 254–251 Ma) with mainly positive εHf(t) values (+0.15 to +9.11, ~60%). The Middle Triassic samples from eastern Indochina also contain single age population of 273–236 Ma (peak at 246–242 Ma), but with mainly negative εHf(t) values (−18.95 to −1.83, ~88%). The unimodal detrital zircon age pattern and Hf isotope features suggest that the Permian‐Triassic magmatic arcs had supplied detritus for the Lower‐Middle Triassic sequences on both sides of the Ailaoshan suture. In contrast, the Upper Triassic sequences on the either side of the suture display similar polymodal age populations at 290–230, 500–400, 850–700, 1000–900, 2000–1800, and 2600–2400 Ma. This indicates a dramatic change in detrital provenance across the Middle‐Late Triassic boundary. We interpret this change to be resulted from the closure of the Paleotethyan Ailaoshan Ocean in the early Late Triassic. The ocean closure and consequent Indochina‐South China continent‐continent collision may have connected the drainage systems of the two blocks, leading to the marked similarities in their post‐Middle Triassic sedimentary provenance.

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Section: Introductionmentioning

confidence: 99%

When Did the Paleotethys Ailaoshan Ocean Close: New Insights From Detrital Zircon U‐Pb age and Hf Isotopes

Xia

Lai

et al. 2019

Tectonics

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“…In addition, the late Permian (ca. 261 Ma) Nb‐rich basalts in the Ailaoshan area and the low δ 18 O A‐type granites in southwestern China also indicate that the southwestern margin of the SCB experienced the subduction of the Ailaoshan Ocean (Xu et al, 2022; Xu, Xia, Lai, Zhou, & Ma, 2019). There is also evidence of the subduction of the Palaeo‐Tethys Ocean on the northern side of the CQF.…”

Section: Discussionmentioning

confidence: 99%

“…He, Wang, Xin, and Zhang (2018) found Permian andesites reflective of a MORB source with the input of a slab-derived component in a continental back-arc basin setting. The discovery of Carboniferous eclogite and metamorphic complex in the Mulantou area in the northeast corner of Hainan Island (Liu, Hu, et al, 2022;Liu, Hu, Chen, et al, 2021) (Mo et al, 2023;Xia et al, 2020;Xu et al, 2022;Xu, Xia, et al, 2020;Xu, Xia, Lai, Long, & Huang, 2019;Xu, Xia, Lai, Zhou, & Ma, 2019). The Jinshajiang-Ailaoshan-Songma…”

Section: Division Of Tectonics and Collision Assembly Mode Of Hainan ...mentioning

confidence: 99%

Closing of the east Palaeo‐Tethys Ocean: Source–sink records from Middle Triassic sediments, Hainan Island, China

Gao,

Xu,

Kong

et al. 2024

Geological Journal

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During the Late Palaeozoic to Early Mesozoic, the eastern segment of the Palaeo–Tethys Ocean closed, resulting in the collision and amalgamation of the South and North Hainan Islands. However, the exact location of the collision and amalgamation remains controversial. The main collision locations are the Baisha, Jiusuo–Lingshui and Changjiang–Qionghai faults. The U–Pb age of detrital zircons was used to determine the main source area of the Middle Triassic basin in the eastern part of Hainan Island and the closed position of the eastern section of the Palaeo‐Tethys Ocean. The U–Pb dating of detrital zircons revealed that the Middle Triassic Lingwen Formation contains four age groups: 235–258, 335–446, 766–986 and >1000 Ma. Notably, rock masses aged 248–252 Ma that were formed in a post‐orogenic tension setting have been identified in the western region of Hainan Island, whereas no igneous rocks from this period have been discovered in the eastern region. The detrital zircon samples from the Lingwen Formation revealed a peak at 249 ± 2 Ma U–Pb age, which is important evidence indicating that the Changjiang–Qionghai Fault is the product of collision between the southern and northern Hainan terranes. Affected by the bipolar subduction of the eastern segment of the Palaeo‐Tethys Ocean, the collision and amalgamation of the South and North Hainan terranes occurred, and experienced a post‐collision (extensional) process at ca. 249 ± 2 Ma.

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“…Subduction of the Eastern Paleo-Tethys has been attributed by some authors to contribute to the end-Permian Emeishan Large Igneous Province (LIP) (Xu et al, 2019). The Emeishan LIP has hosted many magmatic Fe-Ti-V oxide and Ni-Cu-PGE sulfide deposits, yet its spatial continuation to the SE (e.g., in Guangxi and NW Vietnam) is still inadequately constrained (Halpin et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Editorial: Plate subduction and mineralization in East and Central Asia

et al. 2022

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First Identification of Late Permian Nb‐Enriched Basalts in Ailaoshan Region (SW Yunnan, China): Contribution From Emeishan Plume to Subduction of Eastern Paleotethys

Cited by 40 publications

References 118 publications

When Did the Paleotethys Ailaoshan Ocean Close: New Insights From Detrital Zircon U‐Pb age and Hf Isotopes

When Did the Paleotethys Ailaoshan Ocean Close: New Insights From Detrital Zircon U‐Pb age and Hf Isotopes

Closing of the east Palaeo‐Tethys Ocean: Source–sink records from Middle Triassic sediments, Hainan Island, China

Editorial: Plate subduction and mineralization in East and Central Asia

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