Pleistocene basaltic volcanism in the southeastern Ailao Shan - Red River Shear zone: Implications for the injection of metasomatized asthenospheric mantle under the region

Nguyen Hoang, Ryuichi Shinjo, Le Duc Luong, Tran Thi Huong, Tran Viet Anh, Phan Dong Pha, Pham Thanh Dang, Cu Sy Thang, Nguyen Thi Thu, Le Thi Phuong Dung
Author affiliations

Authors

  • Nguyen Hoang Institute of Geological Sciences, VAST, Hanoi, Vietnam
  • Ryuichi Shinjo 1-Research Institute for Humanity and Nature (RIHN), Motoyama 457-4, Kamigamo, Kita-ku, Kyoto 603-8047, Japan; 2-Department of Physics and Earth Sciences, University of the Ryukyus, Senbaru-1, Nishihara, Okinawa 903-0213, Japan
  • Le Duc Luong Institute of Geological Sciences, VAST, Hanoi, Vietnam
  • Tran Thi Huong Institute of Geological Sciences, VAST, Hanoi, Vietnam
  • Tran Viet Anh Institute of Geological Sciences, VAST, Hanoi, Vietnam
  • Phan Dong Pha Institute of Marine Geology and Geophysics, VAST, Hanoi, Vietnam
  • Pham Thanh Dang Institute of Geological Sciences, VAST, Hanoi, Vietnam
  • Cu Sy Thang Institute of Geological Sciences, VAST, Hanoi, Vietnam
  • Nguyen Thi Thu Institute of Geological Sciences, VAST, Hanoi, Vietnam
  • Le Thi Phuong Dung Institute of Geological Sciences, VAST, Hanoi, Vietnam

DOI:

https://doi.org/10.15625/2615-9783/21539

Keywords:

Lung Po, India-Eurasian collision, post-collision magmatism, metasomatized asthenosphere, recycled sediment

Abstract

The Lung Po basalt, dating to 0.93, 0.81, and 0.47 Ma, occupies approximately 1 km² and is situated 12 km west of the Ailao Shan Red River Shear Zone (ASRRSZ) and about 65 km south of the 12-0 Ma Maguan intraplate volcanic area in southwest Yunnan (SW China), within the ASRRSZ. This olivine-bearing phyric alkaline basalt is characterized by high TiO₂ (around 2.3 wt.%), MgO (8-10 wt.%), and K₂O (approximately 2.8-3 wt.%) with Na₂O/K₂O ratios ranging from 1 to 1.2. These features partially overlap with the Maguan mantle xenolith-bearing alkaline basalt but are distinct from the Pleistocene alkaline basalt of Vietnam's Western Highlands. The Lung Po basalts exhibit a typical oceanic island basalt (OIB) trace element distribution pattern and a 'crossing' rare earth element (REE) pattern, indicating magma generation possibly by melting of garnet peridotite. They have high ⁸⁷Sr/⁸⁶Sr isotopic ratios (around 0.706) and low ¹⁴³Nd/¹⁴⁴Nd ratios (approximately 0.5126), along with moderate ²⁰⁶Pb/²⁰⁴Pb and ¹⁷⁶Hf/¹⁷⁷Hf isotopic ratios (respectively <18.3-18.4 and 0.28295-0.2830). These isotopic characteristics, coupled with OIB trace element features, challenge the involvement of crustal material. The Lung Po Pleistocene basalt and the 12-0 Ma Maguan alkaline basalt differ significantly from the 42-24 Ma post-collision high-K magmas in the ASRRSZ, which are associated with crustal tectonic processes. Instead, the Lung Po (and Maguan) basalt likely originated from a newly emplaced, metasomatically altered fertile asthenosphere following localized lithosphere extension and delamination after the India-Eurasian collision events.

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16-09-2024

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Nguyen, H., Shinjo, R., Le Duc, L., Tran Thi, H., Tran Viet, A., Phan Dong, P., Pham Thanh, D., Cu Sy, T., Nguyen Thi, T., & Le Thi Phuong, D. (2024). Pleistocene basaltic volcanism in the southeastern Ailao Shan - Red River Shear zone: Implications for the injection of metasomatized asthenospheric mantle under the region. Vietnam Journal of Earth Sciences, 16–43. https://doi.org/10.15625/2615-9783/21539

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