Paleogene granite magmatism in the north of the Truong Son belt and implication for crustal evolution

Huan Trinh Dinh; Tri Luu Cong; Anh Nguyen Tuan; Anh Tran Viet; Giang Phan Hoang; Takahashi; Saadsy

doi:10.15625/2615-9783/16444

Author affiliations

Authors

Trinh Dinh Huan General Department of Geology and Mineral of Vietnam, Hanoi, Vietnam
Luu Cong Tri General Department of Geology and Mineral of Vietnam, Hanoi, Vietnam
Nguyen Tuan Anh Vietnam Institute of Geological Sciences, VAST, Hanoi, Vietnam
Tran Viet Anh Vietnam Institute of Geological Sciences, VAST, Hanoi, Vietnam
Phan Hoang Giang General Department of Geology and Mineral of Vietnam, Hanoi, Vietnam
Nagi Takahashi University of the Ryukyus, Okinawa, Japan
Boua Lay Saadsy Department of Geology and Mineral of Laos, Vientiane, Laos

DOI:

https://doi.org/10.15625/2615-9783/16444

Keywords:

Truong Son belt, Cenozoic granites, Zircon U-Pb dating, Sr-Nd-Pb isotope

Abstract

Abundant granitoids aged 24.59 Ma to 28.62 Ma were exposed along Phu Hoat high metamorphic zone, northern of the Truong Son belt, termed Na Khoun complex in Northern Laos (NL) and Ban Chieng complex in Western Vietnam (WV). Ten granitic samples were collected from these complexes show geochemical characteristics of high SiO₂ and K₂O contents, medium peraluminous that belong to S-type granites. Initial ⁸⁷Sr/⁸⁶Sr isotopic ratios and εNd(t) are broad values of 0.708507 to 0.74539 and -5.22 to -12.66, respectively, together with high ²⁰⁶Pb/²⁰⁴Pb (18.864-19.392), ²⁰⁷Pb/²⁰⁴Pb (15.736-15.841) and ²⁰⁸Pb/²⁰⁴Pb (39.224-40.080) which indicated crustal origin, we suggest that the NL-WV intrusion was associated with transpression form by the India-Asia collision events during Cenozoic.

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