Early Mesozoic granitoids in southern Vietnam and Cambodia: A continuation of the Eastern Province granitoid belt of Thailand

Nong, Anh Thi Quynh; Hauzenberger, Christoph; Gallhofer, Daniela; Booth, John; Skrzypek, Etienne; Dinh, Sang Quang

doi:10.1016/j.jseaes.2021.105025

Cited by 3 publications

(4 citation statements)

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“…Figure 12b summarizes the emplacement ages of Mesozoic volcanic rocks obtained in this study, Late Paleozoic-Early Mesozoic rocks (Fanka et al 2018;Nualkhao et al 2018;Cheng et al 2019;Hunyek et al 2020;Nong et al 2022) and Late Mesozoic rocks are compiled from the literature (Nguyen et al 2004;Zhou et al 2006;Shellnutt et al 2013;Xu et al 2016;Yan et al 2017;Cheng et al 2019;Nong et al 2021). Volcanism and plutonism along western Indochina occurred episodically from the Carboniferous to the Triassic in the Loei Fold Belt and Sukhothai arc Meffre 2007, Zaw et al 2014;Fanka et al 2018;Hunyek et al 2020).…”

Section: Timing Of Eruption and Significance Of Xenocrystic Zirconmentioning

confidence: 87%

“…The Loei Fold Belt and Sukhothai terranes along the western margin of Indochina are widely accepted to be magmatic arcs formed during the subduction of the Paleo-Tethys beneath Indochina (Zaw and Meffre 2007;Kamvong et al 2014;Zaw et al 2014;Nualkhao et al 2018;Nong et al 2022). The Loei Fold Belt mainly comprises Late Permian-Triassic andesitic-rhyolitic volcanic rocks and subordinate Devonian-Carboniferous and Silurian magmatic rocks which bear signatures of a subduction environment (Zaw and Meffre 2007;Hunyek et al 2020).…”

Section: Regional Outline and Geology Of The Study Areamentioning

confidence: 99%

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Geochemical and zircon U-Pb geochronological constraints on late mesozoic Paleo-Pacific subduction-related volcanism in southern Vietnam

et al. 2022

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Late Mesozoic volcanic rocks comprising mainly basalt and basaltic-andesite to dacite occur in south-central Vietnam (Dalat zone) and to a lesser extent in southwestern Vietnam (Bay Nui area). Mineral and whole-rock chemistry indicate a calc-alkaline affinity for samples in the Dalat zone and a high-K calc-alkaline to shoshonitic affinity for rocks in the Bay Nui area. Mineral characteristics and variation diagrams of selected elements suggest that fractional crystallization dominated during magma differentiation. The Bay Nui volcanic rocks generally are more enriched in potassium and LILEs (large-ion lithophile elements) than volcanic rocks from the Dalat zone, which may indicate a more evolved nature or crustal assimilation. The similar chemical characteristics and eruption/emplacement age range of volcanic and plutonic rocks (ca. 90–110 Ma) of equal silica concentration indicate that the magma feeding the volcanic eruptions had the same source as that of the plutonic rocks. The observed mineral and whole-rock compositions with enrichment in LILEs, depletion in HFSEs (high field strength elements), and noticeably negative Nb, Ta, and Ti anomalies are characteristic for arc signatures. Zircon U-Pb geochronological data for the volcanic rocks indicate an age range of 95–105 Ma for the eruption. These geochemical and geochronological data link this Late Mesozoic volcanism with continental arc magmatism driven by the subduction of the Paleo-Pacific beneath eastern Indochina. Zircon xenocrysts with a likely magmatic origin cluster around 350 Ma and 250 Ma, indicating two earlier magmatic events most likely related to the subduction of the Paleo-Tethys beneath western Indochina and the subsequent Indosinian orogeny.

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Section: Timing Of Eruption and Significance Of Xenocrystic Zirconmentioning

confidence: 87%

Section: Regional Outline and Geology Of The Study Areamentioning

confidence: 99%

Geochemical and zircon U-Pb geochronological constraints on late mesozoic Paleo-Pacific subduction-related volcanism in southern Vietnam

et al. 2022

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“…U–Pb dating was previously conducted on only three granitic bodies, namely Phnom Tamao, Pha Aok, and Phnom Den, located in southwestern Cambodia (Chanthaburi–Kampong Chhnang zone or Sukhothai zone) by Nong et al [ 7 , 8 ], and produced ages of 187.8 ± 3.2, 78.8 ± 1.1, and 93.5 ± 1.5 Ma, respectively. The ages obtained in this study are in close agreement, with ages of 197.41 ± 0.55 Ma for Phnom Tamao, 80.89 ± 0.95 Ma for Pha Aok, and 97.72 ± 0.79 Ma for Phnom Den.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the measurement accuracy was further improved by Kasahara et al [ 4 ] using a U–Pb dating method for zircons from granitic rocks in northeastern Cambodia. However, except for a few cases, U–Pb dating for zircons separated from granitic rocks in southwestern Cambodia has not been conducted [ 7 , 8 ]. Therefore, U–Pb dating was performed for zircons of granitic rocks collected in southwestern Cambodia in this study.…”

Section: Introductionmentioning

confidence: 99%