Geochemistry and zircon U Pb geochronology of Late Mesozoic igneous rocks from SW Vietnam – SE Cambodia: Implications for episodic magmatism in the context of the Paleo-Pacific subduction

Nong, Anh Thi Quynh; Hauzenberger, Christoph; Gallhofer, Daniela; Dinh, Sang Quang

doi:10.1016/j.lithos.2021.106101

Cited by 17 publications

(29 citation statements)

References 65 publications

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“…12). The Cretaceous samples mostly exhibit similar REE patterns which resemble analyses of samples from the same region published by Nong et al (2021), and both data sets tend to have lower HREE than age equivalent samples from the Dalat Zone. Sample (Tonleap) is clearly distinct with elevated HREE (ca.…”

Section: Geochemistrysupporting

confidence: 61%

“…All four age groups show generally similar subduction-related/ average continental crustal trace element signatures in MORB-normalized multi- (Nong et al, 2021). The Permian samples have generally smaller negative Ba anomalies and slightly lower LILE contents (e.g., Rb and Th) when compared to the Cretaceous samples, although as noted above, given the generally altered nature of the Permian samples and the propensity for mobility of LILE in fluids, it is unclear if this is a primary feature.…”

Section: Geochemistrymentioning

confidence: 83%

“…50x chondrites) and a pronounced negative Eu anomaly compared to other Cretaceous samples, although we note that similar REE patterns are observed in some Dalat Zone samples. Elevated HREE contents also characterize young post-orogenic S Cambodian samples (e.g., Phnom Da 58 Ma; Cheng et al, 2019) and the A-type granites from SW Vietnam and SW Cambodia of Nong et al (2021). Samples 538386 and 538804 (Phnom Aya and Hon Tre S, respectivelyboth c. 107 Ma) are distinct from the other Cretaceous samples and have similar concave MREE-depleted patterns and relatively small Eu anomalies (Fig.…”

Section: Geochemistrymentioning

confidence: 87%

“…Based on these observations, all samples from this study with CIA > 55 are highlighted with a circle in all geochemical plots, and their classification in the totalalkaliessilica diagram and SiO 2 -K 2 O diagram is therefore not trustworthy. We note that several samples from the study of Nong et al (2021) also have CIA > 55 and may be altered, although their LOI is relatively low (Fig. 4).…”

Section: Geochemistrymentioning

confidence: 87%

“…Cheng et al (2019) present a suite of whole-rock Rb-Sr ages for rocks from NE and S Cambodia, which spatially overlap in part with the rocks investigated here. Recently, Nong et al (2021) have provided additional U-Pb zircon ages and geochemical data for granitoids from a portion of the same region as investigated here.…”

Section: Regional Geologymentioning

confidence: 99%

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Permian to Cretaceous granites and felsic volcanics from SW Vietnam and S Cambodia: Implications for tectonic development of Indochina

Waight¹,

Fyhn

Thomsen

et al. 2021

Journal of Asian Earth Sciences

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Section: Geochemistrysupporting

confidence: 61%

Section: Geochemistrymentioning

confidence: 83%

Section: Geochemistrymentioning

confidence: 87%

Section: Geochemistrymentioning

confidence: 87%

Section: Regional Geologymentioning

confidence: 99%

See 3 more Smart Citations

Permian to Cretaceous granites and felsic volcanics from SW Vietnam and S Cambodia: Implications for tectonic development of Indochina

Waight¹,

Fyhn

Thomsen

et al. 2021

Journal of Asian Earth Sciences

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Provenance of Oligocene–Miocene sedimentary rocks in the Cuu Long and Nam Con Son basins, Vietnam and early history of the Mekong River

Breitfeld

Hennig-Breitfeld

BouDagher‐Fadel

et al. 2022

Int J Earth Sci (Geol Rundsch)

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The offshore Cuu Long (CLB) and Nam Con Son (NCSB) basins of SE Vietnam are two important Cenozoic hydrocarbon-bearing basins in the southern South China Sea (SCS), which can contribute to understanding the evolution of major SE Asian river systems, in particular the Mekong River. The Oligocene to Early Miocene basin fill of the Cuu Long Basin is dominated by sediment sourced locally from the Da Lat Zone basement on land. Sandstones have abundant Cretaceous detrital zircons and heavy mineral assemblages dominated by apatite and epidote. The Bach Ho Unconformity at c. 16 to 20.5 Ma marks a major provenance change and the overlying Middle to Late Miocene Con Son and Dong Nai formations were sourced by a large river system, which drained Indochina or even the Himalaya, resembling the present-day Mekong River. These formations have heterogeneous detrital zircon populations dominated by Triassic ages and zircon–rutile–tourmaline-dominated heavy mineral assemblages. The Oligocene Cau and Early Miocene Dua formations of the Nam Con Son Basin have a similar provenance to the CLB Con Son and Dong Nai formations, indicating a comparable drainage history of a large proto-Chao Phraya. At the Dua Unconformity at c. 15.4 to 17 Ma the Indochina provenance signature changes to a predominant Sibumasu signature.The early Mekong River evolution is suggested to have involved two river systems. A proto-Mekong 1 initially filled the CLB, while at the same time a proto-Chao Phraya River with a capture area into the Himalaya filled the Malay Basin and/or the NCSB. At the end of the Early Miocene drainage was completely reorganised, and the proto-Mekong 1 captured the headwaters of the proto-Chao Phraya and became the proto-Mekong 2, while the NCSB was filled by sediment from the Malay–Thai Peninsula. This major change marks a very important drainage reorganisation in the southern SCS region.

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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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Geochemistry and zircon U Pb geochronology of Late Mesozoic igneous rocks from SW Vietnam – SE Cambodia: Implications for episodic magmatism in the context of the Paleo-Pacific subduction

Cited by 17 publications

References 65 publications

Permian to Cretaceous granites and felsic volcanics from SW Vietnam and S Cambodia: Implications for tectonic development of Indochina

Permian to Cretaceous granites and felsic volcanics from SW Vietnam and S Cambodia: Implications for tectonic development of Indochina

Provenance of Oligocene–Miocene sedimentary rocks in the Cuu Long and Nam Con Son basins, Vietnam and early history of the Mekong River

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

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