Collision-induced basalt eruptions at Pleiku and Buôn Mê Thuột, south-central Viet Nam

Hoàng, Nguyễn; Flower, Martin F. J.; Chí, Cung Thượng; Xuan, Pham Tich; Quy, Hoang Van; Sơn, Trần Thanh

doi:10.1016/j.jog.2012.03.012

Cited by 65 publications

(94 citation statements)

References 125 publications

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“…40 Ar/ 39 Ar dating indicates that the Cenozoic volcanism in Hainan Island and Leizhou Peninsula started in the late Miocene (∼13 Ma; Wang et al, ). In south Vietnam, 40 Ar/ 39 Ar dating on 41 samples show that the first stage of igneous activity is from the very beginning of middle Miocene (16 Ma; Lee et al, ), began ∼17 Ma ago and continues until today, mostly along the offshore margin (Hoàng et al, ), but is restricted in another study to an age range from 13.8 to 4.1 Myr (An et al, ). Thus, these basaltic samples are all younger than 17 Myr, suggesting that the influence of the Hainan plume might have started ∼17 Ma ago.…”

Section: Mechanism Of Postspreading Volcanism In the South China Seamentioning

confidence: 99%

Postseafloor Spreading Volcanism in the Central East South China Sea and Its Formation Through an Extremely Thin Oceanic Crust

Zhao

Sibuet

et al. 2018

Geochem Geophys Geosyst

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P wave velocity models were obtained by forward and inverse modeling from 38 ocean bottom seismometers deployed in the central East subbasin of the South China Sea (SCS). Four types of crust have been defined: (a) thin oceanic crust (<5 km), (b) typical oceanic crust (5–6 km), (c) thick oceanic crust hosting postspreading volcanoes (>6 km) with significant intrusive roots, and (d) thick oceanic crust with enhanced spreading features (>6 km) but without significant roots. Within the central East subbasin, the thin oceanic crust, only identified inside an 80 km wide zone, is located within an overall 150 km wide domain characterized by N055° seafloor spreading trends. The postspreading volcanoes were formed during a N‐S tensional episode around 6–10 Ma, several millions of years after seafloor spreading ceased in the SCS. Seafloor spreading (N055° and N145°) and postspreading (N000° and N090°) features are observed in the morphology of some of these volcanoes. The rupture of the brittle thin oceanic crust was focused where the crust was the weakest, i.e., at the intersection of the extinct spreading ridge with former fracture zones. From geological and geophysical arguments, we suggest that the postspreading volcanism might have been influenced by the Hainan plume activity through a buoyancy‐driven partial melting mechanism.

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Section: Mechanism Of Postspreading Volcanism In the South China Seamentioning

confidence: 99%

Postseafloor Spreading Volcanism in the Central East South China Sea and Its Formation Through an Extremely Thin Oceanic Crust

Zhao

Sibuet

et al. 2018

Geochem Geophys Geosyst

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“…Isotopic studies of basalts in the Hainan area suggest a source depth in the MTZ or possibly lower mantle [Zou and Fan, 2010]. However, investigations on petrogenesis of Cenozoic basalts from Vietnam favor a model with mantle upwelling induced by decompression melting in the shallow upper mantle [Hoang and Flower, 1998;Hoang et al, 2013]. In general, most of the geochemical studies are not supportive of a classic plume from the lower mantle as the source of the volcanoes [e.g., Hoang and Flower, 1998;Hoang et al, 2013].…”

Section: Thermal Upwelling Adjacent To Slab Segments In the Mtzmentioning

confidence: 99%

Mantle transition zone discontinuities beneath the Indochina Peninsula: Implications for slab subduction and mantle upwelling

Gao

Liu

et al. 2017

Geophysical Research Letters

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While the northward indentation of the Indian into Eurasian plates has been intensively investigated, its oblique subduction beneath the Indochina Peninsula (ICP) and the role it played on mantle structure and dynamics remain enigmatic. In this first regional‐scale receiver function study of the mantle transition zone (MTZ) discontinuities beneath the ICP and its surrounding areas, we stack ∼12,000 receiver functions recorded at 33 stations using a non–plane wave common‐conversion‐point stacking technique. Systematic spatial variations of MTZ thickness with departures between −21 and +24 km from the globally averaged value are revealed, providing independent evidence for the presence of slab segments in the MTZ beneath the central and a slab window beneath the western ICP. The results also support the existence of broad mantle upwelling adjacent to the eastern edge of the slab segments, which might be responsible for the widespread Cenozoic volcanisms and pervasively observed upper mantle low velocities in the area.

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“…A cluster of craters was produced by volcanism in the central Vietnamese Highlands as recently as 200,000 years ago in the Gia Lai Province, Vietnam [15]. A few of those craters still feature maar lakes, such as Biển Hồ Lake (14 • 03 03.5 N, 108 • 00 00.2 E) near the city of Pleiku (Figure 1).…”

Section: Maar Site Descriptionmentioning

confidence: 99%

Low Cost, Lightweight Gravity Coring and Improved Epoxy Impregnation Applied to Laminated Maar Sediment in Vietnam

et al. 2018

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Abstract:In response to the need for lightweight and affordable sediment coring and high-resolution structural documentation of unconsolidated sediment, we developed economical and fast methods for (i) recovering short sediment cores with undisturbed topmost sediment, without the need for a firmly anchored coring platform, and (ii) rapid epoxy-impregnation of crayon-shaped subcores in preparation for thin-sectioning, with minimal use of solvents and epoxy resin. The 'Autonomous Gravity Corer' (AGC) can be carried to remote locations and deployed from an inflatable or makeshift raft. Its utility was tested on modern unconsolidated lacustrine sediment from a~21 m deep maar lake in Vietnam's Central Highlands near Pleiku. The sedimentary fabric fidelity of the epoxy-impregnation method was demonstrated for finely laminated artificial flume sediment. Our affordable AGC is attractive not only for work in developing countries, but lends itself broadly for coring in remote regions where challenging logistics prevent the use of heavy coring equipment. The improved epoxy-impregnation technique saves effort and costly chemical reagents, while at the same time preserving the texture of the sediment.

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Collision-induced basalt eruptions at Pleiku and Buôn Mê Thuột, south-central Viet Nam

Cited by 65 publications

References 125 publications

Postseafloor Spreading Volcanism in the Central East South China Sea and Its Formation Through an Extremely Thin Oceanic Crust

Postseafloor Spreading Volcanism in the Central East South China Sea and Its Formation Through an Extremely Thin Oceanic Crust

Mantle transition zone discontinuities beneath the Indochina Peninsula: Implications for slab subduction and mantle upwelling

Low Cost, Lightweight Gravity Coring and Improved Epoxy Impregnation Applied to Laminated Maar Sediment in Vietnam

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