Nguyen Hoang

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Verified

Nguyen verified their affiliation via an institutional email.

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• PhD
• Supervisor at Vietnam Academy of Science and Technology

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 Ti...

This paper investigated the petrological, elemental, and isotope geochemical characteristics of the Nam Meng dioritoid to clarify the magma source and process. The Nam Meng massif comprises large amounts of dioritoids (gabbro-diorite and quartz diorite) and lesser amounts of granitoids (granodiorite and granite). The Nam Meng gabbro-diorite is a po...

Vietnam contains complex faults coupled with a diffuse igneous province that has been active since the mid‐Miocene. However, existing fault maps demonstrate little consensus over the location of Neogene basalt flows and relative ages of mapped faults, which complicates interpretations of tectonic model for the evolution of Indochina. This paper ide...

Mantle rocks usually contain rare earth elements (REE) in very low concentrations. Here we document an occurrence of monazite associated with REE-rich apatites in a carbonate-bearing wehrlite xenolith from central Vietnam. The xenolith displays an equigranular matrix of rounded olivine grains while texturally primary orthopyroxene, clinopyroxene an...

We present data for lithospheric mantle xenoliths sampled from two alkali basalts in south‐central Vietnam, Pleiku and Xuan Loc, including fertile spinel peridotites. To better determine the origins of the Indochinese subcontinental lithospheric mantle (SCLM), including impacts of posited tectonic extrusion, we present major and trace elements, and...

Extrusion tectonics has been invoked to explain recent magmatism across Indochina (e.g., Hoang & Flower, 1998). Lithospheric mantle xenoliths sampled from two alkali basalts in south-central Vietnam, Pleiku and Xuan Loc, comprise fertile spinel peridotites. To better determine the origins of the Indochinese subcontinental lithospheric mantle (SCLM)...

Cenozoic magmatism in Northern Vietnam is suggested to have a genetic connection with the Indian–Eurasian collision and is associated with the formation and evolution of the Red River shear zone and adjacent structures. Cenozoic biotite and porphyritic granites are mainly recognized in the northwestern part of the Phan Si Pan uplift, with a smaller...

We analyzed 39 gas samples, including carbon dioxide, hydrocarbon gases C1–C4, hydrogen, and helium, in surface sediment from 19 gravity cores collected from the SW sub-basin of the East Vietnam Sea (EVS) using the headspace and vacuum degassing methods. Based on the result, we discussed the distribution and origin of gases in the southwest sub-bas...

Structural research in the Cho Dien ore cluster and its environs has revealed that sublatitudinal stresses were a cause of the formation of fold and fault structures. At the Nam Lung deposit, the stratified orebearing strata show evidence of upward interlayer migration of ore components, which is associated with wide development of interstratal thr...

During the joint Russian-Vietnamese studies in the East Vietnam Sea (known as Bien Dong or the South China Sea), manifestations of new hydrocarbon-accumulating zones were discovered; a series of evidence of the presence of mineral indicators for solid minerals in shelf deposits were obtained; a unique zone, where accumulations of ferromanganese cru...

180 км се-вернее Ханоя и имеет ключевое значение в решении вопроса о природе аномальной металлоносности территории зоны Ло Гам. Здесь локализованы поли-металлические месторождения, интегрально объеди-няющие не менее трети запасов руд свинца и цинка Вьет нама. Давно установлено, что в узле присутству-ют как пластообразные, согласно и субсогласно зал...

The spreading of the East Vietnam Sea (EVS, also known as Bien Dong, or the South China Sea), leading to the occurrence of syn-spreading (33-16 Ma) and post-spreading (< 16 to present) volcanism. Syn-spreading magma making up thick layers of tholeiitic basalt with a geochemical composition close to the refractory and depleted mid-ocean ridge basalt...

The monograph presents the results of joint scientifi c Russian-Vietnamese integrated expedition onboard RV “Akademik M.A. Lavrentiev” (cruise 88), carried out 5.10–08.12.2019. The primary results of the geological structure and geophysical fi elds of the Vietnam continental shelf and slope and deep basins, the study of oceanographic, gasgeochemica...

The Kontum Massif, located in central Vietnam, played an essential role in the evolution of Indochina and its adjacent areas. The Van Canh granites, exposed throughout the Southern Kontum Massif, display SiO2 contents ranging from 65.82 to 75.35 wt%, and total alkaline (Na2O+K2O) from 5.47 to 9.82 wt%, with A/CNK values between 0.97 and 1.08. The m...

This study presents the chemical, mineralogical and physicochemical features of 8 saline mud samples from 8 gravity cores located in the southwestern sub-basin of the East Vietnam Sea. The grain-size analysis of mud samples reveals the amount of clay and silt particles in the ranges of 65.1-89.2% and 9.5-34.2%, respectively and a very low fraction...

Data of methane, helium and hydrogen concentrations in the mineral waters, as well as in the subsurface atmosphere, of the Cat Ba, Co To and Bach Long Vi islands, shows that the regions belong to degassing zones of hydrogen and helium, and points at gas condensate potential of the Bac Bo sedimentary basin. A joint transit of these gases via the fau...

Nineteen sites with 198 oriented-core samples have been collected from the Upper Permian-Lower Triassic volcanic rocks of Vien Nam Formation at Quynh Nhai locality, Son La Province, northwestern Vietnam. The characteristic remanent magnetization components carried by magnetite and hematite were successfully isolated from secondary components reveal...

The opening of the East Vietnam Sea (EVS), leading to the activity of syn-spreading (33-16 Ma) and post-spreading (<16 Ma to today) volcanic activity. Syn-opening magma making up thick layers of tholeiitic basalt with a geochemical composition close to the refractory mid-ocean ridge basalt (MORB) is mainly distributed inside the EVS. The post-openi...

Nineteen sites with 198 oriented-core samples have been collected from the Upper Permian-Lower Triassic volcanic rocks of Vien Nam Formation at Quynh Nhai locality, Son La Province, northwestern Vietnam. The characteristic remanent magnetization components carried by magnetite and hematite were successfully isolated from secondary components reveal...

Nineteen sites with 198 oriented-core samples have been collected from the Upper Permian-Lower Triassic volcanic rocks of Vien Nam Formation at Quynh Nhai locality, Son La Province, northwestern Vietnam. The characteristic remanent magnetization components carried by magnetite and hematite were successfully isolated from secondary components reveal...

For the first time, this paper presents the distribution of gases (CO2, hydrocarbon C1-C4, H2, He) in 39 gas samples in bottom sediments from 19 gravity cores located in the southwestern sub-basin of the South China Sea (known as Bien Dong). The surface sediments in the studied area are mostly clay and silty clay (mud). In general, the concentratio...

For the first time, this paper presents the distribution of gases (CO2, hydrocarbon C1-C4, H2, He) in 39 gas samples in bottom sediments from 19 gravity cores located in the southwestern sub-basin of the South China Sea (known as Bien Dong). The surface sediments in the studied area are mostly silty clay. In general, the concentration of methane va...

Phu Quy volcanic island is formed following at least two major volcanic eruptions at ca. 2.64 Ma and 1.32 Ma. The early episode appeared as fissure eruptions producing a shield-like basement comprising of tholeiitic basalt to sub-alkaline (olivine basalt). The later episode occurred as a monogenic volcanic, explosive eruption producing mainly sub-a...

The pegmatoid intrusions of the Nui Chua complex are one of the important mafic-ultramafic intrusive series associated with Fe-Ti-V ores in northern Vietnam. These intrusions consist of plagiowebsterite, clinopyroxenite, melanogabbronorite, mesogabbro, gabbronorite, and leucogabbronorite. The Fe-Ti oxide ores being massive or disseminated appear la...

Recent studies suggest the existence of two ophiolites in Palawan Island: the Central Palawan Ophiolite (CPO) and the Southern Palawan Ophiolite (SPO). New geochemical data in this study from the volcanic rocks of the Palawan ophiolites further support this interpretation. The CPO lavas have back-arc basin basalt (BABB) affinities with LILE enrichm...

Metasomatism is the prime process to create compositional heterogeneity of the upper mantle. Mineralogical and mineral chemical changes of the mantle triggered by metasomatism can be used to deduce the nature of the metasomatic agent(s) and to constrain the timing of metasomatism. This information is vital for an understanding of the secular evolut...

Ba River originates from the Ngoc Linh mountain ranges, NW of Kontum massif and flows into the East Sea from the Da Rang estuary. The Ba River basin (Da Rang river) is considered as the means of transport and storage of products from the Kontum massif resulted following weathering, erosion or deformation processes either by natural causes or the re...

The Southwestern part of the Central Oceanic Basin of the East Vietnam Sea is the transition zone between Southeast continental shelf and the East Sea oceanic crust. The topography of the seabed in the study area is characterized by a bottom divergence zone, subsidence along the Northeast-Southwest spreading ridge axis with the depth ranging from 3...

Onshore Vietnam contains a complex series of faults coupled with a diffuse igneous province that has been active since the mid-Miocene. However, there are several conflicting fault maps in the literature and no consensus concerning the relative age of mapped faults and Neogene basalt flows, which becomes problematic when trying to use structural da...

The calculations which determine the chemical composition of the primitive magma are simple but they show changes in the temperature and pressure states of the magma source. The method is based on the addition of the chemical composition of the Olivine to the major element composition of the eruptive rocks which follows the formula: C i = C i-1 + 0...

The calculations which determine the chemical composition of the primitive magma are simple but they show changes in the temperature and pressure states of the magma source. The method is based on the addition of the chemical composition of the Olivine to the major element composition of the eruptive rocks which follows the formula: Ci = Ci-1+ 0.1...

The late Cenozoic Southwest Japan arc was formed by hot subduction of the young Shikoku Basin slab, and Daisen Volcano has erupted exclusively adakitic products since ca.1.0 Ma under this subduction regime. Although previous studies have revealed that the adakites of this arc were generated by melting of the subducted basaltic crust and incorporati...

This paper presents review of dissolved Rare Earth Elements (REE) and methane anomalies distribution in the East China Sea water column. In general, the REE concentrations of the shelf water are markedly higher than those of Okinawa Trough water in the East China Sea. Rare earth elemental concentrations in the Okinawa Trough water mainly governed b...

Basaltic and related- pyroclastic products aged 0.67, 0.46 and 0.2 Ma produced by eruption of Chư B'luk (Buon Choah), Phu Son (Pass 52, Quang Phu) volcanoes in the Krông Nô district, and Ea T’ling and Nam Dong volcanoes in the Cu Jut district covers an area of 120 km2 with a thickness of a few meters to about 80 m. The volcanoes are aligned along a...

Eruption of (74-26 ka old) pyroclastic (pumice fall) flow deposits of the Quaternary Gölcük volcano, Isparta, SW Turkey, carried a cargo of Western Anatolian’s youngest monzonitic-syenitic ejecta, 40Ar-39Ar hornblende ages range 313+64 - 268+43 ka, and indicate that a shallow level felsic plutonic complex existed underneath the crater. These ejecta...

Basaltic and related-pyroclastic products aged of 0.67, 0.46 and 0.2 Ma produced by eruption of Chư B'luk (Buon Choah), Phu Son (Pass 52, Quang Phu) volcanoes in the Krông Nô District, and Ea T'ling and Nam Dong volcanoes in the Cu Jut District make up a plateau about 120km 2 in area, and a few meters to about 80m thick. The volcanoes are aligned a...

Four Cenozoic volcanic units with a total thickness varying from 30 to 250 meters occur in the Bolaven Plateau in an area of about 50km by 80km. The basalt overlies a thick succession of Jurassic-Cretaceous sandstone and mudstone. The oldest and most voluminous unit consists of pyroxene basalt dated at 121.4 ±3.1Ma and 40.0 ±1.3Ma. This unit is ove...

The paper presents the initial results of the study of volcanic cave system and its typical formations in Krongno Volcano Geopark (KVG), Dak Nong, Vietnam. The volcanic caves have been discovered since 2007, under UNESCO sponsored the scientific project, are seen as unique geological heritages. The collaborative surveys and studies between Vietname...

A set of 72 low-volume seawater samples (25 mL) collected from 9 stations in the East China Sea in 2009 and 2011 is analyzed for dissolved rare earth element (REE) concentrations. The elemental concentrations in continental shelf waters are markedly higher than those from the shelf slope and Okinawa Trough waters. The transition in the REE concentr...

Study of petrological and geochemical characteristics of mantle peridotite xenoliths in Pliocene alkaline basalt in Nghia Dan (West Nghe An) was carried out. Rock-forming clinopyroxenes, the major trace element containers, were separated from the xenoliths to analyze for major, trace element and Sr-Nd isotopic compositions. The data were interprete...

The chemical compositions of late Miocene-Pleistocene basalts in PhuQuy island defines two major geochemical groups that reflect the formation and development of the island. The early low alkaline, TiO 2 and P 2 O 5 , and high SiO 2 group, comprising olivine and tholeiitic basalts, forms the base of the island. The later high alkaline, TiO 2 , and...

Cam Thuy Permian basalts consisting of thick lava flows and pyroclastic layers appear along both sides of the Song Ma fault zone in Thanh Hoa and in Son La and Ninh Binh provinces, NW Vietnam. The magmatism has been thought to have genetic relationship with Permian volcanism in the Song Da rift zone, which is believed to be part of the Emeishan lar...

Vietnam is an important source of peridot for the international gem market. Gemological and geochemical characteristics of Vietnamese peridot from the Central Highlands are similar to those noted for other localities originating from xenoliths in alkaline basalts. This peridot was derived from a spinel lherzolite source and appeared to form at temp...

A set of samples including porphyritic rhyolite, rhyo-trachyte, trachyte and basalt was collected in the Tram Tau district, Tu Le Mesozoic Basin, in NW Viet Nam for analysis for major, trace, elemental and Rb-Sr and Sm-Nd isotopic compositions. The volcanic rocks are alkaline and highly enriched in trace elements including rare earth elements (REEs...

A set of samples including porphyritic rhyolite, rhyo-trachyte, trachyte and basalt was collected in the Tram Tau district, Tu Le Mesozoic Basin, in NW Viet Nam for analysis for major, trace, elemental and Rb-Sr and Sm-Nd isotopic compositions. The volcanic rocks are alkaline and highly enriched in trace elements including rare earth elements (REEs...

Nghia Dan Neogene basalts occur as monogenetic volcanoes and thin lava layers (up to tens of meters thick). They are alkaline basalts and basanites, some containing mantle xenoliths such as spinel lherzolite. Compared with Tay Nguyen (Western Highlands) Cenozoic basalts (for example, Pleiku and DacNong) the Nghia Dan basalts show much lower S2i O (...

During the closure of paleo- and neo-Tethys the accretion of continental fragments to southern Eurasia involved diverse geodynamic and magmatic processes; although this special issue does not attempt to review these in detail our purpose is to draw attention to recent relevant research presented at the ad hoc symposium “Tectonics of the Red River F...

The papers reports and compares the geochemistry and petrology of Cenozoic basaltic rocks from Bolaven Plateau (Southern Laos) and Nghia Dan (West Nghe An, Vietnam). This is the first ever reported on geochemical and isotopic characteristics of basalt from the two regions. The similarity in geochemical and petrologic features of basalts in the two...

Neogene-Quaternary basalts occur as dispersed volcanic clusters in the vicinity of the Tethyan tectonic belt, possibly representing ‘far-field’ effects of the Early Tertiary collisions of Gondwana fragments with the southern margin of Eurasia. In Indochina, such a ‘Diffuse Igneous Province’ post-dates the 45–42 Ma ‘hard’ India-Asia collision and so...

Two types of K-rich magma of Eocene to Early Oligocene (ca. 40–30) and Plio-Pleistocene (ca. 5–0.1 Ma) age were emplaced prior to and following left-lateral slip on the Ailao Shan-Red River (ASRR) fault, a regional shear zone extending between southwest China and the Tonkin Gulf (South China Sea) that accommodated ‘escape’ of the Indochina block. T...

We present geochemical, Sr, Nd and Pb isotopic data for the youngest back-arc tholeiitic and alkali basalts in the southern tip of Goto Islands along the Taiwan-Shinji Folded Belt in northwestern Kyushu, SW Japan. The data are compared with those more-or-less contemporaneous back-arc basalts elsewhere in the region and interpreted accordingly. Our...

More than 350 kimberlite pipes and clusters have been found in Tanzania up to date. Many of the occurrences are found in and around Shinyanga, northern Tanzania. They are characterised by the presence of crater deposits, suggesting that minimal erosion has taken place in this region since Neogene times (~50 Ma) when the kimberlites were emplaced. T...

New trace-element, radiogenic isotopic, and geochronologic data from the Troodos ophiolite, considered in concert with the large body of previously published data, give new insight into the tectonic history of this storied ophiolite, as well as demonstrating the variability of suprasubduction-zone ophiolites, and differences between them and common...

A study of active tectonic development in Vietnam is of great importance. Right lateral strike-slip offsets along the Red River fault during the Pliocene‐present are determined by analyzing tributaries, Quaternary alluvial fans, river valley from Landsat, SPOT images, detailed topographical maps and field observation. Along the SW fault of the Red...

Two types of K-rich magma of Eocene to Early Oligocene (ca. 40–30) and Plio-Pleistocene (ca. 5–0.1 Ma) age were emplaced prior to and following left-lateral slip on the Ailao Shan-Red River (ASRR) fault, a regional shear zone extending between southwest China and the Tonkin Gulf (South China Sea) that accommodated ‘escape’ of the Indochina block. T...

Despite the existence of a growing database of the amount of H2O in melt inclusions, it is difficult to calculate the bulk H2O content for vapor-saturated magma because the observable H2O concentration in melt is limited by its solubility. To overcome this problem, we focus on K2O, which shows similar geochemical behavior to H2O but is largely reta...

Episodic extensional basins of Isparta Angle (SW Turkey) host similar post-collisional mafic (Si-poor and Si-rich) potassic rock types (e.g., lamproite, leucite-basalt, lamprophyre, absarokite, shoshonite) with contrasting geochemical signatures within the distinct geographical locations (e.g. orogenic-types at north, transitional-types at centre a...

Geochemical and isotopic data are reported for 20 Ma high-magnesian andesite (HMA) lavas erupted on the forearc side of Central Japan in the Choshi coastal area (Chiba). Rarely olivine-phyric (< 3% vol), these rocks have ca. 56 wt.% SiO2, Na2O ranging between 3.9 and 4.2 wt.%, and relatively low K2O/Na2O ratios (ca. 0.44). Their Mg numbers are rela...

During Japan Sea back-arc opening between 21 and 15 Ma, low-K tholeiitic basalts erupted in the Abukuma Mountains on the trench side of NE Japan. The basaltic rocks in this region are divided into two units by a hiatus. The lower unit consists of the 20 Ma Tenmyosan volcanic rocks, including many monogenetic basaltic volcanoes whose vents occur thr...

New Sr, Nd, and Pb isotopic data for Cenozoic basalts from northwest Kyushu, Japan and the Okinawa Trough, suggest that mantle sources feeding the Ryukyu ‘back-arc’ side volcanoes, represent a mixture of Pacific N-MORB mantle with EM2-rich components, with little or no EM1. The compositions of these basalts differ fundamentally from those character...

Island chains off western Kyushu are the surface exposure in the northern margin of the Taiwan–Sinzi Folded Zone that spreads along the arc–trench system in the back-arc side from SW Japan to Taiwan. Intermittent igneous activity between the Middle Miocene and Holocene occurred on these islands and widely covered or intruded sedimentary rocks of Ea...

Fukuoka volcanic field in northern Kyushu (Japan) is comprised of scattered small, monogenetic volcanoes with ages ranging from 1.1 to 4.4 Ma. A set of samples from the area, together with some from nearby localities, was collected and analyzed for major and trace element abundances and Sr, Nd and Pb isotope compositions. The basalts, unlike lavas...

Geologic, geochronologic and geochemical studies are performed on Pliocene-Quaternary volcanic rocks in the back-arc region of SW Japan in order to verify the relationship between back-arc volcanism and regional tecotnism. Shimabara Peninsula is located in the western Kyushu Island, and Pliocene-Quaternary volcanic rocks cover most of its surface....

Western Pacific basins are characterized by three remarkable attributes: (1) complex kinematic histories linked to global-scale plate interactions; (2) DUPAL-like contaminated mantle; and (3) rapid post-Mesozoic rollback of the confining arc-trench systems. The coincidence of slab steepening, extreme arc curvature, and vigorous basin opening associ...

Basalt magmatism occurred throughout east and southeast Asia after the early Tertiary India–Asia collision. This activity does not conform to the ‘Large Igneous Province’ model in view of lower eruption and melt production rates, wide dispersal of centres and the apparent absence of deep mantle upwelling. Age data for Vietnamese plateau basalts ref...

Intraplate magmatism affected much of Indochina following the mid-Miocene cessation of South China Sea opening. Thick basalt plateaus formed on accreted terrains of varying age as extensional fractures were reactivated following the Indo-Eurasian collision. The basalts are part of a diffuse igneous province affecting much of eastern and southeaster...

Cenozoic intraplate basalts in Indochina are the most voluminous in southeast Asia and represent excess melting during post-extrusion lithoshere extention. In common with oceanic island and slow-spreading ridge segments, individual centers of the Indochina province exhabit discrete compositional 'vectors' characterised by negative correlations of (...

Cenozoic basalts in Indochina are part of a regional melting episode along the rifted Eurasian margin. Trace element and isotopic compositions of Vietnamese beasalts are used to place constraints on the extent of lithosperic and asthenosphere contributions to the melts and possible mantel dynamic implications. The 87Sr/86Sr, 207Pb/204pb, and 204Pb/...