Thanh Ngo

Hanoi University of Mining and Geology · Department of Geology

The east-west trending middle and lower courses of the Cai River, central Vietnam, are underlain by a geologically complicated basement, which was strongly deformed by multiphase tectonic activities. Active tectonism is intensely, indicated by wide-spread brittle faulting, fracturing, significant uplifting or subsidence, and other tectono-geomorpho...

The eastern Paleo-Tethyan Jinshajiang–Ailaoshan–Song Ma (JASM) orogenic belt in the Southeast Tibetan Plateau represents the tectonic boundary between the Indochina and South China blocks. Regional Cenozoic lithospheric strike-slip movements caused by the India–Asia collision have modified many of the pristine geological records associated with the...

The Indochina Block is considered as a part of the Indian and Australian margins of Gondwana, and the Tam Ky‐Phuoc Son Suture Zone (TPSZ) lies in its central region as the boundary between the Truong Son Belt and Kon Tum Massif (KTM). However, the early Palaeozoic tectonic nature and timing of magmatism within the TPSZ are still controversial. To t...

The Chu Lai granitogneiss is widespread throught the Northern Kontum massif. The Chu Lai body is located in the W-SW of the Nui Thanh Townlet (Nui Thanh Dists., Quang Nam Prov.). On an areas of ~ 300 km2. The Chu Lai intrusion mainly consists two mica gneiss, it is light grey and have porphyritic textures. Its major minerals include plagioclase (25...

Data for the research entitled " Bilateral heterogeneity in an upwelling mantle via double subduction of oceanic lithosphere" by Dao et al., 2022 published in the Journal of Geophysical Research: Solid Earth. (https://doi.org/10.5281/zenodo.6534055)

Vietnam is a major field of Cenozoic volcanism in Southeast (SE) Asia. Two contrasting models have been proposed to explain the mantle upwelling and volcanism in this region; collision of the Indian and Eurasian continents or subduction of the Pacific or Indo‐Australian oceanic lithosphere. To place constraints on the origin of the intraplate volca...

The gabbro and plagiogranite magmas of the Ngoc Hoi and Dieng Bong complexes are mainly distributed in the northern part of the Kon Tum block. They were previously considered parts of the Tam Ky - Phuoc Son ophiolite complex. In this study, 02 samples of gabbro and plagiogranite were collected from the Hiep Duc area. Petrographic characteristics sh...

The Nam O - Nam Dong fault is rated as one of the most seismic source zones in Central Vietnam. Field investigation in the mountainous areas in the Cam Le and Hoa Vang districts (Da Nang city), which is a part of the Nam O - Nam Dong fault zone, the authors have discovered fault gouge zone of 5-40 cm width within the Dai Loc granitic rock. Two faul...

The garnet-bearing schists of the Nam Co formation have an identical mineral assemblage consisting of garnet, chlorte, albite, quartz and muscovite, together with accessory apatite, zircon, monazite, xenotime, and ilmenite. An aggregate of muscovite and chlorite defines the major foliations (Sn). Both albite and garnet occur as a porphyroblast, ran...

The northern Kon Tum terrane in central Vietnam, one of the most key tectonic terranes of the Indochina block, consists of numerous volcano-plutonic complexes of the Neoproterozoic to Cenozoic ages. Permo-Triassic granites and granodiorite in the terrane have both I- and S-type geochemical affinities. Two granitic samples collected from the norther...

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...

The mainstream of the Thu Bồn river system flows through Nam Trà Mi, Bắc Trà Mi, Hiệp Đức, Nông Sơn, Duy Xuyên, Điện Bàn and Hội An. The river system has been changing drastically its flow in recent years causing landslide erosion, sediment accumulation, droughts and floods occur quite frequently in the river system. The river system changing as we...

The Truong Son and Kon Tum terranes in northeastern Indochina are thought to, respectively, form part of the Indian and Australian margins of Gondwana and separated one another by the Tam Ky–Phuoc Son Ocean during the early Paleozoic. In this paper, we present results of a comprehensive geochronological and geochemical study on a trondhjemite–tonal...

The electron spin resonance dating method (ESR) has been widely used in the world for active tectonic research. However, in Vietnam this method has not been widely applied. In this paper, 03 gouge faults samples were taken in NE - SW trending fault systems occurred in the central portion of Vu Gia - Thu Bon river basin. The samples were processed t...

The depositional and metamorphic ages, and provenances of metasedimentary rocks from the Nam Co Complex in the Son La area, Song Ma Suture Zone, northwestern Vietnam, were investigated in order to reveal the convergent tectonic history between the Indochina and South China cratons. This complex is structurally characterized by an antiformal metamor...

The Northeast Vietnam is offered critical clues on convergent margin tectonics of South China and Indochina blocks. In this area, mafic-ul-tramafic rocks scattered along Cao Bang-Tien Yen fault zone. Here we present petrological, mineral composition data from the ultramafic rocks from the Cao Bang areas, Northeastern Vietnam. The data will contribu...

The metagranite, that still preserves the igneous structure, is composed mainly of K–feldspar, plagioclase, quartz, biotite, white mica and accessory ilmenite. Quartz, K–feldspar, plagioclase and biotite preserve the original igneous shape, but are either re–equilibrated or replaced by new phases. Quartz occurs as fine–grained granoblastic aggregat...

Constraining the timing of fault zone origin and movement history is of fundamental geotectonic importance to understand the evolution and processes of the brittle fault structures. The authors present in this paper authigenic illite K–Ar age data from the fault gouge samples, collected from the Dien Bien Phu Fault (DBPF) in the Dien Bien province,...

Constraining the timing of fault zone formation is fundamentally important in terms of geotectonics to understand structural evolution and brittle fault processes. This paper presents the first authigenic illite K-Ar age data from fault gouge samples collected from the Red River Shear Zone at Lao Cai province, Vietnam. The fault gouge samples were...

The Song Ma zone in NW Vietnam bears important tectonic implications as a potential subduction corridor between the Indochina and South China blocks. On the basis of U–Pb ages, the Hf isotopic characteristics of zircons and the geochemical composition of granitoids, a two-stage magmatic evolution process of the Song Ma zone at ~290–260 and ~245–230...

High-pressure and ultra-high pressure (HP-UHP) blueschist- and eclogite-facies metabasaltic and metasedimentary rocks occur in four different tectonic units near Lago di Cignana, western Alps. We have determined K-Ar ages for white micas (matrix phengite and paragonite) from the Lago di Cignana UHP unit (LCU; 39–41 Ma); the lower and upper units of...

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The Song Ma region, which is located in the northwestern Vietnam represents the zone of amalgamation between Indochina and South China blocks. Numerous scattered ultramafic rocks occur in this region in association with Early to Middle Palaeozoic greenschists and paragneisses, and all these rocks were subjected to hydrous metamorphism and deformati...

Earthquake is currently one of the biggest concerns in Vietnam, especially, when a number of earthquakes recorded by seismometers in recent years imply the danger of earthquake in the country. In Vietnam, the recorded earthquakes were pinpointed as the consequence of stratigraphic movements along active fault zones. Identifying of the activities of...

Arc magmas, metavolcanics and hydrated mantle peridotite from the Hongseong area in western Gyeonggi massif provide evidence for Paleozoic subduction tectonics in the Korean Peninsula. Zircons in a tonalitic orthogmeiss from the Wolhyeonri complex dated in this study through SHRIMP U-Pb technique yield ages of ca. 437 Ma and ca. 414 Ma. In addition...

Nguyễn Thị Thanh Thảo, Ngô Xuân Thành Detailed studies of geology, petrology, mineral morphology and K-Ar geochronology of sericite from Sơn Bình sericite deposit (Hương Sơn, Hà Tĩnh) show that sericite is concentrated in several zones with thickness of 5-10 m extending in the same direction as the NW-SE striking faults, with a total thickness of t...

The serpentinites in the Sông Mã Suture Zone in Sơn La area are parts of the ultramafic massifs along the Sông Mã Suture Zone. They have been considered as parts of the ophiolitic complex formed due to the collision between the Indochina and South China Plates. The rocks are highly serpentinitized and strongly deformed. The chromites remaining in t...

Ar-Ar high resolution laser dating of phengites from UHP unit in Lago di Cignana area has revealed the excess argon-free phengite formed in UHP metamorphism (Gouzu et al., 2006) though the phengites from Dora-Maira massif gave often extremely older Ar-Ar ages in comparison with the ages expected from SHRIMP zircon age (cf. Scaillet, 1996). This is...

Arc magmas, metavolcanics and hydrated mantle peridotite from the Hongseong area in western Gyeonggi massif provide evidence for Paleozoic subduction tectonics in the Korean Peninsula. Zircons in a tonalitic orthogneiss from the Wolhyeonri complex dated in this study through SHRIMP U–Pb technique yield ages of ca. 437 Ma and ca. 414 Ma. In addition...

The northwestern Himalaya in India contains critical evidence of the convergent margin and collision tectonics between the Ladakh arc and the Karakoram block. Here we present new petrochemical and geochronological data from a forearc ophiolite at the Shyok‐Nubra river confluence. Whole-rock geochemical data show relatively high large-ion lithophile...

Garnet–kyanite–staurolite gneiss in the Pangong complex, Ladakh Himalaya, contains porphyroblastic euhedral garnets, blades of kyanite and resorbed staurolite surrounded by a fine-grained muscovite-biotite matrix associated with a leucogranite layer. Sillimanite is absent. The gneiss contains two generations of garnet in cores and rims that represe...

The Sakuma–Tenryu district consists mainly of pelitic and basic schists. Its metamorphic sequence has been divided into two units, the Shirakura and the Sejiri units. We carried out K–Ar analyses of phengite separates and X‐ray diffraction analyses of carbonaceous materials from the pelitic schists of both units. The age–d002 relationships show tha...

The Bo Xinh ultramafics, north of the Song Ma fault zone are parts of the isolated bodies that have long been considered as remnants of Paleotethyan oceanic lithosphere between the Indochina and South China blocks. The core compositions of the early igneous stage Cr-spinels are used to deduce the petrogenesis and tectonic environments for the Bo Xi...

The Bakony-Balaton Highland Volcanic Field (BBHVF) is located in the central part of Transdanubia, Pannonian Basin, with over 50 alkali basaltic volcanoes. The basanite plug of Hegyestu erupted in the first phase of volcanic activity. K/Ar and Ar/Ar ages were published for the BBHVF. K/Ar and Ar/Ar ages of the leucite-bearing basanite of Hegyestás...

Petrographic analyses of plutons across the Karakoram fault in the Shyok-Nubra confluence of northern Ladakh area revealed that the rocks consist of diorite, granodiorite, granite and leucogranite. Pyroxene and biotite chemistries by EPMA indicate that most of the diorite, granodiorite and granite are calc-alkaline and formed in an arc-related tect...

The garnet-kyanite-staurolite and garnet-biotite-staurolite gneisses were collected from a locality within Lukung area that belongs to the Pangong metamorphic complex in Shyok valley, Ladakh Himalaya. The kyanitefree samples have garnet and staurolite in equilibrium, where garnets show euhedral texture and have flat compositional profile. On the ot...

DOI = 10.3126/hjs.v5i7.1229 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.18