Morphotectonic properties of the Lo River Fault near Tam Dao in North Vietnam

Cường, Nguyễn Quốc; Zuchiewicz, Witold

doi:10.5194/nhess-1-15-2001

Cited by 92 publications

(47 citation statements)

References 6 publications

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“…In the aspect of tectonics, the Hoanh Bo Basin is situated in the eastern part of the Red River Fault Zone, where the Day Nui Con Voi Massif is present, and it has key significance for understanding of the Paleogene-Neogene geodynamic evolution of the southeast Asia (Cuong & Zuchiewicz 2001, Cuong 2007.…”

Section: Introductionmentioning

confidence: 99%

Lithofacies and depositional environments of the Paleogene / Neogene sediments in the Hoanh Bo Basin (Quang Ninh province, NE Vietnam)

Hoang¹,

Wysocka²,

Phan³

et al. 2015

geol

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Abstract:The Hoanh Bo Basin is a multiple period formed basin which is associated with the tectonic mechanism due to the activity of the Chi Linh-Hon Gai and Trung Luong Faults during the late Paleogene -early Neogene time. The basin is filled with continental sediments, comprising mainly polymictic conglomerates, sandstones, siltstones, claystones and shales. Coarser-grained polymictic deposits predominate along the northern and western margins of the basin, while different types of siltstones, claystones, even sandstones occur in its center, as well as along its southern and eastern parts toward the Ha Long Bay. The source rocks for sedimentary materials are mainly originated from rocks of the Hon Gai and Ha Coi Formations.Based on the dominant grain-size class, texture, stratification, degree of clast rounding and sorting, 17 lithofacies were determined in the Hoanh Bo Basin infill. The basin is filled by gravelly, sandy and fine-grained lithofacies just covers a modest area but it represents a full of succession of 4 depositional systems including alluvial fan, fluvial, deltaic and lacustrine environments. Alluvial fan and fluvial environments are characterized by an assemblage of lithofacies such as sand-and mud-supported disorganized breccias (Gb), clast-to sand-supported conglomerates (Gmm), clast-supported inverse-graded conglomerates (Gig), planar-cross-bedded conglomerates (Gp), trough cross-bedded conglomerates (Gt), horizontally stratified conglomerates (Gh), planar cross-bedded sandstones (Sp), trough cross-bedded sandstones (St), ripple cross-laminated sandstones (Sr), horizontally bedded sandstones (Sh), massive sandstones (Sm), massive mudstones, siltstones (Fsm), laminated siltstones and mudstones (Fl), massive claystones (Fm) and coaly lithofacies (C); the deltaic assemblage is dominated by planar-cross-bedded conglomerates (Gp), horizontally stratified conglomerates (Gh), planar cross-bedded sandstones (Sp), horizontally bedded sandstones (Sh), low-angle cross-bedded sandstones (Sl); while the lacustrine assemblage consists of ripple cross-laminated sandstones (Sr), horizontally bedded sandstones (Sh), normally graded sandstones (Sng), massive mudstones, siltstones (Fsm), laminated siltstones and mudstones (Fl), massive claystones (Fm) and coaly lithofacies (C).

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Section: Introductionmentioning

confidence: 99%

Lithofacies and depositional environments of the Paleogene / Neogene sediments in the Hoanh Bo Basin (Quang Ninh province, NE Vietnam)

Hoang¹,

Wysocka²,

Phan³

et al. 2015

geol

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“…1(a)). A number of other obvious fault zones have been reported in this region, such as the Cao Bang-Tien Yen (Cuong et al, 2006), Dong Trieu (Charusiri et al, 2002), Song Ca (Takemoto et al, 2005), Song Chay (Cuong and Zuchiewicz, 2001), and Song Da and Song Ma (Phoung, 1991) fault zones (nos. 1, 5, 40, 41, 42, and 43 in Fig.…”

Section: Active Fault Datamentioning

confidence: 99%

Deterministic and probabilistic seismic hazard analyses in Thailand and adjacent areas using active fault data

2009

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Seismic hazards in Thailand and adjacent areas were analyzed mainly on the basis of geological fault data. We identified 55 active fault zones using remote-sensing data on earthquake source parameters derived from both active fault data and earthquake catalogues. We selected strong ground-motion attenuation models by comparing the application of several candidate models with strong ground-motion data recorded in Thailand. Both deterministic (DSHA) and probabilistic (PSHA) approaches were used-DSHA for the design of critical construction and PSHA for the design of non-critical construction. We also applied two frequency-magnitude models in the PSHA approach: the exponential magnitude distribution model and the characteristic earthquake model. The seismic hazard results obtained using the deterministic and probabilistic approaches are not equivalent. The resulting DSHA map reveals extremely high seismic hazard levels in some areas of Thailand and in surrounding countries, while the PSHA map reveals a seismic hazard distribution similar to that of the DSHA but with lower seismic hazard levels. The areas of high seismic hazard include countries neighboring Thailand, such as Myanmar, Laos, Vietnam, and Indonesia (Sumatra Island), and areas within Thailand itself, primarily those areas in northern, western, and southern Thailand that are dominated by active fault zones.

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“…The V f index has seldom been applied to active tectonic areas in the tropics. A V f analysis along the Lo River Fault in northern Vietnam produced low values (0.06 to 0.61), indicating recent uplift upon the fault (Cuong and Zuchiewicz, 2001).…”

Section: Ratio Of Valley Floor Width To Valley Height (Vf )mentioning

confidence: 99%

“…Morley et al (2007) and Fenton et al (2003) suggested that the fault is characterized mainly by normal dip-slip and subordinate left-lateral slip. (Cuong and Zuchiewicz, 2001).…”

Section: Sense Of Fault Movementmentioning

confidence: 99%

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Re-evaluation of the activity of the Thoen Fault in the Lampang Basin, northern Thailand, based on geomorphology and geochronology

et al. 2011

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We applied remote sensing techniques and geomorphic index analysis to a study of the NE-SW-striking Thoen Fault, Lampang Basin, northern Thailand. Morphotectonic landforms, formed by normal faulting in the basin, include fault scarps, triangular facets, wine-glass canyons, and a linear mountain front. Along the Thoen Fault, the stream length gradient index records steeper slopes near the mountain front; the index values are possibly related to a normal fault system. Moreover, we obtained low values of the ratio of the valley floor width to valley height (0.44-2.75), and of mountain-front sinuosity (1.11-1.82) along various segments of the fault. These geomorphic indices suggest tectonic activity involving dip-slip displacement on faults. Although the geomorphology and geomorphic indices in the study area indicate active normal faulting, sedimentary units exposed in a trench at Ban Don Fai show no evidence of recent fault movement. In Ban Don Fai trench No. 2, accelerator mass spectrometry radiocarbon (AMS) ages and optically stimulated luminescence (OSL) ages indicate that deposition of the lowest exposed sedimentary unit occurred between 960 and 910 years ago. Therefore, the most recent movement upon the Ban Don Fai segment of the Thoen Fault occurred more than 960 years ago.

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Morphotectonic properties of the Lo River Fault near Tam Dao in North Vietnam

Cited by 92 publications

References 6 publications

Lithofacies and depositional environments of the Paleogene / Neogene sediments in the Hoanh Bo Basin (Quang Ninh province, NE Vietnam)

Lithofacies and depositional environments of the Paleogene / Neogene sediments in the Hoanh Bo Basin (Quang Ninh province, NE Vietnam)

Deterministic and probabilistic seismic hazard analyses in Thailand and adjacent areas using active fault data

Re-evaluation of the activity of the Thoen Fault in the Lampang Basin, northern Thailand, based on geomorphology and geochronology

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