Eocene-Oligocene syn-rift deposition in the northern Gulf of Tonkin, Vietnam

Fyhn, Michael B.W.; Hoang, B.H.; Anh, N.T.; Hovikoski, Jussi; Cuong, Tong D.; Dung, Bui Viet; Olivarius, Mette; Tuấn, Nguyễn Quốc; Toan, Do Minh; Tùng, Nguyễn Thanh; Huyen, Nguyen Thu; Cuong, Trinh Xuan; Nytoft, Hans Peter; Abatzis, Ioannis; Nielsen, Lars Henrik

doi:10.1016/j.marpetgeo.2019.08.041

Cited by 16 publications

(10 citation statements)

References 26 publications

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“…The postulated Late Eocene-Early Oligocene at youngest age of the studied deposits is not in agreement with previous dating efforts suggesting the sediments were deposited during Oligocene/Miocene (e.g., Petersen et al, 2001Petersen et al, , 2005Thanh & Khuc, 2006;Trung et al, 1999) (Figure 3). However, it does align well with results obtained for the basins associated with the Cao Bang-Tien Yen Fault (Böhme et al, 2011(Böhme et al, , 2013Wysocka et al, 2018Wysocka et al, , 2020, and more generally with regional interpretations of Eocene-Oligocene syn-rift deposition in the northern Gulf of Tonkin (Fyhn et al, 2020). Therefore, we suggest there is no need to distinguish the Dong Ho and Tieu Giao formations (Figure 3).…”

Section: Age Determinationsupporting

confidence: 92%

“…Moreover, in northern Vietnam, there are at least a dozen small areas in which Palaeogene and Neogene deposits crop out (Figure 1b). In most cases, they are paltry erosional patches and constitute remnants of a larger sedimentary terrestrial system (Clift et al, 2020;Fyhn et al, 2020;Wysocka et al, 2020). Only some of them are big enough to be treated as basins with fully developed sedimentary patterns (e.g., Böhme et al, 2011Böhme et al, , 2013Wysocka, 2009;Wysocka et al, 2018Wysocka et al, , 2020Wysocka & Świerczewska, 2003Wysocka & Świerczewska, , 2010.…”

Section: Geological Settingmentioning

confidence: 99%

“…A latest Oligocene-Earliest Miocene inversion and basement rock exhumation drove the uplift and partial removal of the syn-rift deposits (Fyhn et al, 2018). 14b), and is related to the Kien An and Tien Long faults (for the exact location and more details, see Fyhn et al, 2018Fyhn et al, , 2020. The Kien An Basin is undrilled, and all facies interpretation have been based on only seismic data.…”

Section: Evolution Of Thementioning

confidence: 99%

“…These investigations, and the resultant publications, have been based on rich collections of seismic/drill-hole geophysical and petrophysical data collected offshore and supplemented by the thermochronological and geochemical data on the onshore igneous and metamorphic massifs (e.g., Anczkiewicz et al, 2007;Leloup et al, 2001;Wang, Lo, Chung, Lee, & Thang, 2000). The origin and evolution of these offshore basins, such as the Song Hong, Qiongdongnan, and Beibuwan basins, are thus well-established and understood (e.g., Clift, Blusztajn, & Duc, 2006;Clift, Lee, Clark, & Blusztajn, 2002;Clift & Sun, 2006;Fyhn et al, 2018Fyhn et al, , 2020Morley, 2002Morley, , 2007Rangin, Klein, Roques, Le Pichon, & Trong, 1995;Ren, Tamaki, Li, & Junxia, 2002;Su, White, & Mckenzie, 1989). By contrast, there is still a need for a coherent model describing the origin and evolution of the tectonically influenced Palaeogene sedimentary system extending over the landward area of northern Vietnam.…”

Section: Introductionmentioning

confidence: 99%

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The Hoanh Bo Trough‐a landward keyhole to the syn‐rift Late Eocene–Early Oligocene terrestrial succession of the northern Song Hong Basin (onshore north‐east Vietnam)

et al. 2022

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Located on the northern Vietnam onshore/offshore transition, the Hoanh Bo Trough is an excellently exposed terrestrial Palaeogene sedimentary sequence that may be treated as an analogue for regional interpretations of the sedimentary and structural evolution of the northern Song Hong Basin. The Hoanh Bo Trough lies to the north of the northern Song Hong Basin and to the west of the Beibuwan Basin, the origin and evolution of which are linked with Palaeogene South China Sea rifting. Field and archival well sedimentological observations were made throughout the Palaeogene succession of the Hoanh Bo Trough, and samples were collected for palynological, petrographical, and geochemical analysis. Based on the coexistence of particular lithofacies, proximal alluvial fan, distal alluvial fan, fluvial alluvial plain with channels, alluvial plain and/or lake margin, and lacustrine facies associations were distinguished. Palynological analyses suggest the sedimentary infill of the Hoanh Bo Trough is of the Late Eocene-Early Oligocene age and was deposited in a very warm tropical/subtropical climate. In turn, geochemical results demonstrate that the deposits have intermediate chemical maturity and were probably reworked from older sedimentary rock sources. Moreover, it is suggested to combine the Dong Ho and Tieu Giao formations and synonymize them as the Dong Ho Formation. The sedimentary pattern, age, climatic conditions, and structural evolution of the Hoanh Bo Trough align well with the rift initiation, rift development, and rift termination tectonic system tracts. Moreover, the Hoanh Bo Trough could be treated as a landward keyhole for the offshore basins: for instance, the Kien An Basin in the northern Song

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Section: Age Determinationsupporting

confidence: 92%

Section: Geological Settingmentioning

confidence: 99%

Section: Evolution Of Thementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Hoanh Bo Trough‐a landward keyhole to the syn‐rift Late Eocene–Early Oligocene terrestrial succession of the northern Song Hong Basin (onshore north‐east Vietnam)

et al. 2022

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“…Previous studies have indicated that the deposits represent syn-rift lake sediments and that the main border fault was located a few km to the East from the study locality 47 (Fig. 1b).…”

Section: Discussionmentioning

confidence: 85%

Factors controlling accumulation of organic carbon in a rift-lake, Oligocene Vietnam

Rizzi

Hovikoski

Schovsbo

et al. 2020

Sci Rep

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Understanding of the processes of petroleum source rock (SR) accumulation in lacustrine rift basins and the behavior of lake systems as long-term carbon sinks is fragmentary. Investigation of an 800 m thick (500 m core and ~ 300 m outcrop), deep-lacustrine, Oligocene section in Vietnam, provides a rare insight into the controls and deposition of organic carbon (OC) and SR formation in continental rift basins. A multidisciplinary dataset, combining elemental data, inorganic and organic geochemistry with sedimentology, shows that the richest alginite-prone, sapropelic SR developed during periods of relative tectonic quiescence characterized by moderate primary productivity in a mainly dysoxic lacustrine basin. Increased rift activity and further development of graben morphology intensified water column stratification and anoxia, which hindered nutrient recycling. Sapropelic organic matter (OM) continued to accumulate, but with increasing amorphous OM content and decreasing total OC values. Periods of increased seasonality were characterized by thermocline weakening, enhanced mixing of water columns, increased primary productivity and diatom blooming. The results suggest that a change from dysoxia towards anoxia or extreme primary productivity does not necessarily enhance OC burial and SR quality. External nutrient input from a phosphate-rich hinterland is sufficient for sapropel formation, whereas the main limiting factor is methanogenesis.

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Geochemical constraints on weathering and provenance of stream sediments from Bat Xat, northwestern Vietnam

Tran,

Nguyen,

Pham

et al. 2024

Applied Geochemistry

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Eocene-Oligocene syn-rift deposition in the northern Gulf of Tonkin, Vietnam

Cited by 16 publications

References 26 publications

The Hoanh Bo Trough‐a landward keyhole to the syn‐rift Late Eocene–Early Oligocene terrestrial succession of the northern Song Hong Basin (onshore north‐east Vietnam)

The Hoanh Bo Trough‐a landward keyhole to the syn‐rift Late Eocene–Early Oligocene terrestrial succession of the northern Song Hong Basin (onshore north‐east Vietnam)

Factors controlling accumulation of organic carbon in a rift-lake, Oligocene Vietnam

Geochemical constraints on weathering and provenance of stream sediments from Bat Xat, northwestern Vietnam

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