Seismic architecture, stratigraphy and evolution of a subtropical marine embayment: Maputo Bay, Mozambique

Green, Andrew N.; Cooper, J. Andrew G.; Wiles, Errol; Lecea, Ander M. de

doi:10.1016/j.margeo.2015.06.005

Cited by 28 publications

(10 citation statements)

References 32 publications

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“…Van Heteren et al, 1998;Jol et al, 1996). Similar features have been documented from seismic investigations by Weber et al (2004) and Green et al (2015) from shelf and embayment settings and are directly comparable in terms of seismic architecture and geometry. Those examples were similarly interpreted as barrier systems that capped incised valley sequences.…”

Section: Interpretation Of Seismic Faciessupporting

confidence: 75%

Sandy barrier overstepping and preservation linked to rapid sea level rise and geological setting

et al. 2016

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In an era of global rising sea level quantifying future shoreline behaviour is a key societal concern. The potential for dramatic shoreline change via overstepping or barrier disintegration on barrierlagoon coasts as a result of future rapid sea level rise has been considered by various authors, but documented examples of barrier overstepping generally involve either coarse grain sizes or early diagenesis as beachrock. Where overstepping has been inferred, the overstepped barrier is seldom preserved. Using high resolution seismic data we describe the mid-Holocene overstepping of a sandy coastal barrier system and subsequent geomorphological changes that ultimately transformed it into a strandplain fronted by amuddy shoreface. This complete change in character is interpreted in the context of rapid sea level rise (tentatively linked to the 8.2 ka event) during which the former sandy shoreface-barrier was overstepped and decoupled from the contemporary shoreline, leaving the latter sand-starved. Upon overstepping, the wave-influenced shoreline was displaced rapidly to the landward margin of the former lagoon. Preservation of the overstepped uncohesive sandy barrier is attributed to the relatively wave-sheltered location, rapid sea level rise and rapid burial by shoreface sediments. This situation provides an insight into the conditions under which overstepping occurs, and thereby, the future response of barrier lagoon systems to predicted rapid rates of future sea level rise.

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Section: Interpretation Of Seismic Faciessupporting

confidence: 75%

Sandy barrier overstepping and preservation linked to rapid sea level rise and geological setting

et al. 2016

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“…Large tidal lagoons and impounded coastal lakes occur in the southern Cape at Wilderness, and on the northern KwaZulu-Natal and southern Mozambique coastal plain. Large marine embayments are present at Durban (Mkhize, 2013), Maputo (Green et al, 2015;De Lecea et al, 2017) and in the lee of the Bazaruto archipelago (Cooper and Pilkey, 2002;Armitage et al, 2006). Because they are protected from the high-energy surf, deposits in these marginal marine environments hold potential for preserving records of Holocene sea-level change, once due allowance is made for their variable hydrodynamic and sedimentary conditions.…”

Section: Study Areamentioning

confidence: 99%

Sea-level change in southern Africa since the Last Glacial Maximum

Cooper

Green

Compton

2018

Quaternary Science Reviews

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Sea-level change around southern Africa (southern Namibia, South Africa, southern Mozambique) since Termination I has been quantified using a variety of indicators. Existing and new data are reviewed to provide a baseline for future studies and identify key research needs and opportunities in the region. While the southern African records broadly agree with other far-field records, detailed Holocene records present as-yet unresolved discrepancies with glacial isostatic adjustment (GIA) model predictions. Two domains, the west coast and east coast are considered. Radiocarbon dated saltmarsh facies and marine shells in life position provide the basis for the west coast sea-level curve back to 9 cal. ka BP. Given the age and elevation uncertainties, a Mid-Holocene highstand of +2 to +4 m is suggested between 7.3 and 6 cal ka BP as are several Late Holocene oscillations of < 1 m amplitude. On the east coast, fewer data are available for the Mid to Late Holocene (post 7 cal. ka BP) compared to the west, but many submerged indicators are available back to 13 cal. ka BP. Reappraisal of existing data suggests a sea-level curve similar to that of the west coast. In both instances, the resolution of existing sea-level index points is neither sufficient to accurately constrain the magnitude and timing of the peak highstand nor the existence of minor inferred subsequent oscillations. Between 13 and 7 cal ka yr BP chronological and geomorphological evidence (submerged shoreline complexes) suggest several alternating periods of slow and rapid sea-level change. Despite abundant data, the indicator resolution to quantify these changes remains elusive.

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“…De este modo, el gas somero biogénico en el estuario de Bahía Blanca se originó bajo procesos evolutivos similares a los que originaron depósitos de gas somero biogénico en sistemas costeros de todo el mundo (Fig. 1, Parker & Paterlini 1990, Aliotta et al 2000, 2002, Missiaen et al 2002, García-Gil 2003, Bujalesky et al 2004, Emeis et al 2004, Lee et al 2005, Orange et al 2005, Schwarzer et al 2006, Iglesias & García-Gil 2007, Laier & Jensen 2007, Rollet et al 2009, Sun et al 2012, Green et al 2015, Ramírez-Pérez et al 2017.…”

Section: Sedimentos Gasíferos Del Estuario De Bahía Blancaunclassified

“…De esta forma, y teniendo en cuenta su amplia distribución global, se sugiere que la presencia de gas en la superficie del fondo marino debe tenerse en cuenta como un factor modelador de hábitat a la hora de realizar estudios de ecología bentónica. Norte del Mar de Barents Fleischer et al (2001) Mar de Barents Fleischer et al (2001) Centro de la plataforma continental de Noruega Skagerrak, Dinamarca Kattegat, Dinamarca Bahía Eckernförde, Alemania Sur del Mar Báltico Cuenca Gdansk, Mar Báltico Archipiélago Estocolmo, Suecia Plataforma continental de Reino Golfo de Cádiz, España NO Mar Mediterráneo, España Centro del Mar Adriático Norte del Mar Adriático, costa de Italia Delta del Río Po, Italia Golfo de Amvrakikos, Grecia NO Mar Egeo, Grecia Oeste del Mar Negro, Bulgaria SE del Mar Negro Oeste de la costa de India Centro-Este de la plataforma continental de India Delta de Mekong, Vietnam Hong Kong, China Fleischer et al (2001) Este del Mar de China Plataforma Puerto Wellington, Nueva Zelanda Río de La Plata, Argentina Parker y Paterlini (1990) Estuario de Bahía Blanca, Argentina Aliotta et al (2002) Golfo de San Matías, Argentina Aliotta et al (2000) Canal Beagle, Argentina Bujalesky et al (2004) Puerto Bahía Durban, Sudáfrica Weschenfelder et al (2016) Lago Santa Lucía, Sudáfrica Weschenfelder et al (2016) Plataforma de la costa de Namibia Emeis et al (2004) Bahía Maputo, Mozambique Green et al (2015) Norte del Mar de Arafura, Australia Rollet et al (2009) Río Quantang, China Chun-Ming Lin et al (2010)…”

Section: Conclusionesunclassified

Distribution, vertical position and ecological implications of shallow gas in Bahía Blanca estuary (Argentina)

Bravo

Aliotta

Fiori

et al. 2018

Estuarine, Coastal and Shelf Science

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The aim of this thesis is to characterize the shallow gas deposits of the inner area of the Bahía Blanca estuary and to evaluate the effect of the gas-bearing sediments on the associated subtidal benthic communities. For this purpose, the distribution of shallow gas in the estuary was mapped through the analysis of highresolution seismic records. Based on this map, two study sites were selected (with gas and control) that only differed in the presence of gas in contact with the surface of the seabed. Acoustic methods were used to determine the stratigraphy and morphology of the site with gas and the adjacent area. In addition, the gas sediments were evaluated by means of the following analyses: grain size, organic matter content, X-rays and HPLC head space measurement. The benthic organisms of both sites were compared in terms of abundance, biomass, diversity, evenness, species richness, taxonomic and functional structure. The gas was found widely distributed in the estuary, both near and in contact with the surface of the seabed of the inner area of the Bahía Blanca estuary. It was evidenced in the form of acoustic turbidity and acoustic blanking. The seismo-stratigraphic column presented five seismic sequences of the late Pleistocene-Holocene. It was established that the gas origin is biogenic, being associated with a Middle Holocene deposit, from which it migrated until it was in contact with the surface of the seabed due to the permeability of the overlying strata. The gas in the surface of the seabed was evidenced in sonograms by means of the attenuation of the acoustic signal, which evidences a low cohesion Índice Dedicatoria…………………………………………………………………………………………………….I

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Seismic architecture, stratigraphy and evolution of a subtropical marine embayment: Maputo Bay, Mozambique

Cited by 28 publications

References 32 publications

Sandy barrier overstepping and preservation linked to rapid sea level rise and geological setting

Sandy barrier overstepping and preservation linked to rapid sea level rise and geological setting

Sea-level change in southern Africa since the Last Glacial Maximum

Distribution, vertical position and ecological implications of shallow gas in Bahía Blanca estuary (Argentina)

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