The Influence of Valley Morphology On the Rate of Bayhead Delta Progradation

2014 ◽  
Vol 85 (1) ◽  
pp. 38-44 ◽  
Author(s):  
A. R. Simms ◽  
A. B. Rodriguez
Keyword(s):  
Delta Progradation ◽  
Bayhead Delta

Nonglaciogenic deltaic deposits in the early Proterozoic Gowganda Formation, Cobalt Basin, Ontario

1988 ◽  
Vol 25 (5) ◽  
pp. 710-724 ◽  
Author(s):  
R. H. Rainbird ◽  
J. A. Donaldson
Keyword(s):  
Fluvial System ◽  
Early Proterozoic ◽  
Lacustrine Basin ◽  
Delta Progradation ◽  
Delta Slope

The Gowganda Formation in the eastern part of the Cobalt Basin comprises the Coleman Member and the conformably overlying Firstbrook Member. The Firstbrook Member differs from the Coleman Member in that its lithofacies display (i) marked lateral continuity, (ii) abundant diagenetic red colouration, (iii) evidence of tidal deposition, and (iv) a lack of glaciogenic features. The Firstbrook Member is here divided into a mud-dominated lower facies, a silt-dominated middle facies, and sand-dominated upper facies. These are respectively equated with the prodelta, delta slope, and delta foreslope subenvironments of a prograding river-dominated deltaic wedge composed of coalescing deltas (probably braid deltas). The deltaic wedge was likely fed by a fluvial system analogous to the braidplain system that prevailed during deposition of the overlying Lorrain Formation. Uninterrupted delta progradation is suggested by a single coarsening-upward sequence up to 535 m thick. Deposition probably occurred within a marine rather than lacustrine basin.

scholarly journals Cryostratigraphy, sedimentology, and the late Quaternary evolution of the Zackenberg River delta, northeast Greenland

2017 ◽  
Vol 11 (3) ◽  
pp. 1265-1282 ◽  
Author(s):  
Graham L. Gilbert ◽  
Stefanie Cable ◽  
Christine Thiel ◽  
Hanne H. Christiansen ◽  
Bo Elberling
Keyword(s):  
Late Quaternary ◽  
Sediment Cores ◽  
River Delta ◽  
Optically Stimulated Luminescence ◽  
Delta Plain ◽  
Valley Fill ◽  
Subaerial Exposure ◽  
Facies Associations ◽  
Delta Progradation ◽  
Ice Content

Abstract. The Zackenberg River delta is located in northeast Greenland (74°30′ N, 20°30′ E) at the outlet of the Zackenberg fjord valley. The fjord-valley fill consists of a series of terraced deltaic deposits (ca. 2 km2) formed during relative sea-level (RSL) fall. We investigated the deposits using sedimentological and cryostratigraphic techniques together with optically stimulated luminescence (OSL) dating. We identify four facies associations in sections (4 to 22 m in height) exposed along the modern Zackenberg River and coast. Facies associations relate to (I) overriding glaciers, (II) retreating glaciers and quiescent glaciomarine conditions, (III) delta progradation in a fjord valley, and (IV) fluvial activity and niveo-aeolian processes. Pore, layered, and suspended cryofacies are identified in two 20 m deep ice-bonded sediment cores. The cryofacies distribution, together with low overall ground-ice content, indicates that permafrost is predominately epigenetic in these deposits. Fourteen OSL ages constrain the deposition of the cored deposits to between approximately 13 and 11 ka, immediately following deglaciation. The timing of permafrost aggradation was closely related to delta progradation and began following the subaerial exposure of the delta plain (ca. 11 ka). Our results reveal information concerning the interplay between deglaciation, RSL change, sedimentation, permafrost aggradation, and the timing of these events. These findings have implications for the timing and mode of permafrost aggradation in other fjord valleys in northeast Greenland.

scholarly journals Holocene palaeoceanographic evolution of the Iskenderun bay, South-Eastern Turkey, as a response to river mouth diversions and human impact

2000 ◽  
Vol 1 (1) ◽  
pp. 19 ◽  
Author(s):  
S. SPEZZAFERRI ◽  
D. BASSO ◽  
H. KORAL
Keyword(s):  
Large Scale ◽  
River Mouth ◽  
Environmental Evolution ◽  
Forest Clearing ◽  
Low Salinity ◽  
The Core ◽  
Cladocora Caespitosa ◽  
Eastern Turkey ◽  
Iskenderun Bay ◽  
Delta Progradation

A quantitative study of benthic foraminifera, sediment texture and composition from two cores was performed to unravel the environmental evolution of the Iskenderun Bay (eastern Turkey) in the Holocene. Core 29 (NE Iskenderun Bay) consists of clay and silt from the top of the core down to 35 cm with dominant bioclasts (coral Cladocora caespitosa) from 35 cm down to the bottom of the core. Core 92, located near an ancient Ceyhan River mouth (Yumurtalik), consists of sandy and silty sediment passing to homogeneous clay and silt at about 48 cm from the top. Several grab samples show very coarse biogenic detritus covered by a centimetric veneer of sandy silt and clay. Radiocarbon dating of corals, molluscs and algae from core 29 and five selected grab samples, the sediment and foraminiferal study indicate that at least three pulses of muddy sedimentation occurred in the bay. (1) An older pulse (about 3700 yrs BP) related to the large-scale forest clearing (Beysheir Occupation Phase). (2) Another pulse coincides with a major delta progradation of the Ceyhan River at about 2140 years BP. (3) A younger pulse follows the diversion of the Ceyhan River mouth toward Yumurtalik, from the Middle Age to 1935.Species interpreted as tolerant of low salinity indicate that the influence of the Ceyhan was minor when the river drained directly into the Mediterranean Sea (approximately 2000 years BP) and progressively increased when the river diverted towards Yumurtalik.

Recognition and significance of bayhead delta deposits in the rock record: A comparison of modern and ancient systems

Sedimentology ◽  
2017 ◽  
Vol 65 (1) ◽  
pp. 62-95 ◽  
Author(s):  
Jennifer L. Aschoff ◽  
Cornel Olariu ◽  
Ronald J. Steel
Keyword(s):  
Rock Record ◽  
Bayhead Delta

Holocene delta progradation into an epeiric sea in northeastern Australia

2020 ◽  
Vol 422 ◽  
pp. 106114
Author(s):  
Erin L. Porritt ◽  
Brian G. Jones ◽  
David M. Price ◽  
Rafael C. Carvalho
Keyword(s):  
Epeiric Sea ◽  
Delta Progradation

The Ardèche endokarstic responses to the eustatic variations resulting from the Messinian salinity crisis

2006 ◽  
Vol 177 (1) ◽  
pp. 27-36 ◽  
Author(s):  
Ludovic Mocochain ◽  
Georges Clauzon ◽  
Jean-Yves Bigot
Keyword(s):  
Sea Level Rise ◽  
Mediterranean Sea ◽  
Sea Level ◽  
Carbonate Platform ◽  
Messinian Salinity Crisis ◽  
Base Level ◽  
Accommodation Space ◽  
Fan Delta ◽  
Delta Progradation ◽  
The Mediterranean

Abstract The Messinian salinity crisis is typically recorded by evaporites in the abyssal plains of the Mediterranean Sea and by canyons incised into the Mediterranean margins and their hinterlands. However, the impacts of crisis on geomorphology and surface dynamics lasted, until canyons were filled by sediments in the Pliocene (fig. 2). In the mid-Rhône valley, the Ardeche Cretaceous carbonate platform is incised over 600 m by the Rhône Messinian canyon. The canyon thalweg is located – 236 m bsl (below sea level) in the borehole of Pierrelatte [Demarcq, 1960; fig. 1]. During the Pliocene, this canyon was flooded as a ria and infilled by a Gilbert type fan delta [Clauzon and Rubino, 1992; Clauzon et al., 1995]. The whole Messinian-Pliocene third order cycle [Haq et al., 1987] generated four benchmark levels. The first two are [Clauzon, 1996]: (i) The pre-evaporitic abandonment surface which is mapped around the belvedere of Saint-Restitut (fig. 1). This surface is synchronous [Clauzon, 1996] of the crisis onset (5.95 Ma) [Gautier et al., 1994; Krigjsman et al., 1999] and, consequently, is an isochronous benchmark. (ii) The Messinian erosional surface is also an isochronous benchmark due to the fast flooding [Blanc, 2002] of the Rhône canyon, becoming a ria at 5.32 Ma [Hilgen and Langereis, 1988]. These surfaces are the result of endoreic Mediterranean sea level fall more than a thousand meters below the Atlantic Ocean. A huge accommodation space (up to more than 1000 m) was created as sea-level rose up to 80 m above its present-day level (asl) during the Pliocene highstand of cycle TB 3.4 (from 5.32 to 3.8 Ma). During the Lower Pliocene this accommodation space was filled by a Gilbert fan delta. This history yields two other benchmark levels: (i) the marine/non marine Pliocene transition which is an heterochronous surface produced by the Gilbert delta progradation. This surface recorded the Pliocene highstand sea level; (ii) the Pliocene abandonment surface at the top of the Gilbert delta continental wedge. Close to the Rhône-Ardeche confluence, the present day elevations of the four reference levels are (evolution of base-level synthesized in fig. 4): (1) 312 m asl, (2) 236 m bsl, (3) 130 m asl, (4) 190 m asl. The Ardèche carbonate platform underwent karstification both surficial and at depth. The endokarst is characterized by numerous cavities organised in networks. Saint-Marcel Cave is one of those networks providing the most complete record (fig. 5). It opens out on the northern side of the Ardeche canyon at an altitude of 100 m. It is made up by three superposed levels extending over 45 km in length. The lower level (1) is flooded and functionnal. It extends beneath the Ardeche thalweg down to the depth of 10 m bsl reached by divers. The observations collected in the galleries lead us to the conclusion that the karst originated in the vadose area [Brunet, 2000]. The coeval base-level was necessarily below those galleries. The two other levels (middle (2) and upper (3)) are today abandoned and perched. The middle level is about 115 m asl and the upper one is about 185 m asl. They are horizontal and have morphologies specific to the phreatic and temporary phreatic zone of the karst (fig. 6). In literature, the terracing of the Saint-Marcel Cave had been systematically interpreted as the result of the lowering by steps of the Ardeche base-level [Guérin, 1973; Blanc, 1995; Gombert, 1988; Debard, 1997]. In this interpretation, each deepening phase of the base level induces the genesis of the gravitary shaft and the abandonment of the previous horizontal level. The next stillstand of base level leads to the elaboration of a new horizontal level (fig. 7). This explanation is valid for most of Quaternary karsts, that are related to glacioeustatic falls of sea-level. However our study on the Saint-Marcel Cave contests this interpretation because all the shafts show an upward digging dynamism and no hint of vadose sections. The same “per ascensum” hydrodynamism was prevailing during the development of the whole network (figs. 8 and 9). We interpret the development of the Ardeche endokarst as related to the eustatic Messinian-Pliocene cycle TB 3.4/3.5 recorded by the Rhône river. The diving investigations in the flooded part of the Saint-Marcel Cave and also in the vauclusian springs of Bourg-Saint-Andeol reached - 154 m bsl. Those depths are compatible only with the incision of the Messinian Rhône canyon at the same altitude (−236 m bsl). The Saint-Marcel lower level would have develop at that time. The ascending shaping of levels 2 and 3 is thus likely to have formed during the ensuing sea-level rise and highstand during the Pliocene, in mainly two steps: (i) the ria stage controlled by the Mediterranean sea level rise and stillstand; (ii) the rhodanian Gilbert delta progradation, that controlled the genesis of the upper level (fig. 10).

The upper Hawkesbury River, New South Wales, Australia: a Holocene example of an estuarine bayhead delta

Sedimentology ◽  
1997 ◽  
Vol 44 (2) ◽  
pp. 263-286 ◽  
Author(s):  
SCOTT L. NICHOL ◽  
BRIAN A. ZAITLIN ◽  
BRUCE G. THOM
Keyword(s):  
New South ◽  
New South Wales ◽  
South Wales ◽  
Bayhead Delta

scholarly journals Supplemental Material: Autogenic delta progradation during sea-level rise within incised valleys

2020 ◽  
Author(s):  
Laure Guerit ◽  
et al.
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Incised Valleys ◽  
Delta Progradation

Three supplemental figures, one table, and supplemental text.<br>

Sign in / Sign up

Export Citation Format

Share Document