Timing of Tertiary Submarine Canyons and Marine Cycles of Deposition in Southern Sacramento Valley, California: ABSTRACT

Almgren, Alvin A.

doi:10.1306/83d92442-16c7-11d7-8645000102c1865d

Cited by 11 publications

(21 citation statements)

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“…Sediment bodies that have the same geometry and aspect ratio as the channel itself are likely to form only during abandonment of the channel, and often consist of deposits (such as mud plugs due to abandonment or choking by mass transport deposits, or over-spill from an adjacent channel) that do not relate to the activity of the channel as a significant downslope conduit (Almgren, 1978;Elliott, 2000a;Galloway et al, 1991). Where it is possible to determine that a sediment body is the result of continuous migration or aggradation of a single channel we refer to it as a channel fill.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Genesis and character of thin-bedded turbidites associated with submarine channels

Hansen

Callow

Kane

et al. 2015

Marine and Petroleum Geology

117

129

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Submarine channel related thin-bedded turbidites are deposited in environments such as external levees, internal levees, depositional terraces and at times of channel abandonment.Thin-bedded turbidites are defined as beds that are less than 10cm thick, but the described environments can at times contain beds up to 50cm thick which would be classified as medium or thick-bedded (Boggs, 2006). This paper addresses many examples of these environments from the modern seafloor, outcrop and the subsurface to suggest criteria that assist in the differentiation of levees and terraces from an architectural, sedimentological, M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 2 ichnological and hydrocarbon reservoir perspective. External levees confine channel belts and are elongate sedimentary deposits that are a product of over-spill of turbidity currents from the channel belt they confine. External levees often have predictable vertical, lateral and downstream changes but can commonly be modified by collapse of the inner external levee into the channel, collapse on the outer external levee, sediment waves, and interaction of external levees with topographic features such as other channels, other external levees, basin margins or previous slump/slide blocks, which can greatly modify the sand distribution within them.A combination of internal levees, depositional terraces and slide blocks of external levee sediment make up thin-bedded turbidites within channel belts. We differentiate between wedge shaped internal levees and topographically flat or subdued depositional terraces whose differing geometries and sand distribution reflect the fact that the flow processes involved in the formation of these deposits are different. The characteristic wedge shape of an internal levee requires sufficient space within the channel belt for the over-spilling current to decelerate and deposit the majority of its suspended sediment before reaching the bounding topography of the channel belt. In the case of depositional terraces the space available in the channel belt is insufficient for the current to deposit the majority of its sediment before reaching the bounding topography of the channel belt, creating confined sheet-like deposits.External levees, internal levees and depositional terraces have distinct sedimentological characteristics such as sand bed thickness trends and sedimentary structures that can be used to distinguish them. Together with sedimentological characteristics, in some systems these thin-bedded turbidite deposits contain distinctive trace fossil assemblages, where channel proximal deposits such as proximal external levees, internal levees and depositional terraces M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 3 can have much higher biodiversity than sand-rich channel axes and more mud-dominated outer external levees.The depositional sites for internal levees and depositional terraces within channel belts can be formed by various processes such as entrenchment, point bar accretion, meander bend cutoff, ...

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Section: A N U S C R I P Tmentioning

confidence: 99%

Genesis and character of thin-bedded turbidites associated with submarine channels

Hansen

Callow

Kane

et al. 2015

Marine and Petroleum Geology

117

129

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“…In Paleogene time, the Great Valley forearc was predominantly a shelved basin, cut by several large submarine canyons (Almgren, 1978; on November 22, 2010 gsabulletin.gsapubs.org Downloaded from Graham and Berry, 1979). Subsequent deposition within the Sacramento basin was nonmarine, whereas the San Joaquin basin continued as a marine basin (Dickinson, 1995).…”

Section: Introductionmentioning

confidence: 99%

Subduction complex uplift and exhumation and its influence on Maastrichtian forearc stratigraphy in the Great Valley Basin, northern San Joaquin Valley, California

Mitchell¹,

Graham²,

Suek³

2010

Geological Society of America Bulletin

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New 3D seismic-refl ection data from the northern San Joaquin Valley (Great Valley forearc basin), California, provide the fi rst convincing evidence of emergence and erosion of the Franciscan subduction complex during the Mesozoic. Syntectonic growth strata record an early Maastrichtian phase of deformation, which elevated the subduction complex above sea level. Once exposed, erosion generated a supply of sediment that built a progradational wedge (arcward) into bathyal waters of the forearc basin. The thickness and extent of these subduction complex-derived sediments argue for an areally extensive landmass located west of the forearc basin. Regional emergence of the subduction complex suggests that erosion served as a signifi cant driver in the exhumation of Franciscan blueschists.

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“…In the Sacramento Basin, the Martinez Formation ranges in age from above the base of planktonic foraminiferal zone P4 to the lower part of zone P5 (about 58 to 56 Ma) (Almgren, 1984). The San Carlos sand in the San Joaquin Basin is essentially coeval with the more northerly Martinez Formation; in the Vallecitos area (V, fig.…”

Section: [End Moreno Formation]mentioning

confidence: 99%

Age, distribution, and stratigraphic relationship of rock units in the San Joaquin Basin Province, California: Chapter 5 in <i>Petroleum systems and geologic assessment of oil and gas in the San Joaquin Basin Province, California</i>

Scheirer¹,

Magoon²

2008

Professional Paper

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Timing of Tertiary Submarine Canyons and Marine Cycles of Deposition in Southern Sacramento Valley, California: ABSTRACT

Cited by 11 publications

References 0 publications

Genesis and character of thin-bedded turbidites associated with submarine channels

Genesis and character of thin-bedded turbidites associated with submarine channels

Subduction complex uplift and exhumation and its influence on Maastrichtian forearc stratigraphy in the Great Valley Basin, northern San Joaquin Valley, California

Age, distribution, and stratigraphic relationship of rock units in the San Joaquin Basin Province, California: Chapter 5 in <i>Petroleum systems and geologic assessment of oil and gas in the San Joaquin Basin Province, California</i>

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