The limited suitability of silica diagenetic boundaries as isothermal markers: Insights from seismic reflection imaging, Offshore Sakhalin, Russian Far East

Meadows, David; Davies, Richard J.

doi:10.1016/j.marpetgeo.2009.12.006

Cited by 7 publications

(11 citation statements)

References 21 publications

(67 reference statements)

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“…3 and 7). This has also been noted by Meadows and Davies (2010) for the silica diagenesis front from the Sea of Okhotsk. Where the boundary is concordant to the local stratigraphy, the lack of sufficient biogenic silica above the front is one possible explanation of the concordant geometry, but this can be excluded here because of the high degree of local discordance (e.g.…”

Section: Controls On the Reaction Front Geometrysupporting

confidence: 73%

“…Hein et al, 1978;Hammond and Gaither, 1983;Lonsdale, 1990;Bohrmann et al, 1992;Kuramoto, 1992;Nobes et al, 1992;Brekke, 2000;Davies and Cartwright, 2002;Volpi et al, 2003;Berndt et al, 2004;Nouzé et al, 2009;Meadows and Davies, 2010). Most of these studies have characterised the A/CT reflection as being generally parallel to the present day seafloor, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Fossilisation of a silica diagenesis reaction front on the mid-Norwegian margin

Neagu

Cartwright

Davies

et al. 2010

Marine and Petroleum Geology

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Section: Controls On the Reaction Front Geometrysupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Fossilisation of a silica diagenesis reaction front on the mid-Norwegian margin

Neagu

Cartwright

Davies

et al. 2010

Marine and Petroleum Geology

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“…This is at the lower bound (~20 °C) of temperatures derived from wells associated with clear geophysical expressions of Opal A-CT transitions elsewhere, most of which exceed 35–40 °C 28,31,32 . Opal A-CT transitions at significantly greater depths, with temperature greatly exceeding this value have also been reported in some instances, where the vertical (upward) migration of the diagenetic front has been arrested, or fossilized, for reasons that remain poorly understood 31,33 . However, empirical observations of shallower and lower temperature (~16–20 °C) transitions are rare 28 , and are only found in association with large-scale slide scars representing widespread seabed erosion…”

Section: Introductionmentioning

confidence: 84%

Erosion and deposition beneath the Subantarctic Front since the Early Oligocene

Nicholson

Stow

2019

Sci Rep

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The Antarctic Circumpolar Current (ACC) spills across the Falkland Plateau into the South Atlantic as a series of high-velocity jets. These currents are a driving force for global overturning circulation, and affect climate by modulating CO 2 exchange between the atmosphere and ocean, but their timing of onset remains controversial. We present new evidence of strong currents associated with the Subantarctic Front (SAF) jet since the earliest Oligocene (~34 Ma) based on a widespread erosional surface on the Falkland Plateau, preserved below a 30,000 km 2 contourite sand deposit. This is the largest such feature ever to be recognized, and provides the most robust constraint of the initiation of the SAF to date. By contrast, the South Falkland Slope Drift is dominated by contourite mud of Pleistocene-Recent age, substantially younger than previous estimates, indicating a significant decrease in long-term current strength at that time. As ACC strength is primarily a function of the position of the South-Westerly Winds, our data indicates that associated currents are likely to increase substantially in a warming world. Likely implications include increased upwelling and associated carbon flux from the deep ocean to the atmosphere, a positive feedback loop not included in most future projections of atmospheric CO 2 .

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“…Silica transformation across the TZ A/CT is accompanied by a noticeable decrease in porosity, permeability, and water content and an increase in density and P-wave velocity values (e.g. Guerin and Goldberg, 2002;Hesse, 1988;Isaacs, 1981;Meadows and Davies, 2010;Nobes et al, 1992). Therefore, the TZ A/CT appears as a BSR of positive polarity that cross-cuts the host strata, known as an Opal-A to Opal-CT BSR (O A/CT _BSR) (Bohrmann et al, 1992;Hein et al, 1978).…”

Section: Introductionmentioning

confidence: 99%