Paleoceanographic significance of deep-sea benthic foraminiferal species diversity at southeastern Indian Ocean Hole 752A during the Neogene

Singh, Raj K.; Gupta, Anil K.; Das, Moumita

doi:10.1016/j.palaeo.2012.08.008

Cited by 35 publications

(21 citation statements)

References 105 publications

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“…1). It has been well proved that thriving biogenic bloom through the Indian Ocean were bursting 30 during the Latest Miocene-Early Pliocene by ODP sediment sequences (Arumugm et al, 2014;Gupta et al, 2004;Rai and Singh, 2001;Singh et al, 2012). The bloom lead to significantly higher carbonate mass accumulation rates than present day Biogeosciences Discuss., https://doi.org /10.5194/bg-2018-46 Manuscript under review for journal Biogeosciences Discussion started: 15 February 2018 c Author(s) 2018.…”

Section: Geological Settingmentioning

confidence: 99%

“…The presence of Globigerina bulloides indicates that the 5 lithification history of carbonate rocks are less than 5 Ma (Pliocene-Recent) old. Therefore, carbonate deposit on the SWIR should be the bioclastic deposition from the productivity related events 'biogenic bloom' to large part of Indian Ocean during middle Miocene to the early Pliocene (Singh et al, 2012;Rai and Singh, 2001;Gupta et al, 2004;Arumugm et al, 2014).…”

Section: Mineralogymentioning

confidence: 99%

“…Carbonate mass accumulation during the Latest Miocene-Early Pliocene at Indo-Pacific provided the bioclastic deposition to the sea floor (Singh et al, 2012;Rai and Singh, 2001;Gupta et al, 2004;Arumugm et al, 2014). These carbonate sediments deposit on the seafloor 15 thus form a favorable environment for benthic fauna (fig 2).…”

Section: Endolithic Boring In Carbonate Rock On Swirmentioning

confidence: 99%

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Endolithic Boring Enhance the Deep-sea Carbonate Lithification on the Southwest Indian Ridge

Peng

Chen

et al. 2018

Preprint

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Abstract. Deep-sea carbonates represent an important type of sedimentary rock due to their effect on the composition of upper oceanic crust and their contribution to deep-sea geochemical cycles. However, the lithification of deep-sea carbonates at the seafloor has remained a mystery for many years. A large lithified carbonate area, characterized by thriving benthic faunas and tremendous amount of endolithic borings, was discovered in 2008, blanketed on the seafloor of ultraslow 10 spreading Southwest Indian Ridge (SWIR). Macrofaunal inhabitants including echinoids, polychaetes, gastropods as well as crustaceans, are abundant in the sample. The most readily apparent feature of the sample is the localized enhancement of density around the borings. The boring features of these carbonate rocks and factors that may enhance deep-sea carbonate lithification are reported. We suggest that active boring may trigger the dissolution of the original calcite and thus accelerate deep-sea carbonate lithification on mid-ocean ridges. Our study reports an unfamiliar phenomenon of non-burial carbonate 15 lithification and interested by the observation that it is often associated with boring feature. These carbonate rocks may provide a novel mechanism for deep-sea carbonate lithification at the deep-sea seafloor and also illuminate the geological and biological importance of deep-sea carbonate rocks on mid-ocean ridges.

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Section: Geological Settingmentioning

confidence: 99%

Section: Mineralogymentioning

confidence: 99%

Section: Endolithic Boring In Carbonate Rock On Swirmentioning

confidence: 99%

See 1 more Smart Citation

Endolithic Boring Enhance the Deep-sea Carbonate Lithification on the Southwest Indian Ridge

Peng

Chen

et al. 2018

Preprint

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“…Carbonate rocks and various types of sediments have been discovered on mid-ocean ridges through dredging or drilling (Thompson et al, 1968;De et al, 1985;Cooke et al, 2004). These carbonates, which are important elements of the upper oceanic crust, cover approximately half of the area of the en-tire ocean floor.…”

Section: Introductionmentioning

confidence: 99%

“…The local dissolution and reprecipitation of biogenic calcite or aragonite from foraminifera, nanofossils and pteropod oozes may serve to transform the original sediments to chalk or limestone (Schlanger and Douglas, 1974). These processes, however, cannot completely explain the observation that (i) the degree of burial is commonly inconsistent with the known burial depth and paleontological age (Schmoker and Halley, 1982) and (ii) lithified carbonate rocks found on the seafloor commonly show no evidence of burial (Thompson et al, 1968). The lithification of deep-sea carbonates has also been associated with the breakdown of oceanic basalts or prolonged exposure to the chemical gradients at the sedimentwater interface (Pimm et al, 1971;Bernoulli et al, 1978).…”

Section: Introductionmentioning

confidence: 99%

Macrofaunal burrowing enhances deep-sea carbonate lithification on the Southwest Indian Ridge

Peng

Chen

et al. 2018

Biogeosciences

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Abstract. Deep-sea carbonates represent an important type of sedimentary rock due to their effect on the composition of the upper oceanic crust and their contribution to deep-sea geochemical cycles. However, the role of deep-sea macrofauna in carbonate lithification remains poorly understood. A large lithified carbonate area, characterized by thriving benthic faunas and a tremendous amount of burrows, was discovered in 2008, blanketing the seafloor of the ultraslowly spreading Southwest Indian Ridge (SWIR). Benthic inhabitants – including echinoids, polychaetes, gastropods and crustaceans – are abundant in this carbonate lithified area. The burrowing features within these carbonate rocks, as well as the factors that may influence deep-sea carbonate lithification, were examined. We suggest that burrowing in these carbonate rocks enhances deep-sea carbonate lithification. We propose that active bioturbation may trigger the dissolution of the original calcite and thus accelerate deep-sea carbonate lithification on mid-ocean ridges. Macrofaunal burrowing provides a novel driving force for deep-sea carbonate lithification at the seafloor, illuminating the geological and biological importance of bioturbation in global deep-sea carbonate rocks.

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Sedimentary and foraminiferal records of Late Quaternary environmental change west of Ireland and implications for the last British–Irish Ice Sheet

Peters

Benetti

Dunlop

et al. 2020

J Quaternary Science

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Palaeoenvironmental change following deglaciation of the last British–Irish Ice Sheet on the continental shelf west of Ireland was investigated using multiproxy analyses of sediment and foraminifera data from nine sediment cores. Lithofacies associations record various depositional regimes across the shelf, which evolve from subglacial to postglacial conditions. Census data provide the first characterisation of benthic foraminifera populations across the continental shelf and multivariate analyses reveal three distinct biotopes. Biomineralization within these biotopes is restricted to ≤21 200 cal a bp by four radiocarbon ages. The transition from glacial to postglacial benthic foraminifera populations near the shelf break marks the establishment of productive, nutrient‐rich, ice‐distal conditions at ~20 900 cal a bp; these conditions may also mark the start of favourable conditions for postglacial cold‐water coral growth. Postglacial conditions on the inner shelf were not established until <14 500 cal a bp, suggesting glacial conditions west of Ireland may have persisted into the Bølling–Allerød Interstadial.

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Paleoceanographic significance of deep-sea benthic foraminiferal species diversity at southeastern Indian Ocean Hole 752A during the Neogene

Cited by 35 publications

References 105 publications

Endolithic Boring Enhance the Deep-sea Carbonate Lithification on the Southwest Indian Ridge

Endolithic Boring Enhance the Deep-sea Carbonate Lithification on the Southwest Indian Ridge

Macrofaunal burrowing enhances deep-sea carbonate lithification on the Southwest Indian Ridge

Sedimentary and foraminiferal records of Late Quaternary environmental change west of Ireland and implications for the last British–Irish Ice Sheet

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