Titanium in some Carboniferous sediments from Great Britain

Spears, D. A.; Kanaris‐Sotiriou, R.

doi:10.1016/0016-7037(76)90212-x

Cited by 85 publications

(21 citation statements)

References 18 publications

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“…The finer-grained component of the lithogenous sediment fraction in the abyssal sediment is composed largely of the clay minerals and feldspar (Mü ller and Stoffers, 1974), which have lower densities than the Ti-and Zr-bearing minerals and, thus are transported under lower energy conditions. This difference in the physical properties of the two groups of minerals allows the Si, Ti, and Zr contents to serve as proxies of sediment grain-size (Spears and Kanaris-Sotiriou, 1976;Shimmield and Mowbray, 1991;Calvert and Pedersen, 2007). Their enrichment/depletion in sedimentary deposits is commonly interpreted to reflect mechanical sorting and winnowing of the lower density fraction.…”

Section: Unit 1 (Calcareous Sapropel)mentioning

confidence: 98%

Holocene and late glacial palaeoceanography and palaeolimnology of the Black Sea: Changing sediment provenance and basin hydrography over the past 20,000years

Piper

Calvert

2011

Geochimica et Cosmochimica Acta

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Section: Unit 1 (Calcareous Sapropel)mentioning

confidence: 98%

Holocene and late glacial palaeoceanography and palaeolimnology of the Black Sea: Changing sediment provenance and basin hydrography over the past 20,000years

Piper

Calvert

2011

Geochimica et Cosmochimica Acta

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“…Relative changes in the abundance of Ti and Zr have also been used previously as grain size proxies owing to the expected enrichment of these elements in silt to sand sized sediment relative to their abundance in clay minerals (notwithstanding the presence of clay-bound Ti, for example) (Calvert and Pedersen, 2007). The relatively high density of minerals rich in these elements, such as zirconium (ZrSiO 4 ), rutile (TiO 2 ) and ilmenite (FeTiO 3 ), means that these elements are commonly transported with silt and sand-sized quartz in the detrital fraction, leading to a grain-size association (Spears and Kanaris-Sotiriou, 1976;Chen et al, 2006;Calvert and Pedersen, 2007). In contrast, K is most strongly associated with aluminosilicates such as clay minerals (e.g.…”

Section: Detrital Proxiesmentioning

confidence: 98%

Multiproxy geochemical analysis of a Panthalassic margin record of the early Toarcian oceanic anoxic event (Toyora area, Japan)

Kemp

Izumi

2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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a b s t r a c tThe early Toarcian oceanic anoxic event (OAE) was a significant palaeoenvironmental perturbation that led to marked changes in ocean chemistry and climate, and which also had a long-lasting impact on marine ecosystems. The global significance of the event has been recognised from the widespread occurrence of a~3-7‰ negative excursion in the carbon-isotope (δ 13 C) composition of marine organic and inorganic matter and terrestrial plant material. This feature of the event is indicative of a pronounced perturbation to the global carbon cycle; an inference further supported by widespread evidence for seawater deoxygenation and elevated rates of organic carbon burial. Nevertheless, the precise palaeoenvironmental impacts of this event from sections outside of the Boreal and Tethyan realms are uncertain. Here, we present the results of a multiproxy geochemical study of an expanded record of the early Toarcian event from the northwest Panthalassa Ocean margin exposed in southwest Japan (Toyora area, Yamaguchi prefecture). Our results indicate that in the studied succession, organic matter enrichment persisted through the early Toarcian event, but elemental redox proxies do not support persistent seawater anoxia. Analyses of terrigenously derived major and trace element abundances coupled with sedimentological observations reveal an increase in coarse-grained sediment close to the onset of a~−4‰ excursion in δ 13 C org , and coincident with an inferred increase in terrestrial organic matter flux. These observations are consistent with previously published evidence for a marked strengthening of hydrological cycling and increased runoff that occurred contemporaneously with abrupt warming at the onset of the carbon isotope event.

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“…To evaluate more fully the signal contained in the Ti and Cr ratios, we must assess their geochemical pathway. Ti is known to be preferentially concentrated in coarser sediment fractions (Spears and Kanaris-Sotiriou, 1976;Schmitz, 1987) due to its incorporation into heavy minerals such as ilmenite, rutile, tita- nomagnetite, and augite. Cr is an important minor element constituent of the ultrabasic rocks making up the serpentinites of the Oman ophiolite on the Arabian Peninsula and nearby Masirah Island (Moseley and Abbotts, 1979).…”

Section: Aluminosilicate Detritus Factormentioning

confidence: 99%

The Inorganic Geochemical Record of the Northwest Arabian Sea: A History of Productivity Variation over the Last 400 k.y. from Sites 722 and 724

Shimmield¹,

Mowbray²

1991

Proceedings of the Ocean Drilling Program

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High-resolution sampling from late Pleistocene (last 400 k.y.) sediments of Site 722 (upper 16 m) and Site 724 (upper 70 m), and subsequent inorganic geochemical analysis, has defined the history of productivity in the northwest Arabian Sea. Eolian dust input from the Arabian Peninsula and Somalia is characterized by the record of Ti/Al and Cr/Al. This dust record displays strong precessional periodicity (cycles at 25 k.y.) suggesting the Southwest Monsoon and associated winds play a key role in transporting terrigenous material from the land. High biological productivity results in the accumulation of biogenic CaCO 3 and opal in the sediments, the latter having an unexpectedly minor contribution to the total mass flux. Due to dilution of the CaCO 3 record by the terrigenous component, the record of biological productivity is best exemplified by Ba. Its record, together with that of other metals recording biological association and redox variability (Cu, Ni, Zn, V, U) clearly identifies the interglacial episodes as being more biologically productive. The striking agreement between Ba and the δ 18 θ record in planktonic foraminifers suggests that the supply of nutrients during these periods of high productivity is linked to ocean-wide changes in ocean fertility, and not just local upwelling conditions. High levels of phosphate accumulation in interglacial sediments is attributed to both diagenetic phosphorite formation and biogenic skeletal debris. This study provides a detailed record of productivity variation in the northwest Arabian Sea during the late Pleistocene.

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Titanium in some Carboniferous sediments from Great Britain

Cited by 85 publications

References 18 publications

Holocene and late glacial palaeoceanography and palaeolimnology of the Black Sea: Changing sediment provenance and basin hydrography over the past 20,000years

Holocene and late glacial palaeoceanography and palaeolimnology of the Black Sea: Changing sediment provenance and basin hydrography over the past 20,000years

Multiproxy geochemical analysis of a Panthalassic margin record of the early Toarcian oceanic anoxic event (Toyora area, Japan)

The Inorganic Geochemical Record of the Northwest Arabian Sea: A History of Productivity Variation over the Last 400 k.y. from Sites 722 and 724

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