Geochemical characteristics of deep-sea sediments from the Arabian Sea: a high-resolution study

Schnetger, Bernhard; Brumsack, Hans‐Jürgen; Schale, Holger; Hinrichs, Joachim; Dittert, L

doi:10.1016/s0967-0645(00)00047-3

Cited by 133 publications

(68 citation statements)

References 56 publications

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“…Higher Mn values are typical of the oxidising front in sediment (Thomson et al 1995, Schnetger et al 2000, Maynard 2005, Roy 2006, Tribovillard et al 2006, Rodríguez-Tovar & Reolid 2013.…”

Section: Methodsmentioning

confidence: 99%

“…which are common components of relatively coarsergrained (mainly silt-sized) siliciclastic fractions and their enrichment is therefore generally interpreted as coarser siliciclastic presence in fine-grained sediments (Fralick & Kronberg 1997, Schnetger et al 2000. Zr/Al was chosen as grain-size proxy in this study.…”

Section: Methodsmentioning

confidence: 99%

“…They are therefore sensitive to redox conditions and/or palaeoproductivity rates. Copper is particularly immobile under reducing conditions (Shaw et al 1990, Schnetger et al 2000, Laurent et al 2006. We used Cu, Ni, Zn and Pb sums as a proxy for redox and palaeoproductivity changes in this study; the association of these elements is revealed by their close relationship in principal component analysis (PCA).…”

Section: Methodsmentioning

confidence: 99%

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Petrophysical and geochemical signature of the Hangenberg Events: an integrated stratigraphy of the Devonian-Carboniferous boundary interval in the Northern Rhenish Massif (Avalonia, Germany)

Kumpan¹,

Bábek²,

Kalvoda³

et al. 2015

Bull. Geosci.

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“…Higher Mn values are typical of the oxidising front in sediment (Thomson et al 1995, Schnetger et al 2000, Maynard 2005, Roy 2006, Tribovillard et al 2006, Rodríguez-Tovar & Reolid 2013.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Petrophysical and geochemical signature of the Hangenberg Events: an integrated stratigraphy of the Devonian-Carboniferous boundary interval in the Northern Rhenish Massif (Avalonia, Germany)

Kumpan¹,

Bábek²,

Kalvoda³

et al. 2015

Bull. Geosci.

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“…Since the organic matter content in sediments is also influenced by other factors (quality of organic matter, early diagenesis, rates of sedimentation and sediment type -see Paropkari et al, 1992), it may not serve as an independent proxy for productivity. Schnetger et al (2000) showed that the total organic carbon is not a tracer, but Ba/Al serves as a proxy for paleoproductivity in the sediments of deep Arabian Sea. Sediment trap experiments showed that Ca, Sr and Ba associate with biogenic particles and, particulate organic matter is an effective scavenger for metals such as Cu, Ni, Zn and V, whose concentrations are controlled by seasonally driven changes in primary productivity (Jickells et al, 1984;Shimmield and Mowbray, 1991;Schnetger et al, 2000).…”

Section: Productivity and Redox Conditions 421 Glacial Sedimentsmentioning

confidence: 99%

“…Schnetger et al (2000) showed that the total organic carbon is not a tracer, but Ba/Al serves as a proxy for paleoproductivity in the sediments of deep Arabian Sea. Sediment trap experiments showed that Ca, Sr and Ba associate with biogenic particles and, particulate organic matter is an effective scavenger for metals such as Cu, Ni, Zn and V, whose concentrations are controlled by seasonally driven changes in primary productivity (Jickells et al, 1984;Shimmield and Mowbray, 1991;Schnetger et al, 2000). Ba in the offshore precipitates as barite by the living phytoplankton cells and thus barite content in sediments is a function of biological productivity.…”

Section: Productivity and Redox Conditions 421 Glacial Sedimentsmentioning

confidence: 99%

Paleoclimatic and diagenetic history of the late quaternary sediments in a core from the Southeastern Arabian Sea: Geochemical and magnetic signals

et al. 2010

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The geochemical and rock-magnetic investigations were carried out on a sediment core collected from the SE Arabian Sea at 1420 m depth in oxygenated waters below the present day oxygen minimum zone. The top 250 cm sediments of the core represent the last 35 kaBP. The δ 18O values of Globigerinoides ruber are heaviest during the Last Glacial Maximum (LGM) and appear unaffected by low-saline waters transported from the Bay of Bengal by stronger northeast monsoon and West Indian coastal current. The signatures of Bφlling-Allerφd and Younger Dryas events are distinct in the records of magnetic susceptibility, organic carbon (OC) and δ 18O. Glacial sediments show higher OC, CaCO 3 , Ba, Mo, U and Cd, while the early to late Holocene sediments show increasing concentrations of OC, CaCO 3 , Ba, Cu, Ni and Zn and decreasing concentrations of Mo, U and Cd. Productivity induced lowoxygenated bottom waters and reducing sedimentary conditions during glaciation and, productivity and oxygenated bottom waters in Holocene are responsible for their variation. The core exhibits different stages of diagenesis at different sediment intervals. The occurrence of fine-grained, low-coercivity, ferrimagnetic mineral during glacial period is indicative of its formation in organic-rich, anoxic sediments, that may be analogous to the diagenetic magnetic enhancement known in sapropels of the Mediterranean Sea and Japan Sea. The glacial sediments exhibiting reductive diagenesis with anoxic sedimentary environment in this core correspond to reductive diagenesis and intermittent bioturbation (oxygenation) reported in another core in the vicinity. This suggests that the low-oxygenated bottom water conditions during glacial times should not be generalized, but are influenced locally by productivity, sedimentation rates and sediment reworking.

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Solar forcing of Nile discharge and sapropel S1 formation in the early to middle Holocene eastern Mediterranean

et al. 2014

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We present high-resolution records for oxygen isotopes of the planktic foraminifer Globigerinoides ruber (δ 18 O ruber ) and bulk sediment inorganic geochemistry for Holocene-age sediments from the southeast Mediterranean. Our δ 18 O ruber record appears to be dominated by Nile discharge rather than basin-scale salinity/temperature changes. Nile discharge was enhanced in the early to middle Holocene relative to today. The timing of the long-term maximum in Nile discharge during the early Holocene corresponds to the timing of maximum intensity of the Indian Ocean-influenced Southwest Indian summer monsoon (SIM). This coincidence suggests a major influence of an Indian Ocean moisture source on Nile discharge in the early to middle Holocene, while, presently, the Atlantic Ocean is the main moisture source. Nile discharge was highly variable on multicentennial time scale during the early to middle Holocene, being strongly influenced by variable solar activity. This solar-driven variability is also recorded in contemporaneous SIM records, however, not observed in an Atlantic Ocean-derived West African summer monsoon record from the Holocene. This supports the hypothesis that the Indian Ocean moisture source predominantly controlled Nile discharge at that time. Solar-driven variability in Nile discharge also influenced paleoenvironmental conditions in the eastern Mediterranean. Bulk sediment Ba/Al and V/Al, used as indicators for (export) productivity and redox conditions, respectively, varied both in response to solar forcing on multicentennial time scales. We suggest that changes in Nile discharge on these time scales have been concordant with nutrient inputs to, and shallow ventilation of, the eastern Mediterranean.

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Geochemical characteristics of deep-sea sediments from the Arabian Sea: a high-resolution study

Cited by 133 publications

References 56 publications

Petrophysical and geochemical signature of the Hangenberg Events: an integrated stratigraphy of the Devonian-Carboniferous boundary interval in the Northern Rhenish Massif (Avalonia, Germany)

Petrophysical and geochemical signature of the Hangenberg Events: an integrated stratigraphy of the Devonian-Carboniferous boundary interval in the Northern Rhenish Massif (Avalonia, Germany)

Paleoclimatic and diagenetic history of the late quaternary sediments in a core from the Southeastern Arabian Sea: Geochemical and magnetic signals

Solar forcing of Nile discharge and sapropel S1 formation in the early to middle Holocene eastern Mediterranean

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