Biological productivity, terrigenous influence and noncrustal elements supply to the Central Indian Ocean Basin: Paleoceanography during the past ∼ 1 Ma

Pattan, J.N.; Masuzawa, Toshiyuki; Borole, D.V.; Parthiban, G.; Jauhari, Pratima; Yamamoto, M.

doi:10.1007/bf02702009

Cited by 30 publications

(20 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is of the expected behaviour since the REE contents of most shale's and solid phases are normally enriched in LREEs relative to HREEs (Haskin et al 1966) even though the absolute concentration in most sediments are similar. The surface sediments have REE concentration close to the shale values and a sample to shale ratio very close to 1 normally indicates a dominant terrigenous source (Piper 1974a;Pattan et al 2005). The increase of REE concentration indicated an additional supply of REE to the sediment in addition to the detritus source.…”

Section: Ree Distribution and Sourcementioning

confidence: 84%

“…A depletion of Ce relative to its neighbouring REEs gives rise to a negative Ce-anomaly. This could be resulted from the presence of siliceous organisms and Bementite (Piper 1974a(Piper , 1974bTlig and Steinberg 1982;Pattan et al 2005). A positive Ceanomaly occurs, when Ce is enriched relative to its neighbours and might have resulted from the presence of Fe-Mn oxyhydroxides (Piper 1974b;Pattan et al 2005).…”

Section: Ce-anomaly As a Redox Indicatormentioning

confidence: 99%

“…A number of parameters such as Mn, total organic carbon, U/Th, authegenic U, Cu/Zn, V/Cr, S compared to organic carbon and all stable isotopes are widely used to understand the depositional environments (Kuspert 1982;MacLeod and Irving 1996;Pattan et al 2005). Some of the above parameters are used in the present study to understand the depositional behaviour.…”

Section: Geochemical Parameters Indicative Of Oxygenation Conditionmentioning

confidence: 99%

See 2 more Smart Citations

Behaviour of REEs in a tropical estuary and adjacent continental shelf of southwest coast of India: Evidence from anomalies

2012

View full text Add to dashboard Cite

The distribution and accumulation of the rare earth elements (REE) in the sediments of the Cochin Estuary and adjacent continental shelf were investigated. The rare earth elements like La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and the heavy metals like Mg, V, Cr, Mn, Fe, Cu, Zn, U, Th were analysed by using standard analytical methods. The Post-Archean Australian Shale composition was used to normalise the rare earth elements. It was found that the sediments were more enriched with the lighter rare earth elements than the heavier ones. The positive correlation between the concentrations of REE, Fe and Mn could explain the precipitation of oxyhydroxides in the study area. The factor analysis and correlation analysis suggest common sources of origin for the REEs. From the Ce-anomalies calculated, it was found that an oxic environment predominates in all stations except the station No. 2. The Eu-anomaly gave an idea that the origin of REEs may be from the feldspar. The parameters like total organic carbon, U/Th ratio, authigenic U, Cu/Zn, V/Cr ratios revealed the oxic environment and thus the depositional behaviour of REEs in the region.

show abstract

Section: Ree Distribution and Sourcementioning

confidence: 84%

Section: Ce-anomaly As a Redox Indicatormentioning

confidence: 99%

Section: Geochemical Parameters Indicative Of Oxygenation Conditionmentioning

confidence: 99%

See 1 more Smart Citation

Behaviour of REEs in a tropical estuary and adjacent continental shelf of southwest coast of India: Evidence from anomalies

2012

View full text Add to dashboard Cite

show abstract

“…Ash layers in these sediment cores are based on the relative abundance of glass shard contents in their coarse fractions rather than actual shard counts. The chemical composition of the first ash layer in the entire CIOB correlates well with that of YTT (Pattan et al 1999(Pattan et al , 2003. Electron microprobe data of microtektites and glass shards from the second ash layers and a comparison with other locations are presented in tables 1 and 2.…”

Section: Resultsmentioning

confidence: 85%

Correlation of the oldest Toba Tuff to sediments in the central Indian Ocean Basin

2010

Self Cite

View full text Add to dashboard Cite

We have identified an ash layer in association with Australasian microtektites of ∼ 0.77 Ma old in two sediment cores which are ∼ 450 km apart in the central Indian Ocean Basin (CIOB). Morphology and chemical composition of glass shards and associated microtektites have been used to trace their provenance. In ODP site 758 from Ninetyeast Ridge, ash layer-D (13 cm thick, 0.73-0.75 Ma) and layer-E (5 cm thick, 0.77-0.78 Ma) were previously correlated to the oldest Toba Tuff (OTT) eruptions of the Toba caldera, Sumatra. In this investigation, we found tephra ∼ 3100 km to the southwest of Toba caldera that is chemically identical to layer D of ODP site 758 and ash in the South China Sea correlated to the OTT. Layer E is not present in the CIOB or other ocean basins. The occurrence of tephra correlating to layer D suggests a widespread distribution of OTT tephra (∼ 3.6 × 10 7 km 2 ), an ash volume of at least ∼ 1800 km 3 , a total OTT volume of 2300 km 3 , and classification of the OTT eruption as a super-eruption.

show abstract

“…Similarly, organic carbon values seem to be the lowest in Central Indian Ocean in comparison with other known deep-sea areas. The low organic content in the CIOB (0.07 to 0.41% in the present study) is attributed to low sediment accumulation rates (Pattan et al 2005) that allow more remineralization at the sediment water interface. However, comparisons between different deep-sea macrobenthic studies poses a problem due to the varying sieve sizes used ( Glover et al (2002) in the Pacific Ocean with a sieve size of 0.3 mm, the polychaete density, which is the dominant macrofauna group, ranged between 9 and 84 ind·0.25m −2 .…”

Section: Faunal Composition and Abundancementioning

confidence: 72%

Composition of macrobenthos from the Central Indian Ocean Basin

et al. 2009

View full text Add to dashboard Cite

The deep sea is well known for its high faunal diversity. But the current interest in its abundant polymetallic nodules, poses a threat to the little known benthic organisms surviving in this unique environment. The present study is the first attempt to document the Indian Ocean abyssal benthic diversity of macroinvertebrates and to investigate its relation to the surface primary production (chl-a), sediment labile organic matter, organic carbon and texture. The present study is based on 87 individuals. Altogether 39 macroinvertebrate genera were obtained from water depths of 4500-5500 m from 23 box cores. Reduction in macrobenthic density was seen towards the southern latitudes. The area was dominated by deposit feeding macrobenthos. Vertically, the fauna was distributed down to 30 cm depth, with the highest faunal density in the top 2-5 cm sediment section. The values for population density were strongly correlated with surface water chl-a and sediment protein, indicating supply of fresh organic matter as a critical factor for maintaining the deep sea benthic diversity and abundance.

show abstract

Biological productivity, terrigenous influence and noncrustal elements supply to the Central Indian Ocean Basin: Paleoceanography during the past ∼ 1 Ma

Abstract: A 2 m-long sediment core from the siliceous ooze domain in the Central Indian Ocean Basin (CIOB; 13 • 03 S: 74 • 44 E; water depth 5099 m) is studied for calcium carbonate, total organic carbon, total nitrogen, biogenic opal, major and few trace elements (Al,

Cited by 30 publications

References 39 publications

Behaviour of REEs in a tropical estuary and adjacent continental shelf of southwest coast of India: Evidence from anomalies

Behaviour of REEs in a tropical estuary and adjacent continental shelf of southwest coast of India: Evidence from anomalies

Correlation of the oldest Toba Tuff to sediments in the central Indian Ocean Basin

Composition of macrobenthos from the Central Indian Ocean Basin

Contact Info

Product

Resources

About