Do manganese nodules grow or dissolve after burial? Results from the Central Indian Ocean Basin

Pattan, J.N.; Parthiban, G.

doi:10.1016/j.jseaes.2007.03.003

Cited by 29 publications

(4 citation statements)

References 30 publications

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“…Most of Si, Al and K in the nodules are of terrigenous nature and is evident by the reasonably good positive correlation (r = 0.49) between them (Table 2). A combined phase of Ti-ferri-phosphate in the nodules derived from sea water column by hydrogenetic process is evident and is similar to the surface and subsurface nodules from the same basin (Pattan and Banakar, 1993;Jauhari and Pattan, 2000;Pattan and Parthiban, 2007). Nodules from siliceous ooze have highest Mn/Fe ratio, followed by calcareous ooze and are of diagenetic to early diagenetic nature (Jauhari, 1987) while, lone nodule from red clay is of hydrogenetic origin.…”

Section: Geochemistry Of Nodulesmentioning

confidence: 69%

Geochemistry of ferromanganese nodule–sediment pairs from Central Indian Ocean Basin

Pattan

Parthiban

2011

Journal of Asian Earth Sciences

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Section: Geochemistry Of Nodulesmentioning

confidence: 69%

Geochemistry of ferromanganese nodule–sediment pairs from Central Indian Ocean Basin

Pattan

Parthiban

2011

Journal of Asian Earth Sciences

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“…Manganese nodules are frequently encountered both at the sediment‐water interface and within sediments (e.g., Jeong et al., 1996). The reason of the distribution is unclear but is related to long term tectonic activity and sediment sieving (Pattan & Parthiban, 2007).…”

Section: Methodsmentioning

confidence: 99%

Sediment Accumulation and Carbon Burial in Four Hadal Trench Systems

et al. 2022

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Hadal trenches are considered to act as depocenters for organic material, although pathways for the material transport and deposition rates are poorly constrained. Here we assess focusing, deposition and accumulation of material and organic carbon in four hadal trench systems underlying different surface ocean productivities; the eutrophic Atacama and Kuril-Kamchatka trenches, the mesotrophic Kermadec trench and the oligotrophic Mariana Trench. The study is based on the distributions of naturally occurring 210 Pb ex , 137 Cs and total organic carbon from recovered sediment cores and by applying previously quantified benthic mineralization rates. Periods of steady deposition and discreet mass-wasting deposits were identified from the profiles and the latter were associated with historic recorded seismic events in the respective regions. During periods without mass wasting, the estimated focusing factors along trench axes were elevated, suggesting more or less continuous downslope focusing of material toward the interior of the trenches. The estimated organic carbon deposition rates during these periods exhibited extensive site-specific variability, but were generally similar to values encountered at much shallower settings such as continental slopes and margins. Organic carbon deposition rates during periods of steady deposition were not mirrored by surface ocean productivity, but appeared confounded by local bathymetry. The inclusion of deposition mediated by mass-wasting events enhanced the sediment and organic carbon accumulations for the past ∼150 years by up to a factor of ∼4. Thus, due to intensified downslope material focusing and infrequent mass-wasting events, hadal trenches are important sites for deposition and sequestration of organic carbon in the deep sea.Plain Language Summary Hadal trenches (>6,000 m water depth) occupy ∼1% of the world's ocean floor yet are largely underexplored, but recent studies have shown that these environments are depocenters for organic material and microbial activity is intensified when compared to shallower abyssal plains. However, transport and accumulation of sediment material to these hadal trenches is poorly understood. This study investigates sedimentation and accumulation dynamics of organic carbon in trenches using results of radionuclide analysis (in sediment from the Atacama, Kuril-Kamchatka, Kermadec, and Mariana trenches). The analysis shows that trench sediments consist of discreet layers representing both periods of continuous deposition and sudden mass-wasting events often triggered by historic earthquakes. Down slope focusing of material, intensified the deposition along the trench axes. However, the deposition rates exhibited extensive site-specific variations that were partly related to mass-wasting events which greatly enhanced not only mass accumulation but also organic carbon accumulation at the trench axes. Our results illustrate that mass-wasting events play an important role on supplying organic carbon to hadal communities and suggest that hadal tr...

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“…Following which, the digest was dissolved in 4 ml of 1:1 HNO 3 acid and made to 100 ml final volume with Milli-Q water. Elemental concentrations were analyzed by Inductively Coupled Plasma Mass Spectrometer (ICP-MS, X-series2 of Thermo Fisher) at NIO, Goa, with Rh as internal standard 57 . Along with the samples, geochemical reference standards of MAG-1, SCo-1, and AGV-1 were analyzed and the accuracy of trace and REE with reference to these standards was better than ± 3%.…”

Section: Methodsmentioning

confidence: 99%

Increased chemical weathering during the deglacial to mid-Holocene summer monsoon intensification

Miriyala

Sukumaran

Nath

et al. 2017

Sci Rep

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Chemical weathering and the ensuing atmospheric carbon dioxide consumption has long been considered to work on geological time periods until recently when some modelling and natural records have shown that the weathering-related CO2 consumption can change at century to glacial-interglacial time scale. Last glacial to interglacial transition period is a best test case to understand the interplay between Pco2-temperature-chemical weathering when a pulse of rapid chemical weathering was initiated. Here we show, from a high resolution 54 ka record from the Andaman Sea in the northern Indian Ocean, that the chemical weathering responds to deglacial to mid-Holocene summer monsoon intensification in the Myanmar watersheds. The multi-proxy data (Al/K, CIA, Rb/Sr, 87Sr/86Sr for degree of weathering and 143Nd/144Nd for provenance) reveal an increase in silicate weathering with initiation of interglacial warm climate at ~17.7 ka followed by a major change at 15.5 ka. Inferred changes in chemical weathering have varied in tandem with the regional monsoonal proxies (δ18Osw-salinity changes of Northern Indian Ocean, effective Asian moisture content and δ18O records of Chinese caves) and are synchronous with changes in summer insolation at 30°N and δ18O of GISP2 implying that chemical weathering was not a later amplifier but worked in tandem with global climate change.

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Do manganese nodules grow or dissolve after burial? Results from the Central Indian Ocean Basin

Cited by 29 publications

References 30 publications

Geochemistry of ferromanganese nodule–sediment pairs from Central Indian Ocean Basin

Geochemistry of ferromanganese nodule–sediment pairs from Central Indian Ocean Basin

Sediment Accumulation and Carbon Burial in Four Hadal Trench Systems

Increased chemical weathering during the deglacial to mid-Holocene summer monsoon intensification

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