Buried nodules and associated sediments from the central Indian basin

Banerjee, R.; Iyer, Sridhar D.; Dutta, Pushan Kumar

doi:10.1007/bf02431037

Cited by 22 publications

(6 citation statements)

References 21 publications

(11 reference statements)

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“…During their accretion from seawater, they concentrate various trace elements within the Fe–Mn oxide layers (Reyss et al, ). Even though several studies have described the geochemical and mineralogical characters of ferromanganese deposits from the Indian Ocean (Banerjee, ; Banerjee, ; Banerjee & Iyer, ; Banerjee, Iyer, & Dutta, ; Banerjee & Miura, , ; Banerjee & Mukhopadhyay, ; Banerjee & Mukhopadhyay, ; Banerjee, Roy, Dasgupta, Mukhopadhyay, & Miura, ; Bau & Koschinsky, ; Jauhari & Pattan, ; Pattan et al, ; Roy, Dasgupta, Mukhopadhyay, & Fukuoka, ; Tooms, Summerhayes, & Cronan, ; Vineesh, Nath, Banerjee, Jaisankar, & Lekshmi, ), the isotopic data on these deposits are still scanty. O'Nions, Frank, von Blanckenburg, and Ling () described the secular variation of Nd and Pb isotopes in ferromanganese crusts from the Central Indian Basin and compared them with those from the Atlantic and Pacific.…”

Section: Introductionmentioning

confidence: 99%

Geochemical, mineralogical, and Sr–Nd isotopic compositions of ferromanganese encrustations from Central Indian Ridge at 06°38.5′S

et al. 2017

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Mineralogical, geochemical, and isotopic (Sr and Nd) studies of 14 ferromanganese encrustations on basaltic substrates from Central Indian Ridge at 06°38.5′S indicate that except for two (NC3 and NC4), the samples are hydrogenous type. NC3 and NC4 have slightly higher growth rates, lower bulk trace metal contents, and low ∑REE. They have a lower content of high field strength (e.g., Hf, Ta, Zr, and Nb), incompatible (e.g., Pb, Th, and U), and lithophilic elements (e.g., Sr and Ba) than others. In addition, NC3 has a lower 87Sr/86Sr ratio (0.708825) than the remaining samples (range 0.709169–0.709253) but higher 143Nd/144Nd ratio (0.512296) than others (range 0.512258–0.512279). Both NC3 and NC4 have a higher radiogenic component indicated by their low εNd value (−6.67) than the remaining samples (range −7.00 to −7.41). These evidences together indicate a possible contribution of trace metals by a local mixed source of hydrothermal and hydrogenous origin during their growth history.

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Section: Introductionmentioning

confidence: 99%

Geochemical, mineralogical, and Sr–Nd isotopic compositions of ferromanganese encrustations from Central Indian Ridge at 06°38.5′S

et al. 2017

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“…Gupta (1988) identi® ed radiolarian zonation and volcanic ash layers in two sediment cores from the CIOB. The buried nodules and associated sediments were studied for Mn, Fe, Ni, Cu, Co, and organic carbon content in a short, 20 cm long, core by Banerjee, Iyer, and Dutta (1991). Banakar, Gupta, and Padmavati (1991) studied three spade cores for Mn, Fe, Co, Ni, and Cu and sediment accumulation rate.…”

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confidence: 99%

Major, Trace, and Rare Earth Elements in the Sediments of the Central Indian Ocean Basin: Their Source and Distribution

Pattan¹,

Jauhari²

2001

Marine Georesources and Geotechnology

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A large number of surface sediments as well as short sediment cores collected in the Central Indian Ocean Basin have been subjected to various geochemical investigations during the last one and half decade. The studies varied, covering diVerent aspects of sediments and resulting in a number of publications. In the present article, we have put together the data from 82 surface sediments and 14 short sediment cores, including 25 new analyses, to study the trend of their distribution and source at large. The distribution maps of elements show that highest concentrations of Mn, Cu, Ni, Zn, Co, and biogenic opal in the surface sediment occurs between 10¯S and 16¯S latitude, where diagenetic ferromanganese nodules rich in Mn, Cu, Ni, and Zn are present. The studies highlight that the excess element concentration (detrital unsupported) such as Mn, Cu, Ba, Ni, Co, Pb, and Zn have contributed . 80% of their respective bulk composition. These excess elements exhibit strong positive correlation with each other suggesting their association with a single authigenic phase such as Mn oxide. Biogenic opal contributes 30± 50% of the total silica in the siliceous sediment. Aluminum, Fe, and K have contributed . 60% from terrigenous detrital source compared to their bulk composition. In calcareous ooze, Ca, and Sr excess contribute . 95% while, in siliceous ooze it is only 50% of their bulk composition. Nearly 35% of structurally unsupported Al in the sediment raises doubt of using Al as a terrigenous index element to normalize the trace and minor elements. Biogenic apatite is evident by the positive correlation between Ca ( , 1% ) and P. Calcium, Sr, and P depict a common source such as biogenic. Bulk element concentration such as Li, V, Cr, Sc, and Zr are positively correlated with Ti indicating their terrigenous detrital source. Rare earth element (REE) concentration increases from calcareous ooze to siliceous ooze and reaches a maximum in the red clay. Presence of positive Eu-anomal y in these sediments has been attributed to aeolian input. REE in these sediments are mostly carried by authigenic phases such as manganese oxide and biogenic apatite. Based on the distribution of transition elements in the sediment cores, three distinct zonesÐ oxic at top, suboxic at intermediate depth, and a subsurface maximaÐ have been identiWed. Oxic and suboxic zones are incidentally associated with high and low micronodule abundance in the coarse fraction ( . 63 m m) respectively. Ash layers encountered at intermediate depth between 10 to 35 cm are correlative with the Youngest Toba eruption of ¹74 ka 85 from Northern Sumatra. This ash is mainly responsible for the high bulk Al/Ti ratio up to 48.5 (three times higher than Post Archean Australian Shale), other than scavenging of dissolved Al by biogenic components.

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“…Thus, the elevated Al/Ti ratio observed in the calcareous sediments could be due to the excess Al derived from the hydrothermal emanations from the nearby mid‐oceanic ridge (Thi Dieu Vu & Sohrin, ). Again, early diagenetic enrichment due to dissolution of biogenic component can also cause enrichment of Fe and Mn in these sediments (Banerjee, ; Banerjee, Iyer, & Dutta, ; Wang et al, ). However, early diagenetic enrichment or terrestrial input cannot account for 10–25 times enrichment of Mn (with respect to PAAS value) in the surface sediments of the CIB.…”

Section: Discussionmentioning

confidence: 99%

Depositional environment of the surface sediments in Central Indian Basin (CIB), Indian Ocean, between 8°–18°S latitude and 72°–79°E longitude, based on their geochemical characteristics

et al. 2017

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To establish the depositional environment of the surface sediments in the Central Indian Basin, Indian Ocean, major and trace element compositions of different sediment types were studied. The study area composed of terrigenous–siliceous transition, calcareous, siliceous, and red clay sediments. The sediment type changed due to various physico‐chemical conditions with varying proportions of biogenic, hydrogenetic, early diagenetic, and detrital inputs. An oxidative environment is present throughout the basin with variable intensity. The terrigenous input was variable in all sediment types, while its signature was traceable up to 15.30°S latitude. The variable distribution pattern of Mnexcess and Feexcess indicate that apart from continental source, there were additional sources of supply for both these elements, with which most of the trace metals like nickel, copper, chromium, vanadium, yttrium, rubidium, and thorium were associated. The Al/Ti ratios of the sediments indicate a terrestrial influence of fluvial nature up to as far as 14°S latitude while, in the calcareous zone, the influence of volcanic precursors was observed. The present study envisages that Alexcess in the sediments adjacent to the ridges and fracture zones might indicate that Al in these areas is not entirely derived from the continental source.

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Buried nodules and associated sediments from the central Indian basin

Cited by 22 publications

References 21 publications

Geochemical, mineralogical, and Sr–Nd isotopic compositions of ferromanganese encrustations from Central Indian Ridge at 06°38.5′S

Geochemical, mineralogical, and Sr–Nd isotopic compositions of ferromanganese encrustations from Central Indian Ridge at 06°38.5′S

Major, Trace, and Rare Earth Elements in the Sediments of the Central Indian Ocean Basin: Their Source and Distribution

Depositional environment of the surface sediments in Central Indian Basin (CIB), Indian Ocean, between 8°–18°S latitude and 72°–79°E longitude, based on their geochemical characteristics

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