Investigations of the spatial and temporal variations of <scp>S</scp>r and <scp>N</scp>d isotopes in sediments from two <scp>I</scp>ndian <scp>R</scp>ivers: Implications to source identification

Pradhan, Sonali; Zhang, Jing; Baskaran, Mark; Shirodkar, P.V.; Wu, Ying; Pradhan, U.K.

doi:10.1002/2016gc006669

Cited by 6 publications

(4 citation statements)

References 46 publications

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“…In contrast, detrital sediments delivered by numerous minor rivers from the gneissic rock in southern India are least radiogenic in Nd with wider variations in Sr (Goswami et al, 2012; Figures 1 and 4). The eolian dust, which forms a minority component of detrital sediments in the eastern Arabian Sea, shows similar isotopic signatures to those of the Deccan Trap basalts (Goswami et al, 2012; Pradhan et al, 2017; Figures 1 and 4). However, previous studies based on the clay mineralogy of the sediments in the western Arabian Sea have reported that eolian dust is dominated by palygorskite, which is nearly absent in the investigated interval of Site U1456 (Debrabant et al, 1991; Pandey et al, 2016).…”

Section: Discussionmentioning

confidence: 61%

“…For comparison, the Sr‐Nd isotopic data of eolian dust (Goswami et al, 2012; Kessarkar et al, 2003), sediments from the Indus River (Clift et al, 2010; Li et al, 2018), Deccan Trap basalts (Goswami et al, 2012; Kessarkar et al, 2003; Peng et al, 1998), Narmada River and Tapti River (Goswami et al, 2012), and Nethravathi River and Periyar River from gneissic rocks (Goswami et al, 2012) are plotted. The black hyperbola indicates two end‐member mixing between the IMP Indus River and Deccan Traps (Goswami et al, 2012; Pradhan et al, 2017). The average composition of the Sr‐Nd isotopes of the Narmada and Tapti Rivers is used to represent the Deccan Trap end member.…”

Section: Discussionmentioning

confidence: 99%

“…To quantify the contributions of the siliciclastic sediments from each source, a two end‐member mixing model of Sr‐Nd isotopes was used. The mixing proportions of the Indus River ( F Indus ) were calculated according to the following equation developed by Faure (1986):

F_{Indus} = \frac{X_{D} ((), R_{D}^{X} - R_{M}^{X})}{X_{I} ((), R_{M}^{X} - R_{I}^{X}) + X_{D} ((), R_{D}^{X} - R_{M}^{X})},

where X I and X D represent the concentrations of X (Sr or Nd) in the Indus and Deccan end members, respectively (Sr I = 137.4 ppm, Sr D = 165.5 ppm, Nd I = 31.0 ppm, Nd D = 19.5 ppm) (Clift et al, 2010; Lightfoot et al, 1990; Pradhan et al, 2017). R I X and R D X represent the isotopic ratios of X (Sr or Nd) in the Indus and Deccan end members, respectively ( R I Nd = 0.511974, R D Nd = 0.512222, R I Sr = 0.7264, R D Sr = 0.71271) (Clift et al, 2010; Goswami et al, 2012; Li et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

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Geochemical Records of the Provenance and Silicate Weathering/Erosion From the Eastern Arabian Sea and Their Responses to the Indian Summer Monsoon Since the Mid‐Pleistocene

Chen

Lim

et al. 2020

Paleoceanog and Paleoclimatol

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We present a multiproxy record of Sr-Nd isotopes and major and trace elements for clay-sized (<2 μm) siliciclastic sediment fractions from the International Ocean Discovery Program Site U1456 in the eastern Arabian Sea to extract reliable chemical indicators not influenced by the grain-size effect, quantitatively estimate detrital provenance, and constrain silicate weathering/erosion in response to the Indian summer monsoon over orbital timescales. A provenance analysis of fine-grained siliciclastic sediments indicates a two end-member mixture from the Indus River (20-90%) and rivers draining the Deccan Traps (10-80%). A prominent increase in terrigenous input from the Indus River occurred at 0.5 Ma, probably resulting from an intensive erosional event in the Himalayan region. Moreover, α Al K at Site U1456, which is calculated as Al/K ratio of the study sample versus Al/K ratio of the upper continental crust, can be generally used to reflect the chemical weathering intensity in the source regions. During most interglacial and even certain glacial periods, the Indian summer monsoon reinforcement is closely coupled with enhanced continental chemical weathering and physical erosion. Wavelet and spectral analyses of the α Al K record display strong 125-, 35-, 29-, and 23-kyr periodicities since 1.2 Ma with significant 100-kyr cycles established at the end of the Mid-Pleistocene Transition (~0.7 Ma), suggesting forcing mechanisms linked with both Northern and Southern Hemispheric processes. Significant fluctuations observed in silicate weathering/erosion during~1.2-0.7 Ma indicate an enhancement of the Indian summer monsoon with increased variability in association with the Mid-Pleistocene Transition.

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Section: Discussionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 99%

F_{Indus} = \frac{X_{D} ((), R_{D}^{X} - R_{M}^{X})}{X_{I} ((), R_{M}^{X} - R_{I}^{X}) + X_{D} ((), R_{D}^{X} - R_{M}^{X})},

Section: Discussionmentioning

confidence: 99%

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Geochemical Records of the Provenance and Silicate Weathering/Erosion From the Eastern Arabian Sea and Their Responses to the Indian Summer Monsoon Since the Mid‐Pleistocene

Chen

Lim

et al. 2020

Paleoceanog and Paleoclimatol

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“…The India Ocean receives the largest amount of sediments through erosion of the surrounding continents compared to that of the Atlantic and the Pacific Oceans (Gaillardet et al, 1999;Milliman et al, 1984). In the north Indian Ocean, sediments are mainly supplied by rivers draining through the Himalayas, Western Ghats, and the peninsular India followed by lesser but significant amount of aeolian dust from Arabia, Oman, Africa, and Western Indian deserts (Goswami et al, 2012;Kessarkar et al, 2003;Krishnaswami et al, 1992;Pradhan et al, 2017;Ramaswamy & Nair, 1994;Sirocko & Sarnthein, 1989). In the southeast Indian Ocean, the surface detrital sediments showed petrographic characteristics of the surrounding continental bedrocks of Australia and Indonesia (Ehlert et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Trace Elements and Sr, Nd Isotope Compositions of Surface Sediments in the Indian Ocean: An Evaluation of Sources and Processes for Sediment Transport and Dispersal

Anand

Rahaman

Lathika

et al. 2019

Geochem Geophys Geosyst

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To decipher sediment provenance, understand dispersal pattern and its controlling factors in the Indian Ocean, we have studied major and trace element abundances and isotope compositions of Sr (87Sr/86Sr) and Nd (εNd) in silicate fractions of 38 surface sediment samples collected at ~1.5° interval from India (~10°N) to Antarctica (~70°S). The 87Sr/86Sr ratio and εNd vary from 0.70527 and 0.1 near Crozet Island to 0.77854 and −34.8 near Antarctica, respectively. Higher 87Sr/86Sr ratio and lower εNd near Antarctica indicate source of old granitic rocks, and the opposite is observed in sediments from the Central and the Southwest Indian Ridges indicating source of seafloor spreading and mid‐ocean ridge hydrothermal activity. Chondrite normalized Rare Earth Elements (REEs) pattern reveals positive Europium anomaly for Central and Southwest Indian Ridge sediments, while positive Gadolinium anomaly is observed in Indian and Antarctic coastal sediments. Sediments in the Indian sector of Southern Ocean and coastal Antarctica are highly dispersed through deep, bottom, and Antarctic circumpolar currents. The εNd spatial map generated for the entire Indian Ocean based on compilation of present study and results from literature shows dominance of terrigenous inputs from continental erosion with minor contribution from the ridges in the Indian Ocean. The εNd map together with trace elements can be employed for reconnaissance for mineral exploration associated with hydrothermal deposits. Further, comparison of detrital εNd with its counter phases, that is, authigenic fractions and modern seawater at the sampling sites, would enhance our knowledge of benthic exchange processes, with an implication in using Nd isotopes as a water mass circulation proxy.

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Origin and composition of dissolved and particulate matter in mountain rivers of the Nepal Himalayas: Insights from Sr and Nd isotopes and elemental ratios

Bhandari,

Huang,

Dario

et al. 2024

Applied Geochemistry

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Investigations of the spatial and temporal variations of Sr and Nd isotopes in sediments from two Indian Rivers: Implications to source identification

Cited by 6 publications

References 46 publications

Geochemical Records of the Provenance and Silicate Weathering/Erosion From the Eastern Arabian Sea and Their Responses to the Indian Summer Monsoon Since the Mid‐Pleistocene

Geochemical Records of the Provenance and Silicate Weathering/Erosion From the Eastern Arabian Sea and Their Responses to the Indian Summer Monsoon Since the Mid‐Pleistocene

Trace Elements and Sr, Nd Isotope Compositions of Surface Sediments in the Indian Ocean: An Evaluation of Sources and Processes for Sediment Transport and Dispersal

Origin and composition of dissolved and particulate matter in mountain rivers of the Nepal Himalayas: Insights from Sr and Nd isotopes and elemental ratios

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