Data report: 87Sr/86Sr in pore fluids from IODP Expedition 355 Arabian Sea Monsoon

Carter, Samantha C.; Griffith, Elizabeth M.; Scher, Howie D.

doi:10.14379/iodp.proc.355.201.2017

Cited by 5 publications

(4 citation statements)

References 29 publications

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“…If weathering and laterization processes were driving changes in clay K/Al and clay Sr isotopes, a negative relationship between records is expected; more intense chemical weathering would lower K/Al and increase 87 Sr/ 86 Sr due to the increased mobilization of Sr in silicate rocks, which typically have more radiogenic 87 Sr/ 86 Sr values (Derry & France-Lanord, 1996;Quade et al 2003). Our long-term record indicates only a weak positive relationship (the opposite of what is expected if weathering is the control), which does not support chemical weathering as being a primary control on clay 87 Sr/ 86 Sr. To investigate the role of diagenesis, clay 87 Sr/ 86 Sr was compared with porewater 87 Sr/ 86 Sr (Carter et al 2017), which shows there is no significant influence by diagenetic processes within the sedimentary column on the clay 87 Sr/ 86 Sr (online Supplementary Material SM1, Section S9). However, the dissolution of siliciclastic sediment within the methane generation zone does appear to increase the porewater 87 Sr/ 86 Sr values in Unit II with values as high as 0.71032, significantly above those of contemporaneous seawater.…”

Section: B Provenance or Weathering Signals?mentioning

confidence: 99%

Clay-fraction strontium and neodymium isotopes in the Indus Fan: implications for sediment transport and provenance

et al. 2020

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Reconstructing the provenance of siliciclastic marine sediment is important for understanding sediment pathways and constraining palaeoclimate and erosion records. However, physical fractionation of different size fractions can occur during sediment transport, potentially biasing records derived from bulk sediment. In this study, records of radiogenic Sr and Nd isotopic composition and K/Al ratio of the separated clay fraction, as well as bulk grain size, are presented, measured from deep-sea sediments recovered from International Ocean Discovery Program (IODP) Sites U1456 and U1457 in the Arabian Sea. These new records are compared with published bulk sediment records to investigate the influence of sediment transport on these proxies and to constrain provenance evolution and its relationship to climate variability since middle Miocene time. Correlations between grain size and the bulk sediment isotopic composition confirm that transport processes are influencing the bulk sediment record. This relationship, although present, is not as strong in the clay-fraction isotopic records. Heterogeneity of bulk sediment likely drives differences between bulk and clay records, thought to be largely controlled by sediment transport processes. The isotopic records reveal variations in provenance that correlate with climatic change at 8–7 Ma, as well as an increase in overall provenance variability beginning at c. 3.5 Ma, likely linked to monsoon strength and glacial–interglacial cycles. The clay-fraction records highlight the potential value of measuring proxy records from multiple size fractions to help constrain provenance records as well as investigate sediment transport and/or weathering and erosion processes recorded in deep-sea sediment archives.

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Section: B Provenance or Weathering Signals?mentioning

confidence: 99%

Clay-fraction strontium and neodymium isotopes in the Indus Fan: implications for sediment transport and provenance

et al. 2020

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“…The mineralogy was dominated by high-coercivity magnetic minerals (haematite; S-ratio < 0.9) and lower bacterial magnetite activity (χ ARM /χlf and χ ARM /SIRM values below the threshold value; Dearing, 1999;. Further, the interstitial water chemistry suggested that the sulphate reduction zone was located up to 54 meters below sea floor (mbsf) of Site U1457 sediments (Pandey et al 2016;Carter et al 2017). These findings confirm that the magnetic mineral signatures are largely controlled by the change in magnetic mineral provenance rather than reductive diagenesis for the study period at Site U1457.…”

Section: B Suitability Of Magnetic Mineral Proxy Signatures For Palae...mentioning

confidence: 99%

Hydroclimatic conditions and sediment provenance in the northeastern Arabian Sea since the late Miocene: insights from geochemical and environmental magnetic records at IODP Site U1457 of the Laxmi Basin

et al. 2023

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Palaeo-monsoon and palaeoclimate conditions over Southeast Asia are a matter of debate despite notable studies on the continental and oceanic sedimentary record. The present study investigates the environmental magnetic and geochemical records preserved in the deep marine sediments of the northeastern (NE) Arabian Sea to elucidate the erosion history of the western Himalayas and its link with the prevailing hydroclimatic conditions since the late Miocene. For this, the sediment core retrieved during International Ocean Discovery Program (IODP) Expedition 355 at Site U1457 in the NE Arabian Sea has been explored. The results reveal that the hydroclimatic conditions were predominantly arid during the late Miocene, except for humid intervals from 6.1 Ma to 5.6 Ma. Humid climate conditions in the Indus River Basin returned during the mid-Pliocene and continued to the Pleistocene with an intense chemical weathering regime from 1.9 Ma to 1.2 Ma. The dominant sediment source to the NE Arabian Sea at Site U1457 during the late Miocene and the Pliocene was the Indus River, while during the Pleistocene, mixed sediments brought by the Indus River and the Peninsular Indian rivers were observed. The sediment contribution from a chemically less altered mafic source (the Deccan basalts) increased between 1.2 Ma and 0.2 Ma, possibly linked to a weak Indian Summer Monsoon. The summer monsoon wind strength and associated shift in the Inter-Tropical Convergence Zone (ITCZ) influenced the dominant sediment provenance at Site U1457 of the Laxmi Basin.

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“…From left to right, summary of the lithostratigraphy and profiles of sedimentation rate, porosity, sodium and chloride concentrations, Sodium to chloride and bromide to chloride concentration ratios, Strontium isotope ratio, calcium and magnesium concentrations. All the data are from Pandey et al (2016b and c) except the Strontium data which are from Carter et al (2017). Horizontal dashed lines delimit the lithostratigraphic units (I, II, III & IV).…”

Section: Figurementioning

confidence: 99%

“…Chemical data are taken from Pandey et al (2016b, & c). 87 Sr/ 86 Sr ratios are taken from Carter et al (2017). All these data from published literature are shown in Figure 1.…”

Section: Iii) Chemical Chracteristics Of the Pore Fluids From Sites U...mentioning

confidence: 99%

Chloride exchanges between oceanic sediments and seawater: Constraints from chlorine isotopes

Agrinier,

Gieskes,

Subbarao

et al. 2023

Geochimica et Cosmochimica Acta

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Data report: 87Sr/86Sr in pore fluids from IODP Expedition 355 Arabian Sea Monsoon

Abstract: Introduction 2 Analytical methods 3 Results and discussion 5 Conclusion 5 Acknowledgments 6 References

Cited by 5 publications

References 29 publications

Clay-fraction strontium and neodymium isotopes in the Indus Fan: implications for sediment transport and provenance

Clay-fraction strontium and neodymium isotopes in the Indus Fan: implications for sediment transport and provenance

Hydroclimatic conditions and sediment provenance in the northeastern Arabian Sea since the late Miocene: insights from geochemical and environmental magnetic records at IODP Site U1457 of the Laxmi Basin

Chloride exchanges between oceanic sediments and seawater: Constraints from chlorine isotopes

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