Chapter 1 Precambrian basins of India: stratigraphic and tectonic context

Mazumder, Rajat; Eriksson, P.G.

doi:10.1144/m43.1

Cited by 20 publications

(6 citation statements)

References 25 publications

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“…The elevation of the land surface, derived from the SRTM digital elevation model [54], varies from 1500 metres above sea level (m asl) in the south-east of the catchment to 50 m asl at Patna (Figure 2). Broadly, the areas of higher ground in the south-west of the catchment correlate with harder igneous rocks, for example, the basalt lavas of the Deccan Traps [55], and the lower-lying areas are associated with the thick alluvial floodplain of the River Ganges.…”

Section: Model Applicationmentioning

confidence: 99%

Integration of 2D Lateral Groundwater Flow into the Variable Infiltration Capacity (VIC) Model and Effects on Simulated Fluxes for Different Grid Resolutions and Aquifer Diffusivities

Scheidegger

Jackson

Sekhar

et al. 2021

Water

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Better representations of groundwater processes need to be incorporated into large-scale hydrological models to improve simulations of regional- to global-scale hydrology and climate, as well as understanding of feedbacks between the human and natural systems. We incorporated a 2D groundwater flow model into the variable infiltration capacity (VIC) hydrological model code to address its lack of a lateral groundwater flow component. The water table was coupled with the variably saturated VIC soil column allowing bi-directional exchange of water between the aquifer and the soil. We then investigated how variations in aquifer properties and grid resolution affect modelled evapotranspiration (ET), runoff and groundwater recharge. We simulated nine idealised, homogenous aquifers with different combinations of transmissivity, storage coefficient, and three grid resolutions. The magnitude of cell ET, runoff, and recharge significantly depends on water table depth. In turn, the distribution of water table depths varied significantly as grid resolution increased from 1° to 0.05° for the medium and high transmissivity systems, resulting in changes of model-average fluxes of up to 12.3% of mean rainfall. For the low transmissivity aquifer, increasing the grid resolution has a minimal effect as lateral groundwater flow is low, and the VIC grid cells behave as vertical columns. The inclusion of the 2D groundwater model in VIC will enable the future representation of irrigation from groundwater pumping, and the feedbacks between groundwater use and the hydrological cycle.

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Section: Model Applicationmentioning

confidence: 99%

Integration of 2D Lateral Groundwater Flow into the Variable Infiltration Capacity (VIC) Model and Effects on Simulated Fluxes for Different Grid Resolutions and Aquifer Diffusivities

Scheidegger

Jackson

Sekhar

et al. 2021

Water

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“…The Proterozoic history of Indian Peninsular Shield includes Mesoproterozoic Mobile Belts (MPMB: Radhakrishna and Naqvi 1986) and epicratonic, platform basins (Purana basins) that host Mesoand Neoproterozoic cycles of sediments that flank five Archean cratonic nuclei (Radhakrishna 1987;Kale and Phansalkar 1991;Ramakrishnan and Vaidyanadhan 2010;Sharma et al 2014;Mazumder and Eriksson 2015). The Purana basins developed in an extensional tectonic regime, display structural contacts with the adjoining MPMB Supplementary material pertaining to this article is available on the Journal of Earth System Science website (http://www.…”

Section: Introductionmentioning

confidence: 99%

Implications of new $$^{40}\hbox {Ar}/^{39}\hbox {Ar}$$ 40 Ar / 39 Ar age of Mallapur Intrusives on the chronology and evolution of the Kaladgi Basin, Dharwar Craton, India

2018

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The Kaladgi Basin on the northern edge of the Dharwar craton has characters diverse from the other epicratonic Purana basins of Peninsular India. Sedimentological studies in the basin have established the presence of three cycles of flooding separated by an event of intra-basinal deformation accompanied by low grade incipient metamorphism. The overall structural configuration of the basin indicates its development by supracrustal extension accompanied by shearing in a trans-tensional regime during the Mesoproterozoic. This was followed by sagging that yielded Neoproterozoic sedimentation in a successor nested basin. 40 Ar/ 39 Ar dating of an intrusive mafic dyke along the axial plane of a fold has yielded a plateau age of 1154±4 Ma. This helps constraint the age of the various events during the evolution of this basin.

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“…The sediments deposited in the offshore Krishna‐Godavari Basin are sourced from the Krishna and Godavari Rivers, which drain the Deccan Traps, Dharwar and Bastar cratons, and rocks of the Godavari graben and Eastern Ghats belt, all of which contain possible source rocks for detrital, magnetic iron oxides (e.g. in mafic volcanics, Fe‐rich schists, iron formations) (Biksham & Subramanian, 1988; Mazumdar et al., 2015; Mazumder & Eriksson, 2015). The Krishna and Godavari Rivers discharge a combined 174 × 10 6 tons of sediment per year, primarily during the summer monsoon season (Biksham & Subramanian, 1988; Ramesh & Subramanian, 1988; Subramanain, 1979) and the Godavari River is among the top 15 largest river sediment discharges in the world (Milliman & Meade, 1983).…”

Section: Geologic Settingmentioning

confidence: 99%

Isolating Detrital and Diagenetic Signals in Magnetic Susceptibility Records From Methane‐Bearing Marine Sediments

Johnson

Phillips

Clyde

et al. 2021

Geochem Geophys Geosyst

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Volume-dependent magnetic susceptibility (κ), the magnetic response of bulk sediment to an applied magnetic field, is indicative of relative abundances of paramagnetic, diamagnetic, and ferrimagnetic minerals, and thus is used extensively to reconstruct paleoenvironments, decipher depositional processes, examine changes in sediment provenance, and understand diagenetic processes in terrestrial and marine settings Abstract Volume-dependent magnetic susceptibility (κ) is commonly used for paleoenvironmental reconstructions in both terrestrial and marine sedimentary environments where it reflects a mixed signal between primary deposition and secondary diagenesis. In the marine environment, κ is strongly influenced by the abundance of ferrimagnetic minerals regulated by sediment transport processes. Post-depositional alteration by H 2 S, however, can dissolve titanomagnetite, releasing reactive Fe that promotes pyritization and subsequently decreases κ. Here, we provide a new approach for isolating the detrital signal in κ and identifying intervals of diagenetic alteration of κ driven by organoclastic sulfate reduction (OSR) and the anaerobic oxidation of methane (AOM) in methane-bearing marine sediments offshore India. Using the correlation of a heavy mineral proxy from X-ray fluorescence data (Zr/Rb) and κ in unaltered sediments, we predict the primary detrital κ signal and identify intervals of decreased κ, which correspond to increased total sulfur content. Our approach is a rapid, high-resolution method that can identify overprinted κ resulting from pyritization of titanomagnetite due to H 2 S production in marine sediments. In addition, total organic carbon, total sulfur, and authigenic carbonate δ 13 C measurements indicate that both OSR and AOM can drive the observed κ loss, but AOM drives the greatest decreases in κ. Overall, our approach can enhance paleoenvironmental reconstructions and provide insight into paleopositions of the sulfate-methane transition zone, past enhancements of OSR or paleo-methane seepage, and the role of detrital iron oxide minerals on the marine sediment sulfur sink, with consequences influencing the development of chemosynthetic biological communities at methane seeps. Plain Language SummaryIn continental margin environments, variation in the magnetic susceptibility (κ) of marine sediments is influenced primarily by the delivery of detrital magnetic minerals from continental erosion and secondarily by diagenetically driven dissolution and/or growth of new magnetic minerals within the sediments. Bulk sediment measurements of κ often record a mixed signal from these processes, making it difficult to distinguish the original depositional detrital signal from in situ diagenetic effects. Here, we provide a new approach for isolating the detrital signal in κ and identifying intervals of diagenetic alteration in methane-bearing marine sediments in the offshore Krishna-Godavari basin, eastern peninsular India. We utilize measurements of κ, magnetic properties, a heavy mineral proxy (Zr/Rb ...

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Chapter 1 Precambrian basins of India: stratigraphic and tectonic context

Cited by 20 publications

References 25 publications

Integration of 2D Lateral Groundwater Flow into the Variable Infiltration Capacity (VIC) Model and Effects on Simulated Fluxes for Different Grid Resolutions and Aquifer Diffusivities

Integration of 2D Lateral Groundwater Flow into the Variable Infiltration Capacity (VIC) Model and Effects on Simulated Fluxes for Different Grid Resolutions and Aquifer Diffusivities

Implications of new $$^{40}\hbox {Ar}/^{39}\hbox {Ar}$$ 40 Ar / 39 Ar age of Mallapur Intrusives on the chronology and evolution of the Kaladgi Basin, Dharwar Craton, India

Isolating Detrital and Diagenetic Signals in Magnetic Susceptibility Records From Methane‐Bearing Marine Sediments

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