What lies beneath the Deccan volcanic province? Perspective on tectonic elements and sub-trappean geology from gravity signatures

Rao, J. V. Rama; Ravikumar, B; Golani, P. R.

doi:10.1007/s12040-021-01787-9

Cited by 3 publications

(1 citation statement)

References 66 publications

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“…Looking at them in the Cartesian space, they do not appear as radiating fans which leads us to think that these linkages may be artifacts of HT distortion which occur due to the extremely large area over which the HT is taking place. Although the radial structures are more clear for the Deccan Traps, there is no clear geological or geophysical evidence of a localized magma reservoir associated with the center of the radial dike swarms to date (Dole et al., 2022; Rajaram et al., 2017; Rao et al., 2022; Self et al., 2022b). The radial patterns we observe may instead represent a time evolving stress state in which successive linear trends are emplaced with changes in angle such as in Figure 7b.…”

Section: What Multiscale Structure Exists In the Cfb Data Sets?mentioning

confidence: 99%

Multiscale Spatial Patterns in Giant Dike Swarms Identified Through Objective Feature Extraction

Kubo Hutchison,

Karlstrom,

Mittal

2023

Geochem Geophys Geosyst

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Dike swarms are ubiquitous on terrestrial planets and represent the frozen remnants of magma transport networks. However, spatial complexity, protracted emplacement history, and uneven surface exposure typically make it difficult to quantify patterns in dike swarms on different scales. In this study, we address this challenge using the Hough transform (HT) to objectively link dissected dike segments and analyze multiscale spatial structure in dike swarms. We apply this method to swarms of three scales: the Spanish Peaks, USA; the Columbia River Flood Basalt Group (CRBG), USA; the Deccan Traps Flood Basalts, India. First, we cluster dike segments in HT space, recognizing prevalent linearly aligned structures that represent single dikes or dike packets, with lengths up to 10 − 30x the mapped mean segment length. Second, we identify colinear and radial dike segment mesoscale structures within each data set, using the HT to segment swarms into constituent spatial patterns. We show that for both the CRBG and Deccan Traps, a single radial or circumferential swarm does not well characterize the data. Instead, multiple and sometimes overlapping mesoscale linear and radial features are prevalent suggesting a complex history of crustal stresses. The HT can provide useful insights in a variety of geologic settings where many quasi‐linear features, at any scale, are superimposed spatially.

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Section: What Multiscale Structure Exists In the Cfb Data Sets?mentioning

confidence: 99%

Multiscale Spatial Patterns in Giant Dike Swarms Identified Through Objective Feature Extraction

Kubo Hutchison,

Karlstrom,

Mittal

2023

Geochem Geophys Geosyst

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Well Hydraulics in Parts of Western Vidarbha Region in Deccan Traps, India

Mishra

Toppo

Naik

et al. 2023

Journal of the Geological Society of India

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Deccan Traps cover about 15% (500,000 sq. km) of India’s landmass, and about 82% of Maharashtra state. They deliver fluctuating hydraulic results due to their disposition as a multilayered aquifer system. The drawdown and recovery data of eight exploratory wells in Akola, Buldhana and Washim districts of western Vidarbha region in Maharashtra state were analyzed to define the aquifer characteristics in basalts. Conventional methods such as those suggested by Theis (1935), Jacob-Cooper (1946), Chow (1952) and Walton (1962) were used to estimate aquifer parameters such as transmissivity (T) and storativity (S). The advantages and limitations of these methods were critically examined from their applicability perspective. Estimated values of T ranged from 7 to 133 m2/day and those of S from 6.05x10-4 to 1.63x10-2, showing poor yields in most parts. In this study, Jacob-Cooper (1945) and Theis recovery (1935) methods were found easy to adopt and yielded rapid results compared to Theis curve matching (1935), Chow (1952) and Walton (1962) methods that typically involve either curve matching or complex computational techniques.

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Magnetotelluric imaging reveals fragmented crustal blocks beneath the Konkan plains adjoining the Western Ghats, Deccan Volcanic Province, India

Chakravarthi,

Pavankumar,

Manglik

2023

Physics of the Earth and Planetary Interiors

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What lies beneath the Deccan volcanic province? Perspective on tectonic elements and sub-trappean geology from gravity signatures

Cited by 3 publications

References 66 publications

Multiscale Spatial Patterns in Giant Dike Swarms Identified Through Objective Feature Extraction

Multiscale Spatial Patterns in Giant Dike Swarms Identified Through Objective Feature Extraction

Well Hydraulics in Parts of Western Vidarbha Region in Deccan Traps, India

Magnetotelluric imaging reveals fragmented crustal blocks beneath the Konkan plains adjoining the Western Ghats, Deccan Volcanic Province, India

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