Geochemistry of the Palitana flood basalt sequence and the Eastern Saurashtra dykes, Deccan Traps: clues to petrogenesis, dyke–flow relationships, and regional lava stratigraphy

Geochemistry and 40Ar/39Ar geochronology of the Nandurbar‐Dhule mafic dyke swarm: Dyke‐sill‐flow correlations and stratigraphic development across the Deccan flood basalt province

“…Analytical errors are much smaller than the sizes of the symbols. Data sources are as follows: Nandurbar‐Dhule dykes (this study and Vanderkluysen et al, ), Mandla lobe flows (Shrivastava, Mahoney, & Kashyap, ), Toranmal flows and dykes (Mahoney et al, ), Shahada‐Shirpur area (including Boradi) dykes (Chandrasekharam, Mahoney, Sheth, & Duncan, ), Palitana flows (Sheth et al, ), Pachmarhi dyke and Chakhla‐Delakhari sill (Sheth et al, ), Rewa‐Shahdol dyke RB‐110 (Lala et al, ), Salma dyke in the Rajmahal Traps (Kent et al, ), Kolhapur unit of the southernmost Deccan (Lightfoot et al, ), and the Rajmachi and Paten Basalt members of the Western Ghats sequence (Vanderkluysen et al, )…”

“…Other tholeiitic sequences in the province, such as Toranmal and Ellora‐Ajanta‐Lonar (see Figure for all localities mentioned in this paper), are broadly correlatable with the Western Ghats type section (e.g., Jay & Widdowson, ; Mahoney, Sheth, Chandrasekharam, & Peng, ; Peng, Mahoney, Hooper, Macdougall, & Krishnamurthy, ; Peng, Mahoney, Hooper, & Vanderkluysen, ; Subbarao, Chandrasekharam, Navaneethakrishnan, & Hooper, ). Yet other stratigraphically and petrogenetically unrelated tholeiitic sequences, such as Pavagadh and Palitana, suggest polycentric eruptions (e.g., Sheth & Melluso, ; Sheth, Zellmer, Kshirsagar, & Cucciniello, ). The Western Ghats sequence has recently been geochronologically bracketed by high‐precision U–Pb ages (on zircon) of 66.288 ± 0.027 Ma for the Jawhar Formation (Fm.)…”

“…These are the ENE‐WSW‐trending Narmada‐Tapi dyke swarm, in the region of the Narmada and Tapi rivers and the intervening Satpura mountains (e.g., Bhattacharji, Chatterjee, Wampler, Nayak, & Deshmukh, ; Ray et al, ; Sant & Karanth, ), the NNW‐SSE‐trending Coastal dyke swarm, on the Konkan plain between the western Indian coast and the Western Ghats escarpment (e.g., Dessai & Viegas, ; Hooper, Widdowson, & Kelley, ; Sheth et al, ; Widdowson, Pringle, & Fernandez, ), and the Nasik‐Pune dyke swarm east of the Western Ghats escarpment, with more randomly oriented dykes than the other two (e.g., Bondre, Hart, & Sheth, ; Vanderkluysen et al, ). Abundant tholeiitic dykes also outcrop in the Saurashtra peninsula in the northwestern Deccan (Figure ), forming a westerly extension of the Narmada‐Tapi dyke swarm (Auden, ; Cucciniello, Demonterova, Sheth, Pande, & Vijayan, ; Sheth et al, ). Additional Deccan tholeiitic dykes outcrop in east‐central India between the outcrop areas of the Deccan and the Early Cretaceous (~115 Ma) Rajmahal Traps (Chalapathi Rao et al, ; Kent, Saunders, Kempton, & Ghose, ).…”

Geophysical Identification and Characterization of Mafic-Ultramafic Intrusions in Plume Centre Regions

“…Included in all models are crustal information from CRUST1.0 and crustal information from geophysical studies and drilling near D1, D2 and D3 within the Cambay rift, which indicate that the Deccan basalts have a typical thickness of 4 km in this region (Ramanathan 1981;Sheth et al, 2013).…”

Temporal and petrogenetic constraints on age-progressive volcanism in eastern Australia

“…Intraplate volcanism, particularly flood basalts and hotspot tracks, record important information on thermal and geochemical anomalies in the mantle (e.g., Leeman, 1982;Sheth et al, 2013;Kamenetsky et al, 2016). Magmas derived from a depleted upper mantle (DM) or variously enriched lower mantle source components (e.g., high µ (HIMU), enriched mantle I (EMI), enriched mantle II (EMII)) inherit the geochemical characteristics unique to these sources (e.g.…”