The Deccan tholeiite lavas and dykes of Ghatkopar–Powai area, Mumbai, Panvel flexure zone: Geochemistry, stratigraphic status, and tectonic significance

Sheth, Hetu; Zellmer, Georg F.; Demonterova, Е. I.; Ivanov, Alexei V.; Kumar, Rohit; Patel, Rakesh Kumar

doi:10.1016/j.jseaes.2013.05.007

Cited by 44 publications

(26 citation statements)

References 51 publications

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“…1998 photo by Sheth. a much smaller remnant now exists and is the dyke MMD1 of Sheth et al (2014). b Very thick Satdhara multiple dyke PMD11, damming the Denwa River 15 km nnE of Pachmarhi (Sheth et al 2009).…”

Section: Figmentioning

confidence: 99%

Are flood basalt eruptions monogenetic or polygenetic?

Sheth

Cañón‐Tapia

2014

Int J Earth Sci (Geol Rundsch)

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Section: Figmentioning

confidence: 99%

Are flood basalt eruptions monogenetic or polygenetic?

Sheth

Cañón‐Tapia

2014

Int J Earth Sci (Geol Rundsch)

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“…Many previous studies clearly show a variation in the chemical composition of the lava flows in different sub‐provinces of the DVP, suggesting that the eruptions within the DVP are not time‐transgressive (Sheth et al, , and references therein). These inferences support the episodic nature of the eruptions within the entire volcanic province (Keller et al, ).…”

Section: Introductionmentioning

confidence: 93%

Faunal elements from the Deccan volcano‐sedimentary sequences of India: A reappraisal of biostratigraphic, palaeoecologic, and palaeobiogeographic aspects

Kapur¹,

Khosla

2018

Geological Journal

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The sedimentary sequences associated with the Deccan Flood Basalts, i.e., infratrappean and intertrappean deposits, are known to yield a diverse assemblage of fauna that includes foraminiferans, ostracods, molluscs, fishes, frogs, turtles, lizards, snakes, crocodiles, dinosaurs, and mammals. The existing literature debates the exact nature of origin, age, and duration of the Deccan volcanic activity; however, there is a general accord within the geosciences community that the Deccan Flood Basalts bestrode the Cretaceous–Palaeogene Boundary. Within the past few decades, the record of the biotic component (particularly faunal elements) reported from the Deccan‐volcano sedimentary sequences have grown both numerically and taxonomically. Constraining the age of the Deccan‐volcano sedimentary sequences has a direct bearing on the studies that discuss the origin, evolution of the biota in a palaeobiogeographic framework, and also in the context of changes in the palaeoenvironment and palaeoecology. Thus, it becomes important to reinforce the age, environment of the Deccan‐volcano sedimentary sequences, and the origin/affinity of the faunal elements recovered from within these sedimentary deposits. We here reappraise the biotic (with an emphasis on the fauna) evidence in a biostratigraphic, palaeoecologic, and palaeobiogeographic aspect.

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“…The island of Mumbai in the westernmost Deccan province (Figure 1a,c) shows a compositionally diverse volcanic sequence (tholeiite, spilite, and rhyolite lava flows and pyroclastics) with mafic and felsic intrusions, dipping west at~18 • (e.g., [35][36][37][38]). The Mumbai tholeiitic flows and dykes show geochemical differences with the WG sequence [39], and the entire Mumbai sequence is 62.5 Ma in age (Danian), as known from palaeontological evidence on inter-lava sedimentary and pyroclastic beds [40,41] and 40 Ar/ 39 Ar dating [23,42]. The Mumbai sequence (Salsette Subgroup of [43], Figure 1b,c) is thus significantly younger than, and unrelated to, the WG sequence.…”

Section: Introduction: Flood Basalts Rifted Continental Margins Andmentioning

confidence: 93%

“…na = not analyzed. 40 Ar/ 39 Ar and U-Pb zircon ages available for several of these stratigraphic units are given in [31]. In (a), the dashed blue line is the Western Ghats escarpment (WGE), NTDS is the Narmada-Tapi dyke swarm, CDS the Coastal dyke swarm, and NPDS the Nasik-Pune dyke swarm ( [8] and references therein).…”

Section: Introduction: Flood Basalts Rifted Continental Margins Andmentioning

confidence: 99%

Geochemistry of Deccan Tholeiite Flows and Dykes of Elephanta Island: Insights into the Stratigraphy and Structure of the Panvel Flexure Zone, Western Indian Rifted Margin

et al. 2020

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Elephanta Island near Mumbai is an important area for understanding the stratigraphic and structural framework of the Deccan flood basalt province in the tectonically disturbed Panvel flexure zone on the western Indian rifted margin. Elephanta exposes a west-dipping, 66–65 Ma sequence of tholeiitic lava flows and dykes. Geochemical correlations with the thick, horizontal, 66–65 Ma Western Ghats sequence to the east show that lava flows of the Khandala and Ambenali formations are present at Elephanta, with two lava flows probably being locally derived. The Elephanta tholeiites have experienced crystal fractionation and accumulation, particularly of olivine. They have εNd(t) ranging from +5.4 to −7.9 and (87Sr/86Sr)t from 0.70391 to 0.70784, with most tholeiites little contaminated by continental lithosphere, probably lower crust. Field and geochemical data indicate a normal fault along the central part of Elephanta with a 220 m downthrow, consistent with a domino-type block-faulted structure of Elephanta, and the surrounding area as previously known. Seventeen of the 20 analyzed Elephanta intrusions, striking ~N–S, belong to the Coastal dyke swarm of the western Deccan province. Several of these are probable feeders to the Ambenali Formation in the Western Ghats sequence, requiring reconsideration of the current view that the voluminous Wai Subgroup lavas of the Western Ghats were erupted without organized crustal extension. East–west-directed extensional strain was already active at 66–65 Ma along this future (62.5 Ma) rifted continental margin. A young (~62 Ma) ankaramite dyke on Elephanta Island is a probable feeder to the Powai ankaramite flow in the 62.5 Ma Mumbai sequence 20 km to the northwest.

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The Deccan tholeiite lavas and dykes of Ghatkopar–Powai area, Mumbai, Panvel flexure zone: Geochemistry, stratigraphic status, and tectonic significance

Cited by 44 publications

References 51 publications

Are flood basalt eruptions monogenetic or polygenetic?

Are flood basalt eruptions monogenetic or polygenetic?

Faunal elements from the Deccan volcano‐sedimentary sequences of India: A reappraisal of biostratigraphic, palaeoecologic, and palaeobiogeographic aspects

Geochemistry of Deccan Tholeiite Flows and Dykes of Elephanta Island: Insights into the Stratigraphy and Structure of the Panvel Flexure Zone, Western Indian Rifted Margin

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