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Subaqueous effusive and explosive phases of late Deccan volcanism: evidence from Mumbai Islands, India

Citation

Duraiswami, RA and Jutzeler, M and Karve, AV and Gadpallu, P and Kale, MG, Subaqueous effusive and explosive phases of late Deccan volcanism: evidence from Mumbai Islands, India, Arabian Journal of Geosciences, 12, (23) Article 703. ISSN 1866-7511 (2019) [Refereed Article]

Copyright Statement

Copyright 2019 Saudi Society for Geosciences

DOI: doi:10.1007/s12517-019-4877-z

Abstract

About 30 m of massive basaltic lava sheets and pillows belonging to the Deccan Traps are exposed at Borivali in the Sanjay Gandhi National Park, Mumbai (India). These lavas are conformably overlain by ∼ 100 m of volcaniclastic deposits exposed in the Kanheri Caves. The pillows are plagioclase-clinopyroxene-phyric, very poorly vesicular, tholeiite basalts and commonly develop one to few central large cavities. Pillow rinds are holohyaline with swallow-tailed lanceolate or slender needle-shaped plagioclase and fan-spherulitic or dendritic textures in clinopyroxene that indicate rapid cooling under water. The volcaniclastic succession lying on top of the pillow lavas is chiefly composed of non-vesicular to scoriaceous/pumiceous, basaltic and andesitic clasts. The numerous sediment dykes within the volcaniclastic succession and the conformably underlying pillow lavas imply that the entire sequence was emplaced in a submarine environment. The fluidal texture and quenched margins in some of the volcanic clasts strongly suggest that at least part of the volcanic clasts were produced by underwater explosive eruptions. This study describes subaqueous erupted pillow lavas in context of continental flood basalts and provides a significant analogy to recent submarine-erupted intraplate oceanic basalts. The occurrence of pillow lavas and volcaniclastic deposits well above the present-day high tide line (160 m) indicates either high eustatic sea level during the Danaian age (61.8-62.9 Ma), or post-rifting regional uplift in the western Deccan Traps.

Item Details

Item Type:Refereed Article
Keywords:pillow lava, hyaloclastite, India, Mumbai
Research Division:Earth Sciences
Research Group:Geology
Research Field:Volcanology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Jutzeler, M (Dr Martin Jutzeler)
ID Code:143431
Year Published:2019
Web of Science® Times Cited:9
Deposited By:CODES ARC
Deposited On:2021-03-17
Last Modified:2021-05-19
Downloads:0

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