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Volcanology and lava flow morpho-types from the Koyna-Warna, Region, Western Deccan Traps, India

Duraiswami, Raymond A., Gadpallu, Purva, Maskare, Babaji, Purwant, Aishwarya, Meena, Pooja, Krishnamurthy, P., Mahabaleshwar, B.·2017·Journal of the Geological Society of India
DOI 10.1007/s12594-017-0785-6
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Abstract

Flow mapping and physical volcanology of 15 basaltic lavas exposed in three critical road pass sections (ghats) in the Koyna-Warna region of the western Deccan Traps is presented in this paper. Transitional lavas like rubbly pahoehoe are most common morpho-type exposed in these ghat sections. Sinking of rubbly breccia into flow interiors and formation of breccia-cored rosette are common in some lava flows. Few rubbly lavas exhibit slabby tendencies. The amount and nature of the associated rubble is variable and result from the mechanical fracturing and auto-brecciation of the upper vesicular crust in response to distinctive stages in the cooling, crystallization and emplacement history of individual lava flows. Occurrence of aa and pahoehoe morpho-types in the lava flow sequence is subordinate. Three prominent pahoehoe flows separated by red bole horizons are seen in the upper parts of the Kumbharli ghat. These are thick, P-type sheet pahoehoe. The pahoehoe lavas represent compound flow fields that grew by budding, endogenous lava transfer and inflation. Presence of pahoehoe lavas in the Koyna-Warna region hints at possible hitherto unrecorded southern extension of Bushe-like flow fields. This study reconfirms the existence of pahoehoe-slabby-rubbly-aa flow fields and transitions even in the upper echelons of the Deccan Trap stratigraphy. The study of morphology and internal structure of lava flows exposed at the ghat sections in the Koyna-Warna region could guide sub-surface core-logging that is critical in deciphering the physical volcanology and emplacement dynamics of basaltic lava flows penetrated by drill holes sunk under the scientific deep drilling programme.

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Research works printed but not linked: 28

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Cited by

Metadata

Authors
Duraiswami, R. A., Gadpallu, P., Maskare, B., Purwant, A., Meena, P., Krishnamurthy, P., & Mahabaleshwar, B.
Affiliations
  • Department of Geology, Savitribai Phule Pune University 1 ,  Pune - 411 007
  • Department of Environmental Sciences, Savitribai Phule Pune University 2 ,  Pune - 411 007
  • Geological Society of India 3 ,  No.63, 12th Cross, Basappa Layout, Gavipuram, Bengaluru - 560 019
Venue
Journal of the Geological Society of India
Publisher
Geological Society of India
Published
2017-12-01
Volume
90
Issue
6
Pages
742-747
ISSN
  • 0974-6889
  • 0016-7622
DOI
10.1007/s12594-017-0785-6
Cited by
29
References
0
Language
en
Licence
www.springer.com/tdm (unspecified)

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