Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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The Songir Structure: Inflated Lava Flow or Tube?


Affiliations
1 A/6 Gurudut Housing Society, Srinagar, Kalewadi Phata, Rahatani, Pune - 411 017, India
2 Department of Geology, University of Pune, Pune - 411 007, India
3 Department of Geology, Miami University, Oxford, Ohio - 45056, United States
 

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A ∼9.75 km long, sinuous structure exposed near village Songir, east of Dhile has been previously interpreted to be a lava tube on the basis of remote sensing and field checks. Detailed field investigations, however, reveals an overlapping sequence of P-Type lobes and sheets, constituting a small compound pahoehoe flow, whose sinuous form has been guided by Pre-Existing topography. The Songir structure is undoubtedly a small, Sheet-Flow that propagated by repeated branching of toes and lobes that have been emplaced through the mechanism of inflation. This pahoehoe flow does not bear any resemblance to a lava tube. The study of the Songir structure reiterates the fact that greater caution should be exercised while identifying similar structures in the large and ancient Continental Flood Basalt provinces.
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  • The Songir Structure: Inflated Lava Flow or Tube?

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Authors

Raymond A. Duraiswami
A/6 Gurudut Housing Society, Srinagar, Kalewadi Phata, Rahatani, Pune - 411 017, India
Gauri Dole
Department of Geology, University of Pune, Pune - 411 007, India
Ninad Bondre
Department of Geology, Miami University, Oxford, Ohio - 45056, United States

Abstract


A ∼9.75 km long, sinuous structure exposed near village Songir, east of Dhile has been previously interpreted to be a lava tube on the basis of remote sensing and field checks. Detailed field investigations, however, reveals an overlapping sequence of P-Type lobes and sheets, constituting a small compound pahoehoe flow, whose sinuous form has been guided by Pre-Existing topography. The Songir structure is undoubtedly a small, Sheet-Flow that propagated by repeated branching of toes and lobes that have been emplaced through the mechanism of inflation. This pahoehoe flow does not bear any resemblance to a lava tube. The study of the Songir structure reiterates the fact that greater caution should be exercised while identifying similar structures in the large and ancient Continental Flood Basalt provinces.