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Evidence for multiphase folding of the central Indian Ocean lithosphere

K. S. Krishna, J. M. Bull and R. A. Scrutton
Evidence for multiphase folding of the central Indian Ocean lithosphere
Geology (Boulder) (August 2001) 29 (8): 715-718

Abstract

Long-wavelength (100-300 km) folding in the central Indian Ocean associated with the diffuse plate boundary separating the Indian, Australian, and Capricorn plates is Earth's most convincing example of organized large-scale lithospheric deformation. To test the timing and mechanics of this deformation as implied by plate- kinematic and deformation models, we present a new analysis of the seismic stratigraphy of the Bengal Fan sediments. This analysis shows that the folding of the oceanic lithosphere was multiphase, with major events occurring in the Miocene (8.0-7.5 Ma), Pliocene (5.0-4.0 Ma), and Pleistocene (0.8 Ma). The Miocene phase was the most intense and involved deformation of an area south of 1 degrees S, whereas in the Pliocene the activity shifted northward. In the final phase (Pleistocene), the activity was focused in the equatorial region. No evidence was found for deformation prior to 8.0-7.5 Ma. The spatial extent of the Pleistocene folding event overlaps the Pliocene and/or Miocene folding events and coincides with both the area of most active faulting and the zone of greatest historical seismicity. The seismic data show that the timing of reverse faulting, and thus more significant shortening of the lithosphere, generally coincided with the phases of folding, but there are examples of folding of the oceanic lithosphere without associated reverse faulting.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 29
Serial Issue: 8
Title: Evidence for multiphase folding of the central Indian Ocean lithosphere
Affiliation: National Institute of Oceanography, Dona Paula, Goa, India
Pages: 715-718
Published: 200108
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 21
Accession Number: 2001-076337
Categories: Solid-earth geophysicsApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
S08°07'18" - S08°07'18", E86°47'30" - E86°47'30"
N08°00'25" - N08°00'26", E86°16'58" - E86°16'59"
Secondary Affiliation: Southampton University, GBR, United KingdomEdinburgh University, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200124
Program Name: ODPOcean Drilling Program
Program Name: DSDPDeep Sea Drilling Project
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