Abstract
As part of the gradual Gondwana dispersion that started
in the Jurassic, the Indian tectonic block was rifted away
from the Antarctica-Australian margins, probably in the
Early-Mid Cretaceous and started its long journey to the
north until it collided with Eurasia in the Tertiary. In this
contribution first we will revise geophysical and
geological evidences for the formation of oceanic crust
between India and Antarctica, India and Madagascar, and
India and Somali/Arabian margins. This information and
possible oceanic basin age interpretation are placed into
regional kinematic models. Three important compressional
events NW and W of the Indian plate are the result of the
opening of the Enderby Basin from 132 to 124 Ma, the
first phase of seafloor spreading in the Mascarene basin
approximately from ~90 to 80 Ma, and the incipient
opening of the Arabian Sea and the Seychelles microplate
formation around 65 to 60 Ma. Based on retrodeformation
of the Afghan-Pakistan part of the India-Asia collision
zone and the eastern Oman margin, the ages of regional
ophiolite emplacement and crystallization of its oceanic
crust, as well as the plate tectonic setting of these
ophiolites inferred from its geochemistry, we evaluate
possible scenarios for the formation of intra-oceanic
subduction zones and their evolution until ophiolite
emplacement time. Our kinematic scenarios are
constructed for several regional models and are discussed
in the light of global tomographic models that may image
some of the subducted Cretaceous oceanic lithosphere.
in the Jurassic, the Indian tectonic block was rifted away
from the Antarctica-Australian margins, probably in the
Early-Mid Cretaceous and started its long journey to the
north until it collided with Eurasia in the Tertiary. In this
contribution first we will revise geophysical and
geological evidences for the formation of oceanic crust
between India and Antarctica, India and Madagascar, and
India and Somali/Arabian margins. This information and
possible oceanic basin age interpretation are placed into
regional kinematic models. Three important compressional
events NW and W of the Indian plate are the result of the
opening of the Enderby Basin from 132 to 124 Ma, the
first phase of seafloor spreading in the Mascarene basin
approximately from ~90 to 80 Ma, and the incipient
opening of the Arabian Sea and the Seychelles microplate
formation around 65 to 60 Ma. Based on retrodeformation
of the Afghan-Pakistan part of the India-Asia collision
zone and the eastern Oman margin, the ages of regional
ophiolite emplacement and crystallization of its oceanic
crust, as well as the plate tectonic setting of these
ophiolites inferred from its geochemistry, we evaluate
possible scenarios for the formation of intra-oceanic
subduction zones and their evolution until ophiolite
emplacement time. Our kinematic scenarios are
constructed for several regional models and are discussed
in the light of global tomographic models that may image
some of the subducted Cretaceous oceanic lithosphere.
Original language | English |
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Pages | 187 |
Number of pages | 1 |
Publication status | Published - 17 Jun 2013 |
Event | THE FIRST JOINT SCIENTIFIC MEETING OF GEOLOGICAL SOCIETY OF CHINA AND GEOLOGICAL SOCIETY OF AMERICA (ROOF OF THE WORLD), Chendu, China - Duration: 17 Jun 2013 → 19 Jun 2013 |
Conference
Conference | THE FIRST JOINT SCIENTIFIC MEETING OF GEOLOGICAL SOCIETY OF CHINA AND GEOLOGICAL SOCIETY OF AMERICA (ROOF OF THE WORLD), Chendu, China |
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Period | 17/06/13 → 19/06/13 |