Cocos Plate
The
Cocos Plate
is an oceanic
tectonic plate
beneath the
Pacific Ocean
off the west coast of
Central America
. The Cocos Plate is created by
sea floor spreading
along the
East Pacific Rise
, specifically in a complicated area geologists call the Cocos-Nazca spreading system. From the rise the plate is pushed eastward and pushed or dragged (perhaps both) under the less dense overriding
Caribbean Plate
in the process called
subduction
. The subducted leading edge heats up and adds its water to the mantle above it. In the mantle layer called the
asthenosphere
, mantle rock melts to make
magma
. As a result, to the northeast of the subducting edge is the continuous arc of
volcanos
stretching from
Costa Rica
to
Guatemala
and a belt of earthquakes that extends farther north, into
Mexico
. The northeastern and eastern sides are
convergent boundaries
subducting under the
North American Plate
, the
Caribbean Plate
, and the
South American Plate
. The Cocos Plate is bounded by divergent boundaries to the south with the
Nazca Plate
and to the west with the
Pacific Plate
. The Cocos and Nazca Plates are the remnants of the former
Farallon Plate
, which broke up about 23 million years ago. The boundary between the plates is marked by a
hotspot
under the
Galapagos Islands
External links
the volcanic arc
Martin Meschede and Udo Barckhausen, "Plate tectonic evolution of the Cocos-Nazca plate"
: reconstructing its geological evolution
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