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Igneous Rocks of South-West England (Paperback, Softcover reprint of the original 1st ed. 1993)
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Igneous Rocks of South-West England (Paperback, Softcover reprint of the original 1st ed. 1993)
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This volume illustrates some of the significant aspects of magmatic
activity from Devonian (408 million years ago) to early Permian
(270 million years ago) times in SW England. This period covers the
progressive development of the Variscan mountain-building episode,
from initial basin formation to final deformation and the
subsequent development of a fold mountain belt - the Variscan
Orogen. Both extrusive (volcanic) and intrusive (plutonic) rocks
are found in the orogen, and chart the various stages of its
magmatic development. The sites described in this volume are key
localities selected for conservation because they are
representative of the magmatic history of the orogen from
initiation to stabilization. Some of the earliest volcanic activity
in the Devonian is represented by submarine basaltic and rhyolitic
lavas developed in subsiding basins, caused by the attenuation of
the existing continental crust. In some cases, extensive rifting
and attendant magmatism produced narrow zones of true oceanic
crust, whereas elsewhere basaltic volcanism is related to fractures
in the continental crust at the margins of the basins. After the
filling of the sedimentary basins, and their deformation caused by
crustal shortening (late Carboniferous Period), further activity is
manifested by the emplacement of the Cornubian granites and later
minor basaltic volcanism in the early Permian. Accounts of the
constituent parts of this history have enriched geological
literature from the nineteenth century onwards, and have
contributed to the advancement and understanding of magmatic and
tectonic processes.
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