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Continents and Supercontinents (Hardcover, New)
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Continents and Supercontinents (Hardcover, New)
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To this day, there is a great amount of controversy about where,
when and how the so-called supercontinents--Pangea, Godwana,
Rodinia, and Columbia--were made and broken. Continents and
Supercontinents frames that controversy by giving all the necessary
background on how continental crust is formed, modified, and
destroyed, and what forces move plates. It also discusses how these
processes affect the composition of seawater, climate, and the
evolution of life.
Rogers and Santosh begin with a survey of plate tectonics, and go
on to describe the composition, production, and destruction of
continental and oceanic crust, and show that cratons or assemblies
of cratons became the first true continents, approximately one
billion years after the earliest continental crust evolved. The
middle part of the book concentrates on supercontinents, beginning
with a discussion of types of orogenic belts, distinguishing those
that formed by closure of an ocean basin within the belt and those
that formed by intracontinental deformation caused by stresses
generated elsewhere. This information permits discrimination
between models of supercontinent formation by accretion of numerous
small terranes and by reorganization of large old continental
blocks.
This background leads to a description of the assembly and
fragmentation of supercontinents throughout earth history. The
record is most difficult to interpret for the oldest
supercontinent, Columbia, and also controversial for Rodinia, the
next youngest supercontinent. The configurations and pattern of
breakup of Gondwana and Pangea are well known, but some aspects of
their assembly are unclear. The book also briefly describes the
histories ofcontinents after the breakup of Pangea, and discusses
how changes in the composition of seawater, climate, and life may
have been affected by the sizes and locations of continents and
supercontinents.
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