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Early Precambrian Basic Magmatism (Paperback, Softcover reprint of the original 1st ed. 1990)
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Early Precambrian Basic Magmatism (Paperback, Softcover reprint of the original 1st ed. 1990)
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Basic magmatic rocks make up approximately three-quarters of the
crust ofthe present day Earth. Because we can observe and study the
volcanic products of present day tectonic regimes comprehensively,
we can shed light on ancient tectono-magmatic provinces, and
thereby deduce the petrogenesis and evolution of the oldest basic
rocks. This is the primary objective of this book. The book was
conceived in order to provide a comprehensive review of the basic
rocks produced during the first half of the Precambrian, i.e. the
Archaean and early Proterozoic, to about 1.8 Ga years ago. Two
major questions are addressed. First, what basic magmas were
generated during the early Precambrian: were these magmas globally
uniform, and to what extent were prevailing tectonic controls and
compo sitions analogous to those of the present day? Clearly, this
can be answered only by bringing together fundamental information
about all relevant basic magmatic events. Second, is there any
systematic temporal variation in the nature of basic suites, and
what implications might such variations have on our interpretations
of early Earth history? Are there important differences between
early Archaean, late Archaean, Proterozoic and modern basic
magmatic suites? The book uses two approaches to address these
questions. Early chapters examine the fundamental characteristics
of these basic rocks, whilst later chapters assess regional
distribution and development by providing an overview of each major
early Precambrian craton."
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