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Trace element differences between Archean, Proterozoic and Phanerozoic crustal components: Implications for crustal growth processesCritical to models for continental crust growth and recycling are the processes through which crustal growth takes place. In particular, it is important to know whether these processes have changed fundamentally with time in response to the earth's thermal evolution, and whether the crustal compositions generated are compatible with crustal remobilization, crustal recycling, or represent primary additions. There are some significant and consistent differences in the major and trace element compositions of crustal components with time which have important implications for crustal growth processes. These will be illustrated with reference to Archean rocks from a number of shield areas, Proterozoic granitoids from Australia and elsewhere, Palaeozoic granitoids from Australia and Scotland, and Mesozoic - recent granitoids from present continental margin belts. Surprisingly some rather simple and consistent patterns energy using this technique. There are then significant differences in compositions of granitoid crustal additions throughout geological time, with a particular type of granitoid apparently dominating a particular time period. This implies that the tectonic processes giving rise to granite generation have changed in response to the earth's thermal evolution.
Document ID
19880020859
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Tarney, J.
(Leicester Univ. (England), United States)
Wyborn, L. E. A.
(Baals (Donald D.) Newport News, VA., United States)
Sheraton, J. W.
(Bureau of Mineral Resources Geology and Geophysics, Canberra (Australia), United States)
Wyborn, D.
(Bureau of Mineral Resources Geology and Geophysics, Canberra, Australia)
Date Acquired
September 5, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Lunar and Planetary Inst., Workshop on the Growth of Continental Crust
Subject Category
Geophysics
Accession Number
88N30243
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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