By A. Kröner (Eds.)
ISBN-10: 0444418636
ISBN-13: 9780444418630
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1975). , at least three 1800-1700Ma andesitic arcs are identifiable with petrochemical polarity overlying sub-arc oceanic crust and there are remnants of synchronous arcs in six states farther east. These intraoceanic arcs are flanked by thick flysch-like greywacke and volcanoclastic sequences analogous to trench-slope deposits, and by finer clastics in backarc basin-like deposits, and are capped by molasse-basin assemblages. Syntectonic, synvolcanic granodiorite, minor tonalite and granite batholiths intrude the base of the arc assemblages and are restricted to an intra-arc setting.
Possible late-Precambrian ophiolites in Africa and Brazil. In: Univ. Leeds: Res. Inst. Afr. , Annu. , 20: 3-7. Stauffer, M. , Mukherjee, A. C. , 1975. The Amisk Group: an Aphebian? island arc deposit. Can. J. , 12: 2021-2035. , 1976. Geochemistry of Archaean high-grade gneisses with implications as t o the origin and evolution of the Precambrian crust. In: B. F. Windley (Editor), The Early History of the Earth. Wiley, London, pp. 405-417. , Dalziel, I. W. D. and De Wit, M. , 1976. Marginal basin ‘Rocas Verdes’ complex from S.
Meddr. Grgnland, 172, Nr. 8. Windley, B. , 1977a. The Evolving Continents. Wiley, London, 385 pp. Windley, B. , 1977b. Timing of continental growth and emergence. Nature, 270: 4 2 6-4 28. Windley, B. F. and Smith, J. , 1976. Archaean high-grade complexes and modern continental margins. Nature, 260 : 671-675. Zeck, H. P. , 1976. W. Sweden? Tectonophysics, 31: T35-T40. Chapter 2 PRECAMBRIAN TECTONIC STYLE: A LIBERAL UNIFORMITARIAN INTERPRETATION R. B. HARGRAVES ABSTRACT Major uncertainties impeding clarification of the Precambrian geologic record are: (1) its thermal history; (2) the history of the growth of continental crust; and (3) tectonic style.
Precambrian plate tectonics by A. Kröner (Eds.)
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