Download e-book for iPad: Chemical Evolution of the Early Precambrian by Cyril Ponnamperuma (Eds.)

By Cyril Ponnamperuma (Eds.)

ISBN-10: 0125613601

ISBN-13: 9780125613606

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Extra info for Chemical Evolution of the Early Precambrian

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Preliminary results of such studies for a selected suite of rocks are shown in Fig. 2 and Table 1. Note that younger rocks tend to begin to lose volatile carbon at a lower temperature than older rocks and that both seem to reach constant residual carbon contents at 600°C. For this reason we have selected a pyrolysis treatment of 600°C under a flowing nitrogen atmosphere for 2 hr as a suitable treatment to provide for reproducible measure of residual carbon. In Table 1, regularities may be noted in the residual carbon C R to organic carbon C Q ratios with age.

W. 1975. Nature (London), 257: 721. Hurst, R. , Collersen, K. , and Wetherill, G. W. 1975. Earth Planet. Sei. Lett. 27:393. 4 THREE ARGUMENTS FOR CONTINUAL EVOLUTION OF SIAL THROUGHOUT GEOLOGIC TIME JOHN J. W. ROGERS University of North Carolina, Chapel Hill Many theories for the evolution of continental material envision segregation of most presently existing sial during the early stages of earth history, with later orogenic events largely reworking this initial material. The early formation of the continents simplifies the problem of explaining the apparent constancy of sea level relative to continental elevation throughout much of geologic time.

Geochim. 39:325. Baragar, W. R. A. 1966. Canad. Boyle, R. W. 1961. Geol. Surv. Davidson, A. 1972. Geol. Surv. Cosmochim. J. , 3:9. Canad. , 310. Canad. Pap. 72-1A, p. 109. Eade, K. , and Fahrig, W. F. 1971. Geol. Surv. Canad. Acta. , 179. Folinsbee, R. , Cumming, G. , and Green, D. C. 1968. Amer. Geophys. Union, 12:441. Frith, R. , Hill, J. and Leather- barrow, R. 1974. Geol. Surv. Canad. Pap. 74-1A, p. 165. Glickson, A. Y. 1972. Geol. Soc. Amer. , 83:3323. HENDERSON Green, D. C , and Baadsgaard, H.

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Chemical Evolution of the Early Precambrian by Cyril Ponnamperuma (Eds.)


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