Atlas of rock-forming minerals in thin section - download pdf or read online

By W. S. MacKenzie, C. Guilford

ISBN-10: 058245591X

ISBN-13: 9780582455917

'Hurray for Mackenzie and Guilford for finally we have now a pictorial advisor to the rock-forming minerals! ...such feasts of color in mineralogy books are infrequent admirable advisor' New Scientist

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In the tables of analyses of igneous rocks from different tectonic settings, presented in Chapters 5-12, the analytical techniques employed have not been specified. In all cases major elements (expressed as wt. % constituent oxides) have been determined by XRF and trace elements (expressed as parts per million, or ppm) by a combination of XRF, INNA and isotope dilution. In general, analyses of H 20, CO 2 and the Fe2+ / Fe3+ ratio are not listed, and the Fe content is expressed as total FeO or Fe203' In some XRF analyses the total volatile content is approximately expressed as the loss on ignition (LOI).

This smooths out the concentration 18 IGNEOUS ROCKS AS PETROGENETIC INDICATORS variations from element to element. Chondrites are used in the normalization procedure because they are primitive solar system material which may have been parental to the Earth. Fig. 3 shows a range of chondrite-normalized REE patterns for basaltic rocks. 3 Schematic chondrite-normalized REE patterns for basaltic rocks. Normalization constants from Nakamura (1974) are indicated on the diagram. (a) Strongly light-REE enriched basalt with very low concentrations of heavy REE suggests the presence of residual garnet in the source: extremely high concentrations of light REE suggest very small degrees of partial melting or a light-REE enriched source.

The straight lines in this diagram are isochrons for ages 0, 1, 2 and 3 Ga. All single-stage leads that were removed from their sources at time t must lie on these isochrons, even if they grew in different source regions (Faure 1986). The line for t = 0 is called the geochron, and all modem single-stage leads in the Earth and in meteorites must lie on it. Igneous rocks contain Pb, the isotopic composition of which reflects multistage histories, having evolved in systems with varying UlPb and ThlPb ratios for varying lengths of time.

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Atlas of rock-forming minerals in thin section by W. S. MacKenzie, C. Guilford

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