Migmatization and 'secondary' granite magmas: effect of emplacement and crystallization of 'primary' granitoids in Southern Bohemia, Austria

Article Abstract:

Formation of infracrustal I-type granitoids can occur place at any place in the crust and not only at places of high temperature. Under certain conditions, 'secondary' granites are formed from the heat and fluid of granite magmas. Researchers analyzed petrographic and geochemical information on emplaced granitoids of the pre-batholitic, Moldanubian middle crust complex in Southern Bohemia, Austria. The Muhl zone underwent slight melting during formation caused by additional heat from the intrusion of the Weinberg granite. The temperature required for melting the rocks is probably more than 850 degrees C.

Analysis, Origin, Rocks, Metamorphic, Metamorphic rocks, Granite, Batholiths

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Correction to Roberts and Clemens (1995) "Feasibility of AFC models for the petrogenesis of calc-alkaline magma series."(Correction Notice)

Article Abstract:

Two errors appeared in a paper published in 1995 which evaluated the uses of the Assimilation and Fractional Crystallisation (AFC) model developed in the late 1970s and early 1980s. There was a typographical error in part 2(i) of the Appendix, being Eq. 6 of Aitcheson and Forrest (1994). There was also an error in Eq. 6 in the spreadsheet used to calculate the rho values from the elemental concentrations. It led to the generation of rather unusual curves on plots of rho versus r, being the ratio of the rate of assimilation to the rate of fractional crystallisation.

Crystallization, Correction Notice

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Feasibility of AFC models for the petrogenesis of calc-alkaline magma series

Article Abstract:

An assimilation and crystallization model, used to study petrogenesis of calc-alkaline magma series, is based on geological constraints on the identities of parent magma and candidate assimilants. Also Sm-Nd and Rb-Sr isotope systematics of rocks are taken into consideration. Isotope array for rocks in Variscan, calc-alkaline Querigut complex in the French Pyrenees, is known using the model. Results are inconsistent with those obtained using major- and trace-element concentrations.

Research, Natural history, Magma, Pyrenees, Petrogenesis

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