Objective
An extensive region occupying well over 5000 square kilometres in the western part of the Central Iberian Massif (Spain) has been studied. The excellent quality of the outcrops and the variety of igneous rocks in the area studied are particularly favourable for testing current hypotheses dealing with the origin of cordierite bearing granites and/or alternatively to propose a model to explain the origin of these rocks on a batholithic scale.
The most important conclusions are that:
Cordierite in granites and cordierite in high grade host rocks are indistinguishable. Textural and chemical data show that there are no significant differences between both groups of cordierite.
Biotite granite (BG) and amphibole bearing biotite granite (AG) show remarkable chemical (major and trace elements) and isotopic (stable and radiogenic) affinities, suggesting similar sources.
BG and cordierite bearing biotite granite (CG) also show remarkable chemical and isotopic affinities despite the mineralogical differences. CG data plot in an intermediate position between nebulites (NB) and BG in different element-element diagrams.
Chemical data indicate that NB are not the protolith for any of the late Hercynian granites. Isotopic data (stable and radiogenic) also demonstrate that none of these granites derive from the melting of metasedimentary country rocks.
All the data are compatible with the assimilation hypothesis to explain the origin of cordierite bearing granites on a batholithic scale. The S-model (anatectic melting of metasediments) must be reconsidered or rejected.
An important finding has been the geochemical and isotopic difference (particularly in neodymium and strontium) between shales in Upper Precambrian Series and Lower Cambrian Series in the region studied. The former has a younger model age and a less granitic composition, suggesting a more mafic source area than sediments having an older model age.
A fluorination line for the determination of delta 18O in silicates was built. The fluorination line is now working in the Laboratory of the University of Salamanca.
The petrogenesis of cordierite granites is controversial despite their volumetric importance and association with mineral deposits. A multidisciplinary investigation of cordierite granites in Spain will test conflicting hypotheses, regarding the mechanism of cordierite genesis, through field, petrographic, mineral and whole-rock geochemical and isotopic techniques. A detailed assessment of the relative roles of mantle and crustal derived magma, fractional crystallization and crustal contamination, and the nature and source of associated fluids will allow construction of quantitative genetic models for both peraluminous granite petrogenesis and attendant mineralization. The results will have major implications both elsewhere in Europe and worlwide.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences earth and related environmental sciences geology petrology igneous petrology
- natural sciences chemical sciences inorganic chemistry alkaline earth metals
- engineering and technology environmental engineering mining and mineral processing
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Coordinator
37008 Salamanca
Spain
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