Physics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pepi...35..121p&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 35, Issue 1-3, p. 121-130.
Physics
9
Scientific paper
The abundant granitoids in the Palaeozoic basement of the northwestern Iberian Peninsula include 470-440 Ma old suites (Early-Middle Ordovician, now present as orthogneisses) and several Variscan suites. The age data presently available suggest that the latter have been generated in three separate time intervals, ~ 330-320 Ma ago (Late Visean-Early Namurian), ~ 310-300 Ma ago (Westphalian) and ~ 290-280 Ma ago (Late Stephanian-Autunian). Rb-Sr whole-rock and U-Pb zircon systematics, along with field and chemical evidence, testify to the generation of the Early and Late Palaeozoic granitoids from Lower Palaeozoic and Precambrian (maximum age ~ 1.7-1.6 Ga) sedimentary sequences, respectively. The source rocks contained zircons derived from a late Archaean-Early Proterozoic continental crust that probably underlies the whole of western Europe, although for the greater part modified beyond recognition by younger crustal reworking.
den Tex Emile
Priem Harry N. A.
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