16 documents found, page 1 of 2

Evolution of a Neoproterozoic suture in the Iberian Massif, Central Portugal: i...

ABSTRACT: The existence of the late Neoproterozoic supercontinent Pannotia (ca. 650-540 Ma) is controversial. Several proxies for supercontinent assembly and break-up have been recognized. Global orogeny and granitoid magmatism, detrital zircon and monazite age peaks and extreme conditions of metamorphism are some of the proxies pointed out for supercontinent assembly. The amalgamation of Pannotia was accompani...

Evolution of a Neoproterozoic suture in the Iberian Massif, Central Portugal: i...

ABSTRACT: The existence of the late Neoproterozoic supercontinent Pannotia (ca. 650-540 Ma) is controversial. Several proxies for supercontinent assembly and break-up have been recognized. Global orogeny and granitoid magmatism, detrital zircon and monazite age peaks and extreme conditions of metamorphism are some of the proxies pointed out for supercontinent assembly. The amalgamation of Pannotia was accompani...

Geochemistry and metamorphism of the Mouriscas Complex, Ossa-Morena/Central Ibe...

ABSTRACT: The Mouriscas Complex is a deformed and metamorphosed predominantly mafic igneous complex of Ediacaran and Ordovician age and crops out at the Ossa-Morena/Central Iberian zone boundary in the Iberian Massif, Central Portugal. It comprises amphibolite with Neoproterozoic protoliths (ca. 544 Ma), protomylonitic felsic dykes derived from younger trondhjemitic protoliths (ca. 483 Ma) and garnet amphibolit...

Cadomian magmatism and metamorphism at the Ossa Morena/Central Iberian zone bou...

ABSTRACT: A well preserved Cadomian basement is exposed in the Iberian Massif, Central Portugal, at the Ossa Morena/Central Iberian zone boundary, which allows the determination of reliable geochemical data. A sequence of Cadomian and Variscan magmatic and tectonometamorphic events has been already described for this area and are documented in other areas of the Avalonian-Cadomian orogen. However, the geochemic...

Petrogenesis of a late-Variscan rhyodacite at the Ossa Morena-Central Iberian z...

ABSTRACT: A late-Variscan rhyodacite is exposed at the contact between the Ossa Morena Zone and the Central Iberian Zone of the Iberian Massif, Central Portugal. Dykes of rhyodacite intruded the Serie Negra Unit and the Sardoal Complex that are part of the Cadomian basement. The igneous crystallization age of the rhyodacite (308 +/- 1 Ma) was obtained on igneous monazite by the ID-TIMS U-Pb method. It is broadl...

Erratum: Corrigendum to “Evolution of a Neoproterozoic suture in the Iberian Ma...

Evolution of a Neoproterozoic suture in the Iberian Massif, Central Portugal: N...

ABSTRACT: A Neoproterozoic suture is exposed at the contact between the Ossa Morena Zone and the Central Iberian Zone, in the Iberian Massif (Central Portugal), the westernmost segment of the European Variscides. Although, the Cadomian magmatic and tectonometamorphic events have been previously documented, their timing is still poorly constrained, particularly in the inner zones of the suture. We used geochrono...

Neoproterozoic magmatism and metamorphism at the northern margin of Gondwana : ...

P-T evolution of Neoproterozoic and Ordovician metamorphic rocks in the Iberian...

Island-Arc signature in amphibolites from the boundary between the Ossa Morena ...