Palaeomagnetism of Lower Ordovician and Upper Precambrian Rocks from Argentina
نویسندگان
چکیده
منابع مشابه
Advancing Precambrian palaeomagnetism with the PALEOMAGIA and PINT(QPI) databases
State-of-the-art measurements of the direction and intensity of Earth's ancient magnetic field have made important contributions to our understanding of the geology and palaeogeography of Precambrian Earth. The PALEOMAGIA and PINT(QPI) databases provide thorough public collections of important palaeomagnetic data of this kind. They comprise more than 4,100 observations in total and have been es...
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In order to obtain a Lower Palaeozoic pole for the Armorican Massif and to test the origin of the Ibero-Armorican arc, the Ordovician dolerites of the Crozon peninsula have been palaeomagnetically studied. The samples show a multicomponent magnetization which has been revealed by AF and thermal demagnetization and thoroughly investigated with rock magnetic experiments, polished section examinat...
متن کاملPrecambrian Rocks of the Tusas Mountains
INTRODUCTION Precambrian rocks in the Tusas Mountains range from nearly monomineralic quartzite, in which the principal result of metamorphism has been simple recrystallization, through locally metasomatized schist and gneiss profoundly modified by potash-rich fluids during the intrusion of pegmatite. Texturally, the rocks range from schist and phyllite containing penetrative and pervasive clea...
متن کاملHigh-resolution correlation in apparently monotonous rocks: upper Ordovician Kope Formation, Cincinnati Arch.
Short stratigraphic sections in apparently monotonous strata pose several challenges to high-resolution (<l m) correlation. A lack of distinctive marker horizons can prevent obvious visual correlations between the sections. The stratigraphic shortness of the outcrops further reduces the likelihood of any given section having a recognizable marker horizon. The Upper Ordovician Kope Formation of ...
متن کاملTHE OCCURRENCE OF THE BLUE-GREEN ALGA Girvanella IN THE LOWER ORDOVICIAN OF PRECORDILLERAN ARGENTINA
The occurrence of the blue-green alga Girvanella, reported for the first time in the Ordovician rocks of South America (Precordilleran Ar gentina), allows the completion of the pattern of horizontal distribution of this organism in relation to the palaeobiogeography of the Lower Ordovi cian.
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ژورنال
عنوان ژورنال: Journal of geomagnetism and geoelectricity
سال: 1980
ISSN: 0022-1392
DOI: 10.5636/jgg.32.supplement3_siii71