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93.842  Articles
1 of 9.385 pages  |  10  records  |  more records»
Triassic-Jurassic volcano-sedimentary sequences in the Coastal Range of central Chile (34° 45/35°20'S) from the Vichuquén-Tilicura and Hualañé-Gualleco basins display metamorphic assemblages indicative of very low-grade conditions. Triassic and Lower Jura... see more

A metamorphic assemblage of very low grade metamorphism in Paleogene volcanic rocks from the Andesitic Formation, Confluencia, Neuquén Province, is studied. The protolith is basaltic and andesitic. The secondary minerals are calcic, calcosodic and sodic z... see more

ABSTRACT. Rocks belonging to various units from the Jurassic to the Neogene were studied in the Chilean Patagonian area between 43 and 46°S. AII these rocks were affected by very low to low grade metamorphism in the zeolite, prehnitepumpellyite and greens... see more

ABSTRACT. Investigation of the crystallinity of K-white micas in early Permian rocks from the Nambucca Block, NSW, reveals a metamorphic pattern with the highest grade (epizonal) rocks in an east-west trending zone which changes transitionally to lower gr... see more

The thermal post-depositional evolution of metapelitic and metavolcanic rocks of the upper Cambrian-Ordovician succession in the Central Andes of northwestern Argentina, was estimated through X ray diffraction of clay mineral analysis, Kübler Index (KI), ... see more

Five new SHRIMP U-Pb zircon ages are reported for gneisses and foliated plutonic rocks belonging to the Tierra del Fuego igneous and metamorphic basement complex (TFIMC), obtained from the bottom of borehole cores through the Magallanes Basin. Three ofthe... see more

The metamorphic P-T conditions of low-grade units from the Famatina belt, Central Andes of Ar¬gentina, were estimated through petrography, X-ray diffraction, and electron microscopy. For the Middle-Upper Cambrian Negro Peinado Formation a tectono-metamorp... see more

Many of the metamorphic and deformational events associated to low-grade units in NW Argentina have been linked with ancient orogenies, like the Pampean (Cambrian) and the Ocloyic (Ordovician) cycles. The lack of specific ages in the low-grade metamorphic... see more

The purpose of this study was to obtain objective information and clarity regarding Elementary School Teacher Competitions through Low grade Portfolio Assessment. The results of this study indicated that the development of thematic learning models through... see more

1 of 9.385 pages  |  10  records  |  more records»