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Uruguay geology contributions no. 4; Contribuciones a la geologia del Uruguay no. 4

Miscellaneous:

Abstract

Sedimentary facies: the metasiltites and mela sandstones develop granoblastic textures. The present lepidoblastic textures in flexured bands of seri cite and/or chlorite, a fine qranoblastic matrix made by quartz-feldespaths. The carbonates develop mosaic textures with big crystals of calcites and dolomite, generally elongated following metamorphic foliation (seri cite/chlorite). The quartzites develop qranoblastic textures, with few minerals. Volcanics facies: the basic volcanics presents doleritic intersect al textural, that exist saussuritized plagioclase and albitic diabasa with diopside-augite beaches. Usually the pyroxenes develop poiquilitic textural. Present amphiboles of the acti note series and frequently sphene. Others basic rocks are microlitio porfiric, in intersect al or fluidal matrix, with albite microliters in epi dote-chlorite-acti note criploerislalline ground.The stability relationships of the diferents types of basic metavulcanites show low metamorphic facies, with temperatures under 530-550 grades C, being the most Irequenl association: albite+actinote+chlorite+epidote+opaques- opaques.The clastic faciest are integrated by monogenic breccia with elements of varied vulcanites and porfiric rnicrolitic texture. The matrix is made of line quartz and epidote aggregate. The basic volcanism present hyalo-porfiric textures with saussuritized plagiodase pheno crystals, and quartz in a micro lo criptocrystalline ground. Were also defined rocks with porfiric texture in a piromeritic ground as well as rocks with  More>>
Authors:
Preciozzi, F [1] 
  1. Ministerio de Industria Energia y Mineria, Direccion Nacional de Mineria y Geologia, Montevideo (Uruguay)
Publication Date:
Jul 01, 1989
Product Type:
Miscellaneous
Report Number:
INIS-UY-538
Subject:
58 GEOSCIENCES; AMPHIBOLE; ANORTHOSITES; CALCITE; CARBONATES; CRYSTALS; DIOPSIDE; DOLOMITE; FELDSPARS; GEOLOGY; METAMORPHISM; ORIGIN; QUARTZ; QUARTZITES; SANDSTONES; SCHISTS; TITANITE; URUGUAY; VOLCANISM; CARBON COMPOUNDS; CARBONATE MINERALS; DEVELOPING COUNTRIES; GABBROS; IGNEOUS ROCKS; LATIN AMERICA; METAMORPHIC ROCKS; MINERALS; OXIDE MINERALS; OXYGEN COMPOUNDS; PLUTONIC ROCKS; ROCKS; SEDIMENTARY ROCKS; SILICATE MINERALS; SOUTH AMERICA
OSTI ID:
21575235
Research Organizations:
Ministerio de Industria Energia y Mineria, Direccion Nacional de Mineria y Geologia, Montevideo (Uruguay)
Country of Origin:
Uruguay
Language:
Spanish
Other Identifying Numbers:
TRN: UY1200035052940
Availability:
Available from INIS in electronic form
Submitting Site:
INIS
Size:
15 pages
Announcement Date:
Jul 26, 2012

Miscellaneous:

Citation Formats

Preciozzi, F. Uruguay geology contributions no. 4; Contribuciones a la geologia del Uruguay no. 4. Uruguay: N. p., 1989. Web.
Preciozzi, F. Uruguay geology contributions no. 4; Contribuciones a la geologia del Uruguay no. 4. Uruguay.
Preciozzi, F. 1989. "Uruguay geology contributions no. 4; Contribuciones a la geologia del Uruguay no. 4." Uruguay.
@misc{etde_21575235,
title = {Uruguay geology contributions no. 4; Contribuciones a la geologia del Uruguay no. 4}
author = {Preciozzi, F}
abstractNote = {Sedimentary facies: the metasiltites and mela sandstones develop granoblastic textures. The present lepidoblastic textures in flexured bands of seri cite and/or chlorite, a fine qranoblastic matrix made by quartz-feldespaths. The carbonates develop mosaic textures with big crystals of calcites and dolomite, generally elongated following metamorphic foliation (seri cite/chlorite). The quartzites develop qranoblastic textures, with few minerals. Volcanics facies: the basic volcanics presents doleritic intersect al textural, that exist saussuritized plagioclase and albitic diabasa with diopside-augite beaches. Usually the pyroxenes develop poiquilitic textural. Present amphiboles of the acti note series and frequently sphene. Others basic rocks are microlitio porfiric, in intersect al or fluidal matrix, with albite microliters in epi dote-chlorite-acti note criploerislalline ground.The stability relationships of the diferents types of basic metavulcanites show low metamorphic facies, with temperatures under 530-550 grades C, being the most Irequenl association: albite+actinote+chlorite+epidote+opaques- opaques.The clastic faciest are integrated by monogenic breccia with elements of varied vulcanites and porfiric rnicrolitic texture. The matrix is made of line quartz and epidote aggregate. The basic volcanism present hyalo-porfiric textures with saussuritized plagiodase pheno crystals, and quartz in a micro lo criptocrystalline ground. Were also defined rocks with porfiric texture in a piromeritic ground as well as rocks with vacuolar microlitic texture.The clastic facies are made by breccias with sharp elements, with rare cement, integrated by pyroclastic products, The volcanics rocks present retrometamorphism of the phenocrystals and devitrification. The plagioclase are traslormated in fine aggregates of albite epidote. The regional metamorphism minerals are represented by the para genesis: quartz+albite+chlorite+epidote+(seri cite-actinole), subfacies quartz albite-chlorite of the green schist facies.}
place = {Uruguay}
year = {1989}
month = {Jul}
}