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| Titel |
MINERALOGICAL DESCRIPTION OF THE SKARN FROM MRACONIA VALLEY, ALMAJ MOUNTAINS, ROMANIA |
| VerfasserIn |
Maria Angela Anason, Stefan Marincea, Dumitras Delia Georgeta |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250086711
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| Publikation (Nr.) |
 EGU/EGU2014-628.pdf |
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| Zusammenfassung |
| The purpose of this paper is to update knowledge of the investegated area. The research are overlaps of the hidrographic basin of the Mraconia Valley, at north is bounded by the alignment Poiana Mraconia and Lugojistea; at east by the Satului Valley; souther limit is constitutes by the Ponicova Valley and the western limit is Cracul Radului-Cracul Urzicea.
The skarn was described for the first time in the 1934 by the A. Streckeisan with the name Catramat Series; this series was a kata-mezonal character, which is the debris of an old canvas with Upper Carbonifer age. The crystalline schist of the Poiana Mraconia Series, are studied by Al. Codarcea, I. Bercia, E. Bercia (1934) and suffered a progressive metamorphism in the amphibolites with alamandine facies and the disten-alamandine-muscovite subfacies, together revealed the metapelithe paragenesis including disten, green hornblende, andezine and alamandine.The primar metamorphism were followed to the regressive metamorphism by the Assyntic orogene and Varisc cycles (I. Bercia, E. Bercia, 1975). Petrografically exceed the amphibolites paragnaice and the micacee paragnaice, with biotite and garnet, associated with the quartz-feldspar gneiss and feldspar quartzite, affected by the arthritic migmatization. Fine grain, sharp sistuozity, the muscovite are frequent and the pegmatite absence leading to the Poiana Mraconia crystalline differentiation by the Ielova crystalline, bud both are included in the Almaj complex. Mineralogical and petrographic study of the Mraconia skarns serves in predicting the relations between the magmatite form the upper basin of the valley (with the mineralization of the W and Mo), and the adjacent formations. This paper wants to emphasize the next petrographic types following: 1. the micacee paragnais are characterized by the existing of the quartz, plagioclase, microcline, muscovite, biotite, chlorite and epidote; 2. The micacee paragnais with garnet are definite by the paragenisis: quartz, plagioclase, muscovite, biotite, chlorite, garnet, ruthile and zircon; 3. The amphibolites are characterized by the paragenesis : hornblende, plagioclase, biotite, chlorite, quartz, epidote, calcite sometimes sphene, apatite and pyrite. They are rocks with oriented texture, sometimes rubanated and nano-nemathoblastics structure.The methasomatite from Mraconia perimetre are represented by pseudoskarn after Korjinski (1968), the mineralas paragenesis show the evolution of the skarn, from skarn senso-stricto to pseudoskarn due the hydrothermal contribution.
References:
BERCIA I., BERCIA ELVIRA (1975): The crystalline of the Danube domain from the Banat (Rom-nia). Rev. Roum. Geol. Geoph.Geogr.serie Geologie 24., Bucureşti.
CODARCEA AL. (1934): Note sur la structure geologique et petrographique de la region Ogradena - Svinita. C.R. Inst. Geol. Roum., XXI, Bucuresti.
KORJINSI D.S., (1968) : The teory of metasomatic zoning. Min. Dep. 3, Berlin.
STRECKEISEN A., (1934): Sur la tectonique des Carpathes Meridionales. An. Inst. Geol. Rom. XVI, Bucureşti. |
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