AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA GEOLOGIA - Ediţia nr.2 din 2010 | |||||||
Articol: |
MINERALOGY OF SPELEOTHEMS FROM FOUR CAVES IN THE PURCĂREŢ - BOIU MARE PLATEAU AND THE BAIA MARE DEPRESSION (NW ROMANIA). Autori: TUDOR TĂMAŞ. |
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Rezumat: The Purcăreţ - Boiu Mare Plateau and the southern edge of the Baia
Mare Depression, in Sălaj and Maramureş Counties, NW Romania, host over 200
caves located in limestones ranging in age from Upper Eocene to Badenian. The
carbonate rocks are interposed with non-karst rocks consisting of shales,
sandstones and marls. Four caves hosted by limestones of different lithologies
have been investigated for secondary minerals in the composition of their
speleothems. Calcite, gypsum, goethite, jarosite, brushite, hydroxylapatite and
taranakite were found in the composition of crusts, crystals, aggregates and
earthy masses. The mineral association was characterized by means of X-ray
diffraction and scanning electron microscopy. Gypsum, goethite and jarosite resulted
from sulfide oxidation, whereas the phosphate associations formed through the
interaction of phosphoric acid from bat guano with the limestones and detrital
sediments. In Lii Cave, hydroxylapatite was also identified in black crusts
deposited on fossil rib fragments within the limestones. |
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