Petrografía de inclusiones fluidas en espeleotemas: comparación con calcitas no espeleotémicas
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2016
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Sociedad Geológica de España.
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Abstract
Los espeleotemas presentan inclusiones fluidas que pueden utilizarse como proxy paleoclimático ya que sus características dependen de las condiciones físicoquímicas y ambientales bajo las que se generaron. En esta línea, su caracterización petrográfica aparece como una tarea fundamental, previa a cualquier otro tipo de análisis. En este trabajo se presenta el estudio petrográfico de las inclusiones fluidas de dos coladas de Cueva del Cobre (Palencia), que ha permitido clasificarlas en siete tipos en función de su morfología (thorn shaped, boudin shaped, elongate, amorphous, oval shaped, pyriform y round shaped). Todas ellas son monofásicas líquidas. Dependiendo del tipo de morfología de las inclusiones, su posición en relación al cristal encajante es variable, siendo las elongated y thorn shaped exclusivamente intercristalinas, y todas las demás intracristalinas. Un análisis comparativo con inclusiones descritas en calcitas no espeleotémicas revela que las inclusiones fluidas elongated, amorphous y oval shaped son también comunes en esas calcitas, mientras que las pyriform y las boudin shaped no han sido descritas hasta ahora.
Speleothems show fluid inclusions which can be used as paleoclimate proxy, as their features depend on the physicochemical and environmental conditions under which they were formed. In this line, their petrographic study arises as a fundamental task prior to any further analysis. This paper shows the petrographic study of the inclusions of two flowstones from Cueva del Cobre (Palencia), which has allowed the recognition of seven types of fluid inclusions according to their morphology (thorn shaped, boudin shaped, elongate, amorphous, oval shaped, pyriform and round shaped), all of them monophasic. It should be noted that elongated and thorn-shape inclusions are exclusively intercrystalline, and the others are intracrystalline. A comparative analysis of these inclusions with those described in non-speleothemic calcites reveals that elongated, amorphous, and oval shaped morphologies are also common in those calcites, but pyriform and boudin shaped inclusions have been never described in previous works.
Speleothems show fluid inclusions which can be used as paleoclimate proxy, as their features depend on the physicochemical and environmental conditions under which they were formed. In this line, their petrographic study arises as a fundamental task prior to any further analysis. This paper shows the petrographic study of the inclusions of two flowstones from Cueva del Cobre (Palencia), which has allowed the recognition of seven types of fluid inclusions according to their morphology (thorn shaped, boudin shaped, elongate, amorphous, oval shaped, pyriform and round shaped), all of them monophasic. It should be noted that elongated and thorn-shape inclusions are exclusively intercrystalline, and the others are intracrystalline. A comparative analysis of these inclusions with those described in non-speleothemic calcites reveals that elongated, amorphous, and oval shaped morphologies are also common in those calcites, but pyriform and boudin shaped inclusions have been never described in previous works.