14.2.09

La surgència de Cal Cameta

Prop de Cal Cameta, al municipi de La Coma i la Pedra, apareix una surgència d'aigua en èpoques de pluges abundants. Aquesta submergeix un camp i forma un petit llac. El darrer cop que s'ha observat ha estat aquesta tardor. E. Soley ha facilitat unes imatges, moltes gràcies







Si s'observa la zona, juntament amb el mapa geològic, s'observa que hi passa una falla, concretament un encavalcament.

Aquest encavalcament posa en contacte calcàries micrítiques amb gresos i margues. Les calcaries micrítiques es troben per sobre, i són solubles amb l'aigua de la pluja, això fa que tinguin força cavitats i l'aigua hi penetri. Per altra banda els gresos i margues, situats per sota, són força impermeables, d'aquesta manera l'aigua que s'havia escolat per les calcàries de la serra no pugui seguir penetrant i hagi de sortir a l'exterior.

Els dipòsits de tartera que s'observen a les fotografies s'han generat a partir de la fracturació de les calcàries.



Imatge aèria de la zona de Cal Cameta. En verd les calcàries micrítiques, en blau el llac, en gris els dipòsits de tartera i en vermell l'encavalcament.


Perfil molt esquemàtic i sense escala del funcionament de la surgència.

8 comentaris:

Isaac Camps Gamundi ha dit...

Molt curiós. Fa venir ganes d'anar a veure-ho

Jaume ha dit...

Sí, i tant. A veure si aquesta primavera es pot tornar a veure-ho... Salut!

Anna ha dit...

si, quina passada de fotos!

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