GRANITES_V3

8/3/2019 GRANITES_V3

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PSEUDOKARST INGRANITES

Juan Ramn Vidal-Roman, IUX

Marcos Vaqueiro-Rodriguez, CEMPresentation for Vercors 2008


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Caves developed along majorfracture planes

O Forno Cave, Castelo da Furna (Valena, Portugal) and A CunchosaSystem, Aldn (Pontevedra, Spain).


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O F o

l n

C a v e

P a s s a g e s

d e v e l o p e

d a l o n g

t h e m a i n

f a u l t p

l a n e .

( P o n

t e v e d r a ,

S p a i n

)


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Caves developed along major fracture planesO Foln System (Vigo, Pontevedra-Spain) has beendeveloped taking advantage of the discontinuity system of the granite rock massif. The water circulation in the area isunderground at present. The formation of this cave is older than Quaternary and would start after the development of

the surface +120 m.a.s.l., whose chronology we may assignto the Pliocene approximately.The cavity has a vertical development of 34 m from theterrain surface. The total length of the galleries is 905 m of which about 235 m are normally occupied by water.


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To the left: O Foln Cave: Evolution model from Plio-Pleistocene tothe present.Pictures: Passage morphomolgies in Portugal (at the top), and fossil

phreatic conduits in O Folon (at the bottom).


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Present stage

From 1,8 kyr B.P.

Regressive sequence fot the evolution of cave: O Foln System

When different paleo-flow levels have been determined, they can berelated to the structure. A complete and complex geomorphologicalwork and the use of different methods for datation (C14,luminiscence,), permit us to approach a regressive sequence for the

evolution of cave.


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Paleolevel L4

5,5 kyr B.P.



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Paleolevel L3



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Paleolevel L2



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Paleolevel L1



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At the end of the Plio-Quaternary

Paleolevel L0



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Caves associated with residual

blockfields

Cova da Becha Cave (Dragon's Cave), Serra do Galieiro (Pontevedra,Spain) and Coto dos Namorados Cave, Ponteareas (Pontevedra,Spain).


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Tafone caves

Prehistoric pictures located inside a tafone cave, Los Barruecos de Malpartida (Cceres, Spain)


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Coto da Moura: Tafone cave, Serra do Galieiro (Pontevedra, Spain)


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Tafone, O Pindo (A Corua, Spain)


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Tafone, Outeiro das Campanas (Pontevedra, Spain)


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Tafone caves, type lapa. A Touba do Brin Cave, Serra doGalieiro (Pontevedra, Spain)


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Neolithic mills and millstone inside a tafone cave, Serra do Galieiro (Pontevedra, Spain)


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NATURAL, ARCHAEOLOGICAL AND GEOLOGICALHERITAGE RELATED TO GRANITE CAVES


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Natural heritage* Root stalagmites* Chioglossa lusitanica* Alites obstetricans* Schistostega pennata

Chioglossa lusitanica, protected by Directive 92/43/CEE.


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Opal-A Speleothemes

Biogenical opal stalactites. O Forno, Castelo da Furna (Valena, Portugal)


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FOSIL D.N.A. INSIDEBIOGENICAL OPAL SPELEOTHEMES

Fotos: J.R.Vidal-Roman, Instituto Universitario de Xeoloxa Isidro Parga Pondal, Universidade de A Corua


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Pigotite Speleothemes

Flowstone and dripstone located in Pozo da R Cave, O Foln System, Vigo (Pontevedra, Spain)


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Flowstone located in Coral Roxo Cave, O Foln System, Vigo (Pontevedra, Spain)



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Flowstone located in A Trapa System, Ribadelouro (Pontevedra, Spain)



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Archaeological heritage

Findings are mainly from Neolithic Age, Coper and Bronze Age.

In O Foln System there is about 56 beds witharchaeological remains.


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Archaeological heritage

To the left, prehistoric and Medieval engraved pictures. To theright, at the top, a Copper Age ceramic piece from O FolnSystem. To the right, at the bottom a Medieval buckle from

Portugal.


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Troglodite chapels

Many troglodite chapel have been built inside granitecaves.At the top Capilla de la

Asuncin built in the XXcentury.To the left, two pictures fromSan Pedro de Rocas, Esgos(Ourense, Spain): First it wasan hermitage cave,transformed in a chapel andmonastery during the LowMedieval Age.


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Thank you for your attention!

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