Calcite veins of the Stripa granite (Sweden) as records of the origin of the groundwaters and their interactions with the granitic body

Details Calcite veins of the Stripa granite (Sweden) as records of the origin of the groundwaters and their interactions with the granitic body Calcite veins of the Stripa granite (Sweden) as records of the origin of the groundwaters and their interactions with the granitic body

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1777c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 8, pp.1777-1781

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Scientific paper

A Sr isotopic study combined with stable isotope determinations ( 18 O and 13 C ), petrographic observations and speciation calculations suggests that the Stripa granite (Sweden) contains at least three different types of calcite veins. One type with 18 O = -18 to -24%. (PDB) and 87 Sr / 86 Sr = 0.7814 to 1.0696 probably formed at temperatures above 200°C, together with chlorite and epidote, during one or two metamorphic events which are recorded in the Rb-Sr systematics of some minerals of the granite at 1.4 and 0.8 Ga. Another type with 18 O = -12 to -18%. (PDB) and 87 Sr / 86 Sr = 0.7406 to 0.7536 and mainly associated with chlorite, is most likely in equilibrium with the presentday groundwaters, which probably have reacted with the fracture minerals of the granitic body for a long time without any supply of external fluids. The third type of calcite with 18 O = -12 to -18%. (PDB), 13 C = -5 to -45%. (PDB) and 87 Sr / 86 Sr = 0.7266 to 0.7406, could have formed from reactions involving methane oxidation or sulphate reduction in the presence of bacteria.

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