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

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(89)90298-6· OSTI ID:7079404

Clauer, N; Fritz, B ^[1]; Frape, S K ^[2]

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1. Centre de Sedimentologie et de Geochimie de la Surface (CNRS), Strasbourg (France)
2. Univ. of Waterloo, Ontario (Canada)

A Sr isotopic study combined with stable isotope determinations ({delta}{sup 18}O and {delta}{sup 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 {delta}{sup 18}O = {minus}18 to {minus}24{per thousand} (PDB) and {sup 87}Sr/{sup 86}Sr = 0.7814 to 1.0696 probably formed at temperatures above 200{degree}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 {delta}{sup 18}O = {minus}12 to {minus}18{per thousand} (PDB) and {sup 87}Sr/{sup 86}Sr = 0.7406 to 0.7536 and mainly associated with chlorite, is most likely in equilibrium with the present day ground waters, 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 {delta}{sup 18}C = {minus}12 to {minus}18{per thousand} (PDB), {delta}{sup 13}C = {minus}5 to {minus}45{per thousand} (PDB) and {sup 87}Sr/{sup 86}Sr = 0.7266 to 0.7406, could have formed from reactions involving methane oxidation or sulfate reduction in the presence of bacteria.

• OSTI ID: 7079404
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Journal Name: Geochimica et Cosmochimica Acta; (USA) Vol. 53:8; ISSN GCACA; ISSN 0016-7037
• Country of Publication: United States
• Language: English

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