Publication details
Variscan veins: record of fluid circulation and Variscan tectonothermal events in Upper Palaeozoic limestones of the Moravian Karst, Czech Republic
| Authors | |
|---|---|
| Year of publication | 2006 |
| Type | Article in Periodical |
| Magazine / Source | Geological Magazine |
| MU Faculty or unit | |
| Citation | |
| Field | Geology and mineralogy |
| Keywords | Palaeozoic; calcite veins; syntectonic processes; fluid dynamics |
| Description | Numerous Variscan syntectonic calcite veins crosscut Palaeozoic rocks in the Moravian Karst. The isotopic signatures point to precipitation in an older fluid system buffered by the host rock (white calcites) and to an open, younger fluid dominated system (rose calcites). Parent fluids (H2O-NaCl system) had salinities between 0.35 and 17.25 eq. wt% NaCl and temperature between 120 and 170C, a pressure of 300-880 bar at a depth between 2.1 and 3.2 km. The fluids were most likely confined to a particular sedimentary bed as a bed-scale fluid migration. The low temperatures and pressures during precipitation of calcites, which took place close to a peak of burial/deformation, confirm the distal position of the Moravian Karst region within the Variscan orogen. |
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