| Autor: |
Aso, E., Gisbert, T., Garcés, B. |
| Zdroj: |
Carbonates & Evaporites; Sep1992, Vol. 7 Issue 2, p132-139, 8p |
| Abstrakt: |
We have studied three nodules of Stephano-Permian age in the Spanish Pyrenees. These are associated with lacustrine limestone. We have determined three standard types of nodules which are described by petrographic, cathodoluminescence and ultramicroscopic techniques and carbonate composition (Edax analysis). The nodules have cumules of calcite fibres with cone in cone or fibrous-radial arrangements. Also there are septaria cracks. We dispute the nodule, septaria and cone in cone formation and suggest a development due to layering of organic gel segregated by microorganisms. We also propose a concrete meaning for the terms: Beef, feather-like cone in cone, arborescent cone in cone, card house cone in cone and planar septaria. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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