אסיף מאגר המחקר החקלאי

Overturned geopetal structures formed by solution of sulfates, Triassic (Rhaetian) Portoro limestone, Portovenere area (la Spezia), Liguria, Italy

Year:

1993

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Volume :

8

Co-Authors:

Folk, R.L., Department of Geological Sciences, University of Texas at Austin, Austin, 78713-7909, Texas, United States
Tiezzi, P.A., Department of Geological Sciences, University of Texas at Austin, Austin, 78713-7909, Texas, United States
Pursell, V.J., Department of Geological Sciences, University of Texas at Austin, Austin, 78713-7909, Texas, United States
Graber, E.R., Department of Geological Sciences, University of Texas at Austin, Austin, 78713-7909, Texas, United States
Greenberg, J.G., Department of Geological Sciences, University of Texas at Austin, Austin, 78713-7909, Texas, United States
Miller, J., Department of Geological Sciences, University of Texas at Austin, Austin, 78713-7909, Texas, United States

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Abstract:

The Triassic Portoro limestone of NW Italy contains four kinds of features that indicate the former presence of sulphates: (1) isolated single crystals now pseudomorphed by calcite; (2) nodules encrusted with large pseudomorphs on their surfaces; (3) single elliptical nodules (gnocchi); and (4) large amoeba-shaped masses (PAM's). All of these features show varying amounts of internal geopetal sediment accumulated during solution of the sulphate minerals. This sediment, now in the tops of the features, plays an important role in deciphering the complex structural geology by documenting tectonic overturning. The sulphates appear to be late diagenetic features, and their later dissolution was a consequence of fracturing during structural deformation. © 1993 Springer.

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