Marmo di Sevinèra
Zurück zu Gruppo d'AntabiaDarstellung und Status
- Farbe CMYK
- (28%,7%,0%,10%)
- Farbe RGB
- R: 165 G: 215 B: 230
- Rang
- lithostratigraphische Formation
- Gebrauch
- Element ist in Gebrauch
- Status
- informeller Begriff
Nomenklatur
- Deutsch
- Sevinèra-Marmor
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- Marbre de Sevinèra
- Italiano
- Marmo di Sevinèra
- English
- Sevinèra Marble
- Herkunft des Namens
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Alpe di Sevinèra (TI), E Campo (Val Bavona)
- Historische Varianten
- Sevinèra marble (Matasci et al. 2011 p.262), Upper Jurassic marble
Beschreibung
- Mächtigkeit
- Bis zu 30 m (Matasci et al. 2011).
Hierarchie und Abfolge
- Untergeordnete Einheiten
- Hangendes
- Liegendes
Alter
- Alter Top
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- Tithonien
- Alter Basis
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- Oxfordien
Geografie
- Geographische Verbreitung
- Lepontin: Val Bavona.
Paläogeografie und Tektonik
- Tektonische Einheit (bzw. Überbegriff)
- Herkunftstyp
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- sedimentär
- Metamorphose
- monozyklisch
Referenzen
- Erstdefinition
-
2011) :
The Teggiolo zone: a key to the Helvetic–Penninic connection (stratigraphy and tectonics in the Val Bavona, Ticino, Central Alps). Swiss J. Geosci. 104, 257–283
p.262: 3.3.4 The Sevinèra marble
Calcitic marbles are a conspicuous constituent of the Teggiolo zone, although their distribution is discontinuous because they frequently disappear by erosion below the base of the third sedimentary cycle. They are well exposed on both banks of Val Bavona where their thickness can reach 30 m. Their lower limit with the Sevinèra sandstone is sharp. As they make nice outcrops at the same locality we call this marble formation the Sevinèra marble. It shows a gradual vertical evolution in composition and aspect and can conveniently be subdivided into two members:
1. The lower part has a characteristic yellowish to brownish color (‘‘yellow member’’). The base of this member is banded and consists in an alternation of cm or dm-thick beds of slightly impure limestones (10–20% of fine-grained quartz, feldspar, mica and dolomite), with more impure and more coarsely quartzic and micaceous limestones or calcschists (Fig. 3). It passes very progressively upwards, by attenuation of the bedding and increasing purity, to a more homogenous and massive, still yellowish limestone. The protolith of this sequence must have been an alternation of beds of more or less argillaceous limestones and marls, with decreasing upwards content in clay minerals and other fine-grained detritals.
2. The upper part is a very pure limestone (98% calcite). It is massive, homogeneous and white (‘‘white member’’).
(
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White Member
- Rang
- lithostratigraphisches Member (Subformation)
- Status
- inkorrekter Begriff (jedoch informell gebraucht)
- Kurzbeschreibung
- Marbre calcaire très pur, blanc et massif, de la partie supérieure des Marbres de Sevinèra.
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Yellow Member
- Rang
- lithostratigraphisches Member (Subformation)
- Status
- inkorrekter Begriff (jedoch informell gebraucht)
- Kurzbeschreibung
- Alternance centimétrique à décimétrique (aspect rubané) de marbre légèrement impur et de calcaire quartzeux et micacé ou de calcschiste. La série devient plus massive vers le haut.