Formazione di Ternate

Torna a Formazione di Brenno

Rappresentazione e statuto

Colore CMYK
(0%,21%,90%,6%)
Colore RGB
R: 240 G: 190 B: 25
Rango
Formazione litostratigrafica
Uso
Unità in uso.
Status
valido

Nomenclatura

Deutsch
Ternate-Formation
Français
Formation de Ternate
Italiano
Formazione di Ternate
English
Ternate Formation
Origine del nome

Ternate (Italia)

Varianti storiche

Obereozän von Travedona-Ternate, ... (Herb 1976, Bernoulli 1980, Bernoulli et al. 1988, Mancin et al. 2001), Ternate Formation (Bernoulli et al. 1988), Formazione di Ternate (Bernoulli et al. 2018)

Descrizione

Descrizione

Geröllpetrographie: spiculitische Kalke und Mergelkalke (Lias), Scaglia Lombarda, Tertiäre hemipelagische Mergel, sowie Trias-Dolomiten, Radiolariten, Maiolica und Oberkreide-Flysch.

Potenza
Ca. 150 m.

Componenti

Fossili
  • nummuliti
  • alghe
  • molluschi
  • foraminferi
  • briozoari

Gerarchia e successione

Unità sovrastante
Unità sottostante
Limite superiore

Gerölle der Ternate-Fm. in den oligozänen marinen Konglomeraten zwichen Como und dem Lago Maggiore (Gunzenhauser).

Limite inferiore

Aufarbeitung der liegenden Einheiten (inkl. des frühen und mittleren Eozäns).

Età

Geomorfologia
  • Priaboniano
Età alla base
  • Priaboniano
Metodo di datazione

Planktonische und benthonische Foraminiferen des späten Eozäns.

Geografia

Estensione geografica
Ternate - Travedona.
Punti d'interesse

Paleogeografia e tettonica

Termini generici
Tipo di origine
  • sedimentaria

Referenze

Revisione
Bernoulli Daniel, Herb René, Grünig Angela (1988) : The Ternate Formation, a Late Eocene bioclastic submarine fan of the Lombardian Basin (Southern Alps). AAPG Mediterranean Basins Conference (Nice)

The Ternate Formation consists of some 150 m of redeposited bioclastic limestones, channelized rubble beds, and pebbly mudstones and subordinate hemipelagic marls with a late Eocene fauna of planktonic Foraminifera (Globorotalia cerroazulensis cerroazulensis Zone). Parallel-bedded massive or graded bioclastic limestones are overlain by channelized deposits. Large channels are up to 12 m deep; some contain pebbly mudstones with large slabs and boulders of older marls and limestones in a matrix of middle Eocene marls. More typically, the channels are filled by pebbly calcirudites grading into calcarenites and laterally wedging out over very short distances. Interchannel deposits are thin-bedded, graded calcarenites and thin green marls. The bioclastic limestones contain mainly coralline algae, larger Foraminifera (nummulitids, Discocyclina), bryozoans, echinoderms, and other shallow-water biota. All lithic fragments are of local, south-Alpine origin. By far the most abundant are spiculitic limestones and marls of Liassic age and Upper Cretaceous to middle Eocene limestones and marls. Most of the redeposited calcareous sand and gravel was deposited in ephemeral channels which cut across each other in a very complex way and were briefly active. This depositional system matches the suprafan environment of a prograding submarine fan of low transport efficiency. The facies of the conglomerates, the local source of the lithic fragments, and comparison with other lower Tertiary bioclastic deep-water deposits suggest short transport and deposition in one (or a series) of local bioclastic submarine fans. The benthic Foraminifera associated with the hemipelagic marls indicate deposition in the upper bathyal zone (600-1,000 m).
zum Anfang der Seite