Bellaluna-Member

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Representation and status

Color CMYK
(0%,73%,81%,27%)
Color RGB
R: 185 G: 50 B: 35
Rank
lithostratigraphic Member (Subformation)
Validity
Unit is in Use
Status
informal term

Nomenclature

Deutsch
Bellaluna-Member
Français
Membre de Bellaluna
Italiano
Membro di Bellaluna
English
Bellaluna Member
Origin of the Name

Bellaluna (GR), Albulatal, 3 km SE Filisur

Historical Variants
Feldsteinporphyr (Theobald 1864 S.50), Bellalunaporphyr (Ott 1922), Bellaluna Member (Furrer et al. 1985), Quarzporphyr = Bellaluna-Member = Bellaluna-Metarhyolith (Furrer et al. 2015)

Description

Thickness
Max. 800 m an der Typlokalität ; 0-180 m in der Ducankette (Furrer et al. 1985).

Hierarchy and sequence

Units at roof

Age

Age at top
  • Early Permian
Age at base
  • Early Permian

Geography

Geographical extent
Albulatal, Ducankette.
Type area
Albulagebiet (GR) (Silvretta-Decke)

Palaenography and tectonic

Tectonic unit (resp. main category)
Kind of protolith
  • volcanic
Conditions of formation
Terrestrische Ablagerung von vulkanischer Effusiva und ihrer Verwitterungsprodukte.

References

Definition
Ott Emil (1922) : Zur Geologie des westlichen Bergünerstöcke (Piz Michèl und Piz Toissa) im Oberhalbstein und der südlichen Randzone Tinzen-Preda (Graubünden). Jahrbuch der philosoph. Fakultät II der Universität Bern II (1922), 113-125
Definition
Furrer Heinz (Ed.) (1985) : Field workshop on Triassic and Jurassic sediments in the Eastern Alps of Switzerland. Mitt. geol. Inst. ETH und Univ. Zürich (N.F.) 248, 81 S.

p.16: ... massive homogeneous layers of rhyolite and rhyodacites form the Bellaluna Mb. (800 m at Bellaluna in the Albula valley, 0-180 m in the Ducan chain).
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