Bellaluna-Member

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

• Sandhubel-Member

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)

• Silvretta
• Bernina-DK

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).