Seconda Zona Dioritico-Kinzigitica

Representation and status

Index

2DK / IIDK

Color CMYK

(0%,0%,0%,100%)

Color RGB

R: 250 G: 210 B: 210

Rank

tectonically bounded lithostratigraphic unit

Validity

Unit is in Use

Status

incorrect name (though informally used)

Nomenclature

Deutsch

Seconda Zona Dioritico-Kinzigitica

Français

Seconde Zone Dioritico-Kinzigitique

Italiano

Seconda Zona Dioritico-Kinzigitica

English

Second Dioritic-Kinzigitic Zone

Origin of the Name

Ressemblance avec la "(Prima) Zona Diorito-Kinzigitica" (= Zona di Ivrea-Verbano).

Historical Variants

seconda zona dioritica (Gerlach) = zona Val Mastellone-Val Sesia (Bearth), seconde zone dioritique (Henny 1918), II Zona Diorito-Kinzigitica (Carraro et al. 1970, Minnigh 1977), II Zona Diorito-kinzigitica (Dal Piaz et al. 1971), Klippen of the Ivrea-Valpelline complex on the Sesia-Lanzo zone = IIDK (Dal Piaz et al. 1973), Seconda Zona Dioritico-Kinzigitica (Compagnoni et al. 1977), II Zona diorito kinzigitica (Stütnitz 1989), II Zona diorito kinzigitica = 2a Zona diorito-kinzigitica (Dal Piaz et al. 1992a), IIDK nappe = Seconda Zona Diorito Kinzigitica (Babist et al. 2006), 2DK zone (Giuntoli & Engi 2016)

Description

Description

Gneise, Metabasite und Marmore der Sesia-Decke, mit einer charakteristischen spätvariszischen granulitfaziellen Metamorphose.

Babist et al. 2006: the IIDK nappe, or ‘‘Seconda Zona Diorito Kinzigitica’’, is preserved within two large synforms in the northeastern part of the Sesia Zone, and to the southwest generally follows the contact of the Bard and Mombarone nappes [Minnigh, 1977]. The name of this nappe belies its close lithological affinity with pre-Alpine metasediments of the Ivrea Zone (so-called kinzigites, or ‘‘Prima Zona Diorito Kinzigitica’’ [Carraro et al., 1970; Dal Piaz et al., 1971; Isler and Zingg, 1974; Compagnoni et al., 1977]).

Hierarchy and sequence

Subordinate units

• Granuliti della Val Vogna

Palaenography and tectonic

Paleogeography

Adriatic continental margin :

southern, passive continental margin / platform

Tectonic unit (resp. main category)

• Sesia

Conditions of formation

Unterkruste

Metamorphism

polycyclic

Metamorphic facies

• greenschist facies (epizone)
• granulite facies
• eclogite facies

Note on metamorphism

Variscan ; Alpine (HP-LT + greenschist)

References

Definition

Artini E., Melzi G. (1900) : Ricerche petrografiche e geologiche sulla Valsesia. Memorie del Regio Istituto Lombardo di scienze e lettere 18, 219-390

Definition

Gouffon Yves (Editor) (2024) : Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern

p.81: The Second Dioritic-Kinzigitic Zone (2DK) consists of kilometer-scale slices of micaschists, characterized by well-preserved pre-Alpine amphibolite to granulite-facies mineral assemblages as well as minor amphibolites and marbles, locally overprinted by the early Alpine high-pressure metamorphism.