Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
MULTISTAGE STRUCTURAL EVOLUTION OF NORTHERN KARAKORAM (HUNZA REGION, PAKISTAN)
Autore:
ZANCHI A; GRITTI D;
Indirizzi:
DIPARTIMENTO SCI AMBIENTE & TERR,VIA EMANUELI 15 I-20126 MILAN ITALY DIPARTIMENTO SCI TERRA MILANO I-20133 MILAN ITALY
Titolo Testata:
Tectonophysics
fascicolo: 1-3, volume: 260, anno: 1996,
pagine: 145 - 165
SICI:
0040-1951(1996)260:1-3<145:MSEONK>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
ASIA; MAGMATISM; COLLISION; TECTONICS; GRANITES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
A. Zanchi e D. Gritti, "MULTISTAGE STRUCTURAL EVOLUTION OF NORTHERN KARAKORAM (HUNZA REGION, PAKISTAN)", Tectonophysics, 260(1-3), 1996, pp. 145-165

Abstract

Detailed mapping and structural work in Upper Hunza Valley, Pakistan,have enlightened the tectonics and the structural evolution of the sedimentary cover of Northern Karakorum. This includes the Northern Sedimentary Belt (NSB) with the Guhjal and Sost Units (Permian-Cretaceous), cropping out north of the Karakorum Axial Batholith (KAB); the NSB is bounded to the north by the Misgar Unit, consisting of slates of unknown age. In the Sost Unit a mid-Cretaceous deformed belt is sealed with a strong angular unconformity by the Late Cretaceous formations. Folds within the mid-Cretaceous belt possibly indicate north-vergent transport. Stacking of NE- to N-vergent thrusts sheets postdates the deposition of Cretaceous sediments, which are largely included within tectonic slices developed along the southern flank of the Sost stack. The southern part of the stack is in turn intruded by the Palaeogene Kuk pluton belonging to the Batura Unit of the KAB. S- to SSE-vergent thrusting was successively active, stacking steep north-dipping thrust sheets along the northern side of the Sost Unit, forming a complex antiformal stack, well exposed around Sost. High angle pure dip-slip reverse and oblique dextral motions are recorded by fault-slip data and calc-mylonites along major faults, forming a transpressive fault zone close to the contact between the Sost and Misgar Units. During this stage, the Misgar Unit was thrusted southward above the Sost Unit along the Northern Fault. Prosecution of dextral motion was also active afterwardsalong the boundary between the two units. The importance of wrench tectonics is also indicated by widespread activation of E-W sinistral strike-slip faults in the whole study area, generally moving along pre-existent fault planes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 21:39:03