Chugach terrane

E687160

The Chugach terrane is a large accretionary complex in southern Alaska composed mainly of deformed sedimentary and volcanic rocks that were scraped off an ancient subducting oceanic plate and later uplifted to form part of the modern Chugach Mountains.

All labels observed (1)

Label Occurrences
Chugach terrane canonical 2

How this entity was disambiguated

Statements (48)

Predicate Object
instanceOf accretionary complex
geologic terrane
accretionAge Cretaceous
adjacentTo Prince William terrane
Wrangellia terrane
ageRange Cenozoic
Mesozoic
composedMostlyOf deformed sedimentary rocks
deformed volcanic rocks
contains McHugh Complex
Valdez Group
containsStructures imbricate fault stacks
shear zones
thrust faults
country United States
deformationAssociatedWith subduction of Pacific oceanic lithosphere
exposedIn Chugach Mountains
Kenai Peninsula
Prince William Sound region
extendsAlong Gulf of Alaska margin
formedBy subduction-related accretion
formsPartOf Alaska convergent margin accretionary prism
lithologyIncludes andesite
argillite
basalt
chert
graywacke
minor limestone
turbidites
locatedIn southern Alaska
maximumDepositionalAge Late Jurassic to Cretaceous
metamorphicGrade low-grade metamorphism
namedAfter Chugach Mountains
originatedFrom material scraped off a subducting oceanic plate
orogenyRelatedTo subduction along the southern Alaska margin
overlies Prince William terrane (locally and structurally complex relationships)
partOf Chugach Mountains
plateBoundaryType oceanic-continental convergent boundary
region Alaska
researchField sedimentology
structural geology
tectonics
significance records long-lived subduction and accretion along the North American margin
structuralStyle folded
intensely faulted
strongly deformed
tectonicSetting convergent margin
tectonicTransportDirection northward relative to North America

How these facts were elicited

Referenced by (2)

Full triples — surface form annotated when it differs from this entity's canonical label.

Mount Marcus Baker geologicalSetting Chugach terrane
Burns Glacier geologicalProvince Chugach terrane