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 ⓘ