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.
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
accretionary complex
ⓘ
geologic terrane ⓘ |
| accretionAge | Cretaceous NERFINISHED ⓘ |
| adjacentTo |
Prince William terrane
NERFINISHED
ⓘ
Wrangellia terrane NERFINISHED ⓘ |
| ageRange |
Cenozoic
ⓘ
Mesozoic ⓘ |
| composedMostlyOf |
deformed sedimentary rocks
ⓘ
deformed volcanic rocks ⓘ |
| contains |
McHugh Complex
NERFINISHED
ⓘ
Valdez Group NERFINISHED ⓘ |
| containsStructures |
imbricate fault stacks
ⓘ
shear zones ⓘ thrust faults ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| deformationAssociatedWith | subduction of Pacific oceanic lithosphere ⓘ |
| exposedIn |
Chugach Mountains
NERFINISHED
ⓘ
Kenai Peninsula NERFINISHED ⓘ Prince William Sound region NERFINISHED ⓘ |
| 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 NERFINISHED ⓘ |
| maximumDepositionalAge | Late Jurassic to Cretaceous ⓘ |
| metamorphicGrade | low-grade metamorphism ⓘ |
| namedAfter | Chugach Mountains NERFINISHED ⓘ |
| originatedFrom | material scraped off a subducting oceanic plate ⓘ |
| orogenyRelatedTo | subduction along the southern Alaska margin ⓘ |
| overlies | Prince William terrane (locally and structurally complex relationships) NERFINISHED ⓘ |
| partOf | Chugach Mountains NERFINISHED ⓘ |
| plateBoundaryType | oceanic-continental convergent boundary ⓘ |
| region | Alaska NERFINISHED ⓘ |
| 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 ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.