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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Far East
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Japan
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Honshu
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Tohoku (1)
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Canada
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Primary terms
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Asia
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sedimentary rocks
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Optimal Multichannel Stretch Factors for Estimating Changes in Seismic Velocity: Application to the 2012 M w 7.8 Haida Gwaii Earthquake
Advances in the thermal and petrologic modeling of subduction zones
High pore pressures and porosity at 35 km depth in the Cascadia subduction zone
Isotopic and elemental partitioning of boron between hydrous fluid and silicate melt
Are the lower planes of double seismic zones caused by serpentine dehydration in subducting oceanic mantle?
Large 18 O and 13 C depletions in greenschist facies carbonate rocks, western Arizona
The importance of blueschist → eclogite dehydration reactions in subducting oceanic crust
Computer programs for petrologic P-T-t path calculations
The Central Metamorphic Belt and Trinity terrane of the Klamath Mountains and the Feather River terrane of the northern Sierra Nevada share strong similarities in their protolith types, metamorphic parageneses, structures, ages of formation and metamorphism, and relations with surrounding units. These terranes consist of ductilely deformed ultramafic to mafic plutonic and volcanic rocks and minor oceanic sedimentary rocks interpreted as oceanic lithosphere. Ultramafic rocks in the Trinity terrane and the Feather River terrane were hydrated and metasomatized under lower amphibolite-facies conditions. Mafic and sedimentary rocks in the Central Metamorphic Belt and the Feather River terrane contain upper greenschist to amphibolite-facies parageneses formed during Devonian time. Phase assemblages and mineral chemistries indicate peak P-T conditions of 500° to 650 ± 50°C and 500 ± 300 MPa for both terranes. The similarities imply that the Klamath Mountains and Sierra Nevada share a common early to middle Paleozoic history. The Trinity terrane/Central Metamorphic Belt represents an arc basement/subduction zone couple; the Feather River terrane may also represent such a couple.