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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Central Africa
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Congo Democratic Republic
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Shaba Congo Democratic Republic (2)
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East Africa
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Kenya (1)
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West Africa
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Antarctica
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upper Precambrian
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uranium minerals (12)
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Primary terms
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absolute age (1)
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Africa
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Central Africa
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Congo Democratic Republic
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Shaba Congo Democratic Republic (2)
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East Africa
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Kenya (1)
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Malawi (1)
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Kalahari Desert (1)
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West Africa
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Cameroon (1)
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Antarctica
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Kamchatka Russian Federation
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Tolbachik (1)
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Russian Pacific region (1)
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Atlantic Ocean
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North Atlantic
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Blake-Bahama Outer Ridge (4)
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Caribbean Sea (1)
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Gulf of Mexico
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Mississippi Canyon (1)
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North Sea (1)
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Straits of Florida (1)
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atmosphere (1)
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Canada
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-
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Western Canada
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British Columbia
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Queen Charlotte Islands (1)
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Northwest Territories
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Mackenzie Delta (3)
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Mallik Field (2)
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Yukon Territory (2)
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-
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carbon
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C-13/C-12 (6)
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organic carbon (3)
-
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Caribbean region (2)
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Cenozoic
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Quaternary
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Pleistocene
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Lake Lahontan (1)
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-
-
Tertiary
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Neogene
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Miocene
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lower Miocene (1)
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Paleogene
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Eocene
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lower Eocene (1)
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Paleocene
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upper Paleocene (1)
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Paleocene-Eocene Thermal Maximum (2)
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Central America
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chemical analysis (3)
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climate change (3)
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Deep Sea Drilling Project
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Leg 67
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hydrates
Superhydrous hematite and goethite: A potential water reservoir in the red dust of Mars?
Where is the Hydrogen?
Probing the Structure of Melts, Glasses, and Amorphous Materials
A highly hydrated variety of elpidite from the Khibiny alkaline complex, Kola Peninsula, Russia
High-pressure phase stability and elasticity of ammonia hydrate
Šlikite, Zn 2 Mg(CO 3 ) 2 (OH) 2 ·4H 2 O, a new Zn–Mg carbonate from Plavno, Jáchymov ore district, Czech Republic
Hydroxylhedyphane, Ca 2 Pb 3 (AsO 4 ) 3 (OH), a new member of the apatite supergroup from Långban, Sweden
Kenngottite, Mn 3 2 + Fe 4 3 + (PO 4 ) 4 (OH) 6 (H 2 O) 2 : a new phosphate mineral from Krásno near Horní Slavkov, Czech Republic
Trimeric As 3 3 + O 6 clusters in walentaite: crystal structure and revised formula
Abstract Eclogites in the high-pressure (HP) and ultrahigh-pressure (UHP) belts record subduction-zone processes; exhumed eclogites of seafloor protoliths record low-temperature (mostly <600°C), high-pressure and ‘wet’ environments: that is, relatively ‘cold’ subduction with highly hydrous minerals such as lawsonite. In contrast, eclogites formed by the continental subduction record relatively ‘hot’ ( T > 650°C) and ‘dry’ ultrahigh-pressure metamorphic (UHPM) conditions with syncollisional magmatism. Here, we investigate some eclogites from two ophiolite sequences that intercalated in the North Qaidam UHPM belt, which is genetically associated with continental subduction/collision. The observations of lawsonite pseudomorphs in garnets, garnet compositional zoning, mineral and fluid inclusions in zircons, and zircons with distinct trace-element patterns and U–Pb ages all suggest that these eclogites represent two exhumation episodes of subduction-zone metamorphic rocks: the early ‘cold’ and ‘wet’ lawsonite eclogite and the late ‘hot’ and ‘dry’ UHP kyanite eclogite. The early lawsonite-bearing eclogite gives metamorphic ages of 470–445 Ma and the later kysnite-bearing eclogite gives metamorphic ages of 438–420 Ma, with a time gap of c. 7–10 myr. This gap may represent the timescale for transition from oceanic subduction and continental subduction to depths greater than 100 km. We conclude that evolution from oceanic subduction to continental collision and subduction was a continuous process. In addition, we find that titanium contents in zircons have a positive correlation with U contents. Ti-in-zircon thermometry is likely to be invalid or limited for low-temperature eclogites.