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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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Namibia (1)
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South Africa
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West Africa
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Cameroon (1)
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Antarctica
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Paleozoic
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upper Precambrian
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Primary terms
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absolute age (1)
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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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Kalahari Desert (1)
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West Africa
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Cameroon (1)
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Japan
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asteroids (1)
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atmosphere (1)
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New Zealand
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brines (3)
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Canada
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Quebec
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Western Canada
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Northwest Territories
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carbon
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organic carbon (4)
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Caribbean region (3)
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Cenozoic
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Quaternary
-
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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upper Miocene
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Messinian (1)
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Paleogene
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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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Guatemala (2)
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chemical analysis (3)
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climate change (3)
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continental shelf (2)
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hydrates
Subsurface heat and salts cause exceptionally limited methane hydrate stability in the Mediterranean Basin
Oceanic intraplate faulting as a pathway for deep hydration of the lithosphere: Perspectives from the Caribbean
High-magnitude stresses induced by mineral-hydration reactions
Global Ba/Nb systematics in arc magmas reflect the depths of mineral dehydration in subducted slabs
Raman scattering and Cr 3+ luminescence study on the structural behavior of δ-AlOOH at high pressures
A State of the Art Review on the Wellbore Blockage of Condensate Gas Wells: Towards Understanding the Blockage Type, Mechanism, and Treatment
Recent Advances in our Understanding of Water and Aqueous Activity in Chondrites
Methane migration mechanisms for the Green Canyon Block 955 gas hydrate reservoir, northern Gulf of Mexico
Experimental Study on Influences of Self-Preservation Effects and Memory Effects on the Hydrate Decomposition Process
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
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.