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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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Arabian Peninsula
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Oman (1)
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Far East
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Burma (2)
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China
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Xizang China (3)
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Indus-Yarlung Zangbo suture zone (1)
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Middle East
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Cyprus
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Troodos Massif (1)
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Tibetan Plateau (1)
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Tyumen Russian Federation
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Yamal-Nenets Russian Federation (1)
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Commonwealth of Independent States
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Russian Federation
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Polar Urals (3)
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Tyumen Russian Federation
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Yamal-Nenets Russian Federation (1)
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Urals
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Polar Urals (3)
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DSDP Site 504 (1)
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Pacific Ocean
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West Pacific
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commodities
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metal ores
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copper ores (1)
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Paleozoic (1)
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igneous rocks
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igneous rocks
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plutonic rocks
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ultramafics
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chromitite (5)
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peridotites
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dunite (1)
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harzburgite (1)
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volcanic rocks
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andesites
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boninite (1)
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basalts
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mid-ocean ridge basalts (1)
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ophiolite (5)
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metamorphic rocks
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ophiolite (5)
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minerals
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alloys
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carbides
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moissanite (3)
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carbonates (1)
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native elements
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diamond
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microdiamond (1)
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oxides
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chromite (1)
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hematite (1)
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magnetite (1)
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wustite (1)
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silicates
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framework silicates
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feldspar group (1)
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silica minerals
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coesite (1)
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stishovite (1)
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orthosilicates
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nesosilicates
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olivine group
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forsterite (1)
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olivine (1)
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sulfides (1)
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Primary terms
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Asia
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Arabian Peninsula
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Oman (1)
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Far East
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Burma (2)
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China
-
Xizang China (3)
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-
-
Indus-Yarlung Zangbo suture zone (1)
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Middle East
-
Cyprus
-
Troodos Massif (1)
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-
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Tibetan Plateau (1)
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Tyumen Russian Federation
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Yamal-Nenets Russian Federation (1)
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-
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bitumens
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asphalt (1)
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chemical analysis (1)
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crust (3)
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crystal chemistry (1)
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Deep Sea Drilling Project
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IPOD
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Leg 69 (1)
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Leg 70 (1)
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Leg 83 (1)
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Leg 92 (1)
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economic geology (2)
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folds (1)
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hydrogen (1)
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igneous rocks
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plutonic rocks
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ultramafics
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chromitite (5)
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peridotites
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dunite (1)
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harzburgite (1)
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volcanic rocks
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andesites
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boninite (1)
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basalts
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mid-ocean ridge basalts (1)
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inclusions
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fluid inclusions (1)
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intrusions (1)
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mantle (4)
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Mesozoic
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Cretaceous (2)
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metal ores
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chromite ores (1)
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copper ores (1)
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iron ores (1)
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polymetallic ores (2)
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zinc ores (1)
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metals
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iron (1)
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metasomatism (2)
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mineral deposits, genesis (1)
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mineral exploration (2)
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nitrogen (1)
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Ocean Drilling Program
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Leg 111 (1)
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Leg 137 (1)
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Leg 140 (1)
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Leg 148 (1)
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Pacific Ocean
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North Pacific
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Northwest Pacific (1)
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West Pacific
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Northwest Pacific (1)
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paleomagnetism (1)
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Paleozoic (1)
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spectroscopy (1)
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tectonics (1)
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tectonophysics (2)
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rock formations
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Semail Ophiolite (1)
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Troodos Ophiolite (2)
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Ultrahigh-pressure to high-pressure eclogite in Cuban ophiolitic mélange reveals proto-Caribbean spreading ridge subduction
Mineral and whole-rock geochemistry of high-Al podiform chromitites in the Fizh Massif of the Cretaceous Oman ophiolite: origin of hydrous N-MORB melts in a nascent forearc setting
Spectroscopic analysis of microdiamonds in ophiolitic chromitite and peridotite
Discovery of in situ super-reducing, ultrahigh-pressure phases in the Luobusa ophiolitic chromitites, Tibet: New insights into the deep upper mantle and mantle transition zone
Diamonds in Ophiolites
Diamond- and coesite-bearing chromitites from the Luobusa ophiolite, Tibet
Ultra-high pressure minerals in the Luobusa Ophiolite, Tibet, and their tectonic implications
Abstract Numerous ultra-high-pressure minerals have been recovered from podiform chromities in the Luobusa ophiolite, Tibet. Recovered minerals include diamond, moissanite, Fe-silicides, wüstite, Ni–Fe–Cr–C alloys, PGE alloys and octahedral Mg–Fe silicates. These are accompanied by a variety of native elements, including Si, Fe, Ni, Cr and graphite. All of the minerals were hand-picked from heavy-mineral separates of the chromitites and care was taken to prevent natural or anthropogenic contamination of the samples. Many of the minerals and alloys are either enclosed in, or attached to, chromite grains, leaving no doubt as to their provenance. The ophiolite formed originally at a mid-ocean ridge (MOR) spreading centre at 177±33 Ma, and was later modified by suprasubduction zone magmatism at about 126 Ma. The chromitites were formed in the suprasubduction zone environment from boninitic melts reacting with the host peridotites. The UHP minerals are believed to have been transported from the lower mantle by a plume and incorporated in the ophiolite during seafloor spreading at 176 Ma. Blocks of the mantle containing the UHP minerals were presumably picked up by the later boninitic melts, transported to shallow depth and incorporated in the chromitites during crystallization.