As the oceanic crust subducts, it experiences a very high pressure but relatively low temperature style of regional metamorphism, and the basalt and gabbro are transformed to blueschist (or glaucophane schist) and then to eclogite
'There are a lot of interesting geological spots in Oman such as the grand canyon in Jebel Shams, pillow lavas in Wadi al Jizi, eclogite
in Sifah beach, Wadi al Maih and Bimmah sinkhole.'
The study titled, "Multidisciplinary Constraints on the Abundance of Diamond and Eclogite
in the Cratonic Lithosphere," was published June 19 in the (https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018GC007534) journal Geochemistry, Geophysics, Geosystems.
They found that the best explanation for the speeds actually observed underground versus those predicted in their virtual rock models was that 1 to 2 percent of the roots of the cratons was made up of diamonds, while the rest was made up of peridotite (the main type of rock in Earth's upper mantle) and a little bit of eclogite
rocks (from the ocean's crust).
Petrology and geochemistry of the lawsonite (pseudomorph)-bearing eclogite
in Yuka terrane, North Qaidam UHPM belt: An eclogite
facies metamorphosed oceanic slice.
Their topics include probing crustal thickness evolution and geodynamic processes in the past from magma records: an integrated approach, the exhumation of Western Alboran peridotites in an Oligocene-Miocene oblique continental rift system, crust-mantle boundary in eastern North America from the (oldest) craton to the (youngest) rift, the role of percolating melts in Antarctic subcontinental lithosphere mantle: new insights from Handler Ridge mantle xenoliths in northern Victoria Land, and detrital zircon evidence for eclogite
formation by basal subduction erosion: an example from the Yukon-Tanana composite arc in the Canadian Cordillera.
At the earliest, Adakite refers to the intermediate-acidic igneous rock with unique geochemical characteristics, which is formed by young subducting oceanic crust melting under eclogite
Local origin of high pressure vein material in eclogite
facies of the Zermatt-Saas Zone, Switzerland.
A sample of eclogite
(ARQ-359) from the Arquia Complex in the area of interest was selected for Lu-Hf garnet geochronology, with multiple garnet and whole-rock fractions, each consisting of 200-250 mg of material, which were dissolved in the radiogenic isotope clean laboratory at Washington State University according to the standard protocol described by Nesheim et al.
It is widely accepted that TTG magmas were created by the partial melting of hydrous metabasaltic rocks transformed into garnet-bearing amphibolite or eclogite
, under a variety of fluid conditions (Sen & Dunn 1994; Zamora 2000).
3-D X-ray tomography of diamondiferous mantle eclogite
xenoliths, Siberia: A review.
It may form carbonate eclogite
in the upper mantle and carbonate garnetite in the transition zone and uppermost lower mantle.