oceanic crust


Also found in: Acronyms, Wikipedia.

oceanic crust

[‚ō·shē′an·ik ′krəst]
(geology)
A thick mass of igneous rock which lies under the ocean floor.
References in periodicals archive ?
Lead author Frieder Klein said the team was totally surprised to find this massive pool of abiotic methane in the oceanic crust and mantle.
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 (Figure 5).
"Our aim is to be able to use the oceanic crust microfossil record as a model system to guide Martian exploration," Ivarsson explains.
(https://www.nature.com/articles/nature25972) The paper on the perovskite diamond appeared online Wednesday in the journal Nature, under the title "CaSiO3 perovskite in diamond indicates the recycling of oceanic crust into the lower mantle." Its lead author was Fabrizio Nestola from the University of Padova, Italy.
It's related to southwards subduction of the Meso-Tethys oceanic crust and slab breaking off (Zhu et al., 2009; Harris, Inger, & Ronghua, 1990; Coulon, Maluski, & Bollinger, 1986).
What is the difference in composition between the oceanic crust and the continental crust?
Russia should gather conclusive evidence that the areas are made up of continental rather than oceanic crust and therefore constitute a natural extension of the Eurasian continent, Vernikovsky said.
Following this process, eventually in upper Cretaceous and Paleocene eras simultaneous with closure of the Neotethyan Ocean, some parts of the oceanic crust have had obduction movement.
Hayasaka [12] suggested that the cumulate metagabbro (pyroxenite, anorthosite, and eucrite) in the Asago area is rather similar in petrography and geochemistry to those in the Oshima peninsula and Ayabe areas (Figure 1), thus suggesting that this metagabbro originated from a lower crustal section of oceanic crust and was derived from the T-type MORB source (i.e., OB ophiolite) (Figure 2(a)).
The team measured oxygen concentrations in sediment cores collected above the rocky oceanic crust, almost three miles below the sea surface, on the western edge of the remote Mid-Atlantic Ridge.
Local high rates of convergence at the Hellenic subduction zone (35mm/yr) are associated with back-arc spreading throughout Greece and western Turkey above the subducting Mediterranean oceanic crust. Crustal normal faulting throughout this region is a manifestation of extensional tectonics associated with the back-arc spreading.
An example is the recent addition of more than 2,000 oceanic crust segments, the definition of intracratonic boundaries for crustal assembly back to 2.5 billion years, and the identification of zones of attenuated continental crust.