eclogite rock importance

McGraw-Hill. We report the results of a Sm-Nd isotopic study of whole-rock samples from the Chamrousse ophiolite complex, in the Variscan basement of the Western Alps, France. Eclogite. It turns out not to be the case. Of these latter he places glaucophane eclogite as the most important. Smulikowski, K. (1990). In: McGraw Hill Encyclopedia of Science & Technology, 10th Edition. Eclogite forms at pressures greater than those typical of the crust of the Earth. Eclogite forms at pressures greater than those typical of the crust of the Earth. First, it forms at pressures greater than those typical of the crust of the Earth. Kyanite seems to be absent in group C eclogites and quartz is rare. 5. In these ‘wetter’ rocks low-density hydrated minerals remain stable at higher pressures, so the entire slab is harder to subduct. Selje, Norway. An unusually dense rock, eclogite can play an important role in driving convection within the solid Earth. Real reactions in real rocks are no doubt more complicated and there are more components. Our editors will review what you’ve submitted and determine whether to revise the article. Omphacite is a pyroxene group mineral with a composition in the middle between jadeite and diopside. Eclogite is unusually dense for a silicate rock (3.4–3.5 g/cm3) which suggests that very high pressure was involved in the formation of this rock type. The foliation is … Eclogite. In: The Encyclopedia of Igneous and Metamorphic Petrology (Encyclopedia of Earth Sciences Series) (Ed. This article was most recently revised and updated by,, University of California Santas Barbara - Earth Science - Eclogite Formation and the Rheology, Buoyancy, Seismicity, and H20 Content of Oceanic Crust. Wiley-Blackwell. 6. 41-42. Eclogite, any member of a small group of igneous and metamorphic rocks whose composition is similar to that of basalt. Dictionary of Petrology. This is important as these rocks nearly reached the depth at which normal eclogite becomes denser than the surrounding mantle, at which point subduction becomes irreversible. Britannica Kids Holiday Bundle! Selje, Norway. If you take a look at the metamorphic facies diagram: then you’ll see that the temperature range 400-500 and pressure 12 kbar is in the lower part of the eclogite facies field. Eclogite is a metamorphic rock formed when mafic igneous rock is subjected to high pressure. Straume, A. K. & Austrheim, H. (1999): Importance of fracturing during retro-metamorphism of eclogites. Phengite (variety of muscovite mica) is a common constituent too (light brown reflective flakes). The geophysical importance of eclogite is that it represents the highest density commonly attained by crustal rocks. Igneous and Metamorphic Petrology, 2nd Edition. (2007). Garnet in eclogite is usually iron-rich pyrope (contains similar amount of Mg and Fe). They are formed when volcanic or metamorphic rocks rich in such mafic minerals are subjected to extremely high pressures and moderate to relatively high temperatures. Hence, it is geologically hugely important rock not only as a contributor to the mantle conveyor belt but also as a source rock of the continental crust. Granulitized eclogite rock was reported by Lombardo and Rolgo (2000 see Guillot et al., 2008) from the Ama Drime range of Eastern Himalaya (in the Arun Valley, east of Everest–Makalu Massifs). Garnet poikiloblasts occur as euhedral crystals, rich in inclusions such as titanite, epidote, apatite, and quartz. Prentice Hall. 17, 637-652 Hareidlandet Best, Myron G. (2002). def. Some types of rocks have exceptional properties and can be used in medical industry. While the δ18O values of garnets in high MgO eclogites lie within the range for mantle peridotites, low MgO garnets have more variable δ18O values (4.7 to 6.8‰) and

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