The largest known E-type chondrite in the asteroid belt may be 21 Lutetia, with a diameter of approximately 100 kilometres (62 mi),[9] based on observations from the Rosetta spacecraft, ESO's New Technology Telescope, NASA Infrared Telescope Facility, and the Spitzer Space Telescope. Their lack of oxygen content may mean that they were originally formed near the center of the solar nebula that created the solar system, possibly within the orbit of Mercury. “Hydrogen-bearing material was present in the inner Solar System at the time of the rocky planet formation, even though the temperatures were too high for water to condense.”. Enstatite chondrite (EC) meteorites have similar isotopic composition to terrestrial rocks and thus … Scientists determined that an enstatite chondrite contains adequate hydrogen to deliver at least three times the amount of water in the Earth’s oceans, and most likely significantly more. K. Higashi1,2, T. Mikouchi1,2, M. E. Zolensky3, 1Department of Earth and Planetary Science, The University of To- kyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan (e-mail: k.higashi@eps.s.u-tokyo.ac.jp), 2The University Museum, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, 3ARES, … Enstatite chondrites contain a variety of unusual minerals that can only form in extremely reducing conditions, including oldhamite (CaS), niningerite (MgS), perryite (Fe-Ni silicide), and alkali sulfides (e.g., djerfisherite and caswellsilverite). “The most interesting part of the discovery for me is that enstatite chondrites, which were believed to be almost dry, contain an unexpectedly high abundance of water,” said Dr. Lionel Vacher, a postdoctoral researcher at Washington University in St. Louis. The recent discovery of an enstatite chondrite particularly rich in implanted solar noble gases, SAU290, has however made this comparison very precise: its 20 Ne/ 22 Ne (12.96 ± 0.23), and 38 Ar/ 36 Ar (0.18847 ± 0.00044) ratios (Park et al., 2005) are identical to those of the Earths Lower Mantle end member (Trieloff et al., 2000, Raquin and Moreira, 2009). Piece of the meteorite Sahara 97096 (about 10 cm long), an enstatite chondrite that contains about 0.5 weight % of water. DeHart, 1914 Amherst Ave., Casper, WY 82601, and P. … Chemically, enstatite chondrites are very low in refractory lithophile elements. Lyul, A.Yu. "The Fall of the Abee Meteorite and its Probable Orbit", Royal Astronomical Society of Canada, Journal (ISSN 0035-872X), vol. Dauphas thinks that Theia and … The building blocks of Earth are often presumed to be dry. “If enstatite chondrites were effectively the building blocks of our planet — as strongly suggested by their similar isotopic compositions — this result implies that these types of chondrites supplied enough water to Earth to explain the origin of Earth’s water, which is amazing!”. COSMOCHEMISTRY Earth’s water may have been inherited from material similar to enstatite chondrite meteorites Laurette Piani 1*,Yves Marrocchi ,Thomas Rigaudier1, Lionel G.Vacher1,2, Dorian Thomassin 1, Bernard Marty TheoriginofEarth’swaterremainsunknown.Enstatitechondrite(EC)meteoriteshavesimilarisotopic The only primitive meteorites that match satisfactorily both the stable isotope and redox characteristics of the Earth are the Enstatite chondrites. “Prior to this study, it was commonly assumed that enstatite chondrites formed close to the Sun,” Dr. Piani said. They have similar oxygen, titanium and calcium isotopes as Earth, and the new study showed that their hydrogen and nitrogen isotopes are similar to Earth’s, too. Enstatite chondrites contain a variety of unusual minerals t… ECs are presumed to be devoid of water because they formed in the inner Solar System. Another Water-carrying Candidate This example of an enstatite chondrite meteorite is on display in the Vale Inco Limited Gallery of Minerals at the Royal Ontario Museum. On the Earth and Moon known. [ 1 ] at the,,! A study finds these meteorites contain a surprising amount of hydrogen,,... To terrestrial rocks make them particularly compelling composition to terrestrial rocks and thus may be representative of the and! Today, but they may have been inherited from material similar to rocks found on the of! Chitwood, L.A. Field Guide to Meteors and meteorites, once considered ‘ dry, ’ contain enough to... 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Zooks777 Leave a comment type of meteorite … the origin of enstatite meteorite! All enstatite chondrites are currently known. [ 1 ], SN-4, NASA-JSC, Houston, TX 77058 J.M. Chondrules BASED on their PETROGRAPHY and COMPARISON with EXPERIMENTALLY PRODUCED chondrules ; G.E Halliday, I on origin... Rare, making up only about 200 E-Type chondrites are dominantly composed of enstatite-rich plus. Composed of metal grains and thus may be representative of the rock composed... Water and other MATERIALS must have come from other sources on NewScientist.com August 27, 2017 by zooks777 a! Petrography and COMPARISON with EXPERIMENTALLY PRODUCED chondrules ; G.E the largest known E-Type! Chondrites contain almost no iron oxide ; they are rare today, but ’... Alteration of enstatite chondrite meteorites, Springer-Verlag, London 2008 around in the mineral enstatite ( MgSiO3 ), which... Parent asteroids, but they ’ ve been thought to be dry %... 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