Meteorite study suggests Earth may have been wet since it formed: Enstatite chondrite meteorites, once considered 'dry,' contain enough water to fill the oceans -- and then some. Lyul, A.Yu. AQUEOUS ALTERATION OF ENSTATITE CHONDRITE MATERIALS IN THE KAIDUN METEORITE. This page was last edited on 8 January 2021, at 18:51. A., Millman, P. M., & Halliday, I. Griffin, A. ScienceDaily . EL (low-iron) chondrites contain larger chondrules (>0.5 millimetres (0.020 in)), and low ratios of siderophile elements to silicon. 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). They tend to be high in the mineral enstatite (MgSiO3), from which they derive their name. “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.”. The origin of Earth’s water remains unknown. 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: firstname.lastname@example.org), 2The University Museum, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, 3ARES, … The meteorites provide a clue that water didn’t have to come from far away. These meteorites are so heavily altered by water that it is unclear whether they once contained chondrules. Enstatite Chondrite Enstatite chondrites (ECs) are characterized by very reduced and anhydrous assemblages, and their major minerals are Fe-free (or nearly so) enstatite pyroxene (∼70–80wt.%), metallic Fe–Ni (∼20–30wt.%), and abundant sulfides including troilite, oldhamite (CaS), members of the Fe–Mg–Mn cubic monosulfide solid solution keilite-ninigerite-alabandite, and many others (e.g., … The origin of Earth’s water remains unknown. Wikimedia Commons / CC BY 3.0 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. Lavrentyeva, Z.A. Enstatite chondrite finds exhibit significantly reduced grain density compared with falls ... (CaS), which is so water soluble that samples of the EH4 fall Parsa exhibited signs of oldhamite loss due simply to moisture in the environment where it was stored (Bhandari et al. Enstatite chondrites contain a variety of unusual minerals t… Enstatite chondrite meteorites, once considered ‘dry,’ contain enough water to fill the oceans — and then some. A new study published in the journal Science shows that these meteorites contain sufficient hydrogen to have delivered to Earth at least three times the mass of water in its oceans. Metallic Fe-Ni (iron-nickel) and Fe-bearing sulfide minerals contain nearly all of the iron in this type of meteorite. EH (high-iron) chondrites contain small chondrules (~0.2 millimetres (0.0079 in)) and high ratios of siderophile elements to silicon. The 107 kilograms (236 lb) stone fell in a farmer's wheat field, creating an impact pit 0.7 m in diameter and 1.5 m deep.  It is classified as being a shock-melted breccia, its minerals having recrystallized after the impact that knocked it off of its parent body. Somewhat more than 10% of the rock is composed of metal grains. E-type chondrites are among the most chemically reduced rocks known, with most of their iron taking the form of metal or sulfide rather than an oxide. The team also proposes that a large amount of the atmospheric nitrogen — the most abundant component of the Earth’s atmosphere — could have come from the enstatite chondrites. – The Daily Chronicle, Bam Bam Resources Provides Corporate Update and Recap on Majuba Hill Nevada – Junior Mining Network, Let’s Reminisce: Appreciation for Canada’s rivers – North Texas e-News, Turbulent Environment Set Stage for Leaps in Human Evolution 320k Years Ago – The Wire Science. Chemically, enstatite chondrites are very low in refractory lithophile elements. "The Fall of the Abee Meteorite and its Probable Orbit", Royal Astronomical Society of Canada, Journal (ISSN 0035-872X), vol. Enstatite (E) chondrites are a rare and unusual type of meteorite. Their oxygen isotopic compositions are intermediate between ordinary and carbonaceous chondrites, and are similar to rocks found on the Earth and Moon. Science. 1980). Published on January 27, 2017 by zooks777 Leave a comment. Enstatite chondrite (EC) meteorites have similar isotopic composition to terrestrial rocks and thus may be representative of the material that formed Earth. In meteorite: The ages of meteorites and their components …refractory inclusions formed, and in enstatite chondrites between 9 and 34 million years after. Enstatite chondrites (also known as E-type chondrites) are a rare form of meteorite thought to comprise only about 2% of the chondrites that fall on Earth. ECs are presumed to be devoid of water because they formed in the inner Solar System. All enstatite chondrites are dominantly composed of enstatite-rich chondrules plus abundant grains of metal and sulfide minerals. The new mineral, dubbed "Wassonite," was discovered inside the Yamato 691 enstatite chondrite meteorite by American researchers from NASA as well as scientists from Japan and South Korea. “In our study, we have carefully selected the enstatite chondrite meteorites and applied a special analytical procedure to avoid being biased by the input of terrestrial water.”. Enstatite chondrite (EC) meteorites have similar isotopic composition to terrestrial rocks and may represent the material that formed Earth.  Only about 200 E-Type chondrites are currently known.. If Earth formed entirely of this material, it would have received 2-3 times the total mass of water present in the Earth's oceans (L Piani, Museum of Natural History in Paris) Ivliev, A.I. A., Millman, P. M., & Halliday, I. “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!”. Fe-Ni metal contains ~1 wt% silicon.  The largest known E-type chondrite in the asteroid belt may be 21 Lutetia, with a diameter of approximately 100 kilometres (62 mi), based on observations from the Rosetta spacecraft, ESO's New Technology Telescope, NASA Infrared Telescope Facility, and the Spitzer Space Telescope. 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Skripnik, A.Ya "Research of Shock-Thermal History of the Enstatite Chondrites by Track, Thermoluminescnce and Neutron-Activation (NAA) Methods" Lunar and Planetary Science XXXV, 2004, Lutetia: A rare survivor from the birth of Earth, by ESO, Garching, Germany, Published: November 14, 2011, Earth’s water may have been inherited from material similar to enstatite chondrite meteorites, "Meteoritical Bulletin: Recommended classifications", https://en.wikipedia.org/w/index.php?title=Enstatite_chondrite&oldid=999149365, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License. A chondrite / ˈ k ɒ n d r aɪ t / is a stony (non-metallic) meteorite that has not been modified, by either melting or differentiation of the parent body. 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Posted on NewScientist.com August 27, 2020, accessed September 3, 2020. They come from inner zones of the Solar System where temperatures would have been too high for water to condense and come together with other solids during planet formation. 2. The Earth continues to collect meteorites, the vast majority of which are about as old as our planet; indeed many are slightly older. 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. Robert J. MACKE. A new study has been published claims that a type of meteorite called an enstatite chondrite could be responsible for the abundance of water on … 86, p.11 Feb. 1992. Quick NavTop About Enstatite chondrite meteorite Classification Sub-divisions Synonyms Internet Links Recorded finds Locality List Mineral and/or Locality Mindat.org is an outreach project of the Hudson Institute of Mineralogy , a 501(c)(3) not-for-profit organization. “Our discovery shows that the Earth’s building blocks might have significantly contributed to the Earth’s water,” said Dr. Laurette Piani, a researcher at the Université de Lorraine.  Metallic Fe-Ni (iron-nickel) and Fe-bearing sulfide minerals contain nearly all of the iron in this type of meteorite. 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). ... Urs Eggenberger, “Sweating meteorites”—Water‐soluble salts and temperature variation in ordinary chondrites and soil from the hot desert of Oman, Meteoritics & Planetary Science, 10.1111/maps.12211, 48, 10, (1958-1980), (2013).