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Meteorites Fragments of the Solar System. Dedicated to Dr. Elbert King –First director of the Lunar Receiving Lab –Recovered a lot of Allende!! –Meteoriticist.

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Presentation on theme: "Meteorites Fragments of the Solar System. Dedicated to Dr. Elbert King –First director of the Lunar Receiving Lab –Recovered a lot of Allende!! –Meteoriticist."— Presentation transcript:

1 Meteorites Fragments of the Solar System

2 Dedicated to Dr. Elbert King –First director of the Lunar Receiving Lab –Recovered a lot of Allende!! –Meteoriticist

3 Meteorites Meteoroids –small rocks orbiting in space Meteors –rocks entering the atmosphere and glowing –Most are the size of a grain of sand –Some are a lot bigger!!! Meteorites –Rocks from space that have hit the Earth

4 Thunderstone of Ensisheim 1492

5 Thunderstone of Ensisheim Whats left of it

6 What Holbrook supposedly looked like 1946

7 Famous painting of the Shikote-Alin meteorite on a USSR postage stamp.

8 Meteorites Irons iron + nickel Stoney Irons –Mesosiderites MES silicate + iron –Pallasites PAL iron + silicate (olivine) Stoney –Chondrites silicate + some iron (sometimes) Ordinary ChondritesH, L, LL Carbonaceous Chondrites C, CO, CV, CM, CK Others – Enstatite Chondrites E – Rumruti R –Achondrites HED – from Vesta SNC – from Mars ALUN – from the Moon

9 Irons Cape York – discovered by Peary from Greenland actually discovered by local Inuit

10 Irons

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12 Witmanstatten Patterns Gibeon

13 Irons Willamette

14 Irons Hoba – 60 tons Campo del Cielo

15 Stony Irons Mesosiderites - MES Silicate based – with a lot of metal running through it. NWA1879

16 Stoney Irons Another mesosiderite -MES

17 Stoney Irons Mesosiderite Morristown

18 Stoney Iron Pallasites Iron based – with olivine crystals sprinkled through Thought to be from the core- mantle boundary of the parent asteroid

19 Stoney Iron Pallasite – lit from behind

20 Stoney - Chondrites Ordinary Chondrites –H (High Metal) – L (Low Metal) – LL (Very Low Metal) Inside (Brecciated) Outside (Crusted) Probably a L4-5 – this comes from NWA – Morocco

21 Chondrules / Chondrites

22 Stoney - Chondrites Carbonaceous chondrites –Residue from the formation of the Solar System – 4.5+ Billion Years old Allende – CV3.2 Murcheson – CM2

23 Stoney - Achondrites HED Howardite DAG 844 Meteorites from Asteroid 4 Vesta

24 Stoney - Achondrites HED Eucrite Millbillillie

25 Stoney - Achondrites HED Diogenite Johnstown

26 Stoney - Achondrites SNC Shergottite Zagami Meteorites from Mars

27 Stoney - Achondrites SNC Dhofar 019 DAG 476

28 Stoney - Achondrites ALUN DAG 400 Meteorites from the Moon

29 How do we know they are from Mars / the Moon / 4 Vesta?? Mars: Viking 1 and 2 had soil and atmosphere analyzers. The percentages of the elements and isotopes are the same as the SNC meteorites – and different from others! The Moon: Same story – except we have real moon rocks to compare them to Vesta: Spectroscopy of Vesta indicates it is made of HED materials, and no other asteroid is. Recent studies show a great crater on Vesta where some of these materials must have been ejected from.

30 How to Study Meteorites What does it look like (big picture) What does it look like (microscope) What elements are in it (chemistry and microprobe) What isotopic ratios are there (microprobe) Where did it come from (compare to asteroids and planets) How did it fall (distribution)

31 Meteorites / Meteorwrongs Meteorites are not hot when they hit the earth! Almost all meteorites are magnetic! Almost all meteorites have some visible metal (though sometimes only a little). Most meteorites are denser than local rocks. Meteorites dont have holes/bubbles in them. For real analysis you have to take it to an expert

32 How to Study Meteorites Thin Sections – The coolest way to look at meteorites is in thin section. Take a thin slice of the rock, glue it to a microscope slide and grind/polish it until it is 30 micrometers thick. You can then look at it under a petrographic microscope with crossed polarizing filters. The colors tell you the minerals!

33 Eucrite Enstatite

34 Richfield LL3.7

35 Pultusk

36 SNC

37 Some chondrules in thin section

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40 Eucrite thin section Looks a lot like Kilauea basalts!

41 Apollo 17 Basalt

42 Apollo 12 Basalt

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46 Impact!!! When a Big rock hits – 50 meters or more – it can make a rather big hole in the ground!!!!

47 Meteor Crater

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49 Wolf Creek

50 Lake Manicoagan

51 Chixilub

52 Brent Crater

53 Pretoria Saltpan

54 Sudbury + Lake Wanapitei

55 Disclaimer Aloha I put together these power points for use in my science classes. You may use them in your classes. Some images are public domain, some are used under the fair-use provisions of the copyright law, some are mine. Copyright is retained by the owners! Ted Brattstrom


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