Download - Water in Meteorites
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Water in Meteorites
Mike ZolenskyNASA JSC
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CI CM CO CV CB/CH CR Tagish Lake
Serpentines Saponite
Serpentines Chlorite Vermiculite Garnets
Serpentine Chlorite
Serpentines Chlorite Micas Amphiboles GarnetsFayalite Hedenbergite
Serpentine Serpentine Saponite
Serpentine Saponite
Calcite Dolomite Breunnerite Siderite
Calcite Dolomite Aragonite
Calcite Calcite Dolomite Breunnerite SideriteMagnesite
Pyrrhotite Pentlandite Cubanite
Pyrrhotite PentlanditeTochlinite
Pyrrhotite Pentlandite
Pyrrhotite Pentlandite
Pyrrhotite Pentlandite
Sulfur Awaruite
Apatite Merrilite
Magnetite Magnetite Magnetite Magnetite Magnetite
Brucite Tochilinite
Halite
Sulfates??? Sulfates??? NO SULFATES
Aqueous alteration phases found in C Chondrites
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Silicates
Serpentine in Essebi C2 Saponite in Kaidun
Serpentine in Maribo CM2 Garnet in Kaidun
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Carbonates
Aragonite in Boroskino CM2 Calcite in Al Rais CR2
Calcite in Maribo CM2 Calcite in Kaidun
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Sulfides
Pyrrhotite/Pentlandite in Y82162 Meta CI Pyrrhotite in Tagish Lake C2
Tochilinite in Maribo CM2 Pyrrhotite in Y75273 LL3
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Various
Apatite and Magnetite in Maribo CM2
Gypsum in Alais CI1 Awaruite in Kaidun
Halite in Zag H3-5
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CI CM CO CV CB/CH CR Tagish Lake
Serpentines Saponite
Serpentines Chlorite Vermiculite Garnets
Serpentine Chlorite
Serpentines Chlorite Micas Amphiboles GarnetsFayalite Hedenbergite
Serpentine Serpentine Saponite
Serpentine Saponite
Calcite Dolomite Breunnerite Siderite
Calcite Dolomite Aragonite
Calcite Calcite Dolomite Breunnerite SideriteMagnesite
Pyrrhotite Pentlandite Cubanite
Pyrrhotite PentlanditeTochlinite
Pyrrhotite Pentlandite
Pyrrhotite Pentlandite
Pyrrhotite Pentlandite
Sulfur Awaruite
Apatite Merrilite
Magnetite Magnetite Magnetite Magnetite Magnetite
Brucite Tochilinite
Halite
Sulfates??? Sulfates??? NO SULFATES
Aqueous alteration phases found in C Chondrites
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Hydrous Chondritic IDPs
Chondritic Micro-meteorites
Ureilites E LL, H
Serpentines Saponite
Serpentines Saponite
Serpentine Saponite Amphiboles Silica
Smectite
Carbonates Carbonates Calcite Calcite
Pyrrhotite Pentlandite
Pyrrhotite Pentlandite
Pyrrhotite Pyrrhotite Pentlandite
Magnetite? Magnetite Magnetite
Phosphates
Halite
Aqueous alteration phases found elsewhere
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Kaidun
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Diopside, Augite, Anorthite, Ilmenite,Actinolite, all Verified by EBSD
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Calcite, Anorthite, Heideite, Ilmenite, Non-crystalline phase with Enstatite composition, Silica (indexes as either cristobalite and tridymite)All Verified by EBSD
Aqueously altered Enstatite chondrite or Achondrite
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Resembles a hot spring deposit
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Foreign Clasts in Meteorites
Maribo CM
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Foreign Clasts in Meteorites
• Most prevalent in HEDs, OC, CCs
Jodzie HowarditeY7740 Eucrite
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XX
X XX
XXXX X
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Foreign Clasts in Meteorites
• Most prevalent in HEDs, OC, CCs• We have analyzed these in over 75 different
meteorites• Most are “water”-bearing• The PRA 04401 Howardite contains ~40% CM
chondrite, suggesting ~ 1 wt % “water” content in this HED meteorite
• This much water might be visible from orbit, if not directly then by leveraging the 0.7 um ferrous/ferric feature
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Alteration Location(1) Reaction of anhydrous, high-temperature condensates with water vapor as the solar nebula cooled to the condensation temperature of water ice (~160 K at P ~10–6 bar, e.g., Cyr et al., 1998; Drake 2005)
(2) Hydration of silicate dust in the solar nebula during the passage of shock wavesthrough regions of elevated ice/dust ratios (Ciesla et al., 2003)
(3) Alteration within small water-bearing protoplanetary bodies that were later disrupted and their altered components dispersed and then accreted with unaltered materials into the final asteroidal s (preaccretionary alteration) (e.g., Metzler et al., 1992; Bischoff, 1998)
(4) Parent- body alteration model in which aqueous alteration occurs entirely during and/or after asteroidal accretion (DuFresne and Anders, 1962; Kerridge and Bunch, 1979; Zolensky and McSween, 1988)
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Evidence for Parent Body Alteration
Mineral Textures
Veins of aqueous alteration products require a parent body origin
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Veins
Nogoya CM2
EET 92005 CM2 Kaidun
Allende CV3
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Subsequent Thermal Metamorphism can obscure the alteration record
Allende CV3
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Evidence for Parent Body Alteration
Mineral Textures
Veins of aqueous alteration products require a parent body origin
Fe-rich aureoles around some metal grains, carbonates, chondrules, etc, that incorporate nearby objects
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Rims
Y75273 (LL3)
EET 92005 CM2
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Evidence for Parent Body Alteration
Mineral Textures
Veins of aqueous alteration products require a parent body origin
Fe-rich aureoles around some metal grains, carbonates, chondrules, etc, that incorporate nearby objects
Similarities of bulk compositions of matrix and chondrule rims in the same meteorite are most consistent with a parent body origin
Presence of aqueous fluid inclusions is most indicative of large quantities of liquid water relatively long periods of time
Fluid inclusion-bearing halides (halite/sylvite) require leaching of large quantities of rock
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Evidence for Parent Body Alteration
CI chondrite bulk composition
Similarity of the bulk composition of CI chondrites to bulk solar values suggests closed system alteration, which is most compatible with a parent body location (Anders and Grevesse, 1989)
Refractory and moderately volatile alkalis and alkali earths such as K, Na, Ca, Rb, and Sr, as well as the rare earth elements, have variable solubilities in aqueous fluids and are leached at different rates from carbonaceous chondrites, so alteration in anything other than a closed system on an asteroidal parent body would invariably cause fractionation of these elements from one another, as well as from less-soluble elements such as Ti and Al.
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Timing of alteration
• Early. In the first 20my of solar system history
• Mineralogy tells us that the alteration was episodic
• The effects of aqueous alteration were sometimes erased by subsequent thermal metamorphism, so the alteration occurred during the pro-grade phase of thermal metamorphism
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CONDITIONS OFAQUEOUS ALTERATION
• fO2– Many calculations have been made based on the
assumption that sulfates are indigenous, so these calculations are probably Wrong
• Temperatures based upon mineralogy:– CI: 50-150C– CM: 0-120C– CV: 50-350C– LL: <260C
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CONDITIONS OFAQUEOUS ALTERATION
• Water-rock ratios– Calculations are generally in the range 0.1-1
• pH– All are alkaline: 7-12, mainly owing to the
formation of serpentine and saponite from precursor silicates
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Direct water samples
• Aqueous fluid inclusions were reported in the 1970s in an ordinary chondrites (Jilin) by Ed Roedder
• But there was zero work on these inclusions, which were subsequently lost and consumed for chronological analyses (here in Paris!)
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Direct water samples• We have aqueous fluid inclusions in carbonates
in CI1 (Ivuna) and CM2 (Murray, Sayama)• But there is no work on these inclusions to date
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Direct water samples• We have aqueous fluid inclusions in halite in two H chondrites
(Monahans H5 and Zag H3-5)• We have trapping temperatures (~25C)• We have O and H isotopic measurements of the water (Yurimoto-
san’s talk)• We have mineralogical analyses of associated solid inclusions
(reported at MetSoc 2011)• We will soon have trace
element compositions of the halides (by ICPMS
• These data all tell us that these halite crystals did not derive from the H5 parent asteroid(s)
• So, where did they come from?Fluid Inclusions in Zag (H3-5) halite
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Maybe Cryovolcanism involving brines?