Classification of Stony Meteorites

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Presentation transcript:

Classification of Stony Meteorites EL (0.8%) - opx, no oliv Enstatite - 18% Feo (1.6%) EH (0.8%) - opx, no oliv - 25% Feo H (30%) - 15% Feo Ordinary (78%) L (40%) - 6% Feo Chondrites (85-87%) LL (7%) - 3% Feo - chondrules - oliv, opx, Feo CV (1%) - volatile depleted - refractory lithophile enriched - refractory inclusions CO (1%) - volatile depleted STONES Carbonaceous - matrix < 30% < 30% Feo (4.8%) CM (2%) - slight volatile depletion (94-97%) - matrix > 30% CI (0.8%) - volatile-rich - hydrated silicates - no oliv or chondrules Aubrites - enstatite & Fe alloy Ureilites - shock-melted carbonaceous chondrites? (0.4%) - olivine + Fe alloy, diamonds Achondrites Lunar - feldspar breccia (10-12%) SNC - basaltic to ultramafic composition (1%) - shocked, young (1.4 bys) - Martian rare-gas isotopic ratios Eucrites - basaltic composition (2.8%) - largely of opx & felds - assoc: diogenites (opx) & howardites (breccias) - old (4.5 bys)

Allende

Chondrite 32% Feo core + 68% mantle

15 – 20 % melting MgO = 37.8 Al2O3 = 4.4 SiO2 = 45.0 CaO = 3.5 FeO = 8.1 Total = 98.8

Primitive mantle: MgO = 37.8 Al2O3 = 4.4 SiO2 = 45.0 CaO = 3.5 FeO = 8.1 Total = 98.8 Olivine ~ 55 % Orthopyroxene ~ 30 % Clinopyroxene ~ 15 %

MgO = 37.8 Al2O3 = 4.4 SiO2 = 45.0 CaO = 3.5 FeO = 8.1 Total = 98.8

Mg2SiO4 Y / T = 2 MgSiO3 Y / T =1 MgO = 37.8 Al2O3 = 4.4 SiO2 = 45.0 CaO = 3.5 FeO = 8.1 Total = 98.8

Ocean Crust Continental Crust Mantle

? (Mg,Fe)3Al2(SiO4)3 Si = 3/8 or 37.50 Al = 2/8 or 25.00 NaAlSi3O8 MORB ? (Mg,Fe)2SiO4 Si = 1/3 or 33.33 (Mg,Fe)SiO3 Si = 1/2 or 50.00

Chemical Probes MORB Hot-Spot convecting upper mantle Lower mantle ?

Source of Modern Hot-Spots ?

Exchange between the Mantle and Core ? 2(Mg,Fe)OMw FeOliq alloy + MgOMw 2(Mg,Fe)SiO3Pv MgSiO3Pv + SiO2 + FeOliq alloy (Fe1-x,Mgx)SiO3Pv + 3(1-x)Feliq alloy xMgSiO3Pv + (1-x)FeOliq allo+ (1-x)Fe3Siliq alloy oxidation of the mantle over time? 3Fe2+OMw or Pv Feoliq alloy + Fe3+2O3perovskite

In the beginning ?

Mg# ~ 0.86

MORB