Carbonates and Sulfates in CI Chondrites: Formation by Aqueous Activity on the Parent Body

Fredriksson, K.; Kerridge, J. F.

doi:10.1111/j.1945-5100.1988.tb00894.x

Cited by 155 publications

(116 citation statements)

References 25 publications

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“…Carbonates, sulfates, and sulfides are secondary minerals which precipitated from aqueous fluids on the meteorite parent bodies (e.g., Bullock et al 2005;Endress & Bischoff 1996;Fredriksson & Kerridge 1988 The patterns obtained in this study are identical to those from previous studies. Acid non-resistant species (i.e., carbonates) release 53 Cr when dissolved.…”

Section: Cr Anomalies At the Mineral Scale Of Carbonaceous Chondritessupporting

confidence: 80%

The Chromium Isotopic Composition of the Ungrouped Carbonaceous Chondrite Tagish Lake

Petitat

Birck

Luu

et al. 2011

ApJ

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Early solar materials bear a variety of isotopic anomalies that reflect compositional differences deriving from distinct stellar nucleosynthetic processes. As shown in previous studies, the stepwise dissolution with increasing acid strengths of bulk rock carbonaceous chondrites liberates Cr with both excesses and deficits in 53 Cr and 54 Cr relative to the terrestrial standard. The magnitude of the 54 Cr variations within a meteorite decreases in the sequence CI1 > CR2 > CM2 > CV3 > CO3 > CK4 and correlates with the degree of metamorphism of each carbonaceous chondrite class. This study shows that the Tagish Lake meteorite presents the highest excesses in 54 Cr ever measured in a bulk silicate phase. According to this study, the Tagish Lake meteorite is composed of the least re-equilibrated material known at this time. The magnitude of 54 Cr variation decreases now in the following sequence: Tagish Lake (ungrouped CI2) > Orgueil (CI1) > Murchison (CM2) > Allende (CV2). Moreover, this study shows that excesses in 53 Cr relative to Earth can be interpreted as representing the extent of aqueous alteration on meteorite parent bodies. Finally, the high 54 Cr anomalies measured in this meteorite make Tagish Lake one of the major targets to decipher the host of these anomalies.

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Section: Cr Anomalies At the Mineral Scale Of Carbonaceous Chondritessupporting

confidence: 80%

The Chromium Isotopic Composition of the Ungrouped Carbonaceous Chondrite Tagish Lake

Petitat

Birck

Luu

et al. 2011

ApJ

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“…As regards to relative timing of mineralisation in GRO 95577, O isotope data suggest that in contrast to QUE 93005 calcite predated the Fe-rich carbonate (siderite) (Tyra et al, 2011a), but in common with QUE 93005 petrographic results indicate that phyllosilicates crystallised after the Fe-rich carbonates (Tyra et al, 2011b). The CI meteorites contain four carbonate minerals, which in order of abundance are dolomite, breunnerite, calcite and siderite (Fredriksson and Kerridge 1988;Johnson and Prinz, 1993;Riciputi et al, 1994;Endress and Bischoff, 1996;Lee and Nicholson, 2009). The CI dolomite compositions overlap the range of Ca-poor dolomite in QUE 93005, but only partly overlap the range of its dolomite (Fig.…”

Section: Conditions Of Aqueous Alteration Of Que 93005 and The Other mentioning

confidence: 99%

Extended chronologies of aqueous alteration in the CM2 carbonaceous chondrites: Evidence from carbonates in Queen Alexandra Range 93005

Lee

Lindgren

Sofe

et al. 2012

Geochimica et Cosmochimica Acta

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The Antarctic CM2 carbonaceous chondrite QUE 93005 contains four compositionally distinct carbonates, namely breunnerite, calcite, dolomite and a Ca-poor dolomite. These carbonates can form monomineralic grains, or may be intergrown as bimineralic grains consisting of dolomite plus breunnerite and dolomite plus calcite, or polymineralic grains containing an intergrowth of breunnerite, Ca-poor dolomite and calcite. Carbonates in all grain types have inclusions of Fe,Ni sulphides and/or Mg-Fe phyllosilicates. In the bimineralic grains dolomite crystallised first to be overgrown by breunnerite or partially replaced by calcite. Polymineralic grains are concentrically layered, with breunnerite crystallising first on pore margins to be later etched, then overgrown and partially replaced by Ca-poor dolomite that was itself partly dissolved prior to being overgrown by calcite. Calcite and dolomite have also cemented fractures that cross-cut the fine-grained rims to aqueously altered chondrules and were formed by expansion of the chondrules during their hydration. Overall, the sequence of mineralisation in QUE 93005 was: (1) dolomite, (2) breunnerite, (3) Ca-poor dolomite then (4) calcite. This secular change in carbonate composition and mineralogy reflects changing solution composition and probably also provenance. Mg-Fe phyllosilicates replaced dolomite, breunnerite and Ca-poor dolomite prior to calcite crystallisation and most or all of the sulphides formed after both the phyllosilicates and calcite. Following sulphide crystallisation the edges of carbonate grains were abraded, either by impact 'gardening' or as a consequence of fluidisation of the matrix during rapid loss of gas or vapour. Determination of the crystallisation age of dolomite via the Mn−Cr system indicates that aqueous alteration of QUE 93005 began on or before 3.93 ± 0.23 Ma after the formation of the solar system. Overall, the water/rock ratio and fO 2 during alteration of QUE 93005 was similar to that of the CM1s and CR1s, but the lower degree of alteration of QUE 93005 overall suggests that alteration timescales were shorter, possibly due to loss of intergranular liquid water during fluidisation.2

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“…The CI (Dufresne and Anders, 1962;Richardson, 1978;Kerridge and Bunch, 1979;Fredriksson and Kerridge, 1988;Tomeoka and Buseck, 1988;Brearley and Prinz, 1992;Brearley and Jones, 1998;Johnson and Prinz, 1993;Zolensky et al, 1993;Endress et al, 1996).…”

Section: Origin Of Sulfatementioning

confidence: 99%

Planetesimal sulfate and aqueous alteration in CM and CI carbonaceous chondrites

Airieau

Farquhar

Thiemens

et al. 2005

Geochimica et Cosmochimica Acta

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Carbonates and Sulfates in CI Chondrites: Formation by Aqueous Activity on the Parent Body

Cited by 155 publications

References 25 publications

The Chromium Isotopic Composition of the Ungrouped Carbonaceous Chondrite Tagish Lake

The Chromium Isotopic Composition of the Ungrouped Carbonaceous Chondrite Tagish Lake

Extended chronologies of aqueous alteration in the CM2 carbonaceous chondrites: Evidence from carbonates in Queen Alexandra Range 93005

Planetesimal sulfate and aqueous alteration in CM and CI carbonaceous chondrites

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