Usnm 3515: an Allende Cai with Li Isotopic Variations

DISCOVERY OF NEW MINERAL BUTIANITE, Ni6SnS2, AN ALTERATION PHASE FROM ALLENDE

Introduction: During an ongoing nanomineralogy investigation of the Allende CV3 meteorite, a new mineral, Ni6(Sn,Ge)(S,Te)2, was identified in fractures in a Type B1 Ca-Al-rich refractory inclusion (CAI) ACM-2, named “butianite”. Synthetic Ni6SnS2 is well known [1]. Presented here is the first natural occurrence of Ni6SnS2, as a new alteration mineral in a CAI from a primitive meteorite. Field-...

Elemental and Isotopic Abundances of Lithium in Chondrule Constituents in the Allende Meteorite

ALLENDE METEORITE. T. Kunihiro, S. Maruyama, M. Watanabe, and E. Nakamura, The Pheasant Memorial Laboratory, Institute for the Study of the Earth’s Interior, Okayama University, Japan ([email protected]) Introduction: Most carbonaceous and ordinary chondrites—long touted as primordial material and relatively unchanged since their formation—have been altered by interaction with aqueous ...

Oxygen reservoirs in the early solar nebula inferred from an Allende CAI.

Ultraviolet laser microprobe analyses of a calcium-aluminum-rich inclusion (CAI) from the Allende meteorite suggest that a line with a slope of exactly 1.00 on a plot of delta (17)O against delta (18)O represents the primitive oxygen isotope reservoir of the early solar nebula. Most meteorites are enriched in (17)O and (18)O relative to this line, and their oxygen isotope ratios can be explaine...

High Precision Magnesium Isotopic Measurement of Cai Minerals with Low Al/mg Ratio from Allende Utilizing a Nanosims 50l Ion Microprobe

Oxygen Isotope Measurements of a Rare Murchison Type a Cai and Its Rim

Introduction: Ca-, Al-rich inclusions (CAIs) from CV chondrites commonly show oxygen isotope heterogeneity among different mineral phases within individual inclusions reflecting the complex history of CAIs in both the solar nebula and/or parent bodies [1]. The degree of isotopic exchange is typically mineralspecific, yielding O-rich spinel, hibonite and pyroxene and O-depleted melilite and anor...