Mineralogy of Tagish Lake: An ungrouped type 2 carbonaceous chondrite
摘要:
Abstract— In this paper we describe the recovery, handling and preliminary mineralogical investigation of the Tagish Lake meteorite. Tagish Lake is a type 2 carbonaceous chondrite which bears similarities to CI1 and CM chondrite groups, but is distinct from both. Abundant phyllosilicates as well as chondrules (however sparse) and common olivine grains in the matrix preclude any other classification. The bulk density of Tagish Lake (1.67 g/cc) is far lower than CI or CM chondrites (2.2‐2.3 and 2.6‐2.9 g/cc, respectively), or any other meteorite for that matter. We have identified two lithologies: a dominant carbonate‐poor lithology and a less‐abundant carbonate‐rich lithology. The meteorite is a breccia at all scales.We have noted similarities between Tagish Lake and some clasts within the enigmatic meteorite Kaidun; possibly there are genetic relationships here worth exploring. In the paper we describe a clast of CM1 material within Tagish Lake which is very similar to a major lithology in Kaidun.
Mineralogy of Tagish Lake: An ungrouped type 2 carbonaceous chondrite
摘要:
Abstract— In this paper we describe the recovery, handling and preliminary mineralogical investigation of the Tagish Lake meteorite. Tagish Lake is a type 2 carbonaceous chondrite which bears similarities to CI1 and CM chondrite groups, but is distinct from both. Abundant phyllosilicates as well as chondrules (however sparse) and common olivine grains in the matrix preclude any other classification. The bulk density of Tagish Lake (1.67 g/cc) is far lower than CI or CM chondrites (2.2‐2.3 and 2.6‐2.9 g/cc, respectively), or any other meteorite for that matter. We have identified two lithologies: a dominant carbonate‐poor lithology and a less‐abundant carbonate‐rich lithology. The meteorite is a breccia at all scales.We have noted similarities between Tagish Lake and some clasts within the enigmatic meteorite Kaidun; possibly there are genetic relationships here worth exploring. In the paper we describe a clast of CM1 material within Tagish Lake which is very similar to a major lithology in Kaidun.
Synthesis of ketones and tertiary alcohols from trialkylboranes. Use of lithium tris(phenylthio)methanide
作者:Andrew Pelter、J. Madhusudhana Rao
DOI:10.1039/c39810001149
日期:——
The interaction of lithium tris(phenylthio)-methanide with trialkylboranes followed by oxidation allows the production of ketones or tertiary alcohols in good yields under mild conditions.
Lithium tris(phenylthio)methane for the homologation of trialkylboranes: Convenient syntheses of ketones and t-carbinols
作者:Andrew Pelter、J.Madhusudhana Rao
DOI:10.1016/0022-328x(85)87357-5
日期:1985.4
Lithium tris(phenylthio)methane is a readily available, cheap reagent for the production of ketones and t-carbinols from trialkylboranes. The scope and limitations of the reactions are indicated as are some of its unique features.