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Chondrules and Their Origins. Subject Index 359 1983chto.conf..359. SUBJECT INDEX Ablation spherules 21 formation 46, 50 as chondrule analogs 11, 22 internal isochrons 251, 256 composition 14, 15, 17, 18 iodine-xenon dating 256 formation 11-14, 19 matrix ages 257 grains 13, 14 metamorphic structure 47 iron 14 origin 50 magnetic properties 15 photomicrographs 47 matrix 13 potassium-argon dating 251 melting 19, 21, 22 texture 44 metals 19 ultrathin sections 47 mineralogy 19 Allende chondrules photomicrographs 13 ages 247-251,253,255-257 porphyritic 21 alteration 159 siderophiles 15-19 cavities 155-157, 159 texture 19 classification 207 thermal effects 12-14 composition 42, 93, 156, 157 volatiles 13, 14 EPMA 93 Aerodynamic spherules extraction temperature 254 as chondrule analogs 10, 12 formation 160 composition 12 iodine 254, 256, 257 formation 12 iodine-xenon 258 thermal effects 12 isochrons 254 Age dating techniques 257 isotopes 37, 39-42, 270 iodine-xenon 246, 247 mineralogy 93, 149-152, 154, 155, 158, 160 isochrons 257 mixing line 41 metamorphic processes 257 opaque inclusions 155, 159 potassium-argon 246, 247 photomicrographs 148, 150, 151, 154, 156, rubidium-strontium 246, 247 157 uranium-lead 246, 247 precursors 42 Ages of chondrules sample analysis 39 iodine-xenon 246, 247, 251-257 SEM studies 150, 151, 152, 154, 156, 157 potassium-argon 246, 247, 250, 251, 257, 258 texture 39, 41, 155 rubidium-strontium 246-250, 258 thermal history 255 uranium-lead 246-248, 258 xenon closure 254 Allegan Allende inclusions 145 bulk analysis of chondrules 48, 49 ages 255 chemistry 46 initial iodine 256· chondrule ages 251, 256, 257 iodine-xenon dating 255 chondrule oxygen isotope analysis 40 isochrons 255 chondrules 44, 47 isotope analysis 39 classification 46, 50 sample analysis 39 composition 46 texture 39 description 46 Allende matrix 145, 257 equilibration 44, 50 alteration 159 © Lunar and Planetary Institute • Provided by the NASA Astrophysics Data System 360 Chondrules and their Origins 1983chto.conf..359. composition 145, 146, 159 Barred olivine chondrules formation 145,147,159,160 ages 251 mineral composition 152, 153, 159 chondrule formation 126 photomicrographs 153 classification 95 SEM studies 152, 153 composition 95-97, 100, 113, 126, 129 Allende meteorite cooling rates 126 analysis of chondrules 38 INAA data 113 analysis of inclusions 38 lithophiles 96 bulk silicates 38 melting 125 CAI mixing line 38 microprobe data 113 chondrule formation 145 mineralogy 95, 97 chondrule intercrystalline pores 326 Na/ Al ratios 113 chondrule vesicles 322-325, 327 petrography 97 chondrule-matrix interface 152-154, 160 refractory elements 95, 97 chondrules see also Allende chondrules siderophiles 95, 96 composition 146, 159 spherules 125 electric discharge experiments 279 texture 95, 125, 126 evaporation experiments 181, 182 thermal history 126 fusion experiments 181, 182 Barwell meteorite inclusion ages 251, 255 chondrule ages 248, 250 inclusions seeAllende inclusions internal isochrons 248, 250 internal isochrons 247-251, 253, 256 potassium-argon dating 250 iodine-xenon dating 253, 256 uranium-lead dating 248 matrix see Allende matrix Beardsley meteorite melt bead composition 183 chondrule vesicles 320, 321 opaque inclusions 146, 147, 159 porosity of chondrules 319, 320 oxygen isotope analysis 38 Bishunpur petrography 146 matrix composition 165-167, 170, 171 porosity of chondrules 319 Bishunpur chondrules po~ium-argon dating 251 EPMA 93 rubidium-strontium dating 249 matrix composition 164-167, 170, 171 sample analysis 38, 184 matrix origin 170 SEM studies 147, 148, 149, 152 Bjurbole chondrules silicon isotope analysis 38 ages 249, 251, 253 spherule abundance 16 density 63, 79 uranium-lead dating 247, 248 EPMA 93 Analogs of chondrules 129 extraction temperature 254 in lunar samples 263-266 formation time 253 spherules 10, 122, 239 iodine composition 253, 254 Antarctic meteorites iodine-xenon chronometer 258 ALHA 76004 37 isochrons 254 ALHA 77015 215, 216, 217 isotopic features 29 ALHA 77278 215, 216, 217 NAA 92 ALHA 77299 213 petrology 92 Allan Hills meteorites 212, 213 trapped xenon 253, 254 Yamato 74191 93 Bjurbole meteorite age differences 257 © Lunar and Planetary Institute • Provided by the NASA Astrophysics Data System Subject Index 361 1983chto.conf..359. chondrules see Bjurbole chondrules refractory abundance 99 impact experiments 192 CO3 chondrite chondrules internal isochrons 249, 251, 253 chemistry 94 iodine-xenon dating 251, 253 EPMA 94 isotopes 73 isotopic dilution 94 potassium-argon dating 251 NAA 94 rubidium-strontium dating 249 petrography 94 Bovedy meteorite CV chondrite chondrules anorthositic inclusion 168, 169 composition 97, 99 Bremervorde meteorite lithophiles 97, 99 porosity of chondrules 319 CV chondrites silica-bearing chondrules 231 abundance of chondrules 89, 99 Brownfield meteorite alteration 146 cadmium isotopes 73 composition 89, 100, 115 Bruderheim meteorite refractory abundance 99 chondrule ages 256 CV3 chondrite chondrules internal isochrons 256 chemistry 94 iodine-xenon dating 256 EPMA 94 isotopes 73 isotopic dilution 94 C2 cbondrites NAA 94 isotopic fractionation 142 petrography 94 Murchison 223 CV3 meteorites oxygen isotopes 3 7 alteration 146 C3 chondrites opaque assemblages 146 isotopic fractionation 142 Campo del Cielo meteorite oxygen isotopes 37 FeO in inclusions 311 CAi's Cape York meteorite 160 variations 37 formation 176 mixing lines 41 isotopic closure 176 oxygen isotope composition 41 Carbonaceous chondrite chondrules CAT spheres 15 ages 251 formation 14 analysis 195-197 CI chondrites 16 bulk ratios 99 abundance of chondrules 89 chalcophiles 99 alteration 146 chemistry 94, 96, 97,208,209 composition 89 classification 90, 97, 196, 198-205, 207-209 spherule abundance 17 composition 88, 99, 100, 197-199, 201, CM chondrites 16 205-207 abundance of chondrules 89 discriminant analysis 202, 204, 205 alteration 146 EPMA 93,94 composition 89 factor analysis 201-204 CO chondrite chondrules formation 109 composition 97, 99 isotopes 94, 208 lithophiles 97, 99 isotopic anomalies 141, 142 CO chondrites isotopic dilution 94 abundance of chondrules 89, 99 matrix 109, 208 composition 89, 100, 115 metals 109 © Lunar and Planetary Institute • Provided by the NASA Astrophysics Data System 362 Chondrules and their Origins 1983chto.conf..359. mineralogy 196, 198-201, 205 iron concentration 72 multiple 208 matrix ages 257 NAA 94 petrogenetic properties 61 origin 38 potassium-argon dating 251 oxides 198-200, 204-206 rubidium-strontium dating 249 petrography 94, 96, 97,205 Chen meteorite precursors 42 chondrule ages 248 redox state 198-200, 204, 209 internal isochrons 248 siderophiles 99 uranium-lead dating 248 sorting 208 Chondrite meteorites texture 97, 196, 205 abundance of chondrules 89 Carbonaceous chondrites 5 brecciation 44-46 alteration 146, 147 classification 45, 89, 319 chondrules see Carbonaceous chondrite composition 45, 49, 50, 98 chondrules crystallinity 44-46 classification 89 equilibration 44-46,48-50 composition 89, 91 metamorphism 44-46 multiple chondrules 197 morphology 319 porosity 322, 328 porosity of chondrules 319 refractory-rich objects 91 recrystallization 44 spherule abundance 17 solidification 44 temperature of formation 4 Chondrule ages see Ages of chondrules volatiles 322 Chondrule analogs see Analogs of chondrules Chainpur chondrules Chondrule composition see Composition of ages 249,251,256,257 chondrules bulk composition 72 Chondrule formation see Formation of chalcophiles 103, 104, 110 chondrules classification 66 Chondrule origin see Origin of chondrules composition 71, 74-77, 83, 103, 104, 107, Chondrule precursors see Precursors of 112 chondrules EPMA 93 Chondrule properties see Properties of factor analysis 110 chondrules formation 110 Chondrule types see type names lithophiles 104, 110 Composition of chondrules 89, 110, 267 microcraters 266 agglutinate abundance 265 NAA 92 Al/ Ca ratio 98 petrology 92 alteration 296 physical properties 80-82 aluminum content 104 precursor material 110 Au/Ir 107 rim composition 164 Ca-Al inclusions 147, 299 siderophiles 103, 104, 110 Ca/ Al ratios 111, 112 texture 66, 92 chalcophiles 101 Chainpur meteorite chemistry 95-97, 101, 108, 114, 115, 165 cadmium isotopes 73 clinoenstatite 145, 147 chondrules see Chainpur chondrules Co enrichment 76, 77 internal isochrons 249, 251, 256 critobalite 55, 56, 240 iodine-xenon dating 256 © Lunar and Planetary Institute • Provided by the NASA Astrophysics Data System Subject Index 363 1983chto.conf..359. element abundance 61, 92, 96, 97, 101, 112, silica-bearing chondrules 231 116,271 Droplet chondrules EPMA 92,111,112 crystallization 219 enrichment 61 formation 166, 219 Eu anomalies 114 in Manych 166, 167 Fe-rich olivine 145, 147 mineral composition 167 FeO content 315 Na/Al ratios 166, 167 INAA 111,112 silicate liquids 166 in Sharps 315 texture 123 in Tieschitz 315 see also Melt droplet chondrules iron 72, 116 Dust aggregates isotopes 61, 64, 73, 114 chemistry 26 lithophiles 88, 96, 100, 101 formation 26, 35 metal 1, 6, 226, 227 isotopes 26, 29 minerals 296, 299 lead/uranium ratio 29 NAA 92 refractory elements 26 Na/Al 107 structure 26 Ni-Fe composition 76, 77 Dusty inclusions olivine 78, 83, 214, 226 chondrule analogs 122 opaque assemblages 147 chondrule formation 122-125, 127, 131, oxygen isotopes 37, 72, 243-245, 262, 269, 217 270,272,273 chondrule texture 125, 127 petrography 92, 95-97 composition 124, 126, 131 pyroxene 78,226,227 cooling rates 125-127, 129, 131, 217 rare earth elements 61, 74-77, 92, 114,271 dendrite widths 124, 125 relic minerals
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