The magnetic effects of brecciation and shock in meteorites. I - The LL-chondrites
作者： Aviva Brecher , Judy Stein , Miriam Fuhrman
DOI: 10.1007/BF00562196
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摘要: The complex brecciation and shock history of amphoterite (LL-) chondrites is well reflected in their diverse natural magnetic remanence (NRM) behavior: Most LL-chondrites have a multicomponent, undemagnetizable NRM, analogous to that lunar breccias. Only one meteorite among those studied, namely Dhurmsala (LL6), meets the criteria NRM stability directional coherence with progressive AF cleaning, indicative useful paleoremanence. Ancient field paleointensity determinations for (LL6) 0.03 0.1 Oe, agree our earlier estimates 0.01 0.08 Oe LL6 Jelica Vavilovka, respectively. In light petrographic structure, cooling rates, radiometric ages indicators, it appears likely may been thermally imprinted, during following shock-metamorphism. closely similar saturation (IRMs) behavior LL-chondrites, contrast intragroup scatter characteristics, implies - although formed by process from same starting material, suffered widely different degrees shock/metamorphic reheating.
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