Alteration induced changes of magnetic fabric as exemplified by dykes of the Koolau volcanic range
作者： D KRASA , E HERREROBERVERA
DOI: 10.1016/J.EPSL.2005.09.028
关键词: Geology 、 Rock magnetism 、 Hydrothermal circulation 、 Magnetic mineralogy 、 Volcano 、 Magnetic susceptibility 、 Hematite 、 Basalt 、 Geochemistry 、 Mineralogy 、 Anisotropy
摘要: Abstract We studied 93 samples from 8 basaltic dykes of the Koolau volcanic range on island Oahu,Hawaii,USA,to determine influence hydrothermal alteration magnetic fabric as determined by anisotropy susceptibility (AMS) measurements. Rock well microscopic investigations show that only ≈25% have retained their original magnetomineralogical composition unaltered Ti-poor titanomagnetite. The remaining undergone which transformed primary phase into a granular intergrowth titanomagnetite, titanomaghemite and hematite. In both sample groups,this occurs in coarse (tens microns),irregularly shaped particles interstitial clusters smaller (
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