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Magnetic Fabric of Late Devonian Metasedimentary Rocks from Longyan,Southwestern Fujian ,China
Ist Teil von
地球科学学刊：英文版, 1993 (1), p.100-106
Erscheinungsjahr
1993
Link zum Volltext
Beschreibungen/Notizen
This study presents the results of magnetic fabric on Late Devonian metasedimentary rocks fromLongyan,Southwestern Fujian,China.Measurements of low—field anisotropy of magnetic susceptibili-ty(AMS)were made on 59 specimens(sites 48—53)using a Sapphire SI—2 induction coil instru-ment.Our data show that the magnetic fabric at sites 48—51 and 53 is mainly carried by paramagneticminerals(muscovite,chlorite and biotite),while at site 52 both paramagnetic minerals and hematite con-tribute to the total AMS.Separation of the two components of anisotropy indicates that they areapproximately coaxial.The magnetic foliation is either parallel to an Indosinian(Late Triassic)metamorphic schistosity(sites 48—52)or to a Yanshanian(Late Mesozoic)microscopicmylonitic foliation(site53).The magnetic lineation corresponds either to the regional structural trend(sites48—52)or to the line of intersection between the schistosity and the mylonitic surface(site 53 ).Our re-sults suggest that Indosinian metamorphism and def