Magnetic anisotropy reveals the depositional and postdepositional history of a loess-paleosol sequence at Nussloch (Germany)
作者： Samuel N. Taylor , France Lagroix
DOI: 10.1002/2014JB011803
关键词: Paleosol 、 Pedogenesis 、 Sedimentary depositional environment 、 Population 、 Lineation 、 Diagenesis 、 Geology 、 Aeolian processes 、 Geomorphology 、 Loess 、 Geochemistry
摘要: Anisotropy of magnetic susceptibility (AMS) is employed as a tool to unravel the depositional history 17 m thick Nussloch P8 Weichselian loess sequence located 10 km south Heidelberg, Germany. Through an AMS study, primary aeolian origin fabrics evaluated, and overprinting due postdepositional reworking and/or deformation identified. Primary along are defined by near-vertical KMIN axes horizontal foliations. Eight intervals display secondary fabrics, characterized either prolate orientation distributions or oblate with dipping foliation planes. These associated laminated tundra gley horizons. It proposed that increased moisture (due higher precipitation enhanced snowmelt) repeated cryogenic processes were able reorganize rework accumulated loess. archived within 6.45 m cumulated depth 38% profile dominantly Upper Pleniglacial units. Even though maximum statistically well resolved at specimen (e12 = 10.1° ± 8.6) population (e12 = 6°) level, any inferred paleowind directions from lineation remains speculative given low concentration ferrimagnetic minerals (<0.03 wt %). Tundra horizons upprofile no major changes in degree anisotropy distributions. This suggests weakening gley-induced diagenesis therefore favorable environmental conditions needed (moisture presence permafrost active layer) initiate their formation deposits. Finally, pedogenesis has not played important role modifying fabric since paleosols same observed
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