Landsat linear features: an example of application to structural-geomorphologic analysis in the Campanian Apennines

Abstract

Studies carried out on gravity cores collected in the Joides Basin during the X^th and XI^th Antarctic expeditions of «Programma Nazionale di Ricerche in Antartide», in the framework of the «Glaciologia e Paleoclima » Project were addressed to identifying the effects of by West Antarctic Ice Sheet advance in the Last Glacial Maximum (Lgm). The Western Ross Sea continental shelf is characterized by a series of northeast- southwest trending banks and basins. The Joides Basin is one of these depressions. It is characterized by a rim near the continental shelf break that is higher than the center of the basin. High resolution geophysical surveys were conducted in the study area t0 show the geometry and seismostratigraphy of the upper meters of superficial sediments. These studies al- Towed us to locate the sampling sites. 13 gravity cores were collected during the two Antarctic Expeditions for sedimentological and geotechnical studies. The sedimentation patterns of the Ross Sea continental shelf, as described in literature and obtained by laboratory testing and campaign results, show many glacial erosion surfaces and relative overlying sediments. ‘The sedimentary sequence following the last glacial event consists of two facies overlying the basal till: marine sedimentation, composed of fine, mostly clayey sediments with limited internal unconformities; glaciomarine deposits characterized by glaciomarine sediments (diamicton) of variable thickness; below this deposit, the sediments are represented by a basal till of variable and not easily quantifiable thickness. The basal till is characterized by unstratified sediments, with mixed texture, low water content and overconsolidation. The first results from the cores collected show that the characteristics of the sediments vary according to the location of the sampling site. Geotechnical characterisation of the sediments also highlights the peculiar sedimentation environment and the presence of overconsolidation phenomena that may be due to the presence of a grounding ice sheet during the Lgm, in a site very close to the shelf break.