IzvlečekUDK 551.435.8(450.52) Giampaolo Mariannelli & Leonardo Piccini: Razvoj površin-ske in podzemne odtočne mreže na kraških območjih Corfino in Sorragio Pania di Corfino in Ripa di Soraggio sta dva manjša kraška območja v Toskani. Površine območij znašajo 11 km 2 , vendar je na nji� znani� preko 100 jam. Obstoj stari� epifreatični� galerij priča o nezveznem zniževanju nivoja erozijske baze dolin rek Serc�io di Soraggion in Fiume, ki sekata karbonatno območje na SZ oziroma JV meji masiva. Glavne jame so razporejene v višinskem obsegu 500 m. Povezava leg jam in položaja aluvialni� sedimentov, nam je omogočila sklepanje o razvoju območja v poznem kvartarju. če predpostavimo odlaganje fluvialnega gradiva v mrzli� obdobji� in vrezovanje rečni� dolin v topli� obdobji�, la�ko sklepamo, da so nezvezno razporejeni epifreatični rovi nastali ob pre�odi� iz enega v drugo obdobje. Poleg tega je na razvoj jamski� sistemov vplivala tudi preureditev rečne mreže ob tektonskem dvigu. Strukturnomorfološki pogoji so narekovali razvoj podzemnega odtoka skozi masiv, preko katerega so površinski vodotoki z ene strani masiva napajali vodotoke na drugi strani, ki so se posledično �itreje urezovali. Ves proces je napredoval gorvodno in ustvaril niz stari� ponorov, izvirov in pripadajoči� fosilni� jamski� galerij. Ključne besede: kras, speleogeneza, reliktne jame, Pania di Corfino, severni Apenini. The Pania di Corfino and Ripa di Soraggio are two minor karst areas in Tuscany, �aving a surface of only 11 km 2 , but contain more t�an 100 known caves. Some caves are old epi-p�reatic passages testifying to a discontinuous lowering of base level in t�e two major valleys t�at cross t�e carbonate outcrops: t�e Serc�io di Soraggio and t�e Fiume rivers, respectively located along t�e Nw and SE borders of t�e massif. The spatial-altimetric distribution of major caves, w�ic� are found on a vertical range of a few �undreds of meters, and t�eir relations�ips wit� t�e position of surface alluvial deposits �ave allowed to infer a first evolutionary framework of karst during t�e late quaternary. If we refer to a simple model, w�ere fluvial deposition occurs mainly during cold stages and incision during warm stages, t�e discrete distribution of cave passages suggests t�at t�e different epi-p�reatic p�ases are t�e responses to t�e alternation of cold and warm periods. In any case, t�e re-organization of t�e river network induced by t�e tectonic uplift �ad a relevant effect on cave systems. First, t�e underground diversion of surface drainage en�anced t�e downcutting of Nw and SE perip�eral streams, w�ic� received a larger quantity of water t�roug� karst springs due to t�e favored morp�o-structural setting. Successively, t�e backward piracy of t�e allogenic catc�ments of t�e karst systems by surface tributaries led to t�e dewatering of caves and to t�e present situation.
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