Hidrológiai Közlöny 1946 (26. évfolyam)

Földvári Aladár dr.: A kassai Lajos forrás hidrogeológiája

Hydrogeology of the Lajos-spring near Kassa (Kosice, Czecho-Slovakia). by A. Földvári. I. Geological constitution of the area. The Szepes-Gömör Metalliferous Mountains forming the crystalline-palaeozoic „inner zone" oi the Carpathians is terminating abrupty at Kassa. The Pre tertiary formations were thrown down during the Pliocene by transversal faults and became buried by Tertiary and Quaternary sediments. The Lajos-spring lying on the western bank of the Hernád riven: on a Holocene terrace, i9 situated on the border of the Pre tertiary rocks. These rocks, contrary to the younger sediments, have a verv complicated structure. The rocks ot the Carpathian „inner zone" were rolded during the Alpine orogenesis. The folds of the SzepesGömör Metalliferous Mountains became thrusted northwards and by crushing apart of the foot-limbs, a row off isoclinal soles appeared These soles are built up by following members: phyllites with porphytroide and diabaseldikes, Upper Carboniferous shales, sandstones, crinoidal limestones, magnesite. Lower Permian mottled shales, Upper Permian quartzite sandstones, Middle Triassic „Guttenstein" dolomites and Upper Triassic „Dachstein" limestones. The soles repore upon a granite laccolith with contact envelope and pegmatite, aplite, kersantite veins. II. Hydrology of the region. The water of the spring may be furnished by the Permian and Triassic beds of a sole which is striking just towards the spring. The Lajos-spring itself appears precisely on the overthrust line of the sole. The chemical analyses (see in the Hungarian text) indicate that the dissolved matter of the spring-water may derive from the Upper Permian sandstone and Middle Triassic dolomite. Calculated from the proportion of the dissolved salts, the dolomite might yield twice as much water as the sandstone. The COo and H

2S-content of the spring-water cannot attributed to the rocks of the Szepes-Gömör Metalliferous Mountains (Lower Carboniferous granite and older rock-veins). The dissolved gaseis originate probably from the vounger volcanic area of the Eperjes-Tokaj Mountains lyng eastward of the Hernád valley. There are several C0

2 bearing springs on this area, the most famous being the fountain of Ránk-Herlány. Tha Tertiary and Quaternary beds join the mentioned old-