Abstract
Prispevek podaja rezultate preucevanja diagenetskih konkrecij iz Jame v kamnolomu Tounj (srednja Hrvaska). Konkrecije se pojavljajo v nestrjenem in nesortiranem klasticnem jamskem nanosu. Sestavljajo jih delci razlicne velikosti (od gline do prodnikov) in razlicnega izvora. Del kalcitnih in glinastih mineralov izvira iz kapnikov in apnencevih jamski sten. Detriticni delci, kot so roženec, kremen, muskovit, klorit, ilmenit, magnetit in vecji del glin, so verjetno naneseni v jamo s povrsja, s triasnih in pleistocenskih klasticnih sedimentov. Avtohtone sestavine konkrecij so limonitni pizoidi in nekaj kalcitnega veziva. Sestava konkrecij je podobna sestavi okoliskega nevezanega sedimenta. Diagenetic concretions from Cave in Tounj quarry (central Croatia) are studied. Concretions are found in non-cemented unsorted clastic cave deposit. They consist of particles of different size (clay to pebble) and from different provenance. One part of calcite and clay minerals are coming from speleothems and cave walls limestone. Detrital particles: chert, quartz, muscovite, chlorite, ilmenite, magnetite and most of clay, are probable transported into the cave from Triassic and Pleistocene clastic sediments from the surface. Autochthonous constituents of concretions are limonitic pizoids and some calcite cement. Composition of concretion is similar to the composition of surrounding non-cemented sediment.
Published Version
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