Petrografia piaskowców kwarcytowych środkowego kambru z Dużej Wiśniówki koło Kielc

Abstract

PETROGRAPHY ON QUARTZITE· SANDSTONES OF MIDDLE CAMBRIAN AT DUŻA WIŚNIÓWKA NEAR KIELCE (ŚWIĘTY KRZYŻ MTS.)

Cambrian quartzite sandstones, by geologists commonly called quartzites, appear in the culminating axis of the Łysogóry ridge and on its extensions. Góra Wiśniówka (Wiśniówka Hill) is situated at the western margin of this ridge. Since almost thirty years this ridge supplies good material for road construction; partly, too, this raw material is being used for the manufacture of siliceous fireclay materials.

Within the range of Duża Wiśniówka, these quartzite sandstones appear in 2 complexes (see Fig. 1); parallel to each other, but separated by a complex of argillaceous shales and clays. The entire formation is powerfully disturbed and dislocated.

The northern complex (A) is the younger one; it is built of alternating sandstone and shale strata. The southern, complex (B), the older one, consists of thick sand-stone beds, disclosing shale intercalations in its northern limb only. The quartzites dip almost vertically. The purpose of this paper is the investigation of the petrographic character, the variability of grain sizes of the sandstones in two continuous sections (see Fig. 2), and of the differences in petrographic character and degree of digenesis occurring between complex A and B.

The quartzite sandstones are finegrained; the grains are smaller in complex A (see Table 1). The texture of these sandstones is chiefly regenerative, in the northern as well as in the southern complex.