Studia petrologiczne lamprofirów Gór Świętokrzyskich

Abstract

PETROLOGICAL STUDIES OF THE LAMPROPHYRES IN THE ŚWIĘTY KRZYŻ MOUNTAINS

In the Święty Krzyż Mountains only two kinds of magmatic rocks are known, - lamprophyres and diabases. These rocks occur in the shape of small intrusions amidst Old-Palaeozoic sediments and, on the surface, do not disclose any connection with larger bodies of magmatites. The present paper reports petrological studies of the lamprophyres.

Lamprophyres have been observed mainly amidst rock formations of the Lower Cambrian; in one instance only were they reached by boring in clastic sediments of the Lower Devonian (K. Pawłowska, 1958). They appear in a geanticlinal area which geologically belongs to the Kielce region. Here the lamprophyres form ostensibly in the periphery of the diabases of the Bardo basin a ring open northwards, extending in a zone of some 40 km. length in an E-W direction; the width of this zone is3  km. in the east and 5 km in the west. Geological surveys show that, at the dept from 16 to 40 km., greater bodies of lamprophyres exist (in an area runing from Kabza, Wzory, Zielonka and Zaldów by way of Poręba and Stobica as far as Winna near Łagów). The lamprophyres show features of intrusions filling fissures of tectonic fractures (S. Pawłowski, 1953, 1954).