Pierwsze stanowisko spor górnopermskich z synklinorium północnosudeckiego

Abstract

Przedstawiono po raz pierwszy udokumentowane florystycznie osady górnego permu w synklinorium północnosudeckim. Na podstawie zmian morfologicznych ziarn pyłków Lueckisporites uchwycono zonę palinologiczną Aa, Ab i Ac? Lueckisporites. Zonie tej odpowiadają cykle sedymentacyjne werra i stassfurt.

FIRST LOCAUTY OF UPPER PERMIAN SPORES IN THE NORTH-SUDETIC SYNCUNORIUM

Upper Permian rocks of the North-Sudetic Synclinorium are for the first time dated on the basis of microflora (Fig. 1). The palynological zone Aa, Ab and Ac (?) Lueckisporites (H. Visscher, 1971), corresponding to the Werra am Stassfurt sedimentary cycles, is here distinguished with reference to morphological changes of Lueckisporites pollen grains.

The studied material comprised 40 core samples from the borehole Bolesławiec N 24, depth interval from 1433.5 to 1548.6 m. The rocks encountered there mainly include dolomites, dolomitic limestones and marly limestones with interbeddings of dark-grey. shales and siltstones am sandstone intercalations (Fig. 2). Spore-pollen spectrum mainly comprises pollen grains which represent about 75% of the whole microfloristic assemblage, as well as single microspores without any greater stratigraphic value (5%), and Acritarcha microplankton (20%).

In marly-calcareous rocks (1546.3-1459.7 m), there was found an assemblage consisting of innumerous spores am pollen and Acritarcha microplankton. The Saccites group is primarily represented by bisaccate pollen grains: Lueckisporites, Klausipollenites + Pityosporites, Labiisporites and Jugasporites. The share of monosaccate pollen grains (Monosaccites), i.e. Cordiaitina, Potonieisporites and Nuskoisporites, is rather small. The second assemblage, recorded from the depth 1549.7-1433.5, displays a reduction of the above mentioned genera. The share of the genera Klausipollenites, Labiisporites and IlIinites increases and the genus Klausipollenites is represented by the species K. schaubergeri (P o t.  et  K l.) J o n s o n i u s. The recorded oscillations in the shares of microflora indicate changes related to the age of the deposit. According to J. Pattison and others (1973), the above mentioned reduction in the occurrence of microflora is usually marked at the tum of the upper Z1 and Z2, corresponding to the palynological zone Aa, Ab and Ac (?) IlIeckisporites (H. Visscher, 1971).

The microflora was found to be accompanied by Acritarcha microplankton, mainly represented by the genera Protoleiosphaeridium, Micrhystridium, Multiplicisphaerimum, Veryhachium, Leiosphaeridium and Tasmanites. These genera may indica1e that these are marine deposits originating in shallow and near-shore waters of partly landlocked basins (H. Górka, 1971).

The obtained microfloristic material resembles the spore-pollen spectrum of the Upper Permian of the Góry Świętokrzyskie Mts (S. Dybova-Jachowicz, 1978). It is also very similar to microflora described from the western Europe (R .Grebe, 1957; W. Klaus, 1954) and Canada (J. Jansonius, 1962).