scholarly journals NOVÝ VÝSKYT MENILITOVÉHO SOUVRSTVÍ U DŘEVOHOSTIC

2016 ◽  
Vol 22 (1-2) ◽  
Author(s):  
Kamil Kropáč ◽  
Zdeněk Dolníček ◽  
Antonín Přichystal ◽  
Tomáš Lehotský ◽  
Tamara Koštuříková ◽  
...  
Keyword(s):  
Rock Matrix ◽  
Siliceous Sponge ◽  
Rock Body ◽  
Small Bodies ◽  
Planktonic Diatoms ◽  
Carpathian Flysch ◽  
Carpathian Foredeep ◽  
Geological Map ◽  
Sponge Spicules ◽  
The Village

The Menilite Formation is an important lithostratigraphic member of the Krosno-menilite Unit in the Carpathian Flysch Belt. The rocks of the Menilite Formation occur as small bodies also within Sub-Silesian Unit on the geological map sheet 25-13 Přerov. In this paper, we present new occurrence of chert layers of the Menilite Formation at ground elevation 275 which is situated 1.2 km easternlyof the village Dřevohostice. The rock body is formed of layers of laminated gray-white to gray-brown menilite chert interlayered by thin interpositions of weathered gray-green non-calcareous claystones. The menilite cherts consist of brownish-yellow and gray opal laminae with limonite and chalcedony streaks. Opal laminae have thickness mostly in range of 1–10 mm. Rock matrix is cut by numerous veins formed by opal and chalcedony which originated during at least two diff erent events. Menilite cherts sporadicallyenclose small siliceous chalcedony geodes. Claystones have pelitic texture with a clotted inner structure and contain siliceous sponge spicules and other non-specified microfossils (probably planktonic diatoms). The cherty layers documented in a dug probe have WNW–ESE direction with inclination to SSW under the angle of 25°. The sediments were folded during the overthrust of the Sub-Silesian Nappe on the Carpathian Foredeep in the Karpatian and during subsequent late-tectonic rotations towards NW.

scholarly journals VÝSLEDKY MIKROPALEONTOLOGICKÉ REVIZE ŠARATICKÝCH CF VRTŮ

2014 ◽  
Vol 21 (1-2) ◽  
Author(s):  
Miroslav Bubík
Keyword(s):  
Cluster Analysis ◽  
Marginal Zone ◽  
Benthic Communities ◽  
Field Observations ◽  
Benthic Foraminifer ◽  
Planktonic Foraminifers ◽  
Carpathian Flysch ◽  
Sponge Spicules ◽  
Fish Otoliths

Restudy of archive foraminifer slides from Šaratice boreholes and new field observations allowed revision of the geology in the margin of the Carpathian Flysch Belt southeast of Brno. In the marginal zone originally assigned to the Němčice Formation newly three different formations were distinguished: Pouzdřany Formation of the Pouzdřany Nappe, and Němčice and Menilite formations of the Ždánice Nappe. Planktonic foraminifers were applied in biostratigraphical assignment of samples. Benthic communities were statistically evaluated using cluster analysis. Each formation has distinct microfossil taphocoenosis and characteristic benthic foraminifer community. Microfossil communities with abundant sponge spicules and diatom valves preserved in opal and also presence of small mollusc fauna and fish otoliths indicate that marginal zone of Ždánice Nappe was deposited little bit shallower than the more internal zones. Also lithology reflects different palaeoenvironment. Clays of the Menilite Formation are macroscopically undistinguishable from Hustopeče-type clays of the overlying Ždánice-Hustopeče Formation. The Ždánice-type sandstones are practically missing. Grey pelocarbonate concretions are frequent in both Menilite and Ždánice-Hustopeče formations. The marker lithologies of the Menilite Formation – the menilite chert and Dynów-type marlstone (or their analogues) – were not observed yet. Results of the revision show that the marginal zone of the Carpathian Flysch Belt in Šaratice area comprises tectonic slices of mentioned formations, the number and order of whose change from borehole to borehole.

scholarly journals Eclogite-like rocks from Southern Pirin Mountains – preliminary results about petrology and time of formation

2021 ◽  
Vol 82 (3) ◽  
pp. 61-63
Author(s):  
Lyubomirka Macheva ◽  
Philip Machev ◽  
Rossitsa Vassilevа ◽  
Yulia Plotkina
Keyword(s):  
Mineral Assemblage ◽  
Late Jurassic ◽  
Mineral Chemistry ◽  
Metasomatic Alteration ◽  
Preliminary Results ◽  
Icp Ms ◽  
Geological Map ◽  
Host Rocks ◽  
The Village

North-northeast of the village of Ilinden (Southern Pirin Mnt.) three eclogite boudins were separated on the geological map in scale 1:50 000 (Sarov, 2010). The rocks belong to the Slasten lithotectonic unit. The mineral assemblage and mineral chemistry do not allow these rocks to be classified as eclogites. They can be considered as eclogite-like ones, formed by postmagmatic-metasomatic alteration of the host rocks. Based on LA-ICP-MS sphene U-Pb dating, eclogite-like rocks yield a Late Jurassic age (160±19 Ma).

Carbon Replicas of Siliceous Sponge Spicules

Science ◽  
1967 ◽  
Vol 157 (3788) ◽  
pp. 581-582
Author(s):  
Ryan W. Drum
Keyword(s):  
Siliceous Sponge ◽  
Sponge Spicules ◽  
Carbon Replicas

scholarly journals A Solid State NMR Investigation of Recent Marine Siliceous Sponge Spicules

Minerals ◽  
2016 ◽  
Vol 6 (1) ◽  
pp. 21 ◽  
Author(s):  
Sylvie Masse ◽  
Andrzej Pisera ◽  
Guillaume Laurent ◽  
Thibaud Coradin
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Siliceous Sponge ◽  
Sponge Spicules

scholarly journals Střednopleistocenní sesuv na svazích Drahanské vrchoviny u Viničných Šumic

2019 ◽  
Vol 26 (1-2) ◽  
Author(s):  
Pavla Tomanová ◽  
Oldřich Krejčí ◽  
Nela Doláková ◽  
Helena Gilíková ◽  
Šárka Hladilová ◽  
...  
Keyword(s):  
Middle Pleistocene ◽  
Western Margin ◽  
Central Paratethys ◽  
Slope Movements ◽  
Fine Grained ◽  
Carpathian Foredeep ◽  
Large Landslide ◽  
Sponge Spicules ◽  
Fine Grained Sand

In 2018 an excavation of 20 × 20 m large and up to 5 m thick calcareous clays of the Langhian age was found. Rich and diversified assemblages of foraminifers with species Orbulina suturalis Brön. and Martinotiella karreri (Cush.) indicate early Badenian (in sense of the Central Paratethys regional stratigraphy) age of the sediments, zone M5b sensu Berggren et al. (1995). Variously deformed lenses and layers of fine-grained sand with several blocks of white calcareous silts and with two layers of clayey sediments with pebbles were found. The identified outcrop is part of a large landslide situated at the western margin of the Carpathian Foredeep. Samples determining the age of the landslide movements were taken from Badenian clays and from slope sediments with pebbles for study of palynomorphs. Very rich and diversified fauna was described mainly from the fine-grained sand creating layers in calcareous clays. The assemblage contained tests of foraminifers, spines of the echinoids, fragments of sponge spicules, rich fragments of molluscs and zoarias of bryozoas, worms – Ditrupa cornea (Linnaeus, 1758), Serpula sp., ?Serpulidae indet., fragments of brachiopods, arthropods, coral, ostracods, teleostei etc.The findings from the Badenian and Quaternary periods were mixed by slope movements. Large landslide in the Middle Pleistocene was the terminal gravity proces in the area of Viničné Šumice.

Ordovician sponge spicules from New South Wales, Australia

1993 ◽  
Vol 67 (1) ◽  
pp. 28-41 ◽  
Author(s):  
B. D. Webby ◽  
J. Trotter
Keyword(s):  
Debris Flows ◽  
New South ◽  
New South Wales ◽  
Late Ordovician ◽  
New Genera ◽  
Siliceous Sponge ◽  
Upper Cambrian ◽  
South Wales ◽  
Sponge Spicules ◽  
First Time

An abundant, varied, and well-preserved assemblage of discrete sponge spicules of late Ordovician age is described from the Malongulli Formation of central New South Wales. It is associated with one of the most diverse Ordovician siliceous sponge faunas known. The assemblage occurs in allochthonous limestone blocks within breccia deposits of a predominantly graptolitic and spiculitic siltstone succession, and is composed mainly of hexactinellid spicule types. Included are a number of distinctive forms, recognized as new taxa—Silicunculus bengtsoni, Kometia cruciformis, Chelispongia prima, and Pseudolancicula exigua. All are new genera except Silicunculus Bengtson, 1986, which was previously described from the upper Cambrian of Queensland. The problematical Anomaloides reticulatus Ulrich, 1878, is reported for the first time from Australia. A wide variety of other diagnostic, but more generalized, spicule types also occurs, including stauractines, pinnular and nonpinnular pentactines and hexactines, ornamented oxyhexasters and echinhexasters, clavules, anchorate root-tufts, and uncinates. The pinnular pentactines may be assigned to the form genus Palaeorubus Ishiga (in Ishiga et al., 1987), interpreted incorrectly by Ishiga as a radiolarian. The sponges, discrete spicules, and radiolarians of these limestone clasts were transported in debris flows to a basinal setting from peri-platform oozes that formed on the flanks of the shallow offshore island-arc platform of the Molong High.

Sign in / Sign up

Export Citation Format

Share Document