Loricate choanoflagellates (unicellular, eukaryotic flagellates; phylum Choanozoa) synthesize a basket-like siliceous lorica reinforced by costal strips (diameter of approximately 100 nm and length of 3 μm). In the present study, the composition of these siliceous costal strips is described, using Stephanoeca diplocostata as a model. Analyses by energy-dispersive X-ray spectroscopy (EDX), coupl...

Many sets of Paleozoic marine organic-rich shale strata have developed in South China. However, the exploration and development results these formations are quite different. Based on data core experiment analysis, drilling, fracturing test typical wells, reservoir differences controlling factors four southern China investigated. The obvious characteristics. Ordovician–Silurian mainly develops s...

To fully utilize the siliceous whiskers and improve the mechanical properties of oil-well cement, the cement composites with different additions of siliceous whiskers were prepared, and analyzed by means of scanning electron microscopy (SEM), mechanical testing, X-ray diffraction (XRD), and infrared spectrum analysis. The results showed that the addition of 2% siliceous whiskers could slightly ...

The composition of four recent siliceous marine sponge spicules was studied and compared. In particular, multinuclear (29Si, 13C, 31P) solid state nuclear magnetic resonance (NMR) allowed the characterization of both the mineral and organic constituents in a non-destructive manner. The silica network condensation was similar for all samples. The organic matter showed a similar pattern but varie...

The Qinzhou Bay-Hangzhou Bay joint belt is a significant tectonic zone between the Yangtze and Cathaysian plates, where plentiful hydrothermal siliceous rocks are generated. Here, the authors studied the distribution of the siliceous rocks in the whole tectonic zone, which indicated that the tensional setting was facilitating the development of siliceous rocks of hydrothermal genesis. According...

Examination of Jurassic decapod crustaceans associated with microbialite-siliceous sponge biostromes in Gura Dobrogei, eastern Romania, has yielded a unique association of these organisms. Goniodromites aliquantulus new species appears to have inhabited layered sponge biostrome settings only, whereas Cycloprosopon dobrogea and Goniodromites spp. appear to have inhabited a variety of microbialit...