Wyniki wyszukiwania - BazTech

1

Mineralogical studies of the Maastrichtian Gerinya Claystone of the Patti Formation, southern Bida Basin, Nigeria: Implication for industrial application

Oyetade Oluwaseye P., Konwea Charles I., Ojo Olusola J., Odesanmi Tayelolu M.

Mineralogia

|

2021

|

Vol. 52, iss. 1

10--18

EN

The mineralogical compositions of the Gerinya claystone, Patti Formation, Southern Bida Basin, Nigeria, were investigated to infer their sedimentological process and industrial application. Mineralogical analysis of the claystone was carried out using the X-ray diffraction (XRD) method. The diffractogram peaks aided the identification of the clay and non-clay minerals in the study area. The XRD showed kaolinite as the major clay mineral with compositions ranging from 10.8 - 67.6 wt%. The non-clay minerals were quartz, anatase, diopside, goethite, hematite, rutile, muscovite and microcline. Among the non-clay minerals, quartz had the highest percentage mineralogical composition of 21.2 to 83.4 wt%. The mineral assemblage is typical of a hot and humid climate where chemical alteration and hydrolysis of silicate minerals are severe. The sediments are of mafic and felsic crystalline rocks origin. The sediments are of low energy floodplain/interchannel depositional environment. The Gerinya claystone vary from low to high porosity and very low to low permeability. The claystone can be used as clay liners and as raw material for ceramic production. The application of the claystones in fertiliser production will require some processing. The claystone can be used for haemorrhage control in the pharmacological/medical sector. Although, the ingestion of the claystones could lead to dental damage and possible perforation of the sigmoid colon in the gastrointestinal tract.

2

The colour analysis method applied to homogeneous rocks

Halász A., Halmai Á.

Geologos

|

2015

|

Vol. 21, No. 4

233--239

EN

Computer-aided colour analysis can facilitate cyclostratigraphic studies. Here we report on a case study involving the development of a digital colour analysis method for examination of the Boda Claystone Formation which is the most suitable in Hungary for the disposal of high-level radioactive waste. Rock type colours are reddish brown or brownish red, or any shade between brown and red. The method presented here could be used to differentiate similar colours and to identify gradual transitions between these; the latter are of great importance in a cyclostratigraphic analysis of the succession. Geophysical well-logging has demonstrated the existence of characteristic cyclic units, as detected by colour and natural gamma. Based on our research, colour, natural gamma and lithology correlate well. For core Ib-4, these features reveal the presence of orderly cycles with thicknesses of roughly 0.64 to 13 metres. Once the core has been scanned, this is a time- and cost-effective method.

3

Upper Bajocian to Callovian (Jurassic) dinoflagellate cysts from central Poland

Poulsen N.

Acta Geologica Polonica

|

1998

|

Vol. 48, no. 3

237-245

EN

The Upper Bajocian - Bathonian organic-rich claystone succession and the Lower Callovian sandy, marly and gaize (dispersed biogenic silica) deposits of central-southern Poland yield diverse and wellpreserved dinoflagellate cyst floras dominated by ctenidodinioids, principally Ctenidodinium combazii, Dichadogonyaulax sellwoodii and Korystocysta spp. Atopodinium and Wanaea are also common. The stratigraphical distribution of dinoflagellate cysts within the Upper Bajocian to Lower Callovian has provided a detailed correlation between the Polish area and the North Sea area (chronostratigraphy and diniflagellate cyst zonation). The dinoflagellate cyst biostratigraphical events are of correlative value and are consistent with interpretations based on the macrofaunas. The Middle-Late Callovian yielded no dinoflagellate cysts. The British zonation (RIDING & THOMAS 1992, POULSEN & RIDING, in press) is demonstrated to be useful for the Polish sections. Some marker species have differences in their first or last appearances in Poland compared to those reported from England.