Wyniki wyszukiwania - BazTech

1

Origin of flints in the Upper Cretaceous and Danian Chalk of England, Denmark and the North Sea: Evidence from their geological setting, mineralogy, geochemistry, paramagnetic properties and ultrastructure

Jeans Christopher V., Wray David, Lampronti Giulio I., Sheikh Hassan A., Evtushenko Alexander

Acta Geologica Polonica

|

2025

|

Vol. 75, no. 4

art. no. e56

EN

Two types of flints are recognized in the Upper Cretaceous Chalk of England, the North Sea and Denmark. Alpha-quartz/moganite flints are associated with the high quartz smectite-mica clay assemblage that probably derived its silica from mainly oceanic sources related possibly to the development of the Atlantic Ocean, and opal-CT flints that are associated with the low-quartz smectite-mica clay assemblage that derived its silica ultimately from the deep weathering of continental rocks on the Mid-European Island. Eight different groups of alpha-quartz/moganite flints are described based on mineralogy, colour, core/cortex definition, size, relationship to bedding, and location. The presence of authigenic paramagnetic and non-paramagnetic minerals demonstrate that certain of these groups of flints developed in the oxic and suboxic diagenetic zones although the majority formed in the anoxic zone. Their major, minor and trace element chemistry is discussed in relation to the timing of their development. A predictive schematic model is put forward linking flint development with diagenesis, burrow-type and the plumbing system of the Chalk. The origin of flint veins and sheets is discussed within the context of the known relationship between pore size and the degree of super saturation needed for cement precipitation.

2

Kopalnia krzemienia

Zapłata R., Ptak A.

Geodeta : magazyn geoinformacyjny

|

2014

|

nr 3

32--33

3

Flint and fire

Pawlikowski M.

Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering

|

2014

|

nr 18

1--10

EN

Various knapping techniques of flints used at Stone Age effected production of various implements but was reason of discovery of lightning striking i.e. creation of way kindle of fire. An article presents results of investigation of flints and relations: age of flints, crystallinity of flints – piezoelectricity, age of flints-piezoelectricity.

4

Krzemienie w czwartorzędowym nadkładzie pokładu węgla brunatnego w Sieniawie

Bzowski Z., Dawidowski A., Kropornicki Z.

Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski

|

2010

|

Nr 137 (17)

56-64

PL

W pracy zaprezentowano na tle warunków geologicznych charakterystykę znalezionych krzemieni pochodzących z piasków szczytów wzgórz morenowych oraz z gliny zwałowej w czwartorzędowym nadkładzie pokładu węgla brunatnego w Sieniawie. Krzemienie składają się z drobnoziarnistego autogenicznego kwarcu, trudno identyfikowanej ilości amorficznego chalcedonu oraz śladowej ilości goethytu i być może moganitu. Krzemienie zawierają od 0,15 do 0,36% węgla organicznego oraz w ilościach śladowych takie metale jak mangan, stront, tytan i cynk. Trudno jest jednoznacznie wyznaczyć, które z badanych metali mogą być związane z genezą krzemieni, ich wiekiem lub taką cechą jak barwa i jej strefowe zmiany. Przypuszczalnie badane krzemienie mogą pochodzić z utworów węglanowych kredy i/lub jury występujących w północno-zachodniej Polsce lub w rejonie na północ od wybrzeża (dno Bałtyku).

EN

In the paper, geological conditions and characteristics of found flints originated from sands and boulder clay are presented. Flints are present in Quaternary overburden of the brown coal bed in Sieniawa, Poland and they consist of fine-grained authigenic quartz, hard to identify amount of amorphous chalcedon and trace amounts of goethite and possibly moganite. Flints contain from 0,15 to 0,36% of total organic carbon and trace amount of metals such as manganese, strontium, titanium and zinc. Presumably, investigated flints may origin from Jurassic and/or Cretaceous carbonate formations occurring in the North-Western parts of Poland or in the region due north from polish coast line (bottom of the Baltic Sea).

5

Geneza krzemieni górnego oksfordu w Krzemionkach Opatowskich

Pieńkowski G., Gutowski P.

Volumina Jurassica

|

2004

|

Vol. 2, no. 1

29-36

EN

Early diagenetic concretionary flint nodules from the Upper Oxfordian oolitic and micritic limestones represent silicified crustacean burrows. Their occurence is confined to very shallow carbonate facies of barrier, lagoonal, and tidal flat origin. Fills of crustacean burrows commonly provided a nucleation centre for flint formation and thereby the template on which flint nodule beds were constructed. The reason for the special relationship between flint and crustacean burrows probably lie in the original texture (high permeability) of the burrow networks and also in the organic content (including the microbial assemblages) lowering the pH. Nodule horizons are developed more or less parallel to bedding, to form several widespread horizons of the regional correlative significance.