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Cryptocrystalline quartz concretions (flint) of different density, size, morphology and abundance, occur isolated and concentrated in layers in the Late Cretaceous (Tuffaceous) Chalk of NW Europe. Concretions started to grow during early diagenesis at sites of elevated authigenic silica-polymorph concentrations, a result of bacterial metabolism in an anoxic mixture of skeletal carbonate, skeletal opal, organic matter and pore fluid. The late diagenetic growth of flint nodules has been investigated with the help of a numerical model that simulates the dissolution, diffusion and precipitation of different silica polymorphs in a medium of changing porosity/permeability. It is suggested that the occurrence of various flint types reflects the distribution of the early diagenetic, authigenic silica polymorphs, rather than the distribution of detrital skeletal opal. The model results imply that flint nodules can be used to reconstruct the depositional and early diagenetic conditions during the genesis of sequences of Chalk with flint.
What else can I help you with?
Where did cretaceous get its name?
The origin of the word cretaceous comes from the Latin "creta" which means "chalk".
What does Chelsea mean in English?
It is of Old English origin, and its meaning is "chalk landing place".
Have stones ever lived?
Certain rocks have a biological origin, like coal and chalk. In these cases, the rock represents a once living biomass.
What is the rock that makes up white cliffs of dover?
chalk
What is a word that goes before chalk?
colored chalk sidewalk chalk dustless chalk
What compound words have chalk?
Some compound words with "chalk" are chalkboard, chalk dust, chalk line, chalk stick.
What did democritus call the smallest piece of chalk after breaking it over?
He was using this to compare it to the smallest part of an element ... an atom which he called "atomos" from the Greek origin
What is a collective noun for chalk?
A collective noun for chalk is a box of chalk.
Does white chalk last longer than blue chalk?
your an idiot, no a whitle chalk is not longer than aq blue chalk
What is the gender of chalk?
The word 'chalk' is a neuter noun, a word for a thing that has no gender.
What is the solute and solvent in chalk water?
Water is the solvent and chalk is the solute.
What is the hardness of chalk?
There are a couple of things that make chalk hard. The calcium in chalk is said to make chalk hard.
