Problems with dating metamorphic rocks different dating methods fossils

Posted by / 24-May-2016 11:07

Problems with dating metamorphic rocks

Granite often occurs as relatively small, less than 100 km² stock masses (stocks) and in batholiths that are often associated with orogenic mountain ranges.Small dikes of granitic composition called aplites are often associated with the margins of granitic intrusions.

A granitic rock with a porphyritic texture is known as a granite porphyry.

In some locations, very coarse-grained pegmatite masses occur with granite.

Granite has a felsic composition and is more common in recent geologic time in contrast to Earth's ultramafic ancient igneous history.

However, the composition and origin of the magma that differentiates into granite leaves certain geochemical and mineral evidence as to what the granite's parental rock was.

The final mineralogy, texture and chemical composition of a granite is often distinctive as to its origin.

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Felsic rocks are less dense than mafic and ultramafic rocks, and thus they tend to escape subduction, whereas basaltic or gabbroic rocks tend to sink into the mantle beneath the granitic rocks of the continental cratons.

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