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19-08-2022
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________ sandstone contains abundant feldspar, suggesting that the sand was derived by weathering and erosion of granitic bedrock.

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Tutorconsortium347 Tutorconsortium347

02-09-2022

Arkose sandstone contains abundant feldspar, suggesting that the sand was derived by weathering and erosion of granitic bedrock.

What is an Arkose?

Arkose or arkosic sandstone is a type of detrital sedimentary rock that contains at least 25% feldspar. Arkosic sand is feldspar-rich sand that has the potential to be a precursor to arkose. Quartz is the most common mineral component, but mica is also present.

Arkose is typically a current-deposited sandstone of continental origin that occurs as a thick, wedge-shaped mass with a limited geographic extent (as in a fault trough or a rapidly subsiding basin).

It may be strongly cross-bedded and associated with coarse granite-bearing conglomerate, and it may indicate a high-relief environment with vigorous erosion of strongly uplifted granitic rocks in which the feldspar was not exposed to prolonged weathering.

Arkose may also occur as a thin blanket like residuum derived from and resting on granitic rock at the base of a sedimentary series.

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