Is Granite Older Than Sedimentary Rocks

At the inner gorge of the grand canyon the vishnu schist and zoroaster granite are overlain by sedimentary rocks.

Is granite older than sedimentary rocks.

When shallow unconsolidated sediment is composed of alternating coarse grained and impermeable clay layers the fluid pressure inside the coarser layers may reach a critical value due to lithostatic overburden. One of the best known clastic sedimentary rocks is sandstone. Bed 2 is older than bed 4 but younger than bed 1. Granites can be predominantly white pink or gray in color depending on their mineralogy the word granite comes from the latin granum a grain in reference to the coarse grained structure of such a completely crystalline rock.

The sedimentary layers were deposited on a basaltic lava flow. The granite is older if the sandstone contains pebbles of the granite. It might be possible to date some chemical sedimentary rocks isotopically but there are no useful isotopes that can be used on old chemical sedimentary rocks. But you could have had an igneous rock millions of years ago that was weathered and eroded into sediments that then became the sandstone.

The basalt is a sill intruded into older sedimentary rock. The sedimentary layers were deposited at an angle creating the dip of the layers c. The basalt is older than the sedimentary rock layers above it. Sedimentary dikes or clastic dikes are vertical bodies of sedimentary rock that cut off other rock layers.

They can form in two ways. Then later a new pluton cooled creating new granite that is younger than the sandstone. Which principle or law of geology states that in a sequence of undeformed sedimentary rocks each bed is older than the one above. Coal is a sedimentary rock formed over millions of years from compressed plants.

Inorganic detrital rocks on the other hand are formed from broken up pieces of other rocks not from living things. States that during the formation of sedimentary rocks each layer is older than the one above and younger than the one below this statement reflects the relative age of sedimentary rocks. These rocks are often called clastic sedimentary rocks. Sedimentary rock cannot be radiometrically dated you would only be dating the clasts themselves not the rock unit.

Objects enclosed in rock must be older than the time of rock formation the principle of inclusions the determination that a granite pluton is not intrusive into overlying sedimentary layers because there are pebbles of granite in the bottom most layer is an application of the principle of. The radioactive isotope potassium 40 has argon 40 as a daughter product. Strictly speaking granite is an. Granite ˈ ɡ r æ n ɪ t is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture.