Is Precambarian Granite A Sedimentary Rock

Greenstone granite belts such as those of the archean continued to form in the proterozoic albeit in greatly reduced amounts.

Is precambarian granite a sedimentary rock.

Sandstone is a sedimentary rock that is worn away by dirt and dust rubbing against it in the wind. They are characterized by abundant volcanic rocks that include pillowed subaqueous basalt flows and subaerial and subaqueous volcaniclastic rocks. Sedimentary rocks are the most common rocks exposed on the earth s surface but are only a minor constituent of the entire crust. Granite is a light colored igneous rock with grains large enough to be visible with the unaided eye.

Basement rock is the thick foundation of ancient and oldest metamorphic and igneous rock that forms the crust of continents often in the form of granite. After the precambrian geologic time intervals are commonly subdivided on the basis of the fossil record. No granite is an igneous rock. Granite is not the kind of rock that would form into sandstone.

Sedimentary rocks form as a result of weathering and deposition from previously formed rocks and are usually much softer than igneous or metamorphic rocks. Sedimentary rocks on platforms range in age from precambrian to cenozoic and reach thicknesses up to 5 km as for instance in the williston basin in the north central united states. Precambrian precambrian greenstones and granites. They are composed of precambrian basement similar to that exposed in shields but overlain by 1 to 3 km of relatively undeformed sedimentary rock.

By international agreement precambrian time is divided into the archean eon occurring between roughly 4 0 billion years ago and 2 5 billion years ago and proterozoic eon occurring between 2 5 billion and 541 million years ago. Magnesian komatiites are for the most part absent however. It forms from the slow crystallization of magma below earth s surface. One easy way to.

It forms due to crystallization from magma. Sedimentary rock rock formed at or near the earth s surface by the accumulation and lithification of sediment or by the precipitation from solution at normal surface temperatures.