supracrustal in a sentence

Examples

1. No Hadean-aged zircon grains have been identified in the Nuvvuagittuq Supracrustal Belt in northern Quebec, but amphibolites have been dated to 4.28 Ga while 3.75 Ga-old banded iron formations indicate the minimum age of the belt.
2. Although there is still some debate on the kinematics of how each rock type was formed, the map at right shows a part of the Isua Supracrustal belt; these rock types are clues to the formation of the greenstone belt and have been extensively mapped.
3. The Kaminak supracrustal belt preserves igneous textures including interlocking quartz and plagioclase that are intergrown with platy biotite ( 2.084-1.914 Ga ) and stubby euhedral grains of veins of green biotite that are interpreted to have been emplaced there by a hydrothermal event accompanying a deformation along this contact area.
4. The oldest minerals on Earth are detrital zircon grains from the Yilgarn Craton in the Mesoarchaean ( 3.2 2.8 Ga ) Jack Hills, Western Australia dated to up to 4.4 Ga, meaning that granitic continental crust and probably supracrustal rocks formed during the Hadean, within 200 million years of Earth accretion.
5. The Irumide Belt comprises deformed crystalline basement units dated at 2.7 Ga and between 2.05 and 1.93 Ga, unconformably and in places structurally overlain by a supracrustal sequence of shallow water quartzites and pelites, the Muva Supergroup, in which sparse volcanic tuffs have given ages of between 1.88 and 1.85 Ga . This complex is intruded by limited granitoids at ca . 1.66-1.55 Ga and an extensive suite of syn-orogenic plutonic rocks at between 1.05 and 1.00 Ga.