supracrustal वाक्य
उदाहरण वाक्य
मोबाइल
- The supracrustal rocks comprise nappes that form part of the Ungava and Labrador troughs.
- The Paleoproterozoic recrystallization ) in the batholith with that in the supracrustal wall rocks.
- The archean rocks members of Belo Horizonte complex and supracrustal sequences of the Paleoproterozoic is predominant.
- The focus of their investigation was a formation known as the Isua supracrustal belt of Akilia Island in southern West Greenland.
- The Rae Craton Archean rocks are overlain by Paleoproterozoic supracrustal dykes ( ca . 2.0-2.2 Ga ).
- The first granitic event in the South Pass area includes tonalite dikes and plugs intruded into shear zones in the South Pass supracrustal rocks along with light-colored, metamorphosed leucodacite porphyry and quartz diorite.
- The Wyoming Craton consists mainly of two gross rock units granitoid plutons ( 2.8 2.55 Ga ) and gneiss and migmatite together with subordinate ( < 10 percent ) supracrustal metavolcanic-metasedimentary rocks.
- The supracrustal rocks of the Dharwar Group of the southern Indian Peninsula, as depicted in the geological map of South India, have the Peninsular Gneiss as the basement rock formation, also stated to be the remobilized basement.
- Some conclude that it formed at an ancient ocean-ocean convergent zone, where subduction-caused partial melting and metasomatism of the mantle as well as the intrusion of tonalites partially melted the overlying supracrustal rocks and created the first continental crust.
- This section of the Churchill province was formerly called the Ennadai-Rankin greenstone belt and include the Kaminak, Yathkyed, MacQuoid and Rankin supracrustal belts, containing a wide range of intrusive Neoarchean plutonic rocks ranging in composition from gabbro to syenogranite.
- 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.
- 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.
- 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.
- 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.
- 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.
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