archean造句
1. Their source is the Archean Group.
2. Discordances existed between Fangniushan quartzite series and underlying Archean Eon metamorphic granite series, and overlying the Mesoproterozoic Era Xionger Group.
3. Archean rocks stretches35 kilometers along the western edge of the bluish-gray monolith of the Greenland ice cap.
4. The Archean metamorphic rocks are composed of extrusive rocks and metamorphosed plutonic rocks. The former usually exists as inclusions of various size in the latter.
5. Late Archean and Early Proterozoic were the main period for the formation of continental crust.
6. Such low levels of sulfate indicate that the Archean atmosphere was virtually devoid of oxygen.
7. Isua's four-kilometer-wide belt of Archean rocks stretches 35 kilometers along the western edge of the bluish-gray monolith of the Greenland ice cap.
8. Some Archean greenstone belts represent collages of allochthonous fragments, among which oceanic crust slices are identified with characteristics distinct from the Phanerozoic ophiolites.
8.try its best to collect and build good sentences.
9. Studies on stable isotopes in gold deposits in Nankouqian area show that the geneses of the gold deposits are closely related to the Archean granite-greenstone belt.
10. The Hongtoushan copper - zinc deposit was formed in submarine volcanic eruptions - sedimentary environment in Archean intracratonic rift trough.
11. Various geochronometric methods have been applied to dating of important geologic events in complex Archean terranes.
12. It is much more complex and difficult to study Archean stratigraphy than Phanerozoic stratigra - phy.
13. The se data imply that nitrify in gan d denitrify in g microbes had already evolved by the late Archean and were present be fore oxygen first beg an to accumulate in the atmosphere.
14. Felsic gneiss is the most widely distributed rock type in Archean metamorphic complex areas.
15. The history of Earth is divided into four eons — starting with the earliest, these are the Hadean, Archean, Proterozoic, and Phanerozoic.
16. It's 100 % pure natural and is extracted from an archean plant -- Ginkgo Bibloba Tree.
17. Huaian Datong region on the bounder of Hebei Shanxi Inner Mongolia is one of the most important area where the Archean granulite complex is relatively completed exposed.
18. Early Paleozoic rock are mainly carbonate , dolomite, Carboniferous - Permian coal-bearing clastic rock and a small amount of Archean crystalline metamorphic rocks and Mesozoic-Cenozoic granite acid.