Precambrian geology: geological evolution of the Earth during the precambrian.
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منابع مشابه
Vestiges of life in the oldest Greenland rocks? A review of early Archean geology in the Godthabsfjord region, and reappraisal of field evidence for > 3850 Ma life on Akilia.
The Godthåbsfjord region of West Greenland contains the most extensive, best exposed and most intensely studied early Archean rocks on Earth. A geological record has been described of numerous magmatic events between ~3.9 and 3.6 Ga, and evidence of life at >3.85 Ga and ~3.8-3.7 Ga has been proposed from two widely-separated localities. Some of these claims have recently been questioned, and th...
متن کاملA comparison between geochemistry of metapelites of Hindoli and Jahazpur Groups: Two Precambrian low-grade metasedimentary sequences in NW India
The Bundelkhand-Aravalli craton is the most important lithotectonic unit in the central and western India where Paleoproterozoic Aravalli Supracrustal sequence has been deposited over an Archaean basement, the latter also known as the Banded Gneiss Complex (BGC). A NE-trending linear metasedimentary sequence, designated as the Jahazpur Belt occurs along the eastern fringe of the Aravalli Superg...
متن کاملAdvancing Precambrian palaeomagnetism with the PALEOMAGIA and PINT(QPI) databases
State-of-the-art measurements of the direction and intensity of Earth's ancient magnetic field have made important contributions to our understanding of the geology and palaeogeography of Precambrian Earth. The PALEOMAGIA and PINT(QPI) databases provide thorough public collections of important palaeomagnetic data of this kind. They comprise more than 4,100 observations in total and have been es...
متن کاملA Petrologic, Geochemical and Osmium Isotopic Study of Selected Precambrian Komatiites
Title of Dissertation: A PETROLOGIC, GEOCHEMICAL AND OSMIUM ISOTOPIC STUDY OF SELECTED PRECAMBRIAN KOMATIITES Amitava Gangopadhyay, Ph. D., 2004 Dissertation Directed By: Professor Richard J. Walker, Department of Geology The major and trace elements, and Re-Os isotope systematics of the ca. 2.7Ga komatiites from the Alexo and Dundonald Beach areas in the Abitibi greenstone belt, Canada, and ca...
متن کاملRevealing the climate of snowball Earth from ΔO systematics of hydrothermal rocks
Abteilung Isotopengeologie, Geowissenschaftliches Zentrum, Georg-August-Universität Göttingen, 37073 Göttingen, Germany; Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, 199034 St. Petersburg, Russia; CAS Key Laboratory of Crustal-Mantle Materials and Environments, School of Earth and Space Science, University of Science and Technology of China, Hefei, 230026, Ch...
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ورودعنوان ژورنال:
- Science
دوره 222 4626 شماره
صفحات -
تاریخ انتشار 1983