Results 131 to 140 of about 2,811 (192)
Origin and Key Enrichment Factors of Helium Resource in the Lower Yangtze Region, Eastern China. [PDF]
ACS OmegaZhang C +8 more
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Process and forces of tight-sandstone gas charging in the Shihezi formation (P<sub>2</sub>x<sup>1</sup>) Dongsheng gas field, northern Ordos Basin China. [PDF]
Sci RepCao Q +8 more
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Exo-Geoscience Perspectives Beyond Habitability. [PDF]
Space Sci RevSpohn T +7 more
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1982
The Dominion Group, Witwatersrand Supergroup, and Ventersdorp Supergroup constitute a volcanosedimentary sequence that is famous for its fossil gold placers. It has been estimated that since gold-bearing conglomerates were discovered near Johannesburg (Fig. 4-1) in 1886, mines in the Transvaal and Orange Free State have produced more than 55 percent of
A. J. Tankard +5 more
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The Dominion Group, Witwatersrand Supergroup, and Ventersdorp Supergroup constitute a volcanosedimentary sequence that is famous for its fossil gold placers. It has been estimated that since gold-bearing conglomerates were discovered near Johannesburg (Fig. 4-1) in 1886, mines in the Transvaal and Orange Free State have produced more than 55 percent of
A. J. Tankard +5 more
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Scientific American, 1991
Living organisms have inhabited the surface of our planet for nearly four billion years. Yet the plants and animals that define our everyday existence have far more recent origins. The ancestors of modern trees and terrestrial animals first colonized land only about 450 million years ago.
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Living organisms have inhabited the surface of our planet for nearly four billion years. Yet the plants and animals that define our everyday existence have far more recent origins. The ancestors of modern trees and terrestrial animals first colonized land only about 450 million years ago.
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1992
First published in 1992, The Proterozoic Biosphere was the first major study of the paleobiology of the Proterozoic Earth. It is a multidisciplinary work dealing with the evolution of the Earth, the environment and life during the forty percent of Earth's history that extends from the middle of the Precambrian eon (2500 Ma) to the beginning of the ...
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First published in 1992, The Proterozoic Biosphere was the first major study of the paleobiology of the Proterozoic Earth. It is a multidisciplinary work dealing with the evolution of the Earth, the environment and life during the forty percent of Earth's history that extends from the middle of the Precambrian eon (2500 Ma) to the beginning of the ...
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Proterozoic Atmospheric Oxygen
2014This article is concerned with the evolution of atmospheric oxygen concentrations through the Proterozoic Eon. In particular, this article will seek to place the history of atmospheric oxygenation through the Proterozoic Eon in the context of the evolving physical environment including the history of continental growth and volcanic outgassing, as well ...
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Tectonophysics, 1987
Abstract Proterozoic rifts at various stages of extension have been involved in different types of endogenous activity. As a result, the following evolutionary gradation of riftogenous structures is recorded: Aulacogens—continental paleorifts that are not affected by metamorphism and granite formation; intracontinental ensialic folded systems which ...
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Abstract Proterozoic rifts at various stages of extension have been involved in different types of endogenous activity. As a result, the following evolutionary gradation of riftogenous structures is recorded: Aulacogens—continental paleorifts that are not affected by metamorphism and granite formation; intracontinental ensialic folded systems which ...
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A small marine biosphere in the Proterozoic
Geobiology, 2018AbstractThe riverine supply of the globally limiting nutrient, phosphorus, to the ocean accounts for only a few percent of nutrient supply to photosynthetic organisms in surface waters. Recycling of marine organic matter by heterotrophic organisms provides almost all of the phosphorus that drives net primary production in the modern ocean.
Thomas A. Laakso, Daniel P. Schrag
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