منابع مشابه
Numerical models, geochemistry and the zero-paradox noble-gas mantle.
Numerical models of whole-mantle convection demonstrate that degassing of the mantle is an inefficient process, resulting in ca. 50% of the (40)Ar being degassed from the mantle system. In this sense the numerical simulations are consistent with the (40)Ar mass balance between the atmosphere and mantle reservoir. These models, however, are unable to preserve the large-scale heterogeneity predic...
متن کاملGeochemistry. Ironing out the oxidation of Earth's mantle.
clicking here. colleagues, clients, or customers by , you can order high-quality copies for your If you wish to distribute this article to others here. following the guidelines can be obtained by Permission to republish or repurpose articles or portions of articles ): May 11, 2012 www.sciencemag.org (this information is current as of The following resources related to this article are availab...
متن کاملRethinking early Earth phosphorus geochemistry.
Phosphorus is a key biologic element, and a prebiotic pathway leading to its incorporation into biomolecules has been difficult to ascertain. Most potentially prebiotic phosphorylation reactions have relied on orthophosphate as the source of phosphorus. It is suggested here that the geochemistry of phosphorus on the early Earth was instead controlled by reduced oxidation state phosphorus compou...
متن کاملGeochemistry of lavas from the Garrett Transform Fault: insights into mantle heterogeneity beneath the eastern Pacific
Young intra-transform lavas erupted as a result of extension within the Garrett Transform Fault on the southern East Pacific Rise, are more porphyritic, less evolved, have lower concentrations of incompatible trace elements, and lower ratios of more incompatible to less incompatible elements (e.g. low K=Ti and La=Sm) compared to lavas from the adjacent East Pacific Rise ridge axis. Sr, Nd and P...
متن کاملGeochemistry of Lavas from Mauritius, Indian Ocean: Mantle Sources and Petrogenesis
Trace-element and Nd-Sr-Pb isotopic data for mafic lavas from the Mascarene island of Mauritius reveal that the shield-stage Older Series (with 143Nd/144Nd = 0.512827 to 0.512853, 87Sr/86Sr = 0.70412 to 0.70433, and 206Pb/204Pb = 18.771 to 19.024) is geochemically very similar to the shield-building lavas of the younger island of Réunion. The post-shield Intermediate and Younger Series lavas of...
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ژورنال
عنوان ژورنال: Science
سال: 2002
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.295.5558.1195b