Journal ArticleDOI
THE Re-Os ISOTOPE SYSTEM IN COSMOCHEMISTRY AND HIGH-TEMPERATURE GEOCHEMISTRY
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The Re-Os isotope sytem, based on the long-lived β− transition of 187Re to 187Os, has matured to wide use in cosmochemistry and high-temperature geochemistry as discussed by the authors.Abstract:
▪ Abstract The Re-Os isotope sytem, based on the long-lived β− transition of 187Re to 187Os, has matured to wide use in cosmochemistry and high-temperature geochemistry. The siderophilic/chalcophilic behavior of Re and Os is different from that of the elements that comprise most other long-lived radiogenic isotope systems. Magmatic iron meteorites (IIIAB, IIAB, IVA, and IVB) have Re-Os isochrons that indicate asteroidal core crystallization within the first 10–40 million years of Solar System evolution. Rocks from Earth's convecting mantle show generally chondritic Re/Os evolution throughout Earth history that is explained by the addition of highly siderophile elements to the mantle after core formation via late accretion. Oceanic basalts have Os-isotope systematics that improve the detailed geological interpretation of extant mantle components. Some portions of ancient subcontinental lithospheric mantle are severely depleted in Re and have correspondingly subchondritic 187Os/188Os, indicating long-term i...read more
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Journal ArticleDOI
The Hf isotope composition of cratonic mantle: LAM-MC-ICPMS analysis of zircon megacrysts in kimberlites
William L. Griffin,William L. Griffin,Norman J. Pearson,Elena Belousova,Simon E. Jackson,E. van Achterbergh,Suzanne Y. O'Reilly,S. R. Shee +7 more
TL;DR: In this article, the isotopic composition of Hf has been measured in 124 mantle-derived zircon megacrysts from African, Siberian and Australian kimberlites, using a laser-ablation microprobe (LAM) and a multi-collector ICPMS.
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Composition of the depleted mantle
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Osmium isotopic compositions of mantle xenoliths: A global perspective
TL;DR: Menzies et al. as mentioned in this paper used spinel-bearing mantle peridotites from a common fertile source (PUM) between 1 and 2 Ga ago to estimate the chemical composition of domains within the mantle.
Book ChapterDOI
Mantle Samples Included in Volcanic Rocks: Xenoliths and Diamonds
TL;DR: A review of the geochemistry of mantle xenoliths can be found in this article, where the authors review the geochemical properties of mantle nodules and find that they are dominantly alkaline in nature.
Journal ArticleDOI
Integration of geology, geophysics and geochemistry: A key to understanding the North China Craton
TL;DR: In this paper, the authors studied the North China Craton (NCC) at the end of the Pre-Cambrian and revealed decoupling brought about by repeated orogenic events over the history of NCC.
References
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Journal ArticleDOI
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Journal ArticleDOI
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Journal ArticleDOI
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Journal ArticleDOI
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TL;DR: In this article, the authors compile all known in situ LIPs younger than 250 Ma and analyze dimensions, crustal structures, ages, and emplacement rates of representatives of the three major LIP categories: Ontong Java and Kerguelen-Broken Ridge oceanic plateaus, North Atlantic volcanic passive margins, and Deccan and Columbia River continental flood basalts Crustal thickness ranges from 20 to 40 km, and the lower crust is characterized by high (70-76 km s?1) compressional wave velocities.
Journal ArticleDOI
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