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- W2756472912 abstract "Possible secular changes in the way chromitite (accumulations of chromite) have been formed across Earth’s history are reexamined based on our understanding of the origin of podiform chromitites in the mantle. In the Phanerozoic moderately depleted harzburgites have been dominant in the upper mantle and provided optimum conditions for precipitation of podiform chromitite through peridotite-magma reactions and related processes. A relatively large amount of chromium has been consequently left in the mantle as chromitite. In contrast, in the Precambrian, especially in the Archean to Early Proterozoic, the upper mantle peridotite was more depleted and could have produced only a small amount of podiform chromitites. Instead, Mg- and Cr-rich magmas reached the crust and precipitated large amounts of chromite as stratiform chromitites. The ratio of podiform chromitites/stratiform chromitites has been increasing with time, reflecting a decrease in the degree of depletion of peridotite in the upper mantle with time. This difference is due to a secular decrease in Earth’s thermal state." @default.
- W2756472912 created "2017-09-25" @default.
- W2756472912 creator A5010161027 @default.
- W2756472912 creator A5010879667 @default.
- W2756472912 date "2018-01-01" @default.
- W2756472912 modified "2023-10-01" @default.
- W2756472912 title "Secular Change of Chromite Concentration Processes From the Archean to the Phanerozoic" @default.
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- W2756472912 doi "https://doi.org/10.1016/b978-0-12-811159-8.00006-8" @default.
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