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- W1020630369 abstract "Mafic dyke swarms are an important feature of the Proterozoic, and in parts of some stabilized Archaean, cratons may be the only significant geological event in perhaps 2 Ga. In less stable regions, the dyke swarms are affected by Proterozoic orogenic activity and can potentially be important time markers. Proterozoic swarms tend to be voluminous in terms of the number, width, and length of dykes. The genesis of each swarm clearly constitutes a major thermal event affecting the Earth's mantle. Because dyke swarms are often parallel to major transpressional shear zones and the dykes may be subsequently affected by these shear zones, there is clearly an important tectonic control on their genesis. Although dyke swarms have been exceptionally useful tools in separating the major phases of Proterozoic orogenic activity, achieving precise dates has proved to be much more difficult. With K–Ar dating, there are many problems of argon loss and excess argon; with Rb–Sr and Sm–Nd whole-rock dates, there are uncertainties over inherited source characteristics, crustal contamination, and metamorphic re-equilibration; and the latter can also affect U–Pb zircon or rutile dates." @default.
- W1020630369 created "2016-06-24" @default.
- W1020630369 creator A5024134208 @default.
- W1020630369 date "1992-01-01" @default.
- W1020630369 modified "2023-10-11" @default.
- W1020630369 title "Chapter 4 Geochemistry and Significance of Mafic Dyke Swarms in the Proterozoic" @default.
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- W1020630369 doi "https://doi.org/10.1016/s0166-2635(08)70118-x" @default.
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