On Ferroan (A-type) Granitoids: their Compositional Variability and Modes of Origin
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2010
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Abstract
We recognize eight types of ferroan granitoid that can be distinguished on the basis of major element chemistry. These include alkalic granitoids that may be metaluminous or peralkaline, alkali-calcic granitoids that may be metaluminous, peraluminous or peralkaline, calc-alkalic granitoids that may be metaluminous or peraluminous, and rare calcic ferroan granitoids. These granitoids may form by two distinct end-member processes. Extreme differentiation of basaltic melts results in ferroan granitoids that are either peralkaline alkalic and alkali-calcic, or metaluminous alkalic, alkali-calcic, and calc-alkalic, with alkalinity increasing with increasing pressure of differentiation. Partial melting of tonalitic to granodioritic crust produces alkali-calcic to calc-alkalic granitoids that are metaluminous at low pressures and peraluminous at high pressures. It is likely that a combination of these two processes plays some role in the formation of most ferroan granitoids. Most granitoids that are referred to as 'A-type' are ferroan. However, the term 'A-type' has become more confusing than edifying because it has been applied to a broad spectrum of granitoid compositions with varying petrogenesis. For this reason we recommend that the term 'A-type' be discontinued and 'ferroan' used in its stead.
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| Authors | Carol D. Frost, Carol D. Frost |
| Journal | journal of petrology |
| Year | 2010 |
| DOI |
10.1093/petrology/egq070
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| URL | |
| Keywords | Keywords not found |
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