Abstract
This review mainly concerns Proterozoic deformed massif anorthosites occurring in the Grenville Province and its South Norwegian extension (Rogaland). Evidence of syn-emplacement deformation during Grenvillian times contradicts the hypothesis of tectonic reworking. Long cooling histories at depth, or rejuvenation by partial melting of older solid masses can explain that ages older than Grenvillian are measured in the anorthosite. No unique magma is parental to the anorthosite suite. Acidic rocks can result from anatexis or from fractionation of jotunitic liquids. Most jotunites are not comagmatic with massif anorthosites, but are produced by partial melting of crustal rocks basic to intermediate compositions. Massif anorthosites contain giant Al-opx (7–9% A12O3, plagioclase exsolutions) produced by cotectic crystallization from basic liquids at depth. They are carried to the level of emplacement either by an hyper-feldspathic liquid, which intrudes shallower magma chambers in atectonic conditions; or, by a plagioclase crystal mush, which rises diapirically and deforms its envelope and its own mass.
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Duchesne, JC. (1984). Massif Anorthosites: Another Partisan Review. In: Brown, W.L. (eds) Feldspars and Feldspathoids. NATO ASI Series, vol 137. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-6929-3_11
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