By Professor Lewis D. Ashwal (auth.)

The concept for a booklet on anorthosites got here to me in January of 1986 whereas returning to Houston after vacation festivities in Dallas. the unique thought used to be a evaluation paper on anorthosites, yet by the point I reached Houston, the subject matter I meditated induding used to be evidently too huge for a unmarried paper. The Director of the Lunar and Planetary Institute, Kevin Burke, used to be receptive to the belief of a booklet, and prompt that I touch Peter Wyllie, who serves as Editor of the Springer-Verlag sequence Minerals and Rocks. This attempt, which I initially anticipated may take a couple of 12 months, has taken approximately 6. i've got many excuses- indolence, relocating to a different continent, different commitments, etc.-but the elemental fact is that writing a e-book is far better an project than might be expected. many of us are conscious of this, and that i used to be duly forewarned. . yet why write a publication on anorthosites? it is a first-class query, which i've got thought of from many angles. One cause might be expressed when it comes to a comparability among anorthosite and basalt. A first-order knowing of basalt genesis has been extant for a few years. against this, there's little contract in regards to the beginning of anorthosite. There are solid purposes for learning and writing approximately basalt: it's the such a lot plentiful rock kind at the Earth's floor, and is usually considerable at the surfaces of the opposite terrestrial planets.

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Extra info for Anorthosites

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Megacrystic anorthosites occur within relatively undeformed sills at Bird River and Pipestone Lake, Manitoba (Bond 1973; Trueman 1980; Phinney et al. 1983b; Scoates 1983). Large masses of megacrystic anorthosite also occur, the original shapes and dispositions of which are difficult to determine due to intense structural complexity, lack of exposure, or both. The largest of these occurrences is the Shawmere anorthosite complex of Ontario, which consists of two masses, 750 km 2 and 75 km 2 , surrounded by high grade gneissic amphibolite, tonalite, and minor paragneiss (Simmons et al.

1983) is probably a consequence of later transpressive wrench faulting (Poulsen 1986). The relatively poorly exposed Dore Lake (Allard 1970) and Bell River (Freeman 1939) complexes of Quebec have both been mapped as parts of large-scale fold structures, complicated by later faulting. In both cases, the anorthosites can be shown to 16 Archean Megacrystic Anorthosites Fig. 2. Typical texture of Archean megacrystic anorthosite, Pipestone Lake, Manitoba Magmatic Textures and Structures 17 be parts of layered complexes, but the original forms of the intrusions are not known in detail.

Accessory sulfides in the Cu-Fe-Ni-Co-S system are most abundant in ultramafic units of the Fiskenresset and Sittampundi complexes, and have been described by Bishop et al. (1980) and Windley et al. (1981). Archean anorthosites of the Dore Lake complex, Quebec, are host to extensive Cu-Au mineralization. The ores occur as lenticular bodies within 48 Archean Megacrystic Anorthosites shear zones and fractures associated with the pervasive lower greenschist facies metamorphism that affected the complex.

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