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Article Abstract:

The paleobiogeographic model which proposes that the Alexander terrane of Alaska is located in the Northern, rather than Southern, Hemisphere in the Late Silurian-Early Devonian, was developed within a Late Silurian paleogeographical context. It thus suggests the existence of an equatorial-subequatorial marine corridor, the Uralian Seaway, between Laurentia, Siberia and Baltica. The alternative continental reconstruction for Silurian continents is not congruent with this model.

Natural history, Alaska, Geology, Stratigraphic, Stratigraphy, Ural Mountains region, Paleogeography, Silurian period

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Article Abstract:

The garnet-chlorite-amphibole assemblage is capable of existing at pressures ranging from 2 to 3GPa as long as the temperature remains low enough for the continued stability of its hydrous phases. It is logical to assume that the precursor assemblage could have existed in a hydrous environment with pressure that is less than or equal to 3GPa and a temperature of about 725 degrees Celsius. It is possible for that hydrous environment to be in the crust or in the mantle.

Analysis, Peridotite, Minerals (Geology), Geomorphological research, Rocks, Amphiboles, Garnet, Rock-forming minerals

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