Baltic Brown Granite
Baltic Brown Granite
It starts with H.H.Read's famous "all kinds of granite" statement made in 1933, in fact, there are at least 20 proposed granite classification schemes (see Barbarin, 1990, 1999 summary;(Frost et al. 2001).The most common classification scheme is the geochemical and/or genetic alphabetical classification scheme. For example, granite is classified into S type, I type, M type, A type and C type.Type I is magmatic origin;M type is mantle source.Type A is anhydrous granite;C is for Perilla granite);Or it can be divided into calc-alkaline, alkaline, over-alkaline, over-aluminum and aluminaceous granite, etc.;Or according to tectonic background, it can be divided into "orogenic" granite (oceanic and continental volcanic arc;Continental collision zone, "post-orogenic" granite (post-orogenic uplift or subsidence area), and non-" orogenic "granite (continental rift, hot spot, mid-ocean ridge, oceanic island).
In Finland, seidholm (1893) originally opposed the Canadian Lawson (A, C.Lawson had argued that the oldest granite intruding into the original crust and oldest sedimentary rocks was formed by remelting the oldest sediments at the bottom.Seedholm (1892) believed that cycloplastic granites were true magmatic rocks, which, during periods of intense vertical movement, allowed magma to fill graben-like depressions when cycloplastic granites made large intrusions.Seidholm later developed his own concepts of regeneration and antecedency for other granites, which were in part consistent with Lawson's concepts in Canada.When T/gerstedt, 1893, described some of the mixed rocks of southern Finland (later known as migmatites), he published a slightly different concept.He believed that the rocks were formed by the injection of granitic material into a piece of gneiss in the metamorphic sediments.This granitic material contains a considerable amount of water, which accelerates the process of action and causes the granitic material to form tiny veins that penetrate into gneiss.He then reintroduced the existence of water to explain the formation of fine-grained rock veins with narrow resistance extending long distances.Explaining their formation in other ways would be quite difficult.
A brief introduction to Baltic brown granite products:
Some pictures of Baltic brown granite products are displayed: