Experimentelle Gesteinsmetamorphose--II : Bildung von anatektischen granitischen Schmelzen bei der Metamorphose von NaCl-führenden kalkfreien Tonen

Details Experimentelle Gesteinsmetamorphose--II : Bildung von anatektischen granitischen Schmelzen bei der Metamorphose von NaCl-führenden kalkfreien Tonen Experimentelle Gesteinsmetamorphose--II : Bildung von anatektischen granitischen Schmelzen bei der Metamorphose von NaCl-führenden kalkfreien Tonen

Nov 1958

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1958gecoa..15...91w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 15, Issue 1-2, pp.91-112

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22

Scientific paper

Illite-quartz clays to which NaCl was added (to allow for saline solutions in the rock pores) were hydrothermally and isochemically treated between 350° and 800°C under 2000 atm of H 2 O pressure. The results are compared with the experimental metamorphism and ultrametamorphism of the NaCl-free clay. Below 390°C no reactions take place but at 390° illite + kaolinite + NaCl + H 2 O + Ca give muscovite + chlorite + Ab-rich plagioclase + HCl + H 2 O. The next reaction follows at about 550°C giving rise to the mineral assemblage cordierite, biotite, muscovite, plagioclase and quartz; chlorite is now absent. At this temperature the amphibolite facies is reached and at 600°, 625° or 665° (depending on the Na content) the pyroxen-hornfels facies is entered with the assemblage alkalifeldspar, cordierite, biotite ± sillimanite-mullite, plagioclase and quartz; muscovite is now absent. At 670° and 720°C, respectively, the cordierite-gneisses derived from the NaCl-containing clays give rise to anatectic melts of granitic composition and calc-alkaline character. Since these melts comprise up to two-thirds of the previous cordierite-gneisses they are believed to have a fundamental bearing on the genesis of granites.

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