NDLI: The geochemistry of Lower Proterozoic mafic to felsic igneous rocks , Rombak Window , North Nor -

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The geochemistry of Lower Proterozoic mafic to felsic igneous rocks , Rombak Window , North Nor -

Content Provider	Semantic Scholar
Author	Sawyer, Edward W. Korneliussen
Copyright Year	2009
Abstract	The supracrustal sequence 01 the Rombak Basement Window, cons isting 01 volcanic rocks, pelitic sediments , greywackes with minor amounts 01 carbonate rocks and quartz ites, was intruded by mal ic dykes, malic to intermediate plutons and a variety 01 granitoid batholiths c. 1.6-1.7 Ga ago. The region has experienced amphibolite-grade metamorphism, followed by retrogression to greensch ist facies along Caledonian shear-zones. On the basis of their petrographic ano geochem ical characteristics the volcanic rocks can be divided into 3 suites: (1) high-Mg basalts : (2) malic to leisic voicanites with lair ly high potass ium contents and with calc-alkaline affinities ; and (3) low-potass ium, calc-alkaline felsic volcanites. Based on major element geochemis try the evolution of the potas sic voicani tes is interpre ted to have been controneo , in the case 01 malic -intermediate varieties, by early fractionation of Fe, Mg-rich minerals , and by plagioclase crystallisation for the lelsic varieties. Suites 2 and 3 are similar to associated granites and granodiorites in their chemical composit ion. It is concluded that the volcano-sedimentary and intrusive rocks were formed in an Lower Praterozoi c mature magmatic arc environment at the southern margin of a continent composed predomi nantly 01 Archaean tona litic granitoid rocks and Lower Proterozoic greenstone terranes .
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.ngu.no/FileArchive/NGUPublikasjoner/Bulletin415_7-21.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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