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The 3.5 Ga Siurua trondhjemite gneiss in the Archaean Pudasjärvi Granulite Belt, northern Finland
Bulletin of the Geological Society of Finland
In the Archaean Pudasjärvi Complex the pyroxene-bearing rocks are considered to form a belt, the Pudasjärvi Granulite Belt (PGB). The major rock types of the PGB are metaigneous mafi c and felsic granulites, and trondhjemite gneisses. Red alaskites, white leucogranites and trondhjemitic pegmatoids are locally abundant. Ion microprobe U-Pb analyses on zircons suggest a magmatic age of ca. 3.5 Ga for the trondhjemite gneiss in Siurua, considered the oldest rock so far identifi ed in thedoi:10.17741/bgsf/75.1-2.004 fatcat:bik4go76bzcx5n64ig2ae57u4m