A.N. SIROTKIN (STOCK VENTURE «PMGE»), A.N. EVDOKIMOV (SPMU)

New data on U­Pb dating of basic and ultrabasic metamorphosed intrusions in the north Ny­Friesland Peninsula (West Spitsbergen)

Geology of the north Ny­Friesland Peninsula (Spitsbergen Archipelago) are discussed based on data of geological surveys at a scale of 1:100,000. In the paper presented are new data on two metamagmatite complexes: ultrabasite and gabbroid, whose numerous bodies intrude the Early Proterozoic gneiss, quartzite, and amphibolite of the Atomfjella series. The ages of these metamagmatites (1471±13 and 1349±11 Ma, respectively) were first determined by the U­Pb zircon method that indicates endogenous processes of later stages of the old craton thermal activation.
Keywords: Spitsbergen, crystalline basement, ultrabasic rock, gabbro, metamorphism, zircon, U­Pb method.