Krzeminska, Ewa; Wiszniewska, Janina; Williams, Ian
The oldest geochronological results between 2.69-2.57 Ga was previously obtained by using K-Ar method on biotite from pegmatite from Jastrzebna IG-1 borehole. In consequence, in many published reports up to 1998, the Mazowsze (or Masovian) granitoid massif has been regarded as Archean age structure. Therewithal, other rocks in the area, e.g. Bargłów gneiss sequence traditionally were described as Archean in age. In the paper we present new U-Pb SHRIMP zircon and monazite results for above...[Show more]
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