Boreskov

PP‐38fragments amygdule basalts were formed in the core crushing and penetration ofhydrothermal fluids, which indicates a clear connection with the Kyzyl‐Tashtyg hydrothermalore field. Basaltic fragments from the hydrothermal breccia rich in rounded amygdule (up to1 mm in diameter) filled microcrystalline gray mass, the crystallites of feldspar, epidote andclinozoisite. Usually in the central parts of the amygdule there are bright transparent crystalsof feldspar, closely associated with light‐green crystalline phases epidote. Sometimes albitelocated on the edges and the center amygdule ‐ epidote with bright colors with crossednicols. Analysis by scanning electron microscope showed that the gray microcrystalline massthat fills the volume of the amygdule, corresponds to the chemical composition of albite.Studies have shown that the material from which made tubular microihnofossils, in itschemical composition is most similar to epidote. Thus, the amygdales and microihnofossilsare made of minerals, formation of which, according to the albite‐epidote composition isclearly associated with hydrothermal processes that affected the basalts.This work was supported by program of RAS № 15 «The Origin and Evolution of geobiologicalsystems» and grant RFBR number 10‐05‐00953 and Integration Project № 98.Reference[1]. Zaikov V.V. Volcanism and sulphide hills paleookeanicheskih margins: the case of pyrite‐bearing zones inthe Urals and Siberia. Moscow: Nauka, 2006. – 429 p.[2]. Kanygin A.V., Tokarev D.A., Terleev A.A., Simonov V.A. New records of the Cambrian biota in the Kyzyl‐Tashyg ore field (Tyva) / Metallogeny of ancient and modern oceans. Miass: Imin UB RAS, 2007. ‐ P. 101‐107.[3]. Harald Furnes, Neil R. Banerjee, Hubert Staudigel, Karlis Muehlenbachs, Nicola McLoughlin, Maarten deWit, Martin Van Kranendonk. Comparing petrographic signatures of bioalteration in recent toMesoarchean pillow lavas: Tracing subsurface life in oceanic igneous rocks // Precambrian Research 2007.‐ V. 158, P. 156–176.[4]. Nicola Mcloughlin, Martin D. Brasier, David Wacey, Owen R. Green and Randall S. Perry. On BiogenicityCriteria for Endolithic Microborings onEarly Earth and Beyond // ASTROBIOLOGY 2007. ‐ V. 7, No. 1, P. 11‐26202