Formation of adakitic granitoids in the collisional orogens: Evidence from the Early Paleozoic granitoids of the Munku–Sardyk Range, Eastern Sayan

Examination of sand grain surfaces from early Paleozoic sandstones by electron microscopy reveals a variety of secondary effects caused by rock-forming processes after final deposition of the sand. Detailed studies were conducted on both coarse (≥0.71mm) and fine (=0.25mm) fractions of St. Peter Sandstone, a widespread sand deposit underlying much of the U.S. Central Interior and used in the glass industry because of its remarkably high silica purity.The very friable sandstone was disaggregated and sieved to obtain the two size fractions, and then cleaned by boiling in HCl to remove any iron impurities and rinsed in distilled water. The sand grains were then partially embedded by sprinkling them onto a glass slide coated with a thin tacky layer of latex. Direct platinum shadowed carbon replicas were made of the exposed sand grain surfaces, and were separated by dissolution of the silica in HF acid.

Download Full-text

GEOCHEMISTRY, Sm-Nd, Rb-Sr, and Lu-Hf ISOTOPES, SOURCES, AND CONDITIONS OF FORMATION OF EARLY PALEOZOIC PLAGIOGRANITOIDS IN THE SOUTH OF THE LAKE ZONE IN WESTERN MONGOLIA

Russian Geology and Geophysics ◽

10.15372/rgg2019087 ◽

2020 ◽

Keyword(s):

Hf Isotopes ◽

Early Paleozoic ◽

The South ◽

Western Mongolia ◽

Lake Zone

Download Full-text

To the lichen flora of Oka Plateau (Eastern Sayan, Republic of Buryatia)

Novosti sistematiki nizshikh rastenii ◽

10.31111/nsnr/2009.43.229 ◽

2009 ◽

Vol 43 ◽

pp. 229-245 ◽

Cited By ~ 1

Author(s):

I. N. Urbanavichene ◽

G. P. Urbanavichus

Keyword(s):

Lichen Species ◽

Southern Siberia ◽

Eastern Sayan ◽

First Time ◽

Lichen Flora

New data on the distribution of 329 lichen species in Oka Plateau (Eastern Sayan, Southern Siberia, Republic of Buryatia) are presented. 7 species are reported for the first time for lichen flora of Russia: Leptogium furfuraceum, Melanelixia villosella, Myxophora leptogiophila, Pachyphiale ophiospora, Physcia cf. integrata, Polycoccum clauzadei, Stigmidium psorae. 14 species are recorded for the first time to Southern Siberia: Arthonia clemens, Bacidina delicata, Caloplaca saxifragarum, Lecidea septentrionalis, Leciophysma finmarkicum, Leptogium intermedium, Phaeosporobolus alpinus, Rhizocarpon frigidum, Rinodina metaboliza, R. olivaceobrunnea, Tetramelas chloroleucus, T. phaeophysciae, Weddellomyces tartaricola, Xanthoria stiligera. The records of Myxophora leptogiophila, Pachyphiale ophiospora, Polycoccum clauzadei, Stigmidium psorae, Weddellomyces tartaricola are the first to Asia.

Download Full-text