Partial pressure of carbon dioxide in the peter the great bay surface water in the autumn

During the hydrological survey from November 4 to 9, 2009, the underway measurements of pH, temperature, and salinity of the surface water in the Peter the Great Bay were carried out using the cell without the liquid junction in the running system. Using the measurement data, the partial pressure of carbon dioxide (pCO₂) was computed which was below its atmospheric value and varied from 290 to 360μatm. Thus, during the period under study, the surface water of the bay forms the runoff for the atmospheric carbon dioxide. The minimum values of pCO₂ are associated with the warm stream entering the bay from the southwestern part of the open sea. The maximum values of pCO₂ are associated with the local upwelling of bottom waters. It is suggested that the horizontal convection caused by the nonuniform cooling of coastal water in the autumn forms the revealed mesoscale dynamic structures.     

Ore-bearing Coaly Shales of the Lena Auriferous Region

Ore-bearing coaly shales of the Lena auriferous region (Patom Highland) are distinctly controlled by lithostratigraphic and structural factors. They are confined to carbonaceous and carbon-bearing (carbonate–terrigenous and terrigenous) lithologic varieties of primarily Au-rich black shales. However, the location of ore-bearing shales within these units is governed by structural factors. Gold mineralization and synore alterations are related to the tectonometasomatic reworking of substance of the geochemically favorable protoliths.     

Variability of sea surface temperature in the Japan Sea and its relationship to the wind-curl field

The variability of sea surface temperature (SST) in the Japan Sea is investigated using the complex EOF analysis of daily data produced at Tohoku University, Japan (New Generation SST; 2002–2006). The relationship with the wind field is investigated from the daily NCEP/NCAR reanalysis data with a 1° spatial resolution. Anomalies in the SST (SSTAs) are calculated by subtracting the basin-average annual variation estimated as a leading mode of temperature. The leading mode of an SSTA represents a adjustment to the annual mean variation, most significant in December in the zone of subtropical waters entering the sea through the Korean Strait and in the northwestern sea, over which a cyclonic wind curl develops in the cold period. The semiannual variability mode is identified, which is characterized by the largest temperature increase (decrease) in the western branch of the subarctic front (in the Tatar Strait), which lags by two months behind the semiannual changes in wind curl over the sea. An episodic SSTA movement is detected in the northern part of the sea, which moves from east to west along the western branch of the Tsushima Warm Current with a speed corresponding in magnitude to an advective scale.     

Early Paleozoic magmatism in the Bumbat-Hairhan area of the Lake Zone in western Mongolia (geological,petrochemical, and geochronological data)

We consider the structure, composition, and age of Early Paleozoic intrusive associations of the Bumbat-Hairhan area located in the central part of the island-arc system of the Lake Zone, western Mongolia. There are large polychronous plutons (Bumbat-Hairhan and Gundguzin) and small intrusions in this area. We have established that they are composed of granitoid and gabbroid associations of different lithology, ages, and geodynamic nature. The results of U-Pb dating show that granitoid and basic magmatism took place within 551–465 Ma. Two main stages of intrusive magmatism are recognized, which reflect two stages of the geodynamic evolution of the region: island-arc (551–524 Ma) and accretion–collision (511–465 Ma). At all stages, predominant rocks in the region were diorite–tonalite–plagiogranite and plagiogranite associations of calc-alkaline series..