4 research outputs found
Spatiotemporal Dynamics of Dilute Red Blood Cell Suspensions in Low-Inertia Microchannel Flow
Microfluidic technologies are commonly used for the manipulation of red blood cell (RBC) suspensions and analyses of flow-mediated biomechanics. To enhance the performance of microfluidic devices, understanding the dynamics of the suspensions processed within is crucial. We report novel, to our knowledge, aspects of the spatiotemporal dynamics of RBC suspensions flowing through a typical microchannel at low Reynolds number. Through experiments with dilute RBC suspensions, we find an off-center two-peak (OCTP) profile of cells contrary to the centralized distribution commonly reported for low-inertia flows. This is reminiscent of the well-known βtubular pinch effect,β which arises from inertial effects. However, given the conditions of negligible inertia in our experiments, an alternative explanation is needed for this OCTP profile. Our massively parallel simulations of RBC flow in real-size microfluidic dimensions using the immersed-boundary-lattice-Boltzmann method confirm the experimental findings and elucidate the underlying mechanism for the counterintuitive RBC pattern. By analyzing the RBC migration and cell-free layer development within a high-aspect-ratio channel, we show that such a distribution is co-determined by the spatial decay of hydrodynamic lift and the global deficiency of cell dispersion in dilute suspensions. We find a cell-free layer development length greater than 46 and 28 hydraulic diameters in the experiment and simulation, respectively, exceeding typical lengths of microfluidic designs. Our work highlights the key role of transient cell distribution in dilute suspensions, which may negatively affect the reliability of experimental results if not taken into account
Specific features of ore formation of Barun-Shiveinskoe tungsten deposit (Eastern Transbaikalia)
ΠΠΊΡΡΠ°Π»ΡΠ½ΠΎΡΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΡΡΠΎΠΈΡ Π² Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΠΈ ΡΠ°ΡΡΠΈΡΠ΅Π½ΠΈΡ ΠΌΠΈΠ½Π΅ΡΠ°Π»ΡΠ½ΠΎΠΉ ΡΡΡΡΠ΅Π²ΠΎΠΉ Π±Π°Π·Ρ Π ΠΎΡΡΠΈΠΈ. ΠΠΎΡΡΠΎΡΠ½ΠΎΠ΅ ΠΠ°Π±Π°ΠΉΠΊΠ°Π»ΡΠ΅ ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΎΠ΄Π½ΠΈΠΌ ΠΈΠ· ΡΡΠ°ΡΠ΅ΠΉΡΠΈΡ
Π³ΠΎΡΠ½ΠΎΡΡΠ΄Π½ΡΡ
ΡΠ΅Π³ΠΈΠΎΠ½ΠΎΠ² ΡΡΡΠ°Π½Ρ. ΠΠ°ΡΡΠ½-Π¨ΠΈΠ²Π΅ΠΈΠ½ΡΠΊΠΎΠ΅ ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΠ΅ ΠΎΡΠ½ΠΎΡΠΈΡΡΡ ΠΊ ΡΡΡΡΠ½ΠΎ-ΡΡΡΡΠΌΡΠ½ΠΎ-Π²ΠΎΠ»ΡΡΡΠ°ΠΌΠΎΠ²ΠΎΠΉ ΡΡΠ΄Π½ΠΎΠΉ ΡΠΎΡΠΌΠ°ΡΠΈΠΈ. ΠΠ»Ρ ΡΠ΅Π³ΠΈΠΎΠ½Π° ΠΎΡΡΡΠΎ ΡΡΠΎΠΈΡ Π²ΠΎΠΏΡΠΎΡ ΠΎ ΠΏΠΎΠΈΡΠΊΠ°Ρ
ΠΈ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΠΈ Π½ΠΎΠ²ΡΡ
ΡΡΠ΄Π½ΡΡ
ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΠΉ. ΠΠ»Ρ ΡΡΠΏΠ΅ΡΠ½ΠΎΠ³ΠΎ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΡ ΡΠ°ΠΊΠΎΠΉ Π·Π°Π΄Π°ΡΠΈ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΡ Π΄Π°Π½Π½ΡΠ΅ Π΄Π΅ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΈΠ·ΡΡΠ΅Π½ΠΈΡ ΡΠΆΠ΅ ΠΈΠ·Π²Π΅ΡΡΠ½ΡΡ
ΡΡΠ΄Π½ΡΡ
ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΠΉ, ΠΊΠΎΡΠΎΡΡΠ΅ ΠΌΠΎΠ³ΡΡ Π±ΡΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½Ρ Π΄Π»Ρ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠΈ Π½Π°ΡΡΠ½ΠΎ ΠΎΠ±ΠΎΡΠ½ΠΎΠ²Π°Π½Π½ΡΡ
ΠΊΡΠΈΡΠ΅ΡΠΈΠ΅Π² ΠΏΠΎΠΈΡΠΊΠ° ΡΡΠ΄Π½ΡΡ
ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΠΉ ΠΈ ΠΏΡΠΎΠ³Π½ΠΎΠ·Π° ΠΎΡΡΠ΄Π΅Π½Π΅Π½ΠΈΡ. Π ΡΠΈΡΠ»Ρ ΡΠ°ΠΊΠΈΡ
Π΄Π°Π½Π½ΡΡ
ΠΎΡΠ½ΠΎΡΠΈΡΡΡ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΠΈΡΡΠΎΡΠ½ΠΈΠΊΠΎΠ² ΡΡΠ΄ΠΎΠ½ΠΎΡΠ½ΡΡ
ΡΠ°ΡΠΏΠ»Π°Π²ΠΎΠ² ΠΈ ΡΡΠ»ΠΎΠ²ΠΈΠΉ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΠΉ ΡΡΡΡΠ½ΠΎ-ΡΡΡΡΠΌΡΠ½ΠΎ-Π²ΠΎΠ»ΡΡΡΠ°ΠΌΠΎΠ²ΠΎΠΉ ΡΡΠ΄Π½ΠΎΠΉ ΡΠΎΡΠΌΠ°ΡΠΈΠΈ. Π¦Π΅Π»ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠ²Π»ΡΠ΅ΡΡΡ Π΄ΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΡΡΡΠ²ΠΎ ΡΡΠ°ΡΡΠΈΡ Π² ΡΡΠ΄ΠΎΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΠΈ Π½Π΅ΡΠΊΠΎΠ»ΡΠΊΠΈΡ
ΡΡΠ΄ΠΎΠ½ΠΎΡΠ½ΡΡ
ΠΈΡΡΠΎΡΠ½ΠΈΠΊΠΎΠ² Ρ ΡΠ°Π·Π½ΡΠΌΠΈ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠ°ΠΌΠΈ Π½Π° ΠΎΡΠ½ΠΎΠ²Π°Π½ΠΈΠΈ Π΄Π°Π½Π½ΡΡ
ΠΈΠ·ΠΎΡΠΎΠΏΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°Π²Π° ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° ΡΡΠ΄ΠΎΠ½ΠΎΡΠ½ΠΎΠ³ΠΎ ΠΊΠ²Π°ΡΡΠ° ΠΈ ΡΠ΅ΡΡ ΡΡΠ»ΡΡΠΈΠ΄ΠΎΠ², Π° ΡΠ°ΠΊΠΆΠ΅ ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π° ΡΠ»Π΅ΠΌΠ΅Π½ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°Π²Π° ΠΊΠ²Π°ΡΡ-Π²ΠΎΠ»ΡΡΡΠ°ΠΌΠΈΡΠΎΠ²ΡΡ
ΡΡΠ΄ ΠΠ°ΡΡΠ½-Π¨ΠΈΠ²Π΅ΠΈΠ½ΡΠΊΠΎΠ³ΠΎ ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΡ Ρ ΡΠ»Π΅ΠΌΠ΅Π½ΡΠ½ΡΠΌ ΡΠΎΡΡΠ°Π²ΠΎΠΌ ΡΡΠ΄ ΠΊΠ²Π°ΡΡ-Π²ΠΎΠ»ΡΡΡΠ°ΠΌΠΈΡΠΎΠ²ΡΡ
ΡΡΠ΄ Π²ΠΎΠ»ΡΡΡΠ°ΠΌΠΎΠ²ΡΡ
ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΠΉ ΠΠΎΡΡΠΎΡΠ½ΠΎΠ³ΠΎ ΠΠ°Π±Π°ΠΉΠΊΠ°Π»ΡΡ. ΠΠ±ΡΠ΅ΠΊΡΠΎΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΠ°ΡΡΠ½-Π¨ΠΈΠ²Π΅ΠΈΠ½ΡΠΊΠΎΠ΅ Π²ΠΎΠ»ΡΡΡΠ°ΠΌΠΎΠ²ΠΎΠ΅ ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΠ΅, ΡΠ°ΡΠΏΠΎΠ»ΠΎΠΆΠ΅Π½Π½ΠΎΠ΅ Π² ΠΠΎΡΡΠΎΡΠ½ΠΎΠΌ ΠΠ°Π±Π°ΠΉΠΊΠ°Π»ΡΠ΅. ΠΠ΅ΡΠΎΠ΄Ρ. ΠΠ»Ρ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΡΠ»Π΅ΠΌΠ΅Π½ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°Π² ΠΏΠΎΡΠΎΠ΄ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π»ΡΡ ΡΠ΅Π½ΡΠ³Π΅Π½ΡΠ»ΡΠΎΡΠ΅ΡΡΠ΅Π½ΡΠ½ΡΠΉ ΠΌΠ΅ΡΠΎΠ΄ ΠΈ ΡΡΠ°Π½Π΄Π°ΡΡΠ½ΡΠΉ Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°Π½Π°Π»ΠΈΠ· Π² ΠΠ΅ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠΌ ΠΈΠ½ΡΡΠΈΡΡΡΠ΅ Π‘ΠΈΠ±ΠΈΡΡΠΊΠΎΠ³ΠΎ ΠΎΡΠ΄Π΅Π»Π΅Π½ΠΈΡ Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠΉ ΠΠΊΠ°Π΄Π΅ΠΌΠΈΠΈ ΠΠ°ΡΠΊ (ΠΠΠ Π‘Π Π ΠΠ, Π³. Π£Π»Π°Π½-Π£Π΄Ρ). ΠΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΠΈΠ·ΠΎΡΠΎΠΏΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°Π²Π° ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΎΡΡ Π² Π°Π½Π°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠΎΠΌ ΡΠ΅Π½ΡΡΠ΅ (ΠΠΠ Π‘Π Π ΠΠ, Π³. Π£Π»Π°Π½-Π£Π΄Ρ) Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΡΡΡΠ°Π½ΠΎΠ²ΠΊΠΈ MIR 10-30 ΡΠΈΡΡΠ΅ΠΌΡ Π»Π°Π·Π΅ΡΠ½ΠΎΠ³ΠΎ Π½Π°Π³ΡΠ΅Π²Π° Ρ Π»Π°Π·Π΅ΡΠΎΠΌ CO2 ΠΌΠΎΡΠ½ΠΎΡΡΡΡ 100 Π²Π°ΡΡ ΠΈ Π΄Π»ΠΈΠ½ΠΎΠΉ Π²ΠΎΠ»Π½Ρ 10,6 ΠΌΠΊΠΌ Π² ΠΈΠ½ΡΡΠ°ΠΊΡΠ°ΡΠ½ΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ, Π² ΠΏΡΠΈΡΡΡΡΡΠ²ΠΈΠΈ ΡΠ΅Π°Π³Π΅Π½ΡΠ° BrF5 ΠΏΠΎ ΠΌΠ΅ΡΠΎΠ΄Ρ Z.D. Sharp (1990). ΠΠ·ΡΡΠ΅Π½ΠΈΠ΅ ΡΠΎΡΡΠ°Π²Π° ΠΌΠΈΠ½Π΅ΡΠ°Π»ΠΎΠ² ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΠΈΠ»ΠΎΡΡ Π² ΠΠΠ Π‘Π Π ΠΠ Π½Π° ΡΠ°ΡΡΡΠΎΠ²ΠΎΠΌ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΠΌ ΠΌΠΈΠΊΡΠΎΡΠΊΠΎΠΏΠ΅ LEO-1430VP Ρ ΡΠ½Π΅ΡΠ³ΠΎΠ΄ΠΈΡΠΏΠ΅ΡΡΠΈΠΎΠ½Π½ΡΠΌ ΡΠΏΠ΅ΠΊΡΡΠΎΠΌΠ΅ΡΡΠΎΠΌ INCA Energy 350 (OxfordInstruments) ΠΏΡΠΈ ΡΡΠΊΠΎΡΡΡΡΠ΅ΠΌ Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΠΈ 20 ΠΊΠ, ΡΠΎΠΊΠ΅ Π·ΠΎΠ½Π΄Π° ΠΌΠ΅Π½ΡΡΠ΅ 0,5 Π½A, ΡΠ°Π·ΠΌΠ΅ΡΠ΅ Π·ΠΎΠ½Π΄Π° 0,1 ΠΌΠΊΠΌ. Π ΡΠ΅ΠΆΠΈΠΌΠ΅ Π°Π½Π°Π»ΠΈΠ·Π° Π²ΡΠ΅ΠΌΡ Π½Π°Π±ΠΎΡΠ° ΡΠΏΠ΅ΠΊΡΡΠΎΠ² ΡΠΎΡΡΠ°Π²ΠΈΠ»ΠΎ 50 Ρ. ΠΠ·ΡΡΠ΅Π½ΠΈΠ΅ ΠΈΠ·ΠΎΡΠΎΠΏΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°Π²Π° ΡΠ΅ΡΡ ΡΡΠ»ΡΡΠΈΠ΄ΠΎΠ² ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΎ Π² ΡΠ΅Π½ΡΡΠ΅ ΠΊΠΎΠ»Π»Π΅ΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΠΌΠ½ΠΎΠ³ΠΎΡΠ»Π΅ΠΌΠ΅Π½ΡΠ½ΡΡ
ΠΈ ΠΈΠ·ΠΎΡΠΎΠΏΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ Π‘Π Π ΠΠ (Π³. ΠΠΎΠ²ΠΎΡΠΈΠ±ΠΈΡΡΠΊ). Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. ΠΠ·ΠΎΡΠΎΠΏΠ½ΡΠΉ ΡΠΎΡΡΠ°Π² ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° Π²ΠΎ ΡΠ»ΡΠΈΠ΄Π΅ Π² ΡΠ°Π²Π½ΠΎΠ²Π΅ΡΠΈΠΈ Ρ ΠΊΠ²Π°ΡΡΠ΅ΠΌ ΠΏΡΠΎΠ΄ΡΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΡΡΠ°ΠΏΠ° ΠΏΡΠΈ 210-150 Β°Π‘ ΡΠΎΡΡΠ°Π²Π»ΡΠ΅Ρ 4,25-14,22 β°, ΡΡΠΎ ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΠ΅Ρ Π²ΠΎΠ΄Π½ΠΎΠΌΡ ΡΠ»ΡΠΈΠ΄Ρ ΠΌΠ°Π³ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΡΠΈΡΠΎΠ΄Ρ. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ ΠΈΠ·ΠΎΡΠΎΠΏΠ½ΡΠΉ ΡΠΎΡΡΠ°Π² ΡΠ΅ΡΡ ΠΊΠΈΠ½ΠΎΠ²Π°ΡΠΈ, Π·Π°ΠΊΠ»ΡΡΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΡΡΠ΄Π½ΠΎΠΉ ΡΡΠ°Π΄ΠΈΠΈ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΡ, ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠΈΠΉ ΠΌΠ°Π½ΡΠΈΠΉΠ½ΡΠΌ Π·Π½Π°ΡΠ΅Π½ΠΈΡΠΌ. Π£Π·ΠΊΠΈΠΉ ΠΈΠ½ΡΠ΅ΡΠ²Π°Π» Π·Π½Π°ΡΠ΅Π½ΠΈΠΉ ΡΠ΅ΡΡ ΠΊΠΈΠ½ΠΎΠ²Π°ΡΠΈ [delta] 34S, β° CDT ΠΎΡ -3,5 Π΄ΠΎ -4,5 ΡΠΊΠ°Π·ΡΠ²Π°Π΅Ρ Π½Π° ΠΈΡ
Π΅Π΄ΠΈΠ½ΡΠΉ ΠΈΡΡΠΎΡΠ½ΠΈΠΊ. ΠΠΏΠ΅ΡΠ²ΡΠ΅ Π½Π° ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΎ Π½Π°Π»ΠΈΡΠΈΠ΅ ΡΠ΅Π΄ΠΊΠΈΡ
ΠΌΠΈΠ½Π΅ΡΠ°Π»ΠΎΠ² ΠΊΠΈΠ½ΠΎΠ²Π°ΡΠΈ (ΠΌΠ΅ΡΠ°ΡΠΈΠ½ΠΎΠ±Π°ΡΠΈΡ, ΠΊΠΎΡΠ΄Π΅ΡΠΎΠΈΡ), ΠΎΠ±ΡΠ°Π·ΡΡΡΠΈΡ
ΡΡ Π² Π·ΠΎΠ½Π°Ρ
ΠΎΠΊΠΈΡΠ»Π΅Π½ΠΈΡ ΡΡΡΡΠ½ΡΡ
ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΠΉ ΠΏΡΠΈ Π½ΠΈΠ·ΠΊΠΎΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ½ΡΡ
ΡΡΠ»ΠΎΠ²ΠΈΡΡ
. ΠΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ ΠΈΡ
ΡΠ»Π΅ΠΌΠ΅Π½ΡΠ½ΡΠΉ ΡΠΎΡΡΠ°Π². Π ΠΊΠ²Π°ΡΡ-Π²ΠΎΠ»ΡΡΡΠ°ΠΌΠΈΡΠΎΠ²ΡΡ
ΡΡΠ΄Π°Ρ
Π²ΠΎΠ»ΡΡΡΠ°ΠΌΠΎΠ²ΡΡ
ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΠΉ ΠΠΎΡΡΠΎΡΠ½ΠΎΠ³ΠΎ ΠΠ°Π±Π°ΠΉΠΊΠ°Π»ΡΡ, Π² ΡΠΎΠΌ ΡΠΈΡΠ»Π΅ ΠΠ°ΡΡΠ½-Π¨ΠΈΠ²Π΅ΠΈΠ½ΡΠΊΠΎΠ³ΠΎ, Π²ΡΡΠ²Π»Π΅Π½Π° ΡΠ΅ΡΠ½Π°Ρ ΠΊΠΎΡΡΠ΅Π»ΡΡΠΈΠΎΠ½Π½Π°Ρ ΡΠ²ΡΠ·Ρ (r - 0,53-0,96) Ρ ΡΡΠ΄ΠΎΠΌ ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ² (As, Ta, Nb, Hf), ΡΠ²ΠΈΠ΄Π΅ΡΠ΅Π»ΡΡΡΠ²ΡΡΡΠ°Ρ ΠΎΠ± Π΅Π΄ΠΈΠ½ΡΡ
ΠΈΡΡΠΎΡΠ½ΠΈΠΊΠ°Ρ
ΠΈΡ
ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ. Π€ΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΡΡΠ΄ ΠΠ°ΡΡΠ½-Π¨ΠΈΠ²Π΅ΠΈΠ½ΡΠΊΠΎΠ³ΠΎ ΠΌΠ΅ΡΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΡ ΠΏΡΠΎΡ
ΠΎΠ΄ΠΈΠ»ΠΎ ΠΈΠ· ΡΠ°Π·Π½ΠΎΡΡΠΎΠ²Π½Π΅Π²ΡΡ
ΡΡΠ΄ΠΎΠ½ΠΎΡΠ½ΡΡ
ΠΈΡΡΠΎΡΠ½ΠΈΠΊΠΎΠ². ΠΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΠ΅ Π²ΠΎΠ»ΡΡΡΠ°ΠΌΠΈΡΠΎΠ² ΠΏΡΠΎΠΈΡΡ
ΠΎΠ΄ΠΈΠ»ΠΎ Π·Π° ΡΡΠ΅Ρ ΠΊΠΎΡΠΎΠ²ΠΎΠ³ΠΎ ΠΈΡΡΠΎΡΠ½ΠΈΠΊΠ°, ΡΡΡΡΠΈ - ΠΌΠ°Π½ΡΠΈΠΉΠ½ΠΎΠ³ΠΎ.The relevance of the study is in the need to expand the mineral resource base of Russia. Eastern Transbaikalia is one of the oldest mining regions of the country. Barun-Shiveinskoe field is mercury-antimony-tungsten ore formations. For the region, there is an urgent need to search for and discover new ore deposits. For successful completion of such a task, the data are needed from a detailed study of already known ore deposits, which can be used to develop scientifically reasonable criteria for searching for ore deposits and forecasting mineralisation. Such data includes determination of sources of ore-bearing melts and conditions of formation of mercury-antimony-tungsten ore formation deposits. The aim of the study is to prove participation in ore formation of several ore-bearing sources with different characteristics based on the data of isotopic composition of oxygen of ore-bearing quartz and sulphur sulfides, as well as comparative analysis of elemental composition of quartz-wolframite ores of Barun-Shiveinskoe deposit with quartz-wolframite ores of tungsten deposits in Eastern Transbaikalia. Object of the study is Barun-Shiveinskoe tungsten deposit located in Eastern Transbaikalia. Methods. To determine the elemental composition of rocks, the X-ray fluorescence method and standard chemical analysis were used at the Geological Institute of the Siberian Branch of the Russian Academy of Sciences (GIN SB RAS, Ulan-Ude). Oxygen isotopic composition was determined at the analytical centre (GIN SO RAS, Ulan-Ude) using a MIR 10-30 laser heating system with a 100 Watt CO2 laser and a 10,6 [mu]m wavelength in the infrared region, in the presence of the BrF5 reagent using the Z.D. Sharp method (1990). Mineral composition study was carried out in GIN SO RAS on the LEO-1430VP scanning electron microscope with the INCA Energy 350 energy dispersion spectrometer (Oxford Instruments) at an accelerating voltage of 20 kV, probe current is less than 0,5 nA, probe size is 0,1 Β΅m. In the analysis mode, the spectral set time was 50 s. Isotope composition of sulphur sulfides study was carried out at the collective use centre for multi-element and isotope studies of the Siberian Branch of the Russian Academy of Sciences (Novosibirsk). Results. The isotopic composition of oxygen in the fluid was determined in equilibrium with quartz of the productive stage at 210-150 Β°C, varying from 4,25 to 14,22 β°, which corresponds to aqueous fluid of magmatic nature. The isotopic composition of sulfur cinnabar, the final ore stage of the deposit formation, corresponding to mantle values, has been established. A narrow interval of [delta] 34S, β° CDT values for cinnabar sulphur from -3,5 to to -4,5 indicates a single source. For the first time, a rare cinnabaric minerals (metacinobarite, corderoite) formed in the oxidation zones of mercury deposits under low-temperature conditions were identified at the deposit. Their elemental composition was determined. In quartz-wolframite ores from tungsten deposits in Eastern Transbaikalia, including Barun-Shiveinskoe, a close correlation relation (r - 0,53-0,96) with a number of elements (As, Ta, Nb, Hf) was identified, indicating common sources of their formation. Ore formation at Barun-Shiveinskoe deposit was carried out from different levels of ore-bearing sources. Wolframites were formed from a crust source and mercury - from a mantle one