141 research outputs found
ΠΠ»ΠΈΡΠ½ΠΈΠ΅ Π½Π΅ΡΡΡΠ°Π½ΠΎΠ²ΠΈΠ²ΡΠ΅Π³ΠΎΡΡ ΡΠ΅ΠΆΠΈΠΌΠ° ΡΠΊΡΠΏΠ»ΡΠ°ΡΠ°ΡΠΈΠΈ Π½Π° ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½ΡΠ° ΠΏΡΠΎΠ΄ΡΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΡΠΊΠ²Π°ΠΆΠΈΠ½ Ρ ΡΡΠ΅ΡΠΈΠ½Π°ΠΌΠΈ Π³ΠΈΠ΄ΡΠΎΡΠ°Π·ΡΡΠ²Π° ΠΏΠ»Π°ΡΡΠ°
Π Π΄Π°Π½Π½ΠΎΠΉ Π²ΡΠΏΡΡΠΊΠ½ΠΎΠΉ ΠΊΠ²Π°Π»ΠΈΡΠΈΠΊΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΠ΅ Π±ΡΠ»ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΎ Π²Π»ΠΈΡΠ½ΠΈΠ΅ Π½Π΅ΡΡΡΠ°Π½ΠΎΠ²ΠΈΠ²ΡΠ΅Π³ΠΎΡΡ ΡΠ΅ΠΆΠΈΠΌΠ° ΡΠ΅ΡΠ΅Π½ΠΈΡ Π½Π° ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠ΅ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½ΡΠ° ΠΏΡΠΎΠ΄ΡΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΡΠΊΠ²Π°ΠΆΠΈΠ½ Ρ Π³ΠΈΠ΄ΡΠΎΡΠ°Π·ΡΡΠ²ΠΎΠΌ ΠΏΠ»Π°ΡΡΠ°. ΠΠ½Π°Π»ΠΈΠ·, ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠΌΡΠΉ Π² ΡΠ°ΠΌΠΊΠ°Ρ
Π΄Π°Π½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΡ ΠΏΠΎΠΊΠ°Π·Π°Π», ΡΡΠΎ Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡ Π²ΡΡ
ΠΎΠ΄Π° Π½Π° ΡΡΡΠ°Π½ΠΎΠ²ΠΈΠ²ΡΠΈΠΉΡΡ ΡΠ΅ΠΆΠΈΠΌ ΠΌΠΎΠΆΠ΅Ρ Π΄ΠΎΡΡΠΈΠ³Π°ΡΡ Π½Π΅ΡΠΊΠΎΠ»ΡΠΊΠΎ ΠΌΠ΅ΡΡΡΠ΅Π², Π² ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ ΠΊΠΎΡΠΎΡΡΡ
ΠΏΡΠΎΠ΄ΡΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΡΠΊΠ²Π°ΠΆΠΈΠ½ Ρ ΡΡΠ΅ΡΠΈΠ½Π°ΠΌΠΈ ΠΠ Π ΠΌΠΎΠΆΠ΅Ρ ΡΠ½ΠΈΠΆΠ°ΡΡΡΡ Π±ΠΎΠ»Π΅Π΅ ΡΠ΅ΠΌ Π² Π΄Π²Π° ΡΠ°Π·Π°. Π Ρ
ΠΎΠ΄Π΅ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΡ ΠΏΡΠΎΠ΅ΠΊΡΠ° Π±ΡΠ»Π° ΠΏΠΎΠ΄ΠΎΠ±ΡΠ°Π½Π° Π°Π½Π°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠ°Ρ ΠΌΠΎΠ΄Π΅Π»Ρ ΡΠ°ΡΡΠ΅ΡΠ° ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΡ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½ΡΠ° ΠΏΡΠΎΠ΄ΡΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ, ΠΎΡΠ½ΠΎΠ²Π°Π½Π½Π°Ρ Π½Π° Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΠΈ ΡΡΠ΅ΡΠΈΠ½Ρ, ΠΊΠΎΡΠΎΡΠ°Ρ ΠΈΠΌΠ΅Π΅Ρ ΠΌΠ΅Π½ΡΡΡΡ ΠΏΠΎΠ³ΡΠ΅ΡΠ½ΠΎΡΡΡ ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ ΡΡΡΠ΅ΡΡΠ²ΡΡΡΠ΅ΠΉ ΡΠΎΡΠΌΠΎΠΉ ΡΠ°ΡΡΠ΅ΡΠ° ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»Π΅ΠΉ ΠΠ’Π ΠΈ ΠΌΠΎΠΆΠ΅Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΡΡΡ Π½Π° ΠΏΡΠ°ΠΊΡΠΈΠΊΠ΅ Π΄Π»Ρ ΠΏΡΠΎΠ³Π½ΠΎΠ·ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π³Π΅ΠΎΠ»ΠΎΠ³ΠΎ-ΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΌΠ΅ΡΠΎΠΏΡΠΈΡΡΠΈΠΉ.In this work the estimation of productivity index decline was made. The analysis showed that the duration of transient period may last for a few months. During this period productivity index decline may be very significant. According to calculations, developed method has shown good matching between estimated and actual productivity index values. As it was estimated, this algorithm allows making prediction and forecasting of well behavior and accurate business planning
The partial equilibration of garnet porphyroblasts in pelitic schists and its control on prograde metamorphism, Glen Roy, Scotland
Garnet porphyroblasts in sillimanite-bearing pelitic schists contain complex
textural and compositional zoning, with considerable variation both within and
between adjacent samples. The sillimanite-bearing schists locally occur in
regional Barrovian garnet zone assemblages and are indicative of a persistent
lack of equilibrium during prograde metamorphism. Garnet in these Dalradian
rocks from the Scottish Highlands preserves evidence of a range of metamorphic
responses including initial growth and patchy coupled dissolution-
reprecipitation followed by partial dissolution. Individual porphyroblasts each
have a unique and variable response to prograde metamorphism and garnet with
mainly flat compositional profiles co-exists with those containing largely
unmodified characteristic bell-shaped Mn-profiles. This highlights the need for
caution in applying traditional interpretations of effective volume diffusion
eliminating compositional variation. Cloudy garnet with abundant fluid
inclusions is produced during incomplete modification of the initial
porphyroblasts and these porous garnet are then particularly prone to partial
replacement in sillimanite-producing reactions. The modification of garnet via a
dissolution-reprecipitation process releases Ca into the effective whole rock
composition, displacing the pressure-temperature positions of subsequent
isograd reactions. This represents the first report of internal metasomatism
controlling reaction pathways. The behaviour of garnet highlights the
importance of kinetic factors, especially deformation and fluids, in controlling
reaction progress and how the resulting variability influences subsequent
prograde history. The lack of a consistent metamorphic response, within and
between adjacent schists, suggests that on both local and regional scales these
rocks have largely not equilibrated at peak metamorphic conditions
Fe-Mg interdiffusion rates in clinopyroxene: Experimental data and implications for Fe-Mg exchange geothermometers
Chemical interdiffusion of Fe-Mg along the c-axis [001] in natural diopside crystals (XDi = 0.93) was experimentally studied at ambient pressure, at temperatures ranging from 800 to 1,200 Β°C and oxygen fugacities from 10-11 to 10-17 bar. Diffusion couples were prepared by ablating an olivine (XFo = 0.3) target to deposit a thin film (20-100 nm) onto a polished surface of a natural, oriented diopside crystal using the pulsed laser deposition technique. After diffusion anneals, compositional depth profiles at the near surface region (~400 nm) were measured using Rutherford backscattering spectroscopy. In the experimental temperature and compositional range, no strong dependence of DFe-Mg on composition of clinopyroxene (Fe/Mg ratio between Di93-Di65) or oxygen fugacity could be detected within the resolution of the study. The lack of fO2-dependence may be related to the relatively high Al content of the crystals used in this study. Diffusion coefficients, DFe-Mg, can be described by a single Arrhenius relation with (Formula presented). DFe-Mg in clinopyroxene appears to be faster than diffusion involving Ca-species (e.g., DCa-Mg) while it is slower than DFe-Mg in other common mafic minerals (spinel, olivine, garnet, and orthopyroxene). As a consequence, diffusion in clinopyroxene may be the rate-limiting process for the freezing of many geothermometers, and compositional zoning in clinopyroxene may preserve records of a higher (compared to that preserved in other coexisting mafic minerals) temperature segment of the thermal history of a rock. In the absence of pervasive recrystallization, clinopyroxene grains will retain compositions from peak temperatures at their cores in most geological and planetary settings where peak temperatures did not exceed ~1,100 Β°C (e.g., resetting may be expected in slowly cooled mantle rocks, many plutonic mafic rocks, or ultra-high temperature metamorphic rocks)
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