Modeling of the formation of nonisothermal zoning in magnesian skarns in the ore-magmatic fluid systems of intrusive traps of the southern Siberian Platform. / Mazurov, M. P.; Bykova, V. G.
In: Russian Geology and Geophysics, Vol. 58, No. 5, 01.05.2017, p. 541-550.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Modeling of the formation of nonisothermal zoning in magnesian skarns in the ore-magmatic fluid systems of intrusive traps of the southern Siberian Platform
AU - Mazurov, M. P.
AU - Bykova, V. G.
PY - 2017/5/1
Y1 - 2017/5/1
N2 - Using the Selector PC application, we studied the process of formation of magnesian skarns at the contact of dolerites with carbonate-salt deposits. The physicochemical parameters of metasomatic processes were estimated by studying the localization of skarn ore shoots and mineral assemblages in the deposits of the Angara-Ilim type. The action of magmatic fluids on the system dolerite-magnesian salt deposits and dolerite-carbonate-salt deposits resulted in zonal columns of infiltration magnesian skarns. The computation was carried out using a dynamic multireservoir model of a flow reactor with a constant temperature gradient and a uniform pressure. We have established that changes in the C/H ratio and Cl content in the fluid source affect the composition of the produced mineral assemblages. Depending on the temperature during the formation of skarns, different mineral assemblages are produced: diopside, enstatite, anorthite, quartz, ilmenite, hercynite, and pyrrhotite at 1040-1010 °C; monticellite, forsterite, magnetite, geikielite, periclase, spinel, calcite, and graphite at 980-740 °C; and calcite, dolomite, phlogopite, halite, and graphite at 710-380 °C. Wollastonite is observed in the rear zone of magnesian skarns. We examined the temperature-dependent sequence of formation of different types of silicates, spinels, and Ti-containing minerals in the metasomatic column. The computation results show that during crystallization, the tholeiitic magma releases a fluid phase with C/H = 0.1-1.0, amounting to 1.5-2.0 wt.%.
AB - Using the Selector PC application, we studied the process of formation of magnesian skarns at the contact of dolerites with carbonate-salt deposits. The physicochemical parameters of metasomatic processes were estimated by studying the localization of skarn ore shoots and mineral assemblages in the deposits of the Angara-Ilim type. The action of magmatic fluids on the system dolerite-magnesian salt deposits and dolerite-carbonate-salt deposits resulted in zonal columns of infiltration magnesian skarns. The computation was carried out using a dynamic multireservoir model of a flow reactor with a constant temperature gradient and a uniform pressure. We have established that changes in the C/H ratio and Cl content in the fluid source affect the composition of the produced mineral assemblages. Depending on the temperature during the formation of skarns, different mineral assemblages are produced: diopside, enstatite, anorthite, quartz, ilmenite, hercynite, and pyrrhotite at 1040-1010 °C; monticellite, forsterite, magnetite, geikielite, periclase, spinel, calcite, and graphite at 980-740 °C; and calcite, dolomite, phlogopite, halite, and graphite at 710-380 °C. Wollastonite is observed in the rear zone of magnesian skarns. We examined the temperature-dependent sequence of formation of different types of silicates, spinels, and Ti-containing minerals in the metasomatic column. The computation results show that during crystallization, the tholeiitic magma releases a fluid phase with C/H = 0.1-1.0, amounting to 1.5-2.0 wt.%.
KW - dolerites
KW - magnesian skarns
KW - metasomatism
KW - numerical modeling
KW - CONTACTS
KW - SEDIMENTARY COVER
KW - DOLERITE
KW - ROCK-SALT
UR - http://www.scopus.com/inward/record.url?scp=85019193377&partnerID=8YFLogxK
U2 - 10.1016/j.rgg.2016.10.012
DO - 10.1016/j.rgg.2016.10.012
M3 - Article
AN - SCOPUS:85019193377
VL - 58
SP - 541
EP - 550
JO - Russian Geology and Geophysics
JF - Russian Geology and Geophysics
SN - 1068-7971
IS - 5
ER -
ID: 10192542