Granitization of Paleoproterozoic high-pressure metagabbro-norites of the Belomorian Group in Gorelyi Island, Kandalaksha Bay area, Baltic Shield

Korikovsky, S. P.; Khodorevskaya, L. I.

doi:10.1134/s086959110605002x

Cited by 13 publications

(7 citation statements)

References 27 publications

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“…The glasses (quenched melts) from the runs with pure water and with very dilute NaCl solutions are richer in SiO 2 than the glasses from the runs with concentrated solutions Na + 2 [4] Al + [6] Al, p.f.u. are natural amphiboles (Korikovsky and Khodorevskaya, 2006;Shcherbakova, 1988 ( Table 4). The SiO 2 concentrations of the glasses strongly negatively correlate with the NaCl concentra tions of the fluid (Fig.…”

Section: Quench Products Of the Melt And Fluidmentioning

confidence: 99%

“…Field studies (Gavrikova, 1987;Shcherbakova, 1988;Petrov and Makrygina, 1975;Khodorevskaya, 2005;Korikovsky and Khodorevskaya, 2006;Korik ovsky and Aranovich, 2010) and petrologic models based on their results (Newton et al, 1998;Korikovsky and Aranovich, 2010;Aranovich et al, 2014) suggest that transformations of mafic rocks into plagiogranite and charnockite (successions of zones in granitization aureoles) are induced by fluid phases of complex com position. With the progress of the metasomatic pro cess, pyroxenes are replaced by amphiboles and biotite, edenite and tschermakite in metabasites are transformed into pargasite and hastingsite (Ed Tch → Prg Hs) whose Fe mole fractions increase.…”

Section: Geologic Implicationsmentioning

confidence: 99%

“…Melting of mag nesian pargasite in the presence of pure H 2 O and fluids with various H 2 O/CO 2 ratios, and anhydrous melting of Prg, was studied in (Holloway, 1973;Holloway and Ford, 1975), whereas amphibole interaction with NaCl solutions has never been examined experimen tally, although field observations indicate that varia tions in the composition of this mineral may be induced by its interaction with aqueous salt solutions. For example, variations in the fluid composition can account for a systematic increase in the Fe mole frac tion and concentrations of alkalis in this mineral and, in certain instances, also its enrichment in halogens in zones of metasomatic granitization produced by infil trating fluids (Korikovsky and Khodorevskaya, 2006;Korikovsky and Aranovich, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of amphibole interaction with H2O–NaCl Fluid at 900°C, 500 MPa: toward granulite facies melting and mass transfer

Khodorevskaya

Aranovich

2016

Petrology

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Interaction between natural pargasite [Prg, SiO 2 = 43.89 wt %, FeO/(FeO + MgO) = 0.35, (Na + K) A = 0.51] and H 2 O-NaCl fluid, whose composition (NaCl mole fraction) varied within the range X NaCl = NaCl/(NaCl + H 2 O) = 0-0.45, was experimentally studied in an internally heated apparatus at 900°C and 500 MPa. Natural pargasite begins to melt at a temperature 120-150°C lower than its synthetic analogue. In the presence of pure H 2 O, the subliquidus mineral assemblage involves amphibole Hbl 1 , whose composition is closely similar to the starting Prg, clinopyroxene Cpx, calcic plagioclase Pl, and minor amounts of hercynite magnetite spinel. With increasing X NaCl , the subliquidus assemblage systematically changed: calcic plagioclase disappeared and more Fe rich amphibole Hbl 2 appeared at X NaCl = 0.07; Cpx dis appeared at X NaCl = 0.14; and appearance of Na Phl compositionally close to wonesite and almost complete disappearance of Hbl 1 was observed at X NaCl = 0.31. The composition of the melt also changed: its Na 2 O grad ually increased (from 1.5 to 9-10 wt %), and CaO and SiO 2 decreased(from 8.6 to 2 wt % and from 64 to 60 wt %, respectively, in recalculation to the anhydrous basis); at X NaCl ≥ 0.35, the melt was transformed from quartz to nepheline normative. The maximum Cl concentration of 1.2 wt % was measured in the melt poor est in SiO 2 . The experimental products contained spherical objects less than 10 μm in diameter that consisted of material that precipitated from the quenched fluid. These particles are richer than the melt in SiO 2 (62-80 wt %) and poorer in Al 2 O 3 (11-19 wt %) in experiments with X NaCl ≤ 0.24, but the differences between the compositions of the melt and particles decreased with increasing X NaCl . The relatively high concentrations of aluminosilicate material in the fluid is most likely explained by the high solubility of the melt in the fluid phase, with the formation in the fluid aqueous Si, Al-Si, Na-Al-Si, and other polymeric species. It is sug gested that interaction of host rocks with such fluids, rich in granitic components, might be responsible for granitization (charnockitization) of mafic, and, particularly, ultramafic rocks described in the literature.

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Section: Quench Products Of the Melt And Fluidmentioning

confidence: 99%

Section: Geologic Implicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental study of amphibole interaction with H2O–NaCl Fluid at 900°C, 500 MPa: toward granulite facies melting and mass transfer

Khodorevskaya

Aranovich

2016

Petrology

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“…The increase in the Fe mole fractions of the rocks and their minerals with increasing intensity of charnockitization can be explained by the higher solubility and leaching rate of Mg than Fe. This tendency is also typical of lower tem perature granitization (Korikovsky and Khodorevskaya, 2006). 6.…”

Section: Charnockitization Of Opx Cpx Phl Qz Andmentioning

confidence: 78%

“…This con cept was first formulated by Korzhinskii (1952Korzhinskii ( , 1953Korzhinskii ( , 1976 and then developed by other researchers who proved (or simply documented) the key aspects of the model: operation of silicic-alkaline metasomatism at the front of granitization (charnockitization); progres sive debasification of the protolithic rocks fueled by this process (as is particularly pronounced in metaba sites); introduction of Si, K, and Na and simultaneous leaching and dissemination of Mg, Fe, and Ca; some times accompanied by redeposition of leached Mg, Fe, and Ca in the form of melanocratic selvages around anatectic rocks or in the outer peripheries of the charnockitization (granitization) front in the form of melanocratic basificate veins consisting of Grt, Hbl, Bt, Opx, and Cpx; progressive leucocratization of the rocks during the intermediate and final stages of the process; and finally, partial or complete melting of the most leucocratic domains (Gavrikova and Zharikov, 1984;Gavrikova, 1987;Zharikov, 1987;Zharikov and Gavrikova, 1987;Korikovsky, 1967;Korikovsky and Aranovich, 2010;Korikovsky and Khodorevskaya, 2006;Krylova et al, 1972;Levitsky, 2005;Letnikov et al, 2000;Perchuk, 1987;Perchuk et al, 1994Perchuk et al, , 2000Petrova and Levitskii, 1984;Ronen son, 1989;Sudovikov, 1956;Utenkov, 1989;Khodor evskaya and Korikovsky, 2007;Shcherbakova, 1988;Blattner, 2005;Dobmeier and Raith, 2000;Engel and Engel, 1958;Franz and Harlov, 1998;Hansen and Harlov, 2009;Hansen and Stük, 1998;Hansen et al, 1987;Harlov et al, 1998;Harlov and Wirth, 2000;Janardham et al, 1982;…”

Section: Introductionmentioning

confidence: 96%

Charnockitization of feldspar-free orthopyroxene-clinopyroxene-phlogopite metaultramafite in the lapland granulite belt, southern Kola Peninsula: Compositional trends of rocks and minerals, P-T parameters, and fluid regime

Korikovsky

Aranovich

2015

Petrology

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The paper presents data on the transformations in the mineralogy and mineral assemblages of quartz and feldspar free magnesian orthopyroxene-clinopyroxene-biotite metaultramafic granulites con verted into orthopyroxene-clinopyroxene-potassic feldspar-plagioclase-quartz charnockite. Within a 4 to 6 m aureole around the fluid conduit, the granulite has been affected by Na-K-Si-H 2 O-CO 2 -Cl-F brine. Thereby the magnesian metaultramafite has undergone progressive debasification and leucocratization: potassic feldspar, oligoclase, and quartz have been metasomatically formed in the interstitial space between the mafic minerals and replaced ortho and clinopyroxene and biotite. The Fe mole fractions X Fe of all mafic minerals increase toward the fluid conduit as follows: from 0.25 to 0.54 for Opx, from 0.15 to 0.32 for Cpx, and from 0.16 to 0.56 for Bt. The whole rock compositions suggest that Na, K, and Si have been introduced and Mg, Fe, and Ca removed from the protolith, so that the metaultramafic rock has gradually been transformed first into a mesocratic rock and then, when partial melting started in its most significantly debasified domains, into leucocratic nebulitic migmatite with skialiths of the modified granulite, then into charnockite migma, and eventually into magma. The composition of the charnockite forming fluid was estimated as = 0.6, X (Na,K)F = 0.3, and = 0.1. The unusual F rich composition of the fluid is reflected in that both Bt and Hbl are enriched in F and contain almost no Cl. The P-T parameters of the process, which took place at the metamorphic peak, were T ~ 780°C, P = 8.5 kbar. Material balance plots of the rocks revealed three petro logical trends of the charnockite forming process controlled solely by the composition of the brine: (a) a trend that did not produce either Bt or Hbl during the metasomatic and anatectic stages, (b) that associated with intense amphibolization and biotitization during the metasomatic stage, and (c) a trend associated with the origin of melanocratic metasomatic Opx-Cpx-Bt-Hbl ± Pl selvages around newly formed charnocki toids, with the composition of the selvages close to the melanocratic veins produced in the peripheries of the charnockitization zone by the rapid redeposition of Mg, Fe, and Ca mobilized in the course of debasification. It follows that charnockitization proceeded according to the model of nonisochemical migmatization in an open system, a process driven first of all by the inflow of deep brines. This process differed strongly from sim ple closed system partial melting induced by an increase in temperature.

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Geochemistry of granitization and magmatic replacement of basic volcanic rocks in the contact aureole of the Yurchik gabbronorite intrusion, Ganal Range, Kamchatka

et al. 2013

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Granitization of Paleoproterozoic high-pressure metagabbro-norites of the Belomorian Group in Gorelyi Island, Kandalaksha Bay area, Baltic Shield

Cited by 13 publications

References 27 publications

Experimental study of amphibole interaction with H2O–NaCl Fluid at 900°C, 500 MPa: toward granulite facies melting and mass transfer

Experimental study of amphibole interaction with H2O–NaCl Fluid at 900°C, 500 MPa: toward granulite facies melting and mass transfer

Charnockitization of feldspar-free orthopyroxene-clinopyroxene-phlogopite metaultramafite in the lapland granulite belt, southern Kola Peninsula: Compositional trends of rocks and minerals, P-T parameters, and fluid regime

Geochemistry of granitization and magmatic replacement of basic volcanic rocks in the contact aureole of the Yurchik gabbronorite intrusion, Ganal Range, Kamchatka

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