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Metamorphic dolomitic marble-hosted talc from the Mulvoj area in the Western Pamir Mountains, Tajikistan Cover

Metamorphic dolomitic marble-hosted talc from the Mulvoj area in the Western Pamir Mountains, Tajikistan

Mineralogia
Volume 54 (2023): Issue 1 (January 2023)
By: Mohssen Moazzen,  Intizor Silmonov and  Sangin Elnazarov  
Open Access
|Aug 2023

Figures & Tables

Figure 1.

Geological Map of the Southwestern Pamirs (modified from Vlasov et al. 1991, Schwab et al. 2004 and Angiolini et al. 2013). The study area is indicated by a box.
Geological Map of the Southwestern Pamirs (modified from Vlasov et al. 1991, Schwab et al. 2004 and Angiolini et al. 2013). The study area is indicated by a box.

Figure 2.

Simplified geological map of the Mulvoj area in the Ishkashim district of Tajikistan (Based on Vlasov et al. 1991).
Simplified geological map of the Mulvoj area in the Ishkashim district of Tajikistan (Based on Vlasov et al. 1991).

Figure 3.

Field photos from the metamorphic rocks in the Mulvoj area. (A) Dolomitic marbles within the gneiss and schist. (B) Large open fold in the metamorphic rocks. (C) Tight folds in gneiss. (D) Tremolite along with carbonate in the dolomitic marble. (E) Rhombohedral pure calcite. (F) Talc in the Mulvoj mine site. (G) and (H) Remaining of old mining metal zip-lines and pillars.
Field photos from the metamorphic rocks in the Mulvoj area. (A) Dolomitic marbles within the gneiss and schist. (B) Large open fold in the metamorphic rocks. (C) Tight folds in gneiss. (D) Tremolite along with carbonate in the dolomitic marble. (E) Rhombohedral pure calcite. (F) Talc in the Mulvoj mine site. (G) and (H) Remaining of old mining metal zip-lines and pillars.

Figure 4.

Microscopic photos from different rock types in the Mulvoj area. (A) Dolomite with minor quartz. (B) dolomite, opaque minerals and idioblastic amphibole (tremolite) in a metamorphic dolostone. (C) Relatively large titanite in textural equilibrium with dolomite. (D) Talc sample with minor calcite.
Microscopic photos from different rock types in the Mulvoj area. (A) Dolomite with minor quartz. (B) dolomite, opaque minerals and idioblastic amphibole (tremolite) in a metamorphic dolostone. (C) Relatively large titanite in textural equilibrium with dolomite. (D) Talc sample with minor calcite.

Figure 5.

(A) XRD pattern for the studied talc sample. The vertical axis shows the intensity of peaks (proportional to the amount of the mineral phase in the studied sample) and the horizontal axis shows the 2Θ angle of the X-ray diffraction, which is indicative of the mineral phase. The sample is composed almost entirely from talc. (b) Classification of Mulvoj talc based on chlorite and carbonate content. Some talc occurrences are shown for comparison (Afghanistan from Tahir et al. 2018; Trimouns, France from Boutin et al. 2016; Montana, USA from Anderson et al., 1990; Austria, from Prochaska, 1989, Finland from GTK. www.gtk.fi).
(A) XRD pattern for the studied talc sample. The vertical axis shows the intensity of peaks (proportional to the amount of the mineral phase in the studied sample) and the horizontal axis shows the 2Θ angle of the X-ray diffraction, which is indicative of the mineral phase. The sample is composed almost entirely from talc. (b) Classification of Mulvoj talc based on chlorite and carbonate content. Some talc occurrences are shown for comparison (Afghanistan from Tahir et al. 2018; Trimouns, France from Boutin et al. 2016; Montana, USA from Anderson et al., 1990; Austria, from Prochaska, 1989, Finland from GTK. www.gtk.fi).

Figure 6.

Al2O3-Fe2O3(T)-MgO diagram classifies the Mulvoj talc as Mg-rich talc with very small Fe and Al content.
Al2O3-Fe2O3(T)-MgO diagram classifies the Mulvoj talc as Mg-rich talc with very small Fe and Al content.

Figure 7.

(A) Selected elements concentration in the Mulvoj talc samples normalized to the chondrite values (McDonough, Sun 1995). (B) Elements concentration patterns normalized to the upper continental crust values (Taylor, McLennan 1985). Peridotite-related samples from Turkey (Yalçin, Bozkaya 2006) and Poland (Gil et al. 2022) are shown for comparison.
(A) Selected elements concentration in the Mulvoj talc samples normalized to the chondrite values (McDonough, Sun 1995). (B) Elements concentration patterns normalized to the upper continental crust values (Taylor, McLennan 1985). Peridotite-related samples from Turkey (Yalçin, Bozkaya 2006) and Poland (Gil et al. 2022) are shown for comparison.

Figure 8.

Phase relations for the studied rock samples in the CMSH-CO2 compatibility diagrams with H2O and CO2 as the excess phases. Tie lines define the mineral reactions. (A): Dol+Qtz assemblage, (B): Tlc+Cal±Qtz assemblage (C): Tr-forming reaction.
Phase relations for the studied rock samples in the CMSH-CO2 compatibility diagrams with H2O and CO2 as the excess phases. Tie lines define the mineral reactions. (A): Dol+Qtz assemblage, (B): Tlc+Cal±Qtz assemblage (C): Tr-forming reaction.

Figure 9.

Temperature-XCO2 diagram for talc formation in the siliceous system with binary H2O-CO2 fluid (Tahir et al. 2018). Stability field for talc + calcite and talc + calcite + tremolite are indicated.
Temperature-XCO2 diagram for talc formation in the siliceous system with binary H2O-CO2 fluid (Tahir et al. 2018). Stability field for talc + calcite and talc + calcite + tremolite are indicated.

Major oxides of the studied samples by XRF (wt%)_

Sample No.DetectionMVJ1MVJ2MVJ3MVJ4MVJ5MVJ6
Rock typeLimit (wt %)TalcTalcTalcTalcTalcMarble
SiO20.0560.7661.0760.4159.7360.123.21
TiO20.050.080.080.070.070.08<0.05
Al2O30.051.351.261.141.141.181.28
BaO0.05<0.05<0.05<0.05<0.05<0.05<0.05
CaO0.050.190.120.140.190.1829.07
Fe2O3*0.050.640.710.750.610.590.62
K2O0.050.310.320.300.290.31<0.05
MgO0.0532.2933.2131.9832.5532.6420.76
MnO0.05<0.05<0.05<0.05<0.05<0.050.17
Na2O0.050.270.220.300.270.290.19
P2O50.05<0.05<0.050.06<0.05<0.050.09
SO30.05<0.05<0.05<0.05<0.05<0.05<0.05
Total-95.8996.9995.1594.8595.3955.39

Trace and rare earth element (REE) composition of the analysed talc samples by ICP-MS; all in ppm_

SampleDL*MVJ1MVJ2MVJ3SampleDLMVJ1MVJ2MVJ3
Ag0.5<0.5<0.5<0.5Pb1444
As51.51.51.4Sb50.880.790.86
Be1<1<1<1Sc0.50.80.80.7
Cd0.10.350.340.35Sr2666
Ce1111Th5<5<5<5
Co11<11U5<5<5<5
Cr1<1<1<1V1121211
Cu1322Y0.5<0.5<0.5<0.5
La1111Yb0.20.20.20.2
Li1161716Zn1<1<1<1
Mo0.50.550.530.55Zr5<5<5<5
Ni11199     
DOI: https://doi.org/10.2478/mipo-2023-0004 | Journal eISSN: 1899-8526 | Journal ISSN: 1899-8291
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Language: English
Page range: 31 - 42
Submitted on: Feb 24, 2023
|
Accepted on: Jun 12, 2023
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Published on: Aug 4, 2023
Published by: Mineralogical Society of Poland
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year
Keywords:
Talc,
meta-dolomite,
mineral reactions,
Pamir,
Tajikistan
Related subjects:
Geosciences,
Geophysics,
Geosciences, other

© 2023 Mohssen Moazzen, Intizor Silmonov, Sangin Elnazarov, published by Mineralogical Society of Poland
This work is licensed under the Creative Commons Attribution 4.0 License.

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