Cr-spinels in carbonate veins of the Onguren Complex (Western Baikal Region)

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Рұқсат ақылы немесе тек жазылушылар үшін

Аннотация

Cr-spinels in carbonate veins of the Ongurensky complex (Eastern Siberia, Western Baikal region) are mainly represented by ferrichromite and crommagnetite (MgO ≤0.3 wt %, Mg# ≤0.04, Al2O3 ≤2.5 wt%; Cr# 0.91—1.00, Fe2+/Fe3+ 0.8—1.4) with a high content of ZnO (0.9—4.6 wt %). In the calcite vein, titanium chrommagnetite is transformed into chromium-containing titanomagnetite, which decomposes into less titanium magnetite and ilmenite at 970—1000 °С and fO2 is about +0.5 ÷ +0.7 QFM. In the dolomite vein, ferrichromite and chrommagnetite grains contain relic cores of subferrialumochromite (Al2O3 10.6—14.4 wt %, Cr# 0.63—0.73, Fe2+/Fe3+ 4.1—5.2, MgO ≤0.52 wt %) with increased amounts of ZnO (3.7—5.1 wt %), TiO2 (3.2—4.1 wt %), and MnO (0.6—1.1 wt %). Ferrichromite and chrommagnetite are formed during high-temperature (>600 °C) metamorphism of the vein. Superimposed deformations in conditions of greenschist facies lead to the formation of magnetite rims around the grains of chromomagnetite.

Толық мәтін

Рұқсат жабық

Авторлар туралы

Valentina Savelyeva

Institute of the Earth's Crust SB RAS

Хат алмасуға жауапты Автор.
Email: vsavel@crust.irk.ru
ORCID iD: 0000-0002-9238-4763
SPIN-код: 7732-3485
Scopus Author ID: 55038714000

Candidate of Geological and Mineralogical Sciences, Senior Researcher, Laboratory of Petrology, Geochemistry and Ore Genesis

Ресей, 664033, Irkutsk, Lermontov St., 128

Ekaterina Bazarova

Institute of the Earth's Crust SB RAS

Email: bazarova@crust.irk.ru
ORCID iD: 0000-0002-6644-2659
SPIN-код: 2613-5874
Scopus Author ID: 36701080300

Candidate of Geological and Mineralogical Sciences, Junior Researcher, Laboratory of Petrology, Geochemistry and Ore Genesis

664033, Irkutsk, Lermontov St., 128

Elena Khromova

Geological Institute of the Siberian Branch of the RAS

Email: lena.khromova.00@mail.ru
Scopus Author ID: 56971248000

Junior Researcher, Laboratory of Instrumental Methods of Analysis

670047, Ulan-Ude, Sakhyanova st., 6a

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