Pegmatitic chrome-diopsidite (Inagli Complex, Early Cretaceous, ~129-136 Ma; Inagli Deposit, WSW of Aldan, Siberia, Russia) 3 : 無料・フリー素材/写真
Pegmatitic chrome-diopsidite (Inagli Complex, Early Cretaceous, ~129-136 Ma; Inagli Deposit, WSW of Aldan, Siberia, Russia) 3 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Pegmatitic chrome-diopsidite ("Yakut emerald") from the Cretaceous of Russia. (cut & polished surface; ~10.5 centimeters across at its widest)This rare rock comes from a gem mining operation near Aldan in Siberia, Russia. The material is chrome diopside (chromian diopside), a chromium-rich variety of pyroxene, Ca(Mg,Cr)Si2O6 - calcium magnesium chromium silicate. It comes from a pegmatitic chrome-diopsidite "vein" (dike) intruding dunites at the core of the Inagli Complex, a Cretaceous-aged, alkaline, ultramafic igneous intrusion. "Chrome-diopside" is the name of the mineral; "chrome-diopsidite" is the name of the ~monomineralic rock having that mineral.Geologic unit: Inagli Complex (Inagli Massif), Early Cretaceous, ~132 Ma (published dates range from 129-136 Ma)Locality: gem quarry at the Inagli Deposit, 29 kilometers west-southwest of the town of Aldan, Siberia, Russia (58° 32' 10.77" North latitude, 124° 54' 50.45" East longitude)---------------------------------------------------Photo gallery of chrome-diopside:www.mindat.org/gallery.php?min=1033---------------------------------------------------Photo gallery of Inagli field shots & specimens:www.mindat.org/gallery.php?loc=216419---------------------------------------------------Info. on the Inagli Deposit:Mues-Schumacher et al. (1996) - Mineral chemistry and geochronology of the potassic alkaline ultramafic Inagli Complex, Aldan Shield, eastern Siberia. Mineralogical Magazine 60: 711-730.Naumov et al. (2008) - Inclusions of silicate and sulfate melts in chrome diopside from the Inagli Deposit, Yakutia, Russia. Geochemistry International 46: 554-564.Okrugin et al. (2018) - Mineralogical, geochemical, and age characteristics of the rocks of the Inagli-dunite-clinopyroxenite-shonkinite massif with platinum-chromite and Cr-diopside mineralization (Aldan Shield). Russian Geology and Geophysics 59: 1301-1317.Ponomarchuk et al. (2019) - 40Ar/39Ar geochronology of alkaline rocks of the Inagli Massif (Aldan Shield, southern Yakutia). Russian Geology and Geophysics 60: 33-44. |
| 撮影日 | 2021-04-21 19:31:36 |
| 撮影者 | James St. John |
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