Marble (Sar-e-Sang Deposit, Sakhi Formation, Precambrian, 2.4-2.7 Ga (?); Sar-e-Sang Mining District, Hindu-Kush Mountains, Afghanistan) : 無料・フリー素材/写真
Marble (Sar-e-Sang Deposit, Sakhi Formation, Precambrian, 2.4-2.7 Ga (?); Sar-e-Sang Mining District, Hindu-Kush Mountains, Afghanistan) / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | Marble from the Precambrian of Afghanistan. (~3.3 centimeters across at its widest)Marble is an intermediate- to high-grade, crystalline-textured metamorphic rock. It is principally composed of calcite (CaCO3, calcium carbonate) and forms by regional metamorphism or contact metamorphism of limestone. This example is from Afghanistan's famous Sar-e-Sang Lapis Lazuli Deposit in the Hindu Kush Mountains.Stratigraphy: marble member, Sakhi Formation, Anglich Group, Sar-e-Sang Series, Late Archean to early Paleoproterozoic (?), ~2.4 to 2.7 Ga metamorphic date (the chronometric age comes from dating inferred correlative rocks in Pamir in adjacent Tajikhistan)Geologic context: eastern limb of the Kokcha Anticline, Fayzabad Metamorphic Massif, South Badakhshan BlockLocality: Sar-e-Sang Mining District, above the lowermost reaches of the Sar-e-Sang River, northern Kuran Wa Munjan District, southern Badakhshan Province, northern flanks of the western Hindu-Kush Mountains, northeastern Afghanistan (the Sar-e-Sang Mine adits are apparently in the vicinity of 36° 12.2’ to 36° 14.14’ North latitude, 70° 47.85’ to 70° 48.63’ East longitude) |
| 撮影日 | 2025-03-03 12:15:23 |
| 撮影者 | James St. John |
| タグ | |
| 撮影地 |