World rocks photo collection
155 millions years
Submitted 3 years 2 months ago by rock.
Russia, Magadan region, left side of the Duck river. Quartz-albite diorite porphyrite with quartz-albite veins. These are the famous Ducks dykes. Dyke №7. The dyke is a slab-like body with a capacity of 0.5 m in the East to 3.5 m in the West, accompanied by apophyses that run parallel to the sedimentary rocks (lower Jurassic siltstone). It is traced to a depth of 250 meters. Xenoliths are rare. Sometimes there are intersecting, until the disappearance of dykes. Porphyrites are sericitized, albitized, chloritized, and carbonated in the areas of ore veins and veins, and in the areas of their maximum concentration they are intensively arsenopyritized and pyritized. Contain gold. Upper Jurassic.
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