|Cueros de Purulla|
Cueros de Purulla is a volcano in Argentina. It consists of a lava dome and an associated ignimbrite. A large eruption dated to c. 7820 BP deposited ash into the Valles Calchaquies.
The volcano lies in Catamarca Province of Argentina 60–70 kilometres (37–43 mi) southeast of Antofagasta de la Sierra. Cerro Blanco volcano lies 25 kilometres (16 mi) south of Cueros de Purulla.
It is the northern of two lava domes which lie at the southern end of the Sierra de Calalaste. 180 kilometres (110 mi) from it. The upper unit is formed by ignimbrites and pyroclastic density current deposits.The dome is accompanied by ignimbrites and a debris deposit consisting of obsidian lies at the foot of the dome. Two volcanic fallout units are associated with Cueros de Purulla. A lower fallout unit consisting of lapilli and volcanic ash extends several kilometres from the volcano, and remnants occur as far as
Volcanic rocks erupted at Cueros de Purulla include rhyolite. Mineralogically, the rocks contain allanite, amphibole, apatite, biotite, clinopyroxene, epidote, feldspar, ilmenite, magnetite, muscovite, quartz, titanite and zircon. 4,380 metres (14,370 ft) in the form of blocks and nodules of various colours, and is of high quality. Reportedly, gold and silver can be found at the volcano.For the past five millennia, the volcano has been used as a source of obsidian, which occurs at
The lava dome at Cueros de Purulla is 400,000 ± 100,000 years old.A large eruption occurred during the Holocene, 7820 years before present (i.e. about 5870 BC). Deposits from this eruption form the Cerro Paranilla Ash in the Calchaquí Valleys. The eruption was highly explosive, forming a buoyant cloud.
The 6th millennium BC spanned the years 6000 BC to 5001 BC. It is impossible to precisely date events that happened around the time of this millennium and all dates mentioned here are estimates mostly based on geological and anthropological analysis. This millennium is reckoned to mark the end of the global deglaciation which had followed the Last Glacial Maximum and caused sea levels to rise by some 60 m (200 ft) over a period of about 5,000 years.
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