Cabana (ancient lake)

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Lake Cabana is an ancient lake in the Altiplano.

The lake reached a water level of 3,900 metres (12,800 ft) over the central and northern Altiplano,[1] 90 metres (300 ft) above the current lake levels of Lake Titicaca.[2] The Capalla-Ulloma sill, which separates the Altiplano into a northern and southern basin,[3] did not exist at that time and it did not split up the Cabana lake body. It left deposits reaching thicknesses of 50 metres (160 ft) of thickness;[4] they have been found on the western and eastern sides of the basin.[2] Erosion platforms and terraces covered with gravels[5] and other wave cut structures are remnants of Lake Cabana.[6]

In 1984, this lake was named by a group of researchers

Lake Minchin and Lake Tauca.[9] An erosion surface at 3,900 metres (12,800 ft) elevation and associated clays were formerly attributed with Ballivián[10][11] but today shorelines at that elevation are instead associated with Cabana.[1]

The lake existed about 1 million years ago. It was preceded by Lake Mataro and succeeded by

Lake Escara and Lake Ballivian, the latter in the north and the former in the south.[1] The Kaluyo glaciation preceded the formation of Lake Cabana,[4] earlier it was believed that the 3,900 metres (12,800 ft) high formations predated any glaciation.[12] A phase of tectonic extension in the Titicaca basin may have favoured the formation of this lake.[13] The existence of this lake may have facilitated the diversification of Heleobia snails, but increased speciation only occurred during the subsequent Ballivian episode.[14]

References

  1. ^
    S2CID 56399697
    .
  2. ^ a b Wirrmann et al. 1992, p. 40.
  3. ^ Wirrmann et al. 1992, p. 10.
  4. ^ a b Wirrmann et al. 1992, p. 8.
  5. ^ Newell 1949, p. 91.
  6. ^ Newell 1949, p. 92.
  7. doi:10.1016/S0031-0182(01)00301-7
    .
  8. ^ Lavenu, A.; Fornari, M.; Sebrier, M. (1984). "Existence de deux nouveaux izpisodes lacustres Quaternaires dans l'altiplano péruvo-bolivien" (PDF). Cah ORSTOM Sér Géol (in French). 15 (1): 107.
  9. ISBN 978-0-521-03168-4
    .
  10. OCLC 602709757.{{cite book}}: CS1 maint: location missing publisher (link
    )
  11. ^ Newell 1949, p. 82.
  12. ^ Newell 1949, p. 85.
  13. ^ Wirrmann et al. 1992, p. 12.
  14. PMID 22957159
    .

Sources

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