Das Relief der Andenwestflanke bei Antofagasta (Nordchile) unter dem Einfluß langfristiger und extremer Trockenheit

Abele, Gerhard

doi:10.3112/erdkunde.1987.04.04

Cited by 1 publication

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“…a). In the hyperarid setting of northern Chile, these slopes are the combined product of the slow salt‐ and gravity‐related surficial displacement of material (salt‐creep), granular flows, and the lack of linear fluvial erosion (Mortensen, ; Abele, , ). These hillslope deposits are made up of well‐sorted, horizontally stratified and cross‐bedded sandy and coarser detritus, lacking a sedimentary matrix, with a thickening of the layers downslope.…”

Section: Resultsmentioning

confidence: 99%

“…The modern upper limit of living trees (‘treeline’, Figs a and 5) is characterized by a zone of non‐climatic struggle between valley floor vegetation that depends on the presence of perennial surficial water and groundwater in the Río Lluta floodplain deposits, and the vegetation‐bare hillslopes with extreme aridity and active gravitational processes, mainly surficial creep, induced by wetting and drying of salt (Abele, , ). This seems to be the present‐day process, reflecting the dry environmental conditions on the slopes.…”

Section: Discussionmentioning

confidence: 99%

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Palaeo‐geoecological significance of Pleistocene trees in the Lluta Valley, Atacama Desert

Veit

May

Madella

et al. 2016

J Quaternary Science

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In the Lluta Valley, northern Chile, climate is hyperarid and vegetation is restricted to the valley floors and lowermost footslopes. Fossil tree trunks and leaves of predominantly Escallonia angustifolia, however, are abundant up to $15 m above the present valley floor, where they are intercalated with slope deposits, reflecting higher water levels in the past. A total of 17 samples have been radiocarbon dated, yielding ages between 38 and 15k cal a BP. The youngest ages of 15.4k cal a BP are interpreted as reflecting the beginning of river incision and lowering of the valley floor, impeding the further growth of trees at higher parts of the slopes. The most plausible scenario for this observation is intensified river incision after 15.4k cal a BP due to increased stream power and runoff from the Río Lluta headwaters in the Western Cordillera and Altiplano corresponding to the highstand of the Tauca and Central Andean Pluvial Event (CAPE) wet phase. Ã Due to advanced degradation, these samples were prepared using the simplified acid-base-acid (ABA) method and corrected for an average age offset of À454 AE 209 years by comparison with the base-acid-baseacid-bleaching (BABAB) method, i.e. the standard method for wood analysis (Szidat et al., 2014).

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%