Reply: Late Quaternary deglacial history of the Mérida Andes, Venezuela: response to comment

Stansell, Nathan D.; Abbott, Mark B.; Polissar, P. J.; Wolfe, Alexander P.; Bezada, Maximiliano; Rull, Valentı́

doi:10.1002/jqs.1109

Cited by 3 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interpreting the onset of organic matter in the cores as the cessation of glacial input, they suggested that significant retreat of the associated glaciers occurred bỹ 15.7 ka cal BP in the Mucubají complex and~14.2 ka cal BP at sites to the northwest and across the Boconó fault in the Sierra Norte. The later discussion of Mahaney et al (2007a) and Stansell et al (2007a) elucidated uncertainties inherent in these studies. Regardless, the ages from the lakes and bogs are best interpreted as limiting dates and proxies of time of the emplacement of the major moraine complexes during the LLGM.…”

Section: Moraine Ages and Glacial Historymentioning

confidence: 94%

Toward quantifying geomorphic rates of crustal displacement, landscape development, and the age of glaciation in the Venezuelan Andes

et al. 2012

View full text Add to dashboard Cite

Section: Moraine Ages and Glacial Historymentioning

confidence: 94%

Toward quantifying geomorphic rates of crustal displacement, landscape development, and the age of glaciation in the Venezuelan Andes

et al. 2012

View full text Add to dashboard Cite

“…2), another important factor that must be considered is that past seismic activity can influence the amount and source of sediment (Audemard, 1997;Carrillo et al, 2008); however this does not explain why all three records presented here show similar patterns during the Holocene when the mapped faults that affect the Mucubají valley do not cut through either the Montos or Los Anteojos catchments (Hackley et al, 2005). Therefore glacial processes, and not seismic events or erosion by precipitation, are the primary control on clastic sediment input at these study sites (Stansell et al, 2007a).…”

Section: Discussionmentioning

confidence: 76%

“…We interpret the decreasing trend in clastic sediment during the middle Holocene in the Montos and Los Antejos records as an indication that the slopes of the watersheds stabilized following the early Holocene phase of ice retreat in those respective valleys rather than evidence of advancing ice. We assert, however, that it is difficult to explain the middle Holocene increase in clastic sediment accumulation in the Mucubají valley as anything other than evidence of an ice advance (Stansell et al, 2007a). Moreover, proxy records from the tropical Atlantic off the coast of Venezuela suggest that there was a shift to colder conditions during the first half of the middle Holocene when sedimentological evidence from the Andes suggests a glacial readvance occurred, followed by higher temperatures during the latter stages of the interval when ice apparently retreated ( Fig.…”

Section: The Middle-holocene (W80e40 Ka)mentioning

confidence: 67%

Proglacial lake sediment records reveal Holocene climate changes in the Venezuelan Andes

Stansell

Polissar

Abbott

et al. 2014

Quaternary Science Reviews

Self Cite

View full text Add to dashboard Cite

Lake sediment records from the Cordillera de Mérida in the northern Venezuelan Andes document the history of local glacial variability and climate changes during the Holocene (w12 ka to the present). The valleys that contain these lakes have similar bedrock compositions and hypsometries, but have different headwall elevations and aspects, which makes them useful for investigating the magnitude of past glaciations. There was widespread glacial retreat in the Venezuelan Andes during the early Holocene, after which most watersheds remained ice free, and thus far only valleys with headwalls higher than w4400 m asl contain evidence of glaciation during the last w10 ka. There was a pronounced shift in sediment composition for the Montos (headwall: w4750 m asl) and Los Anteojos (headwall: w4400 m asl) records during the middle Holocene from w8.0 to 7.7 ka when conditions appear to have become ice free and drier. There is tentative evidence that the glacier in the Mucubají valley (headwall: w4609 m asl) advanced from w8.1 to 6.6 ka and then retreated during the latter stages of the middle Holocene. Clastic sediment accumulation in other nearby lake basins was either low or decreased throughout most of the middle Holocene as watersheds stabilized under warmer and/or drier conditions. In the Montos record, there was another major shift in sediment composition that occurred from w6.5 to 5.7 ka, similar to other regional records that suggest conditions were drier during this period. Overall, the late Holocene was a period of warmer and wetter conditions with ice extent at a minimum in the northern tropical Andes. There were also punctuated decadal to multi-centennial periods of higher clastic sediment accumulation during the last w4 ka, likely in response to periods of cooling and/or local precipitation changes. In watersheds with headwalls above 4600 m asl, there is evidence of glacial advances during the Little Ice Age (w0.6e0.1 ka). The pattern of glacial variability is generally similar in both the northern and southern tropics during the Little Ice Age, suggesting that ice margins in both regions were responding to colder and wetter conditions during the latest Holocene. The observed pattern of Holocene climate variability in the Venezuelan Andes cannot be explained by insolation forcing alone, and tropical ocean influences were likely associated with the observed glacial and lake level changes.

show abstract

Abrupt Younger Dryas cooling in the northern tropics recorded in lake sediments from the Venezuelan Andes

Stansell

Abbott

Rull

et al. 2010

Earth and Planetary Science Letters

View full text Add to dashboard Cite

Reply: Late Quaternary deglacial history of the Mérida Andes, Venezuela: response to comment

Cited by 3 publications

References 22 publications

Toward quantifying geomorphic rates of crustal displacement, landscape development, and the age of glaciation in the Venezuelan Andes

Toward quantifying geomorphic rates of crustal displacement, landscape development, and the age of glaciation in the Venezuelan Andes

Proglacial lake sediment records reveal Holocene climate changes in the Venezuelan Andes

Abrupt Younger Dryas cooling in the northern tropics recorded in lake sediments from the Venezuelan Andes

Contact Info

Product

Resources

About