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049 a| EREE;

050 4 a| GB447b| .F37 2003;

100 1 a| Farabaugh, Renee L.,e| author.?| UNAUTHORIZED;

245 10 a| Sedimentology and geomorphology of the Rio Ramis Valley, Peru :b| climatic effects on fluvial landscapes /c| by Renee L. Farabaugh.;

264 0 c| 2003.;

300 a| 125 leaves :b| illustrations, maps (some color) ;c| 28 cm;

336 a| textb| txt2| rdacontent;

337 a| unmediatedb| n2| rdamedia;

338 a| volumeb| nc2| rdacarrier;

502 b| M.S.c| East Carolina Universityd| 2003;

500 a| Presented to the faculty of the Department of Geology.;

500 a| Advisor: Catherine A. Rigsby;

520 3 a| Fluctuations in regional precipitation and in base level (the level of Lake Titicaca) trigger changes the fluvial activity in the Rio Ramis Valley, Peru, that modify the landscape and affect human activity in the river valley. In this harsh high-altitude environment, the reliance of human livelihood and agricultural practices (both today and in the past) on arable fluvial landscapes makes an understanding of the relationship between fluvial landscape evolution and climate -the focus of this study -particularly relevant. In the Ramis Valley, relationships between fluvial sedimentation and terrace formation suggest that large-scale aggradational and downcutting events may be associated with specific climatic events in the Lake Titicaca basin and elsewhere on the Altiplano. Five terrace tracts (T1 through T5) present within the valley exhibit both paired and unpaired morphologies in reaches between bedrock constrictions, and sediments underlying the terraces record the deposition of both meandering and braided fluvial sediments in a valley previously occupied by a large paleolake. This depositional history, along with the geomorphology of the river valley, records five major aggradational and downcutting events that we relate to regional climate changes. As in other valleys in the Lake Titicaca region, downcutting is correlative with base level (Lake Titicaca level) fall and decreasing precipitation; aggradation is correlative with base level rise and increasing precipitation. The highest terrace in the valley -- T5 -- is underlain by a thick sequence of lacustrine strata that were deposited during an extremely wet period in the Lake Titicaca region at about 40,000 cal yr BP. These lacustrine strata were downcut, likely at a time of extreme drop in lake level, resulting in a deeply incised valley. The main phase of fluvial aggradation in the valley (sediments underlying the T4 through T2 terraces) was slow, spanning about 20,000 years. It occurred during LGM (from before 35,140 +/- 790 cal yr BP until about 10,421 +/- 181 cal yr BP), which was characterized in the Lake Titicaca basin by increased precipitation and high base levels. The aggradation resulted in almost 40 m of sediment in the valley, and was followed by rapid (about 2,000 years), but episodic, incision into the underlying sediments to form the T3 and T2 terraces, as well as the erosional surface beneath the modem fill terrace (Tl). This erosion corresponded to several periods of local base level (Lake Titicaca) lowering between 10,241 +/- 181 and 1,668 +/- 76 cal yr BP. The modem fill terrace has aggraded about 2 m above modem river level, likely within the last few thousand years.;

504 a| Includes bibliographical references (leaves 66-71).;

650 0 a| Climatic geomorphologyz| Peruz| Rio Ramis Valley.=| ^A68355;

650 0 a| Fluvisolsz| Peruz| Rio Ramis Valley.=| ^A231164;

650 0 a| Sediment transportz| Peruz| Rio Ramis Valley.=| ^A20741;

650 7 a| Climatic geomorphology.2| fast0| (OCoLC)fst00864276;

650 7 a| Fluvisols.2| fast0| (OCoLC)fst00928391;

650 7 a| Sediment transport.2| fast0| (OCoLC)fst01110959;

655 7 a| Academic theses.2| fast0| (OCoLC)fst01726453;

655 7 a| Academic theses.2| lcgft;

655 7 a| Thèses et écrits académiques.2| rvmgf0| (CaQQLa)RVMGF-000001173;

655 2 a| Academic Dissertation.0| (DNLM)D019478?| UNAUTHORIZED;

700 1 a| Rigsby, Catherine A.,e| degree supervisor.=| ^A1038604;

710 2 a| East Carolina University.b| Department of Geology.?| UNAUTHORIZED;

856 41 z| Access via ScholarShipu| http://hdl.handle.net/10342/11961;

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Sedimentology and geomorphology of the Rio Ramis Valley, Peru : climatic effects on fluvial landscapes / by Renee L. Farabaugh.

Author/creator	Farabaugh, Renee L. author.
Other author	Rigsby, Catherine A., degree supervisor.
Other author	East Carolina University. Department of Geology.
Format	Theses and dissertations
Production	2003.
Description	125 leaves : illustrations, maps (some color) ; 28 cm
Supplemental Content	Access via ScholarShip
Subjects	Climatic geomorphology--Peru. --Rio Ramis Valley. Fluvisols--Peru. --Rio Ramis Valley. Sediment transport--Peru. --Rio Ramis Valley.

Summary	Fluctuations in regional precipitation and in base level (the level of Lake Titicaca) trigger changes the fluvial activity in the Rio Ramis Valley, Peru, that modify the landscape and affect human activity in the river valley. In this harsh high-altitude environment, the reliance of human livelihood and agricultural practices (both today and in the past) on arable fluvial landscapes makes an understanding of the relationship between fluvial landscape evolution and climate -the focus of this study -particularly relevant. In the Ramis Valley, relationships between fluvial sedimentation and terrace formation suggest that large-scale aggradational and downcutting events may be associated with specific climatic events in the Lake Titicaca basin and elsewhere on the Altiplano. Five terrace tracts (T1 through T5) present within the valley exhibit both paired and unpaired morphologies in reaches between bedrock constrictions, and sediments underlying the terraces record the deposition of both meandering and braided fluvial sediments in a valley previously occupied by a large paleolake. This depositional history, along with the geomorphology of the river valley, records five major aggradational and downcutting events that we relate to regional climate changes. As in other valleys in the Lake Titicaca region, downcutting is correlative with base level (Lake Titicaca level) fall and decreasing precipitation; aggradation is correlative with base level rise and increasing precipitation. The highest terrace in the valley -- T5 -- is underlain by a thick sequence of lacustrine strata that were deposited during an extremely wet period in the Lake Titicaca region at about 40,000 cal yr BP. These lacustrine strata were downcut, likely at a time of extreme drop in lake level, resulting in a deeply incised valley. The main phase of fluvial aggradation in the valley (sediments underlying the T4 through T2 terraces) was slow, spanning about 20,000 years. It occurred during LGM (from before 35,140 +/- 790 cal yr BP until about 10,421 +/- 181 cal yr BP), which was characterized in the Lake Titicaca basin by increased precipitation and high base levels. The aggradation resulted in almost 40 m of sediment in the valley, and was followed by rapid (about 2,000 years), but episodic, incision into the underlying sediments to form the T3 and T2 terraces, as well as the erosional surface beneath the modem fill terrace (Tl). This erosion corresponded to several periods of local base level (Lake Titicaca) lowering between 10,241 +/- 181 and 1,668 +/- 76 cal yr BP. The modem fill terrace has aggraded about 2 m above modem river level, likely within the last few thousand years.
General note	Presented to the faculty of the Department of Geology.
General note	Advisor: Catherine A. Rigsby
Dissertation note	M.S. East Carolina University 2003
Bibliography note	Includes bibliographical references (leaves 66-71).
Genre/form	Academic theses.
Genre/form	Academic theses.
Genre/form	Thèses et écrits académiques.

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Sedimentology and geomorphology of the Rio Ramis Valley, Peru : climatic effects on fluvial landscapes / by Renee L. Farabaugh.

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