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Full-Text Articles in Physical Sciences and Mathematics
Glacial Lacustrine Records Of Holocene Climate Variations In The Tropical Peruvian Andes, Sasha Rothenberg
Glacial Lacustrine Records Of Holocene Climate Variations In The Tropical Peruvian Andes, Sasha Rothenberg
Honors Theses
Lake sediment cores taken from glacial lakes and wetlands are valuable proxies of glacial activity because they offer a continuous record of sediment input. Tropical alpine glaciers are especially sensitive to changes in precipitation and temperature, and thus the history of glaciation can be used in the reconstruction of past climates. Owing to a steep east-‐to-‐west moisture gradient across the Andes, glaciers in the eastern cordillera are more sensitive to changes in temperature whereas those in the drier, western, cordillera are more sensitive to changes in precipitation. Multiple lacustrine sediment cores were taken from two sites in the central Peruvian …
Petrologic Evidence For Mafic Recharge At Volcán Barú, Western Panama: Implications For A Late Pleistocene Sector Collapse, Shannon M. Brady
Petrologic Evidence For Mafic Recharge At Volcán Barú, Western Panama: Implications For A Late Pleistocene Sector Collapse, Shannon M. Brady
Honors Theses
The purpose of this study is to gain a better understanding of the petrologic conditions of the magma chamber beneath Volcán Barú in western Panama. Volcán Barú is an andesite stratovolcano that experienced a large sector collapse during the Late Pleistocene, which destabilized the southwestern flank of its edifice. Samples were taken from the cores of hummocks and megaclasts deposited as a result of this sector collapse, which are inferred to have been intact wall rock from the pre-collapse edifice. These samples range in composition from 51.8 to 61.7 wt. % SiO2 and have a geochemical signature that is consistent …