Lily J. Jackson

Lily J. Jackson
University of Wyoming | UW · School of Energy Resources

Ph.D. Geosciences

About

21
Publications
8,913
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148
Citations
Citations since 2016
18 Research Items
148 Citations
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2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040

Publications

Publications (21)
Article
The onset of orogenic shortening in the northern Andes Mountains coincided with latest Cretaceous accretion of the Caribbean oceanic plateau. We present isotopic data (εHf in zircon and εNd) coupled with arc position to test whether accretion led to abrupt crustal thickening in the northern Andes of Ecuador and Colombia. A rapid isotopic excursion...
Article
Full-text available
Cenozoic sedimentary rocks of the intermontane Bagua Basin record the Andean orogenic history of northern Peru at ~4–7°S. The northern Peruvian Andes define the northern termination of the Central Andes and are comprised of a narrow, low‐elevation orogen relative to the rest of the Central Andes. New stratigraphic and sedimentologic field observati...
Article
Full-text available
Recognizing detrital contributions from sediment source regions is fundamental to provenance studies of active and ancient orogenic settings. Detrital zircon U-Pb geochronology of unconsolidated sands from modern rivers that have source catchments with contrasting bedrock signatures provides insight into the fidelity of U-Pb age signatures in discr...
Article
The Cretaceous Alamor-Lancones Basin is located in the forearc region of southern Ecuador and northern Peru. The eastern (Río Playas) domain includes the upper stratigraphic levels of the 1800m thick basin-!ll succession. Sedimentological, provenance and chronostratigraphic analyses of the Río Playas region help to elucidate the Late Cretaceous to...
Conference Paper
Integration of detrital zircon U-Pb geochronological analyses of modern rivers and ancient sedimentary basins in South America enables reconstruction of erosion and sediment routing patterns during uplift of the Andes. Provenance data for modern rivers in both erosional uplands and depositional basins define source-to-sink signatures for diverse se...
Article
Full-text available
Paleoaltimetry provides critical constraints on orogenic processes. Validation of paleoaltimeters enhances confidence in their application to geologic problems and requires investigations of proxy materials formed at known elevations over known time frames. We evaluated isotope-elevation relationships for late Pleistocene to Holocene (220–0 ka) hyd...
Data
Data Repository item 2019141 for: Jackson, L.J., Horton, B.K., Beate, B.O., Bright, J., and Breecker, D.O., 2019, Testing stable isotope paleoaltimetry with Quaternary volcanic glasses from the Ecuadorian Andes: Geology, v. 47, p. 411-414, doi:10.1130/G45861.1.
Article
Full-text available
The temporal proximity of the ~74 ka Toba supereruption to a putative 100–50 ka human population bottleneck is the basis for the volcanic winter/weak Garden of Eden hypothesis, which states that the eruption caused a 6-year-long global volcanic winter and reduced the effective population of anatomically modern humans (AMH) to fewer than 10,000 indi...
Conference Paper
Abstract: Stable hydrogen isotopic values (δD) of hydrated volcanic glasses from the ~211 ka Chalupas Ash Fall Tuff (AFT) deposit in Ecuador were measured to test the relationship between elevation and δD values of environmental waters in glass. Samples were collected over five distinct locations from the west coast to the Eastern Cordillera and ac...
Conference Paper
Full-text available
A late Cretaceous pre-accretional forearc basin: Río Playas Basin, South of Ecuador): Sedimentologic and provenance analyses for the Rio Playas Basin in southern Ecuador help to elucidate the late Cretaceous forearc evolution of southern Ecuador. Heavy mineral analyses and single grain geochemistry indicate that the volcanic basement of the basin i...
Article
Full-text available
The impact of the ca. 75 ka Mount Toba (Indonesia) supereruption on regional and global climate has been controversial. East Africa is pivotal for qualifying this impact, specifically in addressing a hypothesis that this eruption caused a volcanic winter leading to a genetic bottleneck in anatomically modern human populations. If the Toba eruption...

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