A5061231767- Geology and Paleoclimatology Research
- Geological formations and processes
- Geological and Geophysical Studies
- Geological and Tectonic Studies in Latin America
- earthquake and tectonic studies
- Cryospheric studies and observations
- Methane Hydrates and Related Phenomena
- Hydrology and Sediment Transport Processes
- Fish Ecology and Management Studies
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Geochemistry and Geologic Mapping
- Reservoir Engineering and Simulation Methods
- Seismic Imaging and Inversion Techniques
- Geological and Geophysical Studies Worldwide
- Geophysical Methods and Applications
- Landslides and related hazards
- Seismic Waves and Analysis
- Pleistocene-Era Hominins and Archaeology
- Heavy metals in environment
- Hydrology and Watershed Management Studies
- Pacific and Southeast Asian Studies
- Climate change and permafrost
- Marine and environmental studies
- Groundwater and Isotope Geochemistry
University of Minnesota, Duluth
2011-2023
University of Minnesota
1984-2014
Significance Climate variability in the tropical western Pacific exerts enormous influence on global climate, yet its history remains poorly constrained. We present region’s first continuous terrestrial sedimentary record of surface hydrology and vegetation spanning last 60,000 y based upon geochemical data from Lake Towuti, Indonesia. Our demonstrate that wet conditions rainforest ecosystems during Holocene marine isotope stage 3 were interrupted by severe drying between ∼33,000 16,000...
Abstract. The Towuti Drilling Project (TDP) is an international research program, whose goal to understand long-term environmental and climatic change in the tropical western Pacific, impacts of geological changes on biological evolution aquatic taxa, geomicrobiology biogeochemistry metal-rich, ultramafic-hosted lake sediments through scientific drilling Lake Towuti, southern Sulawesi, Indonesia. a large tectonic at downstream end Malili system, chain five highly biodiverse lakes that are...
Abstract Our understanding of the climatic teleconnections that drove ice-age cycles has been limited by a paucity well-dated tropical records glaciation span several glacial–interglacial intervals. Glacial deposits offer discrete snapshots glacier extent but cannot provide continuous required for detailed interhemispheric comparisons. By contrast, lakes located within glaciated catchments can archives upstream glacial activity, few such extend beyond last cycle. Here piston core from Lake...
Research Article| July 01, 2008 Large subglacial lake beneath the Laurentide Ice Sheet inferred from sedimentary sequences Poul Christoffersen; Christoffersen 1Scott Polar Institute, University of Cambridge, Cambridge CB2 1ER, UK Search for other works by this author on: GSW Google Scholar Slawek Tulaczyk; Tulaczyk 2Earth and Planetary Sciences Department, California–Santa Cruz, Santa California 95064, USA Nigel J. Wattrus; Wattrus 3Large Lakes Observatory Department Geological Sciences,...
Abstract Glacial varves can detail ice-margin positions and provide a proxy for meltwater discharge at resolutions comparable to those of the Greenland ice core archives, thus they be critical paleorecords assessing response both ancient modern sheets climate change. Here we an ∼1500 yr varve chronology straddling Younger Dryas (YD)–Holocene boundary (11.65 cal. kyr B.P.), first such in North America. The are from glacial Lake Agassiz (central America). is pinned on accelerator mass...
The behavior of glaciers terminating in deep water is determined by the interaction buoyancy, iceberg production, and sensitivity ice flow to subtle changes resistance at glacier bed. Modeling efforts assume rapid evacuation icebergs, but some terminate closed basins where icebergs may accumulate. Multibeam bathymetric survey a glacial lake Iceland that received outlet during Little Ice Age document near parallel narrow, fingers extended up 1 km beyond grounding line. These previously unseen...
Abstract. The primary scientific objective of MexiDrill, the Basin Mexico Drilling Program, is development a continuous, high-resolution ∼400 kyr lacustrine record tropical North American environmental change. field location, in densely populated, water-stressed City region gives this particular societal relevance. A detailed paleoclimate reconstruction from central will enhance our understanding long-term natural climate variability tropics and its relationship with changes at higher...
Abstract Seismic-reflection surveys of the Isle Royale sub-basin, central Lake Superior, reveal two large end moraines and associated glacial sediments deposited during last cycle Laurentide Ice Sheet in basin. The directly overlie bedrock are cored with dense, acoustically massive till intercalated down-ice stratified outwash. Till outwash overlain by varves, a lower red unit an upper gray unit. maximum extent late Younger Dryas-age readvance into western Superior basin is uncertain, but it...
Abstract Geologic records of past earthquakes are rare but critical for identifying long‐term patterns in fault behavior and assessing modern earthquake hazards. We present a continuous 14,000‐year paleoearthquake reconstruction using precisely dated lacustrine sediments landslide deposits from lake basin positioned directly on the Teton normal fault, which cuts across Grand National Park, WY, is among most hazardous intraplate faults western United States. show that beginning immediately...
Research Article| March 01, 2004 Recognition of an early Holocene polygonal fault system in Lake Superior: Implications for the compaction fine-grained sediments Joseph Cartwright; Cartwright 13D LAB, School Earth Sciences, P.O. Box 914, Cardiff University, CF10 3YE, UK Search other works by this author on: GSW Google Scholar Nigel Wattrus; Wattrus 2Large Lakes Observatory, University Minnesota, Duluth, Minnesota 55812, USA Deborah Rausch; Rausch 3 3D Alastair Bolton Geology (2004) 32 (3):...
Abstract Lake trout Salvelinus namaycush , lake whitefish Coregonus clupeaformis and cisco artedi are salmonid fishes native to the Laurentian Great Lakes that spawn on rocky substrates in fall early winter. After comparing locations of spawning habitat for these species main basin Huron with surficial hypothesized fast‐flowing Late Wisconsinan paleo‐ice streams, we hypothesize much is result deposition erosion by streams. This hypothesis may represent a new framework identification...
Located at the triple junction of Pacific, Eurasian and Sunda plates, Island Sulawesi in Indonesia is one most tectonically active places on Earth. This highlighted by recurrence devastating earthquakes such as 2018 Mw 7.5 earthquake that damaged city Palu caused several thousand fatalities central Sulawesi. The majority large-magnitude are related to stress release along major strike-slip faults Palu-Koro Fault its southern extensions, Matano Lawanopo Faults. To date, information frequency...
Abstract New multi-beam sonar and seismic data collected in Lake Superior document the wide-spread development of lake-floor rings fine-grained sediments. The images reveal that develop as connected clusters individual have an irregular polygonal appearance. High-resolution with a 28 kHz echo sounder extensive fracturing faulting glacio-lacustrine sediments below lake-floor. Displacement on faults is typically normal throws less than 50 cm. Three styles are recognized: (a) monoclinal...
The left-lateral Enriquillo-Plantain Garden Fault (EPGF) is one of two transform systems that define the Northern Caribbean plate boundary zone. Relative motion across its trace (~ 10 mm/yr) evolves from nearly pure strike-slip in western Haiti to transpressional eastern Haiti, where fault system may terminate against a south-dipping oblique reverse fault. Lake Azuei large (10 km x 25 km) and shallow (< 30 m deep) lake lies direct extension EPGF Haiti. A single core previously collected...
More than 100 km of seismic reflection profiles together with a new multibeam survey the sediment fill in lake Hestvatn, South Iceland, reveal two sub-basins filled up to 44 m deglacial and Holocene sediment.The chronology is constrained by geochemically characterized tephra layers radiocarbon dates on marine molluscs.The Vedde Ash Saksunarvatn provide key chronological control for sediment.Five units are tied lithostratigraphy cores obtained from basins.The major changes glacial,...