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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Bear Lake (1)
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East Pacific Ocean Islands
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Guadalupe Island (1)
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Mexico
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Baja California Mexico (1)
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Baja California Sur Mexico (1)
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Oceania
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Micronesia
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Mariana Islands
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Northern Mariana Islands
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Saipan (1)
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Pacific Ocean
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East Pacific
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Northeast Pacific (1)
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North Pacific
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Northeast Pacific (1)
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San Nicolas Island (1)
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Santa Barbara Basin (1)
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Santa Cruz Island (1)
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United States
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California
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Channel Islands
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San Clemente Island (1)
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Los Angeles County California
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San Clemente Island (1)
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Santa Barbara County California
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Idaho (1)
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Utah
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strontium
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oxygen
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fossils
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diatoms (1)
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geochronology methods
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geologic age
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upper Quaternary (3)
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minerals
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carbonates (1)
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Primary terms
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absolute age (3)
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biogeography (1)
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carbon
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C-13/C-12 (1)
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C-14 (1)
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organic carbon (1)
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Cenozoic
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Quaternary
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upper Quaternary (3)
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deformation (1)
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earthquakes (1)
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East Pacific Ocean Islands
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Guadalupe Island (1)
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faults (1)
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Invertebrata
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Arthropoda
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Mandibulata
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Crustacea
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Ostracoda (1)
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Cnidaria
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Anthozoa (3)
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Mollusca
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Bivalvia (1)
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Gastropoda (1)
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Protista
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Foraminifera
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Rotaliina
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Globigerinacea
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Neogloboquadrina
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Neogloboquadrina pachyderma (1)
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isotopes
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radioactive isotopes
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C-14 (1)
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stable isotopes
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C-13/C-12 (1)
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O-18/O-16 (1)
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Sr-87/Sr-86 (1)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (1)
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Mexico
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Baja California Mexico (1)
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Baja California Sur Mexico (1)
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Ocean Drilling Program
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Leg 167
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ODP Site 1012 (1)
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ODP Site 1017 (1)
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ODP Site 1018 (1)
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ODP Site 1019 (1)
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ODP Site 1020 (1)
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Oceania
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Micronesia
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Mariana Islands
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Northern Mariana Islands
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Saipan (1)
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oxygen
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O-18/O-16 (1)
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Pacific Ocean
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East Pacific
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Northeast Pacific (1)
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North Pacific
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Northeast Pacific (1)
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paleoclimatology (1)
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paleoecology (2)
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palynomorphs
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miospores
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pollen (1)
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petrology (1)
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Plantae
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algae
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diatoms (1)
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plate tectonics (1)
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sea-level changes (2)
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sedimentary rocks
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carbonate rocks
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limestone (1)
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sediments (1)
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tectonics (2)
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United States
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California
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Channel Islands
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San Clemente Island (1)
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Los Angeles County California
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San Clemente Island (1)
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Santa Barbara County California
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Point Conception (1)
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Idaho (1)
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Utah
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Great Salt Lake (1)
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sedimentary rocks
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sedimentary rocks
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carbonate rocks
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limestone (1)
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sediments
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sediments (1)
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Late Quaternary sea-level history of Saipan, Commonwealth of the Northern Mariana Islands, USA: A test of tectonic uplift and glacial isostatic adjustment models
A continuous, 120-m-long core (BL00-1) from Bear Lake, Utah and Idaho, contains evidence of hydrologic and environmental change over the last two glacial-interglacial cycles. The core was taken at 41.95°N, 111.31°W, near the depocenter of the 60-m-deep, spring-fed, alkaline lake, where carbonate-bearing sediment has accumulated continuously. Chronological control is poor but indicates an average sedimentation rate of 0.54 mm yr ‒1 . Analyses have been completed at multi-centennial to millennial scales, including (in order of decreasing temporal resolution) sediment magnetic properties, oxygen and carbon isotopes on bulk-sediment carbonate, organic- and inorganic- carbon contents, palynology; mineralogy (X-ray diffraction), strontium isotopes on bulk carbonate, ostracode taxonomy, oxygen and carbon isotopes on ostracodes, and diatom assemblages. Massive silty clay and marl constitute most of the core, with variable carbonate content (average = 31 ± 19%) and oxygen-isotopic values (δ 18 O ranging from ‒18‰ to ‒5‰ in bulk carbonate). These variations, as well as fluctuations of biological indicators, reflect changes in the water and sediment discharged from the glaciated headwaters of the dominant tributary, Bear River, and the processes that influenced sediment delivery to the core site, including lake-level changes. Although its influence has varied, Bear River has remained a tributary to Bear Lake during most of the last quarter-million years. The lake disconnected from the river and, except for a few brief excursions, retracted into a topographically closed basin during global interglaciations (during parts of marine isotope stages 7, 5, and 1). These intervals contain up to 80% endogenic aragonite with high δ 18 O values (average = ‒5.8 ± 1.7‰), indicative of strongly evaporitic conditions. Interglacial intervals also are dominated by small, benthic/tychoplanktic fragilarioid species indicative of reduced habitat availability associated with low lake levels, and they contain increased high-desert shrub and Juniperus pollen and decreased forest and forest-woodland pollen. The 87 Sr/ 86 Sr values (>0.7100) also increase, and the ratio of quartz to dolomite decreases, as expected in the absence of Bear River inflow. The changing paleoenvironments inferred from BL00-1 generally are consistent with other regional and global records of glacial-interglacial fluctuations; the diversity of paleoenvironmental conditions inferred from BL00-1 also reflects the influence of catchment-scale processes.