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Geology: Recent submissions
Now showing items 341-360 of 480
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Thermochronologic constraints on the late Cenozoic exhumation history of the Gurla Mandhata metamorphic core complex, Southwestern Tibet
(American Geophysical Union, 2014-02)How the Tibetan plateau is geodynamically linked to the Himalayas is a topic receiving considerable attention. The Karakoram fault plays key roles in describing the structural relationship between southern Tibet and the ... -
Miocene initiation and acceleration of extension in the South Lunggar rift, western Tibet: Evolution of an active detachment system from structural mapping and (U-Th)/He thermochronology
(American Geophysical Union, 2013-07-20)Ongoing extension in Tibet may have begun in the middle to late Miocene, but there are few robust estimates of the rates, timing, or magnitude of Neogene deformation within the Tibetan plateau. We present a comprehensive ... -
Evidence for constriction and Pliocene acceleration of east-west extension in the North Lunggar rift region of west central Tibet
(American Geophysical Union, 2013-10-10)The active north trending North Lunggar rift in west central southern Tibet exposes an extensional metamorphic core complex bounded by an east dipping low-angle normal fault. Apatite and zircon (U-Th)/He thermochronology ... -
High-resolution shear-wave reflection profiling to image offset in unconsolidated near-surface sediments
(University of Kansas, 2014-05-31)S-wave reflection profiling has many theoretical advantages, when compared to P-wave profiling, such as high-resolution potential, greater sensitivities to lithologic changes and insensitivity to the water table and pore ... -
Detrital U-Pb geochronology provenance analyses: case studies in the Greater Green River Basin, Wyoming, and the Book Cliffs, Utah
(University of Kansas, 2014-05-31)Heavy mineral modal abundances and U-Pb geochronology are used to determine sediment provenance, provenance changes through time, and timing of crustal exhumation. Optimal preparation of datable detrital minerals (zircon, ... -
Inorganic and organic carbon variations in surface water, Konza prairie LTER site, USA, and Maolan karst experimental site, China
(University of Kansas, 2014-05-31)Two natural groundwater-fed streams were selected to examine the diurnal trends of water geochemistry, CO2 emissions, and sources of OC on 25 May 2012 at the Konza Prairie Long-Term Ecological Research (LTER) site, USA and ... -
Reservoir Character of the Avalon Shale (Bone Spring Formation) of the Delaware Basin, West Texas and Southeast New Mexico: Effect of Carbonate-rich Sediment Gravity Flows
(University of Kansas, 2014-05-31)Sediment gravity flows (SGFs) can distribute large quantities of shelfal or slope carbonates into deeper basinal settings, forming complex heterogeneous deposits. Such deposits may have a negative or positive impact on ... -
Selectivity in the evolution of Palaeozoic arthropod groups, with focus on mass extinctions and radiations: a phylogenetic approach
(University of Kansas, 2014-05-31)Mass extinctions are known to be extraordinary events during which the normal rules of natural selection do not apply. Evidence points to the operation of a different selective regime, one where clade-level properties are ... -
Phylogenetic analyses of trilobites from the Cambrian and Ordovician radiations
(University of Kansas, 2014-05-31)Trilobites are an ideal group used for phylogenetic studies due to their complex morphology and abundance in the Paleozoic fossil record. Because of this, trilobite phylogenetics has become an important component of ... -
A horseshoe crab (Arthropoda: Chelicerata: Xiphosura) from the Lower Devonian (Lochkovian) of Yunnan, China
(Cambridge University Press, 2013-03)A single specimen of a new species of the synziphosurine Kasibelinurus Pickett, 1993 is described from the Lower Devonian (Lochkovian) Xiaxishancun Formation of Yunnan Province, China. The new species, K. yueya sp. nov., ... -
Fluvial Trace Fossils in the Middle Siwalik (Sarmatian-Pontian) of Darjeeling Himalayas, India
(Indian Academy of Sciences, 2013-08)Trace fossils that record animal and plant activity are described for the first time from the Middle Siwalik, Neogene deposits of Darjeeling Himalaya. Sedimentary facies association attests to a channel– interchannel ... -
A golden orb-weaver spider (Araneae: Nephilidae: Nephila) from the Middle Jurassic of China
(Royal Society Publishing, 2011-04-20)Nephila are large, conspicuous weavers of orb webs composed of golden silk, in tropical and subtropical regions. Nephilids have a sparse fossil record, the oldest described hitherto being Cretaraneus vilaltae from the ... -
Unraveling the Phylogenetic Relationships of the Eccoptochilinae, an Enigmatic Array of Ordovician Cheirurid Trilobites
(Public Library of Science, 2012-11-16)The Cheiruridae are a diverse group of trilobites and several subfamilies within the clade have been the focus of recent phylogenetic studies. This paper focuses on the relationships of one of those subfamilies, the ... -
The Late Cenozoic tectonic evolution of Gurla Mandhata, Southwest Tibet
(University of Kansas, 2012-12-31)How strain within the Tibetan plateau is geodynamically linked to that within the Himalayan thrust belt is a topic receiving considerable attention. The right-lateral Karakoram fault plays key roles in models describing ... -
Geochemical and Microbiological Characterization of the Arbuckle Saline Aquifer, a Potential CO2 Storage Reservoir; Implications for Hydraulic Separation and Caprock Integrity
(University of Kansas, 2012-12-31)Due to the mounting concern about climate change, geologic carbon storage (GCS) has become an attractive method of reducing atmospheric carbon. The United States has set ambitious goals for decreasing their CO2 emissions ... -
Depositional and paleoclimatic evolution of the Cenozoic High Plains succession from core: Haskell Co., Kansas
(University of Kansas, 2013-12-31)The Neogene Ogallala Formation and overlying, hydraulically connected Quaternary units form the High Plains Succession (HPS), includes one of the largest, most economically important, and agriculturally important freshwater ... -
Fluid Flow, Thermal History, and Diagenesis of the Cambrian-Ordovician Arbuckle Group and Overlying Units in South-Central Kansas
(University of Kansas, 2013-12-31)A diagenetic study of the Cambrian-Ordovician Arbuckle Group to the Middle Pennsylvanian Cherokee Group in south-central Kansas produced evidence of regional advective fluid flow and more localized fracture-controlled fluid ... -
Evaluating GPR polarization effects for imaging fracture channeling and estimating fracture properties
(University of Kansas, 2013-12-31)This study investigates the polarization properties of GPR signals for imaging flow channeling in a discrete fracture. In particular this study examines if cross-polarized components could be used to image channels in a ... -
Factors affecting the reactivity of granular iron in contact with chlorinated solvents
(University of Kansas, 2013-12-31)This study investigates, at various scales, the factors that affect the reactivity of granular iron (GI) toward chlorinated solvents and link these scale-specific processes with each other. The Kinetic Iron Model (KIM), ... -
Evolutionary Patterns of Trilobites Across the End Ordovician Mass Extinction
(University of Kansas, 2013-05-31)The end Ordovician mass extinction is the second largest extinction event in the history or life and it is classically interpreted as being caused by a sudden and unstable icehouse during otherwise greenhouse conditions. ...