A5062447455- Geomagnetism and Paleomagnetism Studies
- Geology and Paleoclimatology Research
- Geological and Geochemical Analysis
- Geological formations and processes
- Geophysical and Geoelectrical Methods
- Paleontology and Stratigraphy of Fossils
- Geological and Geophysical Studies
- Pleistocene-Era Hominins and Archaeology
- Geochemistry and Geologic Mapping
- Geological and Geophysical Studies Worldwide
- earthquake and tectonic studies
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Geophysics and Gravity Measurements
- Maritime and Coastal Archaeology
- Archaeological and Geological Studies
- Earthquake and Disaster Impact Studies
- Cryospheric studies and observations
- Magnetic and Electromagnetic Effects
- Methane Hydrates and Related Phenomena
- Image Processing and 3D Reconstruction
- Geochemistry and Elemental Analysis
- Geological Formations and Processes Exploration
- Seismic Imaging and Inversion Techniques
- Geological and Tectonic Studies in Latin America
Lehigh University
2015-2024
Utrecht University
2004
Kōchi University
1992
Purdue University West Lafayette
1992
Stanford University
1978
We present a highly sensitive and accurate method for quantitative detection characterization of noninteracting or weakly interacting uniaxial single domain particles (UNISD) in rocks sediments. The is based on high‐resolution measurements first‐order reversal curves (FORCs). UNISD have unique FORC signature that can be used to isolate their contribution among other magnetic components. This has narrow ridge along the H c axis diagram, called central ridge, which proportional switching field...
A synthetic sediment comprised of kaolinite, distilled water and either equidimensional or acicular magnetite was given a post-depositional remanent magnetization (PDRM) by being stirred in magnetic field. This compacted under pressures which varied continuously from 0 to 0.14 MPa water-tank consolidometer higher pressure steps (<2.53 MPa) standard soil consolidometer. Compaction took place the same field sample its PDRM. The compaction caused shallowing sample's inclination. found be...
Anomalously shallow paleomagnetic inclinations from Tarim basin red beds have suggested more than 1000 km of northward translation the block since Cretaceous. This is in conflict with geologic observations that indicate only a few hundred kilometers crustal shortening north basin. To determine whether rock magnetic effect could be cause inclinations, samples were collected Cretaceous Kapusaliang Group beds. Both thermal and chemical demagnetization employed to isolate characteristic...
Experiments using single‐clay slurries consisting of acicular or equidimensional magnetite mixed with either kaolinite, illite, montmorillonite, chlorite were conducted to determine the effect compaction on inclination. A natural marine sediment and a “reconstructed” sediment, made up clays used in our experiments, also studied. laboratory postdepositional remanence, imparted by stirring, had its inclination shallowed for both samples, as seen previously (Anson Kodama, 1987), reconstructed...
Abstract Paleomagnetism can elucidate the origin of inner core structure by establishing when crystallization started. The salient signal is an ultralow field strength, associated with waning thermal energy to power geodynamo from core-mantle heat flux, followed a sharp intensity increase as new and compositional sources buoyancy become available once nucleation (ICN) commences. Ultralow fields have been reported Ediacaran (~565 Ma) rocks, but transition stronger strengths has unclear....
Abstract Earth’s magnetic field was in a highly unusual state when macroscopic animals of the Ediacara Fauna diversified and thrived. Any connection between these events is tantalizing but unclear. Here, we present single crystal paleointensity data from 2054 591 Ma pyroxenites gabbros that define dramatic intensity decline, strong Proterozoic like today, to an Ediacaran value 30 times weaker. The latter weakest time-averaged known date together with other robust estimates indicate ultra-low...
Numerical modeling was conducted to determine the effects of simple models folding strain on prefolding Fisherian distributions magnetization. I found that constant volume, shear associated with flexural slip/flexural flow can rotate a magnetization have maximum precision parameter K value at partial unfolding and thus appear be synfolding in age. If is treated as passive line marker, this behavior only occurs for steep initial magnetizations. The homogeneity parameters from each limb...
Research Article| March 01, 2014 Unraveling tectonic and climatic controls on synorogenic growth strata (Northern Apennines, Italy) Kellen L. Gunderson; Gunderson 1Lehigh University, Department of Earth Environmental Sciences, 1 W. Packer Ave., Bethlehem, Pennsylvania 18015, USA †Current address: Chevron Energy Technology Company, 1500 Louisiana St., Houston, Texas 77002, USA; kgunderson@chevron.com. Search for other works by this author on: GSW Google Scholar Frank J. Pazzaglia; Pazzaglia...
The accuracy of an inclination shallowing correction technique was tested on the remanence Paleocene Nacimiento Formation. assumes that changes in paleomagnetic during deformation will be directly related to anisotropy. anisotropy is also a function magnetic individual grains. Formation selected for this test because its shallow by 7° 8° and previous studies indicate it has primary with well‐constrained age overprints are minimal. Tectonics unlikely explanation inclination. These conditions...
A paleomagnetic and rock magnetic study of the Carboniferous Deer Lake Group red beds Newfoundland was performed to detect correct for inclination shallowing. Results indicate a primary remanence carried by magnetite, with mean direction D= 179.7°, I= 33.7°, α95= 7.2° which corresponds paleopole position 22.2°N, 122.3°E, A95= 7.6°. Correcting using anisotropy anhysteretic measured individual particle gives corrected 178.8°, 50.9°, 6.3° corresponding at 8.4°N, 122.7°E, 7.2°. This correction...
A rock magnetic cyclostratigraphy, based on anhysteretic remanent magnetization (ARM) intensity variations, was developed for the Eocene Arguis Formation in Spanish Pyrenees. The sampled ARM magnetic, and paleomagnetic analyses. Rock measurements indicate that dominant mineral controlling cyclostratigraphy is depositional magnetite. Using thermal demagnetization, a detailed magnetostratigraphy to provide an absolute time framework cyclostratigraphy. carried by combination of magnetite...
Research Article| June 01, 2017 Rock magnetic chronostratigraphy of the Shuram carbon isotope excursion: Wonoka Formation, Australia D. Minguez; Minguez Department Earth and Environmental Science, Lehigh University, 1 W. Packer Avenue, Bethlehem, Pennsylvania 18015, USA Search for other works by this author on: GSW Google Scholar K.P. Kodama Author Article Information Publisher: Geological Society America Received: 03 Sep 2016 Revision 02 Mar Accepted: First Online: 28 Jun Online Issn:...
Red, hematite‐bearing sedimentary rocks are an important source of paleomagnetic data, particularly for continental apparent polar wander paths during the Paleozoic. This study presents magnetic anisotropy data from Mississippian Mauch Chunk Formation eastern Pennsylvania, indicating that these red beds have suffered a significant amount inclination shallowing. Fourteen oriented block samples were collected normal and reversed polarity strata identified in previous study. Thermal...
Anisotropy of anhysteretic remanence (AAR), scanning electron microscopy (SEM), and X ray pole figure goniometry studies clay‐rich sediments were conducted to delineate the interactions between magnetite clay particles which cause inclination shallowing during compaction. These used synthetic composed kaolinite or illite two grain sizes magnetite, 0.45 μm 2–3 μm. Natural marine contained 40–50% also used. The compacted by pressures as high 0.157 MPa. sediments' porosity decrease suggests...