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Showing 1 to 20 of 40 for “"paleomagnetism"”.
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Paleomagnetism of Lonar impact glass
Several dozen impact glasses from Lonar Crater, in Maharashtra, India, were analyzed for evidence of impact-generated paleofields, and possible motional remanent magnetization. Lonar Crater formed when a meteorite impacted a bed of Deccan Trap basalts. Upon impact, the basalt was super heated into …
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Constraining Planetary Science Problems with Micro-Paleomagnetism
… In this thesis I used the techniques from micro-paleomagnetism to address two main problems: (1) when Earth’s magnetic field started and (2) how did the magnetic field in the solar nebula varied in space and time. For the first, I conducted paleomagnetic measurements with the Jack Hills zircon …
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Paleomagnetism conglomerate test on Archean conglomerate rock from Jack Hills, Australia
A paleomagnetism study known as a conglomerate test was run on an Archean sandstone conglomerate rock to determine if the sample contained a remnant magnetization from the time of its formation. Twenty-nine clasts from a thin section of the sample were thermally demagnetized up to a temperature of …
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Neogene paleomagnetism and geodynamics of the Hikurangi margin, East Coast, New Zealand
Vertical-axis rotations are an important component of Neogene deformation in the New Zealand plate boundary region, and potentially offer fundamental insights into the rheology of continental crust. Extensive paleomagnetic sampling along the Hikurangi margin, on the East Coast of the North Island, …
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Paleomagnetism of Late Triassic and Jurassic sediments of the southwestern United States.
Paleomagnetic poles were obtained from the Chinle, Kayenta, Summerville, and Morrison Formations. Combined with paleomagnetic poles from the Moenave Formation, poles from the Chinle and Kayenta formations record ∼30 m.y. of North American apparent polar wander (APW) within a regional stratigraphic …
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Extension in high-grade terranes of the southern Omineca belt : evidence from paleomagnetism
Previous paleomagnetic studies have shown that significant tilts have occurred in plutonic and high-grade metamorphic terranes within the zone of Eocene extension in the southern Omineca Belt (Bardoux and Irving 1989; Marquis and Irving 1990). The previous extent of sampling in the area (34 sites) …
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Paleomagnetism and rock magnetism of Powder River basin clinker, northeastern Wyoming and southeastern Montana
Includes bibliographical references.
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I. Paleomagnetism and crustal rotations along a shear zone, Las Vegas range, Southern Nevada ; II. Seismotectonics of the Tien Shan, Central Asia
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1988.
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Paleomagnetic and AMS results from Oligocene ash-flow tuffs of the eastern San Juan Mountains : implications for the evolution of the western margin of the San Luis Basin, northern Rio Grande Rift
… history of the northern Rio Grande rift using paleomagnetism. Outflow deposits of ash-flow tuffs are generally excellent recorders of the geomagnetic field and can be used to study the vertical-axis rotation component of extension related to the opening of the SLB. Four ash-flow tuffs …
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The origin and tectonic history of the Southwest Philippine Sea
… seafloor magnetic anomalies, bathymetry, and the paleomagnetism of DSDP sediments and basalt in the West Philippine Basin, in an attempt to resolve questions about its origin as a marginal basin. Our results suggest that this basin was formed in an Eocene pulse of rapid spreading (v1/2 = 41-44 …
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A paleomagnetic study of the angrite Sahara 99555
… SAH 99555 to discover if it contains a primary paleomagnetism and then to determine a paleointensity estimate and its ferromagnetic mineralogy. Our studies show that the primary ferromagnetic mineral in SAH 99555 is magnetite and there are also some accessory ferromagnetic minerals including …
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Paleomagnetic Constraints on Assembly of the Superior Craton: Results from the 2.72-2.69 Ga Vermilion District of the Wawa Subprovince, MN
Paleomagnetism can reveal ancient tectonic motions and identify the processes that regionally overprint magnetizations. We present paleomagnetic data from greenstones in the 2.72-2.69 Ga Vermillion Belt, Superior Craton, Minnesota. The Vermillion Belt has experienced lower greenschist facies …
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Tectonics and kinematics of curved mountain belts: examples from the Andes and the Alps
… factors controlling the shape of orogenic bends? Paleomagnetism demonstrated to be one of the most effective techniques in order to document the deformation of a curved belt through the determination of vertical axis rotations. In fact, the pattern of rotations within a curved belt can reveal the …
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Paleomagnetic and Rock Magnetic Analysis of Upper Cretaceous Synorogenic Conglomerates From the Cordilleran Foreland Basin, Utah; Middle Triassic Moenkopi Formation From the Petrified Forest National Park, Arizona; and Pseudotachylytes From the Albany-Fraser Orogenic Belt, Southwest Australia
… projects that focus on the application of paleomagnetism and rock-magnetism to decipher the magnetic mineralogy and magnetic remanence carrier, magnetization acquisition processes, magnetic petrofabric to understand the depositional and post-depositional deformation fabrics, and to …
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Holocene sedimentary history of Chilliwack Valley, Northern Cascade Mountains
… are estimated using sediment cores and paleomagnetism. These are compared with accumulation rates in the terminal fan inferred from radiocarbon dating of fossil material, obtained by sonic drilling in the apex gravels. A sediment budget framework is then used to summarize the net …
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