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Application of Magnetic and Structural Techniques to Continental Tectonics and Air Pollution.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Application of Magnetic and Structural Techniques to Continental Tectonics and Air Pollution./
Author:	Rea-Downing, Grant.
Description:	1 online resource (449 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 84-05, Section: B.
Contained By:	Dissertations Abstracts International84-05B.
Subject:	Geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29062046click for full text (PQDT)
ISBN:	9798357573261

Application of Magnetic and Structural Techniques to Continental Tectonics and Air Pollution.
Rea-Downing, Grant.

Application of Magnetic and Structural Techniques to Continental Tectonics and Air Pollution. - 1 online resource (449 pages)

Source: Dissertations Abstracts International, Volume: 84-05, Section: B.

Thesis (Ph.D.)--The University of Utah, 2022.

Includes bibliographical references

We leverage concentration dependent magnetic measurements to understand the temporal and spatial distribution of airborne particulate matter in Salt Lake City during periods of enhanced poor air quality. Results indicate a high degree of variability in the distribution of particulate matter before, during, and after such events. Chemical analysis of evergreen needles suggests high concentrations of particulate matter near busy roadways. Furthermore, concentrations of dangerous elements including lead correlate with sample magnetization suggesting that low-cost magnetic measurements act as a proxy for toxic element concentrations.We combine structural, geochemical, and geochronologic analysis to the southwest Langshan of central China to evaluate the geologic history of the region. The high silica granite found in the field area marks the collision of the Alxa block and the North China Craton. Late Jurassic thrusting accommodated NW-SE shortening associated with the Mongol-Okhotsk Ocean closure followed by Cretaceous metamorphic core complex development. Surface uplift and tilting/folding in the Late Cretaceous resulted in erosion and an angular unconformity followed by strike-slip faulting associated with the India-Eurasia collision. Finally, normal faulting driven by far-field stress from India-Eurasia convergence exposed the field area in the footwall of a range-front fault.We employ a new statistical approach to paleomagnetic data from Central Asia to evaluate the timing of the Mongol-Okhotsk Ocean basin closure. Our technique better constrains the age of the Mesozoic collision by providing a detailed understanding the of underlying paleomagnetic data. It also highlights substantial disagreements between volcanic and sedimentary data. Our results suggest that the collision occurred before the Middle Jurassic, timing that is earlier than previous paleomagnetic studies implied and in better agreement with existing geologic interpretations. Our analysis represents a new, improved paleomagnetic workflow that can be exported to the entire paleogeographic community.We evaluate drone-derived 3D models as an alternative approach to determining structural tilt corrections for gently dipping paleomagnetic sites. Our results show that such models provide accurate structural data required for tilt corrections where traditional methods fail. Additionally, the technique provides detailed paleotopographic information that is nearly impossible to acquire otherwise. We outline our workflow as well as a list of important considerations for applying drone-based techniques to paleomagnetic analysis.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798357573261Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

Continental tectonicsIndex Terms--Genre/Form:

542853
Electronic books.

Application of Magnetic and Structural Techniques to Continental Tectonics and Air Pollution.
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500 $a Source: Dissertations Abstracts International, Volume: 84-05, Section: B.
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504 $a Includes bibliographical references
520 $a We leverage concentration dependent magnetic measurements to understand the temporal and spatial distribution of airborne particulate matter in Salt Lake City during periods of enhanced poor air quality. Results indicate a high degree of variability in the distribution of particulate matter before, during, and after such events. Chemical analysis of evergreen needles suggests high concentrations of particulate matter near busy roadways. Furthermore, concentrations of dangerous elements including lead correlate with sample magnetization suggesting that low-cost magnetic measurements act as a proxy for toxic element concentrations.We combine structural, geochemical, and geochronologic analysis to the southwest Langshan of central China to evaluate the geologic history of the region. The high silica granite found in the field area marks the collision of the Alxa block and the North China Craton. Late Jurassic thrusting accommodated NW-SE shortening associated with the Mongol-Okhotsk Ocean closure followed by Cretaceous metamorphic core complex development. Surface uplift and tilting/folding in the Late Cretaceous resulted in erosion and an angular unconformity followed by strike-slip faulting associated with the India-Eurasia collision. Finally, normal faulting driven by far-field stress from India-Eurasia convergence exposed the field area in the footwall of a range-front fault.We employ a new statistical approach to paleomagnetic data from Central Asia to evaluate the timing of the Mongol-Okhotsk Ocean basin closure. Our technique better constrains the age of the Mesozoic collision by providing a detailed understanding the of underlying paleomagnetic data. It also highlights substantial disagreements between volcanic and sedimentary data. Our results suggest that the collision occurred before the Middle Jurassic, timing that is earlier than previous paleomagnetic studies implied and in better agreement with existing geologic interpretations. Our analysis represents a new, improved paleomagnetic workflow that can be exported to the entire paleogeographic community.We evaluate drone-derived 3D models as an alternative approach to determining structural tilt corrections for gently dipping paleomagnetic sites. Our results show that such models provide accurate structural data required for tilt corrections where traditional methods fail. Additionally, the technique provides detailed paleotopographic information that is nearly impossible to acquire otherwise. We outline our workflow as well as a list of important considerations for applying drone-based techniques to paleomagnetic analysis.
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538 $a Mode of access: World Wide Web
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650 4 $a Geophysics. $3 535228
650 4 $a Environmental health. $3 543032
650 4 $a Plate tectonics. $3 542702
650 4 $a Atmospheric sciences. $3 3168354
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653 $a Air pollution
653 $a Paleomagnetic data
653 $a Paleogeography
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