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Origin of large-scale sandstone intrusions : insights from subsurface case studies and numerical modellingSzarawarska, Ewa January 2009 (has links)
This thesis investigates the origin of large-scale sandstone intrusions. A new approach combining seismic, well data, core and outcrop observations with numerical modelling has been undertaken. Two possible end members of saucer-shaped, seismic-scale sandstone intrusions from the North Sea were identified on the basis of seismic data and core observation. Diagnostic criteria were proposed to differentiate between fully and only partially injected sand bodies. Outcrop and core data presented in this thesis provide a direct example and analogue for seismic and sub-seismic scale sandstone intrusions, highlighting the brittle nature of the host rock deformation at all levels within the examined intrusion complexes. On this basis, the rheological behaviour of the host strata at the time of sand injection is inferred to be elastic with brittle fracturing. This outcome is used as an input condition for Finite Difference and Finite Element modelling that aim to test hypotheses describing triggering mechanisms and estimate their regional extent, depth and overpressures present during sand injection. The results of numerical modelling indicate that formation of the North Sea sandstone intrusions could potentially be triggered by catastrophic event(s) such as a meteorite impact or earthquakes, leading to sand liquefaction and remobilization. It has also been shown that depths at which sand injection can take place reach 1 km. Only supra-lithostatic pressures generate bodies composed of lower, bedding concordant part of intruded or depositional origin feeding inclined dykes at its marginal parts resembling those observed today on seismic data from the North Sea and in outcrops.
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Minéralisations et circulations péri-granitiques modélisation numérique couplée 2D/3D, applications au district minier de Tighza (Maroc-Central) /Eldursi, Khalifa Marcoux, Eric. Guillou-Frottier, Laurent January 2009 (has links) (PDF)
Thèse de doctorat : Sciences de la Terre et de l'atmosphère : Orléans : 2009. / Titre provenant de l'écran-titre.
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The geology and tectonics of the Idaho porphyry belt from the Boise Basin to the Casto QuadrangleOlson, Harry J., 1931- January 1968 (has links)
No description available.
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The spuzzum pluton Northwest of Hope, B.C.Vining, Mark Richard January 1977 (has links)
The Spuzzum Batholith underlies an area northwest of Hope, B.C. It is nearly 60 km. long in a northerly direction and 10 to 20 km. across. The southern part of the body is zoned from pyroxene diorite in its core, through hornblende diorite, to biotite-hornblende tonalite. Tonalite forms about two thirds of the pluton's area, forming a nearly continuous rim. The pluton intrudes upper Paleozic Chilliwack Group, the Cretaceous (?) Giant Mascot Ultramafic Body, and Settler Schist of unknown age. K-Ar ages for tonalite and diorite range from 76 to 103 m.y.
Diorite consists of subhedral orthopyroxene and plagioclase (An₆₂ to An⁴¹), with variable amounts of hornblende and clinopyroxene. Tonalite is largely composed of anhedral quartz and biotite, and subhedral hornblende and plagioclase (An⁵⁰ to An₃₂). Tonalite and some diorites are foliated. These rocks are locally hornblendized, resembling hornblende gabbro. Pods of directionless hornblendite are common in hornblendized rocks.
Foliations and mineralogical zonation outline a crude tongue-like structure, modified by later deformation. Spuzzum diorite appears to have intruded the main part of the Giant Mascot Ultramafic Body but some hornblendites are younger than diorite.
The Giant Mascot Ultramafic Body, 2 by 3 km., is zoned from dunite or peridotite, through pyroxenite, to a rim of hornblendite up to 100 m. across. Hornblendite occurs also as dykes.
Orthopyroxenes of Spuzzum diorite are weakly aluminous hypersthene; those of the contact with Giant Mascot pyroxenite are bronzite. Clinopyroxenes of the same rocks are somewhat more aluminous salites and diopsides. Hornblendites from Spuzzum diorite and the Giant Mascot Ultramafic Body resemble alkali basalt in composition. Hornblende analyses fall into three categories: edenite, pargasite-common hornblende, and thirdly, more iron-rich common hornblende.
It is concluded that Spuzzum diorite and tonalite originated by crystal settling from quartz diorite magma at depth, followed by diapiric rise of a zoned pluton composed of residual tonalite liquid cored by drawn-up dioritic cumulate. A mathematical test shows the compositions of diorite and tonalite to be consistent with this hypothesis. The rising pluton subsequently engulfed the Giant Mascot Ultramafic Body. Hornblendites may have formed by metasomatism of these rocks and adjacent diorite or tonalite as a consequence of the second boiling of tonalite and the coursing of resultant hydrothermal fluid through the nearly solid pluton. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate
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Thanks for Stopping By! An Examination of the Costs and Benefits of Workplace IntrusionsJanuary 2020 (has links)
abstract: Workplace intrusions—unexpected encounters initiated by another person that disrupt an individual’s work—are generally characterized as negative experiences that deplete resources, increase role and information overload, and promote strain. My research challenges this consensus by arguing that intrusions may also provide benefits to the employees who are intruded upon. Specifically, I investigate how intrusions impact the extent to which employees engage in their own work—engagement—and the extent to which they engage with others at work—collaboration. I also investigate the indirect effects of different types of intrusions on employees’ task-focused and person-focused citizenship through these mechanisms. I tested my predictions utilizing experience sampling methodology (Study 1), a within-person experimental critical incident study (Study 2), and an experiment (Study 3). My research investigates the dynamics of various types of workplace intrusions, with results suggesting that intrusions may lead to beneficial employee outcomes in addition to the adverse outcomes previously demonstrated in the literature. Given the ubiquitous nature of intrusions in organizations, these findings have both theoretical and practical significance. / Dissertation/Thesis / Doctoral Dissertation Business Administration 2020
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The partition of trace elements among coexisting minerals in some Laramide intrusive rocks in ArizonaGraybeal, Frederick Turner, 1938- January 1972 (has links)
No description available.
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Approche expérimentale de la cristallisation dans les chambres magmatiques et étude d'intrusions litées (massif gabbroïque du Skaergaard, Groenland et pluton granitique de Dolbel, Niger)Pupier, Elsa Barbey, Pierre. January 2006 (has links) (PDF)
Thèse doctorat : Sciences de la Terre et de l'Univers : Nancy 1 : 2006. / Titre provenant de l'écran-titre.
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Thermal histories of small intrusions from petrologic information.Gray, Norman Henry. January 1970 (has links)
No description available.
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The petrology and geochemistry of granitic rocks from the Entia domal structure, Harts Range, eastern Arunta Block, Central Australia /Buick, Ian S. January 1985 (has links) (PDF)
Thesis (M. Sc.)--University of Adelaide, Dept of Geology and Geophysics, 1986. / 1 map in pocket. Includes bibliographical references (leaves 150-160).
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Petrology of the plutonic rocks of the Macquarie Island Complex /Christodoulou, C January 1990 (has links) (PDF)
Thesis (Ph. D.)--University of Adelaide, Dept. of Geology and Geophysics, 1992. / Maps on 2 folded leaves in pocket. Includes bibliographical references (25 leaves ).
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