sgr ms thesis - University of Maine

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likely explosive mechanism of breccia formation followed by modification of metasedimentary clast shapes and sizes through partial melting and postbrecciation thermal fracturing. Methods from this thesis provide a new approach for the fractal analysis of breccias formed in a magmatic environment. 3
Chapter 2 GEOLOGIC SETTING 2.1. Regional Geology: The Coastal Maine Magmatic Province The area of interest lies in the Coastal Maine Magmatic Province (Hogan and Sinha, 1989), a group of over 100 plutons of granitic through gabbroic composition located on the eastern coast of Maine with ages ranging from Late Silurian to Early Carboniferous. Plutons in this complex display a bimodal character (Chapman, 1962), with evidence for mafic and felsic magma mingling (Chapman, 1962; Wiebe, 1993). Gravity studies imply that these plutons are less than a few kilometers thick with shallow dipping floors and steep walls, underlain by mafic sheets (Sweeney, 1976; Hodge et al., 1982). These intrusions follow a NE-trend within fault-bounded continental crust that accreted onto the North American craton prior to Acadian orogenesis (Hogan and Sinha 1989, Wiebe et al. 2004). Hogan and Sinha (1989) suggested that the coastal Maine magmatic province intruded the older crust during a post-collisional, extensional rifting event related to the Acadian Orogeny (Coombs, 1994; Wiebe et al., 1997a). 2.2. Cadillac Mountain Intrusive Complex The Cadillac Mountain intrusive complex of Mount Desert Island (Figure 2.1) is part of the Coastal Maine Magmatic Province (Hogan and Sinha, 1989). The complex is roughly circular in map view covering an approximate area of 14km x 20km, and consists of the Cadillac Mountain Granite and the younger 4
Page 1 and 2: FRACTAL ANALYSIS AND THERMAL-ELASTI
Page 3 and 4: LIBRARY RIGHTS STATEMENT In present
Page 5 and 6: emplacement of mafic magma, resulti
Page 7 and 8: © 2011 Samuel Geoffrey Roy All Rig
Page 9 and 10: TABLE OF CONTENTS ACKNOWLEDGEMENTS
Page 11 and 12: 5.3.5. Clast Circularity Analysis .
Page 13 and 14: LIST OF FIGURES Figure 2.1. Figure
Page 15 and 16: LIST OF TABLES Table 6.1. Table 7.1
Page 17: subvolcanic magmatic systems, the l
Page 21 and 22: Somesville granite suite to the wes
Page 23 and 24: Biotite is metamorphic in origin, a
Page 25 and 26: Chapter 3 PHYSICAL DESCRIPTION OF S
Page 27 and 28: thinned lithosphere allows for part
Page 29 and 30: A B C Figure 3.1. Formation of a la
Page 31 and 32: 1997; Branney and Kokelaar, 1998; J
Page 33 and 34: Effusive-Type Eruption max 10 0 - 1
Page 35 and 36: magma quickly intrudes the develope
Page 37 and 38: Piston Downsag Piecemeal Funnel Tra
Page 39 and 40: fragmentation, and thermal energy h
Page 41 and 42: Chapter 4 THERMAL FRAMEWORK FOR CON
Page 43 and 44: contrast, conduction is heat transf
Page 45 and 46: A B Grt C Grt D Crd Crd E 1 mm F Cr
Page 47 and 48: ! ! ! ! Biotite Zone Garnet Zone !
Page 49 and 50: 4.3.1. Model Setup The model is use
Page 51 and 52: to make a “hockey puck” style g
Page 53 and 54: t = 0s t = 1E11 t = 1E12s t = 1E13s
Page 55 and 56: 850 750 650 550 450 400m Into Chamb
Page 57 and 58: approximately 140m thinner. The Sha
Page 59 and 60: Chapter 5 ROCK MECHANICS AND THE FR
Page 61 and 62: A β δ σ 1 σ 3 σ t c a σ 1 σ
Page 63 and 64: friction along the closed crack sur
Page 65 and 66: h h/2 h/4 Figure 5.2. A cube displa
Page 67 and 68: where N (≥r) is the count of clas
Page 69 and 70:
to place a minimum size limit when
Page 71 and 72:
moment of sudden fracture tip failu
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produced results in a self-similar
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13 ln(area) (pixels) 12 11 10 9 ln(
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eaction processes were involved in
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Chapter 6 ANALYSIS AND RESULTS The
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Type 1 Type 2 500 m N Type 1 Type 2
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A B Figure 6.3. Type 2 Shatter Zone
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A B Figure 6.5. Centimeter-scale bo
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A B Figure 6.6. Brecciation texture
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The final breccia classified in thi
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esolution images of each box were s
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Clast circularity data were produce
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A 1000 Clast Size Distribu on: Type
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diorite dike with D s = 2.62 and R
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6.3.3. Clast Circularity Analysis (
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with decreasing clast size in all T
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possibilities as postulated previou
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Chapter 7 MECHANISMS FOR SECONDARY
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magma. To prove the viability of th
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mesh to better evaluate large therm
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consistent with Type 3 breccias. Th
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A temperature versus time plot was
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Dimensionless time 0 0.05 0.1 0.15
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Figure 7.4 displays model results f
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thermal model ignores advection of
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Zone experienced a relatively weake
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7.4. Thermal-Induced Fracture Field
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Metapelite/hornfels Diorite dike E
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7.4.2. Results and Discussion COMSO
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This thermal fracture model explain
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disaggregation of Bar Harbor clasts
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REFERENCES Acocella, V. (2007). Und
Page 135 and 136:
Billen, M.I. and Gurnis, M. (2001).
Page 137 and 138:
Clarke, D. B. (2007). Assimilation
Page 139 and 140:
Fisher, R.V. (1960). Classification
Page 141 and 142:
Hartmann, W.K. (1969). Terrestrial,
Page 143 and 144:
Johnson, S.E.; Paterson, S.R.; Tate
Page 145 and 146:
Mandelbrot, B.B. (1967). How long i
Page 147 and 148:
Oliver, N.H.S.; Rubenach, M.J.; Fu,
Page 149 and 150:
Schoutens, J.E. (1979). Empirical A
Page 151 and 152:
Wiebe, R.; Holden, J.; Coombs, M.;
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sgr ms thesis - University of Maine

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