Correlation between deformation lamellae, microfractures, macrofractures, and in situ stress measurements, White River Uplift, Colorado

Dula, William F.

doi:10.1130/0016-7606(1981)92<37:cbdlmm>2.0.co;2

Cited by 22 publications

(7 citation statements)

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“…However, as already noted, the orientation distribution of microcracks in quartz is much more complex, and often consists of two or three orthogonal sets (e.g. Tuttle 1949; Dula 1981; Lespinasse & Pêcher 1986; Vollbrecht et al 1991; Takeshita 1995; Takeshita et al 1996, 1997; Dezayes et al 2000; Harrison & Onash 2000). It has been found that each of two or three orthogonal sets of microcracks in quartz is oriented perpendicular to each of two or all three of the principal paleostress directions, although different ideas have been proposed for their origin (Vollbrecht et al 1991, 1999; Takeshita 1995; Dezayes et al 2000).…”

Section: Introductionmentioning

confidence: 94%

Paleostress orientation from 3‐D orientation distribution of microcracks in quartz from the Cretaceous granodiorite core samples drilled through the Nojima Fault, south‐west Japan

Takeshita¹,

Yagi²

2001

Island Arc

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The orientations of both healed extension microcracks and microcracks in quartz grains sealed mostly by carbonate minerals were measured from Cretaceous granodiorite core samples drilled along the Nojima Fault, southwest Japan. The preferred orientations of both healed and sealed microcracks consist of approximately three orthogonal sets, (components) A, B and C, in which A strikes NS-NW-SE and dips vertically, B strikes EW-NE-SW and dips vertically, and C is subhorizontal. Both the healed and sealed microcracks were possibly formed by hydraulic fracturing, and the successive release of tensile stress due to pore fluid overpressure in the principal stress directions could have caused this microcracking in mutually orthogonal directions. The quartz grains are also very moderately plastically deformed, which is indicated by the occurrence of kink bands and undulose extinction. The association of healed microcracks and kink bands in the quartz suggests that these microstructures formed under subgreenschist facies conditions (ª300∞C) during hydrothermal activity that could have occurred immediately after the emplacement of granodiorite during the Late Cretaceous period. Based on both the preferred orientation of microcracks, and c-axis fabrics of kinked and unkinked grains (so called kink method), it is inferred that the s 1 -and s 3 -axis were oriented horizontally in NS-NW-SE and EW-NE-SW directions, respectively. The inferred paleostress field does not conform to the east-west-trending compression during the Quaternary period, but to the activation of EW-NE-SW-trending, left-lateral strike-slip faults during the Late Cretaceous period in southwest Japan.

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Section: Introductionmentioning

confidence: 94%

Paleostress orientation from 3‐D orientation distribution of microcracks in quartz from the Cretaceous granodiorite core samples drilled through the Nojima Fault, south‐west Japan

Takeshita¹,

Yagi²

2001

Island Arc

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“…Various aspects of the surface pattern of joints in the Grand Hogback monocline were mapped or studied by Harper (1964), Murray (1966Murray ( , 1967, Dula (1981Dula ( , 1984, and Garrett and Lorenz (1989). In the Piceance basin, Smith and Whitney (1979) mapped orientations of fractures both in outcrop and from aerial photographs, Kelley and Clinton (1960) and Welder (1971) mapped fracture patterns from aerial photographs, and Clark (1983) mapped fractures in outcrop and in core in an attempt to interpret aspects of the late Cenozoic stress history of the southeastern part of the basin.…”

Section: Procedures and Techniquesmentioning

confidence: 99%

Fracture history of the Divide Creek and Wolf Creek anticlines and its relation to Laramide basin-margin tectonism, southern Piceance Basin, northwestern Colorado

Grout¹,

Verbeek²

1991

Open-File Report

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Zl Introduction Zl General geology Z2 Lithology Z5 Structural setting Z6 Economic significance of fractures Z6 Previous studies of joints in the Piceance basin Z7 Procedure and techniques Z7 Joint sets of the Piceance basin and Grand Hogback monocline Z8 Piceance system Z8 Hogback system Z10 Joint sets of the Divide Creek and Wolf Creek anticlines Z10 Discussion Z14 Distribution of MV2 set Z15 Presence and prominence of local fold-parallel fractures Z16 Distribution of fractures of the Piceance system Z18 Fracture history and fluid movement Z20 Timing of fracture formation Z20 Fluid movement through upper Mesaverde and lower Wasatch strata Z22 Comments on coal Z22 Concluding remarks Z22 References cited Z23 Appendix Summary of characteristics of fracture sets Z28 FIGURES 1-2. Maps showing: 1. Location of study area, late Paleozoic uplifts, and Tertiary basins and uplifts, northeastern part of Colorado Plateau and adjacent Rocky Mountain foreland Z3 2. Geology of area of Divide Creek and Wolf Creek anticlines and part of Grand Hogback monocline Z4 3. Vertical section through study area showing combined interpretation of seismic, gravity, and drill-hole data Z5 4 6. Maps showing: 4. Regional distribution and orientation of joints of Fj F4 sets in Piceance basin Z9 5. Average orientation of joints of MV2 fracture set in study area, southern Piceance basin Z12 6. Average orientation of joints of fold-parallel fracture sets in study area, southern Piceance basin Z13 7. Photographs showing fold-parallel fractures in sandstone bed of Wasatch Formation on Divide Creek anticline Z14 8. Map showing average orientation of joints of F: fracture set in study area, southern Piceance basin Z15 Contents III IV Contents

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“…Microfractures occur abundantly in granite from the test sites, and have been analyzed to determine their significance to the interpretation of regional deformation. An analysis of microfractures can provide clues regarding rock anistropy, deformability, and the possible correlation of micro-and macrostructures (Brace, 1965;Dula, 1981). In some instances, the relative ages of microfractures can be determined.…”

Section: Joints and Microfracturesmentioning

confidence: 99%

Geomechanical aspects of subsidence in eastern Maine

Lee¹

1985

Open-File Report

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Information from several sources indicates that the eastern Maine coast is subsiding. Recent releveling surveys indicate a current rate of subsidence in eastern Maine as much as 9 mm per year relative to Bangor. The anomalously rapid rise in sea level accompanying the subsidence has led to shoreline erosion, landsliding, and submergence of archaeological sites and historical manmade structures. In situ stress measurements, well-bore breakouts, and earthquake focal mechanisms show that the maximum principal stress is horizontal, strikes N 80° E, and is correctly oriented to produce thrusting on north-south faults, right-lateral motion with minor thrusting on northeast and east-northeast faults, and major thrusting with left-lateral motion on northwest-striking faults. Maximum seismicity in Maine occurs in the subsiding zone which also includes the maximum (positive) gravity anomaly in the State. Epicenters are diffusety aligned with the Oak Bay fault which strikes N 20° W. Deflection of isobase lines drawn on ice-marginal deltas forms a trough whose axis strikes approximately parallel to the Oak Bay fault. An acceptable contemporary crustal deformation model should incorporate zones of contrasting rock density and intensity of fracturing, localized seismicity, east-west tectonic compression, and weak compression or extension in the north-south direction.

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Correlation between deformation lamellae, microfractures, macrofractures, and in situ stress measurements, White River Uplift, Colorado

Cited by 22 publications

References 0 publications

Paleostress orientation from 3‐D orientation distribution of microcracks in quartz from the Cretaceous granodiorite core samples drilled through the Nojima Fault, south‐west Japan

Paleostress orientation from 3‐D orientation distribution of microcracks in quartz from the Cretaceous granodiorite core samples drilled through the Nojima Fault, south‐west Japan

Fracture history of the Divide Creek and Wolf Creek anticlines and its relation to Laramide basin-margin tectonism, southern Piceance Basin, northwestern Colorado

Geomechanical aspects of subsidence in eastern Maine

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