The wide-angle seismic image of a complex rifted margin, offshore North Namibia: Implications for the tectonics of continental breakup

2017 ◽  
Vol 716 ◽  
pp. 130-148 ◽  
Author(s):  
Lars Planert ◽  
Jan Behrmann ◽  
Wilfried Jokat ◽  
Tanja Fromm ◽  
Trond Ryberg ◽  
...  
Keyword(s):  
Wide Angle ◽  
Continental Breakup ◽  
Seismic Image ◽  
Rifted Margin

scholarly journals Factors influencing magmatism during continental breakup: New insights from a wide-angle seismic experiment across the conjugate Seychelles-Indian margins

2009 ◽  
Vol 114 (B3) ◽  
Author(s):  
J. S. Collier ◽  
T. A. Minshull ◽  
J. O. S. Hammond ◽  
R. B. Whitmarsh ◽  
J.-M. Kendall ◽  
...  
Keyword(s):  
Wide Angle ◽  
Continental Breakup ◽  
Factors Influencing ◽  
Seismic Experiment

Seismic image of undercrusted serpentinite beneath a rifted margin

Terra Nova ◽  
1992 ◽  
Vol 4 (1) ◽  
pp. 25-33 ◽  
Author(s):  
Gilbert Boillot ◽  
Marie-Odile Beslier ◽  
Maria Comas
Keyword(s):  
Seismic Image ◽  
Rifted Margin

Evidence for a Prolonged Continental Breakup Resulting From Slow Extension Rates at the Eastern North American Volcanic Rifted Margin

2020 ◽  
Vol 125 (9) ◽  
Author(s):  
Anne Bécel ◽  
Joshua K. Davis ◽  
Brandon D. Shuck ◽  
Harm J. A. Van Avendonk ◽  
James C. Gibson
Keyword(s):  
North American ◽  
Continental Breakup ◽  
Rifted Margin

Continental breakup and the onset of ultraslow seafloor spreading off Flemish Cap on the Newfoundland rifted margin

Geology ◽  
2004 ◽  
Vol 32 (1) ◽  
pp. 93 ◽  
Author(s):  
John R. Hopper ◽  
Thomas Funck ◽  
Brian E. Tucholke ◽  
Hans Christian Larsen ◽  
W. Steven Holbrook ◽  
...  
Keyword(s):  
Seafloor Spreading ◽  
Continental Breakup ◽  
Rifted Margin

CBED Shadow Images and Cs:Aberration Measurement

1982 ◽  
Vol 40 ◽  
pp. 696-697
Author(s):  
R. W. Carpenter ◽  
I.Y.T. Chan ◽  
J. M. Cowley
Keyword(s):  
Focal Point ◽  
Spherical Aberration ◽  
Optic Axis ◽  
Wide Angle ◽  
Caustic Surface ◽  
Convergent Beam

Wide-angle convergent beam shadow images(CBSI) exhibit several characteristic distortions resulting from spherical aberration. The most prominent is a circle of infinite magnification resulting from rays having equal values of a forming a cross-over on the optic axis at some distance before reaching the paraxial focal point. This distortion is called the tangential circle of infinite magnification; it can be used to align and stigmate a STEM and to determine Cs for the probe forming lens. A second distortion, the radial circle of infinite magnification, results from a cross-over on the lens caustic surface of rays with differing values of ∝a, also before the paraxial focal point of the lens.

Reconstruction of Chitin-Protein Complexes Using Correlation Averaging Methods: Ovipositor of the Ichneumon Fly Megarhyssa

1980 ◽  
Vol 38 ◽  
pp. 38-39
Author(s):  
L. T. Germinario ◽  
J. Blackwell ◽  
J. Frank
Keyword(s):  
Protein Complexes ◽  
Hexagonal Lattice ◽  
Uranyl Acetate ◽  
Optical Diffraction ◽  
Insect Cuticle ◽  
High Dose ◽  
Wide Angle ◽  
X Ray ◽  
Averaging Methods ◽  
Digital Correlation

This report describes the use of digital correlation and averaging methods 1,2 for the reconstruction of high dose electron micrographs of the chitin-protein complex from Megarhyssa ovipositor. Electron microscopy of uranyl acetate stained insect cuticle has demonstrated a hexagonal array of unstained chitin monofibrils, 2.4−3.0 nm in diameter, in a stained protein matrix3,4. Optical diffraction Indicated a hexagonal lattice with a = 5.1-8.3 nm3 A particularly well ordered complex is found in the ovipositor of the ichneumon fly Megarhyssa: the small angle x-ray data gives a = 7.25 nm, and the wide angle pattern shows that the protein consists of subunits arranged in a 61 helix, with an axial repeat of 3.06 nm5.

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