Recovery of surfaces from impurity poisoning during crystal growth
Article Abstract:
Atomic force microscopy has been used to analyze the potassium dihydrogen phosphate crystal surface as it emerges from the 'dead zone,' a regime of low supersaturation where growth stops. It has been established that resurrection out of the dead zone is not prompted by elementary steps breaking through the fence of impurities. Instead, it takes place by the motion of macrosteps alone. Impurities are only able to pin individual elementary steps. Therefore, all impurity pinning sites within the macrostep are buried by the rest of the macrostep, apart from those along the uppermost step.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Corrugated slip surfaces formed at ridge-transform intersections on the Mid-Atlantic Ridge
Article Abstract:
Sonar images of two ridge-transform intersections on the Mid-Atlantic Ridge show both active and 'fossil' inside-corner highs capped by planar, dipping surfaces with corrugations and striations oriented parallel to the plate spreading direction. These inside-corner highs are topographic highs where plutonic rocks can often be found. The slip surfaces dip at much superficial angles than expected, probably because of the lubricating action of serpentinized peridotite.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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Abyssal hills formed by stretching oceanic lithosphere
Article Abstract:
A numerical model has been developed to describe stretching oceanic lithospheric formation and abyssal hills. The self-consistent model forms an axial valley at points of spontaneous fault creation on the ocean floor. Evidence suggests that faults occur in abyssal hills due to modifications in the local stress field. Ridge-parallel abyssal-hill topography is illustrated, together with strain cross-section analysis.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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