Microstructures of the serpentine veins from TEM imaging. a, b ...
Microstructures of the serpentine veins from TEM imaging . a , b HAADF-STEM images (sample regions: RL1 and r1-8, respectively) showing a transition from mesh rim columnar lizardite to randomly ...
Microstructures of the serpentine veins from TEM imaging . a , b HAADF-STEM images (sample regions: RL1 and r1-8, respectively) showing a transition from mesh rim columnar lizardite to randomly oriented serpentine mesh core. c HAADF-STEM depicting the nanoporous mesh core region adjacent to the olivine- serpentine interface (sample region: r2 ...
A microstructural study of a crack
This model provides a possible origin for the enhancement and maintenance of a diffusional mass transfer from the matrix to the crack. This model also predicts the very good tracking of vein opening directions in such veins . Keywords key-words: serpentine • microstructures • crack-seal • growth • tem
We have selected a representative set of veins from ocean floor serpentinites of the Mid-Atlantic Ridge near Kane transform fault (23°N) and characterized these in detail for their microstructures and chemistry by coupling optical and electron microscopy (SEM, TEM ) with electron microprobe analyses.
Serpentine veins (a
Download scientific diagram | Serpentine veins (a-d) and pseudomorphic carbonate microstructures after serpentine textures (e, f) in serpentinite. ( a ) Mesh (ss0) and bastite textured serpentinite ...
Serpentine minerals have received a lot of attention because of their unique crystal structures, their wide occurrence in orogenic belts and their potential role in contributing seismic anisotropy in subducting slabs. Several studies have investigated crystal preferred orientation (CPO) in high temperature antigorite serpentinites from Japan, the Alps, Spain, Cuba and Tibet, documenting ...
Microstructures and Chemistry of Serpentine Minerals in Veins ...
We have selected a representative and extensive set of veins from oceanic serpentinites. We present a detailed chemical, micro- and nano-structural study of the vein -filling serpentine minerals. Vein formation mechanisms are deduced from morphology and texture which then provide constraints on serpentine crystallization conditions.
Using recently developed techniques of Raman spectroscopy mapping, combined with scanning- and transmission-electron microscopy, we describe a new type of mineralogically banded serpentine crack-seal vein in six samples from different settings around the world.
A microstructural study of a crack
The double cross pattern represents the serpentinized peridotite matrix. Dotted lines accross v2 follow optical "trails". d: Geometry of the vein tip. This indicates that increments are preferentially younger from the right to the left. - " A microstructural study of a "crack-seal" type serpentine vein using SEM and TEM techniques"
The banded internal structure and the filling along the vein -wall contact suggest a crack-seal mechanism of formation. Each crack is homogeneously filled with chrysotile and some rare polygonal serpentines (tubular serpentine varieties) and disseminated patches of gel-type protoserpentine.