Mathematics – Logic
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011e%26psl.308...77m&link_type=abstract
Earth and Planetary Science Letters, Volume 308, Issue 1, p. 77-89.
Mathematics
Logic
2
Magnetite, Fabric, Deformation, Granite, Anisotropy Of Anhysteretic Remanence Magnetization, Electron Back Scattered Diffraction
Scientific paper
This study evaluates the fabric defined by magnetite grains in a syntectonically deformed granite and deciphers the processes that led to magnetite fabric development. Anisotropy of anhysteretic remanence magnetization (AARM) analysis is performed in samples taken from different parts of the granite to establish that the magnetite grains define a fabric. Along with microstructural studies, the AARM data help conclude that this fabric is on account of shape preferred orientation (SPO) of the magnetite grains. The intensity of magnetite fabric (degree of anisotropy of the AARM ellipsoid) is higher in the southern parts as compared to the north, which is inferred to indicate a strain gradient. Electron back scattered diffraction (EBSD) analyses of magnetite grains were performed to determine if there are intracrystalline deformation features that could have influenced magnetite shape and SPO, and thus AARM data. Detailed crystallographic orientation data coupled with orientation contrast imaging did not reveal any subgrains and/or significant variations in crystallographic orientations within magnetite grains. Instead, grains exhibit fractures and are in places associated with quartz pressure fringes. Hence, neither the SPO nor the variation in the magnetite fabric intensity in the granite can be attributed to intracrystalline deformation of magnetite by dislocation creep. It is concluded that the magnetite grains were rheologically rigid and there was relative movement between the magnetite and the matrix minerals (quartz, feldspar and biotite). These matrix minerals actually define the fabric attractor and the magnetite grains passively rotated to align with it. Thus it is demonstrated that the magnetite fabric in the granite stems from rigid body movement rather than dislocation creep.
Greiling Reinhard O.
Hrouda František
Kontny Agnes
Mamtani Manish A.
Piazolo Sandra
No associations
LandOfFree
Process of magnetite fabric development during granite deformation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Process of magnetite fabric development during granite deformation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process of magnetite fabric development during granite deformation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1673164