AMS study of the Pont-de-Montvert-Borne porphyritic granite pluton (French Massif Central) and its tectonic implications

Details AMS study of the Pont-de-Montvert-Borne porphyritic granite pluton (French Massif Central) and its tectonic implications AMS study of the Pont-de-Montvert-Borne porphyritic granite pluton (French Massif Central) and its tectonic implications

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.140..677t&link_type=abstract

Geophysical Journal International, Volume 140, Issue 3, pp. 677-686.

Astronomy and Astrophysics

Astronomy

2

Ams, French Massif Central, Hercynian Belt, Pluton Emplacement

Scientific paper

Thermomagnetic experiments, isothermal remanent magnetization (IRM), hysteresis loops, X-ray reflection analyses, optic microscopic observations, bulk magnetic susceptibility and natural remanent magnetization (NRM) show that the susceptibility signal of 56 sites in the Pont-de-Montvert-Borne pluton is derived mostly from biotite with a very small proportion of ferromagnetic material. Low anisotropy degree (P parameter) and consistent AMS orientations among monzonite, enclaves and aplitic dykes indicate that the AMS was acquired during pluton emplacement in the subsolidus phase. Magnetic fabrics demonstrate that linear deformation is prominent in the area where the granite is in direct contact with micaschists, and that planar deformation becomes more important in the area where the pluton is surrounded by non-porphyritic peraluminous granites. AMS measurements also show that shallow plunging E-W-stretching lineations are the dominant structure over most of the studied area. Foliation orientations follow the pluton contour in the western part, indicating that the Pont-de-Montvert-Borne pluton is probably rooted in the west and extruded towards the east. These AMS results agree to some extent with fabric inferred from mineral preferred orientation. The AMS data support an E-W extensional tectonic setting during the Pont-de-Montvert-Borne pluton emplacement, which resulted from the Late Carboniferous crustal thinning of the Hercynian orogeny.

Affiliated with

Also associated with

No associations

Rating

AMS study of the Pont-de-Montvert-Borne porphyritic granite pluton (French Massif Central) and its tectonic implications 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 AMS study of the Pont-de-Montvert-Borne porphyritic granite pluton (French Massif Central) and its tectonic implications, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and AMS study of the Pont-de-Montvert-Borne porphyritic granite pluton (French Massif Central) and its tectonic implications will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1290747