FIAs (foliation intersection/inflection axes) preserved in porphyroblasts, the DNA of deformation: a solution to the puzzle of deformation and metamorphism in the Colorado, Rocky Mountains, USA

Shah, A.A. (2009) FIAs (foliation intersection/inflection axes) preserved in porphyroblasts, the DNA of deformation: a solution to the puzzle of deformation and metamorphism in the Colorado, Rocky Mountains, USA. Acta Geologica Sinica, 83 (5). pp. 971-984.

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Abstract

FIAs have been used extensively for more than a decade to unravel deformation and metamorphic puzzles. Orogenic processes developing early during the history or orogenesis challenge scientists because compositional layering in the rocks always reactivates where multiple deformations have occurred, leaving little evidence of the history of foliation development preserved in the matrix. The foothills of the Rocky Mountains in Colorado, USA contain a succession of four FIA sets (trends) that would not have been distinguishable if porphyroblasts had not grown during the multiple deformation events that affected these rocks or if they had rotated as these events took place. They reveal that both the partitioning of deformation and the location of isograds changed significantly as the deformation proceeded.

Item ID: 8755
Item Type: Article (Research - C1)
ISSN: 1755-6724
Keywords: foliation intersection/inflection axes; porphyroblast; deformational partitioning
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Date Deposited: 04 Mar 2010 01:31
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040312 Structural Geology @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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