Relationship between Mesozoic and Cenozoic Tectonic features in west central Arizona and adjacent southeastern California

J. E. Spencer, Stephen Reynolds

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The Maria fold-and-thrust belt (MFTB) is a narrow belt of Mesozoic crustal shortening that trends east-west across west central Arizona and adjacent southeastern California. It is characterized by generally south vergent folds and thrusts that commonly displace Proterozoic crystalline rocks over deformed and metamorphosed Paleozoic and Mesozoic strata. The MFTB is cut by a south to southeast trending belt of mid-Tertiary extensional deformation. Extension was characterized by large displacements on low-angle normal faults, known as detachment faults, and by isostatic uplift of mylonitic midcrustal rocks now exposed in metamorphic core complexes. The geometry and style of extensional deformation change along the extensional belt and reveal the influence of the MFTB. Several extensional features are spatially coincident with the root zone of MFTB thrusts. -from Authors

Original languageEnglish (US)
Pages (from-to)539-555
Number of pages17
JournalJournal of Geophysical Research
Volume95
Issue numberB1
StatePublished - 1990
Externally publishedYes

Fingerprint

tectonic feature
fold and thrust belt
Tectonics
tectonics
thrust
maria
detachment fault
crustal shortening
crystalline rock
normal fault
rhizosphere
Proterozoic
Crystalline rocks
rocks
Paleozoic
uplift
fold
geometry
strata
detachment

ASJC Scopus subject areas

  • Medicine(all)
  • Engineering(all)

Cite this

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abstract = "The Maria fold-and-thrust belt (MFTB) is a narrow belt of Mesozoic crustal shortening that trends east-west across west central Arizona and adjacent southeastern California. It is characterized by generally south vergent folds and thrusts that commonly displace Proterozoic crystalline rocks over deformed and metamorphosed Paleozoic and Mesozoic strata. The MFTB is cut by a south to southeast trending belt of mid-Tertiary extensional deformation. Extension was characterized by large displacements on low-angle normal faults, known as detachment faults, and by isostatic uplift of mylonitic midcrustal rocks now exposed in metamorphic core complexes. The geometry and style of extensional deformation change along the extensional belt and reveal the influence of the MFTB. Several extensional features are spatially coincident with the root zone of MFTB thrusts. -from Authors",
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AB - The Maria fold-and-thrust belt (MFTB) is a narrow belt of Mesozoic crustal shortening that trends east-west across west central Arizona and adjacent southeastern California. It is characterized by generally south vergent folds and thrusts that commonly displace Proterozoic crystalline rocks over deformed and metamorphosed Paleozoic and Mesozoic strata. The MFTB is cut by a south to southeast trending belt of mid-Tertiary extensional deformation. Extension was characterized by large displacements on low-angle normal faults, known as detachment faults, and by isostatic uplift of mylonitic midcrustal rocks now exposed in metamorphic core complexes. The geometry and style of extensional deformation change along the extensional belt and reveal the influence of the MFTB. Several extensional features are spatially coincident with the root zone of MFTB thrusts. -from Authors

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