Rheological inheritance: lessons from the Death Valley region, US Basin and Range
Province
Posted on 2018-05-17 - 10:23
Rheological inheritance occurs when older metamorphic and deformational fabrics
impact the mechanics of younger tectonic provinces, such as occurs in extensional provinces
developed on sites of previous orogenesis. The Funeral and Black Mountains from the Death
Valley region of the US Basin and Range provide the opportunity to study such rheological
inheritance. The Funeral Mountains expose shear zones containing high-grade metamorphic
fabrics and evidence for synkinematic, decompression-driven melt of Late Cretaceous, orogenic
origin. Quartz <c> and [a]-axes
patterns from the shear zones correlate with high-temperature slip systems. The quartz
microstructures were formed via grain-boundary migration, and these are overprinted by
high-strain layers of mixed-phase aggregates that underwent grain boundary sliding. Reaction
textures from the Funeral Mountains illustrate that much of the fabric development post-dates
melting, but locally involved melt–rock reactions. In contrast with the Funeral Mountains, the
basement complex in the Black Mountains preserves few peak-metamorphic textures, largely owing
to the overprinting by Cenozoic magmatism and deformation. However, local relicts of high-grade
deformational fabrics yielding Late Cretaceous-through-Eocene magmatic zircon ages are
overprinted by greenschist grade fabrics. Using outcrop and microstructural (including
electron backscatter diffraction) observations, and thermodynamic modelling, we detail how
segregation of melt products during orogenic partial melting resulted in chemically isolated
compositional domains, favouring localization via the formation of fine-grained retrograde
fabrics. We propose a conceptual model that builds on our results wherein the heterogeneous
distribution of peak, orogenic metamorphic phases and melt products governs lower crustal
strength and fabric evolution during extension. The Wilson Cycle may be sensitive to
rheological inheritance as the width of continental margins formed during rifting will be
sensitive to the fabrics and compositions formed during collision.
CITE THIS COLLECTION
DataCite
3 Biotech
3D Printing in Medicine
3D Research
3D-Printed Materials and Systems
4OR
AAPG Bulletin
AAPS Open
AAPS PharmSciTech
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg
ABI Technik (German)
Academic Medicine
Academic Pediatrics
Academic Psychiatry
Academic Questions
Academy of Management Discoveries
Academy of Management Journal
Academy of Management Learning and Education
Academy of Management Perspectives
Academy of Management Proceedings
Academy of Management Review
Lima, Rodrigo D.; Hayman, Nicholas W.; Miranda, Elena (2018). Rheological inheritance: lessons from the Death Valley region, US Basin and Range
Province. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.4103159.v1
or
Select your citation style and then place your mouse over the citation text to select it.
SHARE
Usage metrics
Read the peer-reviewed publication
AUTHORS (3)
RL
Rodrigo D. Lima
NH
Nicholas W. Hayman
EM
Elena Miranda