Compositional Diversity in Arcs: A Record of Magmatic Processes in the Peru Coastal Batholith, Ica

<p>Peruvian granitic plutons display evidence for crustal recycling and magma mixing. Evidence of physical and chemical processes operating during the formation of the Ica-Pisco complexes involves magma mixing and mingling as result of felsic and mafic interactions. Evidence of crustal recycling was identified from kilometer-scale cauldron subsidence, meter and centimeter-scale -stoping, and disaggregation. At the petrographic microscope scale, evidence for recycling and mixing between mantle and crustal magma during crystallization is found from disequilibrium features such as reaction rims, resorbed cores, and patchy zoning. Elemental and isotope geochemistry data indicate that mantle magmas have incorporated continental crust material from varying depths and sources and in increasing amounts with time. Some uranium and lead isotope single-crystal zircon analyses also indicate varying source components. The research concluded that the source of the granitic magmas making up the plutons near Ica, Peru is about half from the mantle and half from recycled crust made up of Precambrian lower crust and Phanerozoic upper crust consisting of volcanic, sedimentary, and earlier plutonic units at the emplacement level.</p>

Name thesis:degree_name

Doctor of Philosophy (PhD)

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Basic Sciences

Year

2016

Author dc:creator

• Ardila, Ana Maria Martinez

Contributors dc:contributor

• Clausen, Benjamin L.
• Nalin, Ronald
• Nick, Kevin E.
• Paterson, Scott
• Perry, Christopher C.

• Earth Sciences
• Geochemistry
• Geology
• Physical Sciences and Mathematics
• Geology - Structural -- Peru; Intrusions (Geology) -- Peru -- Ica Region; Batholiths -- Peru -- Ica Region; Magmatism -- Peru -- Ica Region; Island Arcs -- Peru -- Ica Region; Geochemical Modeling
• Granitic Plutons; Crustal Recycling; Magma Mixing; Mantal and Crustal Magma; Crystallization; Elemental and Isotope Geochemistry

Statement dc:rights

• This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.

Language dc:language

English

Repository record dc:identifier

https://scholarsrepository.llu.edu/etd/389

OAI identifier oai:identifier

oai:scholarsrepository.llu.edu:etd-1392