Abstract

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.

LLU Discipline

Earth Sciences

Department

Basic Sciences

School

School of Medicine

First Advisor

Clausen, Benjamin L.

Second Advisor

Nalin, Ronald

Third Advisor

Nick, Kevin E.

Fourth Advisor

Paterson, Scott

Fifth Advisor

Perry, Christopher C.

Degree Name

Doctor of Philosophy (PhD)

Degree Level

Ph.D.

Year Degree Awarded

2016

Date (Title Page)

9-2016

Language

English

Library of Congress/MESH Subject Headings

Geology - Structural -- Peru; Intrusions (Geology) -- Peru -- Ica Region; Batholiths -- Peru -- Ica Region; Magmatism -- Peru -- Ica Region; Island Arcs -- Peru -- Ica Region; Geochemical Modeling

Subject - Local

Granitic Plutons; Crustal Recycling; Magma Mixing; Mantal and Crustal Magma; Crystallization; Elemental and Isotope Geochemistry

Type

Dissertation

Page Count

427

Digital Format

PDF

Digital Publisher

Loma Linda University Libraries

Usage 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.

Collection

Loma Linda University Electronic Theses and Dissertations

Collection Website

http://scholarsrepository.llu.edu/etd/

Repository

Loma Linda University. Del E. Webb Memorial Library. University Archives

Download

Share

COinS