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Isotopic, Geochemical, and Textural ...

Beno, Carl Joseph.

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Isotopic, Geochemical, and Textural Constraints on the Timing, Duration, and Rates of Infiltration-Driven Contact Metamorphism Surrounding the Alta, Utah Stock.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Isotopic, Geochemical, and Textural Constraints on the Timing, Duration, and Rates of Infiltration-Driven Contact Metamorphism Surrounding the Alta, Utah Stock./
Author:	Beno, Carl Joseph.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2022,
Description:	178 p.
Notes:	Source: Dissertations Abstracts International, Volume: 84-05, Section: B.
Contained By:	Dissertations Abstracts International84-05B.
Subject:	Geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28967626
ISBN:	9798357570437

Isotopic, Geochemical, and Textural Constraints on the Timing, Duration, and Rates of Infiltration-Driven Contact Metamorphism Surrounding the Alta, Utah Stock.
Beno, Carl Joseph.

Isotopic, Geochemical, and Textural Constraints on the Timing, Duration, and Rates of Infiltration-Driven Contact Metamorphism Surrounding the Alta, Utah Stock. - Ann Arbor : ProQuest Dissertations & Theses, 2022 - 178 p.

Source: Dissertations Abstracts International, Volume: 84-05, Section: B.

Thesis (Ph.D.)--The University of Utah, 2022.

This item must not be sold to any third party vendors.

In the following three chapters I present petrologic and geochemical evidence for the rapid metamorphism of siliceous carbonate strata driven by infiltration of reactive H2O-rich fluids during contact metamorphism associated with the protracted emplacement and construction of the Alta stock.Chapter 1 provides textural and geochemical evidence for the widespread development of skeletal forsterite crystals formed during infiltration-driven metamorphism in the Alta dolomites. Highly overstepped forsterite petrogenesis drives dendritic growth and is documented with single-crystal images and grain-scale trace element profiles. These data caution against the utilization of "core-to-rim" relative timing conventions when interpreting 2D geochemical or isotopic datasets.Chapter 2 summarizes the oxygen isotope measurements that were performed on a suite of rocks from the inner Alta aureole to constrain the grain-scale variation in d18O and to calculate mineral-mineral fractionation factors. I posit that the observed disequilibrium of calcite-forsterite pairs is either the result of kinetic effects occurring during forsterite petrogenesis, or post crystallization isotope exchange and continued depletion of the less refractory calcite during the initial stages of cooling/retrogradation. Detailed isotope work in coexisting calcite and forsterite from site 94I is combined with textural analysis to reveal asynchronous infiltration and metamorphism of two adjacent marble layers. These findings demonstrate the linkage between metamorphism and permeability development/destruction over the timescales of infiltration-driven metamorphism.Two distinct generations of dikes/sills crop out in the inner aureole; an older intermediate granodioritic phase, and a younger generation of leucocratic aplite/pegmatite. U-Pb dating results from zircon and monazite from the inner aureole are presented in Chapter 3. These data suggest the onset of emplacement began at ~36.5 Ma with the last batch of evolved magmas, represented by the leucocratic aplite/pegmatite dike/sills, being emplaced as late as ~29 Ma. These data are consistent with U-Pb constraints from the associated Alta stock, however, the protracted hydrothermal history recorded in the margin of the Alta stock (down to ~23 Ma) is not recorded by these rocks. This suggests that the late hydrothermal history recorded by titanite petrochronology is focused within the stock margin and/or within different wallrocks (i.e., structurally higher carbonates).

ISBN: 9798357570437Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

Contact metamorphism

Isotopic, Geochemical, and Textural Constraints on the Timing, Duration, and Rates of Infiltration-Driven Contact Metamorphism Surrounding the Alta, Utah Stock.
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035 $a (MiAaPQ)AAI28967626
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040 $a MiAaPQ $c MiAaPQ
100 1 $a Beno, Carl Joseph. $3 3642073
245 1 0 $a Isotopic, Geochemical, and Textural Constraints on the Timing, Duration, and Rates of Infiltration-Driven Contact Metamorphism Surrounding the Alta, Utah Stock.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2022
300 $a 178 p.
500 $a Source: Dissertations Abstracts International, Volume: 84-05, Section: B.
500 $a Includes supplementary digital materials.
500 $a Advisor: Bowman, John R.
502 $a Thesis (Ph.D.)--The University of Utah, 2022.
506 $a This item must not be sold to any third party vendors.
520 $a In the following three chapters I present petrologic and geochemical evidence for the rapid metamorphism of siliceous carbonate strata driven by infiltration of reactive H2O-rich fluids during contact metamorphism associated with the protracted emplacement and construction of the Alta stock.Chapter 1 provides textural and geochemical evidence for the widespread development of skeletal forsterite crystals formed during infiltration-driven metamorphism in the Alta dolomites. Highly overstepped forsterite petrogenesis drives dendritic growth and is documented with single-crystal images and grain-scale trace element profiles. These data caution against the utilization of "core-to-rim" relative timing conventions when interpreting 2D geochemical or isotopic datasets.Chapter 2 summarizes the oxygen isotope measurements that were performed on a suite of rocks from the inner Alta aureole to constrain the grain-scale variation in d18O and to calculate mineral-mineral fractionation factors. I posit that the observed disequilibrium of calcite-forsterite pairs is either the result of kinetic effects occurring during forsterite petrogenesis, or post crystallization isotope exchange and continued depletion of the less refractory calcite during the initial stages of cooling/retrogradation. Detailed isotope work in coexisting calcite and forsterite from site 94I is combined with textural analysis to reveal asynchronous infiltration and metamorphism of two adjacent marble layers. These findings demonstrate the linkage between metamorphism and permeability development/destruction over the timescales of infiltration-driven metamorphism.Two distinct generations of dikes/sills crop out in the inner aureole; an older intermediate granodioritic phase, and a younger generation of leucocratic aplite/pegmatite. U-Pb dating results from zircon and monazite from the inner aureole are presented in Chapter 3. These data suggest the onset of emplacement began at ~36.5 Ma with the last batch of evolved magmas, represented by the leucocratic aplite/pegmatite dike/sills, being emplaced as late as ~29 Ma. These data are consistent with U-Pb constraints from the associated Alta stock, however, the protracted hydrothermal history recorded in the margin of the Alta stock (down to ~23 Ma) is not recorded by these rocks. This suggests that the late hydrothermal history recorded by titanite petrochronology is focused within the stock margin and/or within different wallrocks (i.e., structurally higher carbonates).
590 $a School code: 0240.
650 4 $a Geology. $3 516570
650 4 $a Petrology. $3 535210
650 4 $a Geochemistry. $3 539092
653 $a Contact metamorphism
653 $a Forsterite
653 $a Geochronology
653 $a Isotope geochemistry
690 $a 0372
690 $a 0996
690 $a 0584
710 2 $a The University of Utah. $b Geology and Geophysics. $3 2097684
773 0 $t Dissertations Abstracts International $g 84-05B.
790 $a 0240
791 $a Ph.D.
792 $a 2022
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28967626