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Detailed Fluid Records from Metamorp...

Roig González, Claudia I.,

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Detailed Fluid Records from Metamorphic Core Complexes /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Detailed Fluid Records from Metamorphic Core Complexes // Claudia I Roig González.
作者:	Roig González, Claudia I.,
面頁冊數:	1 electronic resource (187 pages)
附註:	Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
Contained By:	Dissertations Abstracts International85-11B.
標題:	Geochemistry. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31298042
ISBN:	9798382596341

Detailed Fluid Records from Metamorphic Core Complexes /
Roig González, Claudia I.,

Detailed Fluid Records from Metamorphic Core Complexes /Claudia I Roig González. - 1 electronic resource (187 pages)

Source: Dissertations Abstracts International, Volume: 85-11, Section: B.

Extensional detachment fault systems of metamorphic core complexes (MCC) have the potential to facilitate significant fluid movement between Earth's surface and the ductile middle crust. Oxygen isotopes have long been recognized as potential tracers of surface-to-depth fluid flow in MCCs; however, typical sampling methods and the competing effects between temperature and fluid composition have made oxygen isotope signatures of meteoric fluid infiltration difficult to detect and/or interpret in the MCC rock record. This dissertation develops in situ secondary ion mass spectrometry (SIMS) δ18O analysis as a tool to investigate fluid-rock interactions in MCC mylonites at a new and unprecedented level of detail.Chapter 1 investigates the rock record of meteoric fluid interactions and temperature variation within the Whipple Mountains MCC footwall beneath the Whipple detachment fault (WDF) using SIMS δ18O measurements in quartz and epidote. SIMS data reveal that quartz and epidote show increasing spread toward low δ18O values approaching the WDF, and that meteoric fluid-rock interactions were spatially heterogeneous at the scale of individual grains. SIMS δ18O data do not support a large paleo-thermal gradient beneath the WDF, as proposed in the "footwall refrigeration" hypothesis of Morisson and Anderson (1998).Chapter 2 details a multi-analytical approach to develop matrix-matched reference materials to calibrate SIMS δ18O bias resulting from Al-Fe3+solid solution in epidote group minerals. This study shows that SIMS bias increases linearly for 0 ≤ XEp ≤ 0.7 but decreases for XEp ≥ 0.7. The epidote structure undergoes an order-disorder transition as Fe increasingly partitions into both M3 and M1 sites. The associated changes in bonding structure likely affect SIMS sputtering-ionization interactions and thus SIMS bias. Consequently, a piece-wise calibration of the SIMS bias vs. Xep trend with different linear fit segments for Xep = 0.3-0.8 and Xep = 0.8-1.0 is proposed.Chapter 3 reports in situ SIMS δ18O measurements in feldspar porphyroclasts with multiple crosscutting brittle and ductile deformation microstructures. Feldspars immediately below the WDF record pervasively low, oscillating δ18O values and a sequence of brittle-to-plastic-to-brittle deformation microstructures. Feldspar porphyroclasts deeper below the WDF record brittle-to-plastic deformation microstructures, with low-δ18O values associated only with ductile microstructures. These observations suggest that infiltration of low-δ18O fluids was facilitated by brittle microfracturing and promoted ductile deformation in the WDF footwall but that brittle behavior recurred near the main detachment surface, likely due to transient changes in strain rate or fluid pressure.

English

ISBN: 9798382596341Subjects--Topical Terms:

539092
Geochemistry.
Subjects--Index Terms:

Fluid movement

Detailed Fluid Records from Metamorphic Core Complexes /
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245 1 0 $a Detailed Fluid Records from Metamorphic Core Complexes / $c Claudia I Roig González.
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500 $a Includes supplementary digital materials.
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502 $b Ph.D. $c The University of Wisconsin - Madison $d 2024.
520 $a Extensional detachment fault systems of metamorphic core complexes (MCC) have the potential to facilitate significant fluid movement between Earth's surface and the ductile middle crust. Oxygen isotopes have long been recognized as potential tracers of surface-to-depth fluid flow in MCCs; however, typical sampling methods and the competing effects between temperature and fluid composition have made oxygen isotope signatures of meteoric fluid infiltration difficult to detect and/or interpret in the MCC rock record. This dissertation develops in situ secondary ion mass spectrometry (SIMS) δ18O analysis as a tool to investigate fluid-rock interactions in MCC mylonites at a new and unprecedented level of detail.Chapter 1 investigates the rock record of meteoric fluid interactions and temperature variation within the Whipple Mountains MCC footwall beneath the Whipple detachment fault (WDF) using SIMS δ18O measurements in quartz and epidote. SIMS data reveal that quartz and epidote show increasing spread toward low δ18O values approaching the WDF, and that meteoric fluid-rock interactions were spatially heterogeneous at the scale of individual grains. SIMS δ18O data do not support a large paleo-thermal gradient beneath the WDF, as proposed in the "footwall refrigeration" hypothesis of Morisson and Anderson (1998).Chapter 2 details a multi-analytical approach to develop matrix-matched reference materials to calibrate SIMS δ18O bias resulting from Al-Fe3+solid solution in epidote group minerals. This study shows that SIMS bias increases linearly for 0 ≤ XEp ≤ 0.7 but decreases for XEp ≥ 0.7. The epidote structure undergoes an order-disorder transition as Fe increasingly partitions into both M3 and M1 sites. The associated changes in bonding structure likely affect SIMS sputtering-ionization interactions and thus SIMS bias. Consequently, a piece-wise calibration of the SIMS bias vs. Xep trend with different linear fit segments for Xep = 0.3-0.8 and Xep = 0.8-1.0 is proposed.Chapter 3 reports in situ SIMS δ18O measurements in feldspar porphyroclasts with multiple crosscutting brittle and ductile deformation microstructures. Feldspars immediately below the WDF record pervasively low, oscillating δ18O values and a sequence of brittle-to-plastic-to-brittle deformation microstructures. Feldspar porphyroclasts deeper below the WDF record brittle-to-plastic deformation microstructures, with low-δ18O values associated only with ductile microstructures. These observations suggest that infiltration of low-δ18O fluids was facilitated by brittle microfracturing and promoted ductile deformation in the WDF footwall but that brittle behavior recurred near the main detachment surface, likely due to transient changes in strain rate or fluid pressure.
546 $a English
590 $a School code: 0262
650 4 $a Geochemistry. $3 539092
650 4 $a Petrology. $3 535210
650 4 $a Fluid mechanics. $3 528155
650 4 $a Geology. $3 516570
653 $a Fluid movement
653 $a Metamorphic core complexes
653 $a Secondary ion mass spectrometry
653 $a Porphyroclasts
653 $a Meteoric fluid infiltration
690 $a 0996
690 $a 0584
690 $a 0204
690 $a 0372
710 2 $a The University of Wisconsin - Madison. $b Geoscience. $e degree granting institution. $3 3814503
720 1 $a Bonamici, Chloë $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 85-11B.
790 $a 0262
791 $a Ph.D.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31298042