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Records of Fluid-Rock Interaction in...

Raia, Natalie Hope,

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Records of Fluid-Rock Interaction in an Oceanic Subduction Complex /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Records of Fluid-Rock Interaction in an Oceanic Subduction Complex // Natalie Hope Raia.
Author:	Raia, Natalie Hope,
Description:	1 electronic resource (251 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-02, Section: B.
Contained By:	Dissertations Abstracts International86-02B.
Subject:	Geology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30575027
ISBN:	9798384009566

Records of Fluid-Rock Interaction in an Oceanic Subduction Complex /
Raia, Natalie Hope,

Records of Fluid-Rock Interaction in an Oceanic Subduction Complex /Natalie Hope Raia. - 1 electronic resource (251 pages)

Source: Dissertations Abstracts International, Volume: 86-02, Section: B.

The recycling of tectonic plates at subduction zones plays a vital role in maintaining Earth's tectonic organization and magmatic systems over geologic time. The progressive release of aqueous fluids from subducting lithosphere is a significant Earth process: it provides a mechanism for mass transfer between recycled lithosphere and the overlying mantle, causes rheological changes in the residual plate, influences styles and locations of seismicity, and is responsible for the generation of arc volcanoes and the creation of continents, for instance. Globally, subduction complexes provide the primary material record for studying fluid-related processes at depth and represent critical grounding sites for informing numeric models and seismic imaging of active subduction zones.The island of New Caledonia exposes one such complex, and the locality is well-known for its exceptional preservation of lawsonite blueschist- through eclogite-facies rocks. It has been used as a case study locality to investigate mass transfer between the slab and mantle, and the production of high-pressure vein systems, which reveal insights into intra-slab plumbing systems and physical devolatilization processes. This dissertation contributes to knowledge of the fluid history of this complex, presenting directed studies of its most hydrous rocks: serpentinites (Ch. 2) and "hybrid" rocks (chlorite and talc schists, Ch. 3). We examine their composition, textures, and spatial distribution, and integrate our findings within a study that refines the tectonostratigraphic distribution of lithologic components in the complex (Ch. 4).Our work reveals the existence of hydrated mantle from the downgoing plate and overriding mantle, identifying New Caledonia as a rare locality that preserves evidence for exhumation of both types of mantle. Examination of Fe-Ti oxides and accessory apatite in hybrid rocks reveals at least two stages and conditions of growth for oxides, and low-temperature thermochronology of the same minerals places new temperature-time constraints on a previously unstudied portion of the complex's exhumation history. Finally, results of integrated mapping underscore the existence of hydrated shear zones within the complex, proposing an intimate link between the location and type of serpentinites, the formation of hybrid rocks, the channelization of fluids, and the mechanisms that juxtaposed distinct tectonic units and facilitated exhumation of these deeply subducted rocks.

English

ISBN: 9798384009566Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

Blueschist

Records of Fluid-Rock Interaction in an Oceanic Subduction Complex /
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100 1 $a Raia, Natalie Hope, $e author. $3 3814478
245 1 0 $a Records of Fluid-Rock Interaction in an Oceanic Subduction Complex / $c Natalie Hope Raia.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2023
300 $a 1 electronic resource (251 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 86-02, Section: B.
500 $a Advisors: Whitney, Donna L.; Teyssier, Christian Committee members: Zheng, Xinyuan; Wada, Ikuko.
502 $b Ph.D. $c University of Minnesota $d 2023.
520 $a The recycling of tectonic plates at subduction zones plays a vital role in maintaining Earth's tectonic organization and magmatic systems over geologic time. The progressive release of aqueous fluids from subducting lithosphere is a significant Earth process: it provides a mechanism for mass transfer between recycled lithosphere and the overlying mantle, causes rheological changes in the residual plate, influences styles and locations of seismicity, and is responsible for the generation of arc volcanoes and the creation of continents, for instance. Globally, subduction complexes provide the primary material record for studying fluid-related processes at depth and represent critical grounding sites for informing numeric models and seismic imaging of active subduction zones.The island of New Caledonia exposes one such complex, and the locality is well-known for its exceptional preservation of lawsonite blueschist- through eclogite-facies rocks. It has been used as a case study locality to investigate mass transfer between the slab and mantle, and the production of high-pressure vein systems, which reveal insights into intra-slab plumbing systems and physical devolatilization processes. This dissertation contributes to knowledge of the fluid history of this complex, presenting directed studies of its most hydrous rocks: serpentinites (Ch. 2) and "hybrid" rocks (chlorite and talc schists, Ch. 3). We examine their composition, textures, and spatial distribution, and integrate our findings within a study that refines the tectonostratigraphic distribution of lithologic components in the complex (Ch. 4).Our work reveals the existence of hydrated mantle from the downgoing plate and overriding mantle, identifying New Caledonia as a rare locality that preserves evidence for exhumation of both types of mantle. Examination of Fe-Ti oxides and accessory apatite in hybrid rocks reveals at least two stages and conditions of growth for oxides, and low-temperature thermochronology of the same minerals places new temperature-time constraints on a previously unstudied portion of the complex's exhumation history. Finally, results of integrated mapping underscore the existence of hydrated shear zones within the complex, proposing an intimate link between the location and type of serpentinites, the formation of hybrid rocks, the channelization of fluids, and the mechanisms that juxtaposed distinct tectonic units and facilitated exhumation of these deeply subducted rocks.
546 $a English
590 $a School code: 0130
650 4 $a Geology. $3 516570
650 4 $a Aquatic sciences. $3 3174300
650 4 $a Chemical oceanography. $3 516760
653 $a Blueschist
653 $a Eclogite
653 $a Exhumation
653 $a Metamorphism
653 $a Subduction
653 $a Seismicity
690 $a 0372
690 $a 0403
690 $a 0792
710 2 $a University of Minnesota. $b Earth Sciences. $e degree granting institution. $3 3814479
720 1 $a Whitney, Donna L. $e degree supervisor.
720 1 $a Teyssier, Christian $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-02B.
790 $a 0130
791 $a Ph.D.
792 $a 2023
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30575027