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Evaluating Subduction Zone Processes...

Brigham, John Mark,

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Evaluating Subduction Zone Processes in Early Paleozoic Rocks of the Northern Appalachian Orogen /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Evaluating Subduction Zone Processes in Early Paleozoic Rocks of the Northern Appalachian Orogen // John Mark Brigham.
作者:	Brigham, John Mark,
面頁冊數:	1 electronic resource (177 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-12, Section: A.
Contained By:	Dissertations Abstracts International86-12A.
標題:	Geology. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31931706
ISBN:	9798280784598

Evaluating Subduction Zone Processes in Early Paleozoic Rocks of the Northern Appalachian Orogen /
Brigham, John Mark,

Evaluating Subduction Zone Processes in Early Paleozoic Rocks of the Northern Appalachian Orogen /John Mark Brigham. - 1 electronic resource (177 pages)

Source: Dissertations Abstracts International, Volume: 86-12, Section: A.

The study of rocks presently exposed at the surface in mountain ranges such as the Appalachian Mountains can offer insight into the evolution of orogenic and subduction zone processes over geologic time. To better understand the timing, conditions (i.e., pressure and temperature), and tectonic setting of mineral formation in former subduction settings, geologists conduct geochronology, geochemistry, and thermobarometry analyses on rocks and minerals in paleo-subduction zones.This dissertation contains three chapters that focus on serpentinization, hydrothermal alteration of mafic rocks during serpentinization (rodingitization), and high-pressure metamorphism that occurred in a subduction setting during the first phase of the Appalachian Orogeny. The first chapter uses Sm-Nd garnet geochronology to establish the timing of rodingitization and serpentinization in the northern Appalachian Mountains. The results show that multiple generations of garnet occur in serpentinite-hosted rodingites from Belvidere Mountain, Vermont. The oldest garnets formed in a subduction setting during the Taconic Orogeny (477.3±6.1 Ma) and provide a minimum estimate for the timing of serpentinization. The youngest garnets formed 70 My later in veins from low-temperature metasomatism and fluid circulation during the Salinic Orogeny (410.0±4.0 Ma). The first chapter demonstrates that Sm-Nd geochronology can successfully constrain the petrologic evolution of rodingites despite the effects of polymetamorphism and a ~70 My hiatus between different generations of garnet growth. The second chapter uses mineral and whole-rock geochemical analyses to constrain the fluid source and tectonic setting for serpentinization during the Taconic Orogeny. The serpentinites are enriched in slab-derived, fluid-mobile elements (e.g., As, Cs, and Sb) but depleted in elements such as U and Th, which are commonly enriched in seafloor.

English

ISBN: 9798280784598Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

Eclogite facies

Evaluating Subduction Zone Processes in Early Paleozoic Rocks of the Northern Appalachian Orogen /
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520 $a The study of rocks presently exposed at the surface in mountain ranges such as the Appalachian Mountains can offer insight into the evolution of orogenic and subduction zone processes over geologic time. To better understand the timing, conditions (i.e., pressure and temperature), and tectonic setting of mineral formation in former subduction settings, geologists conduct geochronology, geochemistry, and thermobarometry analyses on rocks and minerals in paleo-subduction zones.This dissertation contains three chapters that focus on serpentinization, hydrothermal alteration of mafic rocks during serpentinization (rodingitization), and high-pressure metamorphism that occurred in a subduction setting during the first phase of the Appalachian Orogeny. The first chapter uses Sm-Nd garnet geochronology to establish the timing of rodingitization and serpentinization in the northern Appalachian Mountains. The results show that multiple generations of garnet occur in serpentinite-hosted rodingites from Belvidere Mountain, Vermont. The oldest garnets formed in a subduction setting during the Taconic Orogeny (477.3±6.1 Ma) and provide a minimum estimate for the timing of serpentinization. The youngest garnets formed 70 My later in veins from low-temperature metasomatism and fluid circulation during the Salinic Orogeny (410.0±4.0 Ma). The first chapter demonstrates that Sm-Nd geochronology can successfully constrain the petrologic evolution of rodingites despite the effects of polymetamorphism and a ~70 My hiatus between different generations of garnet growth. The second chapter uses mineral and whole-rock geochemical analyses to constrain the fluid source and tectonic setting for serpentinization during the Taconic Orogeny. The serpentinites are enriched in slab-derived, fluid-mobile elements (e.g., As, Cs, and Sb) but depleted in elements such as U and Th, which are commonly enriched in seafloor.
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653 $a Mantle wedge
653 $a Rodingites
653 $a Serpentinite
653 $a Subduction
653 $a Taconic Orogeny
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