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Contact Metamorphism and Decarbonati...

Zhou, Zhenhao,

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Contact Metamorphism and Decarbonation in the Gangdese Arc: A Petrological, Geochemical, and Phase Equilibria Study /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Contact Metamorphism and Decarbonation in the Gangdese Arc: A Petrological, Geochemical, and Phase Equilibria Study // Zhenhao Zhou.
Author:	Zhou, Zhenhao,
Description:	1 electronic resource (172 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-10, Section: B.
Contained By:	Dissertations Abstracts International85-10B.
Subject:	Geology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30690414
ISBN:	9798382192925

Contact Metamorphism and Decarbonation in the Gangdese Arc: A Petrological, Geochemical, and Phase Equilibria Study /
Zhou, Zhenhao,

Contact Metamorphism and Decarbonation in the Gangdese Arc: A Petrological, Geochemical, and Phase Equilibria Study /Zhenhao Zhou. - 1 electronic resource (172 pages)

Source: Dissertations Abstracts International, Volume: 85-10, Section: B.

The potential correlation between long-term climate changes on Earth and the intensity of continental arcs, particularly their considerable CO2 emissions, implies considerable climatic impacts from these petro-tectonic processes. Contact metamorphism of sedimentary carbonates converts the country rocks into calcsilicate and releases substantial CO2. The widespread carbonate sequences deposited on major continental margins where arc activities culminated in the Cretaceous to Paleogene give rise to a hypothetical causal relationship between the magma-carbonate interaction and the Cretaceous Thermal Maximum. While isotopic and modeling evidence supports this hypothesis, direct field-based studies constraining the extents and rates of decarbonation would help assess aureole-scale CO2 fluxes.A wide range of lithology within contact aureoles, from calcsilicates to marble, in the Cretaceous Gangdese Arc in southern Tibet reveals distinctive behaviors of contact metamorphism. The first step to approach the question is the understanding of phase relations. Current phase diagrams detailing metacarbonate systems can be further refined to include additional components and minerals at lesser pressures. Metamorphic conditions such as pressure, temperature and the fluid composition can be estimated from the phase diagrams provided in this thesis. This thesis then presents comprehensive data obtained from the study of two exemplary endmember cases from the Lhasa terrane in southern Tibet.In the case of calcsilicate aureole, diffusion modeling across compositional zones within garnet and diopside suggests brief metamorphic alteration. As these calcsilicate samples demonstrate a large fraction of carbon loss, the corresponding carbon fluxes could be enormous, comparable to fluxes from other contemporary tectonic units. In contrast, studies on marble aureoles suggest fluid behaviors can vary according to rock rheology, thereby affecting the extent of carbon release. Thermobarometric and isotopic measurements from veins surrounded by recrystallized marble suggest that brittle carbonate country rock adjacent to short-lived intrusions facilitates rapid fluid migration and minimal decarbonation reactions. We speculate that, in comparison, ductile country rocks in the vicinity of long-lived intrusions seem to promote extensive fluid-rock interactions, leading to the creation of calcsilicate aureoles. Collectively, this thesis adds to our understanding of decarbonation processes through contact metamorphism from various perspectives, such as the duration and degree of decarbonation, fluid-rock interactions, and phase relations in metacarbonate rocks.

English

ISBN: 9798382192925Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

Carbon flux

Contact Metamorphism and Decarbonation in the Gangdese Arc: A Petrological, Geochemical, and Phase Equilibria Study /
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245 1 0 $a Contact Metamorphism and Decarbonation in the Gangdese Arc: A Petrological, Geochemical, and Phase Equilibria Study / $c Zhenhao Zhou.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2023
300 $a 1 electronic resource (172 pages)
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500 $a Source: Dissertations Abstracts International, Volume: 85-10, Section: B.
500 $a Includes supplementary digital materials.
500 $a Advisors: Chu, Xu Committee members: Anderson, Melissa O.; Gregory, Dan; Chu, Xu; Sio, Corliss K.
502 $b Ph.D. $c University of Toronto (Canada) $d 2023.
520 $a The potential correlation between long-term climate changes on Earth and the intensity of continental arcs, particularly their considerable CO2 emissions, implies considerable climatic impacts from these petro-tectonic processes. Contact metamorphism of sedimentary carbonates converts the country rocks into calcsilicate and releases substantial CO2. The widespread carbonate sequences deposited on major continental margins where arc activities culminated in the Cretaceous to Paleogene give rise to a hypothetical causal relationship between the magma-carbonate interaction and the Cretaceous Thermal Maximum. While isotopic and modeling evidence supports this hypothesis, direct field-based studies constraining the extents and rates of decarbonation would help assess aureole-scale CO2 fluxes.A wide range of lithology within contact aureoles, from calcsilicates to marble, in the Cretaceous Gangdese Arc in southern Tibet reveals distinctive behaviors of contact metamorphism. The first step to approach the question is the understanding of phase relations. Current phase diagrams detailing metacarbonate systems can be further refined to include additional components and minerals at lesser pressures. Metamorphic conditions such as pressure, temperature and the fluid composition can be estimated from the phase diagrams provided in this thesis. This thesis then presents comprehensive data obtained from the study of two exemplary endmember cases from the Lhasa terrane in southern Tibet.In the case of calcsilicate aureole, diffusion modeling across compositional zones within garnet and diopside suggests brief metamorphic alteration. As these calcsilicate samples demonstrate a large fraction of carbon loss, the corresponding carbon fluxes could be enormous, comparable to fluxes from other contemporary tectonic units. In contrast, studies on marble aureoles suggest fluid behaviors can vary according to rock rheology, thereby affecting the extent of carbon release. Thermobarometric and isotopic measurements from veins surrounded by recrystallized marble suggest that brittle carbonate country rock adjacent to short-lived intrusions facilitates rapid fluid migration and minimal decarbonation reactions. We speculate that, in comparison, ductile country rocks in the vicinity of long-lived intrusions seem to promote extensive fluid-rock interactions, leading to the creation of calcsilicate aureoles. Collectively, this thesis adds to our understanding of decarbonation processes through contact metamorphism from various perspectives, such as the duration and degree of decarbonation, fluid-rock interactions, and phase relations in metacarbonate rocks.
546 $a English
590 $a School code: 0779
650 4 $a Geology. $3 516570
650 4 $a Petrology. $3 535210
650 4 $a Geochemistry. $3 539092
653 $a Carbon flux
653 $a Contact metamorphism
653 $a Decarbonation
653 $a Phase equilibria modeling
653 $a Southern Tibet
690 $a 0372
690 $a 0584
690 $a 0996
710 2 $a University of Toronto (Canada). $b Earth Sciences. $e degree granting institution. $3 3814490
720 1 $a Chu, Xu $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 85-10B.
790 $a 0779
791 $a Ph.D.
792 $a 2023
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30690414