東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Petrologic Thermodynamic and Diffusi...

Chen, Junxing,

FindBook

Google Book

Amazon

博客來

Petrologic Thermodynamic and Diffusion Kinetic Modeling: Applications to Venus and the Western Tianshan Metamorphic Belt, China /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Petrologic Thermodynamic and Diffusion Kinetic Modeling: Applications to Venus and the Western Tianshan Metamorphic Belt, China // Junxing Chen.
作者:	Chen, Junxing,
面頁冊數:	1 electronic resource (146 pages)
附註:	Source: Dissertations Abstracts International, Volume: 85-05, Section: B.
Contained By:	Dissertations Abstracts International85-05B.
標題:	Geology. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30686941
ISBN:	9798380842440

Petrologic Thermodynamic and Diffusion Kinetic Modeling: Applications to Venus and the Western Tianshan Metamorphic Belt, China /
Chen, Junxing,

Petrologic Thermodynamic and Diffusion Kinetic Modeling: Applications to Venus and the Western Tianshan Metamorphic Belt, China /Junxing Chen. - 1 electronic resource (146 pages)

Source: Dissertations Abstracts International, Volume: 85-05, Section: B.

Slab subduction plays an essential role in plate tectonics and Earth's geological evolution. While conventional petrologic and thermodynamic modeling derive valuable P-T information from exhumed high-pressure terranes, assessing rates or timescales adds a new dynamic perspective on subduction processes. Recent studies, through calibrated diffusion models for minerals, have successfully formulated comprehensive P-T-t paths using diffusion speedometry. However, the intricate mathematics involved underscores the need for accessible and adaptable software, leading to the creation of DIFFUSUP, a user-friendly diffusion simulation tool introduced in this Ph.D. thesis.Garnet is a prevalent mineral in metamorphic rocks. The diffusion of divalent cations (Ca2+, Mg2+, Fe2+, Mn2+) in garnet is widely used for resolving transient geological events in diverse contexts. However, the available models have demonstrated inconsistencies, especially at low temperatures. This thesis then recalibrates the garnet diffusion model, focusing on Mn2+, utilizing samples from the Western Tianshan ultrahigh-pressure metamorphic belt. This recalibrated model, when applied to an eclogitic breccia, unveils a transient thermal phase during slab exhumation.For carbonate minerals, the existing diffusion models for Mg2+-Fe2+/Mn2+ in dolomite need re-evaluation due to notable disparities between model predictions and empirical observations. Through high-pressure experiments and natural sample examination, this research shows that the diffusion rates are considerably slower than previous insights from experiments, setting new upper limits at a series of temperatures. Such findings emphasize the critical role of spatial resolution of analytical methods in diffusion modeling.Beyond diffusion speedometry, an analysis of the physical properties of subduction slabs offers valuable insights into subduction geodynamics and broader consequences. The final chapter compares the buoyancy of subducting slabs on Archean Earth with Venus. Based on 2D thermo-metamorphic modeling, the results shed light on how the variation in eclogitization influences slab buoyancy on these two planets. The greater chemical buoyancy on Venus, posing resistance to subduction, may have hindered its transition to self-sustained subduction.

English

ISBN: 9798380842440Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

Diffusion

Petrologic Thermodynamic and Diffusion Kinetic Modeling: Applications to Venus and the Western Tianshan Metamorphic Belt, China /
LDR:03804nmm a22004333i 4500 001 2427566
005 20260911085204.5
006 m o d
007 cr|nu|||||||||
008 260929s2023 miu||||||m |||||||eng d
020 $a 9798380842440
035 $a (MiAaPQD)AAI30686941
035 $a AAI30686941
040 $a MiAaPQD $b eng $c MiAaPQD $e rda
100 1 $a Chen, Junxing, $e author. $0 (orcid)0000-0002-5079-9522 $3 3814489
245 1 0 $a Petrologic Thermodynamic and Diffusion Kinetic Modeling: Applications to Venus and the Western Tianshan Metamorphic Belt, China / $c Junxing Chen.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2023
300 $a 1 electronic resource (146 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: 85-05, Section: B.
500 $a Advisors: Chu, Xu Committee members: Sio, Corliss Kin I; Gregory, Dan; Yakymchuk, Chris; Pysklywec, Russell; Bennett, Neil.
502 $b Ph.D. $c University of Toronto (Canada) $d 2023.
520 $a Slab subduction plays an essential role in plate tectonics and Earth's geological evolution. While conventional petrologic and thermodynamic modeling derive valuable P-T information from exhumed high-pressure terranes, assessing rates or timescales adds a new dynamic perspective on subduction processes. Recent studies, through calibrated diffusion models for minerals, have successfully formulated comprehensive P-T-t paths using diffusion speedometry. However, the intricate mathematics involved underscores the need for accessible and adaptable software, leading to the creation of DIFFUSUP, a user-friendly diffusion simulation tool introduced in this Ph.D. thesis.Garnet is a prevalent mineral in metamorphic rocks. The diffusion of divalent cations (Ca2+, Mg2+, Fe2+, Mn2+) in garnet is widely used for resolving transient geological events in diverse contexts. However, the available models have demonstrated inconsistencies, especially at low temperatures. This thesis then recalibrates the garnet diffusion model, focusing on Mn2+, utilizing samples from the Western Tianshan ultrahigh-pressure metamorphic belt. This recalibrated model, when applied to an eclogitic breccia, unveils a transient thermal phase during slab exhumation.For carbonate minerals, the existing diffusion models for Mg2+-Fe2+/Mn2+ in dolomite need re-evaluation due to notable disparities between model predictions and empirical observations. Through high-pressure experiments and natural sample examination, this research shows that the diffusion rates are considerably slower than previous insights from experiments, setting new upper limits at a series of temperatures. Such findings emphasize the critical role of spatial resolution of analytical methods in diffusion modeling.Beyond diffusion speedometry, an analysis of the physical properties of subduction slabs offers valuable insights into subduction geodynamics and broader consequences. The final chapter compares the buoyancy of subducting slabs on Archean Earth with Venus. Based on 2D thermo-metamorphic modeling, the results shed light on how the variation in eclogitization influences slab buoyancy on these two planets. The greater chemical buoyancy on Venus, posing resistance to subduction, may have hindered its transition to self-sustained subduction.
546 $a English
590 $a School code: 0779
650 4 $a Geology. $3 516570
650 4 $a Thermodynamics. $3 517304
650 4 $a Petrology. $3 535210
653 $a Diffusion
653 $a Eclogite
653 $a Garnet
653 $a Petrologic modeling
653 $a Subduction
690 $a 0372
690 $a 0348
690 $a 0584
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 85-05B.
790 $a 0779
791 $a Ph.D.
792 $a 2023
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30686941