Insights into the Compositional Evolution of Crustal Magmatic Systems from Coupled Petrological-Geodynamical Models

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Autoren
  • Lisa Rummel
  • Boris JP Kaus
  • Tobias S Baumann
  • Richard W White
  • Nicolas Riel
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000593094800004&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.1093/petrology/egaa029
eISSN
1460-2415
Externe Identifier
  • Clarivate Analytics Document Solution ID: OW7XO
ISSN
0022-3530
Ausgabe der Veröffentlichung
2
Zeitschrift
JOURNAL OF PETROLOGY
Schlüsselwörter
  • coupled petrological-geodynamical models
  • depletion of rocks through diking
  • highly evolved rocks
  • large phase diagram database
  • long-lived mush chambers
Artikelnummer
ARTN egaa029
Datum der Veröffentlichung
2020
Status
Published
Titel
Insights into the Compositional Evolution of Crustal Magmatic Systems from Coupled Petrological-Geodynamical Models
Sub types
  • Article
Ausgabe der Zeitschrift
61

Datenquelle: Web of Science (Lite)

Andere Metadatenquellen:
Abstract
<jats:title>Abstract</jats:title><jats:p>The evolution of crustal magmatic systems is incompletely understood, as most studies are limited either by their temporal or spatial resolution. Exposed plutonic rocks represent the final stage of a long-term evolution punctuated by several magmatic events with different chemistry and generated under different mechanical conditions. Although the final state can be easily described, the nature of each magmatic pulse is more difficult to retrieve. This study presents a new method to investigate the compositional evolution of plutonic systems while considering thermal and mechanical processes. A thermomechanical code (MVEP2) extended by a semi-analytical dike/sill formation algorithm, is combined with a thermodynamic modelling approach (Perple_X) to investigate the feedback between petrology and mechanics. Melt is extracted to form dikes while depleting the source region. The evolving rock compositions are tracked on markers using a different phase diagram for each discrete bulk-rock composition. The rock compositional evolution is thus tracked with a high precision by means of a database with more than 58 000 phase diagrams. This database describes how density, melt fraction, chemical composition of melt and solid fractions and mineralogical assemblages change over crustal to uppermost mantle P–T conditions for a large range of rock compositions. Each bulk rock composition is composed of the 10 major oxides (SiO2–TiO2–Al2O3–Cr2O3–MgO–FeO–CaO–Na2O–K2O–H2O) including an oxygen buffer. The combined modelling approach is applied to study the chemical evolution of the crust during arc magmatism and related melt extraction and magma mixing processes. Basaltic sills are periodically injected into the crust to model heat/magma influx from the mantle. We find that accumulated sills turn into long-lived mush chambers when using a lower rock cohesion or assuming a higher intrusion depth. Associated partial melting of crustal host rocks occurs around densely distributed dikes and sills. High silica rocks (e.g. granites) are generated by partial melting of the host rocks, melt segregation within dikes, and from fractional crystallization of basalts. Although the volume of these rocks is relatively small in our models compared to rocks with a mafic to intermediate composition, they provide important information about the processes of magma differentiation within arc continental crust.</jats:p>
Autoren
  • Lisa Rummel
  • Boris JP Kaus
  • Tobias S Baumann
  • Richard W White
  • Nicolas Riel
DOI
10.1093/petrology/egaa029
eISSN
1460-2415
ISSN
0022-3530
Ausgabe der Veröffentlichung
2
Zeitschrift
Journal of Petrology
Sprache
en
Online publication date
2020
Datum der Veröffentlichung
2020
Status
Published
Herausgeber
Oxford University Press (OUP)
Herausgeber URL
http://dx.doi.org/10.1093/petrology/egaa029
Datum der Datenerfassung
2022
Titel
Insights into the Compositional Evolution of Crustal Magmatic Systems from Coupled Petrological-Geodynamical Models
Ausgabe der Zeitschrift
61

Datenquelle: Crossref

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