Crustal growth by magmatic accretion constrained by metamorphic P-T paths and thermal models of the Kohistan arc, NW Himalayas

Takashi Yoshino, Takamoto Okudaira

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Magmatic accretion is potentially an important mechanism in the growth of the continental crust and the information of granulites. In this study, the thermal evolution of a magmatic arc in response to magmatic accretion is modeled using numerical solutions of the one-dimensional heat conduction equation. The initial and boundary conditions used in the model are constrained by geological observations made in the Kohistan area, NW Himalayas. Taking consideration of the preferred intrusion locations for basaltic magmas, we consider two plausible modes of magmatic accretion: The first involves the repeated intrusion of basalt at mid-crustal depths ('intraplate model'), and the second evaluates the simultaneous intrusion of basalt and picrite at mid-crustal depths and the base of the crust respectively ('double-plate model'). The results of the double-plate model account for both the inferred metamorphic P-T paths of the Kohistan mafic granulites and the continental geotherm determined from peak P-T conditions observed for granulite terranes. The double-plate model may be applicable as a key growth process for the production of thick mafic lower crust in magmatic arcs.

Original languageEnglish
Pages (from-to)2287-2302
Number of pages16
JournalJournal of Petrology
Volume45
Issue number11
DOIs
Publication statusPublished - Nov 2004

Fingerprint

Himalayas
arcs
accretion
intrusion
crusts
basalt
picrite
thermal evolution
P-T conditions
granulite
Heat conduction
conductive heat transfer
lower crust
continental crust
terrane
boundary condition
Hot Temperature
Boundary conditions
boundary conditions
crust

Keywords

  • Granulite
  • Lower crust
  • Magmatic underplating
  • P-T path
  • Thermal model

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Crustal growth by magmatic accretion constrained by metamorphic P-T paths and thermal models of the Kohistan arc, NW Himalayas. / Yoshino, Takashi; Okudaira, Takamoto.

In: Journal of Petrology, Vol. 45, No. 11, 11.2004, p. 2287-2302.

Research output: Contribution to journalArticle

@article{d0fde03536854f97a37e20465d9c0e6f,
title = "Crustal growth by magmatic accretion constrained by metamorphic P-T paths and thermal models of the Kohistan arc, NW Himalayas",
abstract = "Magmatic accretion is potentially an important mechanism in the growth of the continental crust and the information of granulites. In this study, the thermal evolution of a magmatic arc in response to magmatic accretion is modeled using numerical solutions of the one-dimensional heat conduction equation. The initial and boundary conditions used in the model are constrained by geological observations made in the Kohistan area, NW Himalayas. Taking consideration of the preferred intrusion locations for basaltic magmas, we consider two plausible modes of magmatic accretion: The first involves the repeated intrusion of basalt at mid-crustal depths ('intraplate model'), and the second evaluates the simultaneous intrusion of basalt and picrite at mid-crustal depths and the base of the crust respectively ('double-plate model'). The results of the double-plate model account for both the inferred metamorphic P-T paths of the Kohistan mafic granulites and the continental geotherm determined from peak P-T conditions observed for granulite terranes. The double-plate model may be applicable as a key growth process for the production of thick mafic lower crust in magmatic arcs.",
keywords = "Granulite, Lower crust, Magmatic underplating, P-T path, Thermal model",
author = "Takashi Yoshino and Takamoto Okudaira",
year = "2004",
month = "11",
doi = "10.1093/petrology/egh056",
language = "English",
volume = "45",
pages = "2287--2302",
journal = "Journal of Petrology",
issn = "0022-3530",
publisher = "Oxford University Press",
number = "11",

}

TY - JOUR

T1 - Crustal growth by magmatic accretion constrained by metamorphic P-T paths and thermal models of the Kohistan arc, NW Himalayas

AU - Yoshino, Takashi

AU - Okudaira, Takamoto

PY - 2004/11

Y1 - 2004/11

N2 - Magmatic accretion is potentially an important mechanism in the growth of the continental crust and the information of granulites. In this study, the thermal evolution of a magmatic arc in response to magmatic accretion is modeled using numerical solutions of the one-dimensional heat conduction equation. The initial and boundary conditions used in the model are constrained by geological observations made in the Kohistan area, NW Himalayas. Taking consideration of the preferred intrusion locations for basaltic magmas, we consider two plausible modes of magmatic accretion: The first involves the repeated intrusion of basalt at mid-crustal depths ('intraplate model'), and the second evaluates the simultaneous intrusion of basalt and picrite at mid-crustal depths and the base of the crust respectively ('double-plate model'). The results of the double-plate model account for both the inferred metamorphic P-T paths of the Kohistan mafic granulites and the continental geotherm determined from peak P-T conditions observed for granulite terranes. The double-plate model may be applicable as a key growth process for the production of thick mafic lower crust in magmatic arcs.

AB - Magmatic accretion is potentially an important mechanism in the growth of the continental crust and the information of granulites. In this study, the thermal evolution of a magmatic arc in response to magmatic accretion is modeled using numerical solutions of the one-dimensional heat conduction equation. The initial and boundary conditions used in the model are constrained by geological observations made in the Kohistan area, NW Himalayas. Taking consideration of the preferred intrusion locations for basaltic magmas, we consider two plausible modes of magmatic accretion: The first involves the repeated intrusion of basalt at mid-crustal depths ('intraplate model'), and the second evaluates the simultaneous intrusion of basalt and picrite at mid-crustal depths and the base of the crust respectively ('double-plate model'). The results of the double-plate model account for both the inferred metamorphic P-T paths of the Kohistan mafic granulites and the continental geotherm determined from peak P-T conditions observed for granulite terranes. The double-plate model may be applicable as a key growth process for the production of thick mafic lower crust in magmatic arcs.

KW - Granulite

KW - Lower crust

KW - Magmatic underplating

KW - P-T path

KW - Thermal model

UR - http://www.scopus.com/inward/record.url?scp=8644243048&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=8644243048&partnerID=8YFLogxK

U2 - 10.1093/petrology/egh056

DO - 10.1093/petrology/egh056

M3 - Article

AN - SCOPUS:8644243048

VL - 45

SP - 2287

EP - 2302

JO - Journal of Petrology

JF - Journal of Petrology

SN - 0022-3530

IS - 11

ER -