A clinopyroxene-basalt geothermobarometry perspective of Columbia Plateau (NW-USA) Miocene magmatism

Caprarelli, G; Reidel, SP

A clinopyroxene-basalt geothermobarometry perspective of Columbia Plateau (NW-USA) Miocene magmatism

Caprarelli, G

Reidel, SP

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Publication Type:: Journal Article
Citation:: Terra Nova, 2005, 17 (3), pp. 265 - 277
Issue Date:: 2005-06-01

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Field	Value	Language
dc.contributor.author	Caprarelli, G https://orcid.org/0000-0001-9578-3228	en_US
dc.contributor.author	Reidel, SP	en_US
dc.date.issued	2005-06-01	en_US
dc.identifier.citation	Terra Nova, 2005, 17 (3), pp. 265 - 277	en_US
dc.identifier.issn	0954-4879	en_US
dc.identifier.uri	http://hdl.handle.net/10453/676
dc.description.abstract	The origin of NW-USA Columbia River Basalt Group Miocene magmatism and its relation to tectonism has been widely debated and is still open to study. We investigated the pre-eruptive evolution of the magmas, to constrain pressures and temperatures of the ascending magmas, and plumbing conditions. We determined major element concentrations of 17-6 Ma tholeiites, and applied clinopyroxene - liquid geothermobarometry to calculate pre-eruptive pressures and temperatures. These ranged from 0 to 0.66 GPa and 1120 to 1222 °C, respectively, defining two age-related parallel trends in a P-T diagram. This indicates a consistent crustal evolution of the magmas, and records at least two distinct initial temperatures. Using clinopyroxene interdiffusion coefficients we estimated magma ascent speeds ≥ 0.6 km yr-1. Possible geological explanations for the calculated parameters are: lower-crust magma chamber processes; magmatism amd tectonism feedback consistent with an extensional environment. © 2005 Blackwell Publishing Ltd.	en_US
dc.relation.ispartof	Terra Nova	en_US
dc.relation.isbasedon	10.1111/j.1365-3121.2005.00611.x	en_US
dc.subject.classification	Geochemistry & Geophysics	en_US
dc.title	A clinopyroxene-basalt geothermobarometry perspective of Columbia Plateau (NW-USA) Miocene magmatism	en_US
dc.type	Journal Article
utslib.citation.volume	3	en_US
utslib.citation.volume	17	en_US
utslib.for	040304 Igneous and Metamorphic Petrology	en_US
utslib.for	040314 Volcanology	en_US
utslib.for	04 Earth Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	closed_access
pubs.issue	3	en_US
pubs.publication-status	Published	en_US
pubs.volume	17	en_US

Abstract:

The origin of NW-USA Columbia River Basalt Group Miocene magmatism and its relation to tectonism has been widely debated and is still open to study. We investigated the pre-eruptive evolution of the magmas, to constrain pressures and temperatures of the ascending magmas, and plumbing conditions. We determined major element concentrations of 17-6 Ma tholeiites, and applied clinopyroxene - liquid geothermobarometry to calculate pre-eruptive pressures and temperatures. These ranged from 0 to 0.66 GPa and 1120 to 1222 °C, respectively, defining two age-related parallel trends in a P-T diagram. This indicates a consistent crustal evolution of the magmas, and records at least two distinct initial temperatures. Using clinopyroxene interdiffusion coefficients we estimated magma ascent speeds ≥ 0.6 km yr-1. Possible geological explanations for the calculated parameters are: lower-crust magma chamber processes; magmatism amd tectonism feedback consistent with an extensional environment. © 2005 Blackwell Publishing Ltd.

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http://hdl.handle.net/10453/676