The sources of energy for crustal melting and the geochemistry of heat-producing elements

Беа, Ф.

doi:10.1016/j.lithos.2012.01.017

Cited by 158 publications

(88 citation statements)

References 71 publications

(77 reference statements)

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“…Bea, 2012). Consequently, partial melting, or the latent heat of fusion, results in a buffering of crustal temperatures (Bridgwater et al, 1974;O'Hara et al, 1978;Vielzeuf et al, 1990;Stüwe, 1995;Thompson and Connolly, 1995;Depine et al, 2008;Brown and Korhonen, 2009;Bea, 2012), such that temperature increases are impeded while major melt-producing reactions proceed. The absolute magnitude or extent of thermal buffering provided by partial melting reactions is a matter of some debate (e.g.…”

Section: Buffering Of Temperature By Partial Meltingmentioning

confidence: 99%

“…England and Thompson, 1984;Chamberlain and Sonder, 1990;Jamieson et al, 1998;Sandiford and Hand, 1998b;Kramers et al, 2001;Andreoli et al, 2006;Clark et al, 2011;Bea, 2012), elevated mantle heat flow (England and Thompson, 1984;Collins, 2002;Hyndman et al, 2005;Currie and Hyndman, 2006;Hyndman et al, 2009;Hyndman and Currie, 2011) and local or pervasive strain (viscous) heating (e.g. Kincaid and Silver, 1996;Stüwe, 1998;Burg and Gerya, 2005;Nabelek et al, 2010;Duretz et al, 2014).…”

Section: Heat Sources For Uht Metamorphismmentioning

confidence: 99%

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On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

Kelsey

Hand

2015

Geoscience Frontiers

371

285

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a b s t r a c tUltrahigh temperature (UHT) metamorphism is the most thermally extreme form of regional crustal metamorphism, with temperatures exceeding 900 C. UHT crustal metamorphism is recognised in more than 50 localities globally in the metamorphic rock record and is accepted as 'normal' in the spectrum of regional crustal processes. UHT metamorphism is typically identified on the basis of diagnostic mineral assemblages such as sapphirine þ quartz, orthopyroxene þ sillimanite AE quartz and osumilite in MgeAlrich rock compositions, now usually coupled with pseudosection-based thermobarometry using internally-consistent thermodynamic data sets and/or Al-in-Orthopyroxene and ternary feldspar thermobarometry. Significant progress in the understanding of regional UHT metamorphism in recent years includes: (1) development of a ferric iron activityecomposition thermodynamic model for sapphirine, allowing phase diagram calculations for oxidised rock compositions; (2) quantification of UHT conditions via trace element thermometry, with Zr-in-rutile more commonly recording higher temperatures than Ti-in-zircon. Rutile is likely to be stable at peak UHT conditions whereas zircon may only grow as UHT rocks are cooling. In addition, the extent to which Zr diffuses out of rutile is controlled by chemical communication with zircon; (3) more fully recognising and utilising temperature-dependent thermal properties of the crust, and the possible range of heat sources causing metamorphism in geodynamic modelling studies; (4) recognising that crust partially melted either in a previous event or earlier in a long-duration event has greater capacity than fertile, unmelted crust to achieve UHT conditions due to the heat energy consumed by partial melting reactions; (5) more strongly linking UePb geochronological data from zircon and monazite to PeT points or path segments through using Y þ REE partitioning between accessory and major phases, as well as phase diagrams incorporating Zr and REE; and (6) improved insight into the settings and factors responsible for UHT metamorphism via geodynamic forward models. These models suggest that regional UHT metamorphism is, principally, geodynamically related to subduction, coupled with elevated crustal radiogenic heat generation rates.Ó 2014, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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Section: Buffering Of Temperature By Partial Meltingmentioning

confidence: 99%

Section: Heat Sources For Uht Metamorphismmentioning

confidence: 99%

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

Kelsey

Hand

2015

Geoscience Frontiers

371

285

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“…Implications for the formation of highly radioactive granites and influence on enhanced geothermal system exploration A-type or anorogenic granites can have especially high concentrations of heatproducing elements if their parent melt derives from a metasomatised and previously enriched crustal source (Martin, 2006;Bea, 2012). Crustal enrichment results from multiple influxes of mantle-sourced, volatile-rich fluids.…”

Section: Gmi Ridgementioning

confidence: 99%

Chemical and mineralogical characterisation of illite–smectite: Implications for episodic tectonism and associated fluid flow, central Australia

Middleton

Uysal

Golding

2015

Geochimica et Cosmochimica Acta

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“…The hypotheses that support rather continuous magmatic activity are mainly derived from the combined interpretation of radiometric ages of granitoids obtained by different methods 40 Ar- 39 Ar, K-Ar; e.g., Serrano Pinto et al, 1987;Díaz Alvarado et al, 2013;Martínez Catalán et al, 2014) and the numerical modeling of the thermal evolution of the orogen, including radioactive heat production (e.g., Bea et al, 1999Bea et al, , 2003Bea, 2012;Alcock et al, 2015). In essence, these hypotheses view melt production in the collisional scenario mainly as the result of severe crustal thickening of a fertile (graywacke and pelite rich) crust followed by an interval of thermal relaxation (e.g., Martínez-Catalán et al, 2014) accompanied by melting of the thickened crust.…”

Section: Introductionmentioning

confidence: 99%

Exhuming a cold case: The early granodiorites of the northwest Iberian Variscan belt—A Visean magmatic flare-up?

et al. 2018

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In this study we report laser ablation-inductively coupled plasma-mass spectrometer U-Pb ages of granitoids from the so-called early granodiorites of the northwest Iberian Variscan belt. The U-Pb results attest to significant magmatic activity in Visean time (ca. 347-337 Ma) that generated a hitherto poorly constrained granitoid suite in the northwest Iberian tract of the western European Variscan belt realm. This early Carboniferous suite (ECS) is mainly composed of peraluminous cold and hot crustal granodiorites and monzogranites with minor associated mafic rocks that attest to minor involvement of mantle melting. Based on the geochronological and geochemical data, we compare the Visean granitoids with younger Variscan granitoids in northwest Iberia and, in view of the tectonothermal scenarios of the Variscan collision in northwest Iberia, propose a model for the genesis of the ECS in northwest Iberia that involves rapid melting upon fast exhumation of the thickened Gondwanan crust in the course of the protracted Variscan collision.

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The sources of energy for crustal melting and the geochemistry of heat-producing elements

Cited by 158 publications

References 71 publications

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

Chemical and mineralogical characterisation of illite–smectite: Implications for episodic tectonism and associated fluid flow, central Australia

Exhuming a cold case: The early granodiorites of the northwest Iberian Variscan belt—A Visean magmatic flare-up?

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