55 million years of continuous anatexis in Central Iberia: single-zircon dating of the Peña Negra Complex

Montero, P.; Беа, Ф.; Zinger, T. F.; Scarrow, Jane H.; Molina, J.F.; Whitehouse, Martin J.

doi:10.1144/0016-764903-024

Cited by 51 publications

(32 citation statements)

References 16 publications

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“…7) suggest that the M 3 melting was rather long-lived (> 20 Ma), but did not result in the formation of large granitic bodies; melt remained confined to migmatites and was rarely extracted and transferred into true plutons. A similar pattern has been described in other segments of the Variscan belt, such as Central Spain (Montero et al 2004) or Calabria (Schenk 1990;Graessner et al 2000), suggesting that this process occurred throughout the whole Variscan belt. The M 3 and M 4 events, therefore, were very distinct.…”

Section: Long-lived Crustal Melting and Catastrophic Granite Productionsupporting

confidence: 82%

Temporal relationships between Mg-K mafic magmatism and catastrophic melting of the Variscan crust in the southern part of Velay Complex (Massif Central, France)

Couzinié¹,

Moyen²,

Villaros³

et al. 2014

Jour. Geosci.

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Mg-K mafic intrusive rocks are commonly observed during the late stages of the evolution of orogenic belts. The Variscan French Massif Central has many outcrops of these rocks, locally called vaugnerites. Such magmas have a mantle-derived origin and therefore allow discussion of the role of mantle melting and crust-mantle interactions during late-orogenic processes. In the Southern Velay area of the French Massif Central, LA-ICPMS U-Pb dating on zircons and monazites from three vaugnerites and four coeval granites reveals that the two igneous suites formed simultaneously, at c. 305 Ma. This major igneous event followed after an early, protracted melting stage that lasted for 20-30 My and generated migmatites, but the melt was not extracted efficiently and therefore no granite plutons were formed. This demonstrates that widespread crustal anatexis, melt extraction and granite production were synchronous with the intrusion of vaugneritic mantle-derived melts in the crust. The rapid heating and subsequent melting of the crust led to upward flow of partially molten rocks, doming and collapse of the belt.

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Section: Long-lived Crustal Melting and Catastrophic Granite Productionsupporting

confidence: 82%

Temporal relationships between Mg-K mafic magmatism and catastrophic melting of the Variscan crust in the southern part of Velay Complex (Massif Central, France)

Couzinié¹,

Moyen²,

Villaros³

et al. 2014

Jour. Geosci.

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“…Cordierite leucogranites gave Rb-Sr ages in the range of 305 to 295 Ma. These data are in disagreement with the 321 Ma obtained by [20] for new zircons crystallizing from the granitic melt. Our younger age coincides with the age that these authors obtained for the end of the anatexis at Peña Negra.…”

Section: The Rockscontrasting

confidence: 87%

“…The granodiorites gave a Rb-Sr age of 310 Ma [18,22]. This age coincides with the 309 Ma zircon age obtained by [20]. Granodiorites represent the most important anatectic product of the migmatites, with respect to volume, and their age also dates the most intense period of partial melting of the Complex.…”

Section: The Rockssupporting

confidence: 63%

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Evidence of Protolith Contamination in the Generation of an Anatectic Complex: Peña Negra, Central Spain

Pereira¹,

Alonso²,

Salman³

2008

TOMJ

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Abstract:The Peña Negra complex, in central Spain, provides a superb opportunity for the study of Variscan partial melting processes. The heat source for the anatexis has been controversial. The presence of mafic rocks in the vicinity has given rise to the suggestion that mafic magmas of mantle origin provided the requisite heat for the generation of the anatectic granites. Experimental petrology can be used to support this concept, but the volumes of mafic magma necessary for the anatexis appear improbably large. Geophysical models for Central Iberia do not support the presence of such large basic complexes at depth. Furthermore radiometric dating of the scarce mafic outcrops indicates that they are too old to have been involved in the granitic magma genesis. The alternative interpretation is that melting of the protolith was promoted by the radioactive decay of K, U and Th. Anatexis was enhanced by the existence of a fertile protolith and by the presence of shear structures that permitted volatile fluxing. The situation is believed to have been analogous to that in other European Variscan terrains.

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“…(Petitgirard et al, 2009), and sustained continuous anatexis for tens of m.y. (Montero et al, 2004). Also, Gordon et al (2009) suggested that the Valhalla migmatite complex in Canada maintained an elevated temperature, sufficient for an open U-Pb system in monazite, in excess of 7 m.y.…”

Section: Discussionmentioning

confidence: 99%

New monazite U-Pb age constraints on the evolution of the Paleoproterozoic Vaasa granitoid batholith, western Finland

Kotilainen¹,

Mänttäri²,

Kurhila³

et al. 2016

Bull Geol Soc Finland

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The Vaasa batholith, western Finland, is a large, peraluminous granitoid pluton that crystallized at 1.88-1.87 Ga during the culmination of the Svecofennian orogeny. The batholith has gradual contacts, through metatexites and diatexites, with the enveloping metasedimentary rocks of the Bothnian Belt. We present ID-TIMS U-Pb age data on monazite from granitoids and xenoliths of the Vaasa batholith and combine these with published U-Pb zircon ages in order to shed further light on the evolution of the Vaasa batholith. The apparent monazite ages for seven of the examined samples are 1870-1863 Ma, and 1855±3 Ma for one further sample from the southern part of the batholith. Combined with pre-existing data, the monazite ages of the granitoids are 9 to 18 Ma (face values) or 3 to 9 Ma (external errors considered) younger than the U-Pb zircon crystallization ages from respective samples. Our new data suggest slow cooling for the Vaasa batholith -the closure/saturation temperature of the monazite U-Pb system was probably reached in ~10 m.y. after the crystallization of magmatic zircon in the examined rocks.

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55 million years of continuous anatexis in Central Iberia: single-zircon dating of the Peña Negra Complex

Cited by 51 publications

References 16 publications

Temporal relationships between Mg-K mafic magmatism and catastrophic melting of the Variscan crust in the southern part of Velay Complex (Massif Central, France)

Temporal relationships between Mg-K mafic magmatism and catastrophic melting of the Variscan crust in the southern part of Velay Complex (Massif Central, France)

Evidence of Protolith Contamination in the Generation of an Anatectic Complex: Peña Negra, Central Spain

New monazite U-Pb age constraints on the evolution of the Paleoproterozoic Vaasa granitoid batholith, western Finland

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