High-Ti amphibole as a petrogenetic indicator of magma chemistry: evidence for mildly alkalic-hybrid melts during evolution of Variscan basic–ultrabasic magmatism of Central Iberia

Molina, J.F.; Scarrow, Jane H.; Montero, P.; Беа, Ф.

doi:10.1007/s00410-008-0371-4

Cited by 119 publications

(70 citation statements)

References 132 publications

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“…In the inner parts of the Iberian Variscan Belt most mafi c intrusions have ca1c-alkaline whole-rock composition. Nevertheless, the most recent models on their genesis involve a post collisional within-plate tectonic setting not consistent with subduction during these late stages of the Variscan collision (Scarr ow et al 2009;Orejana et al 2009). …”

Section: Introductionmentioning

confidence: 99%

“…ENd, ranges from +3.1 to -1.8; Orejana et al 2009) have been explained by the incOlpomtion of crustal components within the subcontinental mantle lithosphere (1-2% of subducted continental material fi ts the Sr-Nd isotopic composition of primitive Mg-rich gabbros in central Spain, Orejana et al 2009). Alternatively, these isotopic ratios could be explained by signifi cant crustal contamination of mantle-derived magmas at the base of the thickened Va riscan crust (Bea et al 1999;Scarr ow et al 2009). …”

Section: Introductionmentioning

confidence: 99%

“…These magmas have been considered as being fo rmed from primary alkaline mafi c melts of appinitic aff mity mixed with crustal peraluminous granite magmas during successive emplacement events (Scarr ow et al 2009;Molina et al 2009). Some mafi c-ultramafi c fa cies are rich in exotic accessories, interpreted as crustally derived xenocrysts (Bea et al 1999).…”

Section: Introductionmentioning

confidence: 99%

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U–Pb isotopic ages and Hf isotope composition of zircons in Variscan gabbros from central Spain: evidence of variable crustal contamination

et al. 2010

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Ion microprobe U-Pb analyses of zircons from three gabbroic intrusions from the Spanish Central System (SCS) (Talavera, La Solanilla and Navahermosa) yield Variscan ages (300 to 305 Ma) in agreement with recent studies. Only two zircon crystals from La Solanilla massif gave slightly discordant Paleoproterozoic ages (1,848 and 2,010 Ma). Hf isotope data show a relatively large variation with the juvenile end-members showing rHfj values as high as +3.6 to +6.9 and + 1.5 to +2.9 in the Navahermosa and

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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U–Pb isotopic ages and Hf isotope composition of zircons in Variscan gabbros from central Spain: evidence of variable crustal contamination

et al. 2010

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“…Fig. 7b shows that the compositions of amphibole from intermediate dikes are consistent with crystallization from subalkaline magmas, while those from the basic dikes have higher TiO 2 and Al 2 O 3 contents and thus fall into the transitional subalkaline-alkaline domain (Molina et al 2009). The compositional differences between amphiboles from both rock types may imply a difference in the physicochemical conditions of magmas from which they crystallized.…”

Section: Chemical Composition Of Mineralsmentioning

confidence: 78%

Geochemical signature of Eocene Kuh-e Dom shoshonitic dikes in NE Ardestan, Central Iran: implications for melt evolution and tectonic setting

Sarjoughian¹,

Kananian²,

Haschke³

et al. 2013

J. Geosci.

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The Late Eocene Kuh-e Dom composite intrusion forms a segment of the Urumieh-Dokhtar magmatic arc, which recorded syn-to post-collisional magmatism during the Alpine-Himalayan orogeny in central Iran. Numerous acid and intermediate-basic dikes intrude the composite intrusive complex of the arc segment and its host-rock assemblage. The silicic dikes of porphyric microgranite, porphyric microgranodiorite and aplite consist of quartz, K-feldspar, plagioclase (albite), biotite and rare amphibole. The dikes are of subaluminous composition with shoshonitic affinity. Trace-element patterns exhibit pronounced negative anomalies of Nb, Ta, Ti, P and Sr together with positive anomalies of Cs, Th, U and La suggesting partial melting of a quartzo-feldspathic crustal source. The intermediate-basic dikes with phonolite, basanite and trachyandesite chemical compositions typically contain pyroxene (diopside-augite) and plagioclase phenocrysts (An 30-60 and An 98 ), calcic amphiboles (magnesiohornblendemagnesiohastingsite), magnesian biotites and alkali-feldspars (Or 95 ). The rocks show shoshonitic geochemical affinities. Low Ba/Rb ratios and high Rb/Sr ratios suggest that the primary dike melt originated by partial melting of a phlogopite--bearing lithospheric mantle, whereas LILE and LREE enrichment along with low Nb/Zr and Hf/Sm ratios and high Ba/ Nb and Rb/Nb ratios imply that these rocks formed at a convergent continental margin. The acidic dikes were emplaced in a transitional syn-collisional subduction setting whereas the intermediate-basic dikes have developed from remnant melt batches after cessation of active subduction, mostly in the post-collisional setting.

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“…According to the biotite, amphibole, and pyroxene discrimination diagrams of Abdel-Rahman (1994), Molina et al (2009), andLe Bas (1962) respectively, the biotite, amphibole, and pyroxene from the Lar Cu-Mo prospect igneous rocks plot in the calc-alkaline fields (Figure 12). The diagrams based on the mineral chemistry do not discriminate the calc-alkaline, HKCA, and shoshonitic magmatic series.…”

Section: Nature Of the Magma And Geotectonic Environmentmentioning

confidence: 99%

Mineral chemistry of igneous rocks in the Lar Cu-Mo prospect, southeastern part of Iran: implications for P, T, and ƒO2

Moradi¹,

Boomeri²,

Bagheri³

et al. 2016

Turkish J Earth Sci

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IntroductionThe Lar Cu-Mo prospect located 22 km north of Zahedan, southeast Iran, at the border with Pakistan and Afghanistan is proximal to Saindak and the giant Reko Diq copper deposits of Pakistan (Figure 1a). The Lar Cu-Mo prospect mainly occurs in syenitic to monzonitic igneous rocks of the Lar igneous complex (LIC). Although the LIC has been subject of several petrological and geochemical studies (

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High-Ti amphibole as a petrogenetic indicator of magma chemistry: evidence for mildly alkalic-hybrid melts during evolution of Variscan basic–ultrabasic magmatism of Central Iberia

Cited by 119 publications

References 132 publications

U–Pb isotopic ages and Hf isotope composition of zircons in Variscan gabbros from central Spain: evidence of variable crustal contamination

U–Pb isotopic ages and Hf isotope composition of zircons in Variscan gabbros from central Spain: evidence of variable crustal contamination

Geochemical signature of Eocene Kuh-e Dom shoshonitic dikes in NE Ardestan, Central Iran: implications for melt evolution and tectonic setting

Mineral chemistry of igneous rocks in the Lar Cu-Mo prospect, southeastern part of Iran: implications for P, T, and ƒO2

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