Generation of Arc and Within-plate Chemical Signatures in Collision Zone Magmatism: Quaternary Lavas from Kurdistan Province, Iran

Allen, Mark B.; Kheirkhah, Monireh; Emami, Mohammad Hashem; McLeod, Claire

doi:10.1093/petrology/egs090

Cited by 108 publications

(52 citation statements)

References 112 publications

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“…Tainton and M c Kenzie (1994) used the trace element composition of kimberlites and other alkaline rocks, especially the concentrations of the rare earth elements, to show that their source regions had been strongly depleted by basalt removal. The same approach has been used to estimate the density contrast resulting from composition alone between the source regions of the alkaline rocks and the convecting upper mantle (see Supplementary Material), using melt compositions whose MgO concentration is 6% or more, taken from Allen et al (2013), Gibson (personal communication), Nomade et al (2004), Williams et al (2004) and Guo et al (2006). The resulting values in Fig.…”

Section: Craton Formationmentioning

confidence: 99%

Speculations on the formation of cratons and cratonic basins

McKenzie

2016

Earth and Planetary Science Letters

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Section: Craton Formationmentioning

confidence: 99%

Speculations on the formation of cratons and cratonic basins

McKenzie

2016

Earth and Planetary Science Letters

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“…However, the high Th/La values (0.21-0.26) and Th concentrations (7.4-9.4 ppm) in the basaltic andesites may reflect a subducted sediment component in the mantle source (e.g., Plank, 2005) or small amount (<10 wt%) of contamination of crustal materials (Kimura and Yoshida, 2006). OIB-like rocks can be generated in subduction settings by melting of amphibole-and rutile-bearing HFSE-enriched sources (Allen et al, 2013); however, there is no evidence for subducted sediment related fluid activity in our OIB-type gabbros, as these samples have low Th/La ratios (0.10-0.12; Plank, 2005) and no Ce anomalies on the normalized plots (Fig. 8).…”

Section: Constraints On Mantle Sourcesmentioning

confidence: 99%

Petrogenises of Triassic gabbroic and basaltic rocks from Chukotka, NE Russia: Eastern end of the ‘arc–type’ Siberian LIP?

Desta

Ishiwatari

Machi

et al. 2015

Journal of Mineralogical and Petrological Sciences

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The Triassic gabbroic intrusions and associated basaltic lavas from Chukotka are mainly tholeiitic with both ocean island basalt (OIB) and island arc basalt (IAB)-type geochemical signatures. Mg-number [Mg# = 100 × Mg/(Mg + Fe 2+ )] is around 40 for OIB-type gabbros, ranges from 48 to 66 for IAB-type hornblende-rich gabbros, and 43 to 65 for IAB-type basaltic rocks (ankaramites, lamprophyres, pyroxene-phyric basalts and hornblende-phyric basaltic andesite). TiO 2 contents of the IAB-type gabbros and basaltic rocks are low (<2 wt%), but are high in OIB-type gabbros (4.3-5.3 wt%). OIB-type gabbros are typically enriched in FeO * (16-18 wt%) as compared to IAB-type gabbros (10-14 wt%) and IAB-type lavas (ankaramites,~10 wt%; lamprophyres,~14; pyroxene-phyric basalt, 11 wt% and basaltic andesite, 9-10 wt. %). In the primitive mantle normalized trace element patterns, IAB-type basalts and gabbros are characterized by depletion in HFSE (Nb, Ta, Zr and Hf ) and enrichment in LILE. OIB-type gabbros can be distinguished from the rests by the absence of HFSE depletion, with strong negative Sr anomaly. The positive Ti anomaly in the OIB-type gabbros can be attributed to high content of ilmenite in these rocks. Trace element characteristics of IAB-type gabbroic rocks and basalts are compatible with their magmas derived from subduction influenced melts, whereas OIB-type gabbros show within-plate geochemical characteristics. IAB-type gabbros and basaltic rocks display similar geochemical features to the low-Ti Nadezhdinsky suit (Noril'sk region) and Bel'kov dolerite (New Siberian Islands) of the Siberian large igneous province (LIP) in view of HFSE depletion and high H 2 O content of the magma to crystallize abundant hornblende not only in gabbros but also as phenocrysts in basalts. The Triassic gabbroic and basaltic rocks of both OIB and IAB types may as a whole represents the eastern end of the Siberian LIP.

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“…In addition to these intermediate-composition volcanic complexes, widespread but scattered eruption of mafic alkaline lavas from monogenetic vents likely reflects lithospheric mantle melting during post-collisional stress relaxation or localized extension (Ahmadzadeh et al, 2010;Allen et al, 2013;Kheirkhah et al, 2013;Pang et al, 2013).…”

Section: Regional Geological and Metallogenic Setting Of The Taftan Amentioning

confidence: 99%

Magmatic evolution and porphyry–epithermal mineralization in the Taftan volcanic complex, southeastern Iran

Richards

Razavi

Spell

et al. 2018

Ore Geology Reviews

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The Taftan volcanic complex is located above the Makran subduction zone in Sistan and Baluchestan province, southeastern Iran. The earliest volcanic activity at Taftan started in the late Miocene (~8 Ma) with eruption of andesitic to dacitic lava onto a Cretaceous to Eocene volcanic and sedimentary paleosurface ~20 km to the northwest of the current volcanic Eurasian plates (late Oligocene to earliest Miocene), and the subduction-related BazmanTaftan and Chagai Belt magmas. The porphyry deposits formed in these distinct settings are also virtually indistinguishable. This suggests that most of the processes affecting the geochemistry and metallogeny of the magmas in both settings take place in the lithosphere, albeit that the ultimate source of the magmas is in the supra-subduction zone asthenospheric mantle wedge. In collisional environments, subduction-related material previously crystallized in the deep lithosphere is simply being remobilized.

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Generation of Arc and Within-plate Chemical Signatures in Collision Zone Magmatism: Quaternary Lavas from Kurdistan Province, Iran

Cited by 108 publications

References 112 publications

Speculations on the formation of cratons and cratonic basins

Speculations on the formation of cratons and cratonic basins

Petrogenises of Triassic gabbroic and basaltic rocks from Chukotka, NE Russia: Eastern end of the ‘arc–type’ Siberian LIP?

Magmatic evolution and porphyry–epithermal mineralization in the Taftan volcanic complex, southeastern Iran

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