Zircon U–Pb Geochronology, Geochemistry, petrogenesis and tectonic significance of the Boroon Igneous Masses (East of Iran)
Paper Details
Zircon U–Pb Geochronology, Geochemistry, petrogenesis and tectonic significance of the Boroon Igneous Masses (East of Iran)
Abstract
The Boroon igneous masses are Cu bearing porphyries that outcrop in the North part of the Lut Block, about 20 km north-west of Ferdows. These igneous masses occur mainly as dykes and stocks that intrude Eocene volcanics and pyroclastics. Hydrothermal alteration affected these igneous masses, as revealed by the common ocurrence of sericite, chlorite, sphene/leucoxene, epidote and calcite. Chemical classification criteria show that the intrusives may be named as gabbrodiorites, diorites, monzodiorites and tonalites. Major element geochemistry reveals that all the studied lithologies are typically metaluminous (A/CNK ≤ 0.9) and, in addition, trace element patterns normalized to chondrite and primitive mantle are very similar to each other and show enrichments in LREE relative to HREE and in LILE relative to HFSE, as well as negative anomalies of Ta, Nb and Ti. Eu/Eu* ratios vary from 0.88 (in the most mafic composition) to 0.65, showing that plagioclase played a role in magma differentiation. LA-MC-ICP-MS U-Pb zircon data from Tonalite Porphyry yield similar concordia ages of ca. 40.31±1.1 Ma (2σ), which corresponds to the Eocene period. The whole set of geochemical data agree with the emplacement of the studied intrusions in a magmatic belt above a subduction zone. Primitive magmas should have formed by melting of mantle wedge peridotite, and, during magma ascent to crustal levels, both magma differentiations by crystal fractionation and crustal contamination took place. Sulfide mineralizations related to these igneous masses is common and occurs both disseminated and as hydrothermal veins, indicating a high mineralization potential for this area.
Aghanabati S. 1383. Geology of Iran. Publications of the Geological Survey of Iran.
Porlatifi A. 1382. Geological map of Ferdows 1/100000. Publications of the Geological Survey of Iran.
Geological and mining Exploration of Iran. 1382. Geochemical Exploration in a 1: 100,000 Ferdows map.
Angiboust S, Agard P, De Hoog JCM, Omrani J, Plunder A. 2013. Insights on deep. Accretionary subduction processes from the Sistan ophiolitic“melange”(Eastern Iran). Lithos 156–159, 139–158.
Arjmandzadeh R, Santos SA. 2013. Sr–Nd isotope geochemistry and tectonomagmatic setting of the Dehsalm Cu–Mo porphyry mineralizing intrusives from Lut Block. eastern Iran. International Journal of Earth Sciences, (GeolRundsch) 103, 123-140 p.
Borg LE, Clynne MA, Bullen TD. 1997. The variable role of slab-derived fluids in the generation of a suite of primitive calc-alkaline lavas from the southernmost Cascades. California. The Canadian Mineralogist 35. 425–452.
Boynton WV. 1985. Cosmochemistry of the rare earth elements: meteorite studies. in rare earth element geochemistry. Elsevier. Amsterdam.
Berberian M, King GC. 1981. Towards a paleogeography and tectonic evolution of Iran. Canadian Journal of Earth Sciences (18), 210–265.
Babazadeh SA, De Wever P. 2004. Early Cretaceous radiolarian assemblages from radiolarites in the Sistan Suture (eastern Iran). Geodiversitas 26. 185–206.
Camp VE, Griffis RJ. 1982. Character. genesis and tectonic setting of igneous rocks in the Sistan suture zone. eastern Iran. Lithos 15. 221–239.
Chappell BW, White AJR. 1992. I- and S- type granites in the Lachlan Fold Belt. Transactions of the Royal Society of Edinburg. Earth Science (83), 1-26.
Chappell BW, White AJR. 2001. Two contrasting granite type: 25 years later. Australian Journal of Earth Science (48), 489-499.
Chen B. 2009. Petrogenesis of mafic enclaves from the north Taihang Yanshanian intermediate to felsic plutons: evidence from petrological. Geochemical. and zircon Hf–O isotopic data. Science in China Series D: Earth Sciences 52, 1331–1344.
Clemens JD, Stevens G, Farina F. 2011. The enigmatic sources of I-type granites: the peritectic connexion. Lithos 126 (3–4), 174–181.
Defant MJ, Drummond MS. 1990. Derivation of some modern arc magmas by melting of young subducted lithosphere. Nature (347), 662–665.
Dela Roche H, Leterrier J, Grande Claude P, Marchal M. 1980. A classification of volcanic and plutonic rocks using R1-R2 diagrams and major element analyses its relationships and current nomenclature. Chemical Geology (29), 183–210.
De Paolo DJ. 1981. Trace element and isotopic effects of combined wallrock assimilation and fractional crystallisation. Earth Planet. Sci. Lett. 53. 189-202.
Eby GN, Woolley AR, Din V, Platt G. 1998. Geochemistry and petrogenesis of nepheline syenite: Kasungu–Chipala Ilombaand Ulindi nepheline syenite in-trusions. North Nyasa Alkaline Province.Malawi. Journal of Petrology 39. 1405– 1424.
Faure G, Mensing TM. 2005. Isotopes: Principles and Applications. John Wiley and Sons. New Jersey.
Gust DA, Arculus RA, Kersting AB. 1997. Aspects of magma sources and processes in the Honshu arc. The Canadian Mineralogist 35. 347–365.
Gill JB. 1981. Orogenic andesites and plate tectonics. Springer. New York.
Griffis AR, Magries H, Abedian N, Behrozi A. 1991. Explanatory text of Dehsalm (Chahvak). Geological Quadrangle Map 1:250000. No. K6. Geological Survey of Iran. Tehran.
Hanchar JM, Hoskin PWO. 2003. Zircon. Reviews in Mineralogy and Geochemistry 53. 1–500.
Henderson P. 1984. Rare Earth Element Geochemistry. Elsevier. Amsterdam. 510 p..
Ishihara S. 1977. The magnetite- series and ilmenite-series granitic rocks. Mining Geology (27), 293-305.
Ishihara S. 1981. The granitoid series and mineralization. Economic Geology (75), 458-484.
Saied Ansari, Mina Sakhdari (2016), Zircon U–Pb Geochronology, Geochemistry, petrogenesis and tectonic significance of the Boroon Igneous Masses (East of Iran); JBES, V8, N1, January, P52-64
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