Petrography, mineral chemistry of tourmaline, geochemistry and tectonic setting of Tertiary igneous rocks in Shurab area(west of Khusf), Southern Khorasan

Abstract

Tertiary igneous rocks of Shurab area in eastern part of Lut block include pyroxene andesite, andesite, trachy andesite, quartz andesite, diorite, quartz diorite and porphyric quartz monzodiorite. Plagioclase, hornblende, pyroxene, biotite and quartz are common minerals and alkali feldspar, opaque, sphene, apatite, tourmaline and zircon exists as minor minerals. Propylitization, chloritization, silisification and tourmalinization are common alterations. Based on electron microprob analysis, tourmaline in quartz monzodiorite is characterized by weakly chemical zoning, high Mg/Fe ratio from dravite type with alkaline nature that originated from Ca-poor metapelites and metapsammites. The studied rocks have low to medium-K calk-alkaline nature and their spider diagrams display enrichment in LILE such as Cs, Rb ,K , Sr and LREE and depletion in Nb,Ti and HREE that indicate their relation to subduction zone. Geochemical characteristics such as high Sr/Y and La/Yb ratios, high SiO2 and no Eu anomaly are comparable to high-SiO2 adakites. Shuorab adakitic rocks are likely originated from partial melting of the crust during delamination process.

Keywords


[1] وحدتی دانشمند ف.، خلقی م.ح.، " نقشه زمین شناسی 1:100000 خوسف”، سازمان زمین شناسی و اکتشافات معدنی کشور(1367).

[2] Berberian M., King. G. C. P., "Towards a Paleogeography and tectonic evoloution 0f iran", Nationael research council of Canada(1981).

[3] زرین‌کوب م. ح.، چانگ، س.ل، خطیب، م.م، محمدی،س. س.، " سنجی زیرکن _ اورانیوم، سنگ‌نگاشتی و ژئوشیمی توده‌های نفوذی کم‌عمق در جنوب‌باختری بیرجند(کوه رچ)"، مجله بلور‌شناسی و کانی شناسی ایران، سال هجدهم، شماره ٣، پاییز، (1389) ص ٤٧٣ - 484.

[4] سلیم ل.، زرین‌کوب م. ح ، محمدی، س.س، "مطالعات ژئوشیمیایی سنگ‌های آتشفشانی منطقه چشمه خوری(شمال غرب بیرجند)"، چهارمین همایش انجمن زمین شناسی اقتصادی ایران، دانشگاه بیرجند(1391).

[5] خواجه ع.، "پترولوژی و پتروگرافی سنگ‌های آذرین شمال غرب خوسف (شمال غرب بیرجند)"، پایان نامه کارشناسی ارشد، دانشگاه شهید بهشتی تهران (1389).

[6] خاکی خ.، "پترولوژی سنگ‌های آذرین ترشیری در منطقه رچ(جنوب غرب بیرجند)"، پایان‌نامه کارشناسی ارشد، دانشگاه آزاد اسلامی واحد خوراسگان(1389) 197صفحه.

[7]Shelly D., "Igneous and metamorphic rocks under the microscope", Chapman and Hall( 1993) 630p. [8] Berman .R.G., Brown .T.H., Green wood .H.J., "An internally consistent thermodynamic data base for minerals in the system Na2O – K2O- CaO-MgO-FeO-SiO2-Al2O3-Fe2O3-TiO2-H2O-CO2", Atomic Energy of Canada Technical report(1985)337-362. [9] Kretz R . , "Symbols for rock-forming mineralsl" , American Mineralogist68 (1983) 277-279.

[10] Renjith M. L., "Micro-textures in plagioclase from 1994-1995 eruption, Barren Island Volcano: Evidence of dynamic magma plumbing system in the Andaman subduction zone", Geoscience Frontiers 5(2014) P113-126.

[11] Spilde M . N., Brearley . A.J.,Papike .J.J., "Alteration of plagioclase and pyroxene phenocrysts in a fissure fumarole ,Valley of Ten Thousand Smokes", Alaska American Mineralogist, Volume 78(1993) P1066-1081.

[12] Vasily D., Shcherbakov, Pavel.Yu., Plechov Pavel.E. Izbekov Jill S. Shipman, "Plagioclase zoning as an indicator of magma processes At Bezymianny Volcano" ,Kamchatka,Contrib Mineral Petrol.DOI 10.1007/s00410-010-0584-1(2010).

[13]Middle most E.A.K.,"magma and magmatic rock, an introduction to igneous petrology ", (1988)469p.

[14] Best M. G.,"Igneous and metamorphic petrology", (2003) 729p.

[15] London D., Manning D.A.C.,1995, "Chemical variation and significance of tourmaline from SW England", Economic Geology, 495–519.

[16] Truscott M.G., Shaw D.M., "Boron in chert and Precambrian siliceous iron formation", Geochimca et Cosmochimca Acta 48(1948) 2220-2313.

[17] Samson I.M., Sinclair W.D., "Magmatic hydrothermal fluids and the origin of quartz tourmaline orbicules in the Seagull batholith, Yukon Territory", Canadian Mineralogist 30(1992)937-954.

[18] Henry D. J., Guidotti C. V., "Tourmaline as a petrogenetic indicator mineral: an example from the staurolite grade metapelites of NW-Marine". American Mineralogist 70(1985)P 1-15.

[19] Cox K.G., Bell.G.D., & PanKhurste, "The tnterpretation of igneos rocks", Allen and Unwin, London,( 1979) 450 P.

[20]Winchester, J.A., Floyd, P.A., "Geochemical discrimination of immobile elements", Chemical Geology20(1977)P 325-343.

[21]Irvine T.V., Baragar.W.R.A., "A guide to the chemical classification of the common volcanic rocks", Canadian Journal of Earth Science 8(1971) P 532-548.

[22] Peccerillo A., Tylor.S.R., "Geochemistry of Eocene calc-alkaline volcanic rocks from The Kastamonu area, Northern Turkey", Contributions to Mineralogy and Petrology 58(1976)P 63-81.

[23] Shand S.J., "Eruptive Rocks:Their Genesis, Composition, Classification, and Their Relation to Ore-Deposits with a Chapter on Meteorite " , 2nd Edition, John Wiley & Sons, New York( 1943) p 1–444.

[24] Huang X.L., Yu.Y., Li.J., Tong.L.L., "Geochronology and and petrogenesis Of the early Paleozoic I-type granite in the thiashan area,South china, middle-lower crustal melting during orogenic collapse", lithos, 177(2013)P268-284.

[25] Chappell B. W., Bryant. C,J., Wyborn.D., "Peraluminous I-type granites", Lithos153(2012)P 142-153.

[26] Sun S. and McDonough.W.F., "Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes", Geological Society, London, Special Publications 42(1989)P313-345.

[27] Nakamura., "Determination of REE, Ba, Fe, Mg, Na and K in carbonaceous and ordinary chondrites", Geochimica Cosmochimica Acta 38(1974)P757-775.

[28] Castillo P. R., "An overview of adakite petrogenesis", Chinese Science Bulletin 51(2006) p 257—268.

[29] Castillo P. R., "Adakite petrogenesis", Lithos 134–135(2012)P304–316.

[30] Harris N.B.W., Pearce . J.A., Tindle . A.G., "Geochemical characteristics of collision – zone magmatism", Geological society, London, Special Publication 19(1986) P 67-81.

[31]Martin H., "The adakitic magmas:modern analogues of Archaeangranitoids", Lithos 46(1999)P 411-429.

[32] Rollinson H.R., "Using Geochemical Deta:Evolution, Presentation and Interpretation Evidence of dynamic magma plumbing system in the Andaman subduction zone", Geoscience Frontiers 5 (1993)113-126, Longman Scientific and Technical, England, 352 P.

[33] Kogiso T ., Tatsumi. Y., Nakano. S., "Trace element transport during dehydration processes in the subducted oceanic crust: 1. Experiments and implications for the origin of ocean island basalts", Earth and Planetary Science Letters 48 (1997)P 193-205.

[34] Dupuy C ., Micharad . A., Dastal.J., "Proterozoic flood basalt from the coppermine river area , north weste territories – isotope and trace element- geochemistry Canadian", Journal of earth sciences 29 (1992) P1934-1943.

[35]Winter, J. D., "An introduction to Igneous and Metamorphic Petrology" , Prentice Hall (2001) 697 p.

[36]Kay, R. W., "Aleutian magnesian andesites: Melts from subducted Pacific Ocean crust" , Journal of Volcanology and Geothermal Research 4 (1978) P117-132.

[37] Drummond, M.S., Defant, M.J., "A model for trondhjemite–tonalite–dacite genesis and crustal growth via slabmelting: Archaean to modern comparisons", Journal of Geophysical Researches95(1990) 21503– 21521.

[38] Defant, M.J., Drummond, M.S., "Derivation of some modern arc magmas by melting of young subducted lithosphere" Nature 347(1990) P 662–665.

[39] Karsli O., Uysal.T , Dilek. Y , Aydin. F and Kandemir.R., "Geochemical modelling of early Eocene adakitic magmatism in the Eastern Pontides, NE Anatolia: continental crust or subducted oceanic slab origin? "International Geology Review55, No16 (2013) 2083–2095.

[40] Martin H., Smithies R.H., Rapp. R., Moyen. J.F., Champion. D., "An overview of adakite, tonalite-trondhjemite-granodiorite (TTG) and sanukitoid :relationships and some implications for crustal evolution" , Lithos 79(2005) 1 – 24.

[41] Stern, C.R., Futa, K.,. "An Andean andesite derived directlyfrom subducted MORB or from LIL depleted subcontinentalmantle". Trans. - Am. Geophys. :union: 63(1982)1148.

[42] Zarrinkoub M. H., Pang K.N, Chung .S.L, Khatib .M. M., Mohammadi .S. S., Chiu. H.Y., Lee H.Y.," Zircon U–Pb age and geochemical constraints on the origin of the Birjand ophiolite, Sistan suture zone, eastern Iran", Lithos 154(2012) 392–405.

[43] Pang K.N., Chung. S.L., Zarrinkoub M. H., Khatib M. M., Mohammadi S. S., Chiu H.Y., Chu C.H., Lee H.Y., Lo C.H., "Eocene–Oligocene post-collisional magmatism in the Lut–Sistan region, eastern Iran:Magma genesis and tectonic implications", Lithos 180-181(2013) 234-251.