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Aliani F, Daraeezadeh Z. Mineral chemistry of isotropic gabbros from the Kermanshah ophiolite: Evidence for it's tectonic setting. www.ijcm.ir 2018; 26 (3) :635-650
URL: http://ijcm.ir/article-1-1147-en.html
URL: http://ijcm.ir/article-1-1147-en.html
1- Bu -Ali Sina University
Abstract: (3411 Views)
Isotropic gabbros of Kermanshah ophiolite include olivine gabbro, gabbro, gabbronorite, olivine gabbronorite and troctolite. The isotropic gabbros are medium to fine grained with euhedral to subhedral orthopyroxenes, clinopyroxenes and subhedral plagioclase, olivine together with rare amphiboles. Mineral chemistry of isotropic gabbros reveal that the clinopyroxenes are diopsidic to augitic in composition within the compositional ranges of En(50.91–45.79), Fs(7.41–3.64), and Wo(48.5–43.81). They are Ca-rich and Na poor (Na2O < 0.54 wt%) characterized by high-Mg (Mg# 85.62–89.35) and low-Ti (TiO2 < 0.28 wt%) contents. Plagioclases are bytownite in compositions (An(70.51–90.15), Ab(9.62-29.02) and Or (0/00-0.63), orthopyroxene are mostly enstatites within the compositional ranges of En(78.27-84.94), Fs(13.0-20.07) and Wo(1.43-3.36), olivine, forstrite and amphiboles are Mg-rich (tremolite, actinolite to actinohornblendes) with Mg# (64.35-84/86). The presence of highly magnesian olivines (Fo 80.07–84.82), clinopyroxenes (Mg# 85.62–89.35), and orthopyroxenes (Mg# 79.59–85.72) as well as highly calcic plagioclases (An 70.51–90.15) and amphiboles in the isotropic gabbros indicates a subduction-related tectonic environment. The tectonic discrimination plots of clinopyroxene data indicate island arc signature of the source magma. The results of studies confirm that the Kermanshah ophiolite formed in a suprasubduction zone environment in the southern branch of Neotethys
References
1. [1] Shafaii Moghadam H., Stern, R. J., "Late Cretaceouse fore arc ophiolites of Iran", Island Arc 20 (2011) 1-4. [DOI:10.1111/j.1440-1738.2010.00745.x]
2. [2] Shahidi M., Nazari, H., "Geological map of Harsin, 1/100.000 scale", Geological survey of Iran, Tehran, 1997.
3. [3] Bağci U., "The geochemistry and petrology of the ophiolitic rocks from the Kahramanmaraş region, southern Turkey", Turkish Journal. Earth Science 22 (2013) 1–27.
4. [4] Arvin M., Babaei A., Ghadmi G., Dargahi S., Ardekani A.S., "The origin of the Kahnuj ophiolitic complex, SE of Iran: Constraints from whole rock and mineral chemistry of the Bande-Zeyarat gabbroic complex", Ofioliti 30 (2005) 1-14.
5. [5] Boudier F., Godard M., Armbruster C., "Significance of gabbronorite occurrence in the crustal section of the Semail ophiolite", Marine Geophysical Research 21 (2000) 307-326. [DOI:10.1023/A:1026726232402]
6. [6] Parlak O., Delaloye M., Bíngöl E., "Mineral chemistry of ultramafic and mafic cumulates as an indicator of the arc-related origin of the Mersin ophiolite (southern Turkey)", Geologische Rundschau 85 (1996) 647-661. [DOI:10.1007/BF02440102]
7. [7] Parlak O., Höck V., Delaloye M., "Suprasubduction zone origin of the Pozanti-Karsanti ophiolite (southern Turkey) deduced from whole-rock and mineral chemistry of the gabbroic cumulates", Geological Society, London, Special Publications 173 (2000) 219-234. [DOI:10.1144/GSL.SP.2000.173.01.11]
8. [8] Pallister J.S., Hopson C.A., "Samail ophiolite plutonic suite: field relations, phase variation, cryptic variation and layering, and a model of a spreading ridge magma chamber", Journal of Geophysical Research: Solid Earth 86 (1981) 2593-2644. [DOI:10.1029/JB086iB04p02593]
9. [9] Yellappa T., Tsungogae T., Chetty T.R.K., Santosh M., "Mineral chemistry of isotropic gabbros from the Manamedu Ophiolite Complex, Cauvery Suture Zone, southern India: Evidence for neoproterozoic suprasubduction zone tectonics", Journal of Asian Earth Sciences 130 (2016). [DOI:10.1016/j.jseaes.2016.06.019]
10. [10] Amini S., Moradpour R., Zareii Sahamieh R., "Petrography, geochemistry and petrology of the South Sahneh Ophiolite Complex (NE Kermanshah)", Journal of Crystallography and mineralogy of Iran 13 (2) (2007) 225-246 (in Persian).
11. [11] Kertz R., "Symbols for rock-forming minerals", American Mineralogist, 68 (1983) 277-279.
12. [12] Morimoto N., Fabries J., Ferguson A.K., Ginzburg I.V., Ross M., Seifert F.A., Zussman J., Aoki K., Gottardi G., "Nomenclature of pyroxenes", American Mineralogist 73 (1988) 1123–1133.
13. [13] Deer W.A., Howie R.A., Zussman J., "An introduction to the rock-forming minerals" Longman London 696 (1992).
14. [14] Leake E.B., Wooley A.R., Arps C.E.S., Birch W.D., Gilbert M.C., Grice J.D., Hawthorne F.C., Kato A., Kisch H.J., Krivovichev V.G., Linthout K., Laird, J., Mandarino J., Maresch W.V., Nickhel E.H., Rock N.M.S., Schumacher J.C., Smith D.C., Stephenson N.C.N., Ungaretti L., Whittaker E.J.W., Youzhi G., "Nomenclature of Amphiboles", European Journal of Mineralogy 9 (1997) 623-651. [DOI:10.1127/ejm/9/3/0623]
15. [15] Le Bas M.J., "The role of aluminum in igneous clinopyroxenes with relation to their parentage", American Journal of Science 260(1962) 267-288. [DOI:10.2475/ajs.260.4.267]
16. [16] Leterrier J., Maury R.C., Thonon P., Girard D., Marehal M., "Clinopyroxene composition as a method of identification of the magmatic affinities of paleo-volcanic series", Earth and Planetary Science Letters 59(1982) 139-154. [DOI:10.1016/0012-821X(82)90122-4]
17. [17] Green T.H. Ringwood A., "Genesis of the calc-alkaline igneous rock suite", Contributions to Mineralogy and Petrology 18 (1968) 105-162. [DOI:10.1007/BF00371806]
18. [18] Elthon D., "Petrology of gabbroic rocks from the Mid‐Cayman Rise spreading center", Journal of Geophysical Research: Solid Earth 92 (1987) 658-682. [DOI:10.1029/JB092iB01p00658]
19. [19] Parlak O., Hoeck V., Delaloye M., "The suprasubduction zone Pozanti-Karsanti ophiolite, southern Turkey: evidence for high-pressure crystal fractionation of ultramafic cumulates", Lithos 65 (2002) 205–224. [DOI:10.1016/S0024-4937(02)00166-4]
20. [20] Wass, S. Y., "Multiple origins of clinopyroxenes in alkali basaltic rocks", Lithos 12 (1979)115-132. [DOI:10.1016/0024-4937(79)90043-4]
21. [21] Asthana D., "Relict clinopyroxenes from within-plate metadolerites of the Petroi Metabasalt, the New England fold belt, Australia", Mineralogy Magazine 55 (1991) 549-651. [DOI:10.1180/minmag.1991.055.381.08]
22. [22] Beccaluva L., Macciotta G., Piccardo G.B.O., "Clinopyroxene composition of ophiolite basalts as petrogenetic indicator", Chemical Geology 77 (1989) 165-182. [DOI:10.1016/0009-2541(89)90073-9]
23. [23] Medaris L.G., "High-pressure peridotites in south-western Oregon", Geological Society of America Bulletin. 83(1972) 41–58. [DOI:10.1130/0016-7606(1972)83[41:HPISO]2.0.CO;2]
24. [24] Bağci U., Parlak O., Höck V., "Geochemical character and tectonic environment of ultramafic to mafic cumulate rocks from the Tekirova (Antalya) ophiolite (southern Turkey)", Geological Journal 41 (2006) 193-219. [DOI:10.1002/gj.1035]
25. [25] DeBari S.M., Coleman R., "Examination of the deep levels of an island arc: Evidence from the Tonsina Ultramafic‐Mafic Assemblage, Tonsina, Alaska", Journal of Geophysical Research: Solid Earth 94(1989) 4373-4391. [DOI:10.1029/JB094iB04p04373]
26. [26] Saccani E., Allahyari Kh., Beccaluva L., Bianchini G., "Geochemistry and petrology of the Kermanshah ophiolites (Iran): Implication for the interaction between passive rifting, oceanic accretion, and OIB-type components in the Southern Neo-Tethys Ocean", Gondwana Research 24 (2013) 392-411. [DOI:10.1016/j.gr.2012.10.009]
27. [27] Saccani E., Azimzadeh Z., Dilek Y., Jahangiri A., "Geochronology and petrology of the Early Carboniferous Misho Mafic Complex (NW Iran), and implications for the melt evolution of Paleo-Tethyan rifting in Western Cimmeria", Lithos 162 (2013) 264-278. [DOI:10.1016/j.lithos.2013.01.008]
28. [28] Desmons, J., Beccaluva, L., "Mid-ocean ridge and island-arc affinities in ophiolites from Iran: palaeographic implications: complementary reference", Chemical Geology 39(1-2) (1983):39-63. [DOI:10.1016/0009-2541(83)90071-2]
29. [29] Ghazi A.M., Hassanipak A. A., "Geochemistry of subalkaline and alkaline extrusives from the Kermanshah ophiolite, Zagros Suture Zone, Western Iran: Implications for Tethyan plate tectonics", Asian Journal of Earth Sciences 17 (1999): 319-332. [DOI:10.1016/S0743-9547(98)00070-1]
30. [30] Allahyari K., Saccani, E., Pourmoafi, M., Beccaluva L., Masoudi F., "Petrology of mantle peridotites and intrusive mafic rocks from the Kermanshah ophiolitic complex (Zagros belt, Iran): implications for the geodynamic evolution of the Neo-Tethyan oceanic branch between Arabia and Iran", Ofioliti 35(2010): 71–90.
31. [31] Torkian A., Daraee zadeh Z., Aliani F., "Application of geochemical data for determining tectonic setting of diabasic dykes in the Kermanshah ophiolite; Sahneh-Harsin area", Journal of Crystallography and mineralogy of Iran 21(2) (2012) 331-342 (in Persian).
32. [32] Bağci U., Parlak O., Höck V., "Geochemistry and tectonic environment of diverse magma generations forming the crustal units of the Kızıldağ (Hatay) ophiolite, Southern Turkey", Turkish Journal of Earth Sciences 17 (2008) 43-71.
33. [33] Bağci U., Parlak O., "Petrology of the Tekirova (Antalya) ophiolite (Southern Turkey): evidence for diverse magma generations and their tectonic implications during Neotethyan-subduction", International Journal of Earth Sciences 98 (2009) 387-405. [DOI:10.1007/s00531-007-0242-7]
34. [34] Beccaluva L., Coltorti M., Giunta G., Siena F., "Tethyan vs Cordilleran ophiolites: a reappraisal of distinctive tectono-magmatic features of suprasubduction complexes in relation to the subduction mode", Tectonophysics 393 (2004) 163–174. [DOI:10.1016/j.tecto.2004.07.034]
35. [35] Beccaluva L., Coltorti M., Saccani E., Siena F., "Magma generation and crustal accretion as evidenced by supra‐subduction ophiolites of the Albanide–Hellenide Subpelagonian zone", Island Arc 14 (2005) 551-563. [DOI:10.1111/j.1440-1738.2005.00483.x]
36. [36] Saccani E., Photiades A., "Mid-ocean ridge and supra-subduction affinities in the Pindos ophiolites (Greece): implications for magma genesis in a forearc setting", Lithos 73 (2004) 229-253. [DOI:10.1016/j.lithos.2003.12.002]
37. [37] Saccani E., Photiades A., "Petrogenesis and tectonomagmatic significance of volcanic and subvolcanic rocks in the Albanide–Hellenide ophiolitic mélanges", Island Arc 14 (2005) 494-516. [DOI:10.1111/j.1440-1738.2005.00480.x]
38. [38] Tanirli M., Rizaoglu T., "Whole-rock and mineral chemistry of mafic cumulates from the Low-Ti ophiolite in the southern part of Kahramanmaras, Turkey", Russian Geology and Geophysics 57 (2016) 1398-1418. [DOI:10.1016/j.rgg.2016.01.018]
39. [39] Burns L.E., "The Border Ranges ultramafic and mafic complex, south-central Alaska: cumulate fractionates of island-arc volcanics", Canadian Journal of Earth Sciences 22 (1985) 1020-1038. [DOI:10.1139/e85-106]
40. [40] Hebert R., Laurent R., "Mineral chemistry of ultramafic and mafic plutonic rocks of the Appalachian ophiolites, Quebec, Canada", Chemical Geology 77 (1989) 265-285. [DOI:10.1016/0009-2541(89)90078-8]
41. [41] Hebert, R., Laurent, R., "Mineral chemistry of the plutonic section of the Troodos ophiolite: New constraints for genesis of arc–related ophiolites, in: Malpas, J., Moores, E., Panayiotou, A., Xenophontos, C. (Eds.), Ophiolites—Oceanic Crustal Analogues", Proc. Troodos Ophiolite Symposium–1987. Cyprus (1990) 149–163.
42. [42] Rizaoglu T., Parlak O., Hoeck V., I.sler F., "Nature and significance of Late Cretaceous ophiolitic rocks and its relation to the Baskil granitoid in Elazig region, SE Turkey, in: Robertson, A.H.F., Mountrakis, D. (Eds.), Tectonic Development of the Eastern Mediterrranean Region. Geolical Society, London, Specific. Publication 260 (2006) 327–350.
43. [43] Johannes W., "Melting of plagioclase in the system Ab-An- and Qz-Ab-An at PH2O=5 kbars, an equilibrium problem", Contributions to mineralogy and petrology 66 (1978) 295-303. [DOI:10.1007/BF00373413]
44. [44] Kushiro I., "The system forsterite-diopside-silica with and without water at high pressures", American Journal Science 267 (1969) 269-294.
45. [45] Sisson T.W., Grove T.L., "Experimental investigations of the role of H2O in calc-alkaline differentiation and subduction zone magmatism", Contributions to mineralogy and petrology 113 (1993) 143-166. [DOI:10.1007/BF00283225]
46. [46] Arculus R.J., Wills K.J., "The petrology of plutonic blocks and inclusions from the Lesser Antilles island arc", Journal of Petrology 21(1980) 743-799. [DOI:10.1093/petrology/21.4.743]
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