PERIDODITIC XENOLITHS IN ALKALINE BASALTS ATTEKlRDAG REGION (THRACE)

Year 1999, Volume: 121 Issue: 121, 57 - 57, 01.02.1999

Fahri Esenli

Abstract

In basaltic volcanics at Tekirdağ
region (Thrace), peridodit(ic) xenoliths such as harzburgite and dunite thought
as parts of upper mantle has been found. Petrographically, the bazaltic lavas
are olivine-basalts showing a primary paragenesis including mainly plagioclaze.
olivine. augite. magnetite and scarcely hypersthene as well the secondary
minerals at important degrees locally. On the other hand, geochemically they
correspond to the alkaline basalt, trachybasalt basanitic rock types.
Peridodite xenolithenclosing Hacıköy and Balabanlı and excluding Muratlı
basalts also differ in both major and trace element contents. Including olivine
(forsterite). enstatite, Cr-spinel and scarcely diopside, the peridodite
xenoliths are typically protogranular and partly grading into porphyroclastic
in fabric. Magmatic textures are well preserved. Displaying no foliation or
lineation. those have coarseto huge grain sizes. Bandings resembling twinning
and deformation lamellas imply the mechanical effec and are characteristic for
the olivines and pyroxenes. Whether, the presence of relations depicting
partially melting of original mantle, between major elements of the peridodite
xenoliths is a fact, the melting point is probably not high. They were
uneffected by metasomatism and submit a somewhat consumpted composition
compared to primitive mantle.

Keywords

Alkaline basalt, xenolitfi, peridodite, Thrace-Turkey

References

• Bodinier, J.L., 1988, Geochemistry and Petrogenesis of the Lanzo peridotite body, western Alps: Tecto- nophysics. 149, 67-88.
• Cong, B. ve Zhang, R., 1983, Petrogenesis of Hannuoba basalts and their ultramafic inclusions. Scientia Si- nica, 26, 308-315.
• Downes, H.; Embey-İsztin, A. ve Thirlwall, M.; 1992, Pet- rology and geochemistry of spinel peridotite xeno- liths from the western Pannonian Basin (Hungary): evidence for an association between enrichment and texture in the upper mantle. Contrib. Mineral, and Petrol., 109,340-354.
• Embey-İsztin, A.; Scharbert, H.G.; Dietrich, H. ve Poulti- dis, H.; 1989, Petrology and geochemistry of peri- dotite xenoliths in alkali basalts from the Transda- nubian Volcanic region, western Hungary: Journal of Petrology, 30, 79-105.
• Ercan, T., 1979, Batı Anadolu, Trakya ve Ege adalarında- ki Senozoyik volkanizması: Jeoloji Mühendisliği Derg., 9, 23-46.
• 1992, Trakya'daki Senozoyik volkanizması ve bölgesel yayılımı: Jeoloji Mühendisliği Derg., 41, 37-50.
• Frey, F.A.; Suen C.J. ve Stockman, H.W., 1985, The Ron- da high temperature peridotite: Geochemistry and Petrogenesis. Geochimica et Cosmochimica Acta, 49, 2469-2491.
• Görür, N. ve Okay, A.l., 1996. A fore-arc origin for the Thrace Basin, NW Turkey: Geol. Rundsch, 85, 662-668.
• Hofmann, A.W., 1988, Chemical differentiation of the Earth: the relationship between mantle, Continen- tal crust, and oceanic crust: Earth Planet Sci. Let- ter, 90, 297-314.
• Irvine, T.N. ve Baragar, W.R.A., 1971, A guide to the Che- mical Classification of the common volcanic rocks: Can. Jour. Earth Science, 8, 523-548.
• Jagoutz, E.; Palme, H.; Baddenhausen, H.; Blum, K.: Cendales, M.; Dreibus, G.; Spettel, B.; Lorenz, V. ve Wanke, H., 1979, The abundances of majör, minör and trace elements in the Earth's mantle as derived from primitive ultramafic nodules. Proce- edings of the 10 th Lunar and Planetary Science Conference: New York, Pergamon, pp. 2031- 2050.
• Jaques, A.L. ve Green, D.H., 1980, Anhydrous melting of peridotite at 0-15 kbar pressure and the genesis of tholeiitic basalts: Contrib. Mineral. Petrol., 73, 287- 310.
• Kopp, K.O.; Pavoni, N. ve Schindler, C., 1969, Geologie Thrakiens IV: Das Ergene Becken. Beihefte Geol. Jayhrbuch, Heft. 76: 136 p.
• Krauskopf, K.B., 1979, Introduction to Geochemistry. (2nd ed.), Mc Graw-HİII Comp: London, pp. 617.
• Kuno, H., 1960, High-alumina basalt. Journal of Petro- logy, l, 121-145.
• Kushiro, l., 1969, Discussion of the paper "The origin of basaltic and nephelinic magmas in the earth's mantle" by D.H. Green. Tectonophysics, 7, 427- 436.
• Lebküchner, R.F., 1974, orta Trakya Oligoseninin Jeoloji- si hakkında. MTA Derg., 83, 1-29.
• Le Maitre, R.W.; Bateman, P.; Dudek, A.; Keller, J.; La- meyre Le Bas, M.J.; Sabine, P.A.; Schmid, Soren- sen, H.; Streckeisen, A.; Wooley, A.R. ve Zanettin, B., 1989, A Classification of igneous rocks and glossary of terms. Recom. of the Int. Union of Ge- ol. Sci. Subcom. of the sys. of igneous Rocks. Blackwell Sci. Publication, pp. 193.
• Maaloe, S. ve Aoki, K., 1977, The majör element compo- sition of the mantle estimated from the compositi- on of Iherzolites: Contrib. Mineral, and Petrol., 63, 161-173.
• Mcdonald, G.A. ve Katsura, J., 1964, Chemical composi- tion of Hawaiian lavaş: Journal of Petrology, 5, 82- 133.
• Mc Donough, W.F., 1990, Constraints on the composition of the Continental lithospheric mantle: Earth and Planetary Science Letters, 101, 1-18.
• Mercier, J-C.C. ve Nicolas, A., 1975, Textures and fabrics of upper mantle peridotites as illustrated by xeno- liths from basalts: Journal of Petrology, 16, 454- 487.
• Meschede, M., 1986, A method of discriminating between different types of mid-ocean ridge basalts and Continental tholeiites with the Nb-Zr-Y diagram: Chemical Geology, 56, 207-218.
• Morgan, P. ve Burke, K., 1985, Collisional Plateaus: Tec- tonophysics, 119, 137-151.
• Mysen, B.O. ve Kushiro, L, 1977, Compositional variation of coexsting phases with degree of partial melting of peridotite in the upper mantle: Am. Mineral., 62, 843-865.
• Nickel, K.G. ve Green, D.H., 1984, The nature of the up- per-most mantle beneath Victoria, Australia, as deduced from ultramafic xenoliths. In Kimberlites II (ed: J. Kornprobet), The Mantle and Crust-Mant- le Relationships: Amsterdam: Elsevier, pp. 161- 178.
• Nicolas, A. ve Jackson, E.D., 1972, Repartition en deux provinces des peridotites des chaines alpines lon- geant la Mediterranee. implications tectoniques: Schweiz. Miner. Petrogr. Mitt., 53, 385-401.
• Nielson Pike, J.E. ve Schwarzman, E.C., 1977, Classifica- tion of textures in ultramafic xenoliths: Journal of Geology, 85, 49-61.
• Parejas, Ed., 1939, Trakya linyitleri jeolojik etüdü, Uzun- köprü, Keşan, Malkara, Hayrabolu mıntıkası: MTA Rap., 981 (yayımlanmamış), Ankara.
• Pearce, J.A., 1976, Statistical analyses of majör element pattern in basalts: Journal of Petrology, 17/1, 15- 43.
• ve Cann, J.R., 1973, Tectonic setting of basic vol- canic rocks determined using trace element analy- ses: Earth and Planet. Sc. Lett., 19, 290-300.
• Perinçek, D., 1987, Trakya Havzası renç fay zonunun sis- mik özellikleri: Türkiye 7. Petrol Kongresi. 11-21.
• Preb, S.; Witt, G.; Seck, H.A.; Lonov, D.A. ve Kovalenko, V.I., 1986, Spinel peridotite xenoliths from the Ta- riat Depression/Mongolia: 1. Majör element che- mistry and Mineralogy of a primitive mantle xeno- lith süite, Geochim. Cosmochim. Acta, 50, 2587- 2599.
• Qi, Q.; Taylor, L.A. ve Zhou, X., 1995, Petrology and ge- ochemistry of mantle peridotite xenoliths from SE China: Journal of Petrology, 36, 55-75.
• Song, Y. ve Frey, F.A., 1989, Geochemistry of peridotite xenoliths in basaltfrom Hannuoba, Eastern China: implications for subcontinental mantle heteroge- neity: Geochimica et Cosmochimica Acta,53, 97- 113.
• Sun, S.S., 1982, Chemical composition and origion of the Earth's primitive mantle: Geochimica et Cosmchi- mica Acta, 46, 179-192.
• Sümengen, M.; Terlemez, L; Şentürk, K.; Karaköse, C.; Erkan, E.N.; Ünay, E.; Gürbüz, M. ve Atalay, Z., 1987, Gelibolu Yarımadası ve Güneybatı Trakya Tersiyer havzasının stratigrafisi, sedimentolojisi ve tektoniği: MTA Rap. 8128 (yayımlanmamış), Ankara.
• Sweeney, R.J.; Duncan, A.R. ve Erlank, A.J., 1994, Geoc- hemistry and Petrogenesis of Central Lebombo basalts of the Karoo igneous province: Journal of Petrology, 35,95-125.
• Tapırdamaz, M.C. ve Yaltırak, C., 1997, Trakya'da Seno- zoyik volkaniklerinin paleomanyetik özellikleri ve bölgenin tektonik evrimi: MTA Derg., 119, 27-42.
• Ternek, Z., 1949, Geological study of the region Keşan- Korudağ: Doktora Tezi, istanbul Üniv. Fen Fakül- tesi, 78 s.
• Turekian, K.K.; Zeeman, J.; Shaw, D.M. ve Correns, C.W., 1969, Handbook of geochemistry: Springer- Verlag, Berlin.
• Umut, M., 1988, a, Kırklareli-C4 paftası izahnamesi: MTA Gen. Müd., 1: 100.000 ölçekli açınsama nitelikli Türkiye Jeoloji Haritaları Serisi, Ankara.
• , 1988, b, Kırklareli-C5 paftası izahnamesi: MTA Gen. Müd., 1: 100.000 ölçekli açınsama nitelikli Türkiye Jeoloji Haritaları Serisi, Ankara.
• , Kurt, Z. ve imik, M., 1983, Tekirdağ ili-Silivri (is- tanbul)-Pınarhisar (Kırklareli) alanının Jeolojisi: MTA Rap., 7349 (yayımlanmamış), Ankara.
• , imik, M.; Kurt, Z.; Özcan, i.; Ateş, M.; Karabıyı- koğlu, M. ve Saraç, G., 1984, Edirne ili-Kırklareli ili-Lüleburgaz (Kırklareli ili)-Uzunköprü (Edirne ili)
• civarının jeolojisi: MTA Rap., 7604 (yayımlanma- mış), Ankara.
• Wedepohl, K.H., 1975, The contribution of Chemical data to assumption about the origin of the magma from the mantle: Forschr. Miner., 52, 141-172.
• Wiechert, U.; Lonov, D.A. ve Wedepohl, K.H., 1997, Spi- nel peridotite xenoliths from the Atsagin-Dush vol- cano, Dariganga lava ylateau, Mongolia: a record of partial melting and cryptic metasomatism in the upper mantle: Contrib. Mineral. Petrol., 126, 345- 364.
• Winchester, J.A. ve Floyd, P.A., 1977, Geochemical disc- rimination of different magma series and their dif- ferentiation products using immobile elements: Chemical Geology, 20, 325-343.
• Yaltırak, C., 1996, Ganos fay sisteminin tektonik tarihi: Türkiye Petrol Jeol. Der. Bült., 8-1, 137-150.
• Yılmaz, Y. ve Polat, A., 1998, Geology and evolution of the Thrace Volcanism, Turkey: Acta Volcanologi- ca, 10 (2), 293-303.
• Zindler, A. ve Hart, S., 1986, Chemical geodynamics: An- nu. Rev. Earth. Planet Sci. 14, 493-571.