Year 2008, Volume 137 , Issue 137, Pages 61 - 72 2008-06-01

Some geomorphological features of the Orhaneli Pluton: Implications for denudation history

Ahmet Evren ERGİNAL [1] , Ahmet ERTEK [2]


 

The granitic intrusions of the variable age of cooling, size and mineral composition are widely exposed in the northwest Anatolia, Turkey. The nearly circular Orhaneli Pluton emplaced during the Early Eocene with some 15 km in diameter, is one of such plutonic bodies. Geomorphological features of the pluton are discussed here with special emphasis given on the denudation history. To this end, evidence from two isolated Inselberglike hills as remnants of roof rocks in the centre of the pluton and episodically emergence of granite landforms of etch origin after unroofing process were investigated. Field data reveal the absence of granodiorite clasts within Early to Middle Miocene lacustrine deposits in the north of the pluton, implying that the pluton might not have been exposure prior to Upper Miocene as a whole. After the first exposure, the granite landforms, such as boulders, corestones and tors constituting sound evidence of an etch origin, became exposure by continual removing of regolith cover by surficial runoff. These forms of various scale were formed at first by subsurface weathering and shaped by surficial weathering processes after any stages of removal of the regolith cover. Drainage segments accounted for removal of regolith is mostly structurally controlled defined by NW-SE, NE-SW and N-S-aligned fracture systems.

Differential weathering, Weathering front, Regolith, Orhaneli Pluton, NW Turkey
  • Ataman, G. 1972. Orhaneli granodiyoritik kütlesinin radyometrik Yaşı (L'age radiometrique du massif granodioritique d'Orhaneli). Türkiye Jeoloji Kurumu Bülteni, XV (2), 125-130.
  • Altınlı, E. 1966. Orhaneli havzasının jeoloji ve hidro- jeoloji incelemesi. Istanbul (unpublished report).
  • Bingöl, E., Delaloye, M. and Ataman, G. 1982. Granitic intrusions in western Anatolia: A contribution to the geodynamic study of this area. Eclogae Geol. Helv., 75/2, 437-446.
  • Bürküt, Y. 1966. Kuzeybatı Anadolu'da yer alan plütonların mukayeseli jenetik etüdü (Istanbul Teknik Üniversitesi Maden Fak.Yay. No:272, Istanbul.
  • Chapman, C.A. 1956. The control of jointing by topog- raphy. Journal of Geology, 66, 552-558.
  • Dale, T.N. 1923. The commercial granites of New England. United States Geological Survey Bulletin, 738, 488 p.
  • Delaloye, M. and Bingöl, E. 2000. Granitoids from western and northwestern Anatolia: geoche- mistry and modelling of geodynamic evolution. International Geology Review, 42, 241-268.
  • Emre, H. 1986. Geology and Petrology of the Orhaneli ophiolite. PhD thesis, Istanbul University, Istanbul, Turkey (unpublished).
  • Ercan, T. 1979. Batı Anadolu, Trakya ve Ege adalarındaki Senozoik volkanizması, Jeoloji Mühendisliği Dergisi, 9, 23-46.
  • Ercan, T., Ergül, E., Akçören, F., Çetin, A., Granit, S. and Asutay, J. 1990. Balıkesir-Bandırma arasının jeolojisi, Tersiyer volkanizmasının petrolojisi ve bölgesel yayılımı, Maden Tetkik ve Arama Dergisi, 110, 113-130.
  • Gilbert, G.K. 1904. Domes and dome structures of the High Sierra. Geological Society of America Bulletin, 15, 29-36.
  • Goldish, S.S. 1938. A study in rock-weathering. Journal of Geology, 46, 17-58.
  • Harris, N.B.W., Kelley, S. and Okay, A.I. 1994. Post-collision magmatism and tectonics in northwest Turkey. Contrib. Mineral Petrol., 117, 241-252.
  • Kaaden, V. Der. 1959. Anadolu'nun kuzeybatısında yer alan metamorfik olaylarla magmatik faaliyetler arasındaki yaş münasebetleri, Maden Tetkik ve Arama Enstitüsü Dergisi., 52, 15-34.
  • Loughnan, F.C. 1969. Chemical Weathering of the Silicate Minerals. Elsevier, New York.
  • Mabbutt, J.A. 1961. A stripped land surface in eastern Australia. Trans. & Papers Inst. Brit. Geogr., 29, 101-114.
  • Okay, A.C. 1948. Orhaneli bölgesi, Mustafa Kemalpaşa bölgesi, Çataldağ bölgesine ait izahname 54/2, 54/1, 53/2 paftaları, Maden Tetkik ve Arama Genel Müdürlüğü Rapor No: 2215.
  • Okay, A.I., Harris, N.B.W. and Kelley, S.P. 1998. Exumation of blueschists along a Tethyan suture in northwest Turkey. Tectonophysics, 285, 275-299.
  • Özkoçak, O. 1969. Etude geologie de massif ultraba- zique D'Orhaneli et de sa proche bordure, Bursa-Turquie. Thise, Fac. Sci. Üniv., Paris (unpublished).
  • Twidale, C.R. 1993. The research frontier and beyond: granitic terrains. Geomorphology, 7, 187-223.
  • Twidale, C.R. and Bourne, J.A. 1975. The subsurface initiation of some minor granite landforms. Journal of the Geological Society of Australia, 22, 477- 484.
  • Twidale, C.R., Vidal Romani, J.R., Campbell, E.M. and Centeno, J.D. 1996. Sheet fractures: response to erosional offloading or tectonic stress? Zeitschrift für Geomorphologie Supplement Band, 106, 1-24. and Vidal Romani, J.R. 2004. Identification of exposed weathering fronts. Geodynamica Acta, 17/2, 107-123.
Primary Language en
Subjects Engineering
Journal Section Articles
Authors

Author: Ahmet Evren ERGİNAL (Primary Author)

Author: Ahmet ERTEK

Dates

Publication Date : June 1, 2008

Bibtex @research article { bulletinofmre52421, journal = {Bulletin of the Mineral Research and Exploration}, issn = {0026-4563}, address = {}, publisher = {Maden Tetkik Arama Genel Müdürlüğü}, year = {2008}, volume = {137}, pages = {61 - 72}, doi = {}, title = {Some geomorphological features of the Orhaneli Pluton: Implications for denudation history}, key = {cite}, author = {ERGİNAL, Ahmet Evren and ERTEK, Ahmet} }
APA ERGİNAL, A , ERTEK, A . (2008). Some geomorphological features of the Orhaneli Pluton: Implications for denudation history. Bulletin of the Mineral Research and Exploration , 137 (137) , 61-72 . Retrieved from https://dergipark.org.tr/en/pub/bulletinofmre/issue/3955/52421
MLA ERGİNAL, A , ERTEK, A . "Some geomorphological features of the Orhaneli Pluton: Implications for denudation history". Bulletin of the Mineral Research and Exploration 137 (2008 ): 61-72 <https://dergipark.org.tr/en/pub/bulletinofmre/issue/3955/52421>
Chicago ERGİNAL, A , ERTEK, A . "Some geomorphological features of the Orhaneli Pluton: Implications for denudation history". Bulletin of the Mineral Research and Exploration 137 (2008 ): 61-72
RIS TY - JOUR T1 - Some geomorphological features of the Orhaneli Pluton: Implications for denudation history AU - Ahmet Evren ERGİNAL , Ahmet ERTEK Y1 - 2008 PY - 2008 N1 - DO - T2 - Bulletin of the Mineral Research and Exploration JF - Journal JO - JOR SP - 61 EP - 72 VL - 137 IS - 137 SN - 0026-4563- M3 - UR - Y2 - 2020 ER -
EndNote %0 Maden Tetkik ve Arama Dergisi Some geomorphological features of the Orhaneli Pluton: Implications for denudation history %A Ahmet Evren ERGİNAL , Ahmet ERTEK %T Some geomorphological features of the Orhaneli Pluton: Implications for denudation history %D 2008 %J Bulletin of the Mineral Research and Exploration %P 0026-4563- %V 137 %N 137 %R %U
ISNAD ERGİNAL, Ahmet Evren , ERTEK, Ahmet . "Some geomorphological features of the Orhaneli Pluton: Implications for denudation history". Bulletin of the Mineral Research and Exploration 137 / 137 (June 2008): 61-72 .
AMA ERGİNAL A , ERTEK A . Some geomorphological features of the Orhaneli Pluton: Implications for denudation history. Bull.Min.Res.Exp.. 2008; 137(137): 61-72.
Vancouver ERGİNAL A , ERTEK A . Some geomorphological features of the Orhaneli Pluton: Implications for denudation history. Bulletin of the Mineral Research and Exploration. 2008; 137(137): 72-61.