Biga Yarımadası’ndaki Kirazlı bölgesinde potansiyel porfiri bakır mineralizasyonunun belirlenmesi: Kısa dalga kızılötesi (SWIR) spektrometrisi çalışması

Öz

Kirazlı maden bölgesi, Biga yarımadasının metalojenik kuşağının merkezinde, genişlemeli tektonik ortamda oluşmuştur. Bölge, büyük ölçekli bir hidrotermal alterasyon içinde yer alan toplam rezervi 33,86 Mt @ 0,69 g/t Au ve 9,42 g/t Ag olan yüksek sülfidasyonlu (HS) epitermal bir cevher kütlesine ev sahipliği yapmaktadır. İdeal magmatik-hidrotermal modeller, HS-epitermal ve porfiri bakır yataklarının mekansal ve zamansal ilişkisini sunsa da, Kirazlı'daki porfiri bakır cevherleşmesi potansiyeli henüz değerlendirilmemiştir. Bu nedenle, SWIR spektroskopisi yardımıyla mineral bazlı alterasyon haritalaması gerçekleştirilmiştir. Çalışmamız dokuz farklı mineral zonunun ayırt edildiğini ve haritalandığını göstermektedir: (1) Silisleşme, (2) Alunit, (3) Kaolinit, (4) Dikit, (5) İllit, (6) Pirofilit, (7) Klorit, (8) Serisit ve (9) Montmorillonite zonları. Toplu olarak, bu alterasyonlar, Kirazlı ana zonundaki yaygın kaolinit-dikit baskın alterasyon içinde, merkezi masif silisleşmeden, KB-GD yönlü alünit ve marjinal montmorillonit-illit zonlarına kadar bir zonlanma modeli sergilemektedir. Kirazlı bölgesinin güneydoğu’sunda ise pirofilit ve serisit minerallerinin hakim olması sıcaklık artışını ifade ederek potansiyel bir porfiri bakır cevherleşmesini işaret eder. Takibinde yapılan sondaj çalışmaları, bölgedeki porfiri bakır mineralizasyonunun potansiyelini doğrulamaktadır.

Anahtar Kelimeler

• Alterasyon
• SWIR
• Porfiri Cu
• Yüksek Sülfidasyon
• Kirazlı
• Biga Yarımadası

IDENTIFYING POTENTIAL PORPHYRY CU MINERALIZATION AT THE KIRAZLI DISTRICT IN BIGA PENINSULA (NW TURKEY): INSIGHTS FROM THE MAPPING HYDROTHERMAL ALTERATION BY USING SHORTWAVE INFRARED (SWIR) SPECTROMETRY

Öz

The Kirazlı mineral district is located at the center of the Biga peninsula metallogenic province, in a geological setting characterized by an extensional tectonic environment. The district hosts a high-sulfidation (HS) ore body with a total reserve of 33.86 Mt @ 0.69 g/t Au and 9.42 g/t Ag within a large-scale hydrothermal alteration. Although the ideal magmatic-hydrothermal models present the spatial and temporal association of HS-epithermal and porphyry Cu deposits, the porphyry Cu potential at the Kirazlı has not been evaluated, yet. Therefore, the mineral-based alteration mapping with the help of SWIR reflectance spectroscopy was carried out. Our study demonstrates that nine different mineral zone have been distinguished and mapped: (1) Silicification, (2) Alunite, (3) Kaolinite, (4) Dickite, (5) Illite, (6) Pyrophyllite, (7) Chlorite, (8) Sericite, and (9) Montmorillonite zones. Collectively, these alterations exhibit a zoned pattern, from central massive silicification to residual silica, NW-SE oriented alunite, and marginal montmorillonite-illite zones within widespread kaolinite – dickite dominated alteration in Kirazlı main zone. The occurrence of pyrophyllite and sericite dominates at the SE of the Kirazlı district, which refers to relative temperature increase. Subsequent drilling confirms the potential for deep prospecting of porphyry Cu mineralization in the region.

Anahtar Kelimeler

• Alteration
• SWIR
• Porphyry Cu
• High Sulfidation
• Kirazlı
• Biga Peninsula

Kaynakça

1. Thompson, A.J.B., Hauff, P.L. and Robitaille, A.J., “Alteration mapping in exploration: application of shortwave infrared (SWIR) spectroscopy”, Society of Economic Geologists Newsletter, 39, 16–27, 1999.
2. Pontual, S., Merry, N. and Gamson, P., “Spectral interpretation field manual”, G-MEX: Arrowtown, New Zealand, AusSpec International Pty. Ltd., Unpublished manual, 168 p., 1997.
3. Mathieu, M., Roy, R., Launeau, P., Cathelineau, M., Quirt, D., “Alteration mapping on drill cores using a HySpex SWIR-320m hyperspectral camera: application to the exploration of an unconformity-related uranium deposit (Saskatchewan, Canada)”, Journal of Geochemical Exploration, 172, 71–88, 2017.
4. Testa, F.J., Villanueva, C., Cooke, D.R., Zhang, L.J., “Lithological and hydrothermal alteration mapping of epithermal, porphyry and tourmaline breccia districts in the argentine Andes using ASTER imagery”, Remote Sensing, 10, 203, 2018.
5. Huang, J., Chen, H., Han, J., Deng, X., Lu, W., Zhu, R., “Alteration zonation and short wavelength infrared (SWIR) characteristics of the Honghai VMS Cu-Zn deposit, Eastern Tianshan, NW China”, Ore Geology Reviews, 100, 263–279, 2018.
6. Zhou, Y., Li, L.M., Yang, K., Xing, G.F., Xiao, W.J., Zhang, H.L., Xiu, L.C., Yao, Z.Y., Xie, Z.J., “Hydrothermal alteration characteristics of the Chating Cu-au deposit in Xuancheng City, Anhui Province, China: significance of sericite alteration for Cu- au exploration”, Ore Geology Reviews, 127, 103844, 2020.
7. Zhou, Y., Chen, S., Li, L., Fan, F., Zhang, H., Chen, J., Yang, K., Xiu, L., Xu, M., & Xing, G., “Mapping hydrothermal alteration of the Au-Cu deposits in the Zhenghe magmatic-hydrothermal mineralization system, SE China, using Short Wavelength Infrared (SWIR) reflectance spectroscopy” Journal of Geochemical Exploration, 244, 107113, 2023.
8. Sönmez, Ş.U., Kuşcu, İ. “Geology, geochemistry, geochronology and genesis of the late Miocene porphyry Cu-Au-Mo mineralization at Afyon-Sandıklı (AS) prospect, western Anatolia, Turkey, Ore Geology Reviews, 121, 2020.

9. Zadeh, M.H., Tangestani, M.H., Roldan, F.V., Yusta, I., “Spectral characteristics of minerals in alteration zones associated with porphyry copper deposits in the middle part of Kerman copper belt, SE Iran”, Ore Geology Reviews, 62, 191–198, 2014.
10. Li, Y., Su, C., Wang, X., Huang, Z., Zhang, X., “Extraction of alteration information and establishment of prospecting model for porphyry copper-gold deposits in Luzon”, Remote Sensing Technology and Application, 6, 1151–1160, 2017.
11. Sillitoe, R.H., “Porphyry Copper Systems*”, Economic Geology, 105, 3–41, 2010.
12. Kuşcu, İ., Tosdal, R. M., and Gençalioğlu-Kuşcu, G., “Episodic porphyry Cu (-Mo-Au) formation and associated magmatic evolution in Turkish Tethyan collage”. Ore Geology Reviews, 107, 119-154, 2019.
13. Okay, A. I., and Tüysüz, O., “Tethyan sutures of northern Turkey”, Geological Society, London, Special Publications, 156(1), 475, 1999.
14. Yigit, O., “A prospective sector in the Tethyan Metallogenic Belt: Geology and geochronology of mineral deposits in the Biga Peninsula, NW Turkey”, Ore Geology Reviews, 46, 118-148, 2012.
15. Brunetti, P., Magmatic-hydrothermal evolution and post-ore modifications of the Halilağa porphyry Cu-Au deposit, NW Turkey, University of British Columbia, Vancouver, Canada 2016.
16. Leroux, G., M., Stratigraphic and petrographic characterization of HS epithermal Au-Ag mineralization at the TV Tower district, Biga Peninsula, NW Turkey, University of British Columbia, Vancouver, Canada, 2016.
17. Sánchez, M. G., McClay, K. R., King, A. R., and Wijbrams, J. R. (Editor, J. P. Richards ), “Cenozoic Crustal Extension and Its Relationship to Porphyry Cu-Au-(Mo) and Epithermal Au-(Ag) Mineralization in the Biga Peninsula, Northwestern Turkey”, Tectonics and Metallogeny of the Tethyan Orogenic Belt (Vol. 19), 2016.
18. Aluç, A., Kuşcu, I., Ulianov, A., Selby, D., Antoine, C., Spikings, R., and Moritz, R., “Protracted metallogenic and magmatic evolution of the epithermal Au-Ag and porphyry Cu deposits at the Kirazlı district, Biga Peninsula, NW Turkey: Evidence from zircon U-Pb, muscovite 40Ar/39Ar, and molybdenite Re-Os geochronology”, Mineralium Deposita, in press.
19. Cormier, A., Jutras, M., Welhener, H., Minard, T., Chiaramello, P., Cremeens, J., NI 43-101 Technical Report Feasibility Study Technical Report on the Kirazlı Project, Çanakkale Province, Turkey, 2017.
20. Smith, M., T., Lepore, W., A., Incekaraoğlu, T., Shabestari, P., Boran, H., Raabe, K., “Küçükdağ: A New, High Sulfidation Epithermal Au-Ag-Cu Deposit at the TV Tower Property in Western Turkey”, Economic Geology, 109(6), 1501–1511, 2014.
21. ASD TerraSpec 4 Hi-Res mineral analyzer Specifications, 2023, Retreived from: https://www.malvernpanalytical.com/en/assets/PN13063_BR_ASD%20Terraspec%204%20Hi%20Res%20brochure_EN_tcm50-61713.pdf.
22. Yang, K., Whitbourn, L., Mason, P., Huntington, J., “Mapping the chemical composition of nickel laterites with reflectance spectroscopy at Koniambo, New Caledonia”, Economic Geology, 6, 1285–1299, 2013.
23. Okay, A.I., Satir, M., “Coeval plutonism and metamorphism in a latest Oligocene metamorphic core complex in northwest Turkey” Geological Magazine, 137(5), 495–516, 2000.
24. Bonev, N., Beccaletto, L., “From syn- to post-orogenic Tertiary extension in the north Aegean region: constraints on the kinematics in the eastern Rhodope–Thrace, Bulgaria–Greece and the Biga Peninsula, NW Turkey”, Geological Society, London, Special Publications, 291(1), 113-142, 2007.
25. McKenzie, D., “Active tectonics of the Alpine—Himalayan belt: the Aegean Sea and surrounding regions”, Geophysical Journal International, 55(1), 217-254, 1978.
26. Le Pichon, X., Angelier, J., “The Hellenic arc and Trench System: Akey to the Neotectonic Evolution of the Eastern Mediterranean”, Tectonophysics, 60, 1- 42, 1979.
27. Şengör, A.M.C., Yılmaz, Y., “Tethyan Evolution of Turkey” Tectonophysics, 75, 181-241, 1981.
28. Meulenkamp, J.E., Wortel, M.J.R., Van Wamel, W.A., Spakman, W., Strating, E.H., “On the Hellenic subduction zone and the geodynamic evolution of Crete since the late Middle Miocene”, Tectonophysics, 146(1-4), 203-215, 1988.
29. Harris, N.B.W., Kelley, S., Okay, A.I., “Post-collision magmatism and tectonics in northwest Anatolia”, Contributions to Mineralogy and Petrology, 117(3), 241-252, 1994.
30. Sherlock, S., Kelley, S., Inger, S., Harris, N., Okay, A. “40Ar/39Ar and Rb-Sr geochronology of high-pressure metamorphism and exhumation history of the Tavsanli Zone, NW Turkey. Contributions to Mineralogy and Petrology, 137(1), 46-58, 1999.
31. Önen, H., “Sub-ophiolite metamorphic rocks from NW Anatolia, Turkey”, Journal of Metamorphic Geology, 18(5), 483-495, 2000.
32. Dilek, Y., Altunkaynak, Ş. “Cenozoic crustal evolution and mantle dynamics of post-collisional magmatism in western Anatolia”, International Geology Review, 49(5), 431-453, 2007.
33. Altunkaynak, Ş., Genç, Ş.C. “Petrogenesis and time-progressive evolution of the Cenozoic continental volcanism in the Biga Peninsula, NW Anatolia (Turkey)”, Lithos, 102(1), 316-340, 2008.
34. Bozkurt, E., “Granitoid rocks of the southern Menderes Massif (southwestern Turkey): field evidence for Tertiary magmatism in an extensional shear zone”, International Journal of Earth Sciences, 93(1), 52-71, 2004.
35. Cunningham-Dunlop I.R., Lee, C., ”Technical Report on Kirazli Gold Property, Canakkale Province, Turkey, 2007.
36. Hunt, G.R., Ashley, R.P., “Spectra of altered rocks in the visible and near infrared” Economic Geology, 74(7), 1613-1629, 1979.
37. Chang, Z., Yang, Z., “Evaluation of inter-instrument variations among short wavelength infrared (SWIR) devices”, Economic Geology, 107(7), 1479-1488, 2012.
38. Neal, L.C., Wilkinson, J.J., Mason, P.J., Chang, Z., “Spectral characteristics of propylitic alteration minerals as a vectoring tool for porphyry copper deposits. Journal of Geochemical Exploration, 184, 179-198, 2018.