A geophysical approach to the igneous rocks in the Biga Peninsula (NW Turkey) based on airborne magnetic anomalies: geological implications

Abstract

The Biga Peninsula, the complex geological structure of which has attracted intense attention so far, is located in the north-western part of Anatolia, Turkey. The Peninsula is tectonically very important region where different tectonic zones meet and comprises various kinds of sedimentary, metamorphic and igneous rocks. Among these rocks, igneous rocks occupy a considerably amount of areas in the Biga Peninsula and they are mostly associated with geothermal systems and mineral deposits, and therefore they play an important role in the geology of the Peninsula. In this paper, derived results concerning the geological features and subsurface structures of the igneous rocks in the Peninsula are presented based on analyzing the airborne magnetic anomalies. To this end, a MATLAB-based toolkit named as Gravity and Magnetic Interpretation (GMINTERP) that is composed of a set of linked functions in conjunction with a graphical user interface was developed and used for the interpretation of the airborne magnetic anomalies. Some linear transformations and derivative-based techniques were performed to process the potential field data-set and also to help build a general understanding of the geological details. The close agreement between the derived geophysical anomaly maps and the well-known surface geology map of the Biga Peninsula helped us discuss the geological implications of the geophysical traces. This study also indicated that the developed interactive data processing toolkit may assist geological interpretation even in the areas whose subsurface structure is poorly known.

Interpretation of gravity anomalies to delineate some structural features of Biga and Gelibolu peninsulas, and their surroundings (north-west Turkey)

“…Albora, Uçan & Aydoğan, 2007;Ateş, Bilim, Büyüksaraç, & Bektaş, 2008;Ateş, Kayıran, & Sincer, 2003;Aydoğan, 2007; Aydoğan, Elmas, Albora, & Uçan, 2005;Hisarlı & Orbay, 2000;Oruç & Keskinsezer, 2008a;Ulugergerli, Seyitoğlu, Başokur, Kaya, & Dikmen, 2007). However, except for some recently reported works (Ekinci & Yiğitbaş, 2012a, 2012b which have studied the airborne magnetic anomalies of the igneous rocks that occupy a considerable amount of area in the Biga Peninsula and its surrounding, no special geophysical investigation has been yet performed in the entirety of the Biga and Gelibolu peninsulas and their surroundings which focuses on the shallow geological structure of the region. Hence, to fill that gap, we attempted to investigate the shallow subsurface geology and structural features in some detailed framework by interpreting and correlating the gravity anomalies with the geology of the region which is better known now by the recent regional geological projects of Duru, Dönmez, Ilgar, Pehlivan, and Akçay (2012) and Yiğitbaş, Şengün, and Tunç (2014).…”

“…The success of the interpretation of potential field data-sets undoubtedly depends on the selection of the data processing techniques that are proper to the nature of the problem. Consequently, potential field data-sets generally need many processing techniques in order to produce meaningful results which are in accordance with the nature of the geology of the area of interest (Ekinci & Yiğitbaş, 2012b, 2012c. Numerous commercial software packages (e.g.…”

“…Therefore, an efficient toolkit named as Gravity and Magnetic Interpretation (GMINTERP) that performs numerous analysing techniques was developed and used for processing the gravity data-set of the Biga and Gelibolu peninsulas, and their surroundings. A brief overview of the developed toolkit was previously given by Ekinci and Yiğitbaş (2012b). Before the real gravity data analyses, a large number of synthetic simulations were implemented with success, indicating the reliability of the GMIN-TERP software.…”

“…Before the real gravity data analyses, a large number of synthetic simulations were implemented with success, indicating the reliability of the GMIN-TERP software. The MATLAB-based interactive toolkit which consist of a set of linked functions in conjunction with a graphical user interface (Ekinci, 2010a;Ekinci & Yiğitbaş, 2012b, 2012c produced some noteworthy anomaly maps from the gravity data-set of the study area and we discussed the geological implications of those derived gravity signatures.…”

Metaheuristics in applied geophysics

“…Manyetik araştırmalar, arkeolojik prospeksiyon gibi küçük ölçekli araştırmalardan [15]- [17] farklı manyetik özelliklere sahip kayaçların sınırlarının belirlenmesi gibi büyük ölçekli araştırmalara uzanan geniş bir yelpazeye sahiptir [18]- [20]. GPR yeraltının elektriksel özelliklerinin araştırılmasında kullanılan girişimsel olmayan (noninvasive) bir tekniktir.…”