Magnetic susceptibility (SI) measurements and mineralogical and petrographical studies were carried out on the alkaline potassium-rich Gölcük volcanic rocks, situated in the apex of the Isparta Angle in the southwest of Turkey. Magnetic susceptibility was measured on the pyroclastic rocks and outcrops using hand-held KT10-R Magnetic Susceptibility meter. The classification and SI values of the igneous rocks from the study area are as trachyte (SI between 0.45 × 10^–3 and 36.3 × 10^–3), trachyandesite (SI between 0.5 × 10^–3 and 5.7 × 10^–3), Clinopyroxene (Cpx)-phyric basaltic trachyandesite (SI: 36.3 × 10^–3), Clinopyroxene (Cpx)-phyric trachyandesite (SI: 0.63 × 10^–3), alkali feldspar syenite (SI: 20.9 × 10^–3 and 26.4 × 10^–3), syenite (SI: between 16 × 10^–3 and 35.6 × 10^–3), leucocratic monzosyenite (SI: 23.3 × 10^–3), monzosyenite (SI: 31.2 × 10^–3), mafic monzosyenite (SI: 15.4 × 10^–3 and 20.7 × 10^–3), pyroxene monzonite (SI: 0.56 × 10^–3), micaceous pyroxenite (SI: 0.42 × 10^–3), tephriphonolites (SI: between 11.3 × 10^–3 and 3.32 × 10^–3 but most of them between 17 × 10^–3 and 25 × 10^–3). Based on thin-section investigations, it is clearly seen that igneous rocks contain various amount of opaque minerals. X-ray data show that the opaque minerals are mainly magnetite minerals. Petrographical determinations and magnetic susceptibility SI measurements show that igneous rocks with the same composition and texture may have different magnetic susceptibility values and varying amount of magnetite minerals. On the other hand, some of the volcanic rocks with the same composition but different textures have also different magnetic susceptibility values. The presence of opaque minerals is the dominant factor controlling the magnetic susceptibility value of the Gölcük volcanites and the amount of magnetite mineral is directly proportional to the magnitude of the magnetic susceptibility. It is not plausible to suggest that rocks existing in the same classification should have the same magnetic susceptibility values.

对位于土耳其西南部伊斯帕尔塔角顶端的富含碱性钾的 Gölcük 火山岩进行了磁化率 (SI) 测量以及矿物学和岩石学研究。使用手持式 KT10-R 磁化率计测量火山碎屑岩和露头的磁化率。研究区火成岩分类及SI值分别为：粗面岩（SI在0.45×10-3 ^～ 36.3× ^10-3之间）、粗面岩（SI在0.5×10-3 ^～ 5.7×10-3^之间）、单斜辉石(Cpx)-晶质玄武岩粗安岩 (SI: 36.3 × 10 ^–3 )、单斜辉石 (Cpx)-晶质粗安岩 (SI: 0.63 × 10 ^–3）、碱长石正长岩（SI：20.9 × 10 ^–3和 26.4 × 10 ^–3）、正长岩（SI：16 × 10 ^–3和 35.6 × 10 ^–3之间）、淡色二长岩（SI：23.3 × 10 ^–3） 、二长岩（SI：31.2 × 10 ^–3）、镁铁质二长岩（SI：15.4 × 10 ^–3和 20.7 × 10 ^–3）、辉石二长岩（SI：0.56 × 10 ^–3）、云母辉石岩（SI：0.42 × 10 ^–3），硬石（SI：11.3 × 10 ^–3和 3.32 × 10 ^–3之间，但大多数在 17 × 10 ^–3和 25 × 10 ^–3之间）。根据薄片研究，可以清楚地看到火成岩中含有不同数量的不透明矿物。X射线数据显示，不透明矿物主要是磁铁矿矿物。岩相测定和磁化率 SI 测量表明，具有相同成分和结构的火成岩可能具有不同的磁化率值和不同数量的磁铁矿矿物。另一方面，一些成分相同但质地不同的火山岩也有不同的磁化率值。不透明矿物的存在是控制格尔居克火山岩磁化率值的主导因素，磁铁矿矿物的数量与磁化率的大小成正比。