zet: Kuvaterner yaßlÝ Kula volkanikleri NaÕca baskÝn karakterde olmalarÝna karßÝn nceki diÛer tm BatÝ Anadolu volkanikleri KÕca egemen volkanik kayalardÝr. BatÝ Anadolu iin tek bir rnek olan bu byk miktardaki plato bazaltlarÝnÝn varlÝÛÝ jeokimya sonularÝ ile de desteklenen hÝzlÝ bir manto materyalinin ykselimini ißaret eder. En yaßlÝ Kula volkanikleri, birden fazla lav akÝntÝsÝndan olußan plato bazaltlarÝdÝr. Volkanik aktivitenin baßlangÝcÝnda geniß bir yayÝlÝm sunan bu plato bazaltlarÝ 1. evre plato bazaltlarÝ olarak adlanÝrlar. Birinci evre plato bazaltlarÝ kimi yerde ykselmiß kimi yerlerde aßÝnmÝß ve kimi yerde ise daha gen lavlar ve tortullarca rtlmßlerdir. Plato bazaltlarÝ ile kaplÝ horstlar bazaltlarÝn dayanÝmlÝlÝÛÝdan dolayÝ cok iyi korunmußlardÝr. Blgedeki aÝlma dnemi sresince volkan konilerinin olußumu kesintisiz devam etmißtir. Volkanik aktivitenin son dneminde en gen volkan konileri bir kez daha lav reterek ikinci plato bazaltlarÝnÝ olußturmußlardÝr. Bu iki plato bazalt evresi arasÝnda farklÝ aßÝnma derecelerine sahip 80Õden fazla volkan konisi vardÝr. Kula bazaltlarÝ, BatÝ AnadoluÕda astenosferik mantonun hÝzlÝ ykselmesine tek rnektir ve bu GBÕya hareket eden Ege mikroplakasÝnÝn Afrika zerine bindirme hÝzÝnÝn, Anadolu plakasÝnÝn Afrika zerine bindirme hÝzÝndan daha fazla olmasÝ sebebiyle aÝlmÝß olan bir eßit yatay pencerenin varlÝÛÝna baÛlanabilir.
Abstract: The Quaternary Kula volcanics are Na-dominant in character while all the older volcanic rocks of western Anatolia are generally definitive K-dominant rocks. As a unique example in western Anatolia, the existence of a huge amount of plateau basalts at Kula indicates rapid uplift of mantle material, as confirmed by new geochemical data. Based on our field observations, the oldest Kula volcanics are the plateau basalts with more than one main lava flow. At the beginning of volcanic activity (first-period plateau basalts), this plateau was vast. Subsequently, parts of the first-period plateau basalts were uplifted and partly eroded while other parts were covered by younger lavas, tephra and sediments. The horsts, covered by plateau basalts, are well protected because of their resistance to erosion. During extensional activity, the development of cinder cones continued without hiatus. During the last period of volcanic activity, the youngest craters once again produced lava flows to form the second-period plateau basalts. As a result, there are more than 80 cinder cones with quite different erosional stages between the first and second plateau-basalt periods. The Kula basalts are the only example of rapid uplifting of asthenospheric material in western Anatolia, and are interpreted to form due to the opening of a horizontal slab window as a consequence of the more rapid southwestward movement of the Aegean microplate overriding Africa, with respect to the Anatolian plate
Geotectonic setting and origin of the Youngest Kula volcanics (Western Anatolia) with a new emplacement model.
Agostini S;
2005
Abstract
Abstract: The Quaternary Kula volcanics are Na-dominant in character while all the older volcanic rocks of western Anatolia are generally definitive K-dominant rocks. As a unique example in western Anatolia, the existence of a huge amount of plateau basalts at Kula indicates rapid uplift of mantle material, as confirmed by new geochemical data. Based on our field observations, the oldest Kula volcanics are the plateau basalts with more than one main lava flow. At the beginning of volcanic activity (first-period plateau basalts), this plateau was vast. Subsequently, parts of the first-period plateau basalts were uplifted and partly eroded while other parts were covered by younger lavas, tephra and sediments. The horsts, covered by plateau basalts, are well protected because of their resistance to erosion. During extensional activity, the development of cinder cones continued without hiatus. During the last period of volcanic activity, the youngest craters once again produced lava flows to form the second-period plateau basalts. As a result, there are more than 80 cinder cones with quite different erosional stages between the first and second plateau-basalt periods. The Kula basalts are the only example of rapid uplifting of asthenospheric material in western Anatolia, and are interpreted to form due to the opening of a horizontal slab window as a consequence of the more rapid southwestward movement of the Aegean microplate overriding Africa, with respect to the Anatolian plateI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
