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首页> 外文期刊>Geodinamica Acta >Age and Chemistry of Miocene Volcanic. Rocks from the Kiraz Basin of the Kucuk Menderes Graben: Its Significance for the Extensional Tectonics of Southwestern Anatolia, Turkey'
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Age and Chemistry of Miocene Volcanic. Rocks from the Kiraz Basin of the Kucuk Menderes Graben: Its Significance for the Extensional Tectonics of Southwestern Anatolia, Turkey'

机译：中新世火山的年龄和化学。库库克·曼德雷斯·格拉本（Kucuk Menderes Graben）的基拉兹盆地的岩石：对土耳其西南安那托利亚伸展构造的意义

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摘要

Neogene volcanic rocks and granitoid plutons are among the most important geological components of western Turkey. Although they are voluminous north of the Gediz Graben, they are very scarce to the south, where volcanic rocks occur as isolated small exposures in a small number of localities. The Kiraz Basin of the Kucuk Menderes Graben is a key locality, in which Tertiary volcanic rocks crop out at three locations. These rocks have been chemically analysed and dated (Ar-39-Ar-40 whole rock and biotite analyses) in order to understand their tectonic setting of emplacement and its relation to the wider structure of western Anatolia. Whole rock and biotite Ar-39-Ar-40 ages vary between 13.9 +/- 0.2 Ma and 14.6 +/- 0.2 Ma. The Kiraz volcanic rocks are calc-alkaline, with a compositional range from basaltic andesite to dacite. They are strongly enriched in the light ion lithophile elements (LILE) and have chemistries typical of lavas erupted in subduction-related settings. Their close association with rift-bounding faults suggests eruptions via conduits flanking grabens in an extensional environment. The difference in chemical composition and age between the Kiraz volcanic rocks and the slightly older calc-alkaline volcanic rocks north of the Gediz Graben is attributed to their relatively younger ages and greater proximity to the Aegean Arc. Their calc-alkaline chemistry reflects magma generation influenced by the slab descending beneath this arc and eruption/emplacement in an extensional setting.
机译：新近纪火山岩和花岗岩类岩体是土耳其西部最重要的地质组成部分。尽管它们位于格迪兹·格拉本（Gediz Graben）北部，但南部却非常稀少，在南部，火山岩是在少数地方以孤立的小暴雨形式出现的。 Kucuk Menderes Graben的Kiraz盆地是一个重要地区，第三纪火山岩在三个位置播出。对这些岩石进行了化学分析和过时（Ar-39-Ar-40整个岩石和黑云母分析），以了解它们的构造构造背景及其与西安纳托利亚西部广泛结构的关系。整个岩石和黑云母Ar-39-Ar-40的年龄在13.9 +/- 0.2 Ma和14.6 +/- 0.2 Ma之间。基拉兹火山岩是钙碱性的，其组成范围从玄武岩安山岩到菊红岩。它们富含轻离子亲石元素（LILE），并具有与俯冲有关的环境中喷发的典型熔岩化学。它们与裂谷边界断层的密切联系表明，在伸展环境中，通过侧翼grab锁的导管爆发。基拉兹火山岩和格迪兹格拉本以北稍老的钙碱性火山岩之间化学成分和年龄的差异，是由于它们的年龄相对较小，并且更接近爱琴海弧。他们的钙碱性化学物质反映了岩浆的生成，该岩浆的生成受板在该弧线以下下降以及在伸展环境下的喷发/侵位的影响。

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