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首页> 外文期刊>Journal of Asian earth sciences >Evolution of Neogene calc-alkaline to alkaline volcanism in the Aliaga-Foca region (Western Anatolia, Turkey)
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Evolution of Neogene calc-alkaline to alkaline volcanism in the Aliaga-Foca region (Western Anatolia, Turkey)

机译：Aliaga-Foca地区（土耳其安那托利亚西部）的新近钙碱性转变为碱性火山作用

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In the Foca Region, a complete Miocene volcano-sedimentary succession outcrops. This succession includes a well-developed central volcano gradually interdigitating with flank erruptions and a lacustrine sedimentary succession. The Dumanlidag volcano consists of three laterally and vertically interdigitating rock associations; the Yuntdag volcanics, the Foca volcanics and the Aliaga limestones. The lowermost unit is the Yuntdag volcanics comprising dominantly andesitic and trachyandesitic lava flows, domes and dykes, and interbedded blocky pyroclastic flow deposits. These different facies together form a central volcano with a caldera structure surrounding its summit. The andesitic volcanic succession grades laterally into and is overlain by the rhyolitic Foca volcanics that erupted along the flank of the Dumanlidag volcano and comprise a thick rhyolitic pyroclastic sequence with small rhyolite domes and dykes. In the uppermost parts, the Foca volcanics include sporadic occurrences of alkaline dykes and lavas. This volcanic sequence interfingers laterally with lacustrine sedimentary rocks. The volcanism was calc-alkaline during the formation of the Yuntdag volcanics and controlled by NE-SW-trending, regional-scale weakness zones. Along these fault or fracture zones, three linearly aligned volcanic vents developed. The volcanism was dominated by flank eruptions in the later stages, and both subaerial and lacustrine volcano-sedimentary deposits of the Foca volcanics were formed. During the latest phase, volcanism was bimodal and alkaline trachyandesitic to phonolitic lavas and dykes coevally formed with the calc-alkaline rhyolitic volcanics along NE-SW-trending fracture zones. The flank of the Dumanlidag volcano and extensive areas in western Anatolia were covered by shallow lakes, and widespread lacustrine limestones were deposited. Field studies and geochemical characteristics of the volcanic rocks indicate that the volcanism, tectonic activity and the sedimentary deposition were progressive without any pronounced interruption and were controlled by NW-SE-trending extension throughout the formation of the Miocene succession.
机译：在福卡地区，一个完整的中新世火山沉积相继的露头。该演替包括一个发达的中央火山，逐渐与侧面的火山喷发和湖相沉积的演替相交。杜曼利达（Dumanlidag）火山由三个横向和纵向交指的岩石组合组成。 Yuntdag火山，Foca火山和Aliaga石灰岩。最下部的单元是Yuntdag火山岩，主要为安第斯山脉和曲安迪斯山脉的熔岩流，穹顶和堤坝以及层状块状火山碎屑流沉积物。这些不同的相共同构成了一个中央火山，其顶部环绕着火山口结构。安第斯山脉的火山演替作用在横向上分为杜马利达火山火山侧面喷发的流纹Foca火山，并被其覆盖。在最上部，福卡火山包括偶发的碱性堤坝和熔岩。该火山层序与湖相沉积岩横向接触。在Yuntdag火山形成期间，火山活动是钙碱性的，并受NE-SW趋势，区域规模的薄弱带控制。沿着这些断层或断裂带，形成了三个线性排列的火山喷口。火山活动在后期受到侧翼喷发的支配，同时形成了福卡火山的陆基和湖相火山沉积沉积物。在最近阶段，火山活动是沿NE-SW趋势断裂带与钙碱性流纹岩火山共生形成的双峰和碱性曲安山岩至蛇纹岩熔岩和堤坝。 Dumanlidag火山的侧面和安纳托利亚西部的广大地区被浅水湖泊覆盖，并沉积了广泛的湖相石灰石。火山岩的野外研究和地球化学特征表明，火山活动，构造活动和沉积沉积是渐进的，没有任何明显的中断，并且在整个中新世演替过程中都受到北西向东南向扩展的控制。

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