Geochronology, geochemistry, and tectonic setting of the Oligocene magmatic rocks (Marmaros Magmatic Assemblage) in Gökçeada Island, northwest Turkey

Geochronology, geochemistry, and tectonic setting of the Oligocene magmatic rocks (Marmaros Magmatic Assemblage) in Gökçeada Island, northwest Turkey
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土耳其西北部 Gököeada 岛渐新世岩浆岩(Marmaros 岩浆组合)的年代学、地球化学和构造环境

DOI:
10.1080/00206814.2016.1227941
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发表时间:
--
影响因子:
2.6
通讯作者:
Schmidt
Schmidt
中科院分区:
地球科学3区
文献类型:
--
作者:
Koralay;Schmidt

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通过伊兹密尔-安卡拉-埃尔津詹和瓦尔达尔洋缝合带,欧亚板块和非洲板块之间的交汇在控制安纳托利亚西北部、爱琴海北部和巴尔干半岛东部的古近纪岩浆活动中发挥了关键作用。对从 Harmankaya 火山岩的凝灰岩中分离出来的锆石上的 U 和 Pb 同位素进行 LA-ICP-MS 测年,得出了晚伊普雷世 (51 Ma) 年龄,这些火山岩与加诺斯断层以北的 Gaziköy 组的中低中始新统沉积物和盖利博卢半岛的 Karaağaç 组相互交错。化学特征表明,哈曼卡亚火山岩的熔岩和凝灰岩是同碰撞或碰撞后岩浆的产物。这些火山岩也表现出与俯冲相关岩浆的密切关系。除了已知的安山质火山岩外,我们在 Gökçeada 岛的实地观察还表明存在花岗岩和流纹岩(马尔马罗斯岩浆组合)。我们的 U-Pb 锆石年龄数据表明,新发现的 Marmaros 花岗岩岩体在渐新世晚期(26 Ma)侵入 Gökçeada 岛 Karaağaç 组的沉积物。对来自 Marmaros 流纹岩的锆石分离物上的 U 和 Pb 同位素进行 LA-ICP-MS 测年,得出渐新世晚期 (26 Ma) 结晶年龄。地球化学特征表明,Marmaros 岩浆组合中演化程度较高的渐新世花岗岩和流纹岩可能比下始新世 Harmankaya 火山岩吸收了更多的地壳物质。地球化学特征和年龄关系表明,在土耳其西北部从始新世早期到渐新世的岩浆演化过程中,地壳污染量不断增加,俯冲特征逐渐减少。岩浆活动是在伊兹密尔-安卡拉-埃尔津詹海洋岩石圈向北俯冲以及萨卡里亚和阿纳托利德-陶里德带之间最早的古新世最终大陆碰撞之后发展起来的。
Through the İzmir–Ankara–Erzincan and the Vardar oceans suture zones, convergence between the Eurasian and African plates played a key role in controlling Palaeogene magmatism in northwestern Anatolia, northern Aegean, and eastern Balkans. LA-ICP-MS dating of U and Pb isotopes on zircon separates from the tuffs of the Harmankaya Volcanic Rocks, which are inter-fingered with the lower-middle Eocene deposits of the Gaziköy Formation to the north of the Ganos Fault and the Karaağaç Formation in the Gelibolu Peninsula, yielded a late Ypresian (51 Ma) age. The chemical characteristics suggest that the lavas and tuffs of the Harmankaya Volcanic Rocks are products of syn- or post-collision magmas. These volcanic rocks show also close affinities to the subduction-related magmas. In addition to the already known andesitic volcanic rocks, our field observations in Gökçeada Island indicate also the existence of granitic and rhyolitic rocks (Marmaros Magmatic Assemblage). Our U–Pb zircon age data has shown that the newly discovered Marmaros granitic plutons intruded during late Oligocene (26 Ma) into the deposits of the Karaağaç Formation in Gökçeada Island. LA-ICP-MS dating of U and Pb isotopes on zircon separates from the Marmaros rhyolitic rocks yielded a late Oligocene (26 Ma) crystallization age. Geochemical characteristics indicate that the more-evolved Oligocene granitic and rhyolitic rock of the Marmaros Magmatic Assemblage possibly assimilated a greater amount of crustal material than the lower Eocene Harmankaya Volcanic Rocks. Geochemical features and age relationships suggest increasing amounts of crustal contamination and a decreasing subduction signature during the evolution of magmas in NW Turkey from the early Eocene to the Oligocene. The magmatic activity developed following the northward subduction of the İzmir–Ankara–Erzincan oceanic lithosphere and the earliest Palaeocene final continental collision between the Sakarya and Anatolide–Tauride zones.
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