土耳其中部新特提斯-安卡拉-梅拉奇:海洋弧前环境中海山和超俯冲带蛇绿岩的增生形成

IF 1.7 Q3 GEOSCIENCES, MULTIDISCIPLINARY Journal of Asian Earth Sciences: X Pub Date : 2023-01-01 DOI:10.1016/j.jaesx.2023.100151
Alastair H.F. Robertson , Osman Parlak , Kemal Taslı , Paulian Dumitrica , Timur Ustaömer
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引用次数: 0

摘要

新特提斯-安卡拉Melange是碰撞造山带中保存的海洋增生过程的全球参考。在这里,我们根据安卡拉周围的八个代表性露头表明,混杂岩包含主要为晚侏罗纪-早白垩纪的地层连贯的火山沉积序列。我们的研究结果表明,与之前强调其混乱性质的解释相反,混杂岩具有相对有组织的构造地层学。晚侏罗世-早白垩世的相干火山沉积序列被解释为大型海洋海山的侧翼相(可能与羽流有关)及其盖层碳酸盐岩平台(环礁),包括礁相和背礁相。其他海山遗迹的年代为三叠纪晚期-早侏罗世和白垩纪晚期。早侏罗世-中侏罗世晚期的变异肢解超俯冲带蛇绿岩,包括玻安岩,形成于海洋前弧环境中,类似于西北太平洋新生代伊豆-波宁前弧。安卡拉地区的混杂岩在白垩纪早期(阿尔比安之前)因推断的大型海山与海洋(蛇绿质)前弧的碰撞而部分增生。在碰撞期间,近端-远端海山侧翼岩性的俯冲侵蚀片依次增生,而海山核心则俯冲。同样在碰撞过程中,蛇绿前弧的远外侧边缘,主要是地幔方辉橄榄岩,与上层岩石圈分离,并融入混杂岩中。构造证据强调了构造过程(而不是滑变过程)在混杂岩吸积中的重要性。所研究露头中的增生棱镜在晚白垩世被弧形相关沉积物和火山岩覆盖,并在白垩纪-古近纪晚期因碰撞相关过程而变形。
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Neotethyan Ankara Melange, central Turkey: Formation by accretion of seamounts and supra-subduction zone ophiolites in an oceanic fore-arc setting
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来源期刊
Journal of Asian Earth Sciences: X
Journal of Asian Earth Sciences: X Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
3.40
自引率
0.00%
发文量
53
审稿时长
28 weeks
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