希腊基克拉迪斯Folegandros拆离系统下中新世韧性减薄

IF 2.2 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Terra Nova Pub Date : 2023-02-17 DOI:10.1111/ter.12646

C. Bakowsky, D. Schneider, B. Grasemann, K. Soukis

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引用次数: 2

摘要

Folegandros岛位于已建立的西南向西基克拉迪和南向圣托里尼分离系统之间。保留剪切感指标与相反的运动学，地球动力学和运动学的时间进行了辩论。利用40Ar/39Ar白云母年代学资料，结合构造资料，我们报道了一个新的中新世顶- S滑脱体系——Folegandros滑脱体系(FDS)，该滑脱体系与纯剪切压平相结合，并置了早白垩世至早始新世的基克拉底蓝片岩单元和低品位大理岩和石英-千粒岩层序，顶部为变质裂解。年代地层对比和碎屑锆石年代学表明，FDS上盘的低品位岩石可能属于Pelagonian带。中新世中锆石和磷灰石(U‐Th)/He冷却年龄对应于发掘的最新阶段。对Sikinos, Ios和现在的Folegandros的相反运动学观察表明，韧性变薄在基克拉迪群岛南部中新世高压岩石的发掘中发挥了比以前假设的更重要的作用。

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Miocene ductile thinning below the Folegandros Detachment System, Cyclades, Greece

Folegandros island lies between the established SW‐directed West Cycladic and S‐directed Santorini detachment systems. Preserving shear‐sense indicators with opposing kinematics, the geodynamics and timing of kinematics are debated. Using white mica 40Ar/39Ar geochronology complemented by structural data, we report a new Miocene top‐to‐S detachment system, the Folegandros Detachment System (FDS), that is coupled with pure‐shear flattening and juxtaposes the Cycladic Blueschist Unit below Early Cretaceous to early Eocene low‐grade marble and quartzitic‐phyllitic sequences, topped by a metaflysch. Chronostratigraphic correlation and detrital zircon geochronology reveal the low‐grade rocks from the hanging wall of the FDS likely belong to the Pelagonian Zone. Middle Miocene zircon and apatite (U‐Th)/He cooling ages correspond to the latest stages of exhumation. Observations of opposing kinematics on Sikinos, Ios and now Folegandros reveal that ductile thinning played a more significant role in accommodating Miocene exhumation of high‐pressure rocks in the southern Cyclades than previously postulated.

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来源期刊

Terra Nova 地学-地球科学综合

CiteScore

4.80

自引率

8.30%

发文量

审稿时长

2.3 months

期刊介绍： Terra Nova publishes short, innovative and provocative papers of interest to a wide readership and covering the broadest spectrum of the Solid Earth and Planetary Sciences. Terra Nova encompasses geology, geophysics and geochemistry, and extends to the fluid envelopes (atmosphere, ocean, environment) whenever coupling with the Solid Earth is involved.