探索俯冲系统前弧的上升机制:将卡尔帕索斯岛作为横跨东希腊边缘的自然横断面

IF 3.3 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Tectonics Pub Date : 2024-08-21 DOI:10.1029/2023tc008156
Violeta Veliz-Borel, Vasiliki Mouslopoulou, Johannes Glodny, John Begg, Sabrina Metzger, Dimitris Sakellariou, Onno Oncken
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引用次数: 0

摘要

成套的海洋阶地、沉积物和古海岸线常见于世界各地的弧前地区。一个普遍的假设是,地壳隆升阻止了这些地貌受到沿岸侵蚀。在这里,我们研究了东地中海卡尔帕索斯(Karpathos)的垂直变形,该岛是一个弧前岛屿,其长轴与希腊俯冲系统(HSS)的走向呈高角度延伸。我们以该岛沿岸的三个主要沿海地点为目标,讨论垂直运动的时空变化。我们为每个地点绘制了多达 19 块海洋阶地,海拔高度从 1.5 到 350 米不等。阶地和沉积物的年龄是通过放射性碳(31 海拔)和锶同位素(2-310 海拔)测年确定的,范围从 2.4 ka 到 4.3 Ma。数据分析显示,较短(⪅100 ka)时间尺度的平均隆升速度比较长(⪆100 ka)时间尺度的平均隆升速度快两个数量级,这与其他地方和全球数据集一致。此外,我们还发现了晚更新世阶地多次被海洋重占的证据,这表明碳酸盐海滩岩通常能够抵御与海平面的多次相互作用。见证较长时期(4 千兆年)的新近纪海洋序列显示出交替垂直运动的迹象。利用这一新数据集,我们探讨了各种机制(即上板正断层、扩张-推覆断层、基底下伏)对垂直变形时空模式的影响。尽管我们无法确定每种机制对净垂直变形的贡献,但我们的结果表明,任何一种机制都无法单独解释观测结果。
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Exploring Uplift Mechanisms Across the Forearc of a Subduction System: Karpathos Island as a Natural Transect Across the Eastern Hellenic Margin
Sets of marine terraces, sediments, and paleoshorelines are commonly found in forearc regions worldwide. A common assumption holds that crustal uplift prevents these features from littoral erosion. Here, we study the vertical deformation of Karpathos, a forearc island in the eastern Mediterranean, whose long axis extends at a high angle to the strike of the Hellenic Subduction System (HSS). We target three key coastal localities along the island to discuss spatial and temporal variability of vertical motion. We mapped sets of up to 19 marine terraces per locality, with elevations ranging from 1.5 to ∼350 masl. Ages for terraces and sediments are constrained by radiocarbon (<31 masl) and Sr-isotope (2–310 masl) dating, and range from 2.4 ka to ∼4.3 Ma. Data analysis shows that average uplift rates are up to two orders of magnitude faster over shorter (⪅100 ka) than longer (⪆100 ka) timescales, in agreement with other local and global data sets. Further, we find evidence for multiple marine reoccupations of late Pleistocene terraces, indicating that carbonate beachrock is often resistant to multiple interactions with sea-level. Neogene marine sequences that witness longer periods (∼4 Ma) show signs of alternating vertical motion. Using this novel data set, we explore the effects of various mechanisms (i.e., upper-plate normal faulting, splay-thrust faulting, basal underplating) on the spatial and temporal patterns of vertical deformation. Although the contribution of each mechanism to the net vertical deformation cannot be isolated with certainty, our results show that none alone could account for the observations.
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来源期刊
Tectonics
Tectonics 地学-地球化学与地球物理
CiteScore
7.70
自引率
9.50%
发文量
151
审稿时长
3 months
期刊介绍: Tectonics (TECT) presents original scientific contributions that describe and explain the evolution, structure, and deformation of Earth¹s lithosphere. Contributions are welcome from any relevant area of research, including field, laboratory, petrological, geochemical, geochronological, geophysical, remote-sensing, and modeling studies. Multidisciplinary studies are particularly encouraged. Tectonics welcomes studies across the range of geologic time.
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