Backarc tectonism, volcanism, and mass wasting shape seafloor morphology in the Santorini-Christiana-Amorgos region of the Hellenic Volcanic Arc

Backarc tectonism, volcanism, and mass wasting shape seafloor morphology in the Santorini-Christiana-Amorgos region of the Hellenic Volcanic Arc
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弧后构造作用、火山作用和质量消耗塑造了希腊火山弧圣托里尼-克里斯蒂安娜-阿莫尔戈斯地区的海底形态

DOI:
10.1016/j.tecto.2017.06.005
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发表时间:
2017
期刊:
影响因子:
2.9
通讯作者:
Gray, Melissa
Gray, Melissa
中科院分区:
地球科学2区
文献类型:
--
作者:
Hooft, Emilie E.E.;Nomikou, Paraskevi;Toomey, Douglas R.;Lampridou, Danai;Getz, Claire;Christopoulou, Maria-Eleni;O'Hara, Daniel;Arnoux, Gillean M.;Bodmer, Miles;Gray, Melissa

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在俯冲带弧后,伸展变形和弧火山作用相互作用,这些过程,加上质量浪费,塑造海底形态。我们提出了一个新的测深图的希腊俯冲带的Santorini-Christiana-Amorgos弧后区域合并高分辨率多波束条带数据从R/VLangsethPROTEUS地震实验与现有的地图。该地图连同克努森海底回声测深剖面显示,最近的构造作用,火山活动和质量浪费是更普遍的圣托里尼-阿莫尔戈斯地区的圣托里尼岛东侧比在克里斯蒂娜盆地西侧。在Santorini-Amorgos地区,大的正断层形成Anydros和Anados盆地。在正常断层段重叠的地方,附近的两个调节带产生了一个中继斜坡和相邻的Anydros向斜地垒,并伴随着复杂的断层和地震活动。圣托里尼-阿摩尔戈斯地区正在进行的正断层活动伴随着潜在的海啸海底滑坡;我们确定了一个沿着圣托里尼-阿摩尔戈斯断层的大型海底滑坡,以及一个沿着沿着阿摩尔戈斯断层的小型滑坡,其上覆有一个碎屑斜槽。火山活动也集中在这一东部地区沿着Kolumbo线性内的Anydros盆地。在克里斯蒂娜盆地内,我们发现了Proteus Knoll和邻近的埋藏建筑物。我们认为,这是一个古老的火山建筑物形成沿着希腊火山弧之间的圣托里尼和米洛斯。在圣托里尼岛周围,青铜时代晚期火山爆发期间和之后形成的特征主导了海底形态,如北方海峡和褶皱海底火山碎屑流沉积物。这种地形在不断的质量浪费下不断地在较小的尺度上重塑。我们推断,地震,火山和海啸活动的圣托里尼-阿莫尔戈斯地区是一个结果,集中西北-东南延伸的爱琴海东南部远离阿提科-基克拉迪复杂的板块破裂和回滚。
In subduction zone backarcs, extensional deformation and arc volcanism interact and these processes, together with mass wasting, shape the seafloor morphology. We present a new bathymetric map of the Santorini-Christiana-Amorgos backarc region of the Hellenic subduction zone by merging high-resolution multibeam swath data from the R/VLangsethPROTEUS seismic experiment with existing maps. The map together with Knudsen subbottom echosounding profiles reveal that recent tectonism, volcanism, and mass wasting are more prevalent in the Santorini-Amorgos region on the east side of Santorini than in the Christiana Basin on the west side. In the Santorini-Amorgos region, large normal faults form the Anydros and Anafi Basins. Where normal fault segments overlap, two nearby accommodation zones generate a relay ramp and the adjoining Anydros synclinal horst with associated complex faulting and elevated seismicity. The ongoing normal faulting in the Santorini-Amorgos region is accompanied by potentially tsunamigenic submarine landsliding; we identified a large submarine landslide along the Santorini-Amorgos Fault and a smaller landslide with an overlying debris chute along the Amorgos Fault. Volcanic activity is also focused in this eastern region along the Kolumbo lineament within the Anydros Basin. Within the Christiana Basin we discovered the Proteus Knoll and adjacent buried edifice. We suggest that this is an older volcanic edifice formed along the Hellenic Volcanic Arc between Santorini and Milos. Around Santorini itself, features formed during, and immediately after, the Late Bronze Age eruption dominate the seafloor morphology such as the northern strait and wrinkled seafloor pyroclastic flow deposits. This topography is continually reshaped at a smaller scale by ongoing mass wasting. We infer that the earthquake, volcanic, and tsunami activity of the Santorini-Amorgos region is a consequence of focused northwest-southeast extension as the southeastern Aegean moves away from the Attico-Cycladic complex in response to slab breakup and rollback.
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