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首页> 外文期刊>Journal of Asian earth sciences >Strain modes within the forearc, arc and back-arc domains in the Izu (Japan) and Taiwan arc-continent collisional settings
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Strain modes within the forearc, arc and back-arc domains in the Izu (Japan) and Taiwan arc-continent collisional settings

机译：伊豆（日本）和台湾弧大陆碰撞设置中前，弧和后弧域内的应变模式

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In this study, I examine the strain modes of the forearc, arc and back-arc domains in arc-continent collisional settings leading to arc material subduction, delamination and/or accretion. The study focusses on two well-documented colliding island arcs: the Izu-Bonin-Mariana (IBM) arc in Japan and the Luzon arc in Taiwan, both carried by the Philippine Sea plate. Firstly, there is a body of evidence that both the IBM and the Luzon arcs were built on the same Late Jurassic to Early Cretaceous "proto-Philippine Sea Plate" crust. Their internal structure is thus more heterogeneous than expected from Paleogene or Neo-gene supposedly "intra-oceanic" island arcs. Secondly, those arc systems and proximal "back-arcs" have similar seismic characteristics attesting either for the presence of a middle crust with continental velocities and/or serpentinized uppermost mantle that facilitate crustal shortening/slivering and subsequent decoupling from the rest of the subducting plate. It is shown that the proximal back-arc domain (called "rear-arc" in case of paleoarc activity), overlying the mantle wedge and the subducting slab, may lose its strength if slab-derived hydration occur. Decoupling then occurs below the Moho. Arc delamination likely occurs in mid-crustal levels because middle-crust, heated by nearby magmatism, becomes weak. Accretion of arc material onto the upper plate depends on the characteristics of the arc itself and the geo-dynamic configuration. Most of the accreted material is probably underplated rather than frontally accreted.
机译：在这项研究中，我研究了在弧-大陆碰撞环境中前弧，弧和后弧区域的应变模式，这些应力模式导致弧物质俯冲，分层和/或积聚。这项研究集中在两个有据可查的碰撞岛弧上：日本的伊豆-波宁-马里亚纳（IBM）弧和台湾的吕宋弧，两者均由菲律宾海板带携带。首先，有大量证据表明IBM弧和吕宋弧都建立在同一侏罗纪晚期至早白垩世的“原始菲律宾海床”地壳上。因此，它们的内部结构比被认为是“古海洋”岛弧的古近纪或新近纪所预期的异质得多。其次，这些弧系和近端“后弧”具有类似的地震特征，证明存在具有大陆速度的中地壳和/或蛇形化的最上地幔，这有利于地壳的缩短/输送，并随后与俯冲板的其余部分解耦。 。结果表明，覆盖上地幔楔和俯冲板块的近端弧后区域（在古卵活动的情况下称为“后弧”）如果发生板块水化作用，可能会失去其强度。然后，去耦发生在莫霍面以下。电弧分层很可能发生在中地壳水平，这是由于附近岩浆作用加热的中地壳变弱了。电弧材料在顶板上的积聚取决于电弧本身的特性和地球动力学配置。大多数积聚的材料可能是底层镀层，而不是正面积聚。

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