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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Mesozoic paleomagnetism of the Taigonos Peninsula, the Sea of Okhotsk implications to kinematics of continental and oceanic plates
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Mesozoic paleomagnetism of the Taigonos Peninsula, the Sea of Okhotsk implications to kinematics of continental and oceanic plates

机译：塔霍戈斯半岛的中生代古磁性，鄂霍次克海对大陆和大洋板块运动学的影响

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摘要

Mesozoic island-arc and oceanic volcanic-sedimentary complexes were sampled at eight localities at the Taigonos Peninsula on the northern coast of the Sea of Okhotsk. Our of more than 250 samples, most proved to be completely remagnetized at the final stage of deformation by the end of Early Cretaceous; this pervasive remagnetization is probably related to onset of volcanic activity in the Okhotsk-Chukotka belt. Geological data and overall agreement of these remagnetization directions with the Eurasian and North American reference values imply that the Taigonos Peninsula did not move with respect to the continental margin since the Early Cretaceous. A pre-remagnetization remanence was isolated only from Middle-Upper Jurassic cherts, where mean direction of a prefolding component (D = 296 deg, I = 54 deg, a_(95) = 4.5 deg; after tilt correction) was determined by combining four component directions and 20 remagnetization circles. These results imply the original position of the cherts at about 35 deg N and their later northward transport over more than 3000 km. Geological data indicate docking of the studied chert units during the second half of the Early Cretaceous. Kinematic analysis show that the only permissible scenario includes chert accumulation and subsequent motion on the Izanagi Plate and docking to the continental margin at about 115 Ma. It means that this plate was being subducted under the active margin of Siberia during the Early Cretaceous, and thus the convergent boundary of the Izanagi and Farallon Plates in the central North Pacific was located much to the east from its earlier proposed position.
机译：在鄂霍次克海北部海岸的塔戈诺斯半岛的八个地方采样了中生代岛弧和大洋火山沉积沉积物。我们的250多个样品中，大多数被证明在白垩纪早期已经在变形的最后阶段被完全磁化。这种普遍的磁化作用可能与鄂霍次克-楚科奇火山带的火山活动开始有关。地质数据以及这些磁化方向与欧亚和北美参考值的总体吻合表明，自白垩纪以来，塔戈诺斯半岛相对于大陆边缘没有发生移动。仅从中上侏罗统石中分离出磁化前的剩磁，其中通过组合四个来确定预折叠分量的平均方向（D = 296度，I = 54度，a_（95）= 4.5度;倾斜校正后）组件方向和20个磁化圈。这些结果表明，ts石的原始位置大约在北纬35度，随后向北迁移超过3000公里。地质数据表明，在早白垩世下半期研究的石单元对接。运动学分析表明，唯一可允许的场景包括t石积聚和在Izanagi板块上的后续运动，并在约115 Ma处与大陆边缘对接。这意味着该板块在白垩纪早期就被西伯利亚的活动边缘俯冲了，因此在北太平洋中部的Izanagi和Farallon板块的会聚边界位于其较早提出的位置以东。

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