Tectonic reconstructions of New Zealand: 40 Ma to the Present
Tectonic reconstructions of New Zealand: 40 Ma to the Present
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新西兰的构造重建：40 Ma 至今
DOI：
10.1080/00288306.2000.9514913
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发表时间：
2000
影响因子：
2.2
通讯作者：
P. King
中科院分区：
文献类型：
--
作者：
P. King
摘要 介绍了新西兰次大陆从 40 Ma 至今的重建情况。限制模型的假设包括： 基底地层和标记的半直线初始对齐；澳板固定；翡翠盆地在 c 开始扩张。 45马；和太平洋板块在新西兰北部的俯冲。 30马。采用五个独立的刚性地壳块，包括：北国-塔拉纳基-南岛西部（合并）、东海岸（北岛）、东尼尔森（马尔堡峡湾）、南岛东部和峡湾。 40 Ma 时，太平洋/澳大利亚自转极位于旺加努伊地区附近或之内。原板块边界带正在新西兰西部扩展，作为南部扩张的翡翠盆地与西北俯冲之间的早期联系。阿尔卑斯断层的横向偏移是由c开始的。 23-22 Ma，主要是新西兰中部地区俯冲运动学变化和澳大利亚板块和太平洋板块相对运动增加的影响。南部的延伸变得越来越倾斜，而阿尔卑斯断层以北的地区则受到近正交压缩的影响。来自c。 23Ma至今，新西兰中西部的收缩、伸展和弧火山活动的焦点已向南迁移，以应对俯冲太平洋板块的位置、方向、倾斜度和运动学的逐渐变化。
Abstract Reconstructions of the New Zealand subcontinent from 40 Ma to the Present are presented. Assumptions that have constrained the model include: semi‐straight initial alignment of basement terranes and markers; Australian plate fixed; onset of Emerald Basin spreading at c. 45 Ma; and Pacific plate subduction north of New Zealand from c. 30 Ma. Five independent, rigid, crustal blocks are employed, including: Northland‐Taranaki‐western South Island (combined), East Coast (North Island), east Nelson (Marlborough Sounds), eastern South Island, and Fiordland. At 40 Ma the Pacific/Australian rotation pole was located close to or within the Wanganui region. A proto‐plate boundary zone was propagating through western New Zealand, as an incipient link between Emerald Basin spreading in the south and subduction in the northwest. Lateral offset on the Alpine Fault was initiated by c. 23–22 Ma, mainly as an effect of changing subduction kinematics and increasing relative motion of the Australian and Pacific plates in the central New Zealand region. Extension in the south became increasingly oblique, whereas areas north of the Alpine Fault were affected by near‐orthogonal compression. From c. 23 Ma to the Present, the foci of contraction, extension, and arc volcanism in central‐western New Zealand have migrated southwards, in response to progressive changes in the location, orientation, inclination, and kinematics of the subducted Pacific plate.