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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Ar-40/Ar-39 geochronology and volume estimates of the Tasmantid Seamounts: Support for a change in the motion of the Australian plate
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Ar-40/Ar-39 geochronology and volume estimates of the Tasmantid Seamounts: Support for a change in the motion of the Australian plate

机译：塔斯曼蒂德海山的Ar-40 / Ar-39地质年代和体积估计：支持澳大利亚板块运动的变化

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New volume estimates and Ar-40/Ar-39 ages for the Tasmantid Seamounts are reported to investigate the origin of volcanism and potential links between volcanism and changes in the speed and direction of migration of the Australian plate during the Cenozoic. The results show that the average extrusive volume of individual volcanoes along the seamount chain is 2587 +/- 3078 km(3) (1 s), and that volumes generally increase towards the south. An exception, the Britannia Guyot, located in the middle of the seamount chain, is the most voluminous (11,374 km(3)). Nineteen new Ar-40/Ar-39 ages, from Wreck to Gascoyne, show that the emplacement of the Tasmantid Seamounts occurred between 33.2 +/- 1.5 and 6.5 +/- 0.6 Ma. A single linear regression applied to the age versus latitude data, assuming volcanism to be caused by plate migration over a stationary hotspot, reveals a plate migration rate of 62 +/- 2 kmMa(-1) (R-2 = 0.97; n = 27) between similar to 33 and 6 Ma. However, the bend in the seamount track, corresponding with the period of largest eruptive volumes, suggests three distinct segments in the Tasmantid age versus latitude data. The northern segment is consistent with a plate migration rate of 75 +/- 10 kmMa(-1) (R-2 = 0.88; n = 10) and the southern segment reveals a plate migration rate of 64 +/- 4 kmMa(-1) (R-2 = 0.94; n = 17). The period between these two segments, from similar to 25 to 19 Ma, overlaps with the period of slow migration and change in the direction of the Australian plate derived from the age versus latitude distribution of continental central volcanoes. The new Tasmantid Seamount results support the interpretation that there were changes in the velocity and direction to Australia's northward trajectory, possibly resulting from a series of collisional events. (C) 2017 Elsevier B.V. All rights reserved.
机译：据报道，塔斯曼蒂德海山有新的体积估计值和Ar-40 / Ar-39年龄，以调查火山的起源以及火山作用与新生代期间澳大利亚板块迁移速度和方向变化之间的潜在联系。结果表明，沿海山链的单个火山的平均挤出量为2587 +/- 3078 km（3）（1 s），并且该量通常向南增加。最大的例外是位于海山链中间的不列颠尼亚·古约（Britannia Guyot）（11,374 km（3））。从残骸到加斯科因的19个新的Ar-40 / Ar-39年龄表明，塔斯曼蒂德海山的进驻发生在33.2 +/- 1.5到6.5 +/- 0.6 Ma之间。假设火山作用是由固定热点上的板块迁移引起的，对年龄和纬度数据进行了一次线性回归分析，结果表明板块迁移率为62 +/- 2 kmMa（-1）（R-2 = 0.97; n = 27）介于33和6 Ma之间。但是，海山径的弯曲对应于最大喷发量的时期，表明了塔斯曼蒂德年龄与纬度数据的三个截然不同的部分。北部段的板块迁移速率为75 +/- 10 kmMa（-1）（R-2 = 0.88; n = 10），南部段板块的迁移速率为64 +/- 4 kmMa（- 1）（R-2 = 0.94; n = 17）。这两个部分之间的时间段，从大约25 Ma到19 Ma，与缓慢迁移的时间段重叠，并且是根据大陆中部火山的年龄与纬度分布得出的澳大利亚板块方向的变化。 Tasmantid Seamount的新结果支持这样的解释，即澳大利亚向北的速度和方向发生了变化，这可能是由一系列碰撞事件引起的。 （C）2017 Elsevier B.V.保留所有权利。

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