Ocean bottom geophysical array studies may reveal the cause of seafloor flattening
Ocean bottom geophysical array studies may reveal the cause of seafloor flattening
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海底地球物理阵列研究可能揭示海底扁平化的原因
DOI：
10.1016/j.epsl.2019.04.040
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发表时间：
2019
影响因子：
5.3
通讯作者：
Utada Hisashi
中科院分区：
文献类型：
--
作者：
赤松祐哉;長瀨薫平;阿部なつ江;岡﨑啓史;畠山航平;片山郁夫;Utada Hisashi
由于海洋岩石圈和软流圈的时间演化而导致的古老海底的压扁作用，是地球动力学尚未解决的基本问题之一。年龄大于70-80 Ma的海底变平现象可以用一个简单的固定厚度的冷却板模型来解释，但变平的物理原因还没有完全弄清楚。在这里，一个简单的模型的岩石圈再生被认为是一种替代机制，也被证明是代表类似的功能海底变平。我们认为，从使用的数据，如海底深度和热流的变化对地幔结构的约束是弱的，但地幔热结构的一阶差异，这两个模型介绍。这表明，通过海底地球物理阵列探测地幔，特别是那些对地幔温度敏感的阵列，如大地电磁成像，应该能够限制海底变平的原因。在本研究中，汇编了海底电磁勘探的最新结果，并将高导电层的估计深度用作1 300 °C等温线深度的替代。对于在远离太平洋板块边界的地点获得的数据，发现岩石圈复兴模型比标准的板块冷却模型更好地解释了HCL深度和海底深度之间的相关性。
Flattening of old seafloor as a result of the time evolution of oceanic lithosphere and asthenosphere has been studied for several decades and remains one of the unresolved fundamental problems of geodynamics. The phenomenon of seafloor flattening at ages greater than 70-80 Ma can be explained by a simple model of a cooling plate with a fixed thickness, but the physical cause of flattening is not fully understood. Here, a simple model of lithosphere rejuvenation is considered as an alternative mechanism and is also shown to represent similar features of seafloor flattening. We suggest that constraints on mantle structure from use of data such as variations of seafloor depth and heat flow are weak, but that first order differences in mantle thermal structure are introduced by these two models. This suggests that probing of the mantle by geophysical arrays on the seafloor, particularly those sensitive to mantle temperature such as magnetotelluric imaging, should be able to constrain the cause of seafloor flattening. In the present study, recent results of seafloor electromagnetic explorations are compiled and estimated depths to the high conductivity layer (HCL) are used as a proxy for 1,300 °C isotherm depths. For the data obtained at sites well away from plate boundaries in the Pacific Ocean, a model of lithosphere rejuvenation was found to better explain the correlation between HCL depths and seafloor depths than a standard plate cooling model.
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影响因子：
--
作者：
G. Davies
通讯作者：
G. Davies
影响因子：
1.6
作者：
S. Zlotnik;J. Afonso;P. Díez;Manel Fernàndez
通讯作者：
S. Zlotnik;J. Afonso;P. Díez;Manel Fernàndez
影响因子：
5.2
作者：
M. Ballmer;J. Hunen;Garrett Ito;P. Tackley;T. Bianco
通讯作者：
M. Ballmer;J. Hunen;Garrett Ito;P. Tackley;T. Bianco
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
B. Goutorbe;J. Hillier
通讯作者：
J. Hillier
可变热导率和膨胀率对海洋岩石圈热结构的相互作用
DOI：
--
发表时间：
2004
期刊：
Earth Planets Space 56
影响因子：
--
作者：
Honda;S.;D.A.Yuen
通讯作者：
D.A.Yuen