Physics of the Earth and Planetary Interiors最新文献_第2页

Boundary layer interactions in mantle convection: Peaks, limits and effects on convective scaling relations 地幔对流中的边界层相互作用：对对流标度关系的峰值、极限和影响

IF 1.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Physics of the Earth and Planetary Interiors

Pub Date : 2025-12-12 DOI: 10.1016/j.pepi.2025.107485

Julian Garrido-Tomasini , Adrian Lenardic , William Moore

Convection in the Earth’s mantle is associated with two thermal boundary layers: the Earth’s thermal lithosphere and a layer above the core-mantle boundary, generally considered the source of plumes. Classical convection theory, often applied to thermal-tectonic history modeling, assumes that convective boundary layers do not interact and their dynamics are self-determined. However, present-day observations of plumes reaching the lithosphere and slabs sinking to the core–mantle boundary indicate that boundary layer interactions are a component of mantle dynamics. Whether this was the case over Earth’s history motivates the 3D thermal convection simulations herein. We investigate boundary layer interactions to determine: (1) The level of convective vigor, measured by the Rayleigh number, at which interactions peak; (2) The level at which interactions cease; (3) Whether interactions are responsible for deviations in convective scalings from classical theory predictions. We found that interactions peak near a Rayleigh number of

1 0^{7}

. Beyond that, they decrease, but changes in convective planform led to local peaks. Classical scaling theory for heat flux and velocity is not recovered until Rayleigh numbers exceed

3 \times 1 0^{9}

, after which the convective planform remains in a chaotic plume regime and interactions continually decrease. We attribute deviations from classic theory to these interactions altering boundary layer structure from what would be observed if their dynamics were self-determined. We demonstrate that the deviations are not solely due to thermal effects, but also mechanical effects. We found that interactions are at a peak near present-day mantle conditions. We discuss implications for geodynamics and mantle evolution.

地幔中的对流与两个热边界层有关：地球的热岩石圈和核心-地幔边界之上的一层，通常被认为是羽流的来源。经典对流理论通常应用于热构造史建模，它假设对流边界层不相互作用，其动力学是自定的。然而，目前对到达岩石圈的地幔柱和下沉到岩心-地幔边界的板块的观测表明，边界层相互作用是地幔动力学的一个组成部分。地球历史上是否存在这种情况激发了本文的三维热对流模拟。我们通过研究边界层相互作用来确定：(1)通过瑞利数测量的对流活力水平，在相互作用达到峰值时；(2)相互作用停止的水平；(3)相互作用是否导致对流标度偏离经典理论预测。我们发现相互作用在瑞利数107附近达到峰值。除此之外，它们会减少，但对流平台的变化导致局部峰值。经典的热通量和速度标度理论直到瑞利数超过3×109才恢复，此后对流平台仍处于混沌羽流状态，相互作用不断减弱。我们将经典理论的偏差归因于这些相互作用改变了边界层结构，如果它们的动力学是自定的，将会观察到什么。我们证明了这些偏差不仅是由于热效应，而且是由于机械效应。我们发现，在现今的地幔条件下，相互作用达到了顶峰。我们讨论了地球动力学和地幔演化的意义。

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引用次数: 0

Improving the reconstruction of Holocene geomagnetic paleosecular variation in the Antarctic region 改进南极地区全新世地磁古长期变化的重建

IF 1.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Physics of the Earth and Planetary Interiors

Pub Date : 2025-12-11 DOI: 10.1016/j.pepi.2025.107487

Leonardo Sagnotti , Chiara Caricchi , Patrizia Macrì , Ester Colizza , Paola Del Carlo , Alessio Di Roberto , Aldo Winkler

We present new paleomagnetic data from the ANTA02-AV43 core collected in the Ross Sea (Antarctica), spanning the last 10 ka. Results document a relative paleointensity (RPI) record that closely matches predictions from global geomagnetic models and from previously published records from nearby peri-Antarctic margins, including the Ross Sea and Wilkes Land Basin, covering the same time interval. The stratigraphic trends of directional paleomagnetic data from this study show features that are also consistent with global model predictions and earlier published data, supporting regional reconstructions of geomagnetic paleosecular variation (PSV). Notable differences reflect effects such as sedimentary inclination shallowing and the arbitrary restoration of magnetic declination in marine cores lacking azimuthal orientation.

We combined the new ANTA02-AV43 dataset with existing Holocene records from two additional sediment cores of comparable resolution to develop the paleomagnetic “HOLOANTA” stack. This composite record averages paleomagnetic data over the last 10,000 years in 200-year intervals. It includes RPI as well as paleomagnetic inclination and declination data, providing a robust regional Holocene RPI curve alongside directional secular variation (PSV) trends. The HOLOANTA stack serves as a novel tool to support high-resolution correlation between sedimentary cores and the development of detailed age models in marine sequences from the peri-Antarctic margins.

本文介绍了南极罗斯海ANTA02-AV43岩心近10 ka的新古地磁资料。研究结果表明，相对古强度（RPI）记录与全球地磁模型的预测和之前发表的南极周边边缘（包括罗斯海和威尔克斯陆盆）的记录非常吻合，这些记录覆盖了相同的时间间隔。本研究的定向古地磁资料的地层趋势也显示出与全球模式预测和早期发表的资料一致的特征，支持了地磁古长期变化（PSV）的区域重建。这些显著差异反映了沉积倾角变浅和缺乏方位定位的海相岩心磁偏角的任意恢复等影响。我们将新的ANTA02-AV43数据集与另外两个具有相当分辨率的沉积物岩心的全新世记录相结合，建立了古地磁“HOLOANTA”叠。这一合成记录以200年的间隔平均了过去1万年的古地磁数据。它包括RPI以及古地磁倾角和赤纬数据，提供了一个强大的区域全新世RPI曲线以及定向长期变化（PSV）趋势。HOLOANTA叠层作为一种新的工具，可以支持沉积岩心之间的高分辨率相关性，并开发出南极边缘海相序列的详细年龄模型。

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引用次数: 0

Lithospheric deformation across Dhubri-Chungthang Fault Zone: New insights into Himalayan segmentation 杜布里-忠塘断裂带岩石圈变形：喜马拉雅分割的新认识

IF 1.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Physics of the Earth and Planetary Interiors

Pub Date : 2025-12-06 DOI: 10.1016/j.pepi.2025.107486

Aamir Salam Siddiqui , Arun Singh , Chandrani Singh , Debasis D. Mohanty , Gaurav Kumar , Niptika Jana

We trace signatures of lithospheric deformation beneath Sikkim Himalaya using newly acquired data of core-mantle refracted shear wave phases (SKS/SKKS) from 27 broadband seismic stations covering the region. Here, the underthrusting India plate is possibly segmented by the Dhubri-Chungthang Fault Zone (DCFZ), a major fault zone passing through Sikkim. While the presence of the DCFZ is more or less substantiated by seismicity, its structural imprints in the deep lithosphere remain elusive. Shear wave splitting (SWS) parameters (fast polarization direction

ϕ

and delay time

δ t

) from SKS/SKKS phases analyse the extent and pattern of deformation beneath Sikkim Himalaya. Robust individual and mean SWS measurements show a particular trend of variational deformation patterns throughout Sikkim, with a significant transition in

δ

t (0.3–2.5 s) and

ϕ

across the DCFZ. The variation in deformation pattern across the DCFZ, represent the influence of the DCFZ on the deep lithospheric scale segmentation of the Indian plate. The dominant E-W (

\sim

100°) pattern in

ϕ

with smaller

δ

t values (

\sim

0.3 s) in southern Sikkim within the Main Central Thrust region represents the dominance of compressional tectonics with a possible multi-layer anisotropy scenario. While the spatially dispersed seismic stations in the Himalayan foreland are dominated by deformation pattern parallel to the Absolute Plate Motion of the Indian plate,

ϕ

patterns are governed by the shear caused by the basal drag at the base of the Indian lithosphere. While a NE pattern of

ϕ

is dominant here, some deviations may be due to different driving forces related to the Indian plate position.

利用覆盖该地区27个宽带地震台站新获得的核幔折射横波相位（SKS/SKKS）数据，对锡金喜马拉雅地区岩石圈变形特征进行了追踪。在这里，逆冲下的印度板块可能被穿过锡金的主要断裂带杜布里-忠塘断裂带（DCFZ）分割。虽然地震活动或多或少地证实了DCFZ的存在，但它在岩石圈深处的结构印记仍然难以捉摸。来自SKS/SKKS相位的剪切波分裂（SWS）参数（快速极化方向φ和延迟时间δt）分析了锡金喜马拉雅地区的变形范围和模式。稳健的个体和平均SWS测量结果显示，整个锡金地区的形变模式有特殊的变化趋势，δt （0.3-2.5 s）和φ在DCFZ上有显著的转变。整个DCFZ的形变模式变化，反映了DCFZ对印度板块深部岩石圈尺度分割的影响。在锡金南部，在主中央逆冲区内，主导的ϕ与较小的δt值（~ 0.3 s）较小的E-W（~ 100°）模式代表了挤压构造的主导地位，可能是多层各向异性的情景。喜马拉雅前陆的空间分散地震台站主要受平行于印度板块绝对板块运动的形变模式支配，而其中的φ模式主要受印度岩石圈底部基底阻力引起的剪切模式支配。虽然这里的NE型ϕ占主导地位，但一些偏差可能是由于与印度板块位置相关的不同驱动力。

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引用次数: 0

Effects of rheological parameters on the stability of thermochemical piles: A comparison of different origins 流变参数对热化学桩稳定性的影响：不同来源的比较

IF 1.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Physics of the Earth and Planetary Interiors

Pub Date : 2025-12-03 DOI: 10.1016/j.pepi.2025.107476

Henry W. Sitte, Claudia Stein, Carolin Weber, Ulrich Hansen

Large low shear velocity provinces have been observed beneath Africa and the Pacific. These large-scale structures are considered to have been stable the last hundred million years with their origin and nature still being an open question.

In our 2D Cartesian study, we numerically investigate the temporal and spatial stability of thermochemical piles. We consider two different scenarios, in which the piles either arise from a primordial layer above the core-mantle boundary (CMB) or from an influx of iron-rich material through the CMB. The investigated mantle flow depends on viscosity varying with composition, depth, and stress. The rheological parameters affect the strength of convection and consequently the stability of piles. An increased top or bottom viscosity reduces the convective vigor yielding longer-lived and more stable piles. Likewise, a thermal expansivity decreasing with depth exhibits longer pile lifetimes and less pile movement. Furthermore, piles and plumes are two closely linked structures. While thermochemical plumes are anchored by piles, thermal plumes attract piles and deform them. Long-lived plumes tend to be located in the center of piles, but during dynamical processes, such as merging of piles, plumes also occur at the edges remaining there for several million years.

In summary, we suggest that the LLSVPs might have formed early after the magma ocean, probably as several initially thin structures due to strong convection in the hot Archean mantle. With the cooling of the mantle, the structures would have broadened and stabilized in space and time, yielding the present-day state.

在非洲和太平洋下面观测到大的低切变速度省。这些大型结构被认为在过去的一亿年里是稳定的，它们的起源和性质仍然是一个悬而未决的问题。在我们的二维笛卡尔研究中，我们数值研究了热化学桩的时空稳定性。我们考虑了两种不同的情况，在这种情况下，堆要么来自核幔边界（CMB）上方的原始层，要么来自通过CMB涌入的富铁物质。所研究的地幔流动取决于粘度随成分、深度和应力的变化。流变参数影响桩的对流强度，从而影响桩的稳定性。增加的顶部或底部粘度降低了对流活力，使桩的寿命更长，更稳定。同样，热膨胀系数随深度减小，桩的寿命更长，桩的运动更少。此外，桩和柱是两个紧密相连的结构。当热化学羽流被桩锚定时，热羽流吸引桩并使其变形。长寿命的羽流往往位于桩的中心，但在动力过程中，如桩的合并，羽流也会出现在边缘，并在那里停留数百万年。综上所述，我们认为llsvp的形成可能早于岩浆海，可能是由于太古宙热地幔的强对流而形成的几个最初的薄结构。随着地幔的冷却，这些结构会在空间和时间上变宽并稳定下来，从而形成今天的状态。

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引用次数: 0

Non-negligible oxygen in the inner core: Investigating the partitioning between liquid and HCP iron 内核中不可忽略的氧：研究液体和HCP铁之间的分配

IF 1.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Physics of the Earth and Planetary Interiors

Pub Date : 2025-11-28 DOI: 10.1016/j.pepi.2025.107477

Qianxi Chen , Hua Yang , Feiwu Zhang , Joshua M.R. Muir

Oxygen is a light element that is likely present in the Earth's outer core, yet its solubility in the inner core has conventionally been regarded as negligible, based on previously measured or calculated low partition coefficients from liquid to solid iron. By employing ab initio molecular dynamics simulations under core conditions, we show that a superionic transition allows oxygen to incorporate into solid HCP‑iron at concentrations of 0.3–0.37 wt%, exceeding the < 0.1 wt% limit of substitutional models. Moreover, the softening effect of superionic oxygen on HCP-iron is more pronounced than that induced by substitutional oxygen. These results challenge the traditional paradigm of oxygen exclusion in the inner core and emphasize the importance of incorporating superionic transport into future models of core composition.

氧是一种很可能存在于地球外核的轻元素，但它在地心的溶解度通常被认为是可以忽略不计的，这是基于以前测量或计算的从液态到固态铁的低分配系数。通过在核心条件下进行从头算分子动力学模拟，我们发现超离子跃迁允许氧以0.3-0.37 wt%的浓度并入固体HCP -铁中，超过了替代模型的0.1 wt%的限制。此外，超离子氧对hcp -铁的软化作用比取代氧更明显。这些结果挑战了传统的内核氧排斥范式，并强调了将超电子输运纳入未来核心组成模型的重要性。

引用次数: 0

Water in the lower mantle: constraints from mineral physics and phase equilibrium data 下地幔中的水：来自矿物物理和相平衡数据的约束

IF 1.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Physics of the Earth and Planetary Interiors

Pub Date : 2025-11-12 DOI: 10.1016/j.pepi.2025.107475

Li Zhang , Qun-ke Xia

Water cycle in the Earth’s deep interior plays a critical role in mantle dynamics. Some subducting materials can reach the core-mantle boundary delivering water along the subduction path. High water content in basalts of ocean islands and large igneous provinces, which were formed by mantle plumes, suggests the presence of water-rich sources in the lower mantle. The seismic observation of low-velocity anomalies in the uppermost lower mantle may imply partial melting associated with water transport out of the transition zone and the released hydrous melts can migrate into the overlying crust layer. Recent experiments indicate that hydrated aluminous silica phases are the best candidate hosts for water transport in slab crust in the lower mantle down to the core mantle boundary owing to their high water storage capacity and exceptional thermal stability. The presence of H₂O significantly lowers the stishovite-to-poststishovite transition pressure to a much shallower depth <1000 km and further stabilizes alumina-rich NiAs-type silica phase (Nt) at the depth >1800 km. In peridotitic compositions, the δ-H solid solution AlOOH–MgSiO₄H₂ is a potential water carrier. The alumina and water partitioning under the lower mantle conditions significantly changes the transition thickness of bridgmanite-to-postperovskite, which allows reasonable interpretation of the seismic scatters and discontinuity in the lower mantle. At the core-mantle boundary, water released upon heating may induce partial melting in subducted oceanic crust, possibly accounting for the ultra-low-velocity zones (ULVZs) detected in high-velocity region. Future studies on multicomponent systems under high pressure and high temperature conditions will be needed to understand how water is exchanged between various mantle reservoirs and how the subducted water and dehydration melting affects the dynamics at the core-mantle boundary.

地球深处的水循环在地幔动力学中起着至关重要的作用。一些俯冲物质可以到达核幔边界，沿着俯冲路径输送水。地幔柱形成的洋岛玄武岩和大火成岩省玄武岩含水量高，表明下地幔存在富水源。下上地幔低速异常的地震观测可能暗示了部分熔融与水从过渡带运出有关，释放的含水熔体可能迁移到上覆地壳层。最近的实验表明，水合硅铝相具有较高的储水能力和优异的热稳定性，是下地幔板块地壳向地核地幔边界输水的最佳候选寄主。H2O的存在显著降低了较浅深度（1000 km）的石橄榄岩-后石橄榄岩转变压力，并进一步稳定了深度（1800 km）的富铝nias型二氧化硅相（Nt）。在橄榄岩组分中，δ-H固溶体aloh - mgsio4h2是潜在的水载体。下地幔条件下氧化铝和水的配分显著改变了桥锰矿-后钙钛矿的过渡厚度，合理解释了下地幔的地震散射和不连续。在核幔边界，加热释放的水可能引起俯冲洋壳的部分熔融，这可能是在高速区探测到超低速带的原因。未来需要对高压高温条件下的多组分系统进行研究，以了解不同地幔储层之间的水交换以及俯冲水和脱水熔融如何影响核幔边界的动力学。

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引用次数: 0

Source characteristics of the June 21, 2022 (Mw 6.1) Khost earthquake, Afghanistan 2022年6月21日阿富汗霍斯特地震震源特征

IF 1.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Physics of the Earth and Planetary Interiors

Pub Date : 2025-11-07 DOI: 10.1016/j.pepi.2025.107467

Mohammad Raeesi , Aram Fathian , Ali Misaghi , Cristiano Tolomei

The June 21, 2022, Khost earthquake in southeastern Afghanistan impacted a rural area housing multiple inadequately constructed towns and villages. Reports indicated over 3600 injuries and a minimum of 1163 fatalities. Historical records did not document any significant seismic events in the area prior to this incident. To examine the rupture process of the earthquake, we conducted multiple analyses using teleseismic and InSAR data, employing separate and joint slip inversion. Given that the 2022 earthquake only slightly ruptured the near-surface crust, the results imply that significantly larger earthquakes might occur again in the same location. The main stress was released as an impulsive rupture that lasted only two to three seconds.

2022年6月21日，阿富汗东南部的霍斯特地震影响了一个农村地区，那里有许多建筑不完善的城镇和村庄。报告显示，超过3600人受伤，至少1163人死亡。在此之前，历史记录并未记载该地区发生过重大地震事件。为了研究地震的破裂过程，我们利用远震和InSAR数据进行了多重分析，采用分离和联合滑动反演。考虑到2022年的地震只轻微破坏了近地表地壳，结果意味着在同一地点可能会再次发生明显更大的地震。主应力以脉冲破裂的形式释放，只持续了两到三秒。

引用次数: 0

Effective gauss-newton inversion for 3D magnetotelluric data with arbitrarily anisotropic conductivities 具有任意各向异性电导率的三维大地电磁资料的有效高斯牛顿反演

IF 1.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Physics of the Earth and Planetary Interiors

Pub Date : 2025-11-06 DOI: 10.1016/j.pepi.2025.107465

Junjun Zhou , Bo Han , Andreas Junge , Xiangyun Hu , Tiaojie Xiao , Zhidan Long , Ningbo Bai

A three-dimensional (3D) magnetotelluric (MT) inversion framework for arbitrarily anisotropic media has been developed. This method integrates efficient forward modeling with Gauss-Newton (GN) minimization, utilizing an implicit formulation for sensitivity calculations. The forward problem is discretized using the edge-based finite element (FE) method, where a real-valued linear system, derived from the original complex-valued system, is solved with a direct-iterative hybrid solver to enhance computational efficiency. To address the storage and computational challenges posed by large, dense matrices during inversion, the preconditioned conjugate gradient (PCG) algorithm is employed for model updates. A horizontal anisotropic model is used to evaluate various inversion scenarios, including isotropic, principal axial anisotropic, and more complex anisotropic cases. The influence of inversion parameters on the data is analyzed, and the recoverability of these parameters is thoroughly investigated. Furthermore, the anisotropic inversion algorithm is applied to a complex model that includes both anisotropic and isotropic blocks to evaluate the algorithm's reliability. Finally, the inversion method is tested on the USArray MT dataset, demonstrating its robustness and effectiveness.

建立了一种适用于任意各向异性介质的三维大地电磁反演框架。该方法将有效的正演建模与高斯-牛顿（GN）最小化相结合，利用隐式公式进行灵敏度计算。采用基于边缘的有限元方法将正演问题离散化，利用直接迭代混合求解器求解由原复值系统导出的实值线性系统，以提高计算效率。为了解决大型密集矩阵在反演过程中带来的存储和计算挑战，采用预置共轭梯度（PCG）算法进行模型更新。水平各向异性模型用于评估各种反演情景，包括各向同性、主向各向异性和更复杂的各向异性情况。分析了反演参数对数据的影响，并对反演参数的可恢复性进行了深入研究。此外，将各向异性反演算法应用于包含各向异性和各向同性块的复杂模型，以评估算法的可靠性。最后，在USArray MT数据集上对该反演方法进行了测试，验证了该方法的鲁棒性和有效性。

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引用次数: 0

Detecting rapid lateral changes of upper mantle discontinuities using azimuth-dependent P-wave receiver functions and multimode surface waves 利用方位相关p波接收函数和多模面波探测上地幔不连续面快速横向变化

IF 1.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Physics of the Earth and Planetary Interiors

Pub Date : 2025-11-04 DOI: 10.1016/j.pepi.2025.107468

Kotaro Tarumi, Kazunori Yoshizawa

Lateral structural variations in the upper mantle generate azimuthal dependence in receiver functions (RFs) based on incoming directions of body waves. Although these azimuthal variations in RFs have not been considered in earlier studies of RF inversions, they provide a means to image localized changes in upper mantle interfaces. In this study, we incorporate azimuth-dependent RFs into a joint Bayesian inversion with multimode surface waves, applying this approach to major permanent broadband stations in Australia. The resulting models reveal dependence on event directions, and by identifying P-to-S conversion depths, we constructed a localized map of conversion points, reflecting local lateral variations of upper mantle discontinuities beneath each station. At the CTAO station in northeastern Australia, the lithosphere thickens rapidly northwestward, from 70 km to 120-130 km depth, corresponding to the tectonic boundary with the western cratonic region. At stations in western and central Australia, lithospheric thickness also varies laterally within the stable cratons, though these changes are more gradual than those in northeastern Australia. In addition to the lithosphere–asthenosphere boundary (LAB), both mid-lithospheric discontinuities (MLDs) and X-discontinuities (X-Ds) are observed in the local 1-D profiles. The X-Ds, characterized by seismic velocity jumps below the LAB, are found at multiple depths around 170, 220, 260, and 310 km, depending on location, accompanying the weakened radial anisotropy across these depths. The multiple MLDs are also identified in the cratonic regions, showing substantial variations in their seismological properties, including both positive or negative S-velocity jumps, which vary with location and depth. Our approach, incorporating azimuth-dependent RFs, enables the detection of localized changes in the upper mantle discontinuities and associated elastic properties, providing new insights into the complex layering of the upper mantle.

上地幔的横向结构变化产生了基于体波入射方向的接收函数（RFs）的方位依赖性。虽然RF的这些方位角变化在早期的RF反演研究中没有考虑到，但它们提供了一种成像上地幔界面局部变化的方法。在这项研究中，我们将方位相关的rf与多模面波结合到联合贝叶斯反演中，并将这种方法应用于澳大利亚的主要永久宽带站。所得模型显示了对事件方向的依赖性，通过识别p - s转换深度，我们构建了转换点的局部地图，反映了每个站点下方上地幔不连续体的局部横向变化。在澳大利亚东北部的CTAO台站，岩石圈向西北方向迅速增厚，深度从70 km到120-130 km，与西部克拉通区域的构造边界相对应。在澳大利亚西部和中部的测量站，岩石圈厚度也在稳定的克拉通内横向变化，尽管这些变化比澳大利亚东北部的变化更为缓慢。除了岩石圈-软流圈边界（LAB）外，岩石圈中部不连续面（MLDs）和x -不连续面（X-Ds）在局部1-D剖面上均可见。x - d的特征是地震速度在LAB以下跳跃，分布在170、220、260和310 km左右的多个深度，这取决于位置，伴随着这些深度的径向各向异性减弱。在克拉通区域也发现了多个MLDs，它们的地震学性质有很大的变化，包括正或负s速度跳变，随位置和深度的变化而变化。我们的方法结合了方位角相关的rf，可以检测上地幔不连续的局部变化和相关的弹性特性，为上地幔的复杂分层提供了新的见解。

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引用次数: 0

Sound velocities of (Al,Fe)-phase H and the seismic visibility of dense oxyhydroxides in Earth’s lower mantle （Al,Fe）相H的声速和下地幔致密氢氧化物的地震可见性

IF 1.9 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Physics of the Earth and Planetary Interiors

Pub Date : 2025-11-03 DOI: 10.1016/j.pepi.2025.107466

Benjamin T. Strozewski , Ojashvi Rautela , Johannes Buchen , Wolfgang Sturhahn , Takayuki Ishii , Itaru Ohira , Olivia Pardo , Jiyong Zhao , Thomas S. Toellner , Jennifer M. Jackson

Oxyhydroxide phases in the (Al,Fe)OOH–MgSiO₂(OH)

_{2}

system may form within oceanic lithosphere and transport hydrogen in their crystal structures into the lowermost mantle via cold, subducted slabs. In this work, we present new measurements of the seismic wavespeeds of the dense oxyhydroxide (Al,Fe)-phase H (Al_0.84Fe

_{0.07}^{3 +}

Mg_0.02Si_0.06OOH) to 100 GPa constrained by nuclear resonant inelastic X-ray scattering, incorporating previous constraints on the equation of state of this phase. At 300 K and pressure greater than 70 GPa, (Al,Fe)-phase H exhibits high P-wave speeds (

δ

lnV

_{P}

>

+12%) and low S-wave speeds (

δ

lnV

_{S}

<

−7%) relative to the preliminary reference Earth model (PREM). Experimentally determined sound velocities are incorporated into a model of a hydrous metabasalt including (Al,Fe)-phase H and compared with the seismic wavespeeds of pyrolitic mantle along appropriate adiabats. Hydrous metabasalt may reproduce an anti-correlation of negative shear wave velocity and positive bulk sound velocity at the upper edges of large, low velocity provinces when compared to pyrolitic mantle but has similar wavespeeds to PREM in this region. Hydrous metabasalt with conceivable concentrations of (Al,Fe)-phase H can be distinguished from PREM in V

_{S}

at mid-mantle depths (1100–1700 km) and in V

_{P}

at shallower depths (750–1000 km). Subducted hydrous metabasalt could contribute to scattering of seismic waves across the depth interval of the post-stishovite transition, which may be affected by the formation of (Al,Fe)-phase H.

（Al,Fe） OH - mgsio2 (OH)2体系中的氢氧化物相可能在海洋岩石圈内形成，并以其晶体结构将氢通过冷的俯冲板块输送到最下层的地幔中。在这项工作中，我们提出了在核共振非弹性x射线散射约束下致密氢氧化物（Al,Fe）相H （Al0.84Fe0.073+Mg0.02Si0.06OOH）到100 GPa的地震波速度的新测量结果，并结合了先前对该相状态方程的约束。在300 K和大于70 GPa的压力下，相对于初步参考地球模型（PREM），（Al,Fe）相H表现出高的纵波速度（δlnVP >+12%）和低的s波速度（δlnVS <−7%）。实验确定的声速被纳入一个含（Al,Fe）相H的含水变质玄武岩模型，并与沿适当绝热热岩地幔的地震波速度进行了比较。含水变质玄武岩在大低速省的上边缘与火成岩地幔相比，可能再现负横波速度和正体声速的反相关，但在该地区与PREM具有相似的波速。含（Al,Fe）相H的含水变质玄武岩可与中地幔深度（1100-1700 km）的VS和较浅深度（750-1000 km）的VP中的PREM区别。俯冲的含水变质玄武岩可能导致地震波在后闪辉岩过渡深度区间的散射，这可能受到(Al,Fe)- H相形成的影响。

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引用次数: 0