Earth and Planetary Science Letters最新文献_第5页

Fluvial responses to climate and tectonics throughout the Quaternary in the semi-arid Andes 半干旱的安第斯山脉第四纪河流对气候和构造的响应

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters

Pub Date : 2026-01-13 DOI: 10.1016/j.epsl.2026.119834

A. Binnie , S.A. Binnie , P. Victor , J-L. García , S. Heinze , T.J. Dunai

How major shifts in climate over the Quaternary have affected topography is unclear, especially in tectonically active regions. This shortcoming is largely due to a lack of robust chronologies of landscape evolution over the last few million years. Here we document a rare case, where a fluvial landscape has been preserved well enough to record its responses to tectonic and climatic shifts throughout the Quaternary. Our results show that aggradation of sediment fill near the Huasco River mouth in the semi-arid Central Andes at the beginning of the Quaternary corresponds to an increased upstream erosion rate and we propose that this was due to glacial expansion. At 1.3 Ma, the river began to incise into these sediments, and at 1.0 Ma the rate of downcutting increased notably. The fluvial incision coincides with the Early-Middle Pleistocene Transition, when the periodicity of global climate cycles lengthened. We integrate these findings with marine terrace dating in the same region and find that, although fundamental changes of aggradation and incision were coeval with global climate change, the average rates of fluvial incision over million-year timescales are comparable to rates of uplift. Our findings imply that the Central Andean landscape has responded to major shifts in the frequency of orbitally-driven climatic cycles, impacting topography that is governed by tectonic uplift over longer timescales. As the supply of sediments offshore to subduction zones is considered to exert a control on uplift, our results have broader implications for feedbacks between climatic and tectonic processes.

第四纪气候的重大变化是如何影响地形的还不清楚，特别是在构造活跃的地区。这一缺陷主要是由于缺乏过去几百万年景观演变的可靠年表。在这里，我们记录了一个罕见的案例，在这里，河流景观被保存得足够好，可以记录它对第四纪构造和气候变化的反应。我们的研究结果表明，第四纪初在半干旱的中部安第斯山脉Huasco河口附近的沉积物堆积与上游侵蚀速率的增加相对应，我们认为这是由于冰川扩张造成的。在1.3 Ma时，河流开始切入这些沉积物，在1.0 Ma时，河流的下切速率明显增加。河流切口与全球气候周期周期延长的早-中更新世过渡相吻合。我们将这些发现与同一地区的海相阶地定年相结合，发现虽然沉积和切割的基本变化与全球气候变化是同步的，但在百万年的时间尺度上，河流切割的平均速率与隆升速率相当。我们的研究结果表明，安第斯山脉中部的景观已经对轨道驱动的气候周期频率的重大变化做出了反应，在更长的时间尺度上影响着由构造隆起控制的地形。由于向俯冲带提供的近海沉积物被认为对隆升起着控制作用，我们的研究结果对气候和构造过程之间的反馈具有更广泛的意义。

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引用次数: 0

Calcium isotopes support rapid condensation of CAIs in the early solar nebula 钙同位素支持早期太阳星云中cai的快速凝聚

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters

Pub Date : 2026-01-12 DOI: 10.1016/j.epsl.2026.119825

Christopher A. Parendo , Stein B. Jacobsen , Michail I. Petaev

Calcium-aluminum-rich inclusions (CAIs), the oldest dated solids in the Solar System, preserve elemental and isotopic records of the thermal evolution of the early solar nebula—but some aspects, such as the processes driving large Ca-isotope variations, remain ambiguous. Previous studies observed isotopically light Ca in some CAIs, but whether these signatures arose from evaporation or condensation remains unresolved. We report new Ca-isotope and elemental data for 19 CAIs and 2 AOAs from the Allende meteorite and apply kinetic modeling to evaluate whether evaporation or condensation can account for the observed signatures. Our data confirm that CAIs exhibiting volatility-related REE fractionation have lighter Ca-isotope compositions than those with unfractionated REEs. Modeling demonstrates that evaporation cannot produce materials with both isotopically light Ca and near-chondritic Al/Ca ratios, requiring condensation as the cause of the observed Ca-isotope variations. Notably, modeled rates indicate that condensation occurred rapidly, over ∼10-1000 days, much faster than secular cooling of the solar nebula. These results constrain CAI thermal histories and offer insight into high-temperature processes in the early Solar System.

富钙铝包裹体（CAIs）是太阳系中最古老的固体，保存了早期太阳星云热演化的元素和同位素记录，但某些方面，如驱动大量ca同位素变化的过程，仍然不明确。以前的研究在一些CAIs中观察到同位素轻Ca，但这些特征是由蒸发还是冷凝引起的仍未解决。我们报告了来自Allende陨石的19个CAIs和2个AOAs的新的ca同位素和元素数据，并应用动力学模型来评估蒸发或冷凝是否可以解释观测到的特征。我们的数据证实，具有挥发性相关REE分馏的cai具有比未分馏的cai更轻的ca同位素组成。模拟表明，蒸发不能同时产生同位素轻Ca和近球粒Al/Ca比的物质，这需要冷凝作为观测到的Ca同位素变化的原因。值得注意的是，模拟速率表明，凝结发生得很快，超过了10-1000天，比太阳星云的长期冷却要快得多。这些结果限制了CAI热历史，并为早期太阳系的高温过程提供了见解。

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引用次数: 0

Frictional properties of Longmenshan sandstone under varying true triaxial stress and pore pressure conditions 不同真三轴应力和孔隙压力条件下龙门山砂岩的摩擦特性

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters

Pub Date : 2026-01-12 DOI: 10.1016/j.epsl.2026.119833

Zhiming Liang , Zhenyu Zhang , Beata Orlecka-Sikora , Shengpeng Hao , Kun Long

Pore pressure complicates the stress field in seismogenic zones and is an important factor controlling fault slip stability in injection-induced seismicity. However, the coupling effect of pore pressure and unequal horizontal stresses on the mechanics of earthquakes is constrained. Therefore, we perform velocity-stepping experiments under true triaxial stress conditions to investigate the influence of pore pressure on the frictional properties and fault stability. Our results show that pore pressure has two different effects on fault stability with the change of stress conditions. Potentially unstable behavior, which is characterized by a decrease in velocity dependence (a-b), is observed with increasing pore pressure under the constant horizontal stress condition. In contrast, pore pressure development promotes a more velocity-strengthening behavior under the constant effective horizontal stress condition, favoring stable slip. The different response in frictional stability of faults with elevated pore pressure is caused by the evolution of the rate-and-state parameter b, relating to the contact area. The strengthening stabilizing effect under the constant effective horizontal stress condition can be explained by the micro-morphology evolution of the bare fault surface, from discrete particle contact to powder distributed contact due to the asperity weakening with elevating pore pressure. Under the constant horizontal stress condition, the direct effect of increasing pore pressure reducing the effective normal stress promotes dilation, dominating the velocity dependence evolutionary tendency. These results have important implications for understanding the coupling effect of the stress field and pore pressure on controlling the fault stability.

孔隙压力使孕震区应力场复杂化，是控制注入地震活动中断层滑动稳定性的重要因素。然而，孔隙压力和不等水平应力对地震力学的耦合作用是有限的。因此，我们在真三轴应力条件下进行了速度步进实验，以研究孔隙压力对摩擦特性和断层稳定性的影响。结果表明，随着应力条件的变化，孔隙压力对断层稳定性有两种不同的影响。在恒定水平应力条件下，随着孔隙压力的增加，可以观察到潜在的不稳定行为，其特征是速度依赖性的降低（a-b）。相比之下，在恒定有效水平应力条件下，孔隙压力的发展促进了更多的速度强化行为，有利于稳定滑移。高孔隙压力下断层摩擦稳定性的不同响应是由与接触面积相关的速率-状态参数b的演化引起的。恒定有效水平应力条件下的强化稳定效应可以解释为裸露断层表面的微观形态演变，即随着孔隙压力的升高，粗糙性减弱，从离散的颗粒接触到粉末分布接触。在水平应力恒定的条件下，增大孔隙压力降低有效正应力的直接作用促进了膨胀，主导了速度依赖的演化趋势。这些结果对认识应力场和孔隙压力耦合作用对控制断层稳定性的影响具有重要意义。

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引用次数: 0

Trace element and stable Sr isotope evidence for seamount-driven variations in subducted sediment and carbon recycling in Central America 中美洲海山驱动俯冲沉积物变化和碳循环的微量元素和稳定Sr同位素证据

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters

Pub Date : 2026-01-12 DOI: 10.1016/j.epsl.2026.119829

Alexander J. Hammerstrom , Rita Parai , Richard W. Carlson , Vlad C. Manea , Marina Manea , Stephen J. Turner

Subduction zone fluxes control the long-term evolution of Earth’s interior, surface reservoirs, and climate. To better constrain these fluxes, we present new δ⁸⁸Sr measurements of lavas and sediments from Nicaragua, a key site of carbonate subduction. δ⁸⁸Sr data are interpreted alongside existing trace element data to assess the value of Sr stable isotopes as a quantitative subduction tracer. Trace element systematics (1) constrain ambient mantle enrichment and extent of melting (Nb vs. Yb), (2) show that the arc’s Sr budget is dominated by melts of subducting altered ocean crust (AOC) (Yb/Sr vs. ⁸⁷Sr/⁸⁶Sr), and (3) verify that incompatible element compositions are controlled by variable recycling of hemipelagic vs. carbonate sediments (Th/Sr vs. ⁸⁷Sr/⁸⁶Sr). Other trace element ratios, such as Nd/Sr, require varying AOC melt compositions. A full forward trace element model confirms the viability of this interpretation. The new δ⁸⁸Sr data build on and corroborate these findings. The range of δ⁸⁸Sr in arc lavas cannot be explained by sediment proportions or ambient mantle compositions, but instead requires δ⁸⁸Sr heterogeneity in the subducting oceanic crust. Notably, AOC δ⁸⁸Sr appears to co-vary with the proportion of hemipelagic vs. carbonate sediment recycled to the arc. We suggest these variations reflect seamount subduction, where seamounts with heterogeneous δ⁸⁸Sr, emplaced during the transition in marine sediment deposition, cap carbonate layers and control their transfer to the arc. Within this framework, we estimate 45% to 60% of subducted carbonate-derived carbon is returned to the arc, consistent with volcanic gas–based estimates.

俯冲带的通量控制着地球内部、地表储层和气候的长期演化。为了更好地约束这些通量，我们对碳酸盐岩俯冲的关键地点尼加拉瓜的熔岩和沉积物进行了新的δ⁸⁸Sr测量。将δ⁸⁸Sr数据与现有的微量元素数据一起进行解释，以评估Sr稳定同位素作为定量俯冲示踪剂的价值。微量元素系统(1)限制了周围地幔的富集程度和熔融程度（Nb vs. Yb），(2)表明弧的Sr平衡主要由俯冲蚀变洋壳（AOC）的熔体（Yb/Sr vs.⁸⁷Sr/⁸⁶Sr）控制，(3)验证了不相容元素组成受半深海沉积物和碳酸盐沉积物的不同再循环控制（Th/Sr vs.⁸⁷Sr/⁸⁶Sr）。其他微量元素的比例，如Nd/Sr，需要不同的AOC熔体成分。一个完整的正演微量元素模型证实了这种解释的可行性。新的δ⁸⁸Sr数据建立并证实了这些发现。弧熔岩中δ⁸⁸Sr的范围不能用沉积物比例或周围地幔成分来解释，而需要俯冲洋壳中δ⁸⁸Sr的非均质性来解释。值得注意的是，AOC δ⁸⁸Sr似乎与半深海沉积物和碳酸盐沉积物回收到弧的比例共同变化。我们认为这些变化反映了海山的俯冲作用，海山在海相沉积过渡时期侵位，具有非均匀的δ⁸⁸Sr，盖住了碳酸盐层并控制了它们向弧的转移。在这个框架内，我们估计45%至60%的俯冲碳酸盐衍生碳返回到弧中，与基于火山气体的估计一致。

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引用次数: 0

Subduction-driven mantle flow beneath and around the Philippine Sea plate from seismic anisotropy 从地震各向异性看菲律宾海板块下方和周围俯冲驱动的地幔流

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters

Pub Date : 2026-01-10 DOI: 10.1016/j.epsl.2026.119827

Jonathan Wolf , Frederik Link , Maureen D. Long , Edward Garnero , John D. West

Shear-wave splitting illuminates mantle flow and subduction zone dynamics but is typically inferred near stations or earthquakes, limiting studies in sparsely instrumented regions away from earthquakes. Where stations or earthquakes are present, fast splitting directions are often parallel to the nearest trench, which has yet to be fully understood and reconciled with geodynamic flow predictions. Here we use a novel technique that leverages surface-reflected PS and PPS waves to overcome limitations in coverage beneath the Philippine Sea plate, which is surrounded on all sides by subducting slabs. Upper mantle deformation in this region, best explained by mantle flow below 250 km depth, is generally different from the absolute plate motion direction and instead shaped by the surrounding subduction zones. We interpret our observations as likely evidence for trench-parallel flow in the mantle wedge beneath the Ryukyu, Nankai, and parts of the Izu-Bonin subduction zones, as well as toroidal flow around the Ryukyu and Mariana slab edges. Beneath the Pacific Plate, near the Mariana subduction zone, flow is trench-perpendicular. Our results are generally consistent with flow patterns predicted by previous geodynamic models, and provide a new constraint on subduction-driven deformation in the region.

横波分裂阐明了地幔流动和俯冲带动力学，但通常是在台站或地震附近推断出来的，限制了远离地震的仪器稀少地区的研究。在有台站或地震的地方，快速分裂的方向往往与最近的海沟平行，这一点尚未得到充分理解，并与地球动力学流预测相协调。在这里，我们使用了一种新技术，利用表面反射的PS和PPS波来克服菲律宾海板块下覆盖范围的限制，菲律宾海板块四面被俯冲板块包围。该地区的上地幔变形通常与板块的绝对运动方向不同，而是受周围俯冲带的影响，250km深度以下的地幔流动是解释该地区上地幔变形的最好方法。我们将我们的观测结果解释为在琉球、南开和部分伊扎-波宁俯冲带的地幔楔下的海沟平行流动，以及在琉球和马里亚纳板块边缘周围的环形流动的可能证据。在太平洋板块下方，靠近马里亚纳俯冲带，水流与海沟垂直。研究结果与以往地球动力学模型预测的流动模式基本一致，为该区俯冲驱动变形提供了新的约束条件。

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引用次数: 0

First-year sea ice history in the Arctic Ocean inferred from ancient DNA of Polerella glacialis over the past 50,000 years 北冰洋第一年的海冰历史，是根据过去5万年的冰柱藻的古代DNA推断出来的

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters

Pub Date : 2026-01-09 DOI: 10.1016/j.epsl.2025.119809

Kyle Michael James Mayers , Nele Manon Vollmar , Tristan Cordier , Agnes Katharina Maria Weiner , Juliane Müller , Aud Larsen , Stijn De Schepper

引用次数: 0

Global evidence for the contribution of Earth’s surface topography to seismic PP precursor waves 地球表面地形对地震PP前驱波贡献的全球证据

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters

Pub Date : 2026-01-08 DOI: 10.1016/j.epsl.2025.119814

Tuo Zhang , Christoph Sens-Schönfelder , Ye Yuan

Seismic precursors to the PP phase have long been attributed to scattering from mid-mantle heterogeneities, often interpreted as signatures of subducted slab remnants. However, using a global dataset of high-quality records from shallow earthquakes, we identify a signal of consistent, progressively increasing energy over time preceding PP arrivals, which strongly correlates with PP surface reflection points, particularly over continental regions. Beamforming analysis reveals two distinct slowness branches in the precursor energy that align with theoretical predictions for P waves deflected by topographic slopes. Monte Carlo simulations incorporating realistic surface topography accurately reproduce the observed arrival times and amplitudes of the precursors, whereas models based solely on mantle scattering fail to match the data. These results demonstrate that surface topography, rather than the mantle structures, dominates the generation of globally observed PP precursors. This reinterpretation calls for caution in using PP precursors to infer crust or mantle heterogeneity and highlights the critical role of surface effects in seismic waveform modelling.

PP期的地震前兆长期以来被认为是中地幔非均质散射所致，通常被解释为俯冲板块残余物的特征。然而，利用全球浅层地震的高质量记录数据集，我们发现在PP到达之前，有一个一致的、逐渐增加的能量信号，这与PP表面反射点密切相关，特别是在大陆地区。波束形成分析揭示了前驱能量中两个不同的慢度分支，这与地形坡度偏转的P波的理论预测相一致。结合真实地表地形的蒙特卡罗模拟准确地再现了观测到的前体到达时间和振幅，而仅基于地幔散射的模型无法匹配数据。这些结果表明，地表地形，而不是地幔结构，主导了全球观测到的PP前体的产生。这种重新解释要求谨慎使用PP前体来推断地壳或地幔的非均质性，并强调地表效应在地震波形建模中的关键作用。

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引用次数: 0

Shifting carbonate burial between oceanic and continental crust across Earth history 在整个地球历史中，在海洋和大陆地壳之间转移碳酸盐埋藏

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters

Pub Date : 2026-01-05 DOI: 10.1016/j.epsl.2025.119810

Jon M. Husson , Shanan E. Peters

Chemical weathering fluxes determine carbonate burial rates on geologic timescales, but the locus of carbonate burial is sensitive to tectonic and biologic boundary conditions that have changed across Earth history. Depositional setting is important because sediments on oceanic crust are readily recycled on the timescale of seafloor subduction, whereas sediments on continental crust can be sequestered over much longer durations. Here we present records of carbonate abundance in continental sediments for the past 3600 million years based on the North American components of the Macrostrat geologic column database and globally-distributed geological map units. Whether carbonate abundance is measured in absolute (area, volume) or in relative terms (carbonate normalized by total sediment), secular patterns emerge. In the Precambrian, carbonate abundance in continental crust is generally low. In the Phanerozoic, it climbs abruptly to a Paleozoic maximum and then declines towards the present. Decrease in shelf carbonate abundance across the Phanerozoic has been previously documented, driven in part by evolving paleogeography and the early Mesozoic evolution of pelagic calcifiers, which helped to shift carbonate burial from continental to oceanic crust. A Precambrian low in continental carbonate has received less attention. Here we propose that carbonate burial during much of the Precambrian was dominated by accumulation on (or within) oceanic crust and then shifted to continental crust in the early Paleozoic. Carbonate burial fluxes calibrated from the surviving rock record are an order of magnitude larger in the early Paleozoic than they appear to have been in the Proterozoic, with a step-wise increase occurring during the Ediacaran-Cambrian transition. This observation implies a large and relatively abrupt shift in the principal locus of CaCO₃ burial, from short-lived oceanic crust during much of the Proterozoic to longer-surviving continental crust in the early Paleozoic. Oceanic crust became, once again, a significant locus for carbonate accumulation during the Mesozoic and Cenozoic. The Paleozoic accommodation of most of the global carbon burial flux on the continents has many implications, including for secular changes in carbon cycling rates and the sensitivity of the surface environment to CO₂ injections.

化学风化通量决定了地质时间尺度上的碳酸盐埋藏速率，但碳酸盐埋藏的位置对地球历史上不断变化的构造和生物边界条件很敏感。沉积环境很重要，因为海洋地壳上的沉积物在海底俯冲的时间尺度上很容易再循环，而大陆地壳上的沉积物可以在更长的时间内被隔离。本文基于macrostrata地质柱数据库的北美成分和全球分布的地质图单元，给出了过去36亿年大陆沉积物中碳酸盐丰度的记录。无论碳酸盐丰度是以绝对（面积、体积）还是以相对（碳酸盐按总沉积物归一化）来衡量，都会出现长期模式。在前寒武纪，大陆地壳碳酸盐丰度普遍较低。在显生宙，它突然攀升到古生代的最大值，然后向现在下降。在显生宙，陆架碳酸盐丰度的减少已经有文献记载，部分原因是古地理的进化和中生代早期上层钙化物的进化，这有助于将碳酸盐埋藏从大陆地壳转移到海洋地壳。陆相碳酸盐岩的前寒武纪低沉积受到的关注较少。本文认为，在前寒武纪的大部分时间里，碳酸盐岩的埋藏主要是在海洋地壳上（或在海洋地壳内）聚集，然后在早古生代转移到大陆地壳。根据现存岩石记录校准的碳酸盐埋藏通量在早古生代比在元古代要大一个数量级，在埃迪卡拉纪-寒武纪过渡期间，碳酸盐埋藏通量逐步增加。这一观察结果表明，CaCO3埋藏的主要地点发生了一次较大且相对突然的转变，从元古代大部分时间的短暂海洋地壳到古生代早期存活时间较长的大陆地壳。在中生代和新生代，洋壳再次成为碳酸盐岩聚集的重要场所。古生代对大陆上大部分全球碳埋藏通量的调节具有许多意义，包括碳循环速率的长期变化和地表环境对二氧化碳注入的敏感性。

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引用次数: 0

Coupled trace element and Hf-isotope measurements of Hadean through Paleoarchean zircons from the Singhbhum Craton indicate derivation from a long-lived, mantle-derived protocrust singhbham克拉通古宙至古太古代锆石的微量元素和hf同位素耦合测量表明，它起源于一个长寿命的幔源原地壳

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters

Pub Date : 2025-12-31 DOI: 10.1016/j.epsl.2025.119813

Heather Kirkpatrick , Emily Stoll , Nadja Drabon

Due to the dearth of rock records during the Hadean, little is known about early crustal chemistry and geodynamics. Here, we present zircon trace and rare earth element and Lu-Hf measurements of zircons ∼ 3.3 Ga to ∼ 4.2 Ga from the Older Metamorphic Tonalitic Gneiss in the Singhbhum Craton to better understand geodynamic changes during the Hadean and Archean. We find decreasing, subchondritic zircon ε_HfT among zircons > 3.7 Ga and no indication of addition of new crustal material during the Hadean after initial formation of this protocrust. Trace and rare earth element analyses of > 3.7 Ga grains indicate derivation from a source heavily influenced by the enriched mantle with little evidence for flux melting, and no clear evidence for deep melting. At ∼ 3.7 Ga, we observe an average ε_HfT increase indicating new additions of juvenile felsic material. These zircons still show predominantly mantle-like trace elements, but with the appearance of some arc-like signatures and evidence for crustal thickening. This period of crustal reorganization speaks towards a shift in geodynamic regime characterized by the onset of communication between the mantle and the crust from which the zircons formed at this location. The presence of long-lived, mantle-derived protocrust in both India and South Africa appears to suggest the possibility of a local stagnant lid, albeit more data is necessary to confirm this. The presence of a transition of ε_HfT data globally may point towards an important, diachronous period of crustal reorganization 3.9 – 3.6 Ga ago.

由于冥古宙时期岩石记录的缺乏，人们对早期地壳化学和地球动力学知之甚少。为了更好地了解冥古宙和太古宙的地球动力学变化，我们对兴兴克拉通古变质调性片麻岩~ 3.3 ~ 4.2 Ga锆石进行了锆石痕量锆石、稀土元素和Lu-Hf测量。在3.7 Ga的锆石中，我们发现亚球粒锆石εHfT呈下降趋势，在该原地壳初始形成后的冥古宙没有新的地壳物质加入的迹象。对>； 3.7 Ga颗粒的痕量和稀土元素分析表明，其来源受到富集地幔的严重影响，几乎没有通量熔融的证据，也没有深部熔融的明确证据。在~ 3.7 Ga，我们观察到平均εHfT增加，表明新添加了幼长英质物质。这些锆石仍主要显示出地幔样的微量元素，但出现了一些弧状特征和地壳增厚的证据。这一时期的地壳重组预示着地球动力学机制的转变，其特征是地幔和地壳之间开始交流，锆石由此形成。印度和南非存在着寿命较长的、源自地幔的原地壳，这似乎表明当地可能存在一个停滞的地壳盖，尽管需要更多的数据来证实这一点。全球范围内εHfT数据的转变可能指向3.9 ~ 3.6 Ga前一个重要的地壳重组历时期。

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引用次数: 0

Dual controls on lithospheric dripping: The role of mantle flow and orogen scale 岩石圈滴水的双重控制：地幔流和造山带尺度的作用

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters

Pub Date : 2025-12-31 DOI: 10.1016/j.epsl.2025.119795

Qiuling Wang , Huilin Wang , Zhuang Li

Lithospheric dripping is a fundamental mechanism for recycling thickened lithosphere in orogens, but its dynamic controls remain incompletely understood. Classical models emphasizing intra-lithospheric dynamics predict symmetric lithosphere downwelling with coupled surface subsidence/uplift and volcanic activities, consistent with observations in small orogens. However, these models cannot explain the asymmetric dripping geometries and spatially decoupled magmatic-topographic signals observed in some large orogens. In this study, we use numerical models to investigate how mantle flow interacts with different orogenic architectures to modulate dripping styles. Our results show that thin and cold orogens maintain strong intra-lithospheric coupling that restricts mantle flow influence, producing classical dripping behavior characterized by localized, near-vertical instability descent and symmetric surface responses. In contrast, thick, hot, and moderately wide orogens with weak intra-lithospheric viscous coupling enable mantle flow to entrain and amplify lithospheric drips, resulting in extensive lithospheric thinning and laterally offset topographic and magmatic responses. Orogen width influences the amount and extent of lithospheric thinning. Broad orogens that maintain a high lithospheric viscosity result in more localized removal. Lithosphere thinning is restricted to drip-adjacent zones. These results can reconcile the diverse dripping styles and surface responses observed in various orogens, demonstrating that lithospheric dripping is a tiered process governed by the interplay of mantle flow and orogen-scale properties, where orogenic thermal-mechanical characteristics control sensitivity to basal flow. The results offer new insights into understanding mantle-lithosphere interactions and scale-dependent orogenic evolution.

岩石圈滴落是造山带岩石圈增厚再循环的基本机制，但其动力学控制机制尚不完全清楚。强调岩石圈内动力学的经典模型预测岩石圈的对称下移与地表沉降/隆升和火山活动的耦合，与小造山带的观测结果一致。然而，这些模型不能解释在一些大型造山带观测到的不对称滴状几何和空间解耦的岩浆地形信号。在这项研究中，我们使用数值模型来研究地幔流动如何与不同的造山带结构相互作用以调节滴水方式。研究结果表明，薄造山带和冷造山带保持着强烈的岩石圈内耦合，限制了地幔流的影响，形成了以局部、近垂直不稳定下降和对称地表响应为特征的经典滴水行为。相比之下，厚、热、宽适中的造山带与较弱的岩石圈内黏性耦合使地幔流动夹带并放大岩石圈滴液，导致岩石圈广泛变薄和横向偏移的地形和岩浆响应。造山带宽度影响岩石圈减薄的数量和程度。维持高岩石圈粘度的宽造山带导致更局部的去除。岩石圈减薄仅限于与水滴相邻的区域。这些结果与在不同造山带观测到的不同滴注样式和地表响应相一致，表明岩石圈滴注是一个受地幔流和造山带尺度性质相互作用支配的分层过程，造山带热力学特征控制着对基流的敏感性。研究结果为理解地幔-岩石圈相互作用和规模依赖性造山演化提供了新的见解。

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