Journal of Asian Earth Sciences最新文献_第7页

First quantitative constraints on the Aiyongco Fault: A record of distributed strain in the western Bangong-Nujiang Fault Zone, Tibetan Plateau

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Asian Earth Sciences

Pub Date : 2026-02-15 Epub Date: 2025-11-29 DOI: 10.1016/j.jseaes.2025.106878

Haoxuan Zeng , Dewen Li , Jinzhao Li , Chong Zhang , Yuquan Jiang , Gaojian Miao , Zhenming Liu

The Bangong-Nujiang Fault Zone (BNFZ) separates the Qiangtang terrane to the north from the Lhasa terrane to the south within the Tibetan Plateau. How tectonic strain is accommodated across the western segment of this major suture zone remains a key unresolved question. This study focuses on the Aiyongco Fault, a major NWW-trending structure within the western BNFZ. We employ ground investigations, satellite imagery, UAV photogrammetry, trenching, and geochronological dating (¹⁴C and ¹⁰Be) to constrain its spatial distribution, timing of recent activities, slip rates, and paleoearthquakes. Our study demonstrates that the latest activity on the Aiyongco Fault occurred between 7.8 and 0.47 ka BP, i.e., during the middle to late Holocene, and that the horizontal slip rate ranges from 0.18 ± 0.01 mm/yr to 0.77 ± 0.04 mm/yr, with a vertical slip rate of 0.05 ± 0.01 mm/yr and a single-event horizontal displacement of 1.02 ± 0.17 m. The fault has experienced at least six paleoearthquake events since 21.07 ka, with an average recurrence interval of approximately 4.3–7.0 ka. These findings provide the first quantitative constraints on this active fault, suggesting that tectonic deformation in the western Tibetan Plateau is highly distributed. Our results offer foundational data for regional tectonic models and seismic hazard assessment in this area.

构造应变如何在这个主要缝合带的西段被调节仍然是一个关键的未解决的问题。本文以北北纬向的爱永错断裂为研究对象。我们使用地面调查、卫星图像、无人机摄影测量、沟槽和地质年代测定（14C和1⁰Be）来限制其空间分布、最近活动的时间、滑动率和古地震。研究表明，爱永错断裂的最新活动发生在7.8 ~ 0.47 ka BP之间，即全新世中晚期，水平滑动速率为0.18±0.01 mm/yr ~ 0.77±0.04 mm/yr，垂直滑动速率为0.05±0.01 mm/yr，单次水平位移为1.02±0.17 m。该断裂自21.07 ka以来至少经历了6次古地震事件，平均复发间隔约为4.3 ~ 7.0 ka。研究结果为该区区域构造模型和地震危险性评价提供了基础数据。

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引用次数: 0

Tectonic and climate control on the stratigraphic cycles in a Late Paleozoic evaporitic basin in NW China 构造和气候对西北晚古生代蒸发盆地地层旋回的控制

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Asian Earth Sciences

Pub Date : 2026-02-15 Epub Date: 2025-12-02 DOI: 10.1016/j.jseaes.2025.106898

Kuanhong Yu , Shuo Du , Yingchang Cao , Zi Wang

The Fengcheng Formation in the Junggar Basin, northwestern China, represents a suite of deposits formed in a hydrologically closed, alkaline saline lake during the Late Paleozoic. This formation hosts high-quality source rocks (oil shales) and significant trona resources. Closed-basin lacustrine systems exhibit stratigraphic architectures that are fundamentally distinct from those of marine or open-lake settings; consequently, conventional sequence stratigraphic models are often inadequate for interpreting the distribution of trona and oil shale resources within such confined depositional systems. Based on integrated analyses of drilling sequences, well logs, and seismic profiles, we identify four key findings: (1) Three third-order sequences can be delineated using lithostratigraphic patterns and seismic-stratigraphic relationships; (2) The Mahu Sag remained predominantly underfilled throughout most of the depositional history, evolving into a balanced-fill basin only at the end of Sequence 3 (SQ3); (3) Trona deposition occurred during arid phases within repeated climatic cycles, with the Fengcheng Formation preserving four long-term cycles, each comprising multiple intermediate- and short-term climatic fluctuations; (4) The highest-quality oil shales accumulated during the transgressive systems tracts (TST) of SQ1 and SQ2, coinciding with periods of rising lake levels. Additional oil shale intervals formed at the onset of individual cycles when lake levels were elevated. These findings offer a comprehensive stratigraphic framework for understanding the spatial and temporal distribution of trona and oil shale resources in a Late Paleozoic alkaline saline lake system characterized by asymmetric basin geometry.

准噶尔盆地丰城组是一套晚古生代水文封闭的碱性盐湖沉积。该地层拥有优质烃源岩（油页岩）和重要的天然气资源。封闭盆地湖泊体系的地层结构与海相或开阔湖泊的地层结构有本质的区别；因此，常规的层序地层学模型往往不足以解释此类封闭沉积体系中地下和油页岩资源的分布。通过对钻井序列、测井曲线和地震剖面的综合分析，得出了四个重要发现：(1)利用岩石地层模式和地震-地层关系圈定了3个三级层序；(2)马湖凹陷在大部分沉积历史中以欠充填为主，仅在层序3 （SQ3）末演化为平衡充填盆地；(3) Trona沉积发生在干旱期，在重复的气候周期中，丰城组保存了4个长期周期，每个周期包含多个中短期气候波动；(4)油页岩质量最高的时期为SQ1和SQ2海侵体系域（TST），与湖泊水位上升时期一致。当湖泊水位升高时，在个别旋回开始时形成额外的油页岩层段。这些发现为认识具有不对称盆地几何特征的晚古生代碱性盐湖体系中烃类和油页岩资源的时空分布提供了一个全面的地层框架。

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引用次数: 0

Dolomitization mechanism for thick bedded dolostones of the Ordovician Majiagou Formation (Member 5) in the eastern Ordos Basin, China 鄂尔多斯盆地东部奥陶系马家沟组（五段）厚层状白云岩白云化机制

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Asian Earth Sciences

Pub Date : 2026-02-15 Epub Date: 2025-11-28 DOI: 10.1016/j.jseaes.2025.106889

Zhenmeng Sun, Xiangjie Cui, Huan Liu, Jian Cao, Xiancai Lu

The genesis of thick bedded dolostones is considered closely related to the “Dolomite Problem”. This study investigates the mineralogical, sedimentological, and geochemical characteristics of thick bedded dolostones of the Ordovician Majiagou Formation (Member 5) in the eastern Ordos Basin, China. These dolostones consist of stacked meter to submeter scale thin bedded cycles, characterized by three key facies: cryptocrystalline dolostone with spherical gypsum molds, microcrystalline dolostone with nonplanar crystal boundaries and lath shaped gypsum pseudomorphs, and fine crystalline dolostone with planar boundaries lacking gypsum. The vertical distribution of these facies correlates with sea level cyclicity and geochemical variations in dolomite stoichiometry, indicating that dolomitization was controlled by high frequency sea level oscillations. The preservation of horizontal gypsum pseudomorphs, together with diagnostic Th/U ratios and bell-shaped REE patterns, supports a low energy, restricted cratonic setting. We apply a syndepositional model wherein evaporative concentration in a warm, shallow greenhouse sea led to calcite and gypsum precipitation, elevating the Mg/Ca ratio and triggering dolomitization. The resulting dense brine percolated downward, replacing unconsolidated calcareous precursors to form the observed dolostone types. This case demonstrates that high frequency sea level oscillations and their resultant thin bedded cycle stacking can constitute an efficient formation mechanism for thick bedded dolostones in cratonic basins.

厚层白云岩的成因被认为与“白云岩问题”密切相关。研究了鄂尔多斯盆地东部奥陶系马家沟组（五段）厚层状白云岩的矿物学、沉积学和地球化学特征。这些白云岩由米级至亚米级的薄层旋回堆积而成，具有3个关键相：具有球形石膏模的隐晶白云岩、具有非平面晶界和板条状石膏假晶的微晶白云岩和具有平面晶界但不含石膏的细晶白云岩。这些相的垂向分布与海平面旋回性和白云岩化学计量学的地球化学变化有关，表明白云化受海平面高频振荡的控制。水平石膏伪晶的保存，以及诊断Th/U比率和钟形REE模式，支持低能量，受限制的克拉通环境。我们采用了一个同沉积模型，其中温暖的浅温室海的蒸发浓度导致方解石和石膏沉淀，升高Mg/Ca比并引发白云化。由此产生的浓盐水向下渗透，取代未固结的钙质前体，形成观察到的白云岩类型。该实例表明，高频海平面振荡及其形成的薄层旋回叠加是克拉通盆地厚层白云岩的有效形成机制。

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引用次数: 0

New paleoseismological constraints on the seismic activity along the eastern Tunka Fault (SW Baikal Rift) 东通卡断裂带（西南贝加尔湖裂谷）地震活动的古地震学新约束

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Asian Earth Sciences

Pub Date : 2026-02-15 Epub Date: 2025-12-04 DOI: 10.1016/j.jseaes.2025.106901

A.A. Chebotarev , A.V. Arzhannikova , S.G. Arzhannikov , J.-F. Ritz , A.V. Avagyan

The Tunka Fault, a major active structure in the southwestern Baikal Rift system, poses a significant seismic hazard, yet its paleoseismic history remains poorly constrained. We present new paleoseismic data from trenches across its eastern Tory segment, constrained with morphotectonic analysis and radiocarbon dating. Our results reveal two Holocene earthquakes, corresponding to the E2 and E3 events identified in previous studies along the Mondy, Tunka, and Main Sayan faults. These three faults have been interpreted as having produced seismic clusters at least four times in the Late Pleistocene-Holocene times. Our radiocarbon data allow constraining more tightly the ages of the E2 and E3 events to 3170–3399 and 8453–8540 cal yr BP, respectively. Morphotectonic analysis of the Tory site, together with published data along the adjacent section of the Tunka Fault, showed that the average amplitude of displacement per event along the slip vector was 2.1 m, corresponding to a magnitude of Mw 7.3. In some cases, all fault segments seem to have ruptured simultaneously over a length of 200 km, while in others cases, only segments striking E-W and NW-SE directions ruptured with a reverse slip component. Fault segments with normal slip component ruptured with a delay, but with a similar recurrence interval. These results highlight the potential for multi-fault ruptures in the Baikal region and challenge existing seismic hazard models. Our study provides critical input for revising probabilistic seismic hazard assessments and underscores the need to consider fault interaction in tectonic settings with complex block boundaries.

Tunka断裂是贝加尔湖裂谷系西南部的一个主要活动构造，具有重大的地震危险性，但其古地震史却知之甚少。通过形态构造分析和放射性碳定年，我们提出了新的古地震数据，这些数据来自东托里段的沟槽。我们的研究结果揭示了两个全新世地震，对应于先前研究中发现的沿着Mondy， Tunka和Main Sayan断层的E2和E3事件。这三条断层被解释为在晚更新世-全新世期间至少四次产生了地震群。我们的放射性碳数据可以更严格地将E2和E3事件的年龄分别限制在3170-3399和8453-8540 calyr BP之间。托里地区的形态构造分析，连同Tunka断层邻近部分的已发表数据，表明沿滑动矢量每次事件的平均位移幅度为2.1 m，相当于7.3 Mw的震级。在某些情况下，所有断层段似乎在200公里长的范围内同时破裂，而在其他情况下，只有E-W和NW-SE方向的断层段破裂，并伴有逆滑成分。具有正常滑动分量的断层段的破裂具有延迟性，但具有相似的复发间隔。这些结果突出了贝加尔湖地区多断层破裂的可能性，并对现有的地震危险性模型提出了挑战。我们的研究为修正概率地震危险性评估提供了关键的输入，并强调了在具有复杂块体边界的构造环境中考虑断层相互作用的必要性。

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引用次数: 0

Jurassic tectonic activity and geodynamic implications of the eastern segment of the Altyn Tagh Fault, Northwest China 阿尔金断裂带东段侏罗系构造活动及其地球动力学意义

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Asian Earth Sciences

Pub Date : 2026-02-15 Epub Date: 2025-12-02 DOI: 10.1016/j.jseaes.2025.106899

Huaiwei Feng , Shumei Xu , Jinduo Wang , Hongzhuang Cui , Xiangfeng Wu

The Altyn Tagh Fault (ATF), forming the northern boundary of the present-day Tibetan Plateau, cuts across multiple structural units of northern Tibetan Plateau and exerts a fundamental control on the framework of the Mesozoic-Cenozoic sedimentary basins. Although numerous studies have investigated the timing and magnitude strike-slip motion along the ATF, its Jurassic evolution remains poorly constrained. In this study, we integrate sedimentological, structural, geophysical, and thermochronological approaches to examine the Jurassic tectonic activity of the eastern segment of the ATF. Analyses of soft-sediment deformation structures indicate that the Altyn Tagh Range experienced incipient, submarine uplift without the development of significant surface topography. The recognition of Jurassic stratigraphic contacts and flower structures in seismic profiles further suggests localized uplift and strike-slip deformation. Detrital zircon U-Pb age spectra exhibit near-source signatures, implying restricted lateral displacement along the fault during the Jurassic. Moreover, aeromagnetic anomaly interpretation combined with low-temperature thermochronology indicates that the ATF operated within a dynamic framework involving pre-Jurassic southward deep subduction of the Tarim Block and northward shallow subduction of the Qaidam Block, mediated by a deep lithosphere-mantle ductile shear zone. Under this tectonic configuration, the fault experienced limited strike-slip motion, segmented activity, and localized uplift during the Jurassic.

尽管许多研究已经调查了沿ATF的走滑运动的时间和规模，但其侏罗纪演化仍然知之甚少。在这项研究中，我们综合了沉积学、构造学、地球物理和热年代学的方法来研究ATF东段的侏罗纪构造活动。软沉积变形构造分析表明，阿尔金山脉经历了早期的海底隆升，没有明显的地表地形发育。地震剖面对侏罗系地层接触和花状构造的识别进一步表明了局部隆升和走滑变形。碎屑锆石U-Pb年龄谱表现出近源特征，表明侏罗纪时期沿断层侧向位移受限。此外，航磁异常解释结合低温热年代学表明，ATF是在塔里木地块前侏罗世向南深俯冲和柴达木地块向北浅俯冲的动力框架内运行的，并以深部岩石圈-地幔韧性剪切带为介质。在这一构造构型下，断层在侏罗纪经历了有限的走滑运动、分段活动和局部隆升。

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引用次数: 0

Corrigendum to “Architecture and evolution of the carbonate platform margin of the Lower Cambrian Xiaoerbrak Formation, northwestern Tarim Basin, China” [J. Asian Earth Sci. 274 (2024) 106279] “塔里木盆地西北部下寒武统小尔布拉克组碳酸盐岩台地边缘构造与演化”勘误[J]。亚洲地球科学，274 (2024)106279

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Asian Earth Sciences

Pub Date : 2026-02-15 Epub Date: 2025-12-18 DOI: 10.1016/j.jseaes.2025.106912

Ziyi Wang, Zhiqian Gao, Tailiang Fan

引用次数: 0

Geochemistry and origin of geofluids from the Muji carbonic springs in the northeastern Pamir Plateau, NW China: Implications for regional fault activities 帕米尔高原东北部无印良市碳酸泉地流体地球化学特征及成因：对区域断裂活动的启示

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Asian Earth Sciences

Pub Date : 2026-02-15 Epub Date: 2025-11-26 DOI: 10.1016/j.jseaes.2025.106882

Li Zhang , Xiangxian Ma , Yuanyuan Shao , Jianzhen Chen , Zhongping Li , Lijuan Zhang , Chunhui Cao , Georgy Chelnokov , Vasilii Lavrushin , Guodong Zheng

The Muji carbonic springs are typical tectonically controlled springs. To understand the origin and circulation process of geofluids from these springs, twenty-eight water samples and fourteen gas samples were collected and analyzed for their chemical and isotopic compositions. The hydrochemical type of these springs is classified as the Ca-HCO₃ type, primarily due to the dissolution of carbonate minerals. These waters have δD values ranging from −106.8 ‰ to −89.6 ‰ and δ¹⁸O values from −15.1 ‰ to −12.6 ‰, indicating that their primary origin is meteoric precipitation at different altitudes. The waters infiltrated through the fault zones to depths of 5.0±0.7 km, and mixed with deep fluids as well as shallow groundwater before being discharged at the surface. Gases from these springs have δ¹³C_CO2 values ranging from −5.8 ‰ to −2.9 ‰ and their ³He/⁴He ratios are 0.08 to 0.12 times the atmospheric value (³He/⁴He = 1.39 × 10⁻⁶), suggesting that the CO₂ was primarily derived from metamorphic carbonate rocks with minor contributions from mantle CO₂ (approximately 3% ∼ 6%) based on the He-CO₂ ternary mixing model calculation. The junction sites of faults in different directions show the strongest gas emission with relatively high δ¹³C_CH4 and δ¹³C_CO2 values, and higher CO₂ content, indicating direct connectivity with underlying fluid reservoirs. Therefore, these geofluids primarily migrate through deep fault systems within the thickened crust. Relatively high stress at fault intersections enhances fluid conductivity, promoting fluid migration upward and thus the potential formation of carbonic springs. These findings offer valuable insights into regional fault activity and crust-fluid interactions.

无印良品碳酸泉是典型的构造控制型碳酸泉。为了了解这些温泉地流体的来源和循环过程，采集了28个水样和14个气样，并对其化学和同位素组成进行了分析。泉水的水化学类型为Ca-HCO3型，主要是碳酸盐矿物的溶蚀作用。δD值在- 106.8‰~ - 89.6‰之间，δ18O值在- 15.1‰~ - 12.6‰之间，表明其主要来源是不同海拔的大气降水。水通过断裂带渗透到5.0±0.7 km深处，与深层流体和浅层地下水混合，然后排放到地表。泉水气体的δ13CCO2值在−5.8‰~−2.9‰之间，3He/4He比值为大气值的0.08 ~ 0.12倍（3He/4He = 1.39 × 10−6），根据He-CO2三元混合模型计算，表明CO2主要来源于变质碳酸盐岩，地幔CO2贡献较小（约3% ~ 6%）。不同方向断裂结合处瓦斯涌出最强，δ13CCH4和δ13CCO2值较高，CO2含量较高，与下伏流体储层有直接连通性。因此，这些地流体主要通过增厚地壳内的深断层系统迁移。断层交叉处相对较高的应力增强了流体的导电性，促进了流体向上运移，从而可能形成碳酸弹簧。这些发现为研究区域断层活动和地壳-流体相互作用提供了有价值的见解。

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引用次数: 0

High-Resolution LiDAR-based fault scarp identification and rupture zone analysis: a case study of the Laohushan Fault, northern Tibetan Plateau, China

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Asian Earth Sciences

Pub Date : 2026-02-15 Epub Date: 2025-11-19 DOI: 10.1016/j.jseaes.2025.106872

Ziyang Zhang, Tao Chen, Aixia Dou, Peng Liang

Fault scarps are key tectonic landforms for studying paleoearthquake events. This study utilized high − resolution LiDAR data and the curvature template matching algorithm to analyze fault scarps and surface rupture zones along the western Laohushan Fault, northern Tibetan Plateau. Optimized through binary classification and evaluation metrics (accuracy, ROC curves, Cohen’s Kappa), the method identified a 500 m template window size and a median Signal-to-Noise Ratio (SNR) threshold of 46 dB as optimal for distinguishing tectonic features. A rupture zone width of 150 m yielded the highest Area Under the Curve (AUC) and Cohen’s Kappa values, validated by field surveys and seismic array reflections. Challenges included false positives from complex topography and human modifications (e.g., river terraces, roads). This work demonstrated the potential of LiDAR and automated algorithms for fault scarp detection, enhancing seismic hazard assessment and fault zone mapping. Future research should focus on adaptive thresholding, advanced scarp degradation models, and multimodal data integration. The findings provided critical insights into the geometry and activity of the Laohushan Fault, supporting seismic risk mitigation and infrastructure planning in this region.

断崖是研究古地震事件的关键构造地貌。通过二元分类和评价指标（精度、ROC曲线、Cohen’s Kappa）进行优化，该方法确定了500 m的模板窗口大小和46 dB的中位信噪比（SNR）阈值是区分构造特征的最佳参数。断裂带宽度为150 m时，曲线下面积（AUC）和Cohen’s Kappa值最高，经现场调查和地震阵反射验证。挑战包括复杂地形和人为改变（如河流梯田、道路）的误报。这项工作展示了激光雷达和自动算法在断层陡坡检测、增强地震危险性评估和断层带测绘方面的潜力。未来的研究应集中在自适应阈值、先进的陡坡退化模型和多模态数据集成等方面。这些发现对老虎山断层的几何形状和活动提供了重要的见解，为该地区的地震风险缓解和基础设施规划提供了支持。

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引用次数: 0

Trace element geochemistry of magnetite and hematite from the Jinchang porphyry Au-Cu deposit, northeast China: Implications for fluid evolution and cobalt enrichment 金昌斑岩型金铜矿磁铁矿和赤铁矿微量元素地球化学特征及其流体演化和钴富集意义

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Asian Earth Sciences

Pub Date : 2026-02-15 Epub Date: 2025-12-12 DOI: 10.1016/j.jseaes.2025.106914

Peng-Fei Shan , Ming-Jian Cao , Noreen J. Evans , Le Wang , Yi Li , Yu-Suo Zhao , Ke-Zhang Qin

The Jinchang porphyry Au-Cu deposit in Northeast China has recently shown significant cobalt (Co) enrichment. Before the precipitation of Co-rich sulfides during the main mineralization stage, magnetite and hematite precipitation occurred. Based on the different morphological characteristics of magnetite, it can be classified into mushketovite Mag1 (aspect ratio > 5) and granular Mag2 (aspect ratio < 2) and further subdivided into four subtypes: Mag1-1, Mag1-2, Mag2-1 and Mag2-2. The platy Mag1 is mushketovite, replacing early hematite. The granular Mag2, with well-defined 120° triple junction textures, formed through fluid-assisted recrystallization processes. Mag1 has a trace element composition very similar to the precursor hematite, indicating that the trace element characteristics of Mag1 were inherited from hematite and do not reflect the trace element composition of the fluid at the time of its formation. Mag2 has higher contents of Ti, V, Al, Mg, Si, Mn, Co and Ni, reflecting the trace element characteristics of the fluid in equilibrium with Mag2 during its formation. The early precipitation of magnetite and hematite can effectively inhibit the premature incorporation of Co into sulfides, thereby promoting pre-enrichment of Co in the fluid. While the precipitation of magnetite and hematite can increase the Co/Fe ratio in the residual fluid, it does not directly cause the high Co enrichment in sulfides within the Jinchang deposit. However, the precipitation of magnetite facilitates the migration of Co from mafic magma into ore-forming fluids under acidic and oxidizing conditions, which may be a contributing factor to the Co enrichment in Jinchang deposit.

东北金昌斑岩型金铜矿床近年来钴（Co）富集显著。主成矿阶段富钴硫化物析出前，有磁铁矿和赤铁矿析出。根据磁铁矿的不同形态特征，可将其划分为mushketovite Mag1（长径比>； 5）和粒状Mag2（长径比<； 2），并进一步细分为Mag1-1、Mag1-2、Mag2-1和Mag2-2 4个亚型。板状Mag1为mushketovite，取代了早期赤铁矿。通过流体辅助再结晶过程形成具有明确的120°三重结织构的粒状Mag2。Mag1的微量元素组成与前驱赤铁矿非常相似，说明Mag1的微量元素特征是继承自赤铁矿，并不能反映其形成时流体的微量元素组成。Mag2具有较高的Ti、V、Al、Mg、Si、Mn、Co和Ni含量，反映了流体在形成过程中与Mag2处于平衡状态的微量元素特征。磁铁矿和赤铁矿的早期沉淀可有效抑制Co过早混入硫化物中，从而促进流体中Co的预富集。磁铁矿和赤铁矿的析出可以提高残余流体中的Co/Fe比，但不能直接导致金场矿床内部硫化物中Co的高富集。而磁铁矿的沉淀使Co在酸性和氧化条件下从基性岩浆中迁移到成矿流体中，这可能是金厂矿床Co富集的一个因素。

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引用次数: 0

Tectonic control on the channel offset orientations in the Ganga foreland basin: A neotectonic perspective 构造对恒河前陆盆地河道偏移方向的控制：新构造视角

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Asian Earth Sciences

Pub Date : 2026-02-15 Epub Date: 2025-12-06 DOI: 10.1016/j.jseaes.2025.106903

Rahul K. Choudhury , Pitambar Pati , Narendra K. Patel , Manoj K. Jaiswal

The current study in the Ganga foreland basin used 2202 channel offset orientations to establish their relationship with the neotectonics. The variation of the offset orientations acknowledge the directions of plate motion, regional stress field, compressional and extensional structures, subsurface basement ridges, and faults in the foreland. 53.52% offsets are aligned along the NE-SW, i.e., parallel to the plate movement direction, while the rest are aligned NW-SE, i.e., parallel to the Himalayan compressional trend, with the highest concentration along the N40°-60°E and N40°-60°W. The NW-SE stress imposed by the Indian plate’s compression develops various parallel faults and joints, followed by the channel offsets. The decreasing compression intensity away from the Himalayas creates fewer offsets parallel to it, and this trend continues up to the Delhi-Sargodha Ridge’s (DSR) influence at the basin’s southern edge. The NE-SW offsets in the central Ganga basin are influenced by the NE-SW trending faults and basement ridges. The variable strike-slip components along the basement faults contribute to the NE-SW offsets. More NW-SE offsets in the eastern part of the basin are correlated with a larger crustal shortening rate than the western part. The Yamuna-Ganga, Ganga-Ghaghara, Ghaghara-Rapti, Rapti-Gandak, and Gandak-Kosi interfluves record 42.67%, 43.66%, 42.31%, 50.17%, and 55.08% of offsets in NW-SE quadrants, respectively. The E-W trending longer offsets generally seen at the basin’s periphery are due to the strike-slip displacement. However, the E-W offsets in the eastern part of the basin are due to the shallow subsurface thrust splays parallel to the Himalayan Frontal Thrust (HFT).

目前对恒河前陆盆地的研究采用2202水道偏移方向来确定其与新构造的关系。偏移方向的变化反映了板块运动方向、区域应力场方向、挤压伸展构造方向、地下基底脊方向和前陆断裂方向。53.52%的偏移沿NE-SW方向排列，即平行于板块运动方向，其余偏移沿N40°-60°E和N40°-60°W方向排列，即平行于喜马拉雅挤压走向。受印度板块挤压作用的北西-东向应力作用，形成了多种平行断裂和节理，随后形成了河道偏移。远离喜马拉雅山脉的压缩强度降低，与之平行的偏移量减少，这一趋势一直持续到盆地南部边缘的德里-萨戈达脊（DSR）的影响。恒河盆地中部的北东-西向偏移受北东-西向断裂和基底隆起的影响。基底断裂的走滑分量变化导致北东向西向偏移。盆地东部北西-东向偏移多，地壳缩短速率大于西部。亚木纳-恒河、恒河-加加拉、加加拉-拉普提、拉普提-甘达克和甘达克-科西断流分别占西北-东南象限偏移量的42.67%、43.66%、42.31%、50.17%和55.08%。在盆地外围普遍出现的东西向较长偏移是由走滑位移引起的。而盆地东部的东西向偏移是由于与喜马拉雅锋面逆冲平行的浅层地下逆冲展布所致。

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