Gondwana Research最新文献_第6页

Porous rock permeability quantification: A superpixel-driven graph neural network method for pore region analysis 多孔岩石渗透率量化：一种用于孔隙区域分析的超像素驱动图神经网络方法

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-12-13 DOI: 10.1016/j.gr.2025.11.014

Xinlin Zhao , Yuan Zhong , Ping Li

Rock permeability, as a significant parameter, plays a crucial role in research related to geological exploration, reservoir resource development, and the movement and distribution of subsurface fluids. Despite significant advancements in artificial intelligence technology for rock analysis in recent years, challenges remain in terms of prediction accuracy, computational complexity, and resource dependency. To address these issues, this paper proposes a superpixel-based graph neural network (SP-GNN) method to achieve rock permeability prediction. Specifically, the flow space of the rock medium is superpixelized to construct graph data. Based on the superpixel graph data, a graph neural network designed to learn multi-level cascading features is developed, while also implementing an algorithm to extract neighborhood spatial features that contain sequential relationships. A temporal pooling strategy is proposed to perform collaborative learning of the cascading features and neighborhood spatial features of graph data from a temporal perspective, in order to obtain hierarchical global features of dynamic nodes. Finally, the global features of the graph are input into the downstream tasks to achieve accurate prediction of permeability. Experimental results show that the SP-GNN significantly outperforms various existing benchmark schemes for permeability prediction across seven comprehensive performance metrics, demonstrating the ability to accurately and efficiently predict permeability for both mixed-type and single-type rocks; ablation experiments further validate the effectiveness of the proposed temporal pooling strategy.

岩石渗透率作为一个重要的参数，在地质勘探、储层资源开发、地下流体运动分布等研究中起着至关重要的作用。尽管近年来人工智能技术在岩石分析方面取得了重大进展，但在预测精度、计算复杂性和资源依赖性方面仍然存在挑战。针对这些问题，本文提出了一种基于超像素的图神经网络（SP-GNN）方法来实现岩石渗透率预测。具体来说，对岩石介质的流动空间进行超像素化处理以构建图形数据。基于超像素图数据，提出了一种学习多层次级联特征的图神经网络，并实现了包含序列关系的邻域空间特征提取算法。提出了一种时间池化策略，从时间角度对图数据的级联特征和邻域空间特征进行协同学习，以获得动态节点的层次化全局特征。最后，将图的全局特征输入到下游任务中，实现对渗透率的准确预测。实验结果表明，SP-GNN在7个综合性能指标上显著优于现有的各种渗透率预测基准方案，能够准确有效地预测混合类型和单一类型岩石的渗透率；消融实验进一步验证了时间池策略的有效性。

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引用次数: 0

Early Cretaceous Meso-Tethyan oceanic plateau built on an ultraslow-spreading oceanic lithosphere: Insights from Hf–Nd–Os isotopes and Pt-group elements of the Dongco ophiolite, central Tibet

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-12-13 DOI: 10.1016/j.gr.2025.11.012

Chen Ji , Kai-Jun Zhang

The Dongco ophiolite in central Tibet represents an ideal profile of a Meso-Tethyan oceanic plateau lithosphere. In this paper, we presented petrological, geochronological, geochemical, Hf–Nd–Os isotopic and Pt-group elemental data for its primary igneous units, in an attempt to constrain the architecture and building process of oceanic plateau. The oceanic plateau basalts erupted over the Middle Jurassic (∼167 Ma) normal mid-oceanic ridge basalt (N-MORB)-like oceanic lithosphere dominantly composed of ultramafic and mafic plutons (ε_Nd(t) = 6.5–9.5; ε_Hf(t) = 15–21), at the Early Cretaceous (∼125 Ma). The absence of MORB-type basalt in the Dongco ophiolite, as well as the presence of diabase dikes intruding the mantle peridotite and cumulate gabbro, indicates the base of the oceanic plateau formed under an ultraslow spreading setting. The plateau basalts have positive ε_Nd(t) values (3.8–5.1), geochemically with distinct ocean-island basalt (OIB) affinity, and represent plume melts that were estimated to form at a depth over 160 km (1600 ℃ potential temperature). Wehrlites at the bottom of the OIBs, isotopically consistent with the OIBs, have highly siderophile element (HSE) compositions similar to Hawaii picrite and tholeiitic basalt with suprachondritic Os isotopic compositions (⁸⁷Os/¹⁸⁸Os = 0.1306–0.1329), signifying the plume melt cumulates based on modeling. The harzburgites are geochemically heterogeneous due to the plume melt–rock interaction. Type 1 harzburgites, mantle residues, have abyssal peridotite-like HSE compositions with subchondritic ¹⁸⁷Os/¹⁸⁸Os ratios (0.1182–0.1204) and ancient Re depletion model ages (1.0–1.3 Ga), indicating a complex depletion history. Type 2 harzburgites are characterized by fractionated Ir-group Pt group element compositions, higher subchondritic ¹⁸⁷Os/¹⁸⁸Os ratios (0.1211–0.1251) and younger Re depletion model ages (0.3–0.9 Ga), likely a percolation effect of plume melts with radiogenic Os isotopic compositions.

本文通过岩石学、年代学、地球化学、Hf-Nd-Os同位素、pt族元素等资料对其原生火成岩单元进行分析，试图对海洋高原的构造和形成过程进行约束。中侏罗统（~ 167 Ma）正常的洋中脊玄武岩（N-MORB）型洋岩石圈(εNd(t) = 6.5-9.5；εHf(t) = 15-21)，早白垩世（~ 125 Ma）。东错蛇绿岩中没有morb型玄武岩，而辉绿岩脉侵入地幔橄榄岩和堆积辉长岩，表明该洋基高原是在超低扩张背景下形成的。高原玄武岩εNd(t)值为正（3.8 ~ 5.1），地球化学上具有明显的洋岛玄武岩（OIB）亲和性，代表在深度160 km（1600℃位温）以上形成的羽流熔体。岩石底部的威氏岩同位素特征与岩石一致，具有与夏威夷冰辉岩和拉斑玄武岩相似的高亲铁元素（HSE）组成，并具有超软粒质Os同位素组成（87Os/188Os = 0.1306-0.1329），表明模拟结果为羽流熔融堆积。由于羽流熔融-岩石相互作用，哈尔茨伯尔土具有地球化学不均匀性。1型哈尔茨伯尔岩为地幔残余物，具有深海橄榄岩样HSE组成，亚球粒状187Os/188Os比值（0.1182 ~ 0.1204），古Re枯竭模式年龄（1.0 ~ 1.3 Ga），具有复杂的枯竭历史。2型哈茨伯尔岩的特征是ir -组Pt -组元素组成分异，亚球粒型187Os/188Os比值较高（0.1211 ~ 0.1251），Re耗尽模型年龄较低（0.3 ~ 0.9 Ga），可能是放射性成因Os同位素组成的羽流熔体的渗透作用。

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引用次数: 0

Mantle eclogite evidence of subducted carbonate sediments in Earth’s deep carbon cycle 地球深部碳循环中俯冲碳酸盐沉积物的地幔榴辉岩证据

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-12-13 DOI: 10.1016/j.gr.2025.11.015

Jing Sun , Ross N. Mitchell , Luc S. Doucet , Kouki Kitajima , Ranpeng Li , Jinglin Su , Qiqi Ou , Tanya Kalashnikova , Sergey I. Kostrovitsky

Mantle eclogite represents a rare and unique archive for understanding the dynamics and implications of subduction, but its origin is still debated especially for high-MgO eclogites. We report new chemical and Mg–O isotopic data on high-MgO mantle eclogites from the Obnazhennaya kimberlite, Siberia craton. Obnazhennaya high-MgO eclogites have lower bulk δ²⁶Mg isotopes (-1.47– -0.36‰) and mantle-like garnet δ¹⁸O isotopes (+5.18–+6.39‰). A bulk mixing calculation among oceanic crust, carbonate sediment and kimberlite, and its effects on Mg isotopes and MgO content indicate that metasomatism can only increase the MgO content but not δ²⁶Mg, and more than 50% dolostone by mass is needed, under conditions with no kimberlitic melt metasomatism, to account for both high-MgO contents, which is unrealistically high for natural settings. The ternary mixing model on both O–Mg isotopic compositions and MgO–Mg isotopic compositions suggest that subducted oceanic crusts modified by mantle metasomatism (e.g., kimberlite-like melt) as well as carbonate sediments involvement collectively provides the best explanation for such a high magnesian origin. This model is also compatible with global mantle eclogite observations, where there is also a clear chemical composition distinction between high- and low-MgO eclogites globally. In light of our new results and global compilation, we propose that mantle eclogites represent a spectrum of metasomatized subducted oceanic crust with variable amounts of the involvement of carbonate sediments, the latter of which represents a novel ingredient in the recipe for making previously enigmatic high-MgO eclogite xenoliths in kimberlites.

地幔榴辉岩是了解俯冲动力学和意义的一个罕见而独特的档案，但其起源仍然存在争议，特别是高镁榴辉岩。本文报道了西伯利亚克拉通Obnazhennaya金伯利岩中高mgo地幔榴辉岩的化学和Mg-O同位素新数据。Obnazhennaya高mgo榴辉岩具有较低的δ26Mg同位素（-1.47 ~ -0.36‰）和幔状石榴石δ18O同位素（+5.18 ~ +6.39‰）。海洋地壳、碳酸盐沉积物和金伯利岩的整体混合计算及其对Mg同位素和MgO含量的影响表明，交代作用只会增加MgO含量，而不会增加δ26Mg，并且在没有金伯利岩熔融交代的条件下，需要超过50%的白云岩质量才能解释这两个高MgO含量，这在自然环境中是不现实的。O-Mg同位素组成和MgO-Mg同位素组成的三重混合模型表明，俯冲洋壳经过地幔交代作用（如金伯利岩类熔体）和碳酸盐沉积物的共同作用，为这种高镁成因提供了最好的解释。该模型也与全球地幔榴辉岩观测相一致，在全球范围内，高、低镁榴辉岩的化学成分也有明显的区别。根据我们的新结果和全球汇编，我们提出地幔榴辉岩代表了交代俯冲海洋地壳的光谱，其中碳酸盐沉积物的参与程度不同，后者代表了金伯利岩中以前神秘的高mgo榴辉岩包体配方的新成分。

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引用次数: 0

Late Paleozoic tectonic evolution of Hegenshan–Nenjiang Ocean: Constraints from Late Devonian–Early Carboniferous igneous rocks in the Xing’an Accretionary Terrane 和根山-嫩江洋晚古生代构造演化：来自兴安增生地体晚泥盆世-早石炭世火成岩的制约

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-12-05 DOI: 10.1016/j.gr.2025.11.007

Tong Zhou , Boran Liu , Qingbin Guan , Yongjiang Liu , Zhiqiang Feng , Yongfei Ma , A.Yu. Peskov , Sanzhong Li , Jiangfeng Wei , Jinzi Li

The Central Asian Orogenic Belt (CAOB) is the largest accretionary orogenic belt in the world, and Northeast (NE) China is situated in the eastern section of the CAOB. Previous studies proposed that the whole of NE China experienced a ca. 60 Ma period of magmatic quiescence throughout the Devonian. In contrast, the Early Carboniferous was marked by a resurgence of intense magmatic activity. However, the driving mechanism for the transformation from the Devonian magmatic quiescence to the Early Carboniferous magmatic flare-up remains debated. To constrain this key issue, we present new zircon U–Pb ages and whole-rock geochemical data for the Late Devonian–Early Carboniferous igneous rocks from the Xing’an Accretionary Terrane (XAT). New zircon U–Pb ages indicate that the igneous rocks were formed in the Late Devonian (366–360 Ma) and Early Carboniferous (339–336 Ma). The Late Devonian granitoids exhibit diverse origins, including partial melting of crustal materials and partial melting of the lower crust with a minor mantle contribution. The Late Devonian monzonites originated from partial melting of a depleted mantle wedge metasomatized by subduction-related fluids and subsequently underwent significant fractional crystallization. The Early Carboniferous granitoids show geochemical characteristics of I-type granites with adakitic affinities, which were formed by partial melting of thickened juvenile crust. Based on an analysis of the spatiotemporal distribution of our new data, integrated with published data from the XAT, we propose that the Late Devonian–Early Carboniferous was a period of magmatic flare-up. According to the petrological assemblage and geochemical analysis of these igneous rocks, we conclude that the Hegenshan–Nenjiang Ocean (HNO) began to subduct beneath the XAT during the Late Devonian (ca. 380 Ma). Subsequently, the subducted slab of the HNO experienced break-off in the latest Devonian–earliest Carboniferous (ca. 360–350 Ma).

中亚造山带是世界上最大的增生造山带，中国东北位于中亚造山带的东段。前人的研究认为整个东北地区在泥盆纪经历了约60 Ma的岩浆静止期。相比之下，早石炭世的特点是岩浆活动的强烈复苏。然而，泥盆纪岩浆静止向早石炭世岩浆爆发转变的驱动机制仍存在争议。为了限制这一关键问题，我们对兴安增生地体（XAT）晚泥盆世-早石炭世火成岩进行了锆石U-Pb年龄和全岩地球化学研究。新锆石U-Pb年龄指示火成岩形成于晚泥盆世（366-360 Ma）和早石炭世（339-336 Ma）。晚泥盆世花岗岩成因多样，既有地壳物质部分熔融，也有下地壳部分熔融，地幔贡献较小。晚泥盆世二长岩起源于俯冲相关流体交代的衰竭地幔楔的部分熔融，随后经历了显著的分离结晶。早石炭世花岗岩的地球化学特征为由增厚的幼壳部分熔融形成的具有埃达质亲缘的i型花岗岩。基于对新数据的时空分布分析，结合XAT已发表的数据，我们提出晚泥盆世-早石炭世是岩浆爆发时期。根据这些火成岩的岩石学组合和地球化学分析，我们认为，晚泥盆世（约380 Ma）和根山-年江洋开始在XAT下俯冲。随后，在泥盆世晚期-石炭世早期（约360 ~ 350 Ma）， HNO俯冲板块经历了断裂。

{"title":"Late Paleozoic tectonic evolution of Hegenshan–Nenjiang Ocean: Constraints from Late Devonian–Early Carboniferous igneous rocks in the Xing’an Accretionary Terrane","authors":"Tong Zhou , Boran Liu , Qingbin Guan , Yongjiang Liu , Zhiqiang Feng , Yongfei Ma , A.Yu. Peskov , Sanzhong Li , Jiangfeng Wei , Jinzi Li","doi":"10.1016/j.gr.2025.11.007","DOIUrl":"10.1016/j.gr.2025.11.007","url":null,"abstract":"<div><div>The Central Asian Orogenic Belt (CAOB) is the largest accretionary orogenic belt in the world, and Northeast (NE) China is situated in the eastern section of the CAOB. Previous studies proposed that the whole of NE China experienced a ca. 60 Ma period of magmatic quiescence throughout the Devonian. In contrast, the Early Carboniferous was marked by a resurgence of intense magmatic activity. However, the driving mechanism for the transformation from the Devonian magmatic quiescence to the Early Carboniferous magmatic flare-up remains debated. To constrain this key issue, we present new zircon U–Pb ages and whole-rock geochemical data for the Late Devonian–Early Carboniferous igneous rocks from the Xing’an Accretionary Terrane (XAT). New zircon U–Pb ages indicate that the igneous rocks were formed in the Late Devonian (366–360 Ma) and Early Carboniferous (339–336 Ma). The Late Devonian granitoids exhibit diverse origins, including partial melting of crustal materials and partial melting of the lower crust with a minor mantle contribution. The Late Devonian monzonites originated from partial melting of a depleted mantle wedge metasomatized by subduction-related fluids and subsequently underwent significant fractional crystallization. The Early Carboniferous granitoids show geochemical characteristics of I-type granites with adakitic affinities, which were formed by partial melting of thickened juvenile crust. Based on an analysis of the spatiotemporal distribution of our new data, integrated with published data from the XAT, we propose that the Late Devonian–Early Carboniferous was a period of magmatic flare-up. According to the petrological assemblage and geochemical analysis of these igneous rocks, we conclude that the Hegenshan–Nenjiang Ocean (HNO) began to subduct beneath the XAT during the Late Devonian (ca. 380 Ma). Subsequently, the subducted slab of the HNO experienced break-off in the latest Devonian–earliest Carboniferous (ca. 360–350 Ma).</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"151 ","pages":"Pages 374-389"},"PeriodicalIF":7.2,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145689422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unravelling environmental drivers of blue carbon and primary productivity: Microphytobenthic biocoenosis in the mangrove sediments along the southwest coast of India 揭示蓝碳和初级生产力的环境驱动因素：印度西南海岸红树林沉积物中的微底栖植物群落

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-12-05 DOI: 10.1016/j.gr.2025.11.008

Niya Benny , Jittu Mathai , Lathika Cicily Thomas , P. Ajayakumar , T. Amaldev , K.B. Padmakumar

The microphytobenthic biocoenosis in the mangrove sediments along the southwest coast of India is intricately shaped by hydrographic and sediment characteristics. From December 2018 to February 2020, sediment and water samples were taken from five stations: KAN, KOL, KOC1, KOC2, and KOC3. During the investigation, 155 MPB species from 71 genera were discovered. The MPB community comprises diatoms, dinoflagellates, cyanobacteria, euglenophytes, charophytes, and chrysophytes. Major benthic diatoms present in the overall study were Navicula erifuga (179 cells cm⁻³), Diploneis suborbicularis (146 cells cm⁻³), Halamphora cymbifera (136 cells cm⁻³), Diploneis smithii (117 cells cm⁻³), Nitzschia sigma (109 cells cm⁻³), Amphora cymbamphora (93 cells cm⁻³), Achnanthes fimbriata (91 cells cm⁻³), Amphora proteus (74 cells cm⁻³), Gyrosigma balticum (71 cells cm⁻³) and Nitzschia lorenziana (71 cells cm⁻³). The C/N ratios indicated terrigenous organic matter in KOL, while the C/S ratios suggested oxidising conditions at all stations except KOC1, which was reducing. Principal component analysis revealed that MPB and diatom diversity were positively correlated to porewater salinity, sediment temperature, C/N ratio, porewater nitrate and phosphate, DO, silt%, and OC content. MPB, diatoms, dinoflagellates, cyanobacteria, and euglenophytes correlated positively with sand% and chlorophyll a. Conversely, rainfall intensity, porewater silicate, sediment pH, and clay% negatively influenced diversity. Seasonal variations in MPB along the southwest coast of India were more pronounced than spatial differences, with nutrient availability and sediment properties shaping community composition, highlighting key environmental drivers of blue carbon and primary productivity in mangrove sediments.

印度西南海岸红树林沉积物中的微底栖植物群落受水文和沉积物特征的复杂影响。2018年12月至2020年2月，在KAN、KOL、KOC1、KOC2和KOC3 5个站点采集了沉积物和水样。调查共发现71属155种。MPB群落包括硅藻、鞭毛藻、蓝藻、裸藻、绿藻和绿藻。在整个研究中，主要的底栖硅藻是Navicula erifuga（179个细胞厘米−3）、Diploneis suborbicularis（146个细胞厘米−3）、Halamphora cymbifera（136个细胞厘米−3）、Diploneis smithii（117个细胞厘米−3）、Nitzschia sigma（109个细胞厘米−3）、Amphora cymbamphora（93个细胞厘米−3）、Achnanthes fimbriata（91个细胞厘米−3）、Amphora proteus（74个细胞厘米−3）、Gyrosigma balticum（71个细胞厘米−3）和Nitzschia lorenziana（71个细胞厘米−3）。C/N表明KOL中存在陆源有机质，而C/S表明除KOC1外，其余站点均处于氧化状态。主成分分析表明，MPB和硅藻多样性与孔隙水盐度、沉积物温度、C/N比、孔隙水硝酸盐和磷酸盐、DO、淤泥%和OC含量呈正相关。MPB、硅藻、鞭毛藻、蓝藻和裸藻与沙%和叶绿素a呈正相关。相反，降雨强度、孔隙水硅酸盐、沉积物pH和粘土%对多样性呈负相关。印度西南海岸MPB的季节变化比空间差异更为明显，养分有效性和沉积物性质决定了群落组成，突出了红树林沉积物中蓝碳和初级生产力的关键环境驱动因素。

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引用次数: 0

Tomographic constraints on the collision boundary between the Yangtze Block and the Sino–Korean Craton and Yellow Sea Basin extension 扬子地块与中朝克拉通及黄海盆地伸展碰撞边界的层析约束

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-12-05 DOI: 10.1016/j.gr.2025.11.006

Yanbing Liu , Tae-Kyung Hong , Junhyung Lee , Seongjun Park , Samuel Celis , Yuxuan Chen , Jeongin Lee , Byeongwoo Kim

The Triassic collision belt between the Yangtze Block and the Sino–Korean Craton, often considered the Dabie–Sulu Orogenic Belt, may extend to the Korean Peninsula. The precise boundary locations, particularly across the Yellow Sea and Korean Peninsula, are poorly constrained. This study uses an improved double-difference tomography method; 3-D P-wave velocity structures at depths up to 55 km are determined based on data from both Chinese and South Korean stations, achieving a resolution of less than 0.5°. A potential collision front, characterized by high-velocity anomalies, is identified. It aligns with the Sulu Orogenic Belt, passing through the northern Yellow Sea, and extends to the western Korean Peninsula, including the Ongjin Basin, Imjingang Belt, and Hongseong area. Significant low-velocity anomalies extend from the crust of the southern Yellow Sea to the mantle beneath the southwestern Korean Peninsula, including the Okcheon Fold Belt and Jeju Island, suggesting the presence of relatively weak and/or hot material, possibly related to basin extension and mantle upwelling.

扬子地块与中朝克拉通之间的三叠纪碰撞带，通常被认为是大别-苏鲁造山带，可能延伸到朝鲜半岛。确切的边界位置，特别是横跨黄海和朝鲜半岛的边界位置，很难确定。本研究采用改进的双差断层成像方法；根据中国和韩国台站的数据，确定了深度达55公里的三维纵波速度结构，实现了小于0.5°的分辨率。确定了以高速异常为特征的潜在碰撞锋。它与苏禄造山带相接，穿过黄海北部，延伸到瓮津盆地、临津江带、洪城地区等朝鲜半岛西部。显著的低速异常从黄海南部的地壳延伸到朝鲜半岛西南部的地幔，包括沃川褶皱带和济州岛，表明存在相对较弱和/或热的物质，可能与盆地伸展和地幔上涌有关。

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引用次数: 0

Editorial Board (IFC) 编辑委员会（IFC）

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-12-05 DOI: 10.1016/S1342-937X(25)00357-0

引用次数: 0

Testing Mesoproterozoic continental suture models for central Australia using Lu–Hf garnet geochronology and mineral equilibria modelling 利用Lu-Hf石榴石年代学和矿物平衡模型测试澳大利亚中部中元古代大陆缝合模型

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-11-27 DOI: 10.1016/j.gr.2025.10.020

Samantha March , Martin Hand , Laura Morrissey , David Kelsey

Contrary to previous assumptions that metamorphic rocks in the southern North Australian Craton dominantly record Paleoproterozoic processes, Lu–Hf garnet geochronology reveals widespread Mesoproterozoic metamorphism across the Warumpi and southern Aileron Provinces, as well as the Casey Inlier (1160–1130 Ma). This phase of metamorphism is coeval with the high- to ultrahigh-temperature Musgrave Orogeny in the Musgrave Province, south of the Amadeus Basin. Magnetotelluric imaging of a conductivity interface beneath the Amadeus Basin has been suggested to represent a concealed suture between the Musgrave and Warumpi Provinces that could feasibly be related to the Musgrave Orogeny. However, mineral equilibria forward modelling shows high thermal gradient metamorphism (80–195 °C kbar⁻¹) occurs on either side of this ‘suture’, inconsistent with suppositions they are discrete pieces of crust. There is no geochronologic, thermobarometric, or structural basis to meaningfully distinguish between the southern NAC and Musgrave Provinces, with the only apparent separation being the illusion created by the overlying Amadeus Basin. Rather than a collisional regime operating during the Musgrave Orogeny, we suggest the intrusion of the Pitjantjatjara Supersuite in the Musgrave Province induced high thermal gradient metamorphism and subsequent ductile northward outflow of hot, weak material away from the orogenic hinterland and toward the Casey Inlier, Warumpi Province, and Aileron Province.

与以往北澳大利亚克拉通南部变质岩主要记录古元古代过程的假设相反，Lu-Hf石榴石年代学揭示了广泛的中元古代变质作用，横跨Warumpi省和南部Aileron省，以及Casey Inlier （1160-1130 Ma）。这一变质期与Amadeus盆地南部马斯格雷夫省的高至超高温马斯格雷夫造山运动同期。Amadeus盆地下方电导率界面的大地电磁成像表明，在Musgrave和Warumpi省之间存在一条隐藏缝合线，可能与Musgrave造山运动有关。然而，矿物平衡正演模拟显示，高热梯度变质作用（80-195°C kbar−1）发生在这条“缝合线”的两侧，这与它们是地壳离散块的假设不一致。没有地质年代学、热气压学或构造基础来区分NAC南部和Musgrave省，唯一明显的分离是由上覆的Amadeus盆地造成的错觉。我们认为，与其说马斯格雷夫造山运动期间的碰撞机制起作用，不如说皮詹加加拉超套岩在马斯格雷夫省的侵入引起了高热梯度变质作用，随后热弱物质从造山内陆向北流出，流向Casey Inlier、Warumpi省和Aileron省。

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引用次数: 0

BRICS cooperation and ecological sustainability: Unveiling the roles of energy transition, technological innovation, and globalization 金砖国家合作与生态可持续性：揭示能源转型、技术创新和全球化的作用

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-11-27 DOI: 10.1016/j.gr.2025.10.024

Jialiang Wu , Xi Xu , Weihao Wang , Jikun Jiang , Yawei Xue , Ling Jiang

Although BRICS cooperation, a prominent example of South-South collaboration among major emerging economies, has been recognized for its contributions to economic growth, its environmental implications remain relatively underexplored. This study employs a staggered Difference-in-Differences (DID) model to investigate the causal impact of BRICS cooperation on the ecological footprint (EF) of member countries, utilizing panel data spanning 1990–2020 from 24 nations. Specifically, this study treats 5 original BRICS members as an experimental group, and uses 5 newly admitted BRICS + members and 14 countries that have applied to join BRICS as a control group. Comprehensive robustness checks, including parallel trend tests, placebo tests, and alternative model specifications, substantiate the findings. A mechanism analysis further explores the impact pathways through three key channels: energy transition, technological innovation, and globalization. Key findings indicate that: (1) BRICS cooperation causally reduces the EF of its member countries. (2) The cooperation facilitates EF reduction by promoting renewable and nuclear energy generation, although persistent structural dependence on fossil fuels constrains ecological gains. (3) Indigenous innovation capacity enhances the EF-reducing effects of BRICS cooperation. However, while cooperation facilitates technology introduction, it can also enable the diffusion of technologies prioritizing traditional growth over ecological sustainability, thereby leading to an increase in EF. (4) BRICS cooperation significantly promotes the globalization of member countries, which contributes to EF reduction. These findings suggest that BRICS should strategically leverage the ecological co-benefits of its cooperation, actively work to overcome fossil fuel dependence, and establish robust green technology screening and assessment mechanisms to foster sustainable resource management and environmental protection.

金砖国家合作是主要新兴经济体之间南南合作的突出范例，其对经济增长的贡献已得到公认，但其对环境的影响仍未得到充分探讨。本研究采用交错差中差（DID）模型，利用1990年至2020年来自24个国家的面板数据，研究金砖国家合作对成员国生态足迹（EF）的因果影响。具体而言，本研究以5个金砖国家原有成员为实验组，以5个新加入金砖国家+和14个已申请加入金砖国家为对照组。综合稳健性检查，包括平行趋势检验、安慰剂检验和替代模型规范，证实了研究结果。机制分析进一步探讨了能源转型、技术创新和全球化三个关键渠道的影响路径。主要研究结果表明：(1)金砖国家合作导致成员国经济增加值下降。(2)尽管对化石燃料的持续结构性依赖限制了生态效益，但合作通过促进可再生能源和核能发电，促进了环境污染的减少。(3)自主创新能力增强了金砖国家合作的减排效果。然而，虽然合作促进了技术的引进，但它也可以使优先考虑传统增长而不是生态可持续性的技术得以传播，从而导致生态资源的增加。(4)金砖合作显著促进了成员国的全球化，有助于减少温室气体排放。这些研究结果表明，金砖国家应战略性地利用合作的生态效益，积极努力克服对化石燃料的依赖，建立健全的绿色技术筛选和评估机制，促进可持续资源管理和环境保护。

{"title":"BRICS cooperation and ecological sustainability: Unveiling the roles of energy transition, technological innovation, and globalization","authors":"Jialiang Wu , Xi Xu , Weihao Wang , Jikun Jiang , Yawei Xue , Ling Jiang","doi":"10.1016/j.gr.2025.10.024","DOIUrl":"10.1016/j.gr.2025.10.024","url":null,"abstract":"<div><div>Although BRICS cooperation, a prominent example of South-South collaboration among major emerging economies, has been recognized for its contributions to economic growth, its environmental implications remain relatively underexplored. This study employs a staggered Difference-in-Differences (DID) model to investigate the causal impact of BRICS cooperation on the ecological footprint (EF) of member countries, utilizing panel data spanning 1990–2020 from 24 nations. Specifically, this study treats 5 original BRICS members as an experimental group, and uses 5 newly admitted BRICS + members and 14 countries that have applied to join BRICS as a control group. Comprehensive robustness checks, including parallel trend tests, placebo tests, and alternative model specifications, substantiate the findings. A mechanism analysis further explores the impact pathways through three key channels: energy transition, technological innovation, and globalization. Key findings indicate that: (1) BRICS cooperation causally reduces the EF of its member countries. (2) The cooperation facilitates EF reduction by promoting renewable and nuclear energy generation, although persistent structural dependence on fossil fuels constrains ecological gains. (3) Indigenous innovation capacity enhances the EF-reducing effects of BRICS cooperation. However, while cooperation facilitates technology introduction, it can also enable the diffusion of technologies prioritizing traditional growth over ecological sustainability, thereby leading to an increase in EF. (4) BRICS cooperation significantly promotes the globalization of member countries, which contributes to EF reduction. These findings suggest that BRICS should strategically leverage the ecological co-benefits of its cooperation, actively work to overcome fossil fuel dependence, and establish robust green technology screening and assessment mechanisms to foster sustainable resource management and environmental protection.</div></div>","PeriodicalId":12761,"journal":{"name":"Gondwana Research","volume":"151 ","pages":"Pages 282-298"},"PeriodicalIF":7.2,"publicationDate":"2025-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145609427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High resolution palynological succession from the Pennsylvanian and Permian of Paraná Basin: palynostratigraphy, paleoclimatic implications and correlation across Gondwana 帕拉纳<s:1>盆地宾夕法尼亚和二叠纪的高分辨率孢粉演替：冈瓦纳的孢粉地层、古气候意义和相关性

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-11-26 DOI: 10.1016/j.gr.2025.10.021

Rafael R. Bender , Paulo A. Souza , Cristina M. Félix , Daiana R. Boardman , Ana Karina Scomazzon

The Paraná Basin contains continuous sedimentary sections related to the geologic evolution of Western Gondwana, which document paleoecological, paleoclimatic and paleogeographic changes from most of the Phanerozoic. Major tectonic, geological and climatic events had a direct impact on the ecosystems, affecting the local paleofloras, which are revealed from palynomorph assemblages recorded across the basin. In this study, the palynological succession of the upper portion of the Itararé Group in the eastern border of Paraná Basin is described in detail, providing insights into the glacial and terminal glacial phases related to the deposits of the Late Paleozoic Ice Age in South America and neighboring regions. Samples were collected from 99 stratigraphic levels of a composite 260 m section of four boreholes, yielding well preserved, abundant and diverse palynomorph assemblages. The stratigraphic distribution of sporomorph guide taxa allowed the identification of the Crucisaccites monoletus Interval Zone (CmZ) and the Vittatina costabilis Interval Zone (VcZ), which represent the glacial and the terminal glacial phases of the basin, respectively. We provide a high resolution analysis of the former zone for the first time in the southern sector of the basin, recognizing the transition between this and the overlying VcZ from a continuous core section, resulting in a new and an improved characterization of both palynozones. Our data indicate that the glacial/terminal glacial transition in Western Gondwana is characterized by slow and gradual changes in the composition of the palynomorph associations, which are mostly defined by the first appearances of species of Vittatina and the subsequent diversification and quantitative increase of this genus. These results also support the idea that several plant groups present in the Paraná Basin took advantage of the climate amelioration that occurred in Gondwana during the Upper Paleozoic to spread southward, gradually colonizing new areas, which were previously under glacial influence.

帕拉南盆地包含与西冈瓦纳地质演化有关的连续沉积剖面，记录了显生宙大部分时期的古生态、古气候和古地理变化。主要的构造、地质和气候事件对生态系统产生了直接的影响，影响了当地的古植物区系。本文详细描述了帕拉纳盆地东缘itarar群上部的孢粉演替，为研究南美及邻近地区晚古生代冰期沉积的冰期和末冰期提供了依据。在4个钻孔的260 m复合剖面的99个地层层位上采集了样品，得到了保存完好、丰富而多样的孢粉形态组合。孢形引导类群的地层分布，鉴定出了分别代表盆地冰期和末冰期的Crucisaccites monoletus区间带（CmZ）和Vittatina costabilis区间带（VcZ）。我们首次在盆地南段对前者进行了高分辨率分析，并从连续的岩心剖面中识别出其与上覆VcZ之间的过渡，从而对这两个孢粉带进行了新的和改进的表征。我们的数据表明，西冈瓦纳冰期/末冰期转变的特征是发育型组合的组成缓慢而渐进的变化，主要是由Vittatina种的首次出现和该属随后的多样化和数量增加所决定的。这些结果也支持了这样一种观点，即在帕拉纳盆地存在的一些植物群利用上古生代冈瓦纳地区发生的气候改善向南扩散，逐渐占领了以前受冰川影响的新地区。

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引用次数: 0