Gondwana Research最新文献_第7页

Enrichment and efficient extraction of metals in potassic magmas control the formation of post-collisional porphyry deposits 钾质岩浆中金属的富集和有效萃取控制了碰撞后斑岩矿床的形成

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-11-24 DOI: 10.1016/j.gr.2025.10.026

Xiaoyan Zhao , Yuanchuan Zheng , Zengqian Hou , Zhusen Yang , Zixuan Wang , Liangliang Huang , Siqi Liu

Porphyry deposits are the largest source of metals (e.g., Cu, Mo, and Au) worldwide, yet it remains unclear whether the ore-forming magmas are anomalously enriched in metals. Numerous studies have suggested that the magmas responsible for ore formation are enriched in metals. However, recent research on melt inclusion (MI) has put forward the proposition that these magmas may not actually be particularly enriched in metals. In this study, we report the metal contents of MIs in quartz and feldspar phenocrysts from four fertile and three barren Miocene post-collisional porphyries in Tibet. Three main types of isolated MIs were identified: glassy, crystalline, and melt–fluid inclusions. TIMA scanning reveals that the crystalline minerals are primarily quartz, orthoclase and albite, occupying >70 %–90 % of the MIs with minimal fluid modification. By comparing the compositions of MIs and whole-rock samples, it is evident that fertile and barren porphyritic magmas have undergone different magmatic evolution processes. The fertile porphyries exhibit anomalously high metal contents (highest Cu contents of 236–1333 ppm), whereas the barren porphyries have highest Cu contents of <100 ppm. Petrographic observations and modeling suggest that the high Cu concentrations cannot be attributed to magmatic evolution. Notebly, the Cu and Cu/Mo values in the Jiama, Bangpu and Zhunuo porphyries follow coherent trends with a distinct “down-up-down” pattern, which is not observed in barren porphyries. These findings indicate that metals were efficiently extracted from the melts into the exsolved fluids during ore formation. We propose that the initial metal enrichment in the melts and the efficiency of metal extraction are key controlling factors in porphyry mineralization.

斑岩矿床是世界上最大的金属（如铜、钼和金）来源，但目前尚不清楚成矿岩浆是否异常富集金属。许多研究表明，负责成矿的岩浆富含金属。然而，最近关于熔体包裹体（MI）的研究提出，这些岩浆实际上可能并不特别富含金属。分离的MIs主要有三种类型：玻璃状、结晶状和熔融流体包裹体。TIMA扫描显示，晶体矿物主要为石英、正长石和钠长石，占矿体的70% ~ 90%，流体蚀变较小。通过与全岩样品的成分对比，可以看出富斑岩和贫斑岩岩浆经历了不同的岩浆演化过程。肥沃斑岩的金属含量异常高（Cu含量最高为236-1333 ppm），而贫瘠斑岩的Cu含量最高为100 ppm。岩石学观察和模拟表明，高铜浓度不能归因于岩浆演化。值得注意的是，甲玛、邦铺和准诺斑岩的Cu值和Cu/Mo值具有明显的“下—上—下”规律，在贫斑岩中没有这种特征。这些发现表明，在成矿过程中，金属被有效地从熔体中提取到溶解的流体中。认为熔体中金属的初始富集和金属萃取效率是斑岩成矿的关键控制因素。

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引用次数: 0

The 2008 Mw 7.9 Wenchuan, China earthquake: not a case of reservoir triggered seismicity 2008年中国汶川7.9级地震：不是水库引发的地震活动

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-11-24 DOI: 10.1016/j.gr.2025.11.005

Harsh K. Gupta, Rajesh Rekapalli

Western Sichuan region, China, experienced a devastating Mw 7.9 earthquake on the 12^th May 2008, claiming about 70,000 human lives. It is debated whether it was triggered by the nearby Zipingpu Reservoir or not. The region has a history of major earthquakes exceeding magnitude 7 occurring within a 300 km radius of the epicenter of the Wenchuan earthquake. It has been established that reservoir-triggered earthquake sequences fall in Type 2 of Mogi’s classification of earthquake sequences. That is not found to be the case with the 2008 Mw 7.9 Wenchuan earthquake sequence. In addition, the tectonic nature of this earthquake was also confirmed from the observed foreshock and aftershock ‘b’ value of 0.47 and 1.15. All these characteristics belong to Type 1 of Mogi’s models whereas artificial water reservoir-triggered earthquake sequences belong to Type 2 of Mogi’s models with a high aftershock ‘b’ value. Moreover, RTS does not occur in a thrust fault environment, which is prevalent in the Sichuan region of China. With these considerations, we find the 2008 Mw 7.9 Wenchuan earthquake is not a case of Reservoir Triggered Seismicity.

2008年5月12日，中国四川西部地区发生了里氏7.9级大地震，造成约7万人死亡。是否由附近的紫坪铺水库引发至今尚有争议。历史上，该地区在汶川地震震中300公里范围内发生过7级以上的大地震。确定了储层触发地震序列属于Mogi地震序列分类中的第2类。但在2008年汶川7.9级地震序列中却没有发现这种情况。此外，观测到的前震和余震‘ b ’值分别为0.47和1.15，也证实了此次地震的构造性质。这些特征都属于Mogi模型的第一类，而人工水库触发地震序列则属于Mogi模型的第二类，余震“b”值较高。此外，RTS并不发生在中国四川地区普遍存在的逆冲断层环境中。考虑到这些因素，我们发现2008年汶川7.9级地震不是水库引发地震活动的一个例子。

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引用次数: 0

Metagenomics insights into the effect of microplastics and/or cadmium on carbon, nitrogen, and phosphorus cycles in freshwater sediments 微塑料和/或镉对淡水沉积物中碳、氮和磷循环的影响的宏基因组学见解

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-11-23 DOI: 10.1016/j.gr.2025.10.023

Xiao Ma , Xueli Wang , Zhanfeng Cui , Yingyuan Zhang , Shaoqi Zhou

The accumulations of microplastics (MPs) and cadmium (Cd) are ubiquitous in sediments. However, the impact of MPs and Cd on element cycles in sediments, particularly on greenhouse gas (GHG) emissions, has not been systematically reported. Herein, a microcosm experiment was conducted to investigate the responses of sedimentary carbon, nitrogen and phosphorus transformation processes, GHG emissions and microbial communities to MPs, Cd and MPs + Cd. The results indicate 1 %w/w of polyethylene (PE) or polystyrene (PS) MPs stimulated N₂O, CO₂ and CH₄ emissions primarily through the regulation of genes associated with denitrification (nosZ and norBC), organic carbon degradation and methanogenesis (mtrA, mttB and pmoABC), respectively. Both 1 %w/w of PE MPs and PS MPs significantly inhibited the ALP activity and the expression of organic phosphate mineralizing genes (phoD, phoN and phnX), ultimately reducing the Bio-P content. Additionally, 8 mg kg⁻¹ of Cd inhibited the CO₂ and CH₄ emissions primarily through the regulation of genes associated organic carbon degradation and methanogenesis (mttB and pmoABC), but it stimulated N₂O emissions primarily through the down-regulation of gene nosZ and hence had no significant effect on global warming potential (GWP). Notably, the coexistence of MPs and Cd could impact microbial communities in MPs biofilms and promote the expression of gene nosZ, which may ultimately antagonize N₂O emissions. These findings provide a scientific basis for the ecological management of watersheds polluted by MPs and/or Cd, in particular, illustrate the need for a closer integration of microbial C-N-P interactions.

微塑料（MPs）和镉（Cd）的积累在沉积物中无处不在。然而，MPs和Cd对沉积物中元素循环的影响，特别是对温室气体（GHG）排放的影响，尚未有系统的报道。通过微观实验研究了沉积碳、氮、磷转化过程、温室气体排放和微生物群落对MPs、Cd和MPs + Cd的响应。结果表明，1 %w/w的聚乙烯（PE）或聚苯乙烯（PS） MPs主要通过调控与反硝化（nosZ和norBC）、有机碳降解和甲烷生成（mtrA、mttB和pmoABC）相关的基因来刺激N2O、CO2和CH4的排放。1 %w/w的PE MPs和PS MPs均能显著抑制ALP活性和有机磷酸盐矿化基因phoD、phoN和phnX的表达，最终降低Bio-P含量。此外，8 mg kg - 1 Cd主要通过调控有机碳降解和甲烷生成相关基因（mttB和pmoABC）抑制CO2和CH4排放，但主要通过下调nosZ基因刺激N2O排放，因此对全球变暖潜势（GWP）没有显著影响。值得注意的是，MPs和Cd的共存会影响MPs生物膜中的微生物群落，促进nosZ基因的表达，最终可能拮抗N2O排放。这些发现为MPs和/或Cd污染的流域生态管理提供了科学依据，特别是说明了更紧密地整合微生物C-N-P相互作用的必要性。

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引用次数: 0

Global governance priorities derived from SDG spatiotemporal dynamics and causal interactions 从可持续发展目标的时空动态和因果相互作用衍生的全球治理优先事项

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-11-23 DOI: 10.1016/j.gr.2025.10.027

Yizhong Huan , Linjiang Ji , Yiming Su , Feng Kong , Yang Lan , Zhaohui Feng , Siyu Wang , Tao Liang , Mingyuan Wang , Pengpeng Mo , Jian Hu , Lingqing Wang , Guangjin Zhou , Xiaoyun Li , Yazhu Wang

High-precision assessments of the spatiotemporal dynamics of global Sustainable Development Goal (SDG) performance are needed to guide effective cross-scale governance for sustainable development. However, related studies remain limited, and the contributions and causal interactions of individual goals are unclear, hindering the identification of transformative action priorities. Here, the SDG Index, multiple spatiotemporal analysis models, and a grey forecast model were integrated to develop a new framework for assessing spatiotemporal patterns in global SDG performance from 2000 to 2030. In addition, machine learning was applied to identify the key goals contributing to SDG acceleration and to map their weighted causal interactions across the SDG system. The results showed that global SDG progress stalled after 2020 and is unlikely to be fully achieved by 2030. SDG 2 (zero hunger) significantly lagged behind, while SDG 4 (quality education) was the most influential driver, with particularly strong effects on SDGs 6 (clean water and sanitation) and 17 (partnerships for the goals). Despite strong spatial autocorrelation in SDG performance, notable disparities persist across regions. The spatial center of SDG performance shifted eastward over time, indicating that Asia has become as a key driver of global SDG acceleration, although environmental sustainability challenges persist. Although the Global North–South gap has slightly narrowed, development inequalities remain pronounced, with SDG 1 (no poverty) showing the largest disparity and SDG 2 representing a shared deficiency. This study enhances the understanding of global sustainable development progress and provides new insights applicable for broader global cooperative governance, facilitating the acceleration of the 2030 Agenda.

需要对全球可持续发展目标（SDG）绩效的时空动态进行高精度评估，以指导可持续发展的有效跨尺度治理。然而，相关研究仍然有限，个别目标的贡献和因果关系尚不清楚，阻碍了确定变革行动的优先事项。本文将可持续发展目标指数、多种时空分析模型和灰色预测模型相结合，构建了2000 - 2030年全球可持续发展目标绩效时空格局评估的新框架。此外，还应用机器学习来确定有助于加速可持续发展目标的关键目标，并在整个可持续发展目标系统中绘制它们的加权因果关系图。结果显示，全球可持续发展目标的进展在2020年之后停滞不前，到2030年不太可能完全实现。可持续发展目标2（零饥饿）明显落后，而可持续发展目标4（优质教育）是最具影响力的驱动因素，对可持续发展目标6（清洁水和卫生设施）和17（目标伙伴关系）的影响尤其强烈。尽管可持续发展目标的表现具有很强的空间自相关性，但区域间仍存在显著差异。随着时间的推移，可持续发展目标绩效的空间中心向东转移，表明亚洲已成为全球加速可持续发展目标的关键驱动力，尽管环境可持续性挑战依然存在。尽管全球南北差距略有缩小，但发展不平等现象仍然明显，可持续发展目标1（无贫困）显示出最大的差距，而可持续发展目标2代表着共同的不足。该研究增进了对全球可持续发展进展的认识，为更广泛的全球合作治理提供了新的见解，有助于加快落实2030年可持续发展议程。

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引用次数: 0

First high-intensity glossopterid herbivory index assessment from Indian Gondwana: Insights into global Permian plant–insect interactions 首次来自印度冈瓦纳的高强度舌蕨食草指数评估：对全球二叠纪植物-昆虫相互作用的见解

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-11-23 DOI: 10.1016/j.gr.2025.10.022

Paresh Ranjan Dash , Shreerup Goswami , Sanghamitra Pradhan , Duryadhan Behera

The Permian sediments of the East Bokaro Coalfield, Jharkhand, within the Damodar Basin, are renowned for their abundant Lower Gondwana plant fossil record. The megafloral assemblages, recovered from the Barakar Formation (late Artinskian–Kungurian; late Early Permian), particularly from the Open Cast Projects of Kathara, Karo, and Khasmahal, reveal diverse insect-mediated damage. The flora is dominated by Glossopteridales (Glossopteris, Gangamopteris), followed by Cordaitales (Noeggerathiopsis, Euryphyllum) and Equisetales (Schizoneura). Of 974 examined specimens, 89 (9.13%) exhibit traces of insect activity. These traces offer critical insights into early insect behaviour and ecological interactions. Documented feeding types include galling, blotching, midrib feeding, hole feeding, margin feeding, surface abrasion, and complete surface obliteration—primarily affecting glossopterid leaves, scale leaves, and stems. Margin feeding emerges as the most prevalent damage type, accounting for 28.09% of recorded instances. Additionally, the presence of egg sacs along leaf midribs and laminae suggests oviposition behaviour.

This investigation represents the first quantitative Herbivory Index (HI) study from Indian Gondwana, providing a benchmark dataset for understanding Permian plant–insect dynamics in the Southern Hemisphere. The HI was applied to quantify feeding intensity, revealing a peak value of 31.97% for surface feeding, indicating significant insect activity. Comparative analysis with contemporaneous Permian floras from Gondwana and Laurasia demonstrates that the East Bokaro assemblage exhibits relatively diverse herbivory levels in a global context, highlighting its ecological distinctiveness.

These findings substantially contribute to our understanding of insect feeding strategies, plant–insect coevolution, and their evolutionary implications during the late Early Permian, offering a critical reference point for global deep-time herbivory studies.

位于达摩达尔盆地的贾坎德邦东Bokaro煤田的二叠纪沉积物以其丰富的下冈瓦纳植物化石记录而闻名。从Barakar组（Artinskian-Kungurian晚期，早二叠世晚期），特别是从Kathara、Karo和Khasmahal的露天项目中恢复的巨型植物组合显示了多种昆虫引起的损害。植物区系以舌翅目（舌翅目，Gangamopteris）为主，其次为Cordaitales （Noeggerathiopsis, Euryphyllum）和Equisetales （Schizoneura）。在974个标本中，89个（9.13%）有昆虫活动的痕迹。这些痕迹为早期昆虫的行为和生态相互作用提供了重要的见解。记录的进料类型包括磨损、斑点、中脉进料、孔洞进料、边缘进料、表面磨损和完全表面湮没——主要影响舌状叶、鳞片叶和茎。边缘取食是最常见的伤害类型，占记录实例的28.09%。此外，沿叶中脉和叶层的卵囊的存在表明了产卵行为。本研究首次对印度冈瓦纳地区的草食指数（herbiory Index， HI）进行了定量研究，为了解南半球二叠纪植物-昆虫动态提供了一个基准数据集。利用HI量化取食强度，发现地表取食的峰值为31.97%，表明昆虫活动显著。与同时期的Gondwana和Laurasia的植物区系对比分析表明，东Bokaro组合在全球范围内表现出相对多样化的草食水平，突出了其生态独特性。这些发现有助于我们对早二叠世晚期昆虫取食策略、植物-昆虫共同进化及其进化意义的理解，为全球深时间食草动物研究提供了重要的参考点。

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引用次数: 0

Early evolution of the Meso-Tethys Ocean: Constraints from Permo-Triassic flysch deposits 中特提斯海洋的早期演化：来自二叠纪-三叠纪复理石沉积的制约

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-11-23 DOI: 10.1016/j.gr.2025.10.025

Si-Lin Sun , Jian-Jun Fan , Bo-Chuan Zhang , Jia-Wei Bai , Xin-Yu Hou , Yang Wang , Li-Qiang Zhang

Reconstructing the early evolution of the Meso-Tethys Ocean is crucial for understanding the nature of this ocean and the tectonic dynamics of the broader Tethys domain. However, limited sedimentary data—especially the lack of early semi-abyssal to deep-ocean basin sediments—has left the early tectonic evolution of the Meso-Tethys Ocean poorly understood. This study takes the Mugagangri Group in the Gerze area, the middle section of the Bangong–Nujiang suture zone, as the research object, and conducts systematic studies on its petrology, petrography, detrital zircon U-Pb geochronology, and monazite U-Pb geochronology. The results confirm the presence of Middle Triassic flysch deposits, sourced from the South Qiangtang terrane on the northern margin of the Meso-Tethys Ocean. Building on these results, we conduct a comprehensive statistical analysis of relevant studies on Mugagangri Group in the Gerze area. Given the notable differences in detrital zircon characteristics and the newly identified features of Middle Triassic flysch, we propose the existence of Permian-Triassic flysch in the middle section of the Bangong–Nujiang suture zone. We further classify the flysch depositional ages in the Gerze area into four groups: Permian–Early Triassic, Middle Triassic, Late Triassic–Early Jurassic, and Middle Jurassic–Early Cretaceous. This study establishes the existence of continuous semi-deep to abyssal marine sediments in the Meso-Tethys Ocean from the Permian to the Cretaceous period and confirms, from a sedimentological perspective, that the Meso-Tethys Ocean underwent tectonic evolution for at least approximately 160 Ma. Our findings offer a novel sedimentary perspective on the early tectonic evolution of the Meso-Tethys Ocean and serve as a valuable reference for advancing future research on the broader tectonic evolution of the Tethys domain.

重建中特提斯洋的早期演化对于了解该洋的性质和更广泛的特提斯域的构造动力学至关重要。然而，有限的沉积资料，特别是缺乏早期半深海到深海盆地的沉积，使得人们对中特提斯洋的早期构造演化知之甚少。本研究以班公-怒江缝合带中段格则地区穆加格日群为研究对象，对其岩石学、岩石学、碎屑锆石U-Pb年代学、单氮石U-Pb年代学进行了系统研究。结果证实了中三叠世复理石质沉积的存在，这些复理石质沉积来自中特提斯洋北缘的南羌塘地体。在此基础上，对格则地区Mugagangri群的相关研究进行了综合统计分析。考虑到碎屑锆石特征的显著差异和新近发现的中三叠统复理石质特征，我们认为班公-怒江缝合带中段存在二叠系-三叠系复理石质。进一步将格则地区的复理石沉积时代划分为四组：二叠世—早三叠世、中三叠世、晚三叠世—早侏罗世和中侏罗世—早白垩世。本研究确定了二叠纪至白垩纪中特提斯洋存在连续的半深至深海海洋沉积物，并从沉积学角度证实了中特提斯洋至少经历了大约160 Ma的构造演化。研究结果为中特提斯洋早期构造演化提供了新的沉积视角，为进一步深入研究特提斯域的构造演化提供了有价值的参考。

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引用次数: 0

International Association for Gondwana Research (IAGR) 2025 annual convention and 22nd international conference on Gondwana to Asia: A report 国际冈瓦纳研究协会（IAGR） 2025年年会暨第22届冈瓦纳到亚洲国际会议报告

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-11-21 DOI: 10.1016/j.gr.2025.11.004

Sanghoon Kwon , Yirang Jang

引用次数: 0

International Association for Gondwana Research 2026 Convention, the 23rd International Conference on Gondwana to Asia and International Conference on Tectonics of South East Asia (ICTSEA2026), Chiang Mai University, Thailand 国际冈瓦纳研究协会2026年会，第23届冈瓦纳至亚洲国际会议暨东南亚构造国际会议（ICTSEA2026），泰国清迈大学

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-11-21 DOI: 10.1016/j.gr.2025.11.003

Weerapan Srichan

引用次数: 0

Multiple P-T-t paths revealed by granular zircon open new horizons in impact research 粒状锆石揭示的多重P-T-t路径为撞击研究开辟了新的视野

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-11-20 DOI: 10.1016/j.gr.2025.10.017

Elizaveta Kovaleva , Matthew S. Huber , Anja Schreiber , Vladimir Roddatis , Nicolai Klitscher , Christian Schmidt , Richard Wirth

Extreme conditions of hypervelocity impacts are recorded in mineral grains that can be used to reconstruct the peak P-T conditions and the post-impact history of the target. Shock-metamorphosed zircons with granular textures can preserve shock metamorphic conditions and ages of impact events, but the mechanisms creating a variety of granular textures have not been fully explored. We demonstrate through detailed TEM analysis of granular zircon aggregates from two complex peak-ring impact structures (Kara, Russia; Araguainha, Brazil) that there are at least five discernible textural types of granular zircon neoblasts: (I) granular zircon reverted from reidite; (II) incongruent melting/dissociation and new crystallization of zircon; (III) solid-state recrystallization of zircon by grain boundary migration; (IV) shearing of zircon under elevated differential stress; (V) recrystallization of zircon with formation of radiating lamellae. Each type shows a unique P-T-t-cooling path related to shock metamorphic conditions. Therefore, granular zircon is a clear indicator of the impact process, which granule types record a wider variety of extreme conditions than any other mineral phase.

超高速撞击的极端条件记录在矿物颗粒中，可用于重建峰值P-T条件和目标撞击后的历史。具有颗粒状结构的冲击变质锆石可以保存冲击变质条件和冲击事件的年代，但形成各种颗粒状结构的机制尚未得到充分探讨。通过对两个复杂峰环撞击构造（俄罗斯卡拉和巴西阿拉瓜尼亚）的粒状锆石聚集体进行详细的透射电镜分析，我们发现，粒状锆石新母细胞至少有五种可识别的结构类型：(1)由reidite还原的粒状锆石；（II）锆石的不一致熔融/解离和新结晶；（III）晶界迁移作用下的锆石固相再结晶；(4)差应力升高下的锆石剪切作用；(5)锆石再结晶，形成辐射状片层。每种类型都显示出与冲击变质条件相关的独特的p -t- t冷却路径。因此，粒状锆石是一个明确的冲击过程指标，其颗粒类型比任何其他矿物相记录的极端条件更广泛。

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引用次数: 0

Cabeço de Vide Ophiolite: structure, age and correlation of an obducted marginal basin on the northern margin of Gondwana cabeo de Vide蛇绿岩：冈瓦纳北缘断陷边缘盆地的构造、年龄与对比

IF 7.2 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research

Pub Date : 2025-11-19 DOI: 10.1016/j.gr.2025.10.019

Diana Moreno-Martín , Rubén Díez Fernández , Richard Albert , Esther Rojo-Pérez , Manuel Francisco Pereira , Axel Gerdes , Ricardo Arenas

The Cabeço de Vide Ophiolite (SW Iberian Massif) offers new insights into the tectonic evolution of the North Africa Gondwana margin. This study presents petrological, structural, and geochronological evidence to reconstruct the Cadomian tectonic evolution of the Cabeço de Vide Ophiolite and discusses possible correlations. The Cabeço de Vide Massif experienced two Cadomian deformation phases (D_C1 and D_C2). Besteiros thrust (Besteiros Shear Zone) is attributed to D_C1, which obducted the Cabeço de Vide Ophiolite onto the Ediacaran series deposited along the Gondwana margin (top-to-E-NE emplacement). D_C2 produced a normal-sense ductile shear zone with top-to-the-SE kinematics (Cabeço de Vide Shear Zone). A cross-sectional data analysis combining geochronological evidence with U-Pb dating in calcite (marbles) and zircon (amphibolites, metagranites and metaconglomerates) constrains the age of D_C1 between ca. 623–523 Ma. The same analysis suggests a Cambrian age for D_C2, between ca. 523–512 Ma. The sequence, timing and kinematics of the major Cadomian structures in the study area align with those described in other sections of the Cadomian Orogen in Iberia, notably the Calzadilla Ophiolite. We propose a correlation between the Cabeço de Vide and Calzadilla ophiolites, which would emerge as two pieces of a single ophiolitic belt. This ophiolitic belt was probably obducted from a primary fore-arc basin setting inland onto Gondwana during the Cadomian Orogeny. The thrusting of the late Ediacaran ophiolites was followed by the collapse of the arc system, which was accommodated by the development of ductile extensional shear zones during the Cambrian (D_C2), accompanied by uplifting, erosion and magmatism.

cabeo de Vide蛇绿岩（西南伊比利亚地块）为研究北非冈瓦纳边缘的构造演化提供了新的视角。本文通过岩石学、构造学和年代学的证据，重建了cabeo de Vide蛇绿岩的卡多米期构造演化，并讨论了可能的相关性。cabeo de Vide地块经历了两个Cadomian变形阶段（DC1和DC2）。Besteiros逆冲（Besteiros剪切带）是DC1构造的产物，它将cabeo de Vide蛇绿岩逆冲到沿Gondwana边缘沉积的埃迪卡拉系（顶-东东位位）上。DC2产生了一个正常意义上的韧性剪切带，具有顶部到se的运动学（cabeo de Vide剪切带）。结合方解石（大理岩）和锆石（角闪岩、变长岩和变质砾岩）的地质年代学证据和U-Pb定年的横断面数据分析表明，DC1的年龄在623-523 Ma之间。同样的分析表明，DC2的寒武纪年龄在523-512 Ma之间。研究区主要卡多米亚造山带的序列、时间和运动学与伊比利亚卡多米亚造山带其他剖面的描述一致，特别是Calzadilla蛇绿岩。我们提出了cabeo de Vide和Calzadilla蛇绿岩之间的相关性，它们将作为单个蛇绿岩带的两个片段出现。这条蛇绿岩带可能是在卡多米亚造山运动时期从内陆冈瓦纳的原始弧前盆地中隆起而来的。晚埃迪卡拉世蛇绿岩逆冲后，弧系崩塌，寒武纪（DC2）韧性伸展剪切带发育，并伴有隆升、侵蚀和岩浆作用。

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引用次数: 0