Global and Planetary Change最新文献_第10页

Enhanced and southward North Pacific subtropical gyre circulation following the intensification of Northern Hemisphere Glaciation 北半球冰期增强后北太平洋副热带环流向南增强

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-06-23 DOI: 10.1016/j.gloplacha.2025.104953

Luyao Tang , Fengming Chang , Jia Wang , Fang Qian , Junru Zhang , Tiegang Li

{"title":"Enhanced and southward North Pacific subtropical gyre circulation following the intensification of Northern Hemisphere Glaciation","authors":"Luyao Tang , Fengming Chang , Jia Wang , Fang Qian , Junru Zhang , Tiegang Li","doi":"10.1016/j.gloplacha.2025.104953","DOIUrl":"10.1016/j.gloplacha.2025.104953","url":null,"abstract":"<div><div>The North Pacific Subtropical Gyre (NPSG) is critical for ocean heat distribution and climate regulation in the North Pacific and beyond. However, its variations across major climate transitions over long timescales remain poorly constrained. In this study, we reconstruct sea surface temperature (SST) and salinity (SSS) in the mid-latitude Northwest Pacific from 3.8 to 1.8 Ma using planktonic foraminiferal δ<sup>18</sup>O and Mg/Ca ratios from Deep Sea Drilling Project Site 296 and integrate paleorecords from the Kuroshio Current Extension (KCE), California Current (CC), and Alaska Current (AC) regions to investigate NPSG variability during the Late Pliocene Northern Hemisphere Glaciation (NHG). Pronounced increases in SST and SSS at Site 296 after the intensification of the NHG (iNHG) at 2.7 Ma reveal a strengthened Kuroshio Current with enhanced transport of warm saline waters. The concurrent SST increases in the CC and AC areas after ∼2.7 Ma indicate the intensification of all three NPSG boundary currents following the iNHG, resulting in a more robust NPSG circulation. Meanwhile, SSTs in the KCE and northern CC regions decreased considerably, implying southward displacement of the northern boundary of the NPSG. The post-iNHG enhancement and southward shift of the NPSG may have resulted from a more La Niña-like state in the equatorial Pacific and atmospheric circulation reorganization associated with high-latitude cooling in the Northern Hemisphere, as suggested by zonal and meridional SST gradients in the North Pacific. These findings highlight a possible weakening and poleward shift of the NPSG circulation in response to future warming.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104953"},"PeriodicalIF":4.0,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515791","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

Insights into Quaternary iron fertilization dynamics in the western equatorial Pacific: Proxy archives offshore of northern Papua New Guinea 西赤道太平洋第四纪铁施肥动态的洞察：巴布亚新几内亚北部近海的代理档案

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-06-22 DOI: 10.1016/j.gloplacha.2025.104952

Zhaokai Xu , Qingchao Fan , Haowen Dang , Shiming Wan , Christophe Colin , Jiawang Wu , Dhongil Lim , Tiegang Li

{"title":"Insights into Quaternary iron fertilization dynamics in the western equatorial Pacific: Proxy archives offshore of northern Papua New Guinea","authors":"Zhaokai Xu , Qingchao Fan , Haowen Dang , Shiming Wan , Christophe Colin , Jiawang Wu , Dhongil Lim , Tiegang Li","doi":"10.1016/j.gloplacha.2025.104952","DOIUrl":"10.1016/j.gloplacha.2025.104952","url":null,"abstract":"<div><div>The equatorial Pacific is a key oceanographic region for unraveling Earth's climate system dynamics, where nutrient availability (e.g., iron, nitrogen, and phosphorus) plays a crucial role, at least partially, in governing the biologic pump and sea-air carbon exchange. Despite this, provenance, routing, and depositional processes, together with fertilization effects of nutrient supply to the western equatorial Pacific during the Quaternary, with Papua New Guinea potentially acting as a major iron contributor, remain elusive. Here, we present a comprehensive analysis of proxy archives for island erosion and weathering, terrestrial matter supply, surface ocean productivity, downward export of biogenic material, and bottom-water redox, all closely linked to orbital variations of iron fertilization, along the continental slope offshore of northern Papua New Guinea since 275 kyr. Our findings reveal a prominent precession cycle across these integrated records, aligning with changes in January–March insolation at 5°S. The observed temporal coupling indicates that heightened precipitation and erosion in northern Papua New Guinea stimulated nutrient input, thereby enhancing surface ocean fertilization, biologic production, and particulate carbon burial in the western equatorial Pacific during periods of high January–March insolation at 5°S. This caused the area to be a significant atmospheric CO<sub>2</sub> sink during La Niña-like conditions. We propose that enhanced erosion in northern Papua New Guinea led to increased iron fertilization in the western equatorial Pacific. Ongoing iron fertilization may significantly mitigate anthropogenic global warming by enhancing atmospheric CO<sub>2</sub> sequestration associated with increased occurrences of future consecutive La Niña events, as predicted by model simulations.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104952"},"PeriodicalIF":4.0,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144480447","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

Millennial-scale East Asian summer monsoon hydroclimate variability during 47–39 kyr B.P. inferred from a stalagmite IRMsoft-flux record in Southeastern China 基于中国东南部石笋irmsoft通量记录的47 - 39kyr B.P.千禧年东亚夏季风水文气候变率

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-06-22 DOI: 10.1016/j.gloplacha.2025.104954

Yue Li , Wanyin Qiu , Kui Gao , Wenyu Dong , Xiuyang Jiang , Hai Cheng , Chuan-Chou Shen , Yu-Min Chou

{"title":"Millennial-scale East Asian summer monsoon hydroclimate variability during 47–39 kyr B.P. inferred from a stalagmite IRMsoft-flux record in Southeastern China","authors":"Yue Li , Wanyin Qiu , Kui Gao , Wenyu Dong , Xiuyang Jiang , Hai Cheng , Chuan-Chou Shen , Yu-Min Chou","doi":"10.1016/j.gloplacha.2025.104954","DOIUrl":"10.1016/j.gloplacha.2025.104954","url":null,"abstract":"<div><div>The East Asian Summer Monsoon (EASM) exhibited millennial-scale oscillations during the Last Glacial Period, characterized by alternating cold stadials and warm interstadials that were broadly synchronous with climate changes in the North Atlantic. However, the mechanism linking regional hydroclimate variability to high- and low-latitude forcing remains debated. Here, we present precisely dated speleothem multi-proxy records, including δ<sup>18</sup>O, δ<sup>13</sup>C, and an environmental magnetic proxy (IRM<sub>soft-flux</sub>), spanning 46.92–39.18 kyr B.P. from Xianyun Cave, southeastern China. The IRM<sub>soft-flux</sub>, serves as an indicator of precipitation intensity, revealing increases during Dansgaard-Oeschger (DO) events 12 and 11, consistent with enhanced water vapor influx into southern China. Maximum moisture availability occurred between 43.96 and 42.98 kyr B.P., encompassing the DO 11 event and a weak monsoon interval, as corroborated by concurrent δ<sup>13</sup>C depletion, enhanced growth rate, and high initial <sup>234</sup>U/<sup>238</sup>U ratio. This period of increased hydrological activity coincides with the peak of the half-precession cycle, which influences the vertical temperature gradient in the equatorial western Pacific, as well as the minima of west-east sea surface temperature gradient (ΔSST) in the equatorial Pacific. During this El Niño-like state, a weakened East Asia Hadley circulation (EAHC) and a southward shift of the Western Pacific Subtropical High (WPSH) amplified moisture convergence over southern China. Our findings demonstrate that the thermocline variability in the tropical Pacific, propagated hydroclimatic signals to subtropical East Asia via ocean-atmosphere circulation coupling, particularly affecting regions near the water vapor source from tropical Pacific.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104954"},"PeriodicalIF":4.0,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523005","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

Corrigendum to “Climate change and cascading effects on nomadic societies in the Mongolian Steppe (16th–18th Century)” [Global and Planetary Change Volume 253 (2025) 104915] “气候变化和对蒙古草原游牧社会的级联效应（16 - 18世纪）”[全球与行星变化卷253(2025)104915]的勘误表

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-06-22 DOI: 10.1016/j.gloplacha.2025.104945

Likun Han , Zhixin Hao , Xunming Wang , Yang Liu , Danfeng Li

引用次数: 0

Contrasting short-term dynamics of supraglacial ponds along the Hindu Kush-Himalaya revealed by PlanetScope imagery and deep learning PlanetScope图像和深度学习揭示了兴都库什-喜马拉雅山脉冰川上池塘的短期动态对比

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-06-21 DOI: 10.1016/j.gloplacha.2025.104949

Xingyu Xu , Lin Liu , Lingcao Huang , Yan Hu , Guoqing Zhang , Adina Racoviteanu , Emily Victoria Liu , YingTo Agnes Chan

{"title":"Contrasting short-term dynamics of supraglacial ponds along the Hindu Kush-Himalaya revealed by PlanetScope imagery and deep learning","authors":"Xingyu Xu , Lin Liu , Lingcao Huang , Yan Hu , Guoqing Zhang , Adina Racoviteanu , Emily Victoria Liu , YingTo Agnes Chan","doi":"10.1016/j.gloplacha.2025.104949","DOIUrl":"10.1016/j.gloplacha.2025.104949","url":null,"abstract":"<div><div>An increasing number of supraglacial ponds have formed and expanded on the surface of debris-covered glaciers across the Hindu Kush-Himalaya (HKH) mountain range in the last decades. Despite the pronounced spatio-temporal variability observed in supraglacial ponds at annual and decadal scales, investigations of their seasonal changes are limited over large spatial scales. These investigations are critical for evaluating their impacts on glacier ablation and dynamics and predicting water resource availability. Here, we produced detailed seasonal maps of supraglacial ponds at five sites of the HKH for the years 2017 to 2022 using a deep-learning-based mapping method applied to PlanetScope imagery. Using these maps, we investigate pond seasonality and interannual variability. We found that (1) the average pond number and percentage ponded area over the debris-cover area were higher in the Central Himalaya (417, 1.55%) and Eastern Himalaya (481, 1.93%) compared to those in the Hindu Kush (142, 0.20%) and Western Himalaya (153, 0.19%); (2) pond percentage area over debris-cover area showed an increase in the Karakoram (+0.2% in an absolute sense), Central Himalaya (+0.6%) between 2017 and 2020, and Eastern Himalaya (+0.9%) between 2018 to 2021; (3) supraglacial ponds reached their peak at the onset of the ablation season (May-June) in the Karakoram and the Hindu Kush, during the pre-monsoon season in the Western and Central Himalaya, and during the monsoon or post-monsoon period in the Eastern Himalaya; (4) the Central Himalaya displayed a highest occurrence of persistent ponds (17.2%), while only 4.3% of supraglacial ponds in the Karakoram were persistent. Our results provide a spatially diverse and temporally detailed dataset that serves to advance the understanding of supraglacial pond dynamics across the Hindu Kush-Himalaya.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104949"},"PeriodicalIF":4.0,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337681","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

Holocene dust storms and their driving mechanisms on the northeastern Tibetan Plateau 青藏高原东北部全新世沙尘暴及其驱动机制

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-06-21 DOI: 10.1016/j.gloplacha.2025.104946

Tiancheng Zhou , Weiyu Cao , Xiaohuan Hou , Yunqing Li , Xianyong Cao , Fang Tian

{"title":"Holocene dust storms and their driving mechanisms on the northeastern Tibetan Plateau","authors":"Tiancheng Zhou , Weiyu Cao , Xiaohuan Hou , Yunqing Li , Xianyong Cao , Fang Tian","doi":"10.1016/j.gloplacha.2025.104946","DOIUrl":"10.1016/j.gloplacha.2025.104946","url":null,"abstract":"<div><div>The Tibetan Plateau (TP) is an important dust source region, where frequent dust storms substantially impact the regional ecological environment and even the global climate system. However, the driving mechanisms of dust storms on the northeastern TP during the Holocene are unclear due to the scarcity of geological archives. In this study, a sediment core from Koucha Lake on the northeastern TP was analyzed for grain size, geochemical elements, along with total organic carbon (TOC) and total nitrogen (TN), to infer the Holocene dust storm history and explore the likely driving mechanisms. Our findings indicate that during the late Holocene, especially after 6.9 cal ka BP, dust storm activity intensified with significant fluctuations, reaching a peak after 5 cal ka BP. Notably, our comparison with other climatic environmental records reveals that the pattern of dust storm enhancement during the Holocene diverges from the prevailing trend of increasing moisture availability and vegetation cover, suggesting that these factors may play a limited role in modulating dust storms on the northeastern TP. Instead, the enhancement of dust storms on the northeastern TP during the late Holocene is closely associated with the southward shift of the westerly jet. By revealing dust storm evolution and its mechanisms on the northeastern TP, our study provides a scientific basis for forecasting the future dust storm changes and developing regionally targeted dust mitigation strategies.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104946"},"PeriodicalIF":4.0,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337630","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

Lightning-ignited wildfire prediction in the boreal forest of northeast China 中国东北北方寒带森林闪电引发的野火预测

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-06-20 DOI: 10.1016/j.gloplacha.2025.104948

Cong Gao , Chunming Shi , Jinbao Li , Junran Li , Xu Zhang , Xinyan Huang , Fangzhong Shi , Jing Yang , Ye Bai , Xiaodong Liu

{"title":"Lightning-ignited wildfire prediction in the boreal forest of northeast China","authors":"Cong Gao , Chunming Shi , Jinbao Li , Junran Li , Xu Zhang , Xinyan Huang , Fangzhong Shi , Jing Yang , Ye Bai , Xiaodong Liu","doi":"10.1016/j.gloplacha.2025.104948","DOIUrl":"10.1016/j.gloplacha.2025.104948","url":null,"abstract":"<div><div>Lightning-ignited fires are the leading fire type in boreal forests, where early warning systems are essential for effective fire suppression and loss reduction. However, the prediction of lightning ignitions and the identification of contributing factors have not been thoroughly investigated in the boreal forest of northeast China, a region that experienced the most frequent lightning fires and the largest burned areas in the country. This study develops a prediction model using the eXtreme Gradient Boosting (XGBoost) algorithm. The model integrates the cases of igniting and non-igniting lightning, along with datasets of weather, soil, topography, vegetation, and lightning in 2019–2023. An optimized repeated random undersampling method was implemented to address the imbalanced population of the three cases. The most accurate classifier (MAC) was obtained from training 1000 XGBoost classifiers, which achieves a prediction accuracy of 88.7 %. The MAC performance remains robust when tested on individual lightning fire days and within the entire study period, indicating its reliablity for lightning ignition nowcasting. Using the Shapley Additive exPlanations (SHAP) framework, we quantified the relative contributions of wildfire variables and their marginal effects on the lightning ignition. Results indicate that low surface soil moisture (an indicator of fuel dryness) and low lightning density (associated with little precipitation) are the dominant factors for lightning ignition. Overall, the MAC significantly outperforms traditional fire danger rating indices, suggesting that weather conditions alone are inadequate for lightning ignition prediction, and the effects of surface soil moisture and lightning activity should be considered.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104948"},"PeriodicalIF":4.0,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337631","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

Historical effects of organic matter sources and fire intensity on permafrost peatland carbon dynamic in northern Great Khingan Mountains (China) over the last millennium 近千年来大兴安岭北部多年冻土泥炭地有机质来源和火灾强度对碳动态的历史影响

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-06-20 DOI: 10.1016/j.gloplacha.2025.104947

Jinxin Cong , Guangxin Li , Dongxue Han , Guoping Wang , Chuanyu Gao

{"title":"Historical effects of organic matter sources and fire intensity on permafrost peatland carbon dynamic in northern Great Khingan Mountains (China) over the last millennium","authors":"Jinxin Cong , Guangxin Li , Dongxue Han , Guoping Wang , Chuanyu Gao","doi":"10.1016/j.gloplacha.2025.104947","DOIUrl":"10.1016/j.gloplacha.2025.104947","url":null,"abstract":"<div><div>Permafrost peatlands, which store nearly 144 Pg of carbon despite covering only 20 % of the permafrost region, are increasingly threatened by wildfires and shifts in organic matter (OM) sources due to climate warming. However, limited data exist on the relationships between fire, OM sources, and carbon dynamics in peatlands under changing climatic conditions. The long-term effects of fire intensity and vegetation shifts on permafrost peatland carbon pools remain poorly understood. In this study, we used a <sup>14</sup>C age-depth model to reconstruct historical variations in OM sources and fire intensity based on the chemical properties of OM and pyrogenic carbon in the Hongtu (HT) and Jintao (JT) permafrost peatlands of the northern Great Khingan Mountains, China. We also evaluated their impacts on peatland carbon dynamics over the past millennium. Our results show that shrubs were the dominant OM source, contributing 88.2 ± 14.6 % of total OM in the JT peat core and 78.8 ± 21.5 % in the HT peat core. The occurrence of moderate fires promoted a higher proportion of shrubs in total OM. However, a high-intensity fire caused the OM sources to shift from shrubs to herbs, notably in the JT peatland between 300 and 200 cal. yr. B.P., which significantly decreased carbon stability. Compared to herbs and mosses, a higher proportion of shrubs in OM was associated with increased carbon accumulation rates (CARs) and greater long-term carbon stability in permafrost peatlands. As the fire intensity increased, the peatland CARs initially increased and then declined, whereas the carbon pool stability steadily improved. Considering both CARs and carbon stability, a moderate fire intensity was found to enhance the accumulation of more stable carbon in peatland carbon pools over the long term, suggesting that it may be more beneficial for peatland carbon sink functions than other fire intensity levels.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104947"},"PeriodicalIF":4.0,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337629","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

Anthropogenic activities have greatly altered mangroves over the last hundred years 在过去的一百年里，人为活动极大地改变了红树林

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-06-20 DOI: 10.1016/j.gloplacha.2025.104950

Yao Zhang , Guangming Zhao , Ken W. Krauss , Lianghao Pan , Yuanqin Xu , Xianwei Meng

{"title":"Anthropogenic activities have greatly altered mangroves over the last hundred years","authors":"Yao Zhang , Guangming Zhao , Ken W. Krauss , Lianghao Pan , Yuanqin Xu , Xianwei Meng","doi":"10.1016/j.gloplacha.2025.104950","DOIUrl":"10.1016/j.gloplacha.2025.104950","url":null,"abstract":"<div><div>Mangroves not only provide ecosystem and cultural services but also contribute to the mitigation of global warming. Mangrove dynamics and their environmental responses as re-constructed from the past can inform current mangrove conservation and restoration. However, our understanding of mangrove dynamics over the past century and the impact of human activities on these ecosystems remains limited. Using the quantified mangrove-derived organic carbon (MOC) contributions of seven sediment cores, we reconstructed the historical mangrove dynamics in Yingluo Bay and the Maowei Sea in tropical China dating back to 1900. The results indicated that the natural undisturbed mangroves in Yingluo Bay flourished in response to rising temperatures. In contrast, the significantly human-disturbed mangroves in Maowei Sea experienced a marked decline. Although both areas share similar natural conditions, intense anthropogenic disturbance reversed the natural potential for mangrove growth in the Maowei Sea. To explore the global prevalence of this phenomenon, we compiled data on mangrove pollen, δ<sup>13</sup>C<sub>org</sub>, MOC, and mangrove area change from over 40 sites/regions worldwide, and re-constructed the natural and human-affected mangrove dynamics over the past century. Our findings indicated that, owing to the globally rising temperatures, natural undisturbed mangroves have gradually expanded as progressively more healthy forests, while human-disturbed mangroves exhibited three patterns: (1) continuous degradation, (2) flourishing-degradation, and (3) degradation-regeneration. Anthropogenic activities, such as seawall construction, aquaculture activity, agricultural expansion, logging, and urbanization have significantly reversed the natural health of mangroves such that any conservation and restoration strategy used for mangroves globally could inherently consider anthropogenic factors along with natural environmental change for better outcomes.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104950"},"PeriodicalIF":4.0,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337628","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

Polyphase intracontinental deformation of ancient suture zones correlated to multiple far-field collisions: A case study from the Xieyuguan Shear Zone, Northern Qinling Orogen 与多次远场碰撞相关的古缝合带多期陆内变形——以北秦岭造山带谢玉关剪切带为例

IF 4 1区地球科学

Global and Planetary Change Pub Date : 2025-06-19 DOI: 10.1016/j.gloplacha.2025.104944

Shengsi Sun , Yunpeng Dong , Bo Hui , Chao Cheng , Bo Zhou , Yixi Li , Bin Zhang , Mingpu Fan

{"title":"Polyphase intracontinental deformation of ancient suture zones correlated to multiple far-field collisions: A case study from the Xieyuguan Shear Zone, Northern Qinling Orogen","authors":"Shengsi Sun , Yunpeng Dong , Bo Hui , Chao Cheng , Bo Zhou , Yixi Li , Bin Zhang , Mingpu Fan","doi":"10.1016/j.gloplacha.2025.104944","DOIUrl":"10.1016/j.gloplacha.2025.104944","url":null,"abstract":"<div><div>Suture zones, as lithospheric weakness zones, are prone to reactivation during the late-stage tectonic evolution of composite orogens. They record multiple deformation events, which are crucial for unraveling the intracontinental tectonic evolution of orogens and understanding far-field stress transmission. The Qinling Orogenic Belt is a typical composite orogen formed by multiple collisions between the North and South China Blocks and subsequent intracontinental orogenesis. A combined study of geochemistry, fabric, thermobarometer, and geochronology was conducted on the Xieyuguan shear zone, which was a Neoproterozoic suture zone. The mineral assemblage, geochemistry and zircon U<img>Pb geochronology constrain the amphibolite facies metamorphism occurred under peak P-T conditions of 5.54–6.40 kbar and 671–695 °C at ca. 411 ± 4 Ma, related to collision between the North and South Qinling belts. This collision also formed the top-to-north thrusting of the Xieyuguan shear zone with I-type amphibole fabric. Amphibole <sup>40</sup>Ar/<sup>39</sup>Ar dating reveal the mylonites exhumed through <em>c.</em> 14–15 km depth at 275.9 ± 1.8 Ma, related to the Permian orogenic collapse. Accompanying the Triassic collision between the South Qinling and South China blocks along the Mianlue suture, the shear zone was affected by thermal events at ca. 207 ± 3 Ma. By synthesizing these results, we propose a P-T<img>D<img>t path deciphering the intracontinental deformational history of the Northern Qinling Belt, and reveal three phases of far-field processes reactivated the ancient suture zone, including collision caused compressional thrusting, post-collisional orogenic collapse and exhumation, and hydrothermal-fluid modification related to the collision.</div></div>","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"253 ","pages":"Article 104944"},"PeriodicalIF":4.0,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330068","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