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Laboratory experiments of carbon mineralization potential of the main terrestrial basalt reservoirs in China 中国主要陆相玄武岩储层碳矿化潜力的实验室实验
IF 8.5 1区 地球科学
Geoscience frontiers Pub Date : 2024-11-07 DOI: 10.1016/j.gsf.2024.101961
Yanning Pan , Yunhua Liu , Zengqian Hou , Qiang Sun , Nianzhi Jiao , Guochen Dong , Jihua Liu , Gaoxue Yang , Huiting Zhang , Hailiang Jia , Hao Huang
{"title":"Laboratory experiments of carbon mineralization potential of the main terrestrial basalt reservoirs in China","authors":"Yanning Pan ,&nbsp;Yunhua Liu ,&nbsp;Zengqian Hou ,&nbsp;Qiang Sun ,&nbsp;Nianzhi Jiao ,&nbsp;Guochen Dong ,&nbsp;Jihua Liu ,&nbsp;Gaoxue Yang ,&nbsp;Huiting Zhang ,&nbsp;Hailiang Jia ,&nbsp;Hao Huang","doi":"10.1016/j.gsf.2024.101961","DOIUrl":"10.1016/j.gsf.2024.101961","url":null,"abstract":"<div><div>Against the background of realizing the goal of “carbon peaking and carbon neutrality”, using basaltic rocks for carbon mineralization is one of the most promising approaches to reduce the rise in atmospheric CO<sub>2</sub> concentrations. This study conducted a series of experiments to assess carbon mineralization in nine basalt samples from the main terrestrial basalt reservoirs in China within CO<sub>2</sub>-H<sub>2</sub>O/brine-rock systems at low temperatures (≤35 °C). The results indicate that the secondary carbonates formed in the CO<sub>2</sub>-H<sub>2</sub>O/brine-basalt system are predominantly calcite rather than Mg-carbonate minerals at low temperatures (≤35 °C). Hence, at low temperatures (≤35 °C), basalt rich in Ca-bearing minerals promotes the formation of stable carbonate minerals more effectively than basalt containing Mg-bearing minerals. Furthermore, under conditions of low temperatures (≤35 °C) and pressures of approximately 3 MPa, the results suggest that alkaline olivine basalt, with a higher content of Ca-minerals and typical alkaline minerals (nepheline and Na-sanidine), exhibits the highest pH value and the highest amount of calcite. Hence, the alkaline minerals, nepheline and Na-sanidine, serve as pH buffers to increase the pH and promote the precipitation of calcite within CO<sub>2</sub>-H<sub>2</sub>O– basalt systems at low temperatures (≤35 °C). Among the nine evaluated basalts, basalt from the Shandong Linqu-Changle volcanic basin exhibits the highest rate of carbon mineralization at low temperatures (≤35 °C). Hence, Cenozoic alkaline olivine basalt from Shandong Linqu-Changle volcanic basin is one of the most promising basalt reservoirs in China for future in- situ carbonation. As for ex- situ carbonation, compared with olivine, diopside or Ca-plagioclase may be more appropriate for increasing ocean negative emissions.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 1","pages":"Article 101961"},"PeriodicalIF":8.5,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Detection of Earth’s free oscillation and analysis of the non-synchronous oscillation phenomenon of normal modes 地球自由振荡的探测和正常模式非同步振荡现象的分析
IF 8.5 1区 地球科学
Geoscience frontiers Pub Date : 2024-11-04 DOI: 10.1016/j.gsf.2024.101957
Yingqi Zhang , Gong Xu , Chenchen Wang , Yaxin Zhao , Zheng Mu , Yunhao Fan , Changwei Jing
{"title":"Detection of Earth’s free oscillation and analysis of the non-synchronous oscillation phenomenon of normal modes","authors":"Yingqi Zhang ,&nbsp;Gong Xu ,&nbsp;Chenchen Wang ,&nbsp;Yaxin Zhao ,&nbsp;Zheng Mu ,&nbsp;Yunhao Fan ,&nbsp;Changwei Jing","doi":"10.1016/j.gsf.2024.101957","DOIUrl":"10.1016/j.gsf.2024.101957","url":null,"abstract":"<div><div>Earth’s free oscillation can provide essential constraints for refining Earth models, inverting seismic source mechanisms, and studying the deep internal structure of the Earth. Large earthquakes can simultaneously excite numerous normal modes. Due to the Earth’s ellipticity, rotation, and internal heterogeneities, these normal modes undergo splitting, with the frequencies of singlets of normal modes becoming very close (only a few µHz apart). This imposes greater demands on the detection of normal modes. This paper introduces a novel method for normal mode detection based on the normal time–frequency transform (NTFT). Compared to classical FT spectrum methods and recent optimal sequence estimation (OSE), the proposed method not only detects more weak normal modes but also reveals the spatial distribution of the phase of each normal mode. Taking the detection of <sub>0</sub>S<sub>2</sub> as an example, the phase measurements of each singlet are spatially inconsistent. This phenomenon can provide prior information for other methods, such as product spectrum analysis (PSA), spherical harmonic stacking (SHS), multistation experiments (MSE), and OSE. Additionally, understanding the phase distribution patterns contributes to further study of geological structures, offering crucial foundational data and observational support.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 1","pages":"Article 101957"},"PeriodicalIF":8.5,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A novel flood conditioning factor based on topography for flood susceptibility modeling 基于地形的洪水调节因子在洪水敏感性模拟中的应用
IF 8.5 1区 地球科学
Geoscience frontiers Pub Date : 2024-11-01 DOI: 10.1016/j.gsf.2024.101960
Jun Liu, Xueqiang Zhao, Yangbo Chen, Huaizhang Sun, Yu Gu, Shichao Xu
{"title":"A novel flood conditioning factor based on topography for flood susceptibility modeling","authors":"Jun Liu,&nbsp;Xueqiang Zhao,&nbsp;Yangbo Chen,&nbsp;Huaizhang Sun,&nbsp;Yu Gu,&nbsp;Shichao Xu","doi":"10.1016/j.gsf.2024.101960","DOIUrl":"10.1016/j.gsf.2024.101960","url":null,"abstract":"<div><div>Flood is one of the most devastating natural hazards. Employing machine learning models to construct flood susceptibility maps has become a pivotal step for decision-makers in disaster prevention and management. Existing flood conditioning factors inadequately account for regional characteristics of flood in the depiction of topography, potentially leading to an overestimation of flood susceptibility in flat areas. Addressing this gap, this study proposes a novel flood conditioning factor, local convexity factor (LCF), to enhance the accuracy of flood susceptibility modeling. Initially, LCF is computed based on a standard normal Gaussian surface to highlight elevation variations in local terrain. Subsequently, LCF is applied to flood susceptibility modeling using seven machine learning models across four distinct basins. Comparative analysis is conducted between flood susceptibility maps with and without the application of LCF to evaluate its impact on flood susceptibility modeling. The results demonstrate that the proposed LCF can enhance the accuracy of flood susceptibility modeling to varying degrees, across the four basins investigated. The Fujiang basin exhibited the most substantial improvement, with its AUC improved from 0.861 to 0.886, Producer’s Agreement improved from 0.869 to 0.899, and Overall Agreement improved from 0.778 to 0.811. Comparation with hydrodynamic inundation maps shows that particularly in relatively flat terrain areas, flood susceptibility maps incorporating LCF offer more precise delineation between flood-prone and non-flood-prone zones. This research holds potential for widespread application in the prediction of flood susceptibility using machine learning models, providing a novel perspective for enhancing their accuracy.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 1","pages":"Article 101960"},"PeriodicalIF":8.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fifteen years of Geoscience Frontiers and moving forward 地球科学前沿》十五年及展望
IF 8.5 1区 地球科学
Geoscience frontiers Pub Date : 2024-11-01 DOI: 10.1016/j.gsf.2024.101955
Xuanxue Mo
{"title":"Fifteen years of Geoscience Frontiers and moving forward","authors":"Xuanxue Mo","doi":"10.1016/j.gsf.2024.101955","DOIUrl":"10.1016/j.gsf.2024.101955","url":null,"abstract":"","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"15 6","pages":"Article 101955"},"PeriodicalIF":8.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142699371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analyzing failure mechanisms and predicting step-like displacement: Rainfall and RWL dynamics in lock-unlock landslides 分析破坏机制并预测阶梯状位移:锁定-解锁滑坡中的降雨和 RWL 动力学
IF 8.5 1区 地球科学
Geoscience frontiers Pub Date : 2024-10-30 DOI: 10.1016/j.gsf.2024.101959
Xuekun Xiang , Haijia Wen , Jiafeng Xiao , Xiongfeng Wang , Hongyue Yin , Junhao Huang
{"title":"Analyzing failure mechanisms and predicting step-like displacement: Rainfall and RWL dynamics in lock-unlock landslides","authors":"Xuekun Xiang ,&nbsp;Haijia Wen ,&nbsp;Jiafeng Xiao ,&nbsp;Xiongfeng Wang ,&nbsp;Hongyue Yin ,&nbsp;Junhao Huang","doi":"10.1016/j.gsf.2024.101959","DOIUrl":"10.1016/j.gsf.2024.101959","url":null,"abstract":"<div><div>Lock-unlock landslides have thick sliding zones that store a lot of energy. This makes them start quickly, happen suddenly, and have serious consequences. Therefore, it becomes urgent to study the deformation and failure mechanisms of such landslides and develop rational predictive models. Taking the Jiuxianping landslide as an example, this study investigates the regularity of landslide displacement changes using multi-source data, focusing on the abrupt displacement patterns in the unlock phase. Furthermore, employing Transient Release and Inhalation Method tests combined with Geo-Studio’s SEEP/W and SIGMA/W modules for fluid–solid coupled simulation calculations, the evolution process of landslide failure mechanisms and deformation characteristics is analyzed and discussed. Lastly, utilizing data mining analysis of multi-source data, a hybrid optimized machine learning predictive model is established for model prediction comparison. The study reveals that: (1) The rise in infiltration line elevates pore water pressure, affecting the stability of the sliding zone, leading to “unlock effects” and step-like displacement deformation; (2) Simulation shows that YY208 is closer to the actual situation, located at the far bank position, while YY210 is greatly influenced by the “buoyancy effect”, resulting in a slowdown in deformation velocity; (3) After data preprocessing, overall actual displacement prediction performs better than simulation displacement prediction in terms of Mean Absolute Error, Mean Squared Error and Correlation Coefficient, but noise reduction processing can improve the periodic prediction effect of simulation displacement.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 1","pages":"Article 101959"},"PeriodicalIF":8.5,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Achieving environmental quality through stringent environmental policies: Comparative evidence from G7 countries by multiple environmental indicators 通过严格的环境政策实现环境质量:七国集团国家多种环境指标的比较证据
IF 8.5 1区 地球科学
Geoscience frontiers Pub Date : 2024-10-29 DOI: 10.1016/j.gsf.2024.101956
Mustafa Tevfik Kartal , Shahriyar Mukhtarov , Dervis Kirikkaleli
{"title":"Achieving environmental quality through stringent environmental policies: Comparative evidence from G7 countries by multiple environmental indicators","authors":"Mustafa Tevfik Kartal ,&nbsp;Shahriyar Mukhtarov ,&nbsp;Dervis Kirikkaleli","doi":"10.1016/j.gsf.2024.101956","DOIUrl":"10.1016/j.gsf.2024.101956","url":null,"abstract":"<div><div>Compatible with the increasing public interest on climate change, countries have taken measures to combat climate change and support environmental sustainability. Considering this fact, this study investigates whether environmental measures, proxied by the environmental policy stringency (EPS) index, are efficient in achieving sustainability of environment in G7 countries as the leading economies; uses multiple environmental sustainability indicators, and applies quantile methods from 1991/Q1 to through 2020/Q4. The results show that (i) EPS curbs carbon dioxide emissions in France and the United States across all quantiles. Also, it has a declining effect in Germany and Italy at lower quantiles and in Canada at lower and higher quantiles; (ii) EPS declines ecological footprint in United States across all quantiles, while it curbs in Canada and Germany at lower quantiles as well as in Italy and United Kingdom at higher quantiles; (iii) EPS stimulates load capacity factor in France, United Kingdom, and United States across all quantiles and in Canada at higher quantiles; (iv) causal effect of EPS on the environment varies throughout quantiles; (v) the robustness of the results by quantile regression method is verified. Overall, the results reveal that the effect of EPS on environmental sustainability differentiates across environmental indicators, countries, and quantiles. In ensuring environmental quality, EPS is completely helpful in the United States, fully inefficient in Japan, and has a mixed effect in remaining G7 countries.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 1","pages":"Article 101956"},"PeriodicalIF":8.5,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Aerosol spatiotemporal dynamics, source analysis and influence mechanisms over typical drylands 典型旱地上空的气溶胶时空动态、来源分析和影响机制
IF 8.5 1区 地球科学
Geoscience frontiers Pub Date : 2024-10-28 DOI: 10.1016/j.gsf.2024.101958
Yunfei Zhang , Xiangyue Chen , Fengtao Zhao , Qianrou Xia , Hanchen Xing , Mengdi Du
{"title":"Aerosol spatiotemporal dynamics, source analysis and influence mechanisms over typical drylands","authors":"Yunfei Zhang ,&nbsp;Xiangyue Chen ,&nbsp;Fengtao Zhao ,&nbsp;Qianrou Xia ,&nbsp;Hanchen Xing ,&nbsp;Mengdi Du","doi":"10.1016/j.gsf.2024.101958","DOIUrl":"10.1016/j.gsf.2024.101958","url":null,"abstract":"<div><div>As globally important dust source areas, drylands not only have extremely fragile ecosystems that are exceptionally sensitive to global climate change but also have important implications for global warming and carbon cycling. However, the detailed dryland aerosol characteristics are not clear, especially the influence mechanisms of dryland aerosols, which are poorly understood. In this paper, Utilizing the Xinjiang Uygur Autonomous Region (XJ) as a target area, based on high spatial resolution aerosol optical depth (AOD) data, combined with the trend analysis, backward trajectory, source analysis, and machine learning methods, we systematically analyzed the multiscale dynamic characteristics of aerosols in XJ over a long period. Simultaneously, we also quantitatively explored the source distributions of high aerosols at typical sites at different time scales. Furthermore, we discussed the specific effects of natural and anthropogenic factors on aerosols in XJ and its subregions. The results show that 72.45% of the AOD in XJ presents an increasing trend from 2000 to 2019, 27.56% of which passed the significance test, mainly concentrated in northern Xinjiang (NXJ). The AOD in southern Xinjiang (SXJ) is the largest (0.240 ± 0.154), followed by eastern Xinjiang (EXJ) (0.157 ± 0.038), and the AOD in NXJ is the smallest (0.134 ± 0.028); however, the AOD in NXJ has the most obvious increasing trend, peaking in 2011, and the AOD in XJ remains low and stable at 5000 m elevation and above. The backward trajectory shows that nearly half of the potential paths of high AOD in SXJ are from the Taklamakan Desert, most of the potential paths in NXJ are from transboundary transmission, mostly through exposed lake beds, and most of the potential paths in EXJ are from the northwest, with characteristics similar to those of NXJ. The exposed lake beds provide salt dust, which further exacerbates the complexity and hazards of aerosols in NXJ and EXJ. The potential source areas for AOD in SXJ are concentrated in the northeast of the target site, those in NXJ are concentrated in the west of the target site, and those in EXJ are in the northwest and east. The AOD in SXJ (63.92%) and EXJ (74.83%) or XJ (57.77%) is dominated by natural factors, whereas the magnitude of AOD in NXJ (84.01%) is largely explained by anthropogenic factors.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 1","pages":"Article 101958"},"PeriodicalIF":8.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Do we really need to drill through the intact ocean crust? 我们真的需要钻穿完整的海洋地壳吗?
IF 8.5 1区 地球科学
Geoscience frontiers Pub Date : 2024-10-22 DOI: 10.1016/j.gsf.2024.101954
Yaoling Niu
{"title":"Do we really need to drill through the intact ocean crust?","authors":"Yaoling Niu","doi":"10.1016/j.gsf.2024.101954","DOIUrl":"10.1016/j.gsf.2024.101954","url":null,"abstract":"<div><div>We must persevere to drill through the intact ocean crust to fully address fundamental questions towards completion of the plate tectonics theory. The primary questions include: what is the ocean crust made up of, how thick is it and what is the petrological nature of the crust-mantle boundary (i.e., Mohorovičić discontinuity or Moho)? These questions may sound naive because they are widely believed to be well-understood facts, but they are not. Correctly, our current knowledge remains incomplete, and some popular misperceptions come from interpretations based on convenient assumptions. One assumption is that the ocean crust inferred from seismic data is of magmatic origin. Testing this assumption is a principal motivation of <em>Project Mohole</em> (1957–1966), attempting to drill intact ocean crust across the Moho into the mantle. <em>Project Mohole</em> failed because of its high cost, engineering challenges and insufficient tries, but the technologies developed made subsequent ocean drilling successful. However, answers to the original questions remain unsatisfactory. For example, seismic crust interpreted to be of magmatic origin is shown to have globally uniform thickness of 6.0 ± 1.0 km, but crust with such thickness at many slow-spreading ridge segments is dominated by serpentinized mantle peridotites exposed on seafloors. Therefore, the popular view on ocean ridge magmatism must be re-examined, which needs intact ocean crust drilling into the mantle. Drilling at geologically simple sites in the fast-spreading Pacific seafloor is most promising.</div><div>The US-led <em>D/V JOIDES Resolution</em> that has well served the scientific ocean drilling since 1985 is to retire by the end of 2024, but timely the Chinese geoscience community wishes to continue this international endeavor using the purpose-built <em>D/V Meng Xiang</em> to be in service in 2025. The international community is to gather in November 24–27, 2024, Guangzhou, China, to discuss strategies on where and how to successfully drill intact ocean crust across the Moho in coming years.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 1","pages":"Article 101954"},"PeriodicalIF":8.5,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142577860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Combined study of Au-bearing arsenopyrite of orogenic gold deposits (NE Asia): High resolution 3D X-ray computed tomography, LA-ICP-MS, and EMPA data 成因金矿床(亚洲东北部)含金黄砷矿的综合研究:高分辨率三维 X 射线计算机断层扫描、LA-ICP-MS 和 EMPA 数据
IF 8.5 1区 地球科学
Geoscience frontiers Pub Date : 2024-10-18 DOI: 10.1016/j.gsf.2024.101953
Evgeny Naumov , Yuri Kalinin , Galina Palyanova , Lyudmila Kryuchkova , Viacheslav Voitenko , Vera Abramova , Franco Pirajno
{"title":"Combined study of Au-bearing arsenopyrite of orogenic gold deposits (NE Asia): High resolution 3D X-ray computed tomography, LA-ICP-MS, and EMPA data","authors":"Evgeny Naumov ,&nbsp;Yuri Kalinin ,&nbsp;Galina Palyanova ,&nbsp;Lyudmila Kryuchkova ,&nbsp;Viacheslav Voitenko ,&nbsp;Vera Abramova ,&nbsp;Franco Pirajno","doi":"10.1016/j.gsf.2024.101953","DOIUrl":"10.1016/j.gsf.2024.101953","url":null,"abstract":"<div><div>The distribution of gold in small acicular arsenopyrite of a pyrite-arsenopyrite association from Suzdal (Eastern Kazakhstan), Olympiada (Yenisei Ridge, Russia) and large pseudorhombic arsenopyrite crystals from Bazovskoe (Yakutia, Russia) orogenic-type deposits were investigated. On orogenic gold deposits in NE Asia, occurring mainly in black shales, two productive stages of ore deposition are distinguished, which correspond to two morphological varieties of arsenopyrite. At the early stage, fine-grained acicular-prismatic arsenopyrite with invisible gold was deposited; at the late stage, tabular arsenopyrite in association with free visible gold was formed. The samples of gold-bearing arsenopyrite were analyzed using Scanning Electron Microscopy, Electron Microprobe Analyses, Atomic Absorption and Laser Ablation Inductively Coupled Plasma Mass Spectrometry in combination with High Resolution 3D X-ray Computed Tomography (HRXCT). HRXCT does not destroy the studied mineral during the investigation. That technique permits to do an estimation of the amount of gold inclusions in minerals or host rocks and draw reasonable conclusions about the gold content of the ores, to study in detail the distribution patterns of metal inclusions (associated with certain minerals, cracks, crystal growth faces, etc.) and to determine the form of the gold. It can be used to understanding of the genesis of productive mineral associations, and to developing optimal technological schemes for gold extraction.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 1","pages":"Article 101953"},"PeriodicalIF":8.5,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Late Triassic to Middle Jurassic magmatism in the Eastern Pontides (NE Türkiye): Evidence for divergent double subduction of Paleo-Tethys lithosphere 东庞提德山脉(图尔基耶东北部)晚三叠世至中侏罗世岩浆活动:古地台岩石圈分异双俯冲的证据
IF 8.5 1区 地球科学
Geoscience frontiers Pub Date : 2024-10-06 DOI: 10.1016/j.gsf.2024.101952
Yener Eyuboglu , Ze Liu , Dicheng Zhu , Nilanjan Chatterjee , Liangliang Zhang , Jincheng Xie , Francis O. Dudas
{"title":"Late Triassic to Middle Jurassic magmatism in the Eastern Pontides (NE Türkiye): Evidence for divergent double subduction of Paleo-Tethys lithosphere","authors":"Yener Eyuboglu ,&nbsp;Ze Liu ,&nbsp;Dicheng Zhu ,&nbsp;Nilanjan Chatterjee ,&nbsp;Liangliang Zhang ,&nbsp;Jincheng Xie ,&nbsp;Francis O. Dudas","doi":"10.1016/j.gsf.2024.101952","DOIUrl":"10.1016/j.gsf.2024.101952","url":null,"abstract":"<div><div>The Meso-Cenozoic geodynamic evolution of northern Türkiye remains a subject of debate primarily due to a lack of systematic geological, geochemical, geochronological, and geophysical investigations. This paper presents comprehensive geochronological and geochemical data on the Late Triassic andesite porphyry, andesite breccia and quartz diorite porphyry, and the Middle Jurassic diabase, and amphibole-poor and amphibole-rich andesite porphyry from Çevrepınar Igneous Complex (Gümüşhane) in the southern part of the Eastern Pontides Orogenic Belt (EPOB), a well-preserved continental arc in the Alpine-Himalayan orogen. Zircon U–Pb geochronology indicates crystallization ages of ∼208–202 Ma (Rhaetian) for the Late Triassic rocks and ∼175–172 Ma (Aalenian) for the Middle Jurassic rocks. Whole-rock geochemical and Sr-Nd-Pb isotopic data, and zircon <em>ε</em><sub>Hf</sub>(<em>t</em>) data indicate that both the Late Triassic and the Middle Jurassic rocks originated by low-degree melting of a spinel lherzolite lithospheric mantle source modified by subduction-related fluids and/or melts. Based on the new and published data, we suggest that the Late Triassic to Middle Jurassic arc magmatism in EPOB occurred as a result of southward subduction of the Paleo-Tethys oceanic lithosphere beneath the northern margin of Gondwana-Land. Late Triassic to Jurassic arc magmatism and basin evolution occurred synchronously in the northern and southern peripheries of the present-day Eastern Black Sea Basin, indicating divergent double subduction of the Paleo-Tethys oceanic lithosphere beneath the northern margin of Gondwana and southern margin of Laurasia during the Early Mesozoic.</div></div>","PeriodicalId":12711,"journal":{"name":"Geoscience frontiers","volume":"16 1","pages":"Article 101952"},"PeriodicalIF":8.5,"publicationDate":"2024-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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