Acta Geochimica最新文献

{"title":"Correlations between trace elements in pyrite and gold mineralization of gold deposits on the North China platform","authors":"Jianzhao Yin, Ying Sun, Haoyu Yin, Hongyun Shi, James Sparling, Yuhong Chao, Shoupu Xiang","doi":"10.1007/s11631-023-00636-4","DOIUrl":"10.1007/s11631-023-00636-4","url":null,"abstract":"<div><p>By studying both the microscopic physical and chemical typomorphic characteristics of typical mineral pyrite samples associated with representative gold deposits on the north-central margin of the North China Platform, this paper seeks to identify macroscopic metallogenic mechanisms of gold deposits and to reveal the formation mechanism of lattice gold in pyrite. Typomorphic characteristics of pyrite reveal that pyrite grain size has a negative correlation with gold content. Cubic pyrite, as the dominant crystal form, contains more gold than pentagonal dodecahedral pyrite. Both pyrite crystal forms and chemical compositions indicate that the replacement style of gold deposit formed in a low saturability, low sulfur fugacity, and at temperatures either much higher or much lower than its best forming temperature; comparatively, that of the quartz vein style of gold deposit occurred under conditions with the best temperature, rich in sulfur, and with high sulfur fugacity. The Au/Ag ratios of the pyrites show that both the replacement and quartz vein styles of deposits are mesothermal and hypothermal, while the Co/Ni ratios of the pyrites indicate that the quartz vein style is of magmatic-hydrothermal origin. The X-ray diffraction intensity of pyrite rich in gold is lower than that of pyrite poor in gold at the quartz vein style. In general, with an increase in gold content in pyrite, the total sum intensity ΣI decreases. The pyroelectricity coefficient has a negative correlation trend with the values of (Co + Ni + Se + Te)-As and (Co + Ni + Se + Te)/As. The pyrite pyroelectricity of the replacement style is N-type, indicating that it formed under low sulfur fugacity, while that of the quartz vein style is a mixture of P-N types, indicating that it formed under high sulfur fugacity. On the pyroelectricity-temperature diagram, pyrite of the replacement style is mainly distributed between 200 and 270 °C, while that of the quartz vein style varies between 90–118 and 274–386 °C, demonstrating a multistage forming process. In contrast to previous researchers’ conclusions, the authors confirm the existence of lattice gold in pyrites through the use of an electron paramagnetic resonance (EPR) test. Au in the form of Au<sup>+</sup>, entering pyrite as an isomorph and producing electron–hole centers, makes the centers produce spin resonance absorption and results in EPR absorption peak II. The intensity of auriferous pyrite absorption peak II has certain direct positive correlations with pyrite gold content. The #I and #III absorption peaks of pyrites possibly result from the existence of Ni<sup>2+</sup> and/or Cu<sup>2+</sup>. γ<sub>1</sub>, γ<sub>2</sub>, and γ<sub>3</sub> are the strongest and most typical absorption peaks of the infrared spectra of the pyrites. Generally, with the increase in gold content in the pyrite samples, γ<sub>1</sub>, γ<sub>2</sub>, and γ<sub>3</sub> tend to shift to higher wavenumbers, and the gold content in the pyrite s","PeriodicalId":7151,"journal":{"name":"Acta Geochimica","volume":"42 6","pages":"1079 - 1103"},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11631-023-00636-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50050663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geochemistry of the Aptian bituminous limestones in Gümüşhane area, Eastern Black Sea region: new insight into paleogeography and paleoclimate conditions","authors":"Merve Özyurt","doi":"10.1007/s11631-023-00623-9","DOIUrl":"10.1007/s11631-023-00623-9","url":null,"abstract":"<div><p>Aptian is characterized by widespread deposition of organic-rich sediment. The Aptian bitumen limestone horizon, which is thin decimetre-thick sequences, locally crops out in the Kırcaova area, Eastern Black Sea Region (Eastern Pontides). They are well correlated with Aptian bitumen limestone in the other Tethys Reams. They are proposed as episodes of increased organic matter. However, background factors controlling organic matter enrichment are poorly known. In this study, we present new inorganic geochemistry, including trace elements, rare earth elements (REE), redox-sensitive elements (RSE), stable-isotopes (δ¹⁸O and δ¹³C), and total organic carbon (TOC). We integrated new geochemical data with existing stratigraphy, paleontology, and organic chemistry data to provide new insight into the depositional environment and paleoclimate conditions during Aptian. The lacustrine bitumen limestone (LBL) samples have varied δ¹³C (ave. -1.45‰) and δ¹⁸O (ave.-4.50‰). They possess distinct REE patterns, with an average of REE (ave. 14.45 ppm) and Y/Ho (ave. 35) ratios. In addition, they have variable Nd/Yb_N (0.28–0.81; ave. 0.56) and Ce/Ce* (0.68–0.97; ave. 0.86), and relatively high Eu*/Eu (1.23–1.53; ave. 1.35). They display seawater signatures with reduced oxygen conditions. The enrichment in RSE (Mo, Cu, Ni, and Zn) and the low Mo/TOC (0.70–3.69; ave. 2.41) support a certain degree of water restriction. The high Sr/Ba, Sr/Cu, Ga/Rb, and K/Al records of the LBL facies suggest hot house climatic conditions. The sedimentary environment was probably an isolated basin that is transformed from the marine basin. In addition to depositional conditions, the regional parameters such as the climate, increased run-off period, nutrient levels, alkalinity level, and dominant carbonate producers favored the enrichment in organic matter of LBL facies. Thus, extreme greenhouse palaeoclimate conditions have an important role in organic matter enrichment in the isolated basin. Our results are conformable with the published data from marine, semi-restricted basin, and lacustrine settings in the different parts of the Tethys margin. Thus, this approach provides the first insight into the Aptian greenhouse paleo-climate conditions of the Eastern Black Sea Region, NE Turkey.</p></div>","PeriodicalId":7151,"journal":{"name":"Acta Geochimica","volume":"42 6","pages":"971 - 987"},"PeriodicalIF":0.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50045114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal expansivity of geikielite and ilmenite utilizing in-situ synchrotron X-ray diffraction at high temperature","authors":"Jiamei Song,&nbsp;Dawei Fan,&nbsp;Shijie Huang,&nbsp;Shanrong Zhang,&nbsp;Mengzeng Wu,&nbsp;Wei Chen,&nbsp;Wenge Zhou","doi":"10.1007/s11631-023-00632-8","DOIUrl":"10.1007/s11631-023-00632-8","url":null,"abstract":"<div><p>The unit-cell parameters and volumes of geikielite (MgTiO₃) and ilmenite (FeTiO₃) were investigated at high temperatures up to 700 K and ambient pressure, using in-situ angle-dispersive synchrotron X-ray diffraction. No phase transition was detected over the experimental temperature range. Using (Berman in J Petrol 29:445–522, 1988. 10.1093/petrology/29.2.445) equations to fit the temperature-volume data, the volumetric thermal expansion coefficients at ambient conditions (<i>α</i>_<i>V</i>0) of MgTiO₃ and FeTiO₃ were obtained as follows: 2.55 (6) × 10^–5 K⁻¹ and 2.82 (10) × 10^–5 K⁻¹, respectively. We infer that the larger effective ionic radius of Fe²⁺(VI) (0.78 Å) than that of Mg²⁺(VI) (0.72 Å) renders FeTiO₃ has a larger volumetric thermal expansivity than MgTiO₃. Simultaneously, the refined axial thermal expansion coefficients under ambient conditions are <i>α</i>_<i>a</i>0 = 0.74 (3) × 10^–5 K⁻¹ and <i>α</i>_<i>c</i>0 = 1.08 (5) × 10^–5 K⁻¹ for the <i>a</i>-axis and <i>c</i>-axis of MgTiO₃, respectively, and <i>α</i>_<i>a</i>0 = 0.95 (5) × 10^–5 K⁻¹ and <i>α</i>_<i>c</i>0 = 0.92 (12) × 10^–5 K⁻¹ for the <i>a</i>-axis and <i>c</i>-axis of FeTiO₃, respectively. The axial thermal expansivity of MgTiO₃ is anisotropic, but that of FeTiO₃ is nearly isotropic. We infer that the main reason for the different axial thermal expansivity between MgTiO₃ and FeTiO₃ is that the thermal expansion mode of the Mg-O bond in MgTiO₃ is different from that of the Fe–O bonds in FeTiO₃.</p></div>","PeriodicalId":7151,"journal":{"name":"Acta Geochimica","volume":"42 6","pages":"988 - 997"},"PeriodicalIF":0.0,"publicationDate":"2023-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50081648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Petrogenesis of Oligocene volcanic rocks of the Lake Tana area, Ethiopian large Igneous Province","authors":"Ayenachew Alemayhou Desta,&nbsp;Asfawossen Asrat,&nbsp;Minyahl Teferi Desta","doi":"10.1007/s11631-023-00634-6","DOIUrl":"10.1007/s11631-023-00634-6","url":null,"abstract":"<div><p>The Lake Tana area is located within a complex volcano-tectonic basin on the northwestern Ethiopian plateau. The basin is underlain by a thick succession of Oligocene transitional basalts and sub-alkaline rhyolites overlain in places, particularly south of the lake, by Quaternary alkaline to mildly transitional basalts, and dotted with Oligo-Miocene trachyte domes and plugs. This paper presents the results of integrated field, petrographic, and major and trace element geochemical studies of the Lake Tana area volcanic rocks, with particular emphasis on the Oligocene basalts and rhyolites. The studies reveal a clear petrogenetic link between the Oligocene basalts and rhyolites. The Oligocene basalts are: (1) plagioclase, olivine, and/or pyroxene phyric; (2) show an overall decreasing trend in MgO, Fe₂O₃, and CaO with silica; (3) have relatively low Mg#, Ni and Cr contents and high Nb/La and Nb/Yb ratios; and (4) show LREE enriched and generally flat HREE patterns. All these imply the origin of the Oligocene basalts by shallow-level fractional crystallization of an enriched magma sourced at the asthenospheric mantle. The Oligocene rhyolites: (1) are enriched in incompatible while depleted in compatible trace elements, P and Ti; (2) show a strong negative Eu anomaly; (3) contain appreciable amounts of plagioclase, apatite, and Fe-Ti oxides; and (4) show clear geochemical similarity with well-constrained rhyolites from the Large Igneous Province (LIP) of the northwestern Ethiopian plateau. Low-pressure fractional crystallization of mantle-derived basaltic magma in crustal magma chambers explains the origin of these rhyolites. Our study further shows that the Oligocene basalts and rhyolites are co-genetic and the felsic rocks of the Lake Tana area are related differentiates of the flood basalt volcanism in the northwestern Ethiopian plateau.</p></div>","PeriodicalId":7151,"journal":{"name":"Acta Geochimica","volume":"42 6","pages":"1104 - 1123"},"PeriodicalIF":0.0,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11631-023-00634-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50017429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-precision double-spike Cd isotopic measurements of seawater by MC-ICP-MS and its application to seawater affected by hydrothermal vent fluids","authors":"Chuanwei Zhu,&nbsp;Yunzhu Wu,&nbsp;Hanjie Wen,&nbsp;Guanghai Wu,&nbsp;Wenrui Song,&nbsp;Yuxu Zhang,&nbsp;Bo Zhao","doi":"10.1007/s11631-023-00628-4","DOIUrl":"10.1007/s11631-023-00628-4","url":null,"abstract":"<div><p>Cadmium (Cd) isotopes in seawater have been proven as an important geochemical tool for tracing ocean Cd circulation in the modern ocean. In this study, we evaluated a new method to separate Cd (~ 60 ng) from seawater using Chelex resin (1.0 g) coupled with AG-MP-1M resin. The results show that the Chelex resin is sufficient to remove Cd from Na and Mg matrix with Cd recoveries at 98.3 ± 3.5 % (2SD, N = 6); while AG-MP-1M resin could separate Cd from the residual Na, Mg, and isobaric inferences. The total Cd recoveries of the method are 96.3 ± 1.5 % (2SD; N = 4) and the salinity of the samples has no significant impacts on Cd recovery. Cd isotope ratios were measured using a Nu Plasma III MC-ICP-MS and ¹¹¹Cd–¹¹⁰Cd double spike technique. By comparing the δ^114/110Cd values (0.00 ± 0.06‰) of synthetic seawaters doped with Cd isotope standard (NIST-3108; treated by Chelex + AG-MP-1M resin) and the reference value (~ 0.00 ‰), no variations were observed. We also analyzed the Cd isotope compositions of three deep seawaters from a column at the Southwest Indian Ocean Ridges (SWIR). The δ^114/110Cd values of the column are decreased from 1.05 ± 0.05 ‰ at 3200 m to 0.36 ± 0.05 ‰ at 2800 m, differing from reported δ^114/110Cd values of deep seawater in other oceans. Considering the spatial distance between the column and active hydrothermal vents in SWIR (~ 13 km), we propose that such positive δ^114/110Cd values of deep seawater were likely contaminated by vent fluids, which could provide heavy Cd isotope to deep seawaters. This study demonstrates that Cd isotope is more sufficient to distinguish the impact of plumes on deep seawater.</p></div>","PeriodicalId":7151,"journal":{"name":"Acta Geochimica","volume":"42 5","pages":"934 - 942"},"PeriodicalIF":0.0,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50017430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The impact of climate change on groundwater quantity and quality in a semi-arid environment: a case study of Ain Azel plain (Northeast Algeria)","authors":"Hasna Aouati,&nbsp;Abdeslam Demdoum,&nbsp;Houria Kada,&nbsp;Riad Kouadra","doi":"10.1007/s11631-023-00633-7","DOIUrl":"10.1007/s11631-023-00633-7","url":null,"abstract":"<div><p>In the last decade, North Africa has witnessed significant population growth, particularly those bordering the Mediterranean Sea. This led to increased demand for groundwater, which is an essential source for various water uses such as drinking water supplies and irrigation. Generally, human activities play a crucial role in the different quantitative and qualitative changes in groundwater. Now, climate changes such as a decrease in precipitation have also led to a shortage of water resources and a decline in the groundwater table. This paper presents the impact of climate changes on groundwater resources in the Ain Azel region, Setif, northeastern Algeria. The analysis of long-term spatiotemporal variability in rainfall over 63 years (1958–2021) revealed a significant decline in groundwater recharge, especially after 2013. In contrast, the Pettitt and Mann–Kendall tests show increased temperatures with breaks between 1984 and 1986. A piezometric analysis of the alluvial aquifer demonstrated a significant decline in groundwater levels in the last 20 years. Hydrochemical analysis showed that groundwater in the region is dominated by Ca–Mg–Cl water type, which indicates the presence of water salinity phenomenon. Water Quality Index (WQI) analysis showed the deterioration of groundwater in the area, which may be caused by several factors: brine intrusion from the Salt Lake (Sebkha) in the north; the dissolution of evaporites (Triassic) and/or anthropogenic sources of agricultural and industrial origin. Our findings provide an overview summarizing the state of groundwater, which will help improve groundwater resource management in the region in the coming years.</p></div>","PeriodicalId":7151,"journal":{"name":"Acta Geochimica","volume":"42 6","pages":"1065 - 1078"},"PeriodicalIF":0.0,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50013960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In situ infiltration-precipitation processes in some rock systems","authors":"Zahraa Ibrahim,&nbsp;Rabih Sultan","doi":"10.1007/s11631-023-00629-3","DOIUrl":"10.1007/s11631-023-00629-3","url":null,"abstract":"<div><p>We carry out a chemical treatment (acidization or basification) of typical rock specimens in-situ, and characterize the emerging pattern resulting from the infiltration-precipitation scenario. Galena and limestone samples were treated with sulfuric acid, while pyrite was reacted with sodium hydroxide. Various infiltration techniques were employed, after selection of the most feasible method for each rock separately. The patterns of anglesite (PbSO₄), anhydrite (CaSO₄) and goethite (FeOOH) deposition presented different alteration modes of the bare rock textures. Among the three deposited minerals, only the anhydrite (CaSO₄) displayed a band stratification. The formation of a Liesegang pattern in the rock of highest porosity indicates a plausible correlation between the band formation and a minimum porosity requirement. A banded rock of compact texture could then be formed by a cementation mechanism, governing the long time evolution of the rock. </p></div>","PeriodicalId":7151,"journal":{"name":"Acta Geochimica","volume":"42 5","pages":"870 - 878"},"PeriodicalIF":0.0,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50047124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geochemical characterization of rare earth elements in sediment profiles from the Oualida lagoon (Morocco)","authors":"Nezha Mejjad,&nbsp;Abdelmourhit Laissaoui,&nbsp;Ouafa El Hammoumi,&nbsp;Ahmed Fekri,&nbsp;Hamid Amsil","doi":"10.1007/s11631-023-00631-9","DOIUrl":"10.1007/s11631-023-00631-9","url":null,"abstract":"<div><p>The present work assesses the temporal distribution pattern and geochemical changes of rare earth elements and Yttrium, Scandium, Thorium, and Uranium delivery into the Oualidia lagoon. Two sediment cores were retrieved from the Oualidia lagoon and analyzed using neutron activation analysis. The results indicated that heavy rare earth elements are slightly enriched the sediment cores over light rare earth elements. The highest values of REEs were recorded in the top layers of the cores and depleted with depth, suggesting a possible change in factors controlling their accumulation, including mechanical, chemical, and environmental parameters such as weathering intensity, grain size, and Fe-Mn oxides. The sediments display positive Ce anomalies, which are probably related to the submarine weathering process and detrital input. Noting also the variation of hydrodynamics conditions and confinement of the upstream part of the lagoon played a key role in changing the sediment origins. Thus, further investigation of REEs origin in the Oualidia lagoon sediment is required to identify their sources, provenances, and the factors controlling their spatial and vertical distributions. However, these results provide baseline data of occurring changes in REEs geochemical composition and constitute a typical study case to understand the link between sedimentary and geochemistry processes in a lagoonal ecosystem.</p></div>","PeriodicalId":7151,"journal":{"name":"Acta Geochimica","volume":"42 6","pages":"1051 - 1064"},"PeriodicalIF":0.0,"publicationDate":"2023-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50042463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbon dioxide partial pressure and its diffusion flux in karst surface aquatic ecosystems: a review","authors":"Xingxing Cao,&nbsp;Qixin Wu,&nbsp;Wanfa Wang,&nbsp;Pan Wu","doi":"10.1007/s11631-023-00625-7","DOIUrl":"10.1007/s11631-023-00625-7","url":null,"abstract":"<div><p>Carbon dioxide (CO₂) emissions from aquatic ecosystems are an important component of the karst carbon cycle process and also a key indicator for assessing the effect of karst carbon sinks. This paper reviewed the CO₂ partial pressure (pCO₂) and its diffusion flux (FCO₂) in karst surface aquatic ecosystems, mainly rivers, lakes, and reservoirs, and their influencing factors summarized the methods for monitoring CO₂ emissions in karst aquatic ecosystems and discussed their adaptation conditions in karst areas. The pCO₂ and FCO₂ decreased in the order of rivers &gt; reservoirs &gt; lakes, and the values in karst lakes were eventually significantly lower than those in global lakes. The pCO₂ and FCO₂ of karst aquatic ecosystems had patterns of variation with diurnal, seasonal, water depth and hydrological cycles, and spatial and temporal heterogeneity. The sources of CO₂ in karst waters are influenced by both internal and external sources, and the key spatial and temporal factors affecting the CO₂ emissions from karst rivers, lakes, and reservoirs were determined in terms of physicochemical indicators, biological factors, and biogenic elements; additionally, the process of human activity interference on CO₂ emissions was discussed. Finally, a conceptual model illustrating the impacts of urban development, agriculture, mining, and dam construction on the CO₂ emissions at the karst surface aquatic ecosystem is presented. Meanwhile, based on the disadvantages existing in current research, we proposed several important research fields related to CO₂ emissions from karst surface aquatic ecosystems.</p></div>","PeriodicalId":7151,"journal":{"name":"Acta Geochimica","volume":"42 5","pages":"943 - 960"},"PeriodicalIF":0.0,"publicationDate":"2023-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50024402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Formation of FeNi metal nodules in the Jilin H5 chondrite, the largest stone meteorite in the world","authors":"Xiande Xie","doi":"10.1007/s11631-023-00627-5","DOIUrl":"10.1007/s11631-023-00627-5","url":null,"abstract":"<div><p>The Jilin H5 chondrite, the largest known stony meteorite in the world, with its No.1 fragment weighing 1770 kg. It contains submillimeter- to centimeter-sized FeNi metal particles/nodules. Our optical microscopic and electron microprobe analyses revealed that the formation of metal nodules in this meteorite is a complex and long-term process, The early stage is the thermal diffusion-caused migration and concentration of dispersed metallic material along fractures to form root-hair shaped metal grains during thermal metamorphism of this meteorite. The later two collision events experienced by this meteorite led to the further migration and aggregation of metallic material into the shock-produced cracks and openings to form larger-sized metal grains. The shock-produced shear movement and frictional heating occurred in this meteorite greatly enhanced the migration and aggregation of metallic material to form the large-sized nodules. It was revealed that the metal nodule formation process in the Jilin H5 chondrite might perform in the solid or subsolidus state, and neither melting of chondritic metal grains nor shock-induced vaporization of bulk chondrite material are related with this process.</p></div>","PeriodicalId":7151,"journal":{"name":"Acta Geochimica","volume":"42 6","pages":"961 - 970"},"PeriodicalIF":0.0,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11631-023-00627-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50009892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}