Chemical Geology最新文献

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Melt‑carbonate metasomatism in the Sulu orogen: Implications for CO2 release in the continental subduction zone 苏鲁造山带熔体碳酸盐交代作用：对大陆俯冲带CO2释放的影响

IF 3.9 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology

Pub Date : 2025-12-20 DOI: 10.1016/j.chemgeo.2025.123217

Shaoji Yang, Pan Wang, Haijin Xu, Fan Feng

引用次数: 0

Photochemistry of Fe (II) and carbonate-bearing waters and the influence on Greenhouse Gas production in Early Mars 早期火星含铁（II）和碳酸盐水的光化学及其对温室气体产生的影响

IF 3.9 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology

Pub Date : 2025-12-19 DOI: 10.1016/j.chemgeo.2025.123210

V.B. Rivera Banuchi, J. Gong, E.N. Mansbach, T. Bosak, J.A. Hurowitz

引用次数: 0

From bacterial to thermochemical sulfate reduction: Sulfur isotope constraints on the genesis of hyper-enriched black shales 从细菌到热化学硫酸盐还原：硫同位素对超富集黑色页岩成因的约束

IF 3.9 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology

Pub Date : 2025-12-19 DOI: 10.1016/j.chemgeo.2025.123207

Kyle M. Henderson, James R. Clark, Anthony E. Williams-Jones, Ryan Sharpe, Mostafa Fayek

引用次数: 0

A multi-isotope deconvolution approach to correct for hydride and xenon interferences during double spike barium isotope analyses with MC-ICP-MS MC-ICP-MS双尖峰钡同位素分析中氢化物和氙干扰的多同位素反褶积校正方法

IF 3.9 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology

Pub Date : 2025-12-18 DOI: 10.1016/j.chemgeo.2025.123209

Qasid Ahmad, Hongjie Zhang, Sune G. Nielsen

引用次数: 0

d88/86Sr and 87Sr/86Sr variability in fish otoliths: Implications for seawater temperature, growth-rate, and provenance 鱼类耳石中的d88/86Sr和87Sr/86Sr变率：对海水温度、生长速率和物源的影响

IF 3.9 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology

Pub Date : 2025-12-18 DOI: 10.1016/j.chemgeo.2025.123208

Arka Chakraborty, Sourav Ganguly, Arild Folkvord, Steven E. Campana, Prosenjit Ghosh, Ramananda Chakrabarti

引用次数: 0

The predominance of SiO5 species in MgSiO3 melt at transition zone pressures from a dynamics point of view 从动力学的角度来看，MgSiO3中SiO5物质的优势在过渡区压力下熔化

IF 3.9 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology

Pub Date : 2025-12-17 DOI: 10.1016/j.chemgeo.2025.123194

Georg Spiekermann, Maximilian Schulze

引用次数: 0

Epidote emerges as a pivotal player in the hydration dynamics of the mantle transition zone 绿帘石在地幔过渡带水化动力学中起着举足轻重的作用

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology

Pub Date : 2025-12-16 DOI: 10.1016/j.chemgeo.2025.123206

Jing Gao , Xueyin Yuan , Xinyang Li , Chaowen Xu , Yue Wang , Wanghua Wu

Geophysical data has revealed anomalous water enrichment in the mantle transition zone (MTZ, 410–660 km depths), which is widely attributed to crustal water released from stagnant subducted slabs. However, the majority of hydrous minerals dehydrate completely at depths <∼300 km, leaving the mechanism of water transport to the deeper mantle unresolved. The discovery of ‘epidote-phases’ in superdeep diamonds from the MTZ offers a potential solution, yet critical uncertainties persist regarding its stability under subduction-zone thermal gradients and MTZ conditions. This study experimentally demonstrates that the hydroxyl groups in epidote strengthen along cold-to-hot subduction geotherms (5–25 °C/km) across ∼250 km. In the deeper reduced mantle (buffered by FeO-Fe), epidote undergoes complete dehydration at ∼250 km via decomposition into grossular, andradite and wustite. Yet, kinetic barriers and the limited extent of reduced domains within slabs probably inhibit this process. Under oxidized conditions (Fe₂O₃-Fe₃O₄ buffer), epidote destabilizes at thermally perturbed slab interfaces, and is more likely to decompose via prolonged mantle-derived heating in the MTZ. This breakdown partially traps water in the newly formed grossular garnet. These findings redefine epidote as a dynamic agent in the hydration of the MTZ, offering a novel mineralogical perspective on the water-rich characteristics of this enigmatic region.

地球物理资料显示，地幔过渡带（MTZ，深度410-660 km）异常富集水，这被广泛认为是由停滞俯冲板块释放的地壳水所致。然而，大多数含水矿物在深度<； ~ 300 km处完全脱水，使得水输送到更深地幔的机制尚未解决。在MTZ的超深钻石中发现“绿帘石相”提供了一个潜在的解决方案，但其在俯冲带热梯度和MTZ条件下的稳定性仍然存在关键的不确定性。该研究通过实验证明，绿帘石中的羟基沿着冷-热俯冲地热（5-25°C/km）在约250公里的范围内加强。在较深的还原地幔（由FeO-Fe缓冲）中，绿帘石在~ 250 km处通过分解成粗晶、安长石和浮士岩而完全脱水。然而，动力障碍和板内有限的还原域可能抑制了这一过程。在氧化条件下（Fe2O3-Fe3O4缓冲），绿帘石在热扰动板界面处不稳定，并且更有可能通过长时间的地幔衍生加热在MTZ中分解。这种分解部分地将水困在新形成的粗晶石榴石中。这些发现重新定义了绿帘石在MTZ水化中的动态作用，为这个神秘地区的富水特征提供了新的矿物学视角。

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引用次数: 0

Mineralization of bacterial cells during proto-dolomite precipitation mediated by the halophilic bacteria Bacillus licheniformis 嗜盐细菌地衣芽孢杆菌介导的原生白云岩沉淀过程中细菌细胞的矿化

IF 3.9 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology

Pub Date : 2025-12-13 DOI: 10.1016/j.chemgeo.2025.123205

Ruirui Meng, Zuozhen Han, Wen Nie, Chao Han, Yu Han, Maurice E. Tucker

Previous studies have demonstrated that bacteria can induce proto-dolomite precipitation at ambient temperatures. Yet, the mineralization of the bacteria during this process has rarely been reported. Here we describe mineralized bacteria formed during proto-dolomite precipitation mediated by the moderate halophilic bacteria Bacillus licheniformis Y1. The XRD data and SEM images show that proto-dolomite precipitated mainly as aggregates in media with Mg/Ca ratios of 6, 8 and 10 cultured at temperatures of 30 °C and 40 °C, but this was not observed in solutions cultured at 20 °C. Solution chemistry analysis showed that all solutions maintained a higher CO32− concentration and correspondingly higher saturation indices for proto-dolomite at 40 °C. The HRTEM results illustrate that the crystal structures and Mg/Ca atomic ratio of the proto-dolomite more closely match those of dolomite, and some superstructure reflections appear in the HRTEM and SAED images. These features indicate that a few crystal units of proto-dolomite may have been formed with some degree of cation ordering. The SED/EDS and HRTEM images also demonstrate that the bacteria are mineralized and form proto-dolomite crusts. The HTREM analyses of bacterial ultrathin slices show that the proto-dolomite crystals formed within cells, on the cell surface and within EPS. We assume that during biomineralization, Ca2+ and Mg2+ ions are trapped by the negatively charged EPS and transferred into the cells through diffusion, leading to the extracellular and intracellular precipitation of proto-dolomite; the bacteria themselves are mineralized during the constant formation of proto-dolomite crystals within and upon the surface of the cells. This study provides insights into our understanding of the formation of biotic proto-dolomite, and contributes to the origin of “microbial dolomite”.

先前的研究表明，细菌可以在环境温度下诱导原白云岩沉淀。然而，在这一过程中细菌的矿化很少有报道。在这里，我们描述了矿化细菌形成于原生白云岩沉淀由中等嗜盐细菌地衣芽孢杆菌Y1介导。XRD数据和SEM图像显示，在30 °C和40 °C培养的Mg/Ca比为6、8和10的培养基中，原白云石主要以聚集体的形式析出，而在20 °C培养的溶液中则没有这种现象。溶液化学分析表明，在40 °C时，所有溶液均保持较高的CO32−浓度和相应的较高饱和度指数。HRTEM结果表明，原白云岩的晶体结构和Mg/Ca原子比与白云岩更接近，在HRTEM和SAED图像中出现了一些上层建筑反射。这些特征表明，原白云岩可能形成了一些具有一定正离子顺序的晶体单元。SED/EDS和HRTEM图像也表明细菌矿化并形成原白云岩结壳。细菌超薄切片的HTREM分析表明，原白云石晶体在细胞内、细胞表面和EPS内形成。我们认为，在生物矿化过程中，Ca2+和Mg2+离子被带负电荷的EPS捕获并通过扩散转移到细胞中，导致原白云岩的胞外和胞内沉淀；在细胞内部和表面不断形成原白云石晶体的过程中，细菌本身被矿化了。该研究为我们对生物原生白云岩形成的认识提供了新的思路，为“微生物白云岩”的起源提供了新的思路。

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引用次数: 0

Proterozoic highly siderophile element enrichment of the Kaapvaal cratonic Archean mantle Kaapvaal克拉通太古宙地幔元古代高度亲铁元素富集

IF 3.9 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology

Pub Date : 2025-12-13 DOI: 10.1016/j.chemgeo.2025.123201

Nadine P. Cooper, D. Graham Pearson, Andreas Auer, Tristan Bongartz, Yannick Bussweiler, Mario Fischer-Gödde, Max Hellers, Geoffrey Howarth, Andrew J. Locock, Ambre Luguet, Carsten Münker, Thomas Stachel, Ashlea N. Wainwright, Sarah Woodland, James M. Scott

引用次数: 0

Deciphering chemical complexity in monogenetic eruptions: Xitle Volcano, Mexico 破译单基因喷发中的化学复杂性：墨西哥的西特尔火山

IF 3.9 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology

Pub Date : 2025-12-12 DOI: 10.1016/j.chemgeo.2025.123204

J. Ahmadi, E. Widom, M.-N. Guilbaud, C. Siebe, D.C. Kuentz, R. Sanchez, M. Medina-Jaen, J.J. Zamorano-Orozco, S.M. Straub

引用次数: 0

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