Geochemical Perspectives Letters最新文献

Barium isotope evidence for a magmatic fluid-dominated petrogenesis of LCT-type pegmatites 以岩浆流体为主的岩浆岩成岩作用的钡同位素证据

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-06-28 DOI: 10.7185/geochemlet.2426

G. Deng, D. Jiang, G. Li, Z. Xu, F. Huang

引用次数: 0

Subduction of sedimentary carbonate in the Mariana trench 马里亚纳海沟沉积碳酸盐的俯冲作用

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-06-26 DOI: 10.7185/geochemlet.2425

S. Liu, X. Su, S. Wan, L. Zhang, S. Chen, W. Xu, H. Xu, D. Wang, D. Li, X. Peng

{"title":"Subduction of sedimentary carbonate in the Mariana trench","authors":"S. Liu, X. Su, S. Wan, L. Zhang, S. Chen, W. Xu, H. Xu, D. Wang, D. Li, X. Peng","doi":"10.7185/geochemlet.2425","DOIUrl":"https://doi.org/10.7185/geochemlet.2425","url":null,"abstract":"Calcium carbonate is a major component of shallow marine sediments but is rarely preserved in deep sea environments below the calcite compensation depth (CCD). In this study, we present evidence of sedimentary carbonate on the subducting Pacific plate of the Mariana Trench at a water depth ranging from 6675 to 10,813 m, far surpassing the local CCD of 4800 m. These deposits consist of well-preserved calcareous nannofossils, planktonic foraminifera, and siliceous radiolarians. Fossil assemblages and isotope stratigraphy analyses constrain the age of carbonate sediments to 17.6–13.5 Ma. We propose that the calcareous sediments originated from rapid deposition and burial on the seafloor above the CCD during the Miocene. Subsequently, they were transported into the hadal zone with the subduction of the Pacific Plate and exposed due to the excavation of extensive subducting-related normal faults within the subducting plate. This study implies that sedimentary carbonate may be a key component of subducting carbon at the hadal subduction zones, which has important implications for evaluating global carbon input fluxes at these zones.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":"15 1","pages":""},"PeriodicalIF":4.9,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507838","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 “Sulfur solubility in a deep magma ocean and implications for the deep sulfur cycle” by Steenstra et al., 2022. 对 Steenstra 等人所著 "深岩浆海洋中的硫溶解度及其对深层硫循环的影响 "的更正，2022 年。

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-06-25 DOI: 10.7185/geochemlet.2219cor

E.S. Steenstra, O.T. Lord, S. Vitale, E.S. Bullock, S. Klemme, M. Walter

引用次数: 0

A baseline for the Sn isotopic composition of the upper continental crust 大陆上地壳锡同位素组成基线

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-05-30 DOI: 10.7185/geochemlet.2422

E. Kubik, F. Moynier, J.-X. She, R.L. Rudnick

{"title":"A baseline for the Sn isotopic composition of the upper continental crust","authors":"E. Kubik, F. Moynier, J.-X. She, R.L. Rudnick","doi":"10.7185/geochemlet.2422","DOIUrl":"https://doi.org/10.7185/geochemlet.2422","url":null,"abstract":"We report high precision Sn isotopic compositions, expressed as δ122/118Sn relative to the NIST3161a standard, for the fine grained matrix of 24 glacial diamictite composites. The diamictites were deposited from the Mesoarchean to the Palaeozoic and sampled from four continents (Africa, Asia, North and South America). They are relatively homogeneous in δ122/118Sn, ranging from 0.15 to 0.32 ‰ with an average δ122/118Sn value of 0.22 ± 0.14 ‰ (2 s.d., n = 24). The Sn isotopic composition of the diamictites is not influenced by chemical weathering, depositional age, geographic setting, atmospheric oxygen content or magmatic differentiation processes in the source region. As such, the average provides a robust estimate of the Sn isotopic composition of the bulk upper continental crust (UCC). This baseline is within the range of, but isotopically lighter than, the current depleted mantle estimate (0.37 ± 0.09 ‰; 2 s.d., n = 12) and bulk silicate Earth (0.38 ± 0.11 ‰; 2 s.d., n = 9). It also overlaps with the very few available measurements made on andesites, granites, a granodiorite and a rhyolite.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":"51 1","pages":""},"PeriodicalIF":4.9,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141190530","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

Neoarchean marine chemical sediments as archives of Hadean silicate differentiation 新元古代海洋化学沉积物作为哈代硅酸盐分化的档案

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-05-30 DOI: 10.7185/geochemlet.2421

A.N. Wainwright, V. Debaille, J.E. Hoffmann, S. Viehmann, M. Bau

{"title":"Neoarchean marine chemical sediments as archives of Hadean silicate differentiation","authors":"A.N. Wainwright, V. Debaille, J.E. Hoffmann, S. Viehmann, M. Bau","doi":"10.7185/geochemlet.2421","DOIUrl":"https://doi.org/10.7185/geochemlet.2421","url":null,"abstract":"Planetary differentiation had a profound influence on the geochemical signature of the Earth’s silicate reservoirs. Some of the early created complementary reservoirs dissipated with time (e.g., Bennett et al., 2007Bennett, V.C., Brandon, A.D., Nutman, A.P. (2007) Coupled 142Nd-143Nd Isotopic Evidence for Hadean Mantle Dynamics. Science 318, 1907–1910. https://doi.org/10.1126/science.1145928) and only remnants can be observed. Here, we apply the short lived isotopic system 146Sm-142Nd to an alternative archive—marine chemical sediments—and show that alternating Fe- and Si-rich bands from the 2.7 billion-year-old Temagami banded iron formation (BIF), Canada, display significantly different 142Nd isotopic compositions. The Fe-rich bands yield a depleted signature (expressed as deviation from the standard in μ notation) with an average μ142Nd of +7.02 ± 0.71, while the Si-rich bands display modern mantle-like signatures (average μ142Nd −2.83 ± 2.32) likely being the results of mixing between different sources. These complementary signatures reflect the dominant, locally derived source of Nd in the seawater at the time of deposition. Our results promote that layering in BIFs is a syn-depositional feature, and that BIFs are unique geochemical archives capable of recording silicate reservoirs that formed during the Hadean but were still extant during the Neoarchean.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":"21 1","pages":""},"PeriodicalIF":4.9,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141190543","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

Lanthanum anomalies provide constraints on macrofaunal predation at methane seeps 镧异常为甲烷渗漏区大型底栖生物捕食提供了制约因素

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-05-28 DOI: 10.7185/geochemlet.2420

X. Wang, Z. Jia, J. Peckmann, S. Kiel, J.-A. Barrat, G. Bayon, J. Li, L. Yin, T. Wei, Q. Liang, D. Feng

{"title":"Lanthanum anomalies provide constraints on macrofaunal predation at methane seeps","authors":"X. Wang, Z. Jia, J. Peckmann, S. Kiel, J.-A. Barrat, G. Bayon, J. Li, L. Yin, T. Wei, Q. Liang, D. Feng","doi":"10.7185/geochemlet.2420","DOIUrl":"https://doi.org/10.7185/geochemlet.2420","url":null,"abstract":"The feeding habits and predation behaviour of organisms can exert significant control on the dynamics of local food webs. Yet, little is known about the effects of predation on the material and trophic transfer dynamics in chemosynthesis-based ecosystems. Here, we investigated the rare earth element (REE) composition of soft tissues and hardparts for thiotrophy-dependent vesicomyid clams (Archivesica marissinica), aerobic methanotrophy-dependent bathymodiolin mussels (Gigantidas haimaensis), in addition to turrid gastropods (Phymorhynchus buccinoides) and parasitic scale worms (Branchipolynoe pettiboneae) from the Haima seeps of the South China Sea; the latter two species are predators feeding on mussels. Our goal was to determine if the specific, microbially-derived, light REE enrichment characteristics of seep mussels can be transferred to the biomass of their predators. The vesicomyid clams were found to exhibit light REE patterns similar to that of seawater. In contrast, the bathymodiolin mussels, turrid gastropods, and scale worms revealed pronounced lanthanum (La) enrichment, agreeing with substantial transfer of La within the local food web. The observed enrichment of La in seep dwelling predators represents an independent method for monitoring the dynamics within seep ecosystems and potentially for assessing faunal interactions in ancient chemosynthesis-based ecosystems.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":"21 1","pages":""},"PeriodicalIF":4.9,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141169446","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

Correlative microspectroscopy of biogenic fabrics in Proterozoic silicified stromatolites 新生代硅化叠层石中生物结构的相关微谱分析

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-05-13 DOI: 10.7185/geochemlet.2419

K. Hickman-Lewis, B. Cavalazzi, W. Montgomery

{"title":"Correlative microspectroscopy of biogenic fabrics in Proterozoic silicified stromatolites","authors":"K. Hickman-Lewis, B. Cavalazzi, W. Montgomery","doi":"10.7185/geochemlet.2419","DOIUrl":"https://doi.org/10.7185/geochemlet.2419","url":null,"abstract":"Questions surrounding the biogenicity of ancient stromatolites have perplexed geobiologists for decades. Abiotic processes can produce superficially stromatolite-like structures; moreover, stromatolites frequently fail to preserve organic materials and cellular traces of their microbial architects. Using spatially correlated optical and electron microscopy coupled with Raman and FTIR microspectroscopy, we show that silicified stromatolites from the Tonian Skillogalee Dolomite (Flinders Ranges, South Australia) contain exceptionally well preserved microbial mat fragments and microbially induced sedimentary structures. These organic-rich layers exhibit mat-like laminations with low degrees of inheritance and reflect interactions between microbial communities and their environments, i.e. growth, sediment trapping and binding, and reactions to early diagenesis, and are inconsistent with abiotic formation. Although accounting for a minor proportion of the volume of the stromatolites, these kerogenous relics are demonstrably syngenetic and comprise aromatic and aliphatic organic materials, likely preserved due to early and rapid silicification. Constraining the origins of such lamination-scale features can elucidate relationships between morphogenesis and diagenesis and may assist in the resolution of controversies surrounding stromatolite biogenicity in deep time.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":"67 1","pages":""},"PeriodicalIF":4.9,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140929504","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

Variable δ11B signatures reflect dynamic evolution of the Mariana serpentinite forearc 不同的δ11B特征反映了马里亚纳蛇绿岩前弧的动态演化

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-05-03 DOI: 10.7185/geochemlet.2416

E. Cannaò, B. Debret

引用次数: 0

A two stage impact melting process in an impact glass strewn field from the Atacama Desert 阿塔卡马沙漠撞击玻璃散落区的两阶段撞击熔化过程

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-05-03 DOI: 10.7185/geochemlet.2418

P. Rochette, G. Di Vincenzo, J. Gattacceca, J.A. Barrat, B. Devouard, L. Folco, A. Musolino, Y. Quesnel

引用次数: 0

Direct precipitation of siderite in ferruginous environments 铁矿环境中菱铁矿的直接沉淀

IF 4.9 1区地球科学

Geochemical Perspectives Letters Pub Date : 2024-04-30 DOI: 10.7185/geochemlet.2414

A. Grengs, G. Ledesma, Y. Xiong, S. Katsev, S.W. Poulton, E.D. Swanner, C. Wittkop

{"title":"Direct precipitation of siderite in ferruginous environments","authors":"A. Grengs, G. Ledesma, Y. Xiong, S. Katsev, S.W. Poulton, E.D. Swanner, C. Wittkop","doi":"10.7185/geochemlet.2414","DOIUrl":"https://doi.org/10.7185/geochemlet.2414","url":null,"abstract":"Siderite (FeCO3) is often assumed to precipitate from dissimilatory reduction of Fe-(oxyhydr)oxides, but geochemical and mineralogical analyses from ferruginous (anoxic, Fe-rich) Canyon Lake, USA, suggest Fe-carbonate represents a direct early precipitate unrelated to substantial oxide burial. X-ray absorption near edge structure (XANES) spectroscopy of sediment trap materials and an anoxic sediment core indicated a mixture of Fe(II) and Fe(III) in water column particulates and ferruginous surface sediments, while all Mn phases were reduced. About 60 cm below the sediment–water interface, Fe-Mn carbonates were detected by X-ray diffraction and XANES, while Fe extended X-ray absorption fine structure (EXAFS) spectra were best fit with combinations of a biogenic Fe-oxyhydroxide (“Bio Fe”), greigite, and siderite. Sediment Fe speciation indicates a large pool of reduced Fe with a minor component of oxides. Although we found no evidence of significant carbonate phases above or below the 60 cm horizon, equilibrium modelling indicates siderite supersaturation throughout surface sediment porewater, with pH as the primary control on supersaturation. We conclude that delivery of wildfire ash to sediments increased pH, initiating siderite precipitation from ferruginous porewater.","PeriodicalId":12613,"journal":{"name":"Geochemical Perspectives Letters","volume":"36 1","pages":""},"PeriodicalIF":4.9,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140835689","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