Geobiology最新文献

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":173,"journal":{"name":"Geobiology","volume":"24 3","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148097828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":173,"journal":{"name":"Geobiology","volume":"24 3","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148098967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":173,"journal":{"name":"Geobiology","volume":"24 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148088200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":173,"journal":{"name":"Geobiology","volume":"24 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148086311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tricks of Nature From the Ancient Earth and Early Mars: Chemical Gardens Generate Biomorphs With High Preservation Potential.","authors":"Solomon Hirsch, Sean McMahon, Jens Najorka, Mark A Sephton","doi":"10.1111/gbi.70045","DOIUrl":"10.1111/gbi.70045","url":null,"abstract":"<p><p>Observations of morphology are commonly used to evaluate the biogenicity of terrestrial microfossils and could constitute a crucial line of evidence for extraterrestrial life-detection missions in the future. However, evaluating the origin of morphological features in the rock record can be problematic because naturally occurring abiotic structures can resemble biological morphologies, which may lead to false-positive detections of fossilised life. Iron-mineralised chemical gardens have been highlighted as potentially confounding abiotic structures because of their morphological and chemical resemblance to biomineralised filaments. Despite this, the potential for chemical garden structures to be preserved in the fossil record has not been thoroughly investigated. Here, we subjected abiotic iron-mineralised chemical garden structures to artificial maturation using hydrous pyrolysis, in order to evaluate their preservation potential. We found that these abiotic filaments were relatively resistant to degradation caused by maturation when compared with analogous biological material. Additionally, the transformation of ferrihydrite to crystalline iron oxides was found to be relatively inhibited, likely because of the influence of silica. These findings highlight the need for fossilised filamentous material to be distinguished from chemical garden structures before a biological origin can be confidently attributed, particularly when observed in significantly altered rocks.</p>","PeriodicalId":173,"journal":{"name":"Geobiology","volume":"24 2","pages":"e70045"},"PeriodicalIF":2.7,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13100049/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147758297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Correction to “On the Trail of Iron Uptake in Ancestral Cyanobacteria on Early Earth”","authors":"","doi":"10.1111/gbi.70043","DOIUrl":"10.1111/gbi.70043","url":null,"abstract":"<p>Enzingmüller-Bleyl, T. C., J. S. Boden, A. J. Herrmann, K. W. Ebel, P. Sánchez-Baracaldo, N. Frankenberg-Dinkel, and M. M. Gehringer. 2022. “On the Trail of Iron Uptake in Ancestral Cyanobacteria on Early Earth.” <i>Geobiology</i> 20: 776–789. https://doi.org/10.1111/gbi.12515.</p><p>We apologize for this error.</p>","PeriodicalId":173,"journal":{"name":"Geobiology","volume":"24 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/gbi.70043","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146117108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Phytochemical Screening of 45-Million-Year-Old Colored Angiosperm Leaves Reveals Distinctive Chlorophyll-Derived and Polyphenolic Pigments","authors":"Klaus Wolkenstein,&nbsp;Christa E. Müller,&nbsp;Marianne Engeser,&nbsp;Holm Frauendorf,&nbsp;Victoria E. McCoy,&nbsp;Carole T. Gee","doi":"10.1111/gbi.70042","DOIUrl":"10.1111/gbi.70042","url":null,"abstract":"<p>Present-day angiosperm plants produce a plethora of metabolites including pigments that serve for important functions such as photosynthesis, protection against light, attraction of pollinators, and defense against microbes and herbivores. However, little is known about phytochemical constituents of ancient angiosperms, their distribution in the fossil record, their stability in deep time, and diagenesis. Outstanding preservation of ancient angiosperms, including exceptional color preservation, has been reported, but chemical analyses of such valuable specimens are limited by the rarity of the fossil material and the small amounts of potentially preserved metabolites. Here we use highly sensitive targeted liquid chromatography–tandem mass spectrometry in multiple reaction monitoring mode to screen for nanogram quantities of intact ancient phytochemical metabolites and their products in exceptionally well-preserved, about 45-Ma-old leaves from the Eocene Geiseltal fossil Lagerstätte, Germany. We show that diverse chlorophyll derivatives and degradation products as well as polyphenolic pigments are preserved in green to yellow colored angiosperm leaves and the brown coal matrix from Geiseltal. Most interesting is the fossil occurrence of the “unstable” green chlorophyll derivative dihydro-13²,17³-cyclopheophorbide <i>a</i>-enol, since cyclopheophorbide-enols are otherwise known as unique non-fluorescent chlorophyll catabolites of microorganisms in modern aquatic environments. The monopyrrole hematinic acid is interpreted as a stable product of chlorophyll catabolism via linear tetrapyrroles. Moreover, polyphenolic compounds in the fossil angiosperms are represented by the flavonoid pigments apigenin and luteolin. Our results demonstrate the potential of paleometabolomic-like screening of individual plant fossils to trace the fate of phytochemical constituents and to understand the processes of fossilization at the molecular level.</p>","PeriodicalId":173,"journal":{"name":"Geobiology","volume":"24 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12860425/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146091734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Localized and Transient Oxygenation of Shallow Oceans of Southwestern Laurentia at the Ediacaran–Cambrian Boundary","authors":"Watsawan Chanchai,&nbsp;Lyle L. Nelson,&nbsp;Emily F. Smith,&nbsp;Dalton S. Hardisty,&nbsp;Mary C. Lonsdale,&nbsp;Janet E. Burke,&nbsp;Kimberly V. Lau","doi":"10.1111/gbi.70039","DOIUrl":"10.1111/gbi.70039","url":null,"abstract":"<p>The Ediacaran–Cambrian boundary, which precedes one of the most significant biotic diversification events in Earth's history, is associated with a global negative carbon isotope excursion termed the BAsal Cambrian carbon isotope Excursion (BACE). Late Ediacaran and early Cambrian changes in shallow marine oxygenation have been proposed to relate to the BACE as well as metazoan extinction and radiation. However, reconstructing paleoredox conditions at the Ediacaran–Cambrian boundary is limited by challenges in correlating carbonate strata due to sparse stratigraphic markers and non-unique chemostratigraphic correlations. These imprecise correlations have led to uncertainty in how redox changes across the BACE should be interpreted in relation to broader regional and global environmental patterns. Here, we present redox reconstructions from southwestern Laurentian carbonate successions that record the BACE, including the limestone-dominated Deep Spring Formation, southwestern USA, and the dolostone-dominated La Ciénega Formation, northern Mexico. We combine local (carbonate-bound iodine, I/(Ca + Mg) and cerium anomaly, Ce/Ce*) and global (carbonate-associated uranium isotopes, δ²³⁸U_carb) redox proxies to investigate marine oxygenation in relation to the BACE. Contrary to previous suggestions that a global ocean oxygenation event coincided with the BACE, we do not observe a shift in δ²³⁸U_carb concurrent with the carbon isotope excursion in either section. The δ²³⁸U_carb values differ between two sections, likely reflecting distinct diagenetic offsets attributed to different diagenetic U reduction, but together provide a minimal constraint on the carbonate δ²³⁸U value and suggest a more anoxic ocean compared to today. The local proxy results at both sites suggest widespread low-oxygen surface waters with a transient and localized interval of shallow marine oxygenation at one site that coincides with the nadir of the BACE. Persistently low I/(Ca + Mg) ratios, below values observed in today's oxygenated oceans, suggest a broadly redox-stratified surface ocean. Negative Ce anomalies in the La Ciénega Formation were recorded during the BACE nadir, suggesting a short-lived interval of local oxygenation within otherwise low-oxygen conditions. In sum, we do not find evidence for major, widespread oxygenation coincident with the BACE, but a continuation of low-oxygen conditions punctuated by a short-lived oxygenation event in the shallow oceans. These brief fluctuations in oxygen levels, in turn, may have played a role in the onset of behavioral complexity among bilaterian invertebrates during this critical transition.</p>","PeriodicalId":173,"journal":{"name":"Geobiology","volume":"24 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12754582/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145861355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Redox Dynamics of the Atmosphere and Oceans Induced by the Paleoproterozoic Snowball Earth Events","authors":"Mariko Harada,&nbsp;Yuna Miura,&nbsp;Yasuto Watanabe,&nbsp;Kazumi Ozaki","doi":"10.1111/gbi.70040","DOIUrl":"10.1111/gbi.70040","url":null,"abstract":"<p>The Paleoproterozoic Earth underwent profound environmental changes, including multiple severe glaciations and fluctuations in atmospheric oxygen (O₂) levels. However, the precise relationship between O₂ evolution and the glaciations remains unclear. Here, we use a biogeochemical cycle model involving carbon, phosphorus, sulfur, and oxygen to investigate the redox dynamics of the ocean—atmosphere system following the climatic transition to a super-greenhouse state after deglaciation. Our stochastic analysis reveals that climatic recovery on a timescale of ~10⁵ years from elevated atmospheric CO₂ levels (&gt; 0.2 atm) triggers an extensive oxidation of the atmosphere and oceans over the subsequent 10⁶–10⁷ years, aligning with the large sulfur isotope anomaly in buried pyrite after the third Paleoproterozoic glaciation (~2.3 Ga). This finding suggests that the third glaciation represented an extensively glaciated, snowball state, which would have required massive accumulation of atmospheric CO₂ for deglaciation. Variation in the boundary conditions regarding the global redox budget, as represented by high reductant fluxes, may explain the return of atmospheric O₂ to Archean-like levels following the first (Makganyene) glaciation, which is also considered a snowball Earth.</p>","PeriodicalId":173,"journal":{"name":"Geobiology","volume":"23 6","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12743051/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145843209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"A Comprehensive Study of Biohopanoid Production in Alphaproteobacteria: Biosynthetic, Chemotaxonomical, and Geobiological Implications","authors":"Jaap S. Sinninghe Damsté,&nbsp;Michel Koenen,&nbsp;Vera Thiel,&nbsp;Nora Richter,&nbsp;Ellen C. Hopmans,&nbsp;Nicole J. Bale","doi":"10.1111/gbi.70038","DOIUrl":"10.1111/gbi.70038","url":null,"abstract":"&lt;p&gt;Bacteriohopanepolyol derivatives (BHPDs) and dia- and catagenetic products formed from these bacterial membrane modifiers are extensively used as biomarkers in molecular ecological and geoscience studies. Some BHPDs can be assigned to specific phylogenetic bacterial groups. With the vastly increasing availability of complete bacterial genomes, hopanoid production can be readily predicted by the presence of specific genes encoding biosynthetic enzymes involved in their production, but the time-consuming physiological confirmation remains a critical element in the interpretation of such data in a biosynthetic and paleontological context. &lt;i&gt;Alphaproteobacteria&lt;/i&gt; (APB) have often been proposed as important BHPD producers in a wide variety of environments and produce indicative BHPDs containing an additional methyl group in the A-ring, complicating the assignment of 2-methyl hopanes to N&lt;sub&gt;2&lt;/sub&gt;-fixing cyanobacteria in paleontological studies. Here we provide the first comprehensive study of the relationship between genotype and phenotype with respect to the production of C&lt;sub&gt;30&lt;/sub&gt; hopanoids and BHPDs by APB. Genome analysis of &gt; 6000 reference genomes of APB revealed that ca. 23% possess the genetic capacity to produce BHPDs, which is substantially higher than for all bacteria. However, BHPD biosynthesis genes were unevenly distributed between taxonomic and phylogenetic groups and not consistently found in mono-phylogenetic clusters. To study the relationship of genotype and phenotype with respect to the production of BHPDs, we cultivated 52 strains (50 terrestrial and 2 marine species) of the three major orders of the APB: &lt;i&gt;Hyphomicrobiales&lt;/i&gt;, &lt;i&gt;Rhodospirillales&lt;/i&gt;, and &lt;i&gt;Sphingomonadales&lt;/i&gt;. These include species of 29 genera that have not previously been examined for BHPDs. Intact BHPDs were analyzed by UHPLC-MS&lt;sup&gt;n&lt;/sup&gt;, resulting in the identification of overall 63 different structures and a wide variety in BHPD distributions. These results were in line with those obtained from Rohmer degradation on intact cells, which were specifically used to accurately assess the degree of methylation at C-2 and C-3 of ring A of the BHPDs. This revealed a 1–2 orders of magnitude lower degree of methylation at C-2 of BHPDs than for tetrahymanol (which was detected in three species all belonging to the &lt;i&gt;Nitrobacteraceae&lt;/i&gt;) and C&lt;sub&gt;30&lt;/sub&gt; hopanoids, which has important implications for the interpretation of the molecular fossil record. Our results also showed that the presence of BHPD biosynthetic genes, often organized in a biosynthetic gene cluster, in all cases results in actual production of BHPDs. Thus, the presence of BHPD genes is a good predictor for the actual production of BHPDs. However, the presence of genes encoding proteins that result in methylation at C-2 and C-3 of BHPDs does not always lead to the production of methylated BHPDs, complicating the interpretation of the presence of the &lt;i&gt;hpnP&lt;/i&gt; and &lt;i&gt;hpnR&lt;/","PeriodicalId":173,"journal":{"name":"Geobiology","volume":"23 6","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12583986/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145436690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}