Formation of large carbonate concretions in black cherts in the Gufeng Formation (Guadalupian) at Enshi, South China.

abstract：:The ability of micro-organisms to oxidize manganese (Mn) from Mn(II) to Mn(III/IV) oxides transcends boundaries of biological clade or domain. Many bacteria and fungi oxidize Mn(II) to Mn(III/IV) oxides directly through enzymatic activity or indirectly through the production of reactive oxygen species. Here, we determ...

journal_title：Geobiology

authors： Sutherland KM,Wankel SD,Hansel CM

更新日期：2018-07-01 00:00:00

abstract：:Microfossils belonging to the 1.88-billion-year-old 'Gunflint-biota' are preserved as carbonaceous and hematitic filaments and spheres that are believed to represent ancient chemolithoautotrophic Fe(II) oxidizing bacteria that grew above a chemocline where ferruginous seawater upwelled into shallow, oxygenated waters....

journal_title：Geobiology

authors： Shapiro RS,Konhauser KO

更新日期：2015-05-01 00:00:00

abstract：:In the aftermath of the end-Permian mass extinction, Early Triassic sediments record some of the largest Phanerozoic carbon isotopic excursions. Among them, a global Smithian-negative carbonate carbon isotope excursion has been identified, followed by an abrupt increase across the Smithian-Spathian boundary (SSB; ~250...

journal_title：Geobiology

authors： Thomazo C,Vennin E,Brayard A,Bour I,Mathieu O,Elmeknassi S,Olivier N,Escarguel G,Bylund KG,Jenks J,Stephen DA,Fara E

更新日期：2016-05-01 00:00:00

abstract：:Microbial fossils and textures are commonly preserved in Ediacaran and early Cambrian coarse-grained siliciclastic sediments that were deposited in tidal and intertidal marine settings. In contrast, the fossilization of micro-organisms in similar marine environments of post-Cambrian age is less frequently reported. Th...

journal_title：Geobiology

authors： Newman SA,Klepac-Ceraj V,Mariotti G,Pruss SB,Watson N,Bosak T

更新日期：2017-07-01 00:00:00

abstract：:Mixing of sediments by moving animals becomes apparent in the trace fossil record from about 550 million years ago (Ma), loosely overlapping with the tail end of the extreme carbonate carbon isotope δ13 Ccarbonate fluctuations that qualitatively distinguish the Proterozoic geochemical record from that of the Phanerozo...

journal_title：Geobiology

authors： Boyle RA,Dahl TW,Bjerrum CJ,Canfield DE

更新日期：2018-05-01 00:00:00

abstract：:Ocean acidification by atmospheric carbon dioxide has increased almost continuously since the last glacial maximum (LGM), 21,000 years ago. It is expected to impair tropical reef development, but effects on reefs at the present day and in the recent past have proved difficult to evaluate. We present evidence that acid...

journal_title：Geobiology

authors： Riding R,Liang L,Braga JC

更新日期：2014-09-01 00:00:00

abstract：:In aquatic habitats, micro-organisms successfully adhere to and mediate particles, thus changing the erosive response of fine sediments to hydrodynamic forcing by secreting glue-like extracellular polymeric substances (EPS). Because sediment dynamics is vital for many ecological and economic aspects of watersheds and ...

journal_title：Geobiology

authors： Gerbersdorf SU,Wieprecht S

更新日期：2015-01-01 00:00:00

abstract：:Zodletone spring in Oklahoma is a unique environment with high concentrations of dissolved-sulfide (10 mm) and short-chain gaseous alkanes, exhibiting characteristics that are reminiscent of conditions that are thought to have existed in Earth's history, in particular the late Archean and early-to-mid Proterozoic. Her...

journal_title：Geobiology

authors： Bühring SI,Sievert SM,Jonkers HM,Ertefai T,Elshahed MS,Krumholz LR,Hinrichs KU

更新日期：2011-03-01 00:00:00

abstract：:Through the use of scanning transmission electron microscopy (STEM) combined with other complementary techniques (SEM, cryo-TEM, HRTEM, and EELS), we have studied the interaction of microorganisms inhabiting deep anoxic waters of acidic pit lakes with dissolved aluminum, silica, sulfate, and ferrous iron. These elemen...

journal_title：Geobiology

authors： Sánchez-España J,Wang K,Falagán C,Yusta I,Burgos WD

更新日期：2018-01-01 00:00:00

abstract：:Biogeochemical changes in marine sediments during coastal water hypoxia are well described, but less is known about underlying changes in microbial communities. Bacterial and archaeal communities in Louisiana continental shelf (LCS) hypoxic zone sediments were characterized by pyrosequencing 16S rRNA V4-region gene fr...

journal_title：Geobiology

authors： Devereux R,Mosher JJ,Vishnivetskaya TA,Brown SD,Beddick DL Jr,Yates DF,Palumbo AV

更新日期：2015-09-01 00:00:00

abstract：:Alvinellid polychaete worms form multilayered organic tubes in the hottest and most rapidly growing areas of deep-sea hydrothermal vent chimneys. Over short periods of time, these tubes can become entirely mineralized within this environment. Documenting the nature of this process in terms of the stages of mineralizat...

journal_title：Geobiology

authors： Georgieva MN,Little CT,Ball AD,Glover AG

更新日期：2015-03-01 00:00:00

abstract：:The Strelley Pool Formation (SPF) is widely distributed in the East Pilbara Terrane (EPT) of the Pilbara Craton, Western Australia, and represents a Paleoarchean shallow-water to subaerial environment. It was deposited ~3.4 billion years ago and displays well-documented carbonate stromatolites. Diverse putative microf...

journal_title：Geobiology

authors： Sugitani K,Mimura K,Takeuchi M,Lepot K,Ito S,Javaux EJ

更新日期：2015-11-01 00:00:00

abstract：:The Atacama Desert is the driest non-polar desert on Earth, presenting precarious conditions for biological activity. In the arid coastal belt, life is restricted to areas with fog events that cause almost daily wet-dry cycles. In such an area, we discovered a hitherto unknown and unique ground covering biocenosis dom...

journal_title：Geobiology

authors： Jung P,Baumann K,Lehnert LW,Samolov E,Achilles S,Schermer M,Wraase LM,Eckhardt KU,Bader MY,Leinweber P,Karsten U,Bendix J,Büdel B

更新日期：2020-01-01 00:00:00

abstract：:In modern microbial mats, hydrogen sulfide shows pronounced sulfur isotope (δ34 S) variability over small spatial scales (~50‰ over <4 mm), providing information about microbial sulfur cycling within different ecological niches in the mat. In the geological record, the location of pyrite formation, overprinting from m...

journal_title：Geobiology

authors： Gomes ML,Fike DA,Bergmann KD,Jones C,Knoll AH

更新日期：2018-01-01 00:00:00

abstract：:Earth's atmospheric composition has changed significantly over geologic time. Many redox active atmospheric constituents have left evidence of their presence, while inert constituents such as dinitrogen gas (N2 ) are more elusive. In this study, we examine two potential biological indicators of atmospheric N2 : the mo...

journal_title：Geobiology

authors： Silverman SN,Kopf SH,Bebout BM,Gordon R,Som SM

更新日期：2019-01-01 00:00:00

abstract：:Organic biomarkers in marine sedimentary rocks hold important clues about the early history of Earth's surface environment. The chemical relicts of carotenoids from anoxygenic sulfur bacteria are of particular interest to geoscientists because of their potential to signal episodes of marine photic-zone euxinia such as...

journal_title：Geobiology

authors： Meyer KM,Macalady JL,Fulton JM,Kump LR,Schaperdoth I,Freeman KH

更新日期：2011-07-01 00:00:00

abstract：:Permanently anoxic regions in the ocean are widespread and exhibit unique microbial metabolic activity exerting substantial influence on global elemental cycles and climate. Reconstructing microbial metabolic activity rates in these regions has been challenging, due to the technical difficulty of direct rate measureme...

journal_title：Geobiology

authors： Louca S,Astor YM,Doebeli M,Taylor GT,Scranton MI

更新日期：2019-11-01 00:00:00

abstract：:Metal sulfide minerals, including mercury sulfides (HgS), are widespread in hydrothermal vent systems where sulfur-oxidizing microbes are prevalent. Questions remain as to the impact of mineral composition and structure on sulfur-oxidizing microbial populations at deep-sea hydrothermal vents, including the possible ro...

journal_title：Geobiology

authors： Wang CH,Gulmann LK,Zhang T,Farfan GA,Hansel CM,Sievert SM

更新日期：2020-09-01 00:00:00

abstract：:Evaporitic deposits are a globally widespread habitat for micro-organisms. The microbe-mineral environment in weathered and remobilized gypsum from exposed mid-Ordovician marine evaporite beds in the polar desert of Devon Island, Nunavut, Canadian High Arctic was examined. The gypsum is characterized by internal green...

journal_title：Geobiology

authors： Cockell CS,Osinski GR,Banerjee NR,Howard KT,Gilmour I,Watson JS

更新日期：2010-09-01 00:00:00

abstract：:It has been argued that skeletal Mg/Ca ratio in echinoderms is mostly governed by Mg2+ and Ca2+ concentrations in the ambient seawater. Accordingly, well-preserved fossil echinoderms were used to reconstruct Phanerozoic seawater Mg2+ /Ca2+ ratio. However, Mg/Ca ratio in echinoderm skeleton can be affected by a number ...

journal_title：Geobiology

authors： Kołbuk D,Di Giglio S,M'Zoudi S,Dubois P,Stolarski J,Gorzelak P

更新日期：2020-11-01 00:00:00

abstract：:Stromatolites are one of the oldest and most intriguing organosedimentary deposits. In contrast to stromatolites of the Precambrian to Early Ordovician, Phanerozoic equivalents occurred episodically under specific conditions. A group of previously undescribed stromatolites in composition occur in the Lower Triassic (O...

journal_title：Geobiology

authors： Ezaki Y,Liu JB,Adachi N

更新日期：2012-01-01 00:00:00

abstract：:Although nitrogen is a key element in organic molecules such as nucleic acids and proteins, the timing of the emergence of its modern biogeochemical cycle is poorly known. Recent studies on the antiquity of the nitrogen cycle and its interaction with free oxygen suggests the establishment of a complete aerobic N bioge...

journal_title：Geobiology

authors： Thomazo C,Ader M,Philippot P

更新日期：2011-03-01 00:00:00

abstract：:Reworked and fluidized fine-grained deposits in energetic settings are a major modern-day feature of river deltas and estuaries. Similar environments were probably settings for microbial evolution on the early Earth. These sedimentary systems act as efficient biogeochemical reactors with high bacterial phylogenetic di...

journal_title：Geobiology

authors： Aller JY,Aller RC,Kemp PF,Chistoserdov AY,Madrid VM

更新日期：2010-06-01 00:00:00

abstract：:Nitrogen forms an integral part of the main building blocks of life, including DNA, RNA, and proteins. N2 is the dominant gas in Earth's atmosphere, and nitrogen is stored in all of Earth's geological reservoirs, including the crust, the mantle, and the core. As such, nitrogen geochemistry is fundamental to the evolut...

journal_title：Geobiology

authors： Zerkle AL,Mikhail S

更新日期：2017-05-01 00:00:00

abstract：:The lower Cambrian grainy phosphorites of the northern Montagne Noire occur interbedded with grey to black, laminated to massive shales and limestones deposited along the edge of a continental shelf, associated with slope-related facies and unstable substrates. The concentration of phosphate took place by repeated alt...

journal_title：Geobiology

authors： Alvaro JJ,Clausen S

更新日期：2010-03-01 00:00:00

abstract：:Few topics in geobiology have been as extensively debated as the role of Earth's oxygenation in controlling when and why animals emerged and diversified. All currently described animals require oxygen for at least a portion of their life cycle. Therefore, the transition to an oxygenated planet was a prerequisite for t...

journal_title：Geobiology

authors： Cole DB,Mills DB,Erwin DH,Sperling EA,Porter SM,Reinhard CT,Planavsky NJ

更新日期：2020-05-01 00:00:00

abstract：:The well-known debate on the nature and origin of intracellular inclusions (ICIs) in silicified microfossils from the early Neoproterozoic Bitter Springs Formation has recently been revived by reports of possible fossilized nuclei in phosphatized animal embryo-like fossils from the Ediacaran Doushantuo Formation of So...

journal_title：Geobiology

authors： Pang K,Tang Q,Schiffbauer JD,Yao J,Yuan X,Wan B,Chen L,Ou Z,Xiao S

更新日期：2013-11-01 00:00:00

abstract：:The later Cambrian Steptoean Positive Carbon Isotope Excursion (SPICE) event was an episode marked by pronounced changes to the global biogeochemical cycles of carbon and sulfur and significant extinctions on several paleocontinents including Laurentia (North America). While the exact cause(s) of these events remains ...

journal_title：Geobiology

authors： LeRoy MA,Gill BC

更新日期：2019-07-01 00:00:00

abstract：:We here show that nano-scale mapping of elements commonly utilized in biological cycles provides a promising new additional line of evidence when evaluating the extent of the contribution of biology to microbialites. Our case study comes from Lake Clifton in Western Australia, a unique environment where living domical...

journal_title：Geobiology

authors： Wacey D,Gleeson D,Kilburn MR

更新日期：2010-12-01 00:00:00

abstract：:The diagenetic mineral assemblages in petroleum reservoirs control the formation fluid pH and pCO(2). Anaerobic biodegradation of petroleum is controlled by the transfer of electrons from reduced organic species to inorganic, redox sensitive, aqueous and mineral species in many cases through intermediates such as H(2)...

journal_title：Geobiology

authors： Onstott TC,Hinton SM,Silver BJ,King HE Jr

更新日期：2010-01-01 00:00:00