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 (Olenekian) at the Dajiang section in the Luodian region of Guizhou Province, South China. We described the textures of these stromatolites with the aim of determining the genetic mechanisms and revealing the nature of interactions between micro-organisms and marine environments. Mesoscopic features show that the stromatolites consist of several sets of stacked slices, and that they are embedded in alternating beds of fine and coarse microsphere packstones that include aggregates of microspheres, forming grapestones and lumps. Microscopically, the stromatolites consist of spar- and dolomite-infilled microspheres (average diameter, 100 μm), micrites, peloids, small-sized pyrite framboids (average diameter, 5.8 μm) and fenestrae. Micrite-dominant intercalations accentuate laminated textures at a mesoscopic level and are laterally continuous with micrite-rich parts in surrounding interstromatolites, indicating the simultaneous, widespread deposition of these layers. The microspheres and associated micrites were the products of in situ microbial activity, probably sulphate-reducing or anoxygenic phototrophic bacteria, which led to the formation of these unusual stromatolites. Even during a protracted period of harsh marine conditions, the micrite-rich carpets were deposited intermittently on the stromatolites and their surroundings under severely anoxic/sulphidic conditions. The presence of Early Triassic stromatolites and their subtle but important vertical variations in texture provide a record of temporal changes in marine conditions during geobiologically critical intervals.
journal_name
Geobiologyjournal_title
Geobiologyauthors
Ezaki Y,Liu JB,Adachi Ndoi
10.1111/j.1472-4669.2011.00309.xsubject
Has Abstractpub_date
2012-01-01 00:00:00pages
48-59issue
1eissn
1472-4677issn
1472-4669journal_volume
10pub_type
杂志文章,评审相关文献
Geobiology文献大全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
pub_type: 杂志文章
doi:10.1111/gbi.12277
更新日期:2018-05-01 00:00:00
abstract::Biotic recovery after the Cretaceous-Palaeogene (K-Pg) impact is one unsolved question concerning this mass extinction event. To evaluate the incidence of the K-Pg event on biota, and the subsequent recovery, a recent environmental disaster has been analysed. Areas affected by the contamination disaster of Aználcollar...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/j.1472-4669.2009.00213.x
更新日期:2009-12-01 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
pub_type: 杂志文章
doi:10.1111/gbi.12053
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
pub_type: 杂志文章
doi:10.1111/gbi.12334
更新日期:2019-07-01 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
pub_type: 杂志文章
doi:10.1111/j.1472-4669.2011.00285.x
更新日期:2011-07-01 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
pub_type: 杂志文章
doi:10.1111/j.1472-4669.2010.00268.x
更新日期:2011-03-01 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
pub_type: 杂志文章
doi:10.1111/gbi.12174
更新日期:2016-05-01 00:00:00
abstract::The formation of carbonate concretions is a cementation process which passively infills the pore spaces within sediments. They record the original environments of deposition and diagenetic conditions of the host rocks. Little is known about the precise mechanisms responsible for the precipitation of carbonate concreti...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12362
更新日期:2020-01-01 00:00:00
abstract::All life requires energy to drive metabolic reactions such as growth and cell maintenance; therefore, fluctuations in energy availability can alter microbial activity. There is a gap in our knowledge concerning how energy availability affects the growth of extreme chemolithoautotrophs. Toward this end, we investigated...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12413
更新日期:2021-01-01 00:00:00
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
pub_type: 杂志文章
doi:10.1111/gbi.12288
更新日期:2018-07-01 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
pub_type: 杂志文章
doi:10.1111/gbi.12269
更新日期:2018-01-01 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
pub_type: 杂志文章
doi:10.1111/j.1472-4669.2009.00224.x
更新日期:2010-01-01 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
pub_type: 杂志文章
doi:10.1111/gbi.12409
更新日期:2020-11-01 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
pub_type: 杂志文章
doi:10.1111/gbi.12229
更新日期:2017-07-01 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
pub_type: 杂志文章,评审
doi:10.1111/j.1472-4669.2010.00234.x
更新日期:2010-06-01 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
pub_type: 杂志文章
doi:10.1111/j.1472-4669.2009.00229.x
更新日期:2010-03-01 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
pub_type: 杂志文章
doi:10.1111/gbi.12127
更新日期:2015-05-01 00:00:00
abstract::New experimental results of fluid-mineral reactions at hydrothermal conditions relevant to life demonstrate that key redox reactions involving iron, sulfur, and hydrogen remain at disequilibrium at 100 °C, even in a heterogeneous system and thus are energetically favorable for microbial metabolism. Predictions from ge...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/j.1472-4669.2010.00255.x
更新日期:2010-12-01 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
pub_type: 杂志文章
doi:10.1111/gbi.12142
更新日期:2015-09-01 00:00:00
abstract::Although a variety of leaf characteristics appear to be induced by light environment during development, analysis of ontogenetic changes in living broad leaved trees has suggested that a number of other traits also lumped into the classic 'sun' versus 'shade' morphological distinctions, including leaf size, shape, and...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/j.1472-4669.2008.00176.x
更新日期:2009-03-01 00:00:00
abstract::The emplacement of subaqueous gravity-driven sediment flows imposes a significant physical and geochemical impact on underlying sediment and microbial communities. Although previous studies have established lasting mineralogical and biological signatures of turbidite deposition, the response of bacteria and archaea wi...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12271
更新日期:2018-03-01 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
pub_type: 杂志文章,评审
doi:10.1111/gbi.12382
更新日期:2020-05-01 00:00:00
abstract::Ediacaran sediments record an unusual global carbon cycle perturbation that has been linked to widespread oceanic oxygenation, the Shuram negative C isotope excursion (NCIE). However, proxy-based estimates of global ocean redox conditions during this event have been limited largely due to proxy specificity (e.g., euxi...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12379
更新日期:2020-05-01 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
pub_type: 杂志文章
doi:10.1111/gbi.12312
更新日期:2019-01-01 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
pub_type: 杂志文章
doi:10.1111/gbi.12123
更新日期:2015-03-01 00:00:00
abstract::Subseafloor sulfate concentrations typically decrease with depth as this electron acceptor is consumed by respiring microorganisms. However, studies show that seawater can flow through hydraulically conductive basalt to deliver sulfate upwards into deeply buried overlying sediments. Our previous work on IODP Site C001...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12324
更新日期:2019-03-01 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
pub_type: 杂志文章
doi:10.1111/gbi.12357
更新日期:2019-11-01 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
pub_type: 杂志文章
doi:10.1111/j.1472-4669.2010.00251.x
更新日期:2010-12-01 00:00:00
abstract::A combination of scanning transmission X-ray microscopy and X-ray magnetic circular dichroism was used to spatially resolve the distribution of different carbon and iron species associated with Shewanella oneidensis MR-1 cells. S. oneidensis MR-1 couples the reduction of Fe(III)-oxyhydroxides to the oxidation of organ...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/j.1472-4669.2012.00329.x
更新日期:2012-07-01 00:00:00
abstract::The persistence of DNA from microorganisms exposed to various concentrations of SiO2 (ranging from 0 to 3000 p.p.m.) was monitored over time. The impact of silica mineralization or silicification on the longevity of 16S rRNA and 16 s rDNA genes from whole cells of Bacillus subtilis and Escherichia coli K12 was quantif...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/j.1472-4669.2008.00177.x
更新日期:2008-12-01 00:00:00