IF 1.8 3区地球科学

Facies Pub Date : 2023-12-19 DOI: 10.1007/s10347-023-00678-3

Joely Marie Maak, Daniel Birgel, Joachim Reitner, Eberhard Gischler, Wolf-Christian Dullo, William J. Foster, Jörn Peckmann

{"title":"Molecular fossils in reefal carbonates and sponges of the deep fore reef of Mayotte and Mohéli, Comoro Islands, western Indian Ocean","authors":"Joely Marie Maak, Daniel Birgel, Joachim Reitner, Eberhard Gischler, Wolf-Christian Dullo, William J. Foster, Jörn Peckmann","doi":"10.1007/s10347-023-00678-3","DOIUrl":"https://doi.org/10.1007/s10347-023-00678-3","url":null,"abstract":"Microbial carbonates are common components of Quaternary tropical coral reefs. Previous studies revealed that sulfate-reducing bacteria trigger microbial carbonate precipitation in supposedly cryptic reef environments. Here, using petrography, lipid biomarker analysis, and stable isotope data, we aim to understand the formation mechanism of microbial carbonate enclosed in deep fore reef limestones from Mayotte and Mohéli, Comoro Islands, which differ from other reefal microbial carbonates in that they contain less microbial carbonate and are dominated by numerous sponges. To discern sponge-derived lipids from lipids enclosed in microbial carbonate, lipid biomarker inventories of diverse sponges from the Mayotte and Mohéli reef systems were examined. Abundant peloidal, laminated, and clotted textures point to a microbial origin of the authigenic carbonates, which is supported by ample amounts of mono-O-alkyl glycerol monoethers (MAGEs) and terminally branched fatty acids; both groups of compounds are attributed to sulfate-reducing bacteria. Sponges revealed a greater variety of alkyl chains in MAGEs, including new, previously unknown, mid-chain monomethyl- and dimethyl-branched MAGEs, suggesting a diverse community of sulfate reducers different from the sulfate-reducers favoring microbialite formation. Aside from biomarkers specific for sulfate-reducing bacteria, lipids attributed to demosponges (i.e., demospongic acids) are also present in some of the sponges and the reefal carbonates. Fatty acids attributed to demosponges show a higher diversity and a higher proportion in microbial carbonate compared to sponge tissue. Such pattern reflects significant taphonomic bias associated with the preservation of demospongic acids, with preservation apparently favored by carbonate authigenesis.","PeriodicalId":51050,"journal":{"name":"Facies","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138743617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Facies analysis and depositional evolution of Lower–Middle Ordovician carbonates in the Shuntuoguole Low Uplift of Tarim Basin (NW China) 塔里木盆地顺图郭勒低隆起带（中国西北部）下-中奥陶统碳酸盐岩的岩相分析与沉积演化

IF 1.8 3区地球科学

Facies Pub Date : 2023-12-10 DOI: 10.1007/s10347-023-00676-5

Jun Han, Daizhao Chen, Zicheng Cao, Chongyang Xiao, Cheng Huang, Shi Wang, Jingping Chen, Chuan Guo

{"title":"Facies analysis and depositional evolution of Lower–Middle Ordovician carbonates in the Shuntuoguole Low Uplift of Tarim Basin (NW China)","authors":"Jun Han, Daizhao Chen, Zicheng Cao, Chongyang Xiao, Cheng Huang, Shi Wang, Jingping Chen, Chuan Guo","doi":"10.1007/s10347-023-00676-5","DOIUrl":"https://doi.org/10.1007/s10347-023-00676-5","url":null,"abstract":"As a result of a deep burial depth (> 6.5 km), the depositional history of the Early to Middle Ordovician carbonate platform in the Shuntuoguole Low Uplift (Tarim Basin, NW China) has been difficult to unravel, leading to problems in understanding the controls of the facies distribution, particularly in terms of petroleum exploration. Integrated with geophysical surveys, detailed sedimentological observations document the platform evolution and show that a carbonate ramp system developed in the Shuntuoguole Low Uplift during the Early-Middle Ordovician, with twelve lithofacies types arranged into two facies associations, including peritidal to semi-restricted subtidal and open-marine subtidal facies. Based on the tempo-spatial distribution of lithofacies, seven third-order depositional sequences are identified, each composed of a transgressive lower package and a regressive upper part. Their sequence boundaries are commonly characterised by a transitional zone with no obvious subaerial exposure features. The correlation of relative sea-level (or accommodation space) changes derived from the vertical stacking pattern of facies with the global sea-level curve of Haq and Schutter (2008) and sea-level oscillations of coeval successions worldwide suggests that eustatic sea-level fluctuations were the overriding factor controlling the development and evolution of this carbonate ramp during the Early-Middle Ordovician. Meanwhile, regional or local tectonic subsidence and environmental factors (e.g. palaeoclimate and prevailing wind) also exerted an influence on the depositional processes of the Shuntuoguole Low Uplift over this time interval.","PeriodicalId":51050,"journal":{"name":"Facies","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138559832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

The colourful optical appearance of centric diatom fossil frustules with diagenetic nanocrystalline calcite fill 具有成岩作用的纳米晶方解石充填的中心硅藻化石块状体的彩色光学外观

IF 1.8 3区地球科学

Facies Pub Date : 2023-11-30 DOI: 10.1007/s10347-023-00675-6

Moritz Liesegang, Mohamed Ghobara, Sabine Matting, Richard Wirth

{"title":"The colourful optical appearance of centric diatom fossil frustules with diagenetic nanocrystalline calcite fill","authors":"Moritz Liesegang, Mohamed Ghobara, Sabine Matting, Richard Wirth","doi":"10.1007/s10347-023-00675-6","DOIUrl":"https://doi.org/10.1007/s10347-023-00675-6","url":null,"abstract":"Biophotonic nanostructures rarely withstand fossilization processes occurring after burial over geologic time. Even more distinctive is a change introduced to the optical properties during diagenetic processes resulting in a different optical appearance. Here, we report and explain the optical appearance of centric diatom frustules obtained from ash-bearing carbonate-cemented concretions on the Greifswalder Oie island (Pomeranian Bay, Germany, southern Baltic Sea). The ultrastructural and mineralogical analysis of the fossil frustules were carried out using electron microscopy techniques and were correlated to the macroscopic and microscopic optical appearance of the frustules before and after acid etching. The unique optical properties of the fossil diatoms were associated with diagenetic nanocrystalline calcite filling the frustules’ areolae. This fill created the macroscopic pale-yellow colour of many frustules, a microscopic iridescence probably associated with diffraction grating behaviour, and microscopic colour rings. The results highlight the unique permineralization process of diatom frustules and might be an addition to the emerging studies on frustule optics and photonics.","PeriodicalId":51050,"journal":{"name":"Facies","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138528405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Evolution of eastern passive margin of Adria recorded in shallow- to deep-water successions of the transition zone between the Alps and the Dinarides (Ivanščica Mt., NW Croatia) 亚德里亚东部被动边缘的演化记录在阿尔卑斯山脉和迪纳里德斯山脉过渡带的浅-深水序列中(Ivanščica Mt.， NW Croatia)

3区地球科学

Facies Pub Date : 2023-10-01 DOI: 10.1007/s10347-023-00674-7

Matija Vukovski, Duje Kukoč, Tonći Grgasović, Ladislav Fuček, Damir Slovenec

引用次数: 0

Biohermal complex dominated by microbial carbonates from the early Miaolingian (lower Cambrian) Maozhuang Formation, North China 华北早苗岭期(下寒武统)毛庄组以微生物碳酸盐岩为主的生物热液杂岩

3区地球科学

Facies Pub Date : 2023-09-14 DOI: 10.1007/s10347-023-00673-8

Mingxiang Mei, Muhammad Riaz, Khalid Latif, Ziliang Liu, Mohamed S. Ahmed, Douaa Fathy

引用次数: 1

Early Cretaceous marine microbiofacies from the South Atlantic Ocean (Sergipe–Alagoas Basin, Brazil): palaeobiogeographical and palaeoceanographical inferences 南大西洋(巴西Sergipe-Alagoas盆地)早白垩世海洋微生物相:古地理和古海洋学推论