Fang Chen's research while affiliated with China Geological Survey and other places

Publications (27)

Article
A number of cold seeps have been discovered in the northern South China Sea (SCS) including the Haiyang 4 cold‐seep area where Core 973‐5 was collected. Intact polar lipids (IPLs) and core lipids (CLs) were analyzed separately in sediments from Core 973‐5. The most abundant lipid biomarkers were isoprenoidal GDGTs (isoGDGTs), with Crenarchaeol and...
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Plain Language Summary Gas hydrate, a key future clean energy resources, is a solid formed in sediments from methane and water under low‐temperature and high‐pressure conditions. The dissociation of gas hydrate has the potential to emit large quantities of methane, which is an important contributor to the greenhouse effect and ocean acidification....
Article
Seepage of methane-rich fluids, are widespread along the continental margins of the world. Intense seepages of methane may lead to the emission of this powerful greenhouse gas into the hydrosphere and atmosphere with implications in the understanding of past dramatic marine environment changes and global warming. However, euxinic environments with...
Article
Gas hydrate systems are unique habitats for microorganisms in deep marine sediments, and gas hydrate reservoirs can be divided into focused high-flux and distributed low-flux gas hydrate systems. Little is known about the microbial distribution patterns in these systems, especially in the South China Sea (SCS). In this study, a macroscopic fracture...
Article
The northwestern continental shelf of the South China Sea (SCS) is in a geographic location that was sensitive to the global paleoenvironmental change during the last glacial period. Here we present a high resolution palynological record of Core ZBW (100.65 m in length) from the continental shelf of the SCS in the past 82 ka. In contrast to results...
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Many cold seeps and gas hydrate areas have not been discovered beside the Beikan basin in the southern South China Sea (SCS), and their characteristics and histories also remain poorly known. Here we describe authigenic minerals and the carbon and oxygen isotopic composition of planktonic foraminifera Globigerinoides ruber from sediment core 2PC, r...
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Plain Language Summary The gas hydrate reservoir is a dynamically changing system extremely susceptible to variations of seafloor temperature and pressure. Therefore, gas hydrate dissociation and subsequent methane seepage frequently occur during times of global climate change, especially during sea‐level lowstands with reduced seabed pressure. How...
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Cold-water corals (CWCs) are frequently found at cold seep areas. However, the relationship between fluid seepage and CWC development is not clear. Here, for the first time, we report the occurrences, species identification, mineralogy, carbon and oxygen isotopes, as well as elemental compositions of fossil CWC skeletons from gas-hydrate-bearing se...
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16S rRNA gene profiling is a powerful method for characterizing microbial communities; however, no universal primer pair can target all bacteria and archaea, resulting in different primer pairs which may impact the diversity profile obtained. Here, we evaluated three pairs of high-throughput sequencing primers for characterizing archaeal communitie...
Article
Cold seep is a unique habitat for microorganisms in deep marine sediments, and microbial communities and biogeochemical processes are still poorly understood, especially in relation to hydrate-bearing geo-systems. In this study, two cold seep systems were sampled and microbial diversity was studied at Site GMGS2-08 in the northern part of the South...
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Amphorotia is a diatom genus of considerable morphological and biogeographical significance. It was established by transferring several Eunotia species and describing several new species. The most species were found dispersed towards Southeast Asia. In coastal areas of China, a number of species of Amphorotia were found and the assemblages containe...
Article
Anomalously low δ¹³C values of foraminifera in the stratigraphy are usually interpreted to reflect activities of paleo-methane seepage. The application of this proxy, however, requires to understand the cause of anomalously low δ¹³C signals in foraminifera. Here we present stable carbon and oxygen isotopes (δ¹³C and δ¹⁸O), Mg/Ca ratios and accelera...
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This study presents a marine palynological record of the Asian summer monsoon and sea level change in the Last Glacial Maximum (LGM) and the deglacial period in the northern South China Sea (SCS). A fossil core STD 235 (855 cm in length) and 273 surface sediment samples from the northern SCS were pollen analysed to reconstruct the paleoenvironment...
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In 2013, the China Geological Survey and Guangzhou Marine Geological Survey conducted the second Chinese gas hydrate expedition in the northern South China Sea (SCS) and successfully obtained visible gas hydrate samples. Five of the thirteen drilling sites were cored for further research. In this work, Site GMGS2-08 is selected for the stable isoto...
Article
Jiulong methane reef, a large cold seep area on the continental slope of the South China Sea (SCS), was characterized by chemosynthetic fauna, bacterial mats, methane-derived carbonate structures, and a shallow depth of sulfate-methane transition zone (SMTZ) in gravity cores. To characterize the microbial diversity and variation in correlation to m...
Article
Large amounts of authigenic pyrites occurred in the sediments of gas-hydrate drilling sites, Shenhu area, South China Sea. The morphologies of pyrites are as the form of long rod and short column, which mainly exist in the shallow sediments and gas hydrate-bearing sediments. Pyrite content ranges from 20% to 90% and reaches to the maximum at the ga...
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Microbial diversity in the hydrate-containing (sites SH3B and SH7B) and -free (sites SH1B, SH5B, SH5C) sediments collected from the Shenhu area of the South China Sea (SCS) was investigated using 16S rRNA gene phylogenetic analysis. The phylogenetic results indicate difference in microbial communities between hydrate-containing and -free sediments....
Article
Planktonic foraminifera from the core 83PC in the Xisha Trough of the northern South China Sea(SCS)have been quantitatively analyzed.The microfaunal analytical results,combined with oxygen and carbon isotopes,carbonate content and AMS14C dating data,are used in this paper to reveal paleoceanographic characteristics of the study area during the last...
Article
Candidate division JS1-and Chloroflexi-related bacteria are ubiquitous in various deep marine sediments worldwide, yet almost nothing is known about their abundance and diversity in cold seep sediments. Here, we investigated the abundance and diversity of JS1- and Chloroflexi-related bacteria in a cold seep marine sediment core collected from the n...
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South China Sea (SCS) is the largest Western Pacific marginal sea. However, microbial studies have never been performed in the cold seep sediments in the SCS. In 2004, “SONNE” 177 cruise found two cold seep areas with different water depth in the northern SCS. Haiyang 4 area, where the water depth is around 3000 m, has already been confirmed for ac...
Article
We studied the microbial diversity in the sediments of different depth in a gravity piston core HS-PC500 from Shenhu Area, the northern of South China Sea. Total DNA was extracted from the sedimental materials; the archaeal and bacterial 16S rRNA gene sequences were amplified. The clone libraries were used to analyze the microbial systematic develo...

Citations

... As such, MH is a relevant material for contemporary global environmental and energy resource issues. MH reportedly played a role in past environmental changes, such as the recovery from "snowball Earth" in the Neoproterozoic era (e.g., Zhao et al. 2021), the warming that led to the mass extinction in the Permian-Triassic boundary (e.g., Burger et al. 2019), and glacial-interglacial climate changes (e.g., Deng et al. 2021). Based on experiments, theoretical calculations, and spacecraft measurements, MH has been predicted to exist widely in the solar system Page 4 of 24 Hirai and Kadobayashi Progress in Earth and Planetary Science (2023) 10:3 beyond the Earth (e.g., Mao et al. 2007). ...
... In sediment, a Mo-As-Sb association enriched with Fe at cold seeps reflected the deep sources of ascending and mud-volcano fluids (Wang et al., 2019b). As with Sb enrichments in seep carbonates are attributed to a methane effluent particulate shuttle process in the water column and uppermost sediments at seeps (Deng et al., 2020). As a result, metals were accompanied by seep H 2 S and CH 4 to the plume area, and suspended particles become a metal exposure source to the filtering benthic species. ...
... Despite this, some methylotrophic methanogens that utilize methylated substrates can survive in the SMTZ, such as the Methanolobus, Methanofastidiosales, and Methanococcoides detected in the sediment sample (W20_3.7 m) (Fig. 4). Unfortunately, anaerobic methane oxidation via the syntropic microbial process by sulfate-reducing bacteria and ANME, i.e., AOM-SR process (Cui et al., 2020;Dong et al., 2020;Sassen et al., 1998), is very active in the SMTZ, removing the methane within the sediment pores. Therefore, the microbial gas generative potential of the sediments in the in-situ SMTZ of the marine environment is extremely poor, and they cannot be regarded as a microbial gas source. ...
... There are numerous sedimentary archives including lacustrine, peat and marine sediments around East Asia, such as Huguangyan Maar Lake (HML), and their ages can cover the entire timespan of MIS 3 (e.g., Albert et al., 2018Albert et al., , 2019Liew et al., 2006;Liu et al., 2006;Matsu'ura et al., 2018;McLean et al., 2020a, b;Mingram et al., 2004Mingram et al., , 2018Schindlbeck et al., 2018;Smith et al., 2013;Wang et al., 2014;Yu et al., 2020;Zaarur et al., 2018). Although these sites record continuous paleoenvironmental and climate information since their sedimentation began, the ages of their lower sections are beyond the dating maximum of radiocarbon (~50 ka) which limits paleoenvironmental and climate interpretations. ...
... A special mineral assemblage has been confirmed in the gas hydrate-or seepage-impact environment. In general, minerals commonly found in gas hydrate-bearing environments include authigenic carbonate minerals (e.g., calcite, dolomite, aragonite, and high-Mg calcite), sulfate minerals (e.g., gypsum and barite), and pyrite (Ritger et al., 1987;Peckmann et al., 2001;Luff and Wallmann, 2003;Egawa et al., 2015;Feng and Chen, 2015;Zhou et al., 2020). These minerals are thought to be the products of sulfatedependent anaerobic oxidation of methane (AOM, Eq. 1, Boetius et al., 2000;Devol and Ahmed, 1981;Murray et al., 1978), and this process increases the alkalinity of the environment and provides anions for the formation of authigenic minerals. ...
... Other non-chemosynthetic faunal elements, such as corals and anemones, were frequently observed attached to carbonates and along fractures. Such animals might not indicate seepage, but indicate the long-term exposition of the carbonate precipitate as hard ground for settlement and nutrients supply through water currents (Deng et al. 2019;Hovland and Risk 2003;Wang et al. 2022). Other mobile animals such as galatheoid crabs or spider crabs were widely found close to or within the fauna communities of the seep area. ...
... Many studies have focused on interpreting methane seeping activity signals based on carbon, sulfur isotopic and trace elemental systematics and the enrichment and diffusion mechanisms of trace elements (Chen et al., 2016(Chen et al., , 2019Li et al., 2018). Those researches mainly focused on the study of inorganic geochemical characteristics of authigenic carbonate (e.g., Bayon et al., 2011;Feng et al., 2018b;Wei et al., 2022), authigenic pyrite (e.g., Borowski et al., 2013;Li et al., 2018) and bulk sediment inorganic (e.g., Feng et al., 2018b;Wei et al., 2019) as well as organic geochemical characteristics (e.g., biomarker, Aloisi et al., 2002;Knittel et al., 2005). ...
... The differences between archaea and bacteria PCR amplification mainly lie in the use of primers and the amplification cycle. The V4 and V5 regions of the archaea 16S rRNA gene were amplified using the primers Arch519F (5 -CAGCCGCCGCGGTAA-3 ) and Arch915R (5 -GTGCTCCCCCGCCAATTCCT-3 ) [32]. In addition, the PCR amplification cycle was as follows: initial denaturation at 94 • C for 4 min followed by 30 cycles of denaturation at 94 • C for 15 s, annealing at 56 • C for 30 s, and elongation at 68 • C for 80 s with a final extension of 72 • C for 10 min. ...
... The second is the Haima cold seep, which is located in the western Qiongdong Southeast Basin . Although the microbial community structures of cold seeps in the SCS have been studied, almost all reports have focused on sediments (Cui et al., 2019;Li et al., 2020b;Lu et al., 2021;Niu et al., 2017;Wu et al., 2018;Zhang et al., 2021). In contrast, studies of the characteristics of microbial communities in the water column above cold seeps are relatively scarce. ...
... In China, there are reports of species of Sellaphora in many areas, such as Inner Mongolia (Skvortzow 1930, Skvortzow 1938, Hu et al. 2013, Tibet (Zhu & Chen 2000, Li et al. 2010c, Yunnan Province (Li et al. 2010a(Li et al. , 2010b, Guizhou Province (You et al. 2017), Xinjiang Uygur Autonomous Region (Lin et al. 2018), and Hainan Province (Liu et al. 2020). Besides, previous studies on the Pearl River show the presence of 70 genera and 279 species, mainly distributed in Guangdong Province (Wang 1998, Zong et al. 2010a, Yao et al. 2015, Wang et al. 2018, Wu et al. 2019, Wang et al. 2021 and Guangxi Zhuang Autonomous Region (Li et al. 2019, Liu et al. 2021, Wang et al. 2021. However, new diatom taxa from this river system have come from the following genera: Amphorotia Williams & Reid (Wu et al. 2019), Campylodiscus Ehrenberg (Wang 1998), Cymbella Agardh (Li et al. 2019), Delicatophycus M.J. Wynne (Liu et al. 2021), Eunotia Ehrenberg (Wang 1998), Gomphonema Ehrenberg (Wang 1998), and Neidium Pfitzer (Wang 1998). ...