Article
Environmental Sciences
Yongfeng Shi, Yuehan Lu, Yucheng Zhang, Xiaotong Su, Qihang Wu, Huifang Lei, Linchuan Fang, Fengbao Zhang, Zhineng Liu, Jie Han, Bixian Mai
Summary: This study assessed the risk of PAHs in sediments in the Wei River Basin, finding that PHE and FLT were the dominant compounds. The total carcinogenicity risk was low, while the ecological risk of individual PAHs was moderate.
WATER AIR AND SOIL POLLUTION
(2021)
Article
Geochemistry & Geophysics
James Andrew Leong, Juan Carlos de Obeso, Craig E. Manning, Peter B. Kelemen
Summary: This study quantifies the evolution of carbon-bearing fluids mobilized from subducting sedimentary rocks in the overlying mantle using thermodynamic modeling. The results show that the extent of carbon mineralization in the mantle depends on the source and composition of the fluids, as well as the fluid path. Different mineral assemblages are predicted along different fluid paths, and the formation of reduced fluids rich in hydrogen, methane, and organic species is also observed.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geology
Marko Szmihelsky, Matthew Steele-MacInnis, Wyatt M. Bain, Hendrik Falck, Robin Adair, Brandon Campbell, S. Andrew Dufrane, Ashley Went, Hilary J. Corlett
Summary: This study provides evidence of fluid mixing between basinal brines and oil during the deposition of coarse sphalerite in a classic carbonate-hosted Pb-Zn district. The presence of petroleum as a reductant enabled the conversion of aqueous sulfate to sulfide, triggering sphalerite deposition in the ore system.
Article
Geosciences, Multidisciplinary
Li Li, Lian Jiang, Simon C. George, Zhaojun Liu
Summary: The analysis of aromatic compounds in lacustrine sediment samples from the Jiufotang Formation in the Chaoyang Basin revealed different characteristics in terms of environmental, maturity, and source-related parameters, indicating variations influenced by sedimentary environment, early productivity, and organic matter sources.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Microbiology
Josue A. Rodriguez-Ramos, Mikayla A. Borton, Bridget B. McGivern, Garrett J. Smith, Lindsey M. Solden, Michael Shaffer, Rebecca A. Daly, Samuel O. Purvine, Carrie D. Nicora, Elizabeth K. Eder, Mary Lipton, David W. Hoyt, James C. Stegen, Kelly C. Wrighton
Summary: Rivers play a significant role in global carbon and nitrogen cycles, but research on microbial and viral communities in sediment environments is still in its early stages. By integrating various "omics" data, researchers have created a conceptual model that uncovers new roles for microorganisms in organic matter decomposition, carbon sequestration, nitrogen mineralization, and more. They also provide insights into viral modulation of river sediment carbon and nitrogen cycling.
Article
Engineering, Environmental
Lulu Mao, Wenbo Ren, Xitao Liu, Mengchang He, Chunye Lin, Ying Zhong, Yang Tang, Wei Ouyang
Summary: In this study, the total mercury (THg) content and mercury isotope composition in sediments in the Lianxi River, Zijiang River, and South Dongting Lake were investigated to identify and quantify multiple mercury sources and evaluate mercury environmental processes. The results showed that the THg content, delta Hg-202, and Delta Hg-199 values in the sediments varied from 48.22 to 4284.32 μg/kg, 1.33 to 0.04‰, and 0.25 to 0.03‰, respectively. The sediments from the Lianxi River, Zijiang River, and South Dongting Lake exhibited distinct mercury isotope characteristics, indicating significant variations in dominant mercury sources in these regions. Source apportionment based on MixSIAR revealed that mercury in sediments mainly originated from industrial activities, with non-ferrous metal smelting being the dominant industrial mercury contributor in the Lianxi River. Compared to the Lianxi River, the relative contribution of mercury from industrial activities significantly decreased, while the relative contributions of mercury from background releases significantly increased in the Zijiang River and South Dongting Lake.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Geology
Xiaowen Hu, Xiaoyong Yang, Yisu Ren, Gaofeng Du, Zhaojian Wu
Summary: The Beisantai deposit is a newly discovered uranium deposit in northwest China. This study reveals the genetic process and mineralization characteristics of the deposit, with a focus on calcite cements and pyrites. The involvement of microbes is also highlighted.
ORE GEOLOGY REVIEWS
(2022)
Article
Ecology
O. Soloveva, E. A. Tikhonova, O. A. Mironov, T. E. Alyomova
Summary: Oil and petroleum products are common pollutants in the marine environment, posing challenges in interpreting pollution data. This study used gas chromatographic methods to determine hydrocarbon content, distribution, and sources in the Chernaya River, finding that autochthonous production is the main source, while oil and petroleum products rank third in importance.
REGIONAL STUDIES IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Runqiu Huang, Qing Liu, Yifei Zhao, Wenting Shi, Min Xu
Summary: The study measured 16 congeners of PAHs in 32 surface sediment samples in the Jiangsu coastal zone, East China, and found that their concentrations were significantly lower than in other coastal areas of China. The spatial distribution of PAHs showed an increasing trend from nearshore to offshore, influenced by regional sedimentary dynamic environment. Risk assessment indicated that long-term seafood consumption in the area does not pose a significant cancer risk for all age groups.
MARINE POLLUTION BULLETIN
(2021)
Article
Geography, Physical
Zhen Wei, Xianghui Li, Andrew K. Laskowski, Aislin N. Reynolds, Xiaolong Fan
Summary: This study investigates the Lilong succession in southeastern Tibet, China, confirming its provenance from the central-northern and southern Lhasa Terrane based on observations from petrography, stratigraphy, sedimentology, detrital-zircon geochronology, and bulkrock Sr-Nd isotope analysis. The Lilong succession is proposed to correlate with the Ngamring Formation in the Xigaze forearc basin, suggesting it as a counterpart remnant of the eastern Xigaze forearc basin system, different from the forearc basin systems in the western Himalaya.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Fenglin Lu, Hua Zhang, Chenglin Liu, Pengcheng Jiao, Yanjun Zhao, Yi Ge
Summary: The study analyzed the petrology and geochronology of sediments in the Tarim Basin, revealing the late Quaternary drainage evolution and source-sink relations. Results showed a stable sediment supply from the Tianshan Mountains and suggested that rivers draining the western basin were likely immature until the middle Pleistocene.
Article
Water Resources
I. A. Nemirovskaya, P. O. Zavialov, A. V. Khramtsova
Summary: The article presents the results of studies on aliphatic hydrocarbons in suspension in surface water and the surface layer of bottom sediments in the Kerch Strait in April and September 2019, comparing them with other regions of the Black Sea. Despite high concentrations of aliphatic hydrocarbons, the composition of alkanes was found not to be of petroleum type due to the rapid transformation of petroleum hydrocarbons. The pollution in the strait was characterized by higher concentrations of hydrocarbons in lipids and C-org, the presence of naphthene-aromatic compounds in alkane composition, and the predominance of phytane over pristine.
Article
Geochemistry & Geophysics
Takashi Taniwaki, Chris Elders, Michael Ernst Boettcher, Alex Holman, Kliti Grice
Summary: The study assesses the differences between photic zone euxinia (PZE) and microbialites in the Early Triassic of the northern Perth Basin. Biomarkers associated with green, purple, and green-brown sulfur bacteria were found in dark-colored mudstones, while they were absent in light-colored mudstones. The presence of microbialites suggests the sequestration of mercury (Hg) through sulfur compounds. Isotopic analysis reveals distinct carbon and sulfur cycling pathways between PZE and microbialites, possibly driven by differences in microbial community structure and the relative abundance of purple sulfur bacteria. The study highlights the development of multiple harsh environmental conditions in the northern Perth Basin.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Environmental Sciences
Xiongyi Miao, Yupei Hao, Jiawei Cai, Yincai Xie, Jingru Zhang
Summary: The study investigates the accumulation of PAHs in sediments in the karstic Liujiang River Basin, revealing their sources, input processes, and toxicity risk. The concentrations of n-ary sumation 15PAHs range from 111.97 to 593.39 ng/g, with the majority concentrated upstream and midstream of Liujiang River. The findings suggest that PAHs mainly originate from mixed combustion of oil and coal, biomass combustion, and oil products leaking. The results indicate a moderate contamination of PAHs based on RQNCs and RQMPCs values. The ingestion of PAHs poses the main risk to public health, especially for children. The overall non-carcinogenic risk of PAHs is low, but the carcinogenic risk is relatively high.
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
Chukwujindu M. A. Iwegbue, Ernest Bebenimibo, Grace Obi, Godswill O. Tesi, Chijioke Olisah, Francis E. Egobueze, Bice S. Martincigh
Summary: This study provides data on the characteristic levels, spatial patterns, sources, and risk of n-alkanes and polycyclic aromatic hydrocarbons in surficial sediments from the Escravos River Basin in Nigeria. The concentrations of these compounds in sediments exceeded guideline values, indicating potential ecological and health risks. The study suggests that these compounds mainly originate from petroleum sources and combustion emissions.
ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
(2021)
