The Sr/Ba ratio response to salinity in clastic sediments of the Yangtze River Delta

Wang, Aihua; Wang, Zhanghua; Liu, Jiankun; Ni, Xiaobo; Li, Hualing

doi:10.1016/j.chemgeo.2020.119923

Cited by 87 publications

(40 citation statements)

References 26 publications

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“…The analytical precision is within 0.1%. HAc extractable Sr and Ba analysis followed the method developed by Wang et al (2021) and were determined by inductively coupled plasma-atomic emission spectrometry (ICP-AES, Thermo iCAP 7400), which has precision better than 10%. The weak acid treatment aims to target only the exchangeable and carbonate-related fractions, which are believed to be produced in the depositional environment and to be related specifically to salinity (Wang et al, 2021).…”

Section: Methodsmentioning

confidence: 99%

“…In marine environments, abundant sulphate enables reduced sulfide accumulation in sediments resulting in higher TS and TS/TOC values in comparison to freshwater environments (Berner & Raisewell, 1984). In comparison to Ba, Sr is more abundant in the marine environment and therefore a higher Sr/Ba ratio generally indicates greater salinity (e.g., Chen et al., 1997; Wang et al., 2021; Wei & Algeo, 2020). In this study, we report the granulometric, environmental magnetic and geochemical (TOC, TS, Sr/Ba) analyses of three cores from the Yangtze River Delta.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Greigite as an Indicator for Salinity and Sedimentation Rate Change: Evidence From the Yangtze River Delta, China

et al. 2021

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Greigite as an Indicator for Salinity and Sedimentation Rate Change: Evidence From the Yangtze River Delta, China

et al. 2021

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“…The Mn/Sr ratios of the different types of dolostone are all <2 (average = 0.79), which means that diagenetic alteration was relatively limited and geochemical information regarding the original fluid is well-preserved (Kaufman et al, 1993; Liu et al, 2020). The Sr/Ba ratios of the different types of dolostone are all >1 (average = 44.03), which are anomalously high and reflect deposition in highly saline seawater (Wang et al, 2021). δ 13 C values of the different types of dolostone are similar to those of Ordovician seawater (Figure 7), indicating that the dolomitizing fluids were originally derived from seawater (Veizer et al, 1999).…”

Section: Discussionmentioning

confidence: 99%

Genesis and pore evolution of dolomite reservoir in the Majiagou Formation, Ordos Basin, China

Wang

Tan

et al. 2021

Energy Exploration & Exploitation

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In gypsum–carbonate rock assemblages, multistage and complex fluids control the formation of dolomite reservoirs that are a focus of hydrocarbon exploration. It is difficult to determine the types of dolomite reservoirs and their formation mechanisms due to the diverse rock assemblages and multiple stages of diagenesis. In this study, we investigated the petrology, reservoir physical properties, and geochemistry of the 6th sub-member of member five of the Majiagou Formation (i.e. Ma56) in the Ordos Basin, China. These data were used to determine the nature and types of gypsum–carbonate rocks, and constrain their reservoir characteristics and diagenetic history, and fluid-related mechanisms that led to dolomite reservoir development and preservation. The Ma56 was deposited on a restricted evaporatic platform in the North China Craton, and contains three main types of dolomite reservoirs with variable types of reservoir space. Dolomite reservoir formation was closely related to penecontemporaneous dolomitization, karstification, and differential cementation. Early large-scale dolomitization produced dolomitized carbonate sediments that were resistant to compaction and dissolution, which was conducive to the preservation of primary and secondary pores. The intermittent exposure and dissolution of mound–shoal facies sediments, due to high-frequency sea-level fluctuations, was the dominant mechanism for formation of secondary dissolved pores and high-quality reservoirs. During burial, differential cementation occurred due to interaction between fluids and pore size, which determined the extent of reservoir preservation. In general, the studied dolomite reservoirs have undergone multistage diagenesis and alteration, which led to complex and multistage development of the reservoir porosity. However, the reservoir lithology and pore space developed mostly in the depositional to penecontemporaneous stages. Our results provide new insights into the origins of deeply buried dolomite reservoirs in carbonate–evaporite successions.

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“…Geochemical Analysis. The Sr/Ba ratio value is a geochemical indicator to distinguish terrestrial and marine sedimentary environments [28]. The geochemical index V/ ðV + NiÞ shows that Lopingian coal-bearing series was formed in an oscillatory anoxic depositional environment, and the paleosalinity index Sr/Ba shows that the Lopingian was a semisaline-brackish water environment, where Mn elements could exist in seawater in a relatively stable manner as Mn 2+ , and Fe was easily oxidized to Fe 3+ .…”

Section: Lithofacies and Depositional Environmentsmentioning

confidence: 99%

Multiple Influences of Paleogeography, Sequence Stratigraphy, and Fold Structure on Coalbed Methane Accumulation in the Lopingian (Late Permian) of Junlian Coalfield, SW China

Gao

Yang

et al. 2021

Geofluids

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Junlian coalfield is one of the main targets for coalbed methane (CBM) exploration and development in the southwest China. Based on field geological survey, core observation, gas content statistics, coal maceral composition, vitrinite reflectance ( R O ), proximate analysis and trace element test, lithological types, lithofacies, sedimentary environment, and structural analysis, this research established the sequence stratigraphy frame, revealed the plane distribution characteristics of sedimentary facies, and defined CBM accumulation mode. The results show that six rock types were identified and further subdivided into twenty lithofacies types. Four types of sedimentary systems such as alluvial plains, delta, lagoon-tidal flat, and carbonate platform were summarized according to their combination characteristics. Additionally, 12-14 fourth-order sequences and three third-order sequences CSI, CSII, and CSIII were divided, and a sequence stratigraphic framework of the Lopingian coal-bearing series was established. Among them, the features of third-order sequence CSIII paleogeography from west to east are alluvial plains, deltas, lagoon-tidal flats, and limited carbonate platforms. Thick coal seams are mainly developed in the sedimentary environment of tidal flats, delta plains, and floodplains behind banks. Closely related to coal seam thickness, gas contents of Lopingian coal seams are generally higher than 8 m3/t, except the low level in northwest and partial denudation areas. CBM accumulation is significantly controlled by the fold structure, and the hydraulic plugging effect makes the syncline core favorable for CBM accumulation. Furthermore, favorable geostress conditions enable the secondary anticline to become a favorable area for CBM accumulation when the sealing conditions are better. This research will provide a theoretical guide for the exploration and development of CBM in the study area.

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The Sr/Ba ratio response to salinity in clastic sediments of the Yangtze River Delta

Cited by 87 publications

References 26 publications

Greigite as an Indicator for Salinity and Sedimentation Rate Change: Evidence From the Yangtze River Delta, China

Greigite as an Indicator for Salinity and Sedimentation Rate Change: Evidence From the Yangtze River Delta, China

Genesis and pore evolution of dolomite reservoir in the Majiagou Formation, Ordos Basin, China

Multiple Influences of Paleogeography, Sequence Stratigraphy, and Fold Structure on Coalbed Methane Accumulation in the Lopingian (Late Permian) of Junlian Coalfield, SW China

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