Rapid Separation and Precise Determination of Strontium Isotopic from Geological Samples with High Rubidium/Strontium Ratios

Wang, Xinyang; Li, Zhi-Dan; Wei, Shuang; Chen, Ji; Liu, Yu; Ao, Cong; Xiao, Zhibin; Zhou, Hongying; Liu, Hui

doi:10.1016/s1872-2040(19)61172-2

Cited by 11 publications

(4 citation statements)

References 20 publications

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“…The JNdi-1 Nd standard yielded l43 Nd/ 144 Nd = 0.512116 ± 0.000007 (2σ) (Tanaka et al 2000), and the international rock standard BCR-2 ( 143 Nd/ 144 Nd = 0.512643 ± 0.000011; 2σ) was used to evaluate the separation and puri cation of Nd. Detailed instrumental parameters and separation process were described in Liu et al (2019). The Sm-Nd isochron ages were calculated with the Isoplot/Ex_V3 program (Ludwig 2003).…”

Section: Dolomite Geochemical and Sr And Sm-nd Isotopic Analysesmentioning

confidence: 99%

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The shallow marine VMS copper deposit of Yushui, Eastern Guangdong, South China: Evidence from geology, geochronology and geochemistry

Chen,

Yang,

et al. 2023

Preprint

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Many massive sulfide deposits have been discovered in the Upper Paleozoic rift-related volcaniclastic sequence in South China, among which the Yushui copper deposit is the most important due to its high grade. The deposit has been variably attributed as SEDEX (Sedimentary Exhalative) or MVT (Mississippi Valley Type). The Yushui copper deposit in Guangdong (South China) contains stratiform bornite-chalcopyrite orebodies (102.1 kt Cu @ 3.5%, 186.6 kt Pb @ 4.29%, 117.6 kt Zn @ 2.91% and 339 t Ag @ 112 g/t) developed along the contact between Upper Carboniferous dolostone and Lower Carboniferous pebbly quartz sandstone, which indicates a shallow marine deposition environment. The Yushui deposit comprises an upper massive sulfide orebody and a lower stockwork orebody with intense alteration. In this study, we newly identified Carboniferous tuffs and syn-volcanic faults in the footwall, and exhalites in the hanging-wall. Hematite from the Cu ores yielded a U-Pb age of 320 ± 15 Ma (MSWD = 2.1, n = 57), and hydrothermal dolomite yielded a Sm-Nd isochron age of 308.1 ± 4.6 Ma (n = 7; MSWD = 0.94), which constrains the timing of mineralization at Yushui. These ages are coeval with the Carboniferous host rocks. Combining the evidence from the geological features (syn-volcanic faults, volcanic rocks, exhalites) and hematite trace element compositions, we suggest that the Yushui is a shallow marine VMS (Volcanogenic Massive Sulfide) deposit. The Sr-Nd isotope composition of hydrothermal dolomite (εNd ~-12) indicates that the ore-forming materials were originated from the crustal basement. The Yushui copper deposit was likely formed during the Late Carboniferous continental backarc extension in eastern South China. The regional extension may have caused enhanced heat flow, which promoted fluid convection in the basement rocks. In addition, we suggest that volcanic rocks and disseminated chalcopyrite-pyrite mineralization in the Lower Carboniferous quartz sandstone and exhalites are good indicators for regional VMS prospecting.

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Section: Dolomite Geochemical and Sr And Sm-nd Isotopic Analysesmentioning

confidence: 99%

“…The international BCR-2 Sr standard yielded 87 Sr/ 86 Sr = 0.705024 ± 0.000007 (2SE). The use of laboratory resin and its separation process followed those described by Liu et al (2019).…”

Section: Dolomite Geochemical and Sr And Sm-nd Isotopic Analysesmentioning

confidence: 99%

The shallow marine VMS copper deposit of Yushui, Eastern Guangdong, South China: Evidence from geology, geochronology and geochemistry

Chen,

Yang,

et al. 2023

Preprint

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“…Blank values during the analyses were controlled less than 74 pg for Sm and 81 pg for Nd. Details about the instrument parameters and separation process are described in the related literature (Liu et al, 2019). The Sm-Nd isochron ages were calculated using the Isoplot/Ex_V3 program of Ludwig (2003).…”

Section: Sm-nd Dating and Sr-nd Isotopic Analysis Of Calcitesmentioning

confidence: 99%

Sm‐Nd isochron age and Sr‐Nd isotopes of the calcite from the Nibao gold deposit in the Youjiang Basin, SW China

Bagas

Han

et al. 2022

Resource Geology

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The Youjiang Basin in SW China is the second‐largest Carlin‐like goldfield in the world after Nevada, USA. However, the age and the hydrothermal origin of the gold mineralization are still in controversy, which leads to ambiguities in understanding the geodynamic setting and genetic mechanism of the gold deposition. Nibao is a large, stratabound, and fault‐controlled Carlin‐type gold deposit in the north of the Youjiang Basin. Three ore stages have been recognized in the evolution of the mineralizing hydrothermal fluid, with the stages being characterized by assemblages of the early quartz–porous pyrite, the main quartz–calcite‐apatite–sericite–pyrite–arsenopyrite‐gold, and the late quartz–calcite–fluorite–realgar–orpiment–stibnite. Calcite veins from the main and late ore stage at Nibao are enriched in middle rare earth elements, which is a distinctive characteristic of hydrothermal calcite veins associated with low‐temperature hydrothermal Au‐Sb deposits in the Youjiang Basin, and yield a Sm‐Nd isochron age of 138 ± 1 Ma. The vast majority of the ore stage calcite samples have narrow 87Sr/86Sr ratios and εNd(t) values ranging from 0.708119 to 0.708423 and − 1.1–−3.3, respectively, indicating that the gold‐bearing hydrothermal fluid could be derived from the mixing of mantle and crustal materials. Therefore, we proposed that the gold mineralization during the Early Cretaceous in the Youjiang Basin was triggered by the large‐scale lithosphere extension following the retreat of the subducted Paleo‐Pacific oceanic crust, and the hydrothermal fluid could be originated from the mantle and underwent the contamination of Yangtze upper continental crust.

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“…The following are available online at https://www.mdpi.com/article/10 .3390/foods10081729/s1: The Supplementary Materials describes the optimization and validation of the analytical method for 87 Sr/ 86 Sr isotope ratio determination in milk; Table S1: Microwave-assisted acid digestion program used for pre-treatment of milk sample; Table S2: Comparison of the Sr concentrations obtained after microwave digestion of freeze-dried milk samples (mean ± standard deviation; n = 3); Table S3: Determined Sr concentrations after pre-treatment in certified reference materials, NIST SRM 8435 and IAEA-153 (mean ± standard deviation; n = 3); Table S4: The efficiency of Rb removal; Table S5: 87 Sr/ 86 Sr isotope ratios for IAEA-153 milk sample; Table S6: The whole dataset of authentic milk sample analysis including the description of the location, season and year of production, geological background, 87 Sr/ 86 Sr ratios, stable isotope ration of oxygen ( 18 O/ 16 O) in milk water and 13 C/ 12 C, 15 N/ 14 N and 34 S/ 32 S in casein, elemental analysis in the freeze-dried samples determined with XRF [12,14,20,25,[47][48][49][50][51][52][53][54][55].…”

Section: Supplementary Materialsmentioning

confidence: 99%

The Provenance of Slovenian Milk Using 87Sr/86Sr Isotope Ratios

Gregorčič

Ogrinc

Frew

et al. 2021

Foods

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This work presents the first use of Sr isotope ratios for determining the provenance of bovine milk from different regions of Slovenia. The analytical protocol for the determination of 87Sr/86Sr isotope ratio was optimised and applied to authentic milk samples. Considerable variability of 87Sr/86Sr ratios found in Slovenian milk reflects the substantial heterogeneity of the geological background of its origin. The results, although promising, cannot discount possible inter-annual or annual variation of the Sr isotopic composition of milk. The 87Sr/86Sr ratios of groundwater and surface waters are in good correlation with milk, indicating that the Sr isotopic fingerprint in milk is reflective of cow drinking water. The 87Sr/86Sr ratio has the potential to distinguish between different milk production areas as long as these areas are characterised by geo-lithology. Discriminant analysis (DA) incorporating the elemental composition and stable isotopes of light elements showed that 87Sr/86Sr ratio together with δ13Ccas and δ15Ncas values have the main discrimination power to distinguish the Quaternary group (group 6) from the others. Group 1 (Cretaceous: Carbonate Rocks and Flysch) is associated with Br content, 1/Sr and δ18Ow values. The overall prediction ability was found to be 63.5%. Pairwise comparisons using OPLS-DA confirmed that diet and geologic parameters are important for the separation.

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Rapid Separation and Precise Determination of Strontium Isotopic from Geological Samples with High Rubidium/Strontium Ratios

Cited by 11 publications

References 20 publications

The shallow marine VMS copper deposit of Yushui, Eastern Guangdong, South China: Evidence from geology, geochronology and geochemistry

The shallow marine VMS copper deposit of Yushui, Eastern Guangdong, South China: Evidence from geology, geochronology and geochemistry

Sm‐Nd isochron age and Sr‐Nd isotopes of the calcite from the Nibao gold deposit in the Youjiang Basin, SW China

The Provenance of Slovenian Milk Using 87Sr/86Sr Isotope Ratios

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