Origin of early Cambrian black-shale-hosted barite deposits in South China: Mineralogical and geochemical studies

Han, Shanchu; Hu, Kai; Cao, Jian; Pan, Jiayong; Xia, Fei; Wú, Wéi

doi:10.1016/j.jseaes.2015.03.002

Cited by 51 publications

(8 citation statements)

References 58 publications

(90 reference statements)

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“…The distribution characteristics of biomarkers in the three over-mature and regionally developed black shales (the Lower Cambrian, Upper Ordovician, and Lower Silurian) were significantly different, indicating the different of source material and organic characteristics. Geochemical significance of biomarkers in overmature Cambrian black shales has been also reported in several recent studies (Jin et al, 2014;Han et al, 2015). Thus, the use of organic geochemistry to indicate the organic matter type of the Lower Cambrian Niutitang shale is considered to be reliable in this study.…”

Section: Biomarkerssupporting

confidence: 64%

Sedimentary and residual gas geochemical characteristics of the Lower Cambrian organic-rich shales in Southeastern Chongqing, China

Tuo

Zhang

et al. 2016

Marine and Petroleum Geology

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Section: Biomarkerssupporting

confidence: 64%

Sedimentary and residual gas geochemical characteristics of the Lower Cambrian organic-rich shales in Southeastern Chongqing, China

Tuo

Zhang

et al. 2016

Marine and Petroleum Geology

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“…5). As such, the results may represent a mixture of multiple, including seawater, hydrothermal fluids and terrigenous input [38]. Ce/Ce* values of recrystallized limestones and barite are between 0.84 and 0.63 respectively in this study (Table 4).…”

mentioning

confidence: 76%

Origin of Barite Mineralization in the Doğanşehir (Malatya): Trace and Rare Earth Element, Isotope and Fluid Inclusion Evidence

Kara¹,

Akkoca²

2021

El-Cezeri Fen Ve Mühendislik Dergisi

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This study the main objective presented the geochemical and isotopic characteristics of the barite mineralization at the Doğanşehir (Malatya), located in the Eastern Taurids. These mineralizations observed are included in crack zones of metamorphic rocks. Trace element data of barite in the study area show that Ba, Pb and Zn may have been derived from different sources: these elements come from recrystallized limestones and siliceous rocks. The trends of the REE and the plots of the values of barites on the Ce N /Sm N versus Ce N /Yb N diagram indicate that seawater dominated the hydrothermal fluid depositing the barite and supplied the barium and sulfate ions, while a fluid mixture of seawater. Pb isotope studies ( 206 Pb/ 204 Pb=17.04-19.2; 207 Pb/ 204 Pb=14.33-17.00 and 208 Pb/ 204 ) indicate that the lead in barite was derived from the mantle, orogen, and crust and was slightly contaminated by the basement rocks. Sulfur isotopic studies indicate that the sulfur in barite has been derived from seawater sulfate sources (δ 34 SVCDT values range from 17.5 ‰ to 30.7 ‰). Microthermometric studies on barite samples range from 85°C to 122°C, with an average of 110°C. Salinities vary from 0.2 to 2.6 NaCl wt%. Homogenization temperatures of the studied fluid inclusions suggest which were probably formed in epithermal conditions.

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“…Cambrian Hetang Formation, South China. Hydrothermal activities and Ba enrichment have been reported in previous studies for this formation and its stratigraphic equivalents in other areas [16,[25][26][27][28]. In this study, a series of petrological and mineralogical analytical techniques are used to quantify the abundances of Eu and Ba and elucidate their relationship with hydrothermal activities.…”

Section: Geofluidsmentioning

confidence: 91%

Linear Correlation of Ba and Eu Contents by Hydrothermal Activities: A Case Study in the Hetang Formation, South China

Chang

Wang

2019

Geofluids

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A significant linear correlation between Ba and Eu contents has been observed in a set of mudrock formations in the lower Cambrian Hetang Formation in South China. Combined with petrographic features and reinvestigation of published data obtained from the same laboratory, the analytical interference of Ba can be excluded as a main factor of this correlation. Electron microprobe analyses (EMPA) have indicated that Ba-rich minerals (hyalophane and cymrite) precipitated from hydrothermal fluids account for the total Ba content. It is evident that significant contribution of both Ba and Eu from hydrothermal fluids is the cause of this linear relationship, while this coexistence is ultimately controlled by their similar chemical properties and abundances in rock sequences along the fluid path. This interpretation was supported by similar linear Ba-Eu correlations retrieved from barite-bearing chert in another area of the Yangtze platform during the same geological period. Therefore, linear Ba-Eu correlations may be more common than previously thought in this area, where hydrothermal activities were active during the specific time interval.

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Origin of early Cambrian black-shale-hosted barite deposits in South China: Mineralogical and geochemical studies

Cited by 51 publications

References 58 publications

Sedimentary and residual gas geochemical characteristics of the Lower Cambrian organic-rich shales in Southeastern Chongqing, China

Sedimentary and residual gas geochemical characteristics of the Lower Cambrian organic-rich shales in Southeastern Chongqing, China

Origin of Barite Mineralization in the Doğanşehir (Malatya): Trace and Rare Earth Element, Isotope and Fluid Inclusion Evidence

Linear Correlation of Ba and Eu Contents by Hydrothermal Activities: A Case Study in the Hetang Formation, South China

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