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Journal of Earth Science : Volume 28, Issue 1, February 2017

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Fluid inclusion and geochemistry studies of calcite veins in Shizhu synclinorium, central China: Record of origin of fluids and diagenetic conditions

Content Provider	Springer Nature Link
Author	Wang, Xiao Gao, Jian He, Sheng He, Zhiliang Zhou, Yan Tao, Ze Zhang, Jiankun Wang, Yi
Copyright Year	2017
Abstract	Calcite veins in carbonate fracture have been investigated by petrographic, fluid inclusion, geochemical analyses and coupled with basin modeling techniques to provide useful insights into fluid activity and deformation conditions of the Cambrian to Triassic Shizhu synclinorium from the western region of Mid-Yangtze, central China. The results of the fluid inclusion microthermometry show a wide range of homogenization temperatures (78.6-215.5 °C) and salinities (0.18-23.11 wt.% NaCl equivalent), indicating the formation under diverse fluid conditions. All the calcite veins have negative Ce anomalies, which are the typical characteristic of marine carbonate sediments; it is therefore plausible that calcite veins were precipitated from the marine basin fluid. The stable carbon iso-topic compositions of calcites (δ $^{13}$C$_{V-PDB}$=-2.5‰-4.26‰) and host limestones (δ $^{13}$C$_{V-PDB}$=-3.56‰-5.80‰) are very similar with a correlation coefficient of 0.86, however, four calcites from the Lower Permian and Lower Triassic show lower δ $^{13}$C values relative to the host limestones, and they are depleted in total REE concentrations (ΣREE ratio varies from 0.74 to 2.06), suggesting the derivation of dissolved carbon from marine carbonates hosting the calcite veins and, less commonly, from the degradation of organic matter. Calculated δ $^{18}$O of the fluids-precipitating calcites (δ $^{18}$O$_{V-SMOW}$=-0.41‰-14.42‰), $^{87}$Sr/$^{86}$Sr ratios varying in the range of coeval seawater and the distinct REE pattern simultaneously suggest calcite-forming fluids in each stratigraphic unit could have formed from the involvement of fluids that originated from coeval seawater and evolved through different degrees of water rock interaction. However, the presence of more radiogenic $^{87}$Sr/$^{86}$Sr ratios than coeval seawater and pronounced positive Eu anomalies in calcites of Lower to Middle Ordovician rocks indicate that terrestrial input from upper strata mudstone and siliciclastic rocks could be involved in the precipitation of the Ordovician calcite. Fluid-inclusion data combined with burial and thermal history modeling indicate there was large-scale flow of evolved basinal fluids through the carbonate formation fractures spanning a time frame from 135 to 50 Ma (Early Cretaceous-Eocene). Therefore, the geochemical characteristics of calcite veins can provide the basis for deformation events in Late Yanshanian and Early Himalayan orogeny.
Starting Page	315
Ending Page	332
Page Count	18
File Format	PDF
ISSN	1674487X
Journal	Journal of Earth Science
Volume Number	28
Issue Number	2
e-ISSN	1867111X
Language	English
Publisher	China University of Geosciences
Publisher Date	2017-04-28
Publisher Place	Wuhan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mid-Yangtze marine carbonate fluid flow calcite veins fluid inclusions geochemistry Earth Sciences Geotechnical Engineering & Applied Earth Sciences Biogeosciences Geochemistry Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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