PANGAEA_811050 (Table 1) Geochemical and geothermometry data from fibrous calcite vein fills in the Dabashan Fold Belt, China Li, Rongxi; Dong, Shuwen; Lehrmann, Daniel; Duan, Lizhi (Table 1) Geochemical and geothermometry data from fibrous calcite vein fills in the Dabashan Fold Belt, China 2013-05-02 PANGAEA Dataset Supplement to: Li, Rongxi; Dong, Shuwen; Lehrmann, Daniel; Duan, Lizhi (2013): Tectonically driven organic fluid migration in the Dabashan Foreland Belt: evidenced by geochemistry and geothermometry of vein-filling fibrous calcite with organic inclusions. Journal of Asian Earth Sciences, 75, 202-212, https://doi.org/10.1016/j.jseaes.2013.07.026 https://doi.pangaea.de/10.1594/PANGAEA.811050 Investigator Rongxi Li Earth Science Sample code/label LATITUDE LONGITUDE Lithology/composition/facies Homogenization temperature Freezing point depression Maximal reflectance of bitumen δ13C, organic matter δ18O, organic matter Silicon dioxide Aluminium oxide Sodium oxide Potassium oxide Magnesium oxide Calcium oxide Manganese oxide Iron oxide, FeO Phosphorus pentoxide Sulfite Titanium dioxide geoscientificInformation Dabashan_Foreland_Belt Sampling by hand Linkam THMS600 microscope stage Microphotometer LEITZ MPV-3 Mass spectrometer Finnigan MAT 251EM Electron microprobe (EMP) 2008-06-04 2008-07-19 Complete 31.35 32.52250000000001 107.6175 108.6435 unrestricted CC-BY-3.0: Creative Commons Attribution 3.0 Unported English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

Leobener Str.

Bremen Bremen 28359 Germany online 726 data points text/tab-separated-values

Fibrous calcite veins with organic inclusions have been widely considered as indicators of oil and gas generation and migration under overpressure. Abundant fibrous calcite veins containing organic-bearing inclusions occur in faulted Lower Paleozoic through Triassic hydrocarbon source rocks in the Dabashan Foreland Belt (DBF). d13CPDB and d18OPDB values of the fibrous calcite range from - 4.8 to -1.9 to per mil and - 12.8 to - 8.4 per mil respectively, which is lighter than that of associated carbonate host rocks ranging from - 1.7 to + 3.1 per mil and - 8.7 to - 4.5 per mil. A linear relationship between d13CPDB and d18OPDB indicates that the calcite veins were precipitated from a mixture of basinal and surface fluids. The fibrous calcite contains a variety of inclusions, such as solid bitumen, methane bearing all-liquid inclusions, and vapor-liquid aqueous inclusions. Homogenization temperatures of aqueous inclusions range from 140 to 196° with an average of 179°. Salinities of aqueous inclusions average 9.7 wt% NaCl. Independent temperatures from bitumen reflectance and inclusion phase relationships of aqueous and methane inclusions were used to determine fluid pressures. Results indicate high pressures, elevated above typical lithostatic confining pressure, from 150 to 200 MPa. The elevated salinity and high temperature and pressure conditions of the fibrous calcite veins argue against an origin solely from burial overpressure resulting from clay transformation and dehydration reactions. Instead fluid inclusion P-T data and geochemistry results and regional geology indicate abnormally high pressures during fluid migration. These findings indicate that tectonic stress generated fracture and fault fluid pathways and caused migration of organic bearing fluids from the DBF during the Yanshan orogeny. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.811050"!

http://en.wikipedia.org/wiki/ISO_6709 LATITUDE http://en.wikipedia.org/wiki/ISO_6709 LONGITUDE http://en.wikipedia.org/wiki/Sichuan Sichuan, Shaanxi, China http://www.linkam.co.uk/thms600-features/ Linkam THMS600 microscope stage https://doi.org/10.1016/j.jseaes.2013.07.026 Tectonically driven organic fluid migration in the Dabashan Foreland Belt: evidenced by geochemistry and geothermometry of vein-filling fibrous calcite with organic inclusions https://en.wikipedia.org/wiki/Calcium_oxide Calcium oxide https://en.wikipedia.org/wiki/Silicon_dioxide Silicon dioxide https://en.wikipedia.org/wiki/Sulfite Sulfite https://en.wikipedia.org/wiki/Titanium_dioxide Titanium dioxide DIF 9.4 2013-05-02 2026-05-01