de.pangaea.dataset811050 und dataset PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact 2026-05-01T00:21:22Z https://doi.pangaea.de/10.1594/PANGAEA.811050 2013-05-02T08:22:53 publication https://doi.org/10.1594/PANGAEA.811050 Li, Rongxi author Dong, Shuwen https://orcid.org/0000-0002-3374-5389 information author Lehrmann, Daniel

dlehrmann@trinity.edu

author Duan, Lizhi author PANGAEA

info@pangaea.de

https://www.pangaea.de/ information publisher tableDigital 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 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. completed Li, Rongxi principalInvestigator copyright copyright CC-BY-3.0: Creative Commons Attribution 3.0 Unported textTable und geoscientificInformation 107.6175 108.6435 31.35 32.52250000000001 2008-06-04T00:00:00 2008-07-19T00:00:00 Sample code/label thematicClassification LATITUDE thematicClassification LONGITUDE thematicClassification Lithology/composition/facies thematicClassification Homogenization temperature physicalMeasurement Linkam THMS600 microscope stage °C °C Homogenization temperature physicalMeasurement Linkam THMS600 microscope stage °C °C Homogenization temperature physicalMeasurement Linkam THMS600 microscope stage °C °C Homogenization temperature physicalMeasurement Linkam THMS600 microscope stage °C °C Homogenization temperature physicalMeasurement Linkam THMS600 microscope stage °C °C Homogenization temperature physicalMeasurement Linkam THMS600 microscope stage °C °C Homogenization temperature physicalMeasurement Linkam THMS600 microscope stage °C °C Freezing point depression physicalMeasurement Linkam THMS600 microscope stage °C °C Freezing point depression physicalMeasurement Linkam THMS600 microscope stage °C °C Freezing point depression physicalMeasurement Linkam THMS600 microscope stage °C °C Freezing point depression physicalMeasurement Linkam THMS600 microscope stage °C °C Freezing point depression physicalMeasurement Linkam THMS600 microscope stage °C °C Freezing point depression physicalMeasurement Linkam THMS600 microscope stage °C °C Freezing point depression physicalMeasurement Linkam THMS600 microscope stage °C °C Homogenization temperature physicalMeasurement Linkam THMS600 microscope stage; Thm °C °C Homogenization temperature physicalMeasurement Linkam THMS600 microscope stage; Thm °C °C Maximal reflectance of bitumen physicalMeasurement Microphotometer LEITZ MPV-3 % % δ13C, organic matter physicalMeasurement Mass spectrometer Finnigan MAT 251EM ‰ PDB ‰ PDB δ18O, organic matter physicalMeasurement Mass spectrometer Finnigan MAT 251EM ‰ ‰ Silicon dioxide physicalMeasurement Electron microprobe (EMP); Weight % % % Aluminium oxide physicalMeasurement Electron microprobe (EMP); Weight % % % Sodium oxide physicalMeasurement Electron microprobe (EMP); Weight % % % Potassium oxide physicalMeasurement Electron microprobe (EMP); Weight % % % Magnesium oxide physicalMeasurement Electron microprobe (EMP); Weight % % % Calcium oxide physicalMeasurement Electron microprobe (EMP); Weight % % % Manganese oxide physicalMeasurement Electron microprobe (EMP); Weight % % % Iron oxide, FeO physicalMeasurement Electron microprobe (EMP); Weight % % % Phosphorus pentoxide physicalMeasurement Electron microprobe (EMP); Weight % % % Sulfite physicalMeasurement Electron microprobe (EMP); Weight % % % Titanium dioxide physicalMeasurement Electron microprobe (EMP); Weight % % % text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.811050?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: Dabashan_Foreland_Belt * LATITUDE START: 31.350000 * LONGITUDE START: 107.617500 * LATITUDE END: 32.522500 * LONGITUDE END: 108.535000 * DATE/TIME START: 2008-06-04T00:00:00 * DATE/TIME END: 2008-07-19T00:00:00 * LOCATION: Sichuan, Shaanxi, China * METHOD/DEVICE: Sampling by hand 2008-06-04T00:00:00