Lu, Yang; Mihailova, Boriana; Malcherek, Thomas; Paulmann, Carsten; Smrzka, Daniel; Zwicker, Jennifer; Lin, Zhiyong; Bohrmann, Gerhard; Peckmann, Jörn (2024): X-ray diffraction profiles, Raman spectra and carbon and oxygen isotope compositions of fibrous cement from Black Sea seeps [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.964859
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Published: 2024-01-23 • DOI registered: 2024-02-21
Abstract:
The mineral phase of primary marine fibrous carbonate is supposed to be mainly controlled by the Mg/Ca of seawater during precipitation. However, fibrous Mg calcite was identified from seep carbonates in the Black Sea, although the high Mg/Ca of the Black Sea seawater should promote the precipitation of aragonite. The unexpected formation of fibrous Mg calcite indicates additional factors other than Mg/Ca. In order to clarify the factors, we studied seep carbonates from the Black Sea. Points of interest were selected by observation under a microscope. Main compositions of the points were measured by an energy-dispersive X-ray spectroscope. Mineral structure and spectroscopy characteristics were analysed by X-ray diffraction and Raman, respectively, and converted to MgCO₃ contents according to empirical formulas. Carbon and oxygen isotope compositions of fibrous carbonate minerals were measured by an isotope ratio mass spectrometer. The results suggest that the fibrous Mg calcite from the Black Sea were formed by sulphide-driven anaerobic oxidation of methane under reducing conditions, which contributes to the understanding of the formation of Neoproterozoic fibrous dolomite.
Related to:
Lu, Yang; Mihailova, Boriana; Malcherek, Thomas; Paulmann, Carsten; Smrzka, Daniel; Zwicker, Jennifer; Lin, Zhiyong; Bohrmann, Gerhard; Peckmann, Jörn (2023): Role of bottom water chemistry in the formation of fibrous magnesium calcite at methane seeps in the Black Sea. Sedimentology, sed.13170, https://doi.org/10.1111/sed.13170
Coverage:
Median Latitude: 44.207533 * Median Longitude: 33.857992 * South-bound Latitude: 44.016000 * West-bound Longitude: 30.087000 * North-bound Latitude: 44.778000 * East-bound Longitude: 36.690000
Date/Time Start: 2005-06-15T01:00:00 * Date/Time End: 2005-06-15T03:23:00
Minimum Elevation: -2004.0 m * Maximum Elevation: -120.0 m
Event(s):
GeoB9908-1 (BS346GR) * Latitude Start: 44.016000 * Longitude Start: 36.689167 * Latitude End: 44.018833 * Longitude End: 36.690000 * Date/Time Start: 2005-06-15T01:00:00 * Date/Time End: 2005-06-15T03:23:00 * Elevation Start: -1985.0 m * Elevation End: -2004.0 m * Location: Dolgovskoy mound * Campaign: TTR-15 * Basis: Professor Logachev * Method/Device: Television-Grab (TVG) * Comment: 0,5 t
MEGASEEBS_1993 (Methane Gas Seep Explorations in the Black Sea) * Latitude: 44.778000 * Longitude: 31.965800 * Elevation: -190.0 m * Location: Ukrainian shelf * Method/Device: Beam trawl (BEAM) * Comment: Carbonate rock samples. Ukrainiab slope seep carbonates, BS M
POS201/6,7_UBS1 * Latitude: 44.017300 * Longitude: 30.087000 * Elevation: -120.0 m * Location: Romanian shelf * Campaign: POS201/6,7 (PO201F,G) * Basis: Poseidon * Method/Device: Beam trawl (BEAM) * Comment: Romanian shelf near the Vityaz Canyon, geograpical position estimated from literature
Comment:
Funding information:
K. C. Wong Education Foundation: http://dx.doi.org/10.13039/501100012692
Guangzhou Elite Project (No. JY201223)
Open Access Publication Fund of Universität Hamburg: http://dx.doi.org/10.13039/501100005711
Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Basic curation (CurationLevelB)
Size:
10 data points
Data
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| 1 Binary | 2 Content |
|---|---|
| 1_Sample_information.xlsx | Sample information |
| 2_EDX_results.xlsx | Energy-dispersive X-ray spectroscopy (EDX). Samples was made into thin sections with polished surface, which were uncoated. Each point of interest accumulated over 10000 counts. |
| 3_XRD_results.xlsx | X-ray diffraction. Powder sample were loaded on the sample stage and align to the X-ray beam. The scan was from 5° to 65° 2θ with 1.5° per step. Signals were recorded for 200 seconds at each step. |
| 4_Raman_results.xlsx | Raman spectroscopy. Samples were made into polished thin sections. Points of interest were selected by observation under a microscope. Each spectrum was measure between 15 and 1215 cm-1 by 10 loops. Each loop was collected for 15 seconds. |
| 5_Carbon_oxygen_isotope_compositions.xlsx | Carbon and oxygen isotope compositions. Samples were grinded into powder. About 1 mg powder from each sample was measured by the standard phosphoric acid method. |