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Geochemical characteristics of the organic matter in UPPMRs and the implication for fluid–rock exchange due to the retrograde metamorphism in the Dabie–Sulu orogenic belt, North China

  • Jin SuEmail author
  • Yu Fang
  • Zhu Rao
  • Jiahu Fang
  • Liu Yang
  • Yi Huang
Article
  • 22 Downloads

Abstract

The samples were collected from ultrahigh-pressure para-metamorphic rocks (UPPMRs) around 500–2000 m deep by Chinese Continental Scientific Drilling. The combined method of ultrasonic disintegrator and Soxhlet was strictly conducted to extract the indigenous hydrocarbons from the UPPMRs, to obtain non-contaminated and entire organic matter to reveal the geochemical characteristics and origin of hydrocarbons in the UPPMRs. Through gas chromatography–mass spectrometry analysis, the ratios of Pr/Ph in the soluble hydrocarbon were from 0.04 to 0.87. It was inferred that the precursor of extracts would be deposited in the anoxic setting. Based on the relative content among C27, C28 and C29 steranes, it was found that the main source of organic matter was marine algae. But the isomer ratios of C31 hopane 22S/(22S + 22R) were 0.39–0.69, and the distribution range of C29 sterane 20S/(20S + 20R) was 0.41–0.63, both of which reflected the equivalent maturity of organic matter was no more than 1% (Ro%). Therefore, the immature organic matter derived from algae obviously conflicted with its host rock, which experienced ultrahigh-pressure metamorphism. Therefore, this sort of immature organic matter probably is of secondary origin. Furthermore, the chromatography of n-alkane almost assumes bimodal distribution, and the data of Tmax ranges from 394 to 565°C, as S1/total organic carbon (TOC) ratios systematically increase with the corresponding Tmax. Therefore, it could be further proved that the organic matter in the UPPMRs probably is of mixed origin and is mainly derived from immigrant hydrocarbons during the stages of subduction and retrograde metamorphism. The emergence of Zr-in-rutile also indicates that the geological temperature was lower than that during the peak of metamorphism. Therefore, it could be inferred that the kerogen associated with rutile might go through diagenesis regularly at the stage of retrograde metamorphism. It was also shown that the δ18O value suddenly reduced up to −10‰ corresponding to the highest TOC (1820 μg/g) around the subduction fault. The relationship between the TOC and δ18O value indicated that the fluid–rock exchange reaction was the main reason for the immature organic matter present in the para-metamorphic rock. The returned subduction and retrograde metamorphism resulted in the activity of the formation fluid, which could prominently impact the geochemical characteristics of the para-metamorphic rock and should also be considered in the geodynamics research of the metamorphic orogenic belt.

Keywords

Ultrahigh-pressure para-metamorphic rock biomarkers oxygen isotopes rutile retrograde metamorphism Dabie–Sulu orogenic belt 

Notes

Acknowledgements

This study was funded by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA14010101) and the projection of Chinese Continental Scientific Drilling (CCSD). The extraction, separation, GC and GC-MS analyses were performed at the National Research Centre of Geoanalysis. The Rock-Eval was conducted in the Key Laboratory of Petroleum Geology (KLPG), PetroChina. The observation of maceral was completed in China University of Mining & Technology, Beijing. We are extremely grateful for the rock samples supplied by Chinese Academy of Geological Science.

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Research Institute of Petroleum Exploration and Development, PetroChinaBeijingPeople’s Republic of China
  2. 2.Chinese Academy of Geological SciencesBeijingPeople’s Republic of China
  3. 3.School of Resources & Safety EngineeringChina University of Mining & TechnologyBeijingPeople’s Republic of China

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