The thermal imprint of continental breakup during the formation of the South China Sea

Michael Nirrengarten* (Corresponding Author), Geoffroy Mohn, Andrea Schito, Sveva Corrado, Laura Gutiérrez-García, Stephen Bowden, Frank Despinois

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The stretching of continental lithosphere results in asthenospheric upwelling, raising of isotherms, melting during decompression and eventually seafloor spreading. The thermal maturity of overlying sedimentary organic matter from these settings would be expected to be distinctly altered by these processes, however this is still poorly constrained and quantitatively unexplored. International Ocean Discovery Program (IODP) Expeditions 367-368 cored sediments at the Continent Ocean Transition (COT) on the Northern Margin of the South China Sea (SCS). From two settings at the South East China COT we measured and modelled thermal maturity in pre-/syn- to post-rift sediments making use of a range of thermal maturity parameters. Various heat-flow evolutionary scenarios were investigated, with notable jumps in thermal maturity for sediments corresponding to different depositional packages. In order to match observations of thermal maturity, it was found that the deeper and likely pre-rift sediments were heated to temperatures as high as 200°C during initial break up. Achieving this temperature for the deeper sediments requires that significant additional heat be imparted at shallow depths (e.g. exposure to at least the far-field effects of a magmatic intrusion or subsurface expressions of volcanism). The post-rift sediments have lower thermal maturities which are likely due to limited burial and the absence of late post-rift magmatism. The comparison of the SE China COT with other margin examples highlights some parameters controlling the thermal evolution and its record.
Original languageEnglish
Article number115972
JournalEarth and Planetary Science Letters
Volume531
Early online date6 Dec 2019
DOIs
Publication statusE-pub ahead of print - 6 Dec 2019

Fingerprint

continental breakup
thermal maturity
China
sediments
ocean-continent transition
Sediments
oceans
continents
sediment
margins
expeditions
seafloor spreading
continental lithosphere
thermal evolution
pressure reduction
upwelling water
decompression
intrusion
lithosphere
heat transmission

Keywords

  • continental breakup
  • thermal evolution
  • SE China distal margin
  • IODP
  • organic petrography
  • Raman spectroscopy
  • biomarker analysis
  • SE China Margin
  • IODP 367-368

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Nirrengarten, M., Mohn, G., Schito, A., Corrado, S., Gutiérrez-García, L., Bowden, S., & Despinois, F. (2020). The thermal imprint of continental breakup during the formation of the South China Sea. Earth and Planetary Science Letters, 531, [115972]. https://doi.org/10.1016/j.epsl.2019.115972

The thermal imprint of continental breakup during the formation of the South China Sea. / Nirrengarten, Michael (Corresponding Author); Mohn, Geoffroy; Schito, Andrea; Corrado, Sveva ; Gutiérrez-García, Laura; Bowden, Stephen; Despinois, Frank.

In: Earth and Planetary Science Letters, Vol. 531, 115972, 01.02.2020.

Research output: Contribution to journalArticle

Nirrengarten, M, Mohn, G, Schito, A, Corrado, S, Gutiérrez-García, L, Bowden, S & Despinois, F 2020, 'The thermal imprint of continental breakup during the formation of the South China Sea', Earth and Planetary Science Letters, vol. 531, 115972. https://doi.org/10.1016/j.epsl.2019.115972
Nirrengarten, Michael ; Mohn, Geoffroy ; Schito, Andrea ; Corrado, Sveva ; Gutiérrez-García, Laura ; Bowden, Stephen ; Despinois, Frank. / The thermal imprint of continental breakup during the formation of the South China Sea. In: Earth and Planetary Science Letters. 2020 ; Vol. 531.
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abstract = "The stretching of continental lithosphere results in asthenospheric upwelling, raising of isotherms, melting during decompression and eventually seafloor spreading. The thermal maturity of overlying sedimentary organic matter from these settings would be expected to be distinctly altered by these processes, however this is still poorly constrained and quantitatively unexplored. International Ocean Discovery Program (IODP) Expeditions 367-368 cored sediments at the Continent Ocean Transition (COT) on the Northern Margin of the South China Sea (SCS). From two settings at the South East China COT we measured and modelled thermal maturity in pre-/syn- to post-rift sediments making use of a range of thermal maturity parameters. Various heat-flow evolutionary scenarios were investigated, with notable jumps in thermal maturity for sediments corresponding to different depositional packages. In order to match observations of thermal maturity, it was found that the deeper and likely pre-rift sediments were heated to temperatures as high as 200°C during initial break up. Achieving this temperature for the deeper sediments requires that significant additional heat be imparted at shallow depths (e.g. exposure to at least the far-field effects of a magmatic intrusion or subsurface expressions of volcanism). The post-rift sediments have lower thermal maturities which are likely due to limited burial and the absence of late post-rift magmatism. The comparison of the SE China COT with other margin examples highlights some parameters controlling the thermal evolution and its record.",
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