The thermal imprint of continental breakup during the formation of the South China Sea
| Autor: | Geoffroy Mohn, Michael Nirrengarten, Laura Gutiérrez-García, Andrea Schito, Frank Despinois, Stephen A. Bowden, Sveva Corrado |
|---|---|
| Přispěvatelé: | Laboratoire Géosciences et Environnement Cergy (GEC), Fédération INSTITUT DES MATÉRIAUX DE CERGY-PONTOISE (I-MAT), Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine, Université Paris-Seine, Università degli Studi Roma Tre, Nirrengarten, M., Mohn, G., Schito, A., Corrado, S., Gutierrez-Garcia, L., Bowden, S. A., Despinois, F. |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
IODP 367-368
010504 meteorology & atmospheric sciences Geochemistry SE China Margin 010502 geochemistry & geophysics 01 natural sciences Sedimentary depositional environment Geochemistry and Petrology Lithosphere Earth and Planetary Sciences (miscellaneous) Sedimentary organic matter 14. Life underwater thermal evolution ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics geography geography.geographical_feature_category Sedimentary basin International Ocean Discovery Program Seafloor spreading Geophysics 13. Climate action Space and Planetary Science Magmatism Upwelling continental breakup Geology |
| Zdroj: | Earth and Planetary Science Letters Earth and Planetary Science Letters, Elsevier, 2020, 531, pp.115972. ⟨10.1016/j.epsl.2019.115972⟩ |
| ISSN: | 0012-821X |
| DOI: | 10.1016/j.epsl.2019.115972⟩ |
| Popis: | 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 breakup. 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. |
| Databáze: | OpenAIRE |
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