Testing Hypotheses for Lithosphere Thinning During Continental Breakup: Drilling at the South China Sea Rifted Margin
Scientific Prospectus＞＞To be published
Exp. 367: Feb 7 – Apr 9, 2017
Exp. 368: Apr 9 – June 9, 2017
Exp. 367: Hong Kong/ Hong Kong
Exp. 368: Hong Kong/ Hong Kong
The two South China Sea (SCS) Rifted Margin Expeditions (based on IODP Proposals 878-CPP and 878-Add) aim to understand the mechanisms of lithosphere extension during continental breakup at a non-volcanic rifted margin.
The SCS margin shows similarities to the hyper-extended Iberia-Newfoundland margins, possibly including exhumed and serpentinized mantle within the Continent-Ocean-Transition (COT). However, modeling studies suggest that there can be mechanisms of plate weakening other than serpentinization of sub-continental lithospheric mantle. Two competing models for plate rupture (in the absence of excessively hot asthenospheric mantle) have widely different predictions for development of the SCS margin.
To discriminate between these models, a series of deep-penetration sites will be drilled across a 150–200 km wide zone of highly extended seaward-thinning crust with a well-imaged COT zone. Coring and logging deep/basal sediments and the underlying basement is the primary objective.
The proposed drill sites determine the nature of crust within the COT and constrain (a) post-breakup crustal subsidence, (b) how soon after breakup igneous crust started to form, (c) timing of rifting, and (d) rate of extension. The science objectives can be effectively addressed at these drill sites because of the existing constraints on SCS formation and stratigraphy that include industry drilling, ODP Leg 184 and IODP Expedition 349 drilling, as well as due to the young (Paleogene) rifting of the margin and absence of excessively thick post-rift sediments.
Science Party from J-DESC
Call for application
Call for application
Requested Science Field
Any field of expertise
15 Jan 2016 extended
29 Feb 2016
Support for Japanese-based IODP Science Party
Invited science party is supported by J-DESC for several years, including:
- Pre-cruise Training：travel support for training before the cruise;
- Expedition：travel support for the expedition;
- After cruise work：analysis during the moratorium; and
- Post-cruise research：Research funding upto three years after the expedition