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Wan, Shiming; Tian, Jun; Steinke, Stephan; Li, Anchun; Li, Tiegang (2010): Pliocene clay minerals of ODP Site 184-1143. PANGAEA,, Supplement to: Wan, S et al. (2010): Evolution and variability of the East Asian summer monsoon during the Pliocene: Evidence from clay mineral records of the South China Sea. Palaeogeography, Palaeoclimatology, Palaeoecology, 293(1-2), 237-247,

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The Late Pliocene is thought to be characterized by the simultaneous intensification of both the East Asian winter monsoon (EAWM) and East Asian summer monsoon (EASM). However, the evolution of the EASM during the Pliocene remains still controversial and only little is known about the dynamics of the EASM during the Pliocene on orbital time scales. Here we use clay mineral assemblages in sediments from Ocean Drilling Program (ODP) Site 1143 in the southern South China Sea (SCS) to obtain proxy records of past changes in the EASM climate during the Pliocene. Provenance analysis suggests that illite, chlorite and kaolinite originated mainly from the Mekong River drainage area. Smectite was derived mainly from the Indonesian islands. The kaolinite/illite ratio and the chemical index of alteration (CIA) of siliciclastic sediments allowed us to reconstruct the history of chemical weathering and physical erosion of the Mekong River drainage area and thus, the evolution of the EASM during the Pliocene. Our clay minerals proxy data suggests a stronger EASM during the Early Pliocene than during the Late Pliocene. We propose that the long-term evolution of the EASM has been driven by global cooling rather than the uplift of the Tibetan Plateau. Spectral analysis of kaolinite/illite ratio displays a set of strong periodicities at 100 ka, 30 ka, 28 ka, 25 ka, and 22 ka, with no clear obliquity-related signal. Our study suggests that the Pliocene EASM intensity on orbital time scales is not only controlled by the Northern Hemisphere summer insolation, but also strongly influenced by equatorial Pacific ENSO-like ocean-atmosphere dynamics.
Latitude: 9.361933 * Longitude: 113.285133
Date/Time Start: 1999-03-03T00:00:00 * Date/Time End: 1999-03-10T00:00:00
Minimum DEPTH, sediment/rock: 115.34 m * Maximum DEPTH, sediment/rock: 190.77 m
184-1143 * Latitude: 9.361933 * Longitude: 113.285133 * Date/Time Start: 1999-03-03T00:00:00 * Date/Time End: 1999-03-10T00:00:00 * Elevation: -2772.3 m * Penetration: 1158.2 m * Recovery: 1101.8 m * Location: South China Sea * Campaign: Leg184 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 126 cores; 1158.2 m cored; 0 m drilled; 95.1% recovery
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmGeocode
2AGEAgeka BPGeocode
3Sample code/labelSample labelWan, ShimingDSDP/ODP/IODP sample designation
4SmectiteSme%Wan, ShimingX-ray diffraction (XRD)
5IlliteIll%Wan, ShimingX-ray diffraction (XRD)
6KaoliniteKln%Wan, ShimingX-ray diffraction (XRD)
7ChloriteChl%Wan, ShimingX-ray diffraction (XRD)
8Illite, chemical indexIll chem indexWan, Shimingsee reference(s)
9Illite, full width at half maximum, 10ÅIll FWHMWan, Shimingsee reference(s)
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