Mineralogy and Sedimentology of Pleistocene Sediment in the South China Sea (ODP Site 1144)

Boulay, Sébastien; Colin, Christian; Trentesaux, Alain; Pluquet, F.; Bertaux, Jacques; Blamart, T.; Buehring, C.; Wang, P.

doi:10.2973/odp.proc.sr.184.211.2003

Cited by 85 publications

(113 citation statements)

References 20 publications

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“…The clay particles were found to be mainly continental clastics and their post deposition diagenesis is considered negligible. Previous studies on clay minerals from ODP Sites 1144, 1145, and 1146 collected from the northern slope of the South China Sea reached the same conclusion [12,16,23] . Following a similar procedure as for the three ODP sites, preparation and analyses of the samples were performed at the Laboratoire de Sédimentologie et Géodynamique, Université des Sciences et Technologies de Lille, France.…”

Section: Methodssupporting

confidence: 59%

“…The sampling is representative of the whole Pearl River estuary ( Figure 1, Table 1). In addition, Holocene clay mineral data at ODP Site 1144 (20°3.18'N, 117°25.14'E, water depth 2037 m) [16] , Site 1145 (19°35.04'N, 117°37.86'E, water depth 3157 m) [23] , and Site 1146 (19°27.40'N, 116°16.37'E, water depth 2092 m) [12] are included in the discussion of the provenance of clay minerals deposited on the northern slope of the South China Sea.…”

Section: Methodsmentioning

confidence: 99%

“…The less investigated clay mineral assemblage in major rivers surrounding the South China Sea, however, has resulted in important contradictions in the implication of clay minerals in the study on the East Asian monsoon evolution. For example, on basis of the study on ODP Site 1144 in the northern South China Sea, Tamburini et al [15] and Boulay et al [16] considered that clay minerals at this site derived mainly from the Pearl River, and therefore deduced that the Pearl River provided most of the terrigenous load to this site. Wehausen and Brumsack [6] also obtained a similar result on basis of an elemental geochemical study at nearby ODP Site 1145.…”

mentioning

confidence: 99%

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Clay minerals in surface sediments of the Pearl River drainage basin and their contribution to the South China Sea

et al. 2007

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Clay minerals have played a significant role in the study of the East Asian monsoon evolution in the South China Sea by being able to track oceanic current variations and to reveal contemporaneous paleoclimatic changes prevailing in continental source areas. As one of the most important rivers inputting terrigenous matters to the northern South China Sea, the Pearl River was not previously paid attention to from the viewpoint of clay mineralogy. This paper presents a detailed study on clay minerals in surface sediments collected from the Pearl River drainage basin (including all three main channels, various branches, and the Lingdingyang in the estuary) by using the X-ray diffraction (XRD) method. The results indicate that the clay mineral assemblage consists dominantly of kaolinite (35%-65%), lesser abundance of chlorite (20%-35%) and illite (12%-42%), and very scare smectite occurrences (generally <5%). Their respective distribution does not present any obvious difference throughout the Pearl River drainage basin. However, downstream the Pearl River to the northern South China Sea, the clay mineral assemblage varies significantly: kaolinite decreases gradually, smectite and illite increase gradually. Additionally, illite chemistry index steps down and illite crystallinity steps up. These variations indicate the contribution of major kaolinite, lesser illite and chlorite, and very scarce smectite to the northern South China Sea from the Pearl River drainage basin. The maximum contribution of clay minerals from the Pearl River is 72% to the northern margin and only 15% to the northern slope of the South China Sea. In both glacials and interglacials, kaolinite indicates that the ability of mechanical erosion occurred in the Pearl River drainage basin. clay minerals, surface sediments, provenance, East Asian monsoon, Pearl River drainage basinThe East Asian monsoon is a significant component of the global climate system [1] . Following the successful study on deep-sea sedimentary records of the South Asian monsoon evolution in the Arabian Sea [2] , the South China Sea is becoming an international oceanic location for the study on the East Asian monsoon evolution [3] . Specially, the Ocean Drilling Program (ODP) Leg 184 [4] , which was carried out successfully in the South China Sea in 1999, has impelled the study on the East Asian monsoon evolution not only in micropaleontology and oxygen isotope stratigraphy in the past [5] , but also in sedimentology and sedimentary geochemistry [6,7] .

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Section: Methodssupporting

confidence: 59%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Clay minerals in surface sediments of the Pearl River drainage basin and their contribution to the South China Sea

et al. 2007

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“…ODP Site 1145, relatively close to Luzon, contains the highest smectite content [15]. [18], those of ODP Site 1145 after [15], and those of ODP Site 1146 after [12]. Age models of the three ODP sites are based on their own oxygen isotopes.…”

Section: Time Series Clay Mineral Assemblage and Its Comparison With mentioning

confidence: 99%

“…Those results showed that the time series variation in late Quaternary clay mineral assemblages presents mostly glacialinterglacial cyclicity, and they were interpreted either as chemical weathering closely related to contemporaneous climatic changes of source areas or as oceanic current transport. For example, variations in clay mineral assemblages on the northern slope of the SCS have been suggested to be related to oceanic surface currents that are reversed between winter and summer [12,16,17], or to the contemporaneous chemical weathering of source areas forced by the East Asian monsoon rainfall [13,15,18]. Studies in the southern SCS considered chemical weathering driven by contemporaneous climatic changes of source areas to be the major mechanism, with a case study off the Mekong River mouth showing that the Mekong River basin serves as the major provenance of the southwestern SCS [14,19].…”

mentioning

confidence: 98%

A high-resolution clay mineralogical record in the northern South China Sea since the Last Glacial Maximum, and its time series provenance analysis

Liu

Colin

et al. 2010

Chin. Sci. Bull.

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High-resolution clay mineralogical analysis of Core MD05-2904 in the northern South China Sea (SCS) covering the period since the Last Glacial Maximum shows that illite (29%-48%), smectite (14%-45%), chlorite (17%-28%), and minor kaolinite (6%-14%) comprise the clay mineral assemblage, and that time series variation does not present glacial-interglacial cyclicity. Provenance analysis indicates three end-member sources: almost all smectite derives from Luzon, all kaolinite is sourced from the Pearl River, and illite and chlorite originate from both the Pearl River and Taiwan. By comparing clay mineral compositions in surface sediments from the three major source areas and of the SCS, we reconstructed a time series of clay mineral contribution from the major provenances to the northern slope of the SCS using the linear separation method for illite crystallinity. There were three stages of provenance change. (1) During 24.1-17.5 ka BP, contributions from Taiwan and Luzon were similar (30%-40%), while that from the Pearl River was only 25%. (2) During 17.5-14.0 ka BP, the contribution from Luzon decreased rapidly to 20%-25%, while that from Taiwan increased to 35% from an average of 25% at 18 ka BP, and that from the Pearl River increased largely to 40%. (3) During the Holocene, differences in contributions from the three major provenances increased: the contribution from Luzon increased slightly and then remained at 27%-35%, that from Taiwan increased rapidly and then remained at 55%-60%, and that from the Pearl River decreased to 15%. The change in clay mineral contributions from different provenances is influenced mainly by clay mineral production, monsoon rainfall denudation, oceanic current transport, and sea-level change.clay minerals, illite crystallinity, provenance, Last Glacial Maximum, sea level change, East Asian monsoon, South China Sea Citation:Liu Z F, Li X J, Colin C, et al. A high-resolution clay mineralogical record in the northern South China Sea since the Last Glacial Maximum, and its time series provenance analysis.

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Late Quaternary Deep Stratification‐Climate Coupling in the Southern Ocean: Implications for Changes in Abyssal Carbon Storage

Wang

Wei

et al. 2018

Geochem Geophys Geosyst

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The Southern Ocean plays an important role in modulating Pleistocene atmospheric CO2 concentrations, but the underlying mechanisms are not yet fully understood. Here, we report the laser grain‐size distribution and Mn geochemical data of a 523 kyr‐long sediment record (core ANT30/P1‐02 off Prydz Bay; East Antarctica) to trace past physical changes in the deep Southern Ocean. The core sediments are predominantly composed of clay and silt‐sized material. Three grain size end‐members (EM) as well as three sensitive grain size classes (SC) were discerned, interpreted as Ice Rafted Debris (EM1 and SC1), and coarse (EM2 and SC2) and fine (EM3, SC3) materials deposited from bottom nepheloid layers, respectively. Ratios of EM2/(EM2 + EM3) and SC2/SC3 reveal changes in the local bottom current strength, which is related to the deep ocean diapycnal mixing rate, showing higher values during interglacial periods and lower values during glacial periods. MnO was enriched at each glacial termination, probably caused by abrupt elevations in Antarctic bottom water (AABW) formation rate. Lower AABW formation rate and reduced deep diapycnal mixing during glacial periods enhanced deep Southern Ocean stratification, contributing to glacial atmospheric CO2 drawdown. The elevated AABW formation and enhanced deep diapycnal mixing during glacial terminations alleviated such deep stratification, promoting deeply sequestered CO2 to outgas.

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Mineralogy and Sedimentology of Pleistocene Sediment in the South China Sea (ODP Site 1144)

Cited by 85 publications

References 20 publications

Clay minerals in surface sediments of the Pearl River drainage basin and their contribution to the South China Sea

Clay minerals in surface sediments of the Pearl River drainage basin and their contribution to the South China Sea

A high-resolution clay mineralogical record in the northern South China Sea since the Last Glacial Maximum, and its time series provenance analysis

Late Quaternary Deep Stratification‐Climate Coupling in the Southern Ocean: Implications for Changes in Abyssal Carbon Storage

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