Provenance of the north Pacific sediments and process of source material transport as derived from Rb–Sr isotopic systematics

Asahara, Yoshihiro; Tanaka, Tsuyoshi; Kamioka, Hikari; Nishimura, Akira; Yamazaki, T.

doi:10.1016/s0009-2541(99)00056-x

Cited by 99 publications

(67 citation statements)

References 33 publications

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“…In addition, three desert sand and two river sand samples from the northern part of the Taklimakan Desert were examined to complement the limited existing reference data for the Taklimakan Desert sand (Liu et al, 1994;Tanaka et al, 1990). The possible size effects on isotopic ratio and REE concentration are examined in this study for size fractions relatively coarser (from >500 µm to 32-20 µm) than those in previous studies (e.g., Basile et al, 1997 andAsahara et al, 1999 for Sr isotope; Goldstein et al, 1984 andGrousset et al, 1992 for Nd isotope).…”

Section: Samples and Analytical Methodsmentioning

confidence: 99%

Sr and Nd isotope ratios and REE abundances of moraines in the mountain areas surrounding the Taklimakan Desert, NW China.

et al. 2000

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The first systematic data of Sr and Nd isotopic ratios, REE abundances, major element and mineral compositions are reported for the Chinese moraines from the western Kunlun Mts. and southern and northern flanks of the Tianshan Mts. and soils from the Tibet Plateau. This study was conducted in order to characterize the isotopic and geochemical features of these moraines and soils, which are considered as possible sources of the Taklimakan Desert sands. The moraines and the desert sands consist of quartz and feldspar as dominant minerals, but the former have higher clay and mica and lower carbonate mineral abundances than the latter. In spite of the wide variation, average values of most major elements of the moraines are generally similar to those of the Taklimakan Desert sands, except for CaO depletion and K 2 O enrichment in the moraines. Sr and Nd isotopic ratios are also highly variable for moraines, particularly from the Tianshan northern flank, while those for the desert sands show restricted values. In the Sr-Nd isotopic diagram, the Taklimakan Desert sands are plotted in the narrow field overlapped by both the moraine matrices from the western Kunlun Mts. and from the Tianshan southern flank. In addition, it is noted that average value of Nd isotopic ratios for the moraines is clearly higher than those for the desert sands. Two Tibetan soils of this study show wide variation in mineral composition and major element compositions (SiO 2 = 75% and CaO =1.5% for one sample and SiO 2 = 44% and CaO =31.8% for the other). However, Sr isotopic ratios of both soils are similar to those of the desert sands and their Nd isotopic data are slightly smaller than the desert sands. These results suggest moraine matrices from both the western Kunlun Mts. and the Tianshan southern flank and the Tibetan soils as possible sources for the Taklimakan Desert sands.

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Section: Samples and Analytical Methodsmentioning

confidence: 99%

Sr and Nd isotope ratios and REE abundances of moraines in the mountain areas surrounding the Taklimakan Desert, NW China.

et al. 2000

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“…Strontium isotope ratios are also a useful proxy for sediment provenance, especially for distinguishing basic rock provenances from typical continental sources (Asahara et al, 1999;Hemming et al, 2007). Gui et al (1994) (Fig.…”

Section: Provenance Tracing Using Nd and Sr Isotopesmentioning

confidence: 99%

Nd, Sr isotopes and elemental geochemistry of surface sediments from the South China Sea: Implications for Provenance Tracing

Wei

Liu

et al. 2012

Marine Geology

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“…Before chemical analysis, the fine grain-sized sediments were dipped in 0.25 mol/L HCl for 1 h, and then iteratively filtrated and rinsed with distilled water for three times to remove the biogenic carbonate [17]. Finally, the carbonatefree sediments were dried and ground to less than 200 mesh for major-element measurement.…”

Section: Materials and Analytical Techniquesmentioning

confidence: 99%

“…Because biogenic carbonate has been removed from the fine grain-sized sediments, it is generally accepted that residual carbonate-free detritus consists of silicate, a small quantity of ferromanganese oxide, and biogenic silicon [12,17], whereas the fine grain-sized silicate detritus is predominantly composed of terrestrial materials from rivers and volcanic ash [14,[18][19][20]. Therefore, three factors were associated with sources according to the geochemical characteristics of major elements and the exclusivity of element association in the geological process.…”

Section: Extraction Of the Terrestrial Factor For Fine Grainsized Carmentioning

confidence: 99%

Evolution of the East Asian monsoon and its response to uplift of the Tibetan Plateau since 1.8 Ma recorded by major elements in sediments of the South China Sea

et al. 2011

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Evolution of the East Asian monsoon and its response to uplift of the Tibetan Plateau has been investigated in the study of global change. Core sediment samples drilled in the South China Sea during ODP Leg184 are the best materials for studying long-term variability of the East Asian monsoon. R-mode factor analysis of major elements in the fine grain-sized carbonate-free sediments (<4 μm) of the upper 185 mcd splice of ODP Site 1146 drilled during Leg184 in the South China Sea shows that Ti, TFe 2 O 3 , MgO, K 2 O, P, CaO, and Al 2 O 3 are representative of a terrestrial factor. The variation in the terrestrial factor score is subject to chemical erosion in the source region and thus indicates the evolution of the East Asian summer monsoon. The terrestrial factor score has three stepwise decreases at ~1.3 Ma, ~0.9 Ma, and ~0.6 Ma, indicating the phased weakening of the East Asian summer monsoon is related to wholly stepwise, quick uplifts of the Tibetan Plateau since 1.8 Ma. The periodic fluctuation of the terrestrial factor score since ~0.6 Ma indicates that the glacial-interglacial cycles have been the main force driving the evolution of the East Asian monsoon. As in the case of Chinese loess, the long-term evolution of the East Asian monsoon recorded in sediments of the South China Sea reflects a coupled effect of the glacial-interglacial cycle and uplift of the Tibetan Plateau.

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Provenance of the north Pacific sediments and process of source material transport as derived from Rb–Sr isotopic systematics

Cited by 99 publications

References 33 publications

Sr and Nd isotope ratios and REE abundances of moraines in the mountain areas surrounding the Taklimakan Desert, NW China.

Sr and Nd isotope ratios and REE abundances of moraines in the mountain areas surrounding the Taklimakan Desert, NW China.

Nd, Sr isotopes and elemental geochemistry of surface sediments from the South China Sea: Implications for Provenance Tracing

Evolution of the East Asian monsoon and its response to uplift of the Tibetan Plateau since 1.8 Ma recorded by major elements in sediments of the South China Sea

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