Sr isotopic and elemental characteristics of calcites in the Chinese deserts: Implications for eolian Sr transport and seawater Sr evolution

Rao, Wenbo; Chen, Jun; Jun, Yang; Ji, Junfeng; Zhang, Gengxin

doi:10.1016/j.gca.2009.06.028

Cited by 37 publications

(14 citation statements)

References 84 publications

(149 reference statements)

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“…The 87 Sr/ 86 Sr ratio of snail in different regions and ages varies from 0.71055 to 0.71117 with the variation of just 0.00062 [21], indicating that stable source of Sr and Ca in soil solution and thus the authigenic carbonate. Under the extreme condition that the 87 Sr/ 86 Sr ratio of detrital carbonate is identical to the average marine carbonate of about 0.7077, lower than that of carbonate in loess and all PSAs [10]; products of silicate weathering have 87 Sr/ 86 Sr ratio identical to the bulk silicate (0.7185) [28] without preferential weathering of micas with high 87 Sr/ 86 Sr ratio [29]; taking the highest 87 Sr/ 86 Sr ratio of snail (0.71117) as that of the soil solution, it can be estimated that at most 32% of Sr in loess soil solution is derived from silicate weathering. The Ca/Sr ratios of detrital carbonate and silicate are about 860 mol/mol [21] and 140 mol/mol [27], respectively.…”

Section: Mineral Contentmentioning

confidence: 87%

“…Asian dust also constitutes an important component of mineral aerosol affecting global water cycle and energy budget [4]. The weathering and dissolution of Asian dust not only absorb atmosphere CO 2 but also provide a vital source of nutrient elements such as Fe and P to the remote marine and terrestrial ecosystems, making it an important part of global elemental cycling [5][6][7] and affecting the paleo-environmental interpretation of the sea water Pb, Nd, Sr isotopic records [8][9][10]. The short-range transported East Asian dust has accumulated huge amount of loess deposits in North China (Figure 1(b)).…”

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confidence: 99%

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Geochemical studies on the source region of Asian dust

Chen

Gao-jun

2011

Sci. China Earth Sci.

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The North China and the neighbouring Mongolia in Asian Interior is characterized by extremely dry climate, resulted in one of the world's major dust emission centres. Deciphering the source region of Asian dust is critical for revealing the mechanism of the dust production, interpreting the paleo-environmental records of eolian deposits, predicting the overall environmental effects of dust, and setting the strategies for the control of contemporary dust storms. This paper summarizes the geochemical methods applied to the source tracing of Asian dust. Nd-Sr isotopes were the most extensively studied source tracer of Asian dust and have been successfully applied in many cases. Geochemistry of detrital monomineral shows great theoretical advantages in source tracing and deserves further studies. The short-range transportation of Chinese loess with direction similar to that of the prevailing near surface wind is revealed. Source tracing also shows that the Asian dust has two ultimate material sources from the northern margin of the Tibetan Plateau and the Central Asian Orogen, which confirms the importance of mountain processes in the production of silt eolian particles. Based on the recent progresses on the source tracing of Asian dust, discussions are expanded on the natural background of Asian dust storms and potential anthropogenic influence, the materials evolution of the source regions of Asian dust and its relationships with climate changes and Tibetan uplift, and the role of Tibetan uplift in the Asian dust system. desert, loess, Asian dust, dust storm, Tibetan Plateau Citation:Chen J, Li G J. Geochemical studies on the source region of Asian dust.

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Section: Mineral Contentmentioning

confidence: 87%

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confidence: 99%

Geochemical studies on the source region of Asian dust

Chen

Gao-jun

2011

Sci. China Earth Sci.

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165

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“…Significantly, eolian dust from inland Asia is characterized by homogeneous Sr isotopic composition with more radiogenic Sr [ Sun , 2002; Jacobson , 2004; Yokoo et al , 2004; Rao et al , 2009]. For example, dust particles finer than 20 μ m have 87 Sr/ 86 Sr of 0.7130 to 0.7142 in the Qaidam Basin and 0.7141 to 0.7145 in the southern Tarim Basin [ Sun , 2002].…”

Section: Discussionmentioning

confidence: 99%

Seasonal contributions of catchment weathering and eolian dust to river water chemistry, northeastern Tibetan Plateau: Chemical and Sr isotopic constraints

Jin

You

et al. 2011

J. Geophys. Res.

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[1] River waters collected weekly over the whole year of 2007 from the Buha River draining to Lake Qinghai on the northeastern Tibetan Plateau were analyzed for major ions and Sr isotopes. Dissolved loads in the river exhibit distinct seasonal variability in major cation ratios and Sr isotopes over the 1 year period, reflecting seasonal differences in relative inputs from various sources and weathering reactions in the catchment. Distinct geochemical signatures suggest that eolian dust may affect river water chemistry significantly, resulting in a twofold increase influx of dissolved loads during spring relative to winter. It is noticeable that both the lowest and the highest 87 Sr/ 86 Sr values of the Buha River waters occurred in the monsoon season, indicating a sensitive response of carbonate versus silicate weathering sources to hydrological forcing on a seasonal basis. A significant decrease in Na/cation, together with lower Sr isotope ratios, is consistent with a greater proportion of carbonate weathering relative to silicate weathering in the early monsoon season. High temperature and increased rainfall during the peak of the monsoon facilitate an increased proportion of ions derived from silicates, partly from groundwaters, to river water. In other seasons, elemental and 87 Sr/ 86 Sr ratios vary much less, indicating a constant ratio of silicate to carbonate weathering, consistent with limited variation in discharge. Our results highlight that in a semiarid region where climatic conditions vary seasonally, in addition to silicate and carbonate contributions, supply from eolian dust may also play a significant role in controlling seasonal variations in chemistry of river waters.

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“…In addition, the uniform Nd isotopic composition since 12 Ma (Pettke et al, 2000), possibly even since the late Eocene (Pettke et al, 2002), precludes a major change in the provenance of the dominant dust component. More recently, Nd-Sr isotopic studies suggest that the dust source region for both the proximal CLP (via near-surface northwest winter monsoon) and the distal North Pacific (via high-altitude westerlies) is the deserts on the northern margin of the Tibetan Plateau, i.e., Taklimakan, Qaidam, Badain Jaran, and Tengger deserts (Chen et al, 2007;Rao et al, 2009). In this paper we refer to this source region as Asian interior.…”

Section: Drying Of the Dust Source Regionmentioning

confidence: 98%