Yancheva et al. reply

Yancheva, Gergana; Nowaczyk, Norbert R; Mingram, Jens; Dulski, Peter; Schettler, Georg; Negendank, Jörg F. W.; Liu, Jiaqi; Sigman, Daniel M.; Peterson, Larry C.; Haug, Gerald H.

doi:10.1038/nature06409

Cited by 9 publications

(6 citation statements)

References 5 publications

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“…However, Zhou et al [13] argued that the Ti component in the lake sediments probably come from the local basalts and laterite by comparing the Ti contents of local basalts, laterite and the Chinese loess, so the Ti content might be related to the hydrology of the lake rather than the Asian winter monsoon. Yancheva et al refuted Zhou et al's argument by stating that Zhou et al had ignored the S-ratio and magnetic susceptibility records, and maintained that magnetic property and Ti content could be used as proxies for the intensity of the winter monsoon [14]. In addition, Zhang and Lu argued against the inverse correlation of winter and summer monsoons suggested by Yancheva et al by comparing proxy records of winter monsoon strength from Huguang Maar with historical climate records, which showed a different pattern [15].…”

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confidence: 88%

Magnetic granulometry of recent sediments from the Huguang Maar and its implication for provenience

et al. 2009

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To understand the origin and its climatic implications of the Huguang Maar sediments, we conducted laser grain size analysis and rock mangtic measurement for the recent deposits from the Huguang Maar and for the volcanic rocks of the caldera for comparison. The grain size distributions are dominated by clayey silts for both the bulk sediments and magnetic separates. Acquisition of isothermal remanent magnetization (IRM) and thermal demagnetization of IRM suggest (titano) magnetite as the dominating magnetic mineral in the sediments; high coercivity minerals are not detected. Therefore, the ratio of the susceptibility of anhysteretic remanent magnetization (k ARM ) to the weak field magnetic susceptibility (k), k ARM /k can be used to estimate the grain size of magnetite. The sediments and volcanic rocks yield values of 13.7 and 11.8 for the k ARM /k, respectively, corresponding to grain size values of ~0.03 μm and ~0.05 μm. The magnetic granulometry of lake sediments is distinctive from one of the Chinese loess, in which published data suggest a value of 6.0 for k ARM /k, and grain size of ~0.1 μm, but is akin to the nearby volcanic rocks. Although a Loess Plateau source of the lake sediments cannot be fully ruled out, the catchment is most probably the main source. We explain the slightly finer magnetite grain size in sediments than in the volcanic rocks as being disintegrated of particles during erosion and transportation. We conclude that there is no evidence for aeolian input of the Loess Plateau dusts into the Huguang Maar, and the relationship between magnetic parameters of the lake sediments and winter monsoon intensity is probably more complicated than previously thought.Huguang Maar, grain size, rock magnetism, Asian winter monsoon Citation:Han Y L, Tan X D, Chen Z, et al. Magnetic granulometry of recent sediments from the Huguang Maar and its implication for provenience.

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confidence: 88%

Magnetic granulometry of recent sediments from the Huguang Maar and its implication for provenience

et al. 2009

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“…The overall pattern of vegetation change shows a drying climate trend over the last 6200 years, which is likely in response to weakening summer monsoon as documented by other independent climate records. Modern magnetic susceptibility derived from surface soil in the Tianchi Lake catchment indicated the MS value was contributed by the aeolian input, which was also proved in Lake Huguangyan, a Maar Lake in Guangdong Province [16]. MS at the Tianchi Lake shows a relatively stable state before 2700 Cal a BP, then increasing gradually.…”

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confidence: 96%

High-resolution climate change in mid-late Holocene on Tianchi Lake, Liupan Mountain in the Loess Plateau in central China and its significance

et al. 2010

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According to a core from Tianchi Lake, Liupan Mountain in Loess Plateau sediment, fossil pollen assemblages, magnetic susceptibility (MS) and color scale were measured based on reliable Abies leaf macrofossils radiocarbon chronology. We recovered a very good high-resolution mid-late Holocene climate change achieve for the transition area of the East Asia monsoon region and northwest arid region. The results show that the basic climate background was in agreement with the records from cave records in monsoon regions in eastern China. Besides, it shows more detailed records in abrupt climate change.high resolution, mid-late Holocene, Tianchi Lake

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“…However, this hypothesis was questioned by Zhou et al [2007] that Ti in HGY sediment could have originated from the catchment and thus Ti might be related to paleohydrology of the lake instead. Yancheva et al [2007b] argued that the increased Ti intensity co-occurring with reduced rainfall supported their hypothesis of eolian source. Zhou et al [2009] then showed that 87 Sr/ 86 Sr, 143 Nd/ 144 Nd, and REE of HGY surface sediments are similar to those in local basalt, but obviously different from loess in the CLP.…”

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confidence: 89%

Ti content in Huguangyan maar lake sediment as a proxy for monsoon‐induced vegetation density in the Holocene

Shen

Zhang

et al. 2013

Geophysical Research Letters

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[1] The provenance of element Ti in Huguangyan maar lake (HGY) sediment has been under debate since Yancheva et al. (2007a) proposed its eolian source from the Chinese Loess Plateau (CLP) and applied it as a proxy for Asian winter monsoon. We performed a comprehensive study on Ti-carrying minerals and Ti fluxes in lake sediments, wall rocks, and loess from the CLP. Here we show that the chemical compositions and morphological features of magnetite, the most important Ti carrier in HGY surface sediments, are identical to those in wall rocks around the lake, but substantially different from those in CLP loess samples. Our calculated modern eolian Ti flux from the CLP is negligible compared to the average total Ti flux to HGY, and Ti flux from catchment erosion can provide enough Ti, indicating Ti in HGY sediment are predominantly from wall rock erosion. Inverse correlation between total organic carbon (TOC) (vegetation density) and Ti/Ca ratio (terrestrial input) in the Holocene suggests monsoon-induced vegetation density predominates over runoff in controlling Ti input to HGY. S-ratio represents TOC directly mediated reductive diagenesis of iron oxides (magnetite preservation), rather than anoxic/ oxic condition at the bottom water induced by winter monsoon. Our record shows a decreased vegetation density, increased Ti input and weakened reductive diagenesis through the Holocene driven by a weakened summer monsoon. Citation: Shen, J., X. Wu, Z. Zhang, W. Gong, T. He, X. Xu, and H. Dong (2013), Ti content in Huguangyan maar lake sediment as a proxy for monsoon-induced vegetation density in the Holocene, Geophys.

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Yancheva et al. reply

Cited by 9 publications

References 5 publications

Magnetic granulometry of recent sediments from the Huguang Maar and its implication for provenience

Magnetic granulometry of recent sediments from the Huguang Maar and its implication for provenience

High-resolution climate change in mid-late Holocene on Tianchi Lake, Liupan Mountain in the Loess Plateau in central China and its significance

Ti content in Huguangyan maar lake sediment as a proxy for monsoon‐induced vegetation density in the Holocene

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