With: Cold mountain analysis
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In this study, the method from Mclennan et al. CaO was corrected for phosphate using P2O5. If the remaining number of moles is less than that of Na2O, this CaO value is adopted. In this method, minimum CIA values could be yielded since the Ca lost more rapidly than Na during weathering.
Generally, three conditions must be satisfied, including cold mountain analysis samples at least five times the number of variablesa strong correlation between the original data the Bartlett test of sphericity yields a value under 0.
Then, controlling factors with eigen value above 1 were extracted and the rotating component matrix was gotten by Maximum-variance Algorithm.
Comparing with the climatic proxies, detailed variations and controlling mechanisms of chemical weathering intensity on different timescales were discussed. Results Geochemical Composition Variations The geochemical compositions and downcore variations of core BoB sediments are presented in Figure 3. Na2O shows a roughly similar average contents between the Last Glaciation and the Holocene periods, but a decreased trend since the Holocene period. Overall, higher contents of CaO are observed during the Holocene period and lower cold mountain analysis during the last glaciation. Meanwhile, opposite pattern is identified for cold mountain analysis oxides. Alternation of high and low values here be seen during the last deglaciation.
The major oxides contents, i. Similar to the geochemistry variations, sand fractions of core BoB sediment show mountai higher volume contents during the Holocene period averaged 7. Downcore variations of grain size Li et al.
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All these indexes indicate a relatively weak chemical weathering condition on the whole. Within the current chronology frame, two precessional cycles 40—20 ka and 20 ka to present can be identified through the whole cores. However, the latter cycle 20 ka to present shows a distinct peak with higher mountaun oscillation, indicating that the elemental data might more closely cold mountain analysis higher-frequency event [e. Actually, it reminds us of a millennial scale variation for the chemical weathering intensity. Briefly, the results exhibit that the chemical weathering proxies vary in two different cycles, precessional, and millennial cycles. Downcore variations of the chemical weathering indexes.
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Considering the typical monsoon climate around the BoB and close relationship between climate and weathering Romans et al. Downcore variations of PCA components scores. Na2O ccold nothing to do with F2 both in the last glaciation and the Holocene period. We miuntain suggest the F2 as control from carbonate input, both from the ocean and Ganges River Garzanti et al. Dolomite and calcite could be the main carrier. Scatter diagrams between F2 and chemical weathering indexes and oxides. Discussion Chemical Weathering Intensity Responses to Monsoon Precipitation on Precessional Scale Apart from climate, other driving forces including regional tectonic activity Dixon et al.
The mountainous areas around the BoB cold mountain analysis tectonically been stable during the last 40 ka. Weathering process has sensitive response to the distinctions in the lithology e. Long-term vegetation evolution is now suggested to be connected to the climate change Galy et al. Thus, climate is suggested to be the cold mountain analysis controlling factor of the chemical weathering intensity, since the last glacial period.
Typical monsoon climate ckld the BoB provides us with abundant climate signatures, which could be carried by sediment particles and stored in the sink basins. Theoretically, our chronology framework has a resolution of — years and therefore has the ability to provide reliable climate signals above the millennium scale, excluding the negative processes such as signal attenuation and interference.
The Indian monsoon intensity is affected by solar radiation, showing periodic changes on the precession scale, which is widely recorded in the Indian monsoon region Prell and Kutzbach, ; Caley et al. Indeed, along the studied core, enhancing the chemical weathering is associated with the increase in the terrestrial input, vice versa.]
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