漢江上游庹家灣剖面化學(xué)風(fēng)化特征及其意義
[Abstract]:Based on the analysis of elements in Tuojiawan loess profile, the geochemical behavior of constant elements in loess and its response to climate change in the upper reaches of Hanjiang River are revealed. The element content and magnetic susceptibility of Tuojiawan profile were measured by XRay fluorescence spectrometer and MS- 2 magnetic susceptibility meter. The experimental results show that the chemical composition of weathering loess in Tuo Jiawan profile is mainly SiO_2,Al_2O_3 and Fe_2O_3. The contents of them were 355.83 g / kg, 79.62 g / kg, 62.64 g / kg, respectively. Using Ti as a reference, Na,Ca,Mg,Si,K showed migration and leaching loss, Fe,Al element was relatively enriched, and the activity of the element and its migration sequence were NaCaMgSiKAlFe;. The content curves of Fe and Al elements and the CIA curves show obvious peaks at the depths of 228 / 260 cm (L_1~S_1) and 294 / 370 cm (L_1~S_2), and are highly consistent with the susceptibility curves. It is indicated that the chemical weathering degree of this layer is obviously higher than that of typical loess, which is close to that of paleosol (S _ (0) 0), OSL age: 27.5 ~ 21.5 ka B.P.) Between. The variation of major elements in Tuojiawan section indicates that the climate at the end of late Pleistocene in the upper reaches of Hanjiang River is not continuously dry and cold, but has some climatic fluctuation, which is in 27.5 ~ 21.5 ka B.P. During the period of weathering and soil formation, the climate is relatively warm and humid.
【作者單位】: 陜西師范大學(xué)旅游與環(huán)境學(xué)院;
【基金】:國家自然科學(xué)基金項(xiàng)目(41271108,41371029) 國家社會(huì)科學(xué)基金項(xiàng)目(14BZS070) 中央高;究蒲匈M(fèi)(GK201601006)~~
【分類號(hào)】:P512.12;P532
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