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九江红土沉积物的铁氧化物矿物学及其对中国南方第四纪气候变化的意义

Fe-oxide mineralogy of the Jiujiang red earth sediments and implications for Quaternary climate change, southern China.

作者信息

Yin Ke, Hong Hanlie, Algeo Thomas J, Churchman Gordon Jock, Li Zhaohui, Zhu Zongmin, Fang Qian, Zhao Lulu, Wang Chaowen, Ji Kaipeng, Lei Weidong, Duan Zhenggang

机构信息

School of Earth Sciences, China University of Geosciences, Wuhan, Hubei, 430074, China.

State Key Laboratory of Geobiology and Environmental Geology, the Ministry of Education, China University of Geosciences, Wuhan, Hubei, 430074, China.

出版信息

Sci Rep. 2018 Feb 26;8(1):3610. doi: 10.1038/s41598-018-20119-4.

DOI:10.1038/s41598-018-20119-4
PMID:29483522
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5832151/
Abstract

Diffuse reflectance spectrophotometry (DRS) is a new, fast, and reliable method to characterize Fe-oxides in soils. The Fe-oxide mineralogy of the Jiujiang red earth sediments was investigated using DRS to investigate the climate evolution of southern China since the mid-Pleistocene. The DRS results show that hematite/(hematite + goethite) ratios [Hm/(Hm + Gt)] exhibit an upward decreasing trend within the Jiujiang section, suggesting a gradual climate change from warm and humid in the middle Pleistocene to cooler and drier in the late Pleistocene. Upsection trends toward higher (orthoclase + plagioclase)/quartz ratios [(Or + Pl)/Q] and magnetic susceptibility values (χ) support this inference, which accords with global climate trends at that time. However, higher-frequency climatic subcycles observed in loess sections of northern China are not evident in the Jiujiang records, indicating a relatively lower climate sensitivity of the red earth sediments in southern China.

摘要

漫反射光谱法（DRS）是一种用于表征土壤中铁氧化物的新型、快速且可靠的方法。利用DRS研究了九江红土沉积物的铁氧化物矿物学，以探究中更新世以来中国南方的气候演变。DRS结果表明，九江剖面内赤铁矿/（赤铁矿+针铁矿）比率[Hm/（Hm+Gt）]呈向上递减趋势，这表明气候从中更新世的温暖湿润逐渐变化到晚更新世的凉爽干燥。向上剖面中（正长石+斜长石）/石英比率[（Or+Pl）/Q]和磁化率值（χ）升高的趋势支持了这一推断，这与当时的全球气候趋势相符。然而，在中国北方黄土剖面中观察到的高频气候亚周期在九江记录中并不明显，这表明中国南方红土沉积物的气候敏感性相对较低。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/0b5173b43915/41598_2018_20119_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/96ec46c2c8d1/41598_2018_20119_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/881bca5c8583/41598_2018_20119_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/70d9d6f51a39/41598_2018_20119_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/be422b5ce626/41598_2018_20119_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/e7ffa9853c1d/41598_2018_20119_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/46fef51d909c/41598_2018_20119_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/0b5173b43915/41598_2018_20119_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/96ec46c2c8d1/41598_2018_20119_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/881bca5c8583/41598_2018_20119_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/70d9d6f51a39/41598_2018_20119_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/be422b5ce626/41598_2018_20119_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/e7ffa9853c1d/41598_2018_20119_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/46fef51d909c/41598_2018_20119_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7a98/5832151/0b5173b43915/41598_2018_20119_Fig8_HTML.jpg

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