[1]熊平生a,b,王 鹏a*,等.衡阳盆地红土剖面元素地球化学特征及其古环境意义[J].山地学报,2019,(05):693-701.[doi:10.16089/j.cnki.1008-2786.000460]
　XIONG Pingshenga,b,WANG Penga*,et al.Geochemistry of Elements and Its Paleoenvironmental Implications from the Red Earth Profile in the Hengyang Basin[J].Mountain Research,2019,(05):693-701.[doi:10.16089/j.cnki.1008-2786.000460]
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衡阳盆地红土剖面元素地球化学特征及其古环境意义()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2019年05期
页码:
693-701
栏目:
山地环境
出版日期:
2019-09-30

文章信息/Info

Title:
Geochemistry of Elements and Its Paleoenvironmental Implications from the Red Earth Profile in the Hengyang Basin
文章编号:
1008-2786-(2019)5-693-09
作者:
熊平生a; b ;  王 鹏a*;  张 忆b;  张楚楚a
衡阳师范学院 a.城市与旅游学院 湖南 衡阳 421002; b.南岳学院 湖南 衡阳 421000
Author(s):
XIONG Pingshenga; b;  WANG Penga*;  ZHANG Yib;  ZHANG Chuchua
Hengyang Normal University a. College of City and Tourism, Hengyang 421002, Hunan, China; b. College of Nanyue, Hengyang 421000, Hunan, China
关键词:
化学蚀变指数;  元素迁移;  微量元素;  红土;  衡阳盆地
Keywords:
Confidentiality Integrity Availability(CIA);  elements migration;  trace element;  red clay;  Hengyang basin
分类号:
P595~A
DOI:
10.16089/j.cnki.1008-2786.000460
摘要:
为了揭示衡阳盆地红土剖面沉积的古环境信息,对高兴红土剖面进行电子自旋共振(ESR)测年和常量、微量元素测试分析。结果表明:(1)红土剖面常量元素氧化物组成以SiO2、Al2O3、Fe2O3为主,三者含量总和为89.63%。微量元素Rb、Sr、Ba、Cu含量分别与常量元素氧化物K2O、MgO、Na2O、Al2O3含量之间表现出显著的正相关性,Na2O、MgO、K2O、Al2O3含量之间呈显著正相关性,表明它们的活动性相似。(2)高兴剖面绝大多数常量元素氧化物在风化过程中表现为迁移淋失,Fe2O3、SiO2则表现为轻度富集,常量元素的迁移能力大小顺序依次为:K2O>Na2O>MgO>Al2O3>SiO2>Fe2O3。MgO、Na2O、K2O、Al2O3自剖面底部往上迁移程度逐渐减弱的变化趋势,表明沉积时期气候的湿热程度也逐渐减弱。(3)CIA值、Rb/Sr值从剖面顶部往下呈递增的趋势,而微量元素Rb含量、Sr含量、Sr/Cu值、Sr/Ba值呈现相反的变化趋势。CIA值、Rb/Sr值、Sr/Cu值、Sr/Ba值曲线共同印证了2.23 Ma以来的衡阳盆地气候演化特征,即为由炎热潮湿向温暖湿润方向的变化。
Abstract:
Global climate and environmental changes and regional responses are hot topics of widely concerned in Geosciences areas. In order to reveal the paleoenvironmental information of red clay sediments in Hengyang Basin, major elements, trace elements and Electron Spin Resonance(ESR)dating of red clay samples from the Gaoxing profile were measured and analyzed. The results showed that:(1)SiO2, Al2O3 and Fe2O3 were the main components of major element oxides in red clay profile, and their total content was 89.63%. With slightly more than 1%, the contents of MgO, K2O, CaO and Na2O were very low of red clay samples, except K2O was easily adsorbed by red clay. The contents of other soluble components were all less than 1%. The percent contents of trace elements Ba, Cu,Rb and Sr were positively correlated with the contents of major elements K2O, MgO, Na2O and Al2O3 respectively, and the contents of Na2O, MgO, K2O and Al2O3 were positively correlated with each other, indicating that their activities were similar.(2)Geochemical behavior of major element oxides K2O, MgO, Na2O and Al2O3 was characterized by migration and leaching, while the element oxide of SiO2 and Fe2O3 were slightly enriched. Relative migration ability was in the order of K2O>Na2O>MgO>Al2O3>SiO2>Fe2O3. The migration of MgO, Na2O, K2O, Al2O3 from bottom to top of the profile tends to weaken gradually, indicating that the humidity and heat of the climate during the sedimentary period were also weakening gradually.(3)The values of CIA and Rb/Sr increased from top to bottom, while the contents of Rb, Sr, Sr/Cu and Sr/Ba decreased. The CIA value, Rb/Sr value, Sr/Cu value and Sr/Ba value revealed that the climate of Hengyang Basin had evolved from being hot-humid to being warm-wet since 2.23 Ma.

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备注/Memo

备注/Memo:
收稿日期(Received date):2017-04-11; 改回日期(Accepted date):2019-06-30
基金项目(Foundation item):国家自然科学基金资助项目(41471153); 大学生创新创业训练计划项目(201912659001,NYD201905)。[National Natural Science Foundation of China(41471153); University Student Innovation and Entrepreneurship Training Program Project(201912659001, NYD201905)]
作者简介(Biography):熊平生(1972-),男,湖南道县人,博士,副教授,主要研究方向:第四纪地质。[XIONG Pingsheng(1972-), male, born in Daoxian, Hunan province, Ph.D., associate professor, research on quaternary geology ] E-mail: xps19721010@163.com
更新日期/Last Update: 2019-09-30