地理科学进展 ›› 2015, Vol. 34 ›› Issue (7): 909-917.doi: 10.18306/dlkxjz.2015.07.012
收稿日期:
2014-11-01
修回日期:
2015-04-01
出版日期:
2015-07-10
发布日期:
2015-07-10
通讯作者:
钟巍
作者简介:
作者简介:魏志强(1989-),男,广东梅州人,硕士生,主要从事全球变化与环境信息系统研究,E-mail:
基金资助:
Zhiqiang WEI, Wei ZHONG*(), Yongqiang CHEN, Lingling TAN
Received:
2014-11-01
Revised:
2015-04-01
Online:
2015-07-10
Published:
2015-07-10
Contact:
Wei ZHONG
摘要:
湖沼沉积物地球化学元素对地球气候环境变化敏感性强。本文以江西定南大湖湖沼沉积物地球化学元素为研究对象,使用主成分分析法,并结合总有机碳(TOC)、有机碳同位素(δ13Corg)、中值粒径(Md)、化学蚀变指数(CIA)等相关气候代用指标,以元素组对的形式阐释不同地化元素响应不同气候环境下的地球化学行为和迁移规律。研究结果显示:第一主成分(PC1)包括Al2O3、TiO2、SiO2、Nb、Rb、Ga、Ba、S等元素,曲线变化与CIA相似,指示湖泊流域的化学风化强度,气候暧湿,PC1含量高;第二主成分(PC2)包括Co、Zr、Hf元素,曲线变化与中值粒径较为一致,指示湖泊流域的水动力条件,气候冷干,PC2含量高;第三主成分(PC3)包括Sc、Cu、U、V元素,曲线变化与TOC、δ13Corg含量变化一致。大湖沉积物的物质来源为:在气候暧湿、流域化学风化作用强的条件下,地表径流冲刷流域周边花岗岩风化壳物质并搬运至湖盆沉积,但不排除在冷干时期,风力携带粉尘物质堆积的影响,粉尘物质可能主要源于周边的风化碎屑物。
魏志强, 钟巍, 陈永强, 谭玲玲. 亚热带季风区湖沼流域表生地球化学元素研究——以江西定南大湖为例[J]. 地理科学进展, 2015, 34(7): 909-917.
Zhiqiang WEI, Wei ZHONG, Yongqiang CHEN, Lingling TAN. Supergene geochemical elements of swampy basin in the subtropical monsoon region: a case study of Dingnan Dahu in Jiangxi Province[J]. PROGRESS IN GEOGRAPHY, 2015, 34(7): 909-917.
表2
定南大湖主成分元素的相关系数表"
Al2O3 | SiO2 | TiO2 | Rb | Ga | Ba | Pb | CaO | S | Co | Zr | Hf | Ce | Nb | Sc | V | U | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
SiO2 | 0.853** | ||||||||||||||||
TiO2 | 0.897** | 0.770** | |||||||||||||||
Rb | 0.880** | 0.765** | 0.757** | ||||||||||||||
Ga | 0.970** | 0.791** | 0.912** | 0.791** | |||||||||||||
Ba | 0.852** | 0.696** | 0.690** | 0.753** | 0.851** | ||||||||||||
Pb | 0.824** | 0.715** | 0.771** | 0.856** | 0.738** | 0.546** | |||||||||||
CaO | -0.958 | -0.937** | -0.863** | -0.874** | -0.905** | -0.780** | -0.820** | ||||||||||
S | -0.892 | -0.938** | -0.816** | -0.783** | -0.828** | -0.665** | -0.780** | 0.938** | |||||||||
Co | -0.311** | -0.315** | -0.262* | 0.060 | -0.428** | -0.563** | 0.130 | 0.297* | 0.257* | ||||||||
Zr | -0.280* | -0.19096 | -0.15842 | -0.10613 | -0.388** | -0.465** | 0.143 | 0.219 | 0.067 | 0.560** | |||||||
Hf | 0.081 | 0.206 | 0.158 | 0.258* | -0.0648 | -0.15021 | 0.447** | -0.16507 | -0.274* | 0.495** | 0.884** | ||||||
Ce | 0.254* | 0.125 | 0.023 | 0.363** | 0.117 | -0.016 | 0.481** | -0.21747 | -0.236* | 0.554** | 0.185 | 0.293* | |||||
Nb | 0.907** | 0.768** | 0.940** | 0.738** | 0.949** | 0.809** | 0.690** | -0.862** | -0.806** | -0.462** | -0.264* | 0.042 | -0.06211 | ||||
Sc | -0.14804 | -0.450** | -0.16594 | -0.19791 | -0.08929 | -0.07828 | -0.257* | 0.253* | 0.371** | 0.040 | -0.336** | -0.468** | 0.059 | -0.16283 | |||
V | 0.084 | -0.243* | 0.012 | 0.040 | 0.072 | 0.002 | 0.079 | 0.026 | 0.136 | 0.170 | -0.11625 | -0.1431 | 0.463** | -0.00411 | 0.627** | ||
U | -0.285 | -0.573** | -0.252* | -0.385** | -0.19924 | -0.349** | -0.255* | 0.410** | 0.487** | 0.160 | -0.19129 | -0.468** | 0.166 | -0.307** | 0.569** | 0.500** | |
Cu | -0.21993 | -0.416** | -0.294* | -0.279* | -0.17426 | -0.11907 | -0.390** | 0.328** | 0.449** | 0.020 | -0.418** | -0.481** | 0.070 | -0.269* | 0.573** | 0.506** | 0.488** |
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