气候变化领域集成服务门户(CCPortal): Controlling the Iron Migration Mechanism for the Cretaceous Sediment Color Variations in Sichuan Basin, China

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DOI	10.1021/acsomega.1c04893
	Controlling the Iron Migration Mechanism for the Cretaceous Sediment Color Variations in Sichuan Basin, China
	Jiang, Haoyuan; Xia, Yanqing; Li, Jiyong; Liu, Shanpin; Zhang, Mingzhen; Wang, Yongchao
通讯作者	Jiang, HY ; Xia, YQ (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China. ; Jiang, HY (通讯作者)，Univ Chinese Acad Sci, Beijing 100049, Peoples R China. ; Jiang, HY ; Xia, YQ (通讯作者)，Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China.
发表日期	2022
ISSN	2470-1343
起始页码	480
结束页码	495
卷号	7 期号:1
英文摘要	Cretaceous continental sediments in Sichuan Basin, China, have different colors, and the reasons for their formation are not determined. Based on mineralogical and geochemical characteristics, red beds and nonred beds in the Upper and Lower Cretaceous sedimentary strata in the western Sichuan Basin are described and tested in this study. The test and analysis of the mineral composition, element content, and iron speciation of mudstone samples with gray-green, gray, and red colors in Cangxi, Bailong, and Guankou formations found that the change in hematite content directly causes the color difference of samples. For red mudstone, the average chemical index of alteration, chemical index of weathering, weather eluviation index (Ba), Ca/(Mg*Al), and Al2O3/SiO2 index are 67.75, 79.94, 2.07, 0.26, and 0.26, respectively, indicating that chemical weathering is the most intense. The geochemical indexes corresponding to gray samples are 64.41, 74.91, 2.08, 0.19, and 0.24, respectively. Those corresponding to the gray-green samples are 62.30, 70.68, 2.17, 0.21, and 0.24, with the weakest chemical weathering. The ratio of Cu/Zn and the enrichment factor of V show that red and nonred bed samples are formed in weak oxidation and weak reduction environments, respectively. The red sample contains the highest content of hematite iron. The gray-green sample mainly represents paramagnetic ferrous in clay minerals. The geochemical contents of the gray sample's three iron elements are slightly different, mainly trivalent iron. The change in iron speciation content in different color samples shows that the Fe element forming hematite in red bed samples may come from the weathering of source rock and clay minerals subjected to secondary weathering. At present, it is confirmed that different colors of samples are related to different weathering degrees of source rocks, which can be related to hot, dry/humid climates. It is necessary to distinguish the climate type in combination with other indicators.
关键词	RED BEDS MOSSBAUER-SPECTROSCOPY PALEOCLIMATIC CONDITIONS CLAY-MINERALS CARBON-CYCLE ERHAI LAKE ORIGIN TRANSFORMATION CLIMATE GEOCHEMISTRY
语种	英语
WOS研究方向	Chemistry
WOS类目	Chemistry, Multidisciplinary
WOS记录号	WOS:000734489600001
来源期刊	ACS OMEGA
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/253791
作者单位	[Jiang, Haoyuan; Xia, Yanqing; Li, Jiyong; Liu, Shanpin; Zhang, Mingzhen; Wang, Yongchao] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; [Jiang, Haoyuan; Li, Jiyong; Wang, Yongchao] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Jiang, Haoyuan; Xia, Yanqing; Liu, Shanpin; Zhang, Mingzhen] Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China; [Liu, Shanpin] Lanzhou Univ, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Haoyuan,Xia, Yanqing,Li, Jiyong,et al. Controlling the Iron Migration Mechanism for the Cretaceous Sediment Color Variations in Sichuan Basin, China[J]. 中国科学院西北生态环境资源研究院,2022,7(1).
APA	Jiang, Haoyuan,Xia, Yanqing,Li, Jiyong,Liu, Shanpin,Zhang, Mingzhen,&Wang, Yongchao.(2022).Controlling the Iron Migration Mechanism for the Cretaceous Sediment Color Variations in Sichuan Basin, China.ACS OMEGA,7(1).
MLA	Jiang, Haoyuan,et al."Controlling the Iron Migration Mechanism for the Cretaceous Sediment Color Variations in Sichuan Basin, China".ACS OMEGA 7.1(2022).