Mineralogical and Geochemical Discrimination of the Occurrence and Genesis of Palygorskite in Eocene Sediments on the Northeastern Tibetan Plateau | |
Song, BW (Song, Bowen)5; Ye, CC (Ye, Chengcheng)1,2; Hong, HL (Hong, Hanlie)4; Fang, XM (Fang, Xiaomin)1,3; Yang, YB (Yang, Yibo)1,3; Zhang, WL (Zhang, Weilin)1,3; Yang, RS (Yang, Rongsheng)1,2; Zhang, ZG (Zhang, Zhiguo)1,2 | |
刊名 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
![]() |
2018-03-01 | |
卷号 | 19期号:3页码:567-581 |
关键词 | Earth-element Enrichments Western Qaidam Basin Tectonic Evolution Cenozoic Climate Asian Monsoon Pedogenic Palygorskite Paleogene Sediments Northwest China Clay-minerals United-states |
ISSN号 | 1525-2027 |
DOI | 10.1002/2017GC007060 |
英文摘要 | Palygorskite is a widely used indicator of semiarid to arid environments in paleoclimate studies. In this study, we present detailed mineralogical and geochemical investigations exploring the genesis of palygorskite found in Eocene fluvial sediment in the northern Qaidam Basin on the northeastern Tibetan Plateau. The presence of two types of palygorskite is revealed, based on their crystallinity characteristics and distinctive rare earth element (REE) patterns in the coexisting clay fraction. Well-crystallized palygorskite samples are characterized by remarkably negative Ce anomalies and obvious middle rare earth element enrichment. Poorly crystallized palygorskite samples generally exhibit positive Ce anomalies and less pronounced middle rare earth element enrichment, which resemble those of nonpalygorskite-bearing clay samples. Given the presence of an overall oxidized fluvial sedimentary environment, we attribute the well-crystallized palygorskite (which has textures comprising long, interwoven fibers) to direct precipitation (i.e., neoformation) occurring within a reducing environment during early/postdepositional processes while the poorly crystallized palygorskite (which is characterized by short, club-shaped single crystals) originates as catchment-delivered detritus. These poorly crystallized palygorskites occur mostly in 49.5-47.0 Ma and are accompanied by decreasing kaolinite content, increasing chlorite content, and abundant xerophytic spore-pollen from the Qaidam Basin, and its neighboring Xining Basin. Collectively, these evidences suggest that a less humid climate followed after the Early Eocene Climate Optimum. |
学科主题 | 地质学 |
WOS研究方向 | Geochemistry & Geophysics |
语种 | 英语 |
出版者 | AMER GEOPHYSICAL UNION |
WOS记录号 | WOS:000433289500001 |
内容类型 | 期刊论文 |
源URL | [http://ir.itpcas.ac.cn/handle/131C11/8705] ![]() |
专题 | 青藏高原研究所_图书馆 |
通讯作者 | Fang, XM (Fang, Xiaomin) |
作者单位 | 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China; 2.Univ Chinese Acad Sci, Beijing, Peoples R China; 3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China; 4.China Univ Geosci, Fac Earth Sci, Wuhan, Hubei, Peoples R China; 5.China Univ Geosci, Inst Geol Survey, Wuhan, Hubei, Peoples R China. |
推荐引用方式 GB/T 7714 | Song, BW ,Ye, CC ,Hong, HL ,et al. Mineralogical and Geochemical Discrimination of the Occurrence and Genesis of Palygorskite in Eocene Sediments on the Northeastern Tibetan Plateau[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2018,19(3):567-581. |
APA | Song, BW .,Ye, CC .,Hong, HL .,Fang, XM .,Yang, YB .,...&Zhang, ZG .(2018).Mineralogical and Geochemical Discrimination of the Occurrence and Genesis of Palygorskite in Eocene Sediments on the Northeastern Tibetan Plateau.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,19(3),567-581. |
MLA | Song, BW ,et al."Mineralogical and Geochemical Discrimination of the Occurrence and Genesis of Palygorskite in Eocene Sediments on the Northeastern Tibetan Plateau".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 19.3(2018):567-581. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论