• 责任者：Miao Weiliang (Key Laboratory of Salt Lake Resources and Chemistry ; Qinghai Institute of Salt Lakes ; Chinese Academy of Sciences ; Xining 810008 ; China) ; Ma Haizhou
• 刊名：Acta Geoscientica Sinica
• 出版年：2013
• 卷期：34(5)
• 关键词：钾盐矿床 ; potash deposit ; 云南 ; Yunnan Province
• 页码：p.537-546
• 图表：6 illus., 1 table, 30 refs.
• 分类号：1002
• issnNo：ISSN1006-3021
• isbnNo：CN11-3474/P

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     man">This paper made a detailed study of clay minerals in salt-bearing strata from drill hole SHK4 located in the Jiangcheng potassium salt basin in the south of Yunnan Province. The authors attempted to reveal the distribution of clay mineral assemblage and its influencing factors, and the significance of these factors for salt man’; mso-hansi-font-family: ’times new roman’">（man">potashman’; mso-hansi-font-family: ’times new roman’">）man"> formation. According to the lithology and deposition process, the sequence can be subdivided into three clay mineral units that reflect the transition from dilute phase to salt-forming period and dilute phase. Unit I is characterized mainly by illite man’; mso-hansi-font-family: ’times new roman’">（man">70.6%man’; mso-hansi-font-family: ’times new roman’">）man"> and kaolinite man’; mso-hansi-font-family: ’times new roman’">（man">26.7%man’; mso-hansi-font-family: ’times new roman’">）man"> with minor amounts of chlorite man’; mso-hansi-font-family: ’times new roman’">（man">2.7%man’; mso-hansi-font-family: ’times new roman’">）man">, indicating strong chemical weathering under the condition of hot and rainy climate. The sediments of Units II in the hypersaline environment with mainly illite man’; mso-hansi-font-family: ’times new roman’">（man">53.6%man’; mso-hansi-font-family: ’times new roman’">）man"> and chlorite man’; mso-hansi-font-family: ’times new roman’">（man">46.4%man’; mso-hansi-font-family: ’times new roman’">）man"> represent a hot arid climate. The main source area also decreased sharply in this period, and this situation to some extent changed the type of clay minerals. Minor amounts of kaolinite man’; mso-hansi-font-family: ’times new roman’">（man">10.7%man’; mso-hansi-font-family: ’times new roman’">）man"> and large amounts of illite man’; mso-hansi-font-family: ’times new roman’">（man">44.5%man’; mso-hansi-font-family: ’times new roman’">）man"> as well as chlorite man’; mso-hansi-font-family: ’times new roman’">（man">41.8%man’; mso-hansi-font-family: ’times new roman’">）man">appear in Units man’; mso-hansi-font-family: ’times new roman’">Ⅲman">, suggesting the intensification of chemical weathering. In addition, good correspondence between the day mineral assemblage and the brine evolution of SHK4 indicates that the hypersaline environment man’; mso-hansi-font-family: ’times new roman’">（man">rich in K, Mgman’; mso-hansi-font-family: ’times new roman’">）man"> had certain restriction on the formation and transformation of clay minerals. Besides, based on the geological structure background of the salt forming period and the characteristics of illite crystallinity man’; mso-hansi-font-family: ’times new roman’">（man">an average of 0.35man’; mso-hansi-font-family: ’times new roman’">°△man">2man’; mso-hansi-font-family: ’times new roman’">θ）man"> and chemical index man’; mso-hansi-font-family: ’times new roman’">（〉man">0.5man’; mso-hansi-font-family: ’times new roman’">）man">, the authors hold that the burial diagenesis also had some effect on clay formation.