Characteristics and Implications of the Oolitic Limestones from the Silurian Succession in Wangcang, hemas-microsoft-com:office:smarttags" />Sichuan Province , South China
详细信息
- 责任者：Qin Song (School of Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Zhang Tao
- 刊名：Earth Science
- 出版年：2011
- 卷期：36(1)
- 关键词：鲕状灰岩 ; oolitic limestone ; 四川 ; Sichuan Province
- 页码：p.43-52
- 图表：4 illus., 1 table, 45 refs.
- 分类号：0803
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
摘要
hDivSummary name="EnDivSummary">Oolitic limestone has been recognized for the first time in the Early Silurian (Telychian) Nanjiang Formation from Wangcang, northwestern Sichuan Province. Facies analyses show that this oolitic-bearing succession developed in a ramp environment. With the thickness less than 10 cm in general and interbedded in the ramp succession, it can be determined that the oolitic layers were moved by episodic currents probably from a large oolitic beach near Wangcang, northwestern Sichuan Province, Upper Yangtze Platform. Under the microscope, the categories of the oolites are monotonous, and somewhat compressed and deformed, with close contacts and serrated appearances. It also indicates that the oolites should be well-sorted and transported under the high-energy environment, and then be compacted during the following diagenetic stage. The oxygen and carbon isotope analyses of the oolites indicate that the paleotemperature is 25~31 ℃, suggesting tropical to subtropical climates of the mediate to low latitude during the Early Silurian (Telychian) in the Upper Yangtze region.