| 滇西云龙地区下白垩统南新组岩相分析及意义 |
| |
| 引用本文： | 孙勇,李祥辉,周勇.滇西云龙地区下白垩统南新组岩相分析及意义[J].华南地质与矿产,2012,28(2):141-148. |
| |
| 作者姓名： | 孙勇 李祥辉 周勇 |
| |
| 作者单位： | 1. 成都理工大学地球科学学院,成都,610059
2. 南京大学地球科学与工程学院,南京,210093 |
| |
| 基金项目： | 国家重大基础研究发展规划项目，课题“中国白垩纪重要时期的古气候重建” |
| |
| 摘 要： | 实测了云南西部兰坪盆地云龙县城南沘江西岸下白垩统南新组剖面。通过野外实测资料以及岩石薄片的观察描述,综合分析了研究区南新组的岩石组合、沉积构造、剖面结构等特征,认为南新组自下而上主要为曲流河相和湖泊相,厚度较薄的土壤相常作为夹层与前两者交互出现。河流相可进一步识别划分出河道、边滩、河漫滩、天然堤等亚相;湖泊相则可分辨滨湖、浅湖、半深湖三种亚相;古土壤相可分为钙质土和潜育土两种类型。相序结构指示研究区在早白垩世南新组沉积期为一个由构造运动相对活跃到较为稳定的过程,岩相组合结合土壤相分析显示气候以亚热带干旱-半干旱为特征。
|
| 关 键 词： | 岩相 古气候 南新组 下白垩统 云南云龙县 |
Lithofacies and Its Significances of Lower Cretaceous Nanxin Formation in Yunlong County,Westen Yunnan Province |
| |
| SUN Yong,LI Xiang-Hui,ZHOU Yong.Lithofacies and Its Significances of Lower Cretaceous Nanxin Formation in Yunlong County,Westen Yunnan Province[J].Geology and Mineral Resources of South China,2012,28(2):141-148. |
| |
| Authors: | SUN Yong LI Xiang-Hui ZHOU Yong |
| |
| Institution: | 1(1.College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China;2.School of Earth Sciences and Engineering,Nanjing University,Nanjing 210093,China) |
| |
| Abstract: | A cross-section of Lower Cretaceous Nanxin Formation was measured at west bank of Bijiang River near Yunlong county,western Lanping basin.Lithofacies and subfacies were analyzed by microfacies under microscope and observation of lithology,sedimentary structure in the field.Three lithofacies can be recognized from the Nanxin Formation：meandering river facies,lacustrine facies interbedded or intercalated with thin paleosol facies.Subsequently,the meandering river facies is subdivided into four subfacies of channel,point bar,levee and overbank;and the lacustrine facies can be subdivided into shore,shallow and semi-deep lake subfacies.The paleosol facies is classified as calcareous soil and gleysol.Lithofacies succession and association of Nanxin Formation indicate a change of relative active to stable in regional tectonics,and sub-tropic hot semi-arid and arid weather during sedimentary of Nanxin Formation in Early Cretaceous. |
| |
| Keywords: | lithofacies paleoclimate Nanxin Formation Lower Cretaceous Yunlong county Yunnan province |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
