摘要
基本层序在垂向上的重大转化面即为基本层序界面,由高到低可划分为旋回性基本层序/不显旋回性基本层序间界面(Ⅰ级界面)、旋回性基本层序/韵律性基本层序间界面(Ⅱ级界面)和向上变细粒序/向上变粗粒序间界面(Ⅲ级界面)。这些界面广泛发育于碎屑沉积岩中,因而是细分地质填图单位的重要选择界面。这一方案是对传统沉积序列分层及地质填图单位界面选择的重要补充,对指导中国造山带巨厚碎屑岩建造的地质填图单位划分、沉积相分析和区域地质研究具有重要意义。
The essential sequence boundary is a major transformation in the vertical plane. It can be divided in downward successioninto three groups, i.e., cycle/non-cycle essential sequence boundary (level Ⅰ interface), cycle/rhythmic essential sequence boundary(level Ⅱ interface) and fining-upward graded/coarsening-upward graded essential sequence (level Ⅲ interface). These interfaces arewidely developed in clastic sedimentary rocks, and hence are important boundaries for subdividing geological mapping unit in detail.This unit is an important complement for traditional layering of sedimentary sequence and interface choosing for geological mappingunit. More importantly, it is a guide to the division of geological mapping unit, the analysis of sedimentary facies and the study of re?gional geology for particularly thick clastic units in the orogenic belt.
作者
李永军
牛海平
杨高学
王冉
佟丽莉
LI Yongjun;NIU Haiping;YANG Gaoxue;WANG Ran;TONG Lili(Earth Science & Resources College, Chang'an University, Key Laboratory of Western China's Mineral Resources and Geological Engineering,Ministry of Education,Xi'an 710054,Shaanxi, China;No. 1 Institute of Geological Exploration, Gansu Provincial Bureau of Mineral Exploration and Development,Tianshui 741020, Gansu, China)
出处
《地质通报》
CAS
CSCD
北大核心
2016年第8期1304-1313,共10页
Geological Bulletin of China
基金
国家自然科学基金项目(批准号:41273033
40534020)
中国地质调查局项目(编号:基[2010]矿评01-01-05
基[2012]02-020-015)
