Sedimentary microfacies and evolution of Cenozoic Liupanshan Basin

LI Keyong; SU Xiaolinda; XU Shuaikang; YANG Wenpeng; LI Wenhou

doi:10.16152/j.cnki.xdxbzr.2024-06-015

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Sedimentary microfacies and evolution of Cenozoic Liupanshan Basin

Lithofacies palaeogeography and sedimentary evolution of Ordos Basin | 更新时间：2024-12-16

- Sedimentary microfacies and evolution of Cenozoic Liupanshan Basin
- Journal of Northwest University (Natural Science Edition) Vol. 54, Issue 6, Pages: 1121-1130(2024)
- 作者机构：
  
  1.西安科技大学　地质与环境学院/期刊中心，陕西　西安　 710054
  2.西北大学　地质学系/大陆动力学国家重点实验室，陕西　西安　 710069
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2024-06-015
  CLC： TE111.3
- Published：25 December 2024，
  
  Received：26 July 2024，
- 稿件说明：
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LI KEYONG, SU XIAOLINDA, XU SHUAIKANG, et al. Sedimentary microfacies and evolution of Cenozoic Liupanshan Basin. [J]. Journal of northwest university (natural science edition), 2024, 54(6): 1121-1130.
DOI：

LI KEYONG, SU XIAOLINDA, XU SHUAIKANG, et al. Sedimentary microfacies and evolution of Cenozoic Liupanshan Basin. [J]. Journal of northwest university (natural science edition), 2024, 54(6): 1121-1130. DOI： 10.16152/j.cnki.xdxbzr.2024-06-015.

摘要

为研究六盘山盆地新生界沉积微相特征与沉积演化规律，以盆地周缘野外露头岩性、沉积构造与沉积微相特征为研究对象，对六盘山盆地新生界沉积微相与沉积演化进行研究。结果表明，六盘山盆地新生界发育始新统寺口子组、渐新统清水营组、中新统彰恩堡组与干河沟组，与下伏不同时代地层不整合接触；六盘山盆地新生界沉积相为冲积扇、辫状河、三角洲、湖泊及沙漠沉积；根据砂、泥沉积在纵向上的组合特征，识别出砂泥薄互层式、厚泥厚砂式、薄泥厚砂式、厚泥薄砂式4种沉积充填样式；受青藏高原隆升的影响，六盘山盆地填充初始期寺口子组以辫状河冲积扇为主，在横向和纵向上变化较大，高峰期清水营组蒸发强烈，以膏盐等碎屑岩为特色的湖相沉积为主，衰退期彰恩堡组南部以湖相为主，北部以河流相为主，消亡期干河沟组自下而上砾石增多，以河流相为主，整个新生界沉积微相反映了六盘山盆地新生代沉积演化过程。研究结果对六盘山盆地新生界沉积微相与沉积演化规律有了新认识，也为不同层位、不同沉积盆地的研究提供借鉴。

Abstract

In order to study the characteristics of Cenozoic sedimentary microfacies and sedimentary evolution of Liupanshan Basin

the Cenozoic sedimentary microfacies and sedimentary evolution of Liupanshan Basin are studied based on the lithology

sedimentary structure and sedimentary microfacies characteristics of outcrops around the basin. The results show that the Cenozoic in Liupanshan Basin developed the Sikouzi Formation of Eocene

the Qingshuiying Formation of Oligocene

the Zhangenbao Formation of Miocene and the Ganhegou Formation

which were in unconformity with the underlying strata of different ages. The Cenozoic sedimentary facies in Liupanshan Basin are alluvial fan

braided river

delta

lake and desert deposits. According to the combination characteristics of sand and mud deposition in the longitudinal direction

four kinds of sedimentary filling styles are identified: sand and mud thin interlayer type

thick mud and sand thick type

thin mud and sand thick type. Influenced by the uplift of the Tibetan Plateau

the Sikouzi Formation was dominated by braided river-alluvial fans during the initial filling period of the Liupanshan Basin

which varied greatly in both transverse and longitudinal aspects. During the peak period

the Qingshuiying Formation was dominated by lacustrine sediments characterized by clastic rocks such as salt and salt. During the decline period

the Zhangenbao Formation was dominated by lacustrine facies in the south and fluvial facies in the north. The whole Cenozoic sedimentary microfacies reflects the Cenozoic sedimentary evolution of Liupanshan Basin

mainly fluvial facies. The results of this study provide a new understanding of the sedimentary microfacies and sedimentary evolution of the Cenozoic in Liupanshan Basin

and provide reference for the study of different strata and sedimentary basins.

关键词

沉积微相沉积演化新生界六盘山盆地

Keywords

sedimentary microfaciessedimentary evolutionCenozoicLiupanshan Basin

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