Crystal structure characteristics and genesis analysis of Ordovician dolomite in North China

XIANG Pengfei; WANG Xinwei; LIU Rui; FENG Shuangqi; YANG Zhibo; JI Hancheng

doi:10.16152/j.cnki.xdxbzr.2025-05-017

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Crystal structure characteristics and genesis analysis of Ordovician dolomite in North China

更新时间：2025-10-31

- Crystal structure characteristics and genesis analysis of Ordovician dolomite in North China
- Journal of Northwest University (Natural Science Edition) Vol. 55, Issue 5, Pages: 1154-1168(2025)
- 作者机构：
  
  1.中石化新星〔北京〕新能源研究院有限公司，北京　100083
  2.深层地热富集机理与高效开发全国重点实验室，北京　100083
  3.中国石油大学〔北京〕地球科学学院，北京　102249
  4.中煤水文局集团有限公司，河北　雄安新区　070001
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2025-05-017
  CLC： P581
- Received：01 December 2024，
  
  Published：25 October 2025
- 稿件说明：
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XIANG Pengfei, WANG Xinwei, LIU Rui, et al. Crystal structure characteristics and genesis analysis of Ordovician dolomite in North China[J]. Journal of northwest university (natural science edition), 2025, 55(5): 1154-1168.
DOI：

XIANG Pengfei, WANG Xinwei, LIU Rui, et al. Crystal structure characteristics and genesis analysis of Ordovician dolomite in North China[J]. Journal of northwest university (natural science edition), 2025, 55(5): 1154-1168. DOI： 10.16152/j.cnki.xdxbzr.2025-05-017.

摘要

基于沉积背景，综合岩石学和XRD分析研究华北地区下、中奥陶统白云岩的类型及特征，探讨其成因，揭示奥陶系白云石化机理。研究表明：①根据白云石的晶体形态及晶粒大小，下奥陶统亮甲山组发育5类白云岩（LD1~LD5），中奥陶统马家沟组发育3类白云岩（MD1~MD3）；②白云石晶体粒径越大，白云石化越强，有序度越高，晶胞参数

值越大，而晶格越无序，白云石结晶速度越快；③LD1和MD1形成于潮上带蒸发泵白云石化，LD2和MD2为回流渗透白云石化成因，LD3~LD5及MD3形成于不同阶段埋藏白云石化；④在沉积阶段，持续的海平面下降控制了亮甲山组白云岩的原始分布，而中奥陶世3个海退阶段是马家沟组白云岩的主要形成期，随后以埋藏白云石化为主。研究结果为深入理解华北奥陶系白云石化过程提供了新视角。

Abstract

Based on the sedimentary background

this study combines petrology and XRD analysis to investigate the types and characteristics of Ordovician dolomite in North China

and discusses their origins

revealing the dolomitization mechanisms of the Ordovician. The results show: ① According to the crystal morphology and grain size of dolomite

five types of dolomite (LD1~LD5) have been identified in the Lower Ordovician Liangjiashan Formation

while three types of dolomite (MD1~MD3) have been recognized in the Middle Ordovician Majiagou Formation; ② The larger the dolomite crystal grain size

the stronger the degree of dolomitization and the higher the structural order. Meanwhile

a larger cell parameter (c/Å) value suggests a more disordered lattice and a faster dolomite crystallization rate; ③ LD1 and MD1 formed through supratidal evaporative pump dolomitization

while LD2 and MD2 resulted from reflux dolomitization. LD3 through LD5

along with MD3

formed during various stages of burial dolomitization; ④ During the sedimentation stage

a continuous sea-level decline influenced the initial distribution of the Liangjiashan Formation dolomite. Additionally

three regression stages in the Middle Ordovician were the primary periods for the formation of the Majiagou Formation dolomite

which was subsequently altered primarily by burial dolomitization. This study provides a new perspective on the dolomitization process of the Ordovician in North China.

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