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古地理学报 ›› 2025, Vol. 27 ›› Issue (1): 85-108. doi: 10.7605/gdlxb.2025.02.009

所属专题： 沉积岩石学进展；

• 白云岩专题 • 上一篇    下一篇

前寒武系海相白云石胶结物研究现状及展望*

甯濛1,2,3,4, 罗靖茹1,2, 陈家乐1,2, 钟怡江1,2,3,4, 文华国1,2,3,4   

  1. 1 成都理工大学沉积地质研究院,四川成都 610059;
    2 成都理工大学油气藏地质及开发工程国家重点实验室,四川成都 610059;
    3 自然资源部深时地理环境重建与应用重点实验室,四川成都 610059;
    4 中国石油碳酸盐岩储层重点实验室成都理工大学研究分室,四川成都 610059
  • 收稿日期:2024-06-11 修回日期:2024-09-09 出版日期:2025-02-01 发布日期:2025-01-20
  • 通讯作者: 文华国,男,1979年生,教授,博士生导师,主要研究方向为碳酸盐岩沉积学; E-mail: wenhuaguo08@cdut.edu.cn。
  • 作者简介:甯濛,女,1991年生,研究员,博士生导师,主要研究方向为碳酸盐岩沉积地球化学; E-mail: ningmeng@cdut.edu.cn。

Precambrian marine dolomite cements: review and perspectives

NING Meng1,2,3,4, LUO Jingru1,2, CHEN Jiale1,2, ZHONG Yijiang1,2,3,4, WEN Huaguo1,2,3,4   

  1. 1 Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China;
    2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;
    3 Key Laboratory of Deep Time Geographical Environment Reconstruction and Application, Ministry of Natural Resources,Chengdu 610059,China;
    4 Branch of Key Laboratory of Carbonate Reservoirs of CNPC,Chengdu University of Technology,Chengdu 610059,China
  • Received:2024-06-11 Revised:2024-09-09 Online:2025-02-01 Published:2025-01-20
  • Contact: WEN Huaguo,born in 1979,a professor,Ph.D. superviser,is engaged in reseach on carbonate sedimentology. E-mail: wenhuaguo08@cdut.edu.cn.
  • About author:NING Meng,born in 1991, researcher,Ph.D. superviser,is engaged in reseach on carbonate geochemistry. E-mail: ningmeng@cdut.edu.cn.

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摘要：

海相白云石胶结物在前寒武纪广泛发育,因其多样的形态、复杂的成因及其对前寒武纪海水性质的指示意义,近年来引起了广泛关注。目前对前寒武系海相白云石胶结物的研究主要集中在两个方面,一是基于矿物学特征分析进行成因探讨,二是探索其反映的前寒武纪海水性质。前人对海相白云石胶结物成因的认识包括原生沉淀与次生交代2种观点,但因缺乏可靠的地球化学证据支撑而存在争议,主要体现在对原生沉淀成因白云石胶结物的具体沉淀机理及其相应的海水化学条件仍不清楚,对次生交代成因白云石胶结物的前驱矿物类型也存在较大分歧。为进一步推动海相白云石胶结物的研究,文中首先系统总结了前寒武系海相白云石胶结物的时空分布特征、岩石学、矿物学及地球化学特征,并从原生沉淀、次生交代、生长组合形态3个方面全面回顾和评述了关于海相白云石胶结物成因研究的现状。在此基础上,对未来相关研究提出以下几点展望: (1)基于矿物成核与生长原理,结合微区或原位地球化学分析,开展不同类型海相白云石胶结物成因研究; (2)评估微生物在海相白云石胶结物形成过程中的具体作用; (3)以前寒武系白云石胶结物为载体探索前寒武纪古海洋海水性质的演化,需建立在厘清其成因的基础之上。

关键词: 前寒武系, 海相白云石胶结物, 拟晶白云石化作用, 原生沉淀白云石, 文石-白云石海

Abstract:

Marine dolomite cement is widely developed in the Precambrian era,whereas its occurrence in the Phanerozoic is scarce. Precambrian marine dolomite cement has attracted extensive attention in recent years due to its diversity,complex origins,and potential implications for Precambrian seawater chemistry. Research on Precambrian marine dolomite cement mainly focuses on two aspects: one is the formation mechanism through mineralogical analysis,and the other is the investigation into the unique Precambrian‘aragonite-dolomite sea' conditions as reflected by marine dolomite cement. The origin of marine dolomite cement incorporates both primary precipitation and mimetic dolomitization. However,due to a lack of reliable geochemical evidence,there is ongoing controversy in this field. In addition,both the precipitation mechanism of the primary dolomite and the corresponding seawater chemical conditions remain unclear. The identification of precursor minerals for mimetic dolomite is controversial. Based on previous studies,it can be summarized the spatial and temporal distribution,petrological and mineralogical characteristics,and geochemical characteristics. Subsequently,the current research status on the formation mechanism of marine dolomite cements from three aspects,including primary precipitation,secondary replacement,and growth assemblage morphology. Finally,it can be proposed that three aspects should be enhanced: (1)The genesis of diverse types of marine dolomite cements should be investigated based on the principles of mineral nucleation and growth theory,combining with micro area or in-situ geochemical analysis;(2)he specific contribution of microorganisms to the formation of marine dolomite cements requires assessment;(3)To gain a comprehensive understanding of the evolution of Precambrian seawater properties,exploration of the origin of marine dolomite cement is imperative.

Key words: Precambrian, marine dolomite cements, mimetic dolomitization, primary dolomite, aragonite-dolomite sea

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