镁同位素组成对辽宁北票地区高于庄组白云岩成因的约束

doi:10.13209/j.0479-8023.2025.041

北京大学学报（自然科学版） ›› 2025, Vol. 61 ›› Issue (4): 697-708.DOI: 10.13209/j.0479-8023.2025.041

镁同位素组成对辽宁北票地区高于庄组白云岩成因的约束

王天宇¹, 凌坤¹, 魏韧^1,2, 董琳^1,†

1. 造山带与地壳演化教育部重点实验室, 北京大学地球与空间科学学院, 北京 100871 2. 北京大学能源研究院, 北京 100871

收稿日期:2024-05-08 修回日期:2024-06-19 出版日期:2025-07-20 发布日期:2025-07-20
通讯作者: 董琳, E-mail: lin.dong(at)pku.edu.cn
基金资助:
国家自然科学基金(41672334)资助

Constraints of Magnesium Isotope Composition on the Origin of Dolomite of Gaoyuzhuang Formation in Beipiao Area, Liaoning Province

WANG Tianyu¹, LING Kun¹, WEI Ren^1,2, DONG Lin^1,†

1. The Key Laboratory of Orogenic Belts and Crustal Evolution (MOE), School of Earth and Space Sciences, Peking University, Beijing 100871 2. Institute of Energy, Peking University, Beijing 100871

Received:2024-05-08 Revised:2024-06-19 Online:2025-07-20 Published:2025-07-20
Contact: DONG Lin, E-mail: lin.dong(at)pku.edu.cn

摘要/Abstract

摘要：

对辽宁北票地区高于庄组白云岩展开岩石学分析和元素地球化学测试, 通过岩石学和层序地层学分析, 在厚度为24 m的地层剖面中识别出11个沉积旋回, 发现白云岩镁同位素组成在纵向上的波动与准层序划分基本上契合, 表明北票地区高于庄组厚层白云岩是不同期次(旋回)白云石化过程持续叠加形成的, 验证了前人关于寒武系厚层白云岩成因的假说。研究结果表明, 不同期次白云石化持续叠加的厚层白云岩成因假说同样适用于前寒武纪的厚层白云岩。

关键词: 镁同位素, 高于庄组, 白云岩成因, 北票地区

Abstract:

Petrographic analysis and elemental geochemical testing were conducted on the dolostones of Gaoyuzhuang Formation in Beipiao area, Liaoning Province. Through petrographic and sequence stratigraphic analyses, eleven sedimentary cycles were identified within a 24-meter-thick stratigraphic section. It was found that the vertical fluctuations in magnesium isotope compositions of the dolostones broadly correspond to the subdivision of parasequences. This indicates that the thick-bedded dolostones of Gaoyuzhuang Formation in Beipiao area were formed by the cumulative superimposition of dolomitization processes occurring during different episodes (cycles). These results validate previous hypotheses regarding the genesis of thick Cambrian dolostone successions. Furthermore, the findings demonstrate that the genetic hypothesis that thick dolostones form via the progressive superimposition of multiple dolomitization events is also applicable to Precambrian dolostones.

Key words: Mg isotopes, Gaoyuzhuang Formation, origin of dolomite, Beipiao area

王天宇, 凌坤, 魏韧, 董琳. 镁同位素组成对辽宁北票地区高于庄组白云岩成因的约束[J]. 北京大学学报（自然科学版）, 2025, 61(4): 697-708.

WANG Tianyu1, LING Kun, WEI Ren, DONG Lin.

Constraints of Magnesium Isotope Composition on the Origin of Dolomite of Gaoyuzhuang Formation in Beipiao Area, Liaoning Province

[J]. Acta Scientiarum Naturalium Universitatis Pekinensis, 2025, 61(4): 697-708.

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链接本文: https://xbna.pku.edu.cn/CN/10.13209/j.0479-8023.2025.041

https://xbna.pku.edu.cn/CN/Y2025/V61/I4/697

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镁同位素组成对辽宁北票地区高于庄组白云岩成因的约束

Constraints of Magnesium Isotope Composition on the Origin of Dolomite of Gaoyuzhuang Formation in Beipiao Area, Liaoning Province

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