Petrologic and geochemical evolution of carbonates of South Bruce region, Southwest Ontario: Dolomite petrogenesis and fluid flow evolution

IF 3.7 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Marine and Petroleum Geology Pub Date : 2025-03-11 DOI:10.1016/j.marpetgeo.2025.107377
Ihsan S. Al-Aasm , Richard Crowe , Marco Tortola
{"title":"Petrologic and geochemical evolution of carbonates of South Bruce region, Southwest Ontario: Dolomite petrogenesis and fluid flow evolution","authors":"Ihsan S. Al-Aasm ,&nbsp;Richard Crowe ,&nbsp;Marco Tortola","doi":"10.1016/j.marpetgeo.2025.107377","DOIUrl":null,"url":null,"abstract":"<div><div>Cored samples from two deep boreholes in the South Bruce Region, Ontario, Canada were analyzed to assess the dolomitization process and other diagenetic features of rocks spanning from the Ordovician to Devonian periods. These samples, including dolomitized limestone, dolostones, and evaporites, were compared with previous results from the Bruce Nuclear site and adjacent areas. The analyses focused on mineralogy, stable isotope composition, geochemistry, fluid inclusions microthermometry, and Sr-isotopic ratios, offering insights into source fluids and the timing of dolomitization. Dolomitization in the region is characterized by two main generations: non-stoichiometric replacive dolomite and saddle dolomite cement. The replacive dolomite includes microcrystalline matrix dolomite (D1) that replaces wackestone, packstone, and occasionally grainstone facies. A later formed medium to coarse crystalline dolomite (D2) replaces grainstone facies and is associated with dissolution seams, stylolites, and recrystallized dolomite. Both dolomites formed from warm, saline basinal fluids. Saddle dolomite (SD) is found in minor vugs and fractures in Ordovician and Silurian strata, postdating D1 and D2. Isotopic and microthermometric data indicate multiple diagenetic fluid events with the formation of D1 at shallow burial depth followed by the formation of D2 and SD at an intermediate burial depth likely occurred during Taconian and Acadian orogenies. The negative δ<sup>18</sup>O values, enriched <sup>87</sup>Sr/<sup>86</sup>Sr ratios, and high homogenization temperatures for D2, and SD dolomites suggest formation from connate fluids influenced by basinal brines and hydrothermal fluids. In contrast, Devonian dolomite and blocky calcite exhibit lower salinity and higher homogenization temperatures, reflecting fluid evolution linked to the Alleghenian Orogeny. Geochemical similarities between the Bruce Nuclear site and South Bruce region highlight their geographic proximity, with variations due to different depositional settings, diagenetic fluid compositions and the presence of hydrothermal fluids.</div><div>The integration of the petrographic, isotopic and geochemical data in this study reveals the connection between fluid flux history and diagenetic processes, highlighting their role in the regional tectonic evolution of the Michigan Basin.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"177 ","pages":"Article 107377"},"PeriodicalIF":3.7000,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Marine and Petroleum Geology","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0264817225000947","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0

Abstract

Cored samples from two deep boreholes in the South Bruce Region, Ontario, Canada were analyzed to assess the dolomitization process and other diagenetic features of rocks spanning from the Ordovician to Devonian periods. These samples, including dolomitized limestone, dolostones, and evaporites, were compared with previous results from the Bruce Nuclear site and adjacent areas. The analyses focused on mineralogy, stable isotope composition, geochemistry, fluid inclusions microthermometry, and Sr-isotopic ratios, offering insights into source fluids and the timing of dolomitization. Dolomitization in the region is characterized by two main generations: non-stoichiometric replacive dolomite and saddle dolomite cement. The replacive dolomite includes microcrystalline matrix dolomite (D1) that replaces wackestone, packstone, and occasionally grainstone facies. A later formed medium to coarse crystalline dolomite (D2) replaces grainstone facies and is associated with dissolution seams, stylolites, and recrystallized dolomite. Both dolomites formed from warm, saline basinal fluids. Saddle dolomite (SD) is found in minor vugs and fractures in Ordovician and Silurian strata, postdating D1 and D2. Isotopic and microthermometric data indicate multiple diagenetic fluid events with the formation of D1 at shallow burial depth followed by the formation of D2 and SD at an intermediate burial depth likely occurred during Taconian and Acadian orogenies. The negative δ18O values, enriched 87Sr/86Sr ratios, and high homogenization temperatures for D2, and SD dolomites suggest formation from connate fluids influenced by basinal brines and hydrothermal fluids. In contrast, Devonian dolomite and blocky calcite exhibit lower salinity and higher homogenization temperatures, reflecting fluid evolution linked to the Alleghenian Orogeny. Geochemical similarities between the Bruce Nuclear site and South Bruce region highlight their geographic proximity, with variations due to different depositional settings, diagenetic fluid compositions and the presence of hydrothermal fluids.
The integration of the petrographic, isotopic and geochemical data in this study reveals the connection between fluid flux history and diagenetic processes, highlighting their role in the regional tectonic evolution of the Michigan Basin.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
求助全文
约1分钟内获得全文 去求助
来源期刊
Marine and Petroleum Geology
Marine and Petroleum Geology 地学-地球科学综合
CiteScore
8.80
自引率
14.30%
发文量
475
审稿时长
63 days
期刊介绍: Marine and Petroleum Geology is the pre-eminent international forum for the exchange of multidisciplinary concepts, interpretations and techniques for all concerned with marine and petroleum geology in industry, government and academia. Rapid bimonthly publication allows early communications of papers or short communications to the geoscience community. Marine and Petroleum Geology is essential reading for geologists, geophysicists and explorationists in industry, government and academia working in the following areas: marine geology; basin analysis and evaluation; organic geochemistry; reserve/resource estimation; seismic stratigraphy; thermal models of basic evolution; sedimentary geology; continental margins; geophysical interpretation; structural geology/tectonics; formation evaluation techniques; well logging.
期刊最新文献
Editorial Board Delving into the Jurassic sediments of the Matruh basin, Northwestern Desert, Egypt: A multidisciplinary approach using seismic data, stratigraphic analysis, and 3D facies modeling Hydraulic and thermal controls on gas production from methane hydrate reservoirs Petrologic and geochemical evolution of carbonates of South Bruce region, Southwest Ontario: Dolomite petrogenesis and fluid flow evolution Analysis of the correlation between fracture topology and mechanical properties of rocks in fractured carbonate reservoirs: In Dehram group, Fars arc Zone (Southwest Iran)
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1