休伦岩域(密歇根盆地)次生蒸发岩及相关主岩白云石的成因演化:岩石学、地球化学和C-O-S-Sr同位素的启示

IF 2 4区 地球科学 Q1 GEOLOGY
I. Al-Aasm, Richard Crowe, M. Tortola, M. Özyurt
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引用次数: 0

摘要

本文对安大略省密歇根盆地东翼寒武系—泥盆系沉积序列中次生硫酸盐和伴生寄主岩碳酸盐岩的C-O-S-Sr同位素系统和元素分析进行了详细研究。研究了密歇根盆地低渗透碳酸盐单元中裂缝充填和替代硫酸盐矿物孔隙流体的成岩演化及其来源。次生硫酸盐以石膏和硬石膏为代表,具有多种岩相类型,以寒武系(δ 18o值为16.8 ~ 17.6 permil VPDB, δ 34S值为28.3 ~ 29.0 permil CDT, 87Sr/86Sr比值分别为0.70834 ~ 0.70991)和奥陶系(δ 18o值为16.8 permil, δ 34S值为28.2 permil, 87Sr/86Sr比值为0.70829)的孔洞和裂缝充填纤维硬石膏为代表。这些相主要表现出均匀的稀土元素模式(Y/Ho和Zr/Hf),扁平的La*、Gd*和Y*以及富集的lree。异种斑岩石膏δ 18o值在4.5 ~ 13.3 permil之间,δ 34s23.4 ~ 31.4 permil之间(87Sr/86Sr比值0.70816 ~ 0.70866),δ 34s22.6 ~ 33.1 permil之间(87Sr/86Sr比值0.70850 ~ 0.70880),alabastrine石膏δ 18o值在4.2 ~ 11.7 permil之间,δ 34s23.1 ~ 26.9 permil之间(87Sr/86Sr比值0.70816 ~ 0.70876),毛边硬石膏δ 18o值为11.1 permil。δ 34s27.4 peril, 87Sr/86Sr比值为0.70849)。这些地球化学指标表明,在相似的地球化学条件下,两个年龄组的富硫酸盐源具有可比性。志留系盐碱地群石膏的REE值(Y/Ho、Zr/Hf)、Nd/YbN、Pr/YbN、Ce/Ce*、Eu/Eu* (Gd/LaN、Tb/LaN、Sm/LaN)异常范围广。这些硫酸盐是在埋藏时由同位素、化学成分和温度变化的流体形成的。这些流体的来源包括寒武系和奥陶系盆地深层迁移形成硬石膏的盐水(受白云化和后期热液流入的影响),以及阿勒格尼期及之后浅埋深度石膏的再水化作用(受盐溶解和大气水侵入的影响)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Diagenetic evolution of secondary evaporites and associated host rock dolostones in the Huron Domain (Michigan Basin): insights from petrography, geochemistry, and C-O-S-Sr isotopes
In this study, we present a detailed investigation of C-O-S-Sr isotope systematics and elemental analysis of secondary sulfates and associated host rock carbonates of Cambrian to Devonian sedimentary successions along the eastern flank of the Michigan Basin, Ontario. This study evaluates the diagenetic evolution of pore fluids and their sources in fracture-fill and replacement sulfate minerals within low-permeability carbonate units in the Michigan Basin. Secondary sulfates, represented by gypsum and anhydrite, contain various petrographic types, represented by vug- and fracture-filling fibrous anhydrite in the Cambrian (δ18O vary between 16.8 to 17.6 permil VPDB and δ 34S 28.3 to 29.0 permil CDT, 87Sr/86Sr ratios vary from 0.70834 to 0.70991, respectively) and Ordovician fibrous anhydrite (δ18O 16.8 permil, δ 34S 28.2 permil, 87Sr/86Sr ratios 0.70829). These phases display mainly uniform REE patterns with Y/Ho and Zr/Hf ratios, flat La*, Gd*, and Y* and enriched LREEs. Idiotopic satin-spar δ18O values vary between 4.0 and 8.3 permil, δ 34S 23.4 and 31.4 δ with 87Sr/86Sr ratios 0.70816-0.70866), xenotopic porphyroblast gypsum δ18O value vary between 4.5 and 13.3 permil, δ34S 22.6 to 33.1 permil with 87Sr/86Sr ratios of 0.70850-0.70880, alabastrine gypsum δ18O values vary between 4.2 and 11.7 permil, δ34S 23.1 to 26.9 permil with 87Sr/86Sr ratios of 0.70816-0.70876) and felted anhydrite δ18O values of 11.1 permil, δ 34S 27.4 permil with 87Sr/86Sr ratio of 0.70849). These geochemical proxies suggest a comparable sulfate-rich source for both age groups under similar geochemical conditions. Gypsum in the Silurian Salina Group display a wide range of REE values with Y/Ho, and Zr/Hf ratios, Nd/YbN and Pr/YbN, flat to strong Ce/Ce*, and flat to strong Eu/Eu* anomaly, Gd/LaN and Tb/LaN, Sm/LaN). These sulfates formed at burial from fluids of variable isotopic, chemical composition and temperatures. The sources of these fluids range from brines migrating from a deeper part of the basin forming anhydrite in the Cambrian and Ordovician sequences which were also affected by dolomitization and later hydrothermal fluid influx, to rehydration of gypsum at shallower burial depths and affected by salt dissolution and incursion of meteoric water during and following the Alleghenian orogeny.
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来源期刊
CiteScore
3.80
自引率
5.00%
发文量
50
审稿时长
3 months
期刊介绍: The journal is broad and international in scope and welcomes contributions that further the fundamental understanding of sedimentary processes, the origin of sedimentary deposits, the workings of sedimentary systems, and the records of earth history contained within sedimentary rocks.
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