| DOI: | 10.1306/05121413127
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| Scopus记录号: | 2-s2.0-84908455192
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| 论文题名: | Dimensions, texture-distribution, and geochemical heterogeneities of fracture-related dolomite geobodies hosted in Ediacaran limestones, northern Oman |
| 作者: | Vandeginste V.; John C.M.; Cosgrove J.W.; Manning C.
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| 刊名: | AAPG Bulletin
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| ISSN: | 0149-1579
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| EISSN: | 1558-9309
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| 出版年: | 2014
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| 发表日期: | 2014
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| 卷: | 98, 期:9 | | 起始页码: | 1789
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| 结束页码: | 1809
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| 语种: | 英语
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| Scopus关键词: | Ediacaran
; Geobodies
; Geochemical heterogeneity
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| Scopus学科分类: | Energy
; Earth and Planetary Sciences
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| 英文摘要: | Predicting spatial distribution, dimension, and geometry of diage-netic geobodies, as well as heterogeneities within these bodies, is challenging in subsurface applications, and can impact the results of reservoir modeling. In this outcrop-based study, we generated a data set of the dimensions of fracture-related dolomite geobodies hosted in Ediacaran (Khufai Formation) limestones of the Oman Mountains that are up to several hundreds of meters long and a few tens of meters wide. The dolomite formed under burial conditions by fluids that interacted with siliciclastic layers, as demonstrated by the enriched Fe (up to 4.4%) and Mn (up to 0.8%) contents and 87Sr/86Sr (∼0.710) signatures. Dolomitization probably occurred during the Hercynian Orogeny (or pre-Permian) because dolomitization predates some folding and pre-Permian rocks have seen intense deformation related to the Carboniferous Hercynian Orogeny. Moreover, dolomitization occurred between the onset and termination of bedding-parallel stylolitization and thus most likely before deep burial related to the Alpine Orogeny. Hence, dolomitization most likely occurred before deep burial related to the Alpine Orogeny and during or following the intense deformation related to the Carboniferous Hercynian Orogeny had affected pre-Permian rocks. The clumped-isotope signature yields a temperature of approximately 260°C (500°F), interpreted as the apparent equilibrium temperature obtained during uplift after deepest burial during the Late Cretaceous. Lateral transects across the dolomite bodies show that zebra dolomite textures are common throughout the body and that vugs are more common at the rim than the center of the bodies. Moreover, a weak geochemical trend exists with more depleted 18O, Fe, and Mn concentrations in the core than at the rim of the dolomite bodies. These results show that minor heterogeneities exist within the dolomite bodies investigated. These data contrast with previous studies, in which more significant variation is reported in width of the dolomitization halo and texture for larger dolomite bodies that formed in host rocks more permeable than the examples from the Oman Mountains. Copyright © 2014. The American Association of Petroleum Geologists. All rights reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84908455192&doi=10.1306%2f05121413127&partnerID=40&md5=900843d4b6ff90514d4c4920ee5a68a3
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/13150
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| Recommended Citation: | |
Vandeginste V.,John C.M.,Cosgrove J.W.,et al. Dimensions, texture-distribution, and geochemical heterogeneities of fracture-related dolomite geobodies hosted in Ediacaran limestones, northern Oman[J]. AAPG Bulletin,2014-01-01,98(9)
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