DOI: 10.1306/09080909083
Scopus记录号: 2-s2.0-77951755338
论文题名: Massive dolomitization of a pinnacle reef in the lower devonian west point formation (Gaspé Peninsula, Quebec): An extreme case of hydrothermal dolomitization through fault-focused circulation of magmatic fluids
作者: Lavoie D. ; Chi G. ; Urbatsch M. ; Davis W.J.
刊名: AAPG Bulletin
ISSN: 0149-1938
EISSN: 1558-9668
出版年: 2010
发表日期: 2010
卷: 94, 期: 4 起始页码: 513
结束页码: 531
语种: 英语
Scopus关键词: Calcite-cement
; Devonians
; Dolomite crystals
; Dolomitization
; Extreme case
; Fluid inclusion
; Foreland basin
; High temperature
; Homogenization temperatures
; Hydrocarbon migration
; Hydrothermal dolomitization
; Magmatic fluids
; Small crystals
; Standard mean ocean waters
; West points
; Calcite
; Carbonate minerals
; Cements
; Crystals
; Digital devices
; Fracture
; Hydrocarbons
; Mineralogy
; Oceanography
; Petrography
; Reefs
; Sodium chloride
; Fluids
; Acadian
; calcite
; Devonian
; dolomitization
; fault plane
; fluid inclusion
; foreland basin
; hydrothermal alteration
; magmatism
; petrography
; pinnacle reef
; Canada
; Gaspe Peninsula
; Quebec [Canada]
; Belemnoidea
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: Devonian pinnacle reefs of the West Point Formation in Gaspé Peninsula (eastern Canada) were built on paleotectonic highs in a foreland basin. Of the nine pinnacles known in outcrop, one is dolomitized and occurs at the junction of two Acadian faults. The petrography of the dolomitized facies has revealed the presence of three dolomite phases and one late calcite cement. A first dolomite phase of small crystals is volumetrically minor; the following dolomite phase dominates and consists of centimeter-size replacive saddle dolomite crystals that contain fluid inclusions with homogenization temperatures ranging between 301 and 382°C. The third dolomite consists of millimeter- to centimeter-size saddle dolomite crystals that fill late fractures; this phase is characterized by lower temperature fluid inclusions (159-171°C). A lower temperature calcite phase (107-123°C) fills some voids. Fluid inclusions are saline (8.7 to 13.3 wt.% NaClequiv). The dolomite and calcite phases are characterized by very negative δ18OVPDB (Vienna Peedee belemnite) values (between -19 and -14‰) and negative δ13CVPDB values (between -8 and -1‰). The replacive saddle dolomite phase originated from a fluid with very positive δ18OVSMOW (Vienna standard mean ocean water) values (+8‰), whereas the following dolomite and calcite precipitated from fluids with lower δ18OVSMOW values (+3.4 and +4.5‰). We propose that faultfocused circulation of magmatic fluids is responsible for the very high-temperature massive dolomite replacement of the calcite host, and high-temperature burial fluids later used fractures to circulate in the dolomitized host to precipitate late dolomite and calcite. Regionally, hydrocarbon migration is recognized at the time of late calcite cementation. Copyright © 2010. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-77951755338&doi=10.1306%2f09080909083&partnerID=40&md5=223e1f038bfcf932dc828de5e09bd6d5
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13507
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:
Lavoie D.,Chi G.,Urbatsch M.,et al. Massive dolomitization of a pinnacle reef in the lower devonian west point formation (Gaspé Peninsula, Quebec): An extreme case of hydrothermal dolomitization through fault-focused circulation of magmatic fluids[J]. AAPG Bulletin,2010-01-01,94(4)