气候变化领域集成服务门户(CCPortal): Regional fault-controlled shallow dolomitization of the Middle Cambrian Cathedral Formation by hydrothermal fluids fluxed through a basal clastic aquifer

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DOI	10.1130/B35927.1
	Regional fault-controlled shallow dolomitization of the Middle Cambrian Cathedral Formation by hydrothermal fluids fluxed through a basal clastic aquifer
	Stacey, Jack; Corlett, Hilary; Holland, Greg; Koeshidayatullah, Ardiansyah; Cao, Chunhui; Swart, Peter; Crowley, Stephen; Hollis, Cathy
通讯作者	Stacey, J (通讯作者)，Univ Manchester, Dept Earth & Environm Sci, Manchester M13 9PL, Lancs, England.
发表日期	2021
ISSN	0016-7606
EISSN	1943-2674
起始页码	2355
结束页码	2377
卷号	133 期号:11-12
英文摘要	This study evaluates examples of hydro thermal dolomitization in the Middle Cambrian Cathedral Formation of the Western Canadian Sedimentary Basin. Kilometer scale dolomite bodies within the Cathedral Formation carbonate platform are composed of replacement dolomite (RD), with saddle dolomite-cemented (SDC) breccias occurring along faults. These are overlain by the Stephen Formation (Burgess Shale equivalent) shale. RD is crosscut by low-amplitude stylolites cemented by SDC, indicating that dolomitization occurred at very shallow depths (<1 km) during the Middle Cambrian. Clumped isotope data from RD and SDC indicate that dolomitizing fluid temperatures were >230 degrees C, which demonstrates that dolomitization occurred from hydrothermal fluids. Assuming a geothermal gradient of 40 degrees C/ km, due to rift-related basin extension, fluids likely convected along faults that extended to similar to 6 km depth. The negative cerium anomalies of RD indicate that seawater was involved in the earliest phases of replacement dolomitization. Kr-84/Ar-36 and Xe-132/Ar-36 data are consistent with serpentinite-derived fluids, which became more dominant during later phases of replacement dolomitization/SDC precipitation. The elevated Sr-87/Sr-86 of dolomite phases, and its co-occurrence with authigenic quartz and albite, likely reflects fluid interaction with K-feldspar in the underlying Gog Group before ascending faults to regionally dolomitize the Cathedral Formation. In summary, these results demonstrate the important role of a basal clastic aquifer in regional scale fluid circulation during hydrothermal dolomitization. Furthermore, the presence of the Stephen Formation shale above the platform facilitated the build-up of fluid pressure during the final phase of dolomitization, leading to the formation of saddle dolomite cemented breccias at much shallower depths than previously realized.
关键词	CANADIAN ROCKY-MOUNTAINS RARE-EARTH-ELEMENTS HAMMAM FARAUN FAULT BRITISH-COLUMBIA KICKING HORSE BURGESS SHALE NOBLE-GASES PERITIDAL CARBONATES HIGH-TEMPERATURE MAESTRAT BASIN
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000715022900001
来源期刊	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254695
作者单位	[Stacey, Jack; Holland, Greg; Koeshidayatullah, Ardiansyah; Hollis, Cathy] Univ Manchester, Dept Earth & Environm Sci, Manchester M13 9PL, Lancs, England; [Corlett, Hilary] MacEwan Univ, Dept Phys Sci, Edmonton, AB T5J 4S2, Canada; [Cao, Chunhui] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; [Swart, Peter] Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, Coral Gables, FL 33149 USA; [Crowley, Stephen] Univ Liverpool, Dept Earth Sci, Liverpool L69 3GP, Merseyside, England
推荐引用方式 GB/T 7714	Stacey, Jack,Corlett, Hilary,Holland, Greg,et al. Regional fault-controlled shallow dolomitization of the Middle Cambrian Cathedral Formation by hydrothermal fluids fluxed through a basal clastic aquifer[J]. 中国科学院西北生态环境资源研究院,2021,133(11-12).
APA	Stacey, Jack.,Corlett, Hilary.,Holland, Greg.,Koeshidayatullah, Ardiansyah.,Cao, Chunhui.,...&Hollis, Cathy.(2021).Regional fault-controlled shallow dolomitization of the Middle Cambrian Cathedral Formation by hydrothermal fluids fluxed through a basal clastic aquifer.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,133(11-12).
MLA	Stacey, Jack,et al."Regional fault-controlled shallow dolomitization of the Middle Cambrian Cathedral Formation by hydrothermal fluids fluxed through a basal clastic aquifer".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 133.11-12(2021).