干旱区生态环境知识资源中心(Arid): Examining the interplay of climate and low amplitude sea-level change on the distribution and volume of massive dolomitization: Zebbag Formation, Cretaceous, Southern Tunisia

Arid

DOI	10.1002/dep2.25
	Examining the interplay of climate and low amplitude sea-level change on the distribution and volume of massive dolomitization: Zebbag Formation, Cretaceous, Southern Tunisia
	Newport, Richard; Hollis, Cathy; Bodin, Stephane; Redfern, Jonathan
通讯作者	Hollis, C
来源期刊	DEPOSITIONAL RECORD
ISSN	2055-4877
出版年	2017
卷号	3 期号:1 页码:38-59
英文摘要	During the Cretaceous, a humid global climate, calcitic seas, high relative sea-level and low amplitude changes in relative sea-level largely prevented large-scale dolomitization in many carbonate successions. However, the well-exposed shallow-water carbonate sediments of the Upper Albian-Lower Turonian Zebbag Formation on the Jeffara Escarpment, southern Tunisia, are pervasively dolomitized. This study considers why dolomitization was so widespread in this region during a period of Earth history when platform-scale dolomitization is rare. Marine conditions were established in the Upper Albian, evidenced by stacked upward-shallowing packages of shallow subtidal to peritidal carbonate sediments in the basal Rhadouane Member. A gradual increase in the volume of subtidal sediments in the Cenomanian Kerker Member, culminated in deposition of laterally extensive marls, during maximum flooding of the platform in the Lower Turonian. The overlying Gattar Member was then deposited in shallower water as relative sea-level fell. The entire Zebbag Formation is pervasively replaced by stratabound, fabric-retentive, dolomite, except within the marl at the top of the Kerker Member, which is only partially dolomitized. Petrographic textures indicate dolomitization largely post-dated marine cementation and platform emergence but pre-dated chemical compaction. Slightly more positive oxygen isotope signatures, slightly elevated concentrations of Sr and a near-absence of evaporites are consistent with dolomitization by reflux of mesohaline sea water. An upward-decrease in major element concentrations and higher Sr-87/Sr-86 compared to Upper Cretaceous sea water suggest that basal, Albian siliciclastic beds acted as aquifers facilitating dolomitization by fluxing fluids offshore. Dolomitization is interpreted to have resulted from multiple fluxes of sea water over periods of 0.5 to 2.5Ma. The unusually high volume of dolostone for a platform of this age most probably reflects deposition within an arid climate belt, where an efficient reflux system was facilitated by basal, permeable siliciclastic strata.
英文关键词	Cretaceous dolomitization mesosaline Sahara platform
类型	Article
语种	英语
开放获取类型	DOAJ Gold, Green Published
收录类别	ESCI
WOS记录号	WOS:000404898100002
WOS关键词	CENOMANIAN-TURONIAN BOUNDARY ; UPPER-KNOX GROUP ; NORTH-AFRICA ; SURFACE TEMPERATURES ; CARBONATE PLATFORMS ; NEIGHBORING REGIONS ; DOLOMITE ABUNDANCE ; POROSITY EVOLUTION ; ISOTOPIC ANALYSIS ; BRINE REFLUX
WOS类目	Geology
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/332164
作者单位	[Newport, Richard; Hollis, Cathy; Redfern, Jonathan] Univ Manchester, Sch Earth & Environm Sci, Manchester M13 9PL, Lancs, England; [Bodin, Stephane] Aarhus Univ, Dept Geosci, Hoegh Guldbergs Gade 2, DK-8000 Aarhus C, Denmark
推荐引用方式 GB/T 7714	Newport, Richard,Hollis, Cathy,Bodin, Stephane,et al. Examining the interplay of climate and low amplitude sea-level change on the distribution and volume of massive dolomitization: Zebbag Formation, Cretaceous, Southern Tunisia[J],2017,3(1):38-59.
APA	Newport, Richard,Hollis, Cathy,Bodin, Stephane,&Redfern, Jonathan.(2017).Examining the interplay of climate and low amplitude sea-level change on the distribution and volume of massive dolomitization: Zebbag Formation, Cretaceous, Southern Tunisia.DEPOSITIONAL RECORD,3(1),38-59.
MLA	Newport, Richard,et al."Examining the interplay of climate and low amplitude sea-level change on the distribution and volume of massive dolomitization: Zebbag Formation, Cretaceous, Southern Tunisia".DEPOSITIONAL RECORD 3.1(2017):38-59.