NDLI: Depositional environment of the evaporitic unit (D-member) of the Qom Formation (Central Iran)

Content Provider	Springer Nature Link
Author	Khalili, Mahmoud Beavers, Roy Torabi, Hosein
Copyright Year	2007
Abstract	The Qom Formation, in the Central basin of Iran, is characterized by shallow marine limestone and lagoonal facies. The D-member, one of the six major members of the Formation, is dominated by gypsum (anhydrite). Several types of textural and structural features have been recognized in this unit. Nodular anhydrite, gypsum veins, enterolithic structure, and gypsum crust are the most common gypsum (anhydrite) facies. Petrographically, the gypsum rocks display an entire array of textures ranging from cloudy ameboid (xenotopic) to idiotopic crystals. The presence of these textures together with satin spar crystals represent the cycles of dehydration-rehydration process. Rehydration event possibly took place due to increasing heat flow related to emplacement of Tertiary volcanic bodies. Rehydration occurred when the Qom basin was uplifted and the D-member exposed to ground and/or meteoric water.The gypsum unit as well as the accompanied clay impurities are enriched in some elements (i.e., Mg, Ti, and Sr). Therefore a possible link between volcanic activity and the elements enrichment may be proposed.The unit displays some shallow water evaporite textures and it is typically cyclic, these features suggest a saltern environment type for the deposition of D-member.
Starting Page	101
Ending Page	112
Page Count	12
File Format	PDF
ISSN	08912556
Journal	Carbonates and Evaporites
Volume Number	22
Issue Number	2
e-ISSN	18785212
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	D-member Qom Formation Central Iran Evaporite unit Saltern environment Geology Mineral Resources Mineralogy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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