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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 38 (1968)No. 3. (September), Pages 755-765

Allogenic Quartz and the Origin of Penemosaic Texture in Evaporites of the Detroit River Formation (Middle Devonian) in Northern Indiana

Lawrence F. Rooney, Robert R. French

ABSTRACT

Many evaporite deposits contain contorted layers or masses of limestone or other rock types that completely envelope nodules of Previous HitanhydriteNext Hit or gypsum. The resulting texture has been called mosaic or "chicken wire." Previous HitAnhydriteNext Hit in the Detroit River Formation (Middle Devonian) of northern Indiana has a similar texture, but the thin, contorted layers of limestone do not form complete envelopes. The resulting texture is here defined as penemosaic.

Of the numerous theories proposed for the origin of mosaic and penemosaic textures of Previous HitanhydriteNext Hit, the two most probably correct are: (1) the interstitial precipitation of Previous HitanhydriteNext Hit in unlithified sediments; (2) the mixing of Previous HitanhydriteNext Hit and carbonate sediments by wave action and density settling. 'Massive replacement of carbonate rock by Previous HitanhydriteNext Hit has also been suggested for deposits closely resembling the Detroit River Previous HitanhydriteNext Hit.

A study of insoluble residues of 36 samples of Previous HitanhydriteNext Hit and gypsum and 47 samples of interbedded limestone layers and masses from 12 continuous cores through the Detroit River Formation in LaPorte County, Ind., provides convincing evidence that the penemosaic texture of the Detroit River Previous HitanhydriteTop is not a replacement phenomenon. Concentration of allogenic quartz in the interbedded limestone layers and masses suggests that they were deposited in a higher energy environment than were the enclosing sulfate rocks, the overlying limestone, or the underlying dolomite. Such an environment could have been produced under sebka conditions or by interruptions of lagoonal sedimentation.


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