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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 53 (1969)

Issue: 5. (May)

First Page: 1035

Last Page: 1042

Title: Detrital Dolomite in Onondaga Limestone (Middle Devonian) of New York: Its Implications to the "Dolomite Question"

Author(s): R. C. Lindholm (2)

Abstract:

Dolomite occurs in the matrix of the Onondaga Limestone (Middle Devonian) in New York as scattered grains ranging in size from 4 to 150 ยต. Detrital quartz is associated with the dolomite. Study of etched and stained thin sections shows a correlation in grain size between the dolomite and quartz. Limited data show a correlation in grain size among dolomite, quartz, and detrital calcite (silt to fine sand) matrix. In addition, there is a correlation in abundance between dolomite and quartz, where high dolomite values are present with high quartz values.

These data suggest that dolomite in the Onondaga is detrital. Source of the dolomite is uncertain, but reworked penecontemporaneous supratidal sediments and older (e.g., Silurian) dolomite are suggested possibilities. Wind is a likely mechanism for transport of the detritus.

Deposition of detrital dolomite followed by later diagenetic overgrowth on the detrital nuclei is suggested as a mechanism for "dolomitization." This process is compatible with three phenomena observed in dolomitic rocks: (1) association of insoluble detritus with dolomite, (2) presence of dolomite in fine-grained limestone, (3) fine-grained texture of dolomite interpreted as "primary" and coarse-grained texture of dolomite interpreted as "replacement." Two models for the origin of dolomitic rocks are proposed.

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