The importance of sediment composition and early diagenesis on the later development of pressure solution in periplatform carbonates, ODP Leg 166, Sites 1003 and 1007

Author(s): Melim, Leslie A.; Haggitt, Kimberly M.; Wamsley, Melinda
Author Affiliation(s): Primary:
Western Illinois University, Macomb, IL, United States
Volume Title: AAPG annual meeting
Source: Annual Meeting Expanded Abstracts - American Association of Petroleum Geologists, Vol.13, p.96; AAPG annual meeting, Dallas, TX, April 18-21, 2004. Publisher: American Association of Petroleum Geologists and Society for Sedimentary Geology, Tulsa, OK, United States. ISSN: 0094-0038 CODEN: APGAB2
Note: In English
Summary: ODP Leg 166 Sites 1003 and 1007 each recovered over 1200 m of slope facies along the western margin of Great Bahama Bank. The sediments alternate between dark, calcitic, pelagic-rich wackestones and lighter wackestones to grainstones with both aragonitic bank-derived bioclasts and pelagic components. Early marine-burial diagenesis is distinctly different in light layers. The light layers, with their initially greater aragonite content, were cemented early, while the dark layers remained unaltered to greater depths. Pressure solution in ODP Leg 166 is mainly seen as dissolution seams starting at depths of around 900 m but not becoming obvious until below 1000 m. Although the dark layers show minor seams at shallower depths (700-900), well developed seams appear in both layers at about the same depth. Fitted-fabric (also known as sutured contacts) appears in selected dark layers at significantly shallower depths (to 500 m) than the true seams. Despite an originally grain-supported fabric, the early cementation of the light layers protected them from compaction and distributed the pressure during burial. The uncemented dark layers compacted easily, sometimes changing a matrix-supported fabric to a grain-supported fabric where larger bioclasts (mainly foraminifers) concentrated pressure at grain-to-grain contacts. The effective pressure for the fitted-fabrics is approximately the same as that required for dissolution seams. The shallower depth is caused by the concentrated pressure of the grain-to-grain contacts which is allowed by the lack of early cementation. This distinction could help explain the widely varying depths suggested for onset of pressure solution in the literature.
Year of Publication: 2004
Research Program: ODP Ocean Drilling Program
Key Words: 06 Petrology, Sedimentary; Aragonite; Atlantic Ocean; Burial diagenesis; Calcite; Carbonate platforms; Carbonate rocks; Carbonates; Cementation; Clasts; Composition; Diagenesis; Early diagenesis; Fabric; Foraminifera; Grainstone; Great Bahama Bank; Invertebrata; Leg 166; Matrix; Microfossils; North Atlantic; ODP Site 1003; ODP Site 1007; Ocean Drilling Program; Pressure solution; Protista; Sedimentary rocks; Sediments; Variations; Wackestone
Coordinates: N243245 N243245 W0791539 W0791539
N243016 N243016 W0791921 W0791921
Record ID: 2006087327
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States