Wilson, Paul A. and Dickson, J. A. D. (1996): Radiaxial calcite; alteration product of and petrographic proxy for magnesian calcite marine cement

Leg/Site/Hole:
ODP 144
ODP 144 877
Identifier:
1996-078421
georefid
10.1130/0091-7613(1996)024<0945:RCAPOA>2.3.CO;2
doi
Creator:
Wilson, Paul A.
University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
author
Dickson, J. A. D.
author
Identification:
Radiaxial calcite; alteration product of and petrographic proxy for magnesian calcite marine cement
1996
Geology (Boulder)
Geological Society of America (GSA), Boulder, CO, United States
24
10
945-948
Radiaxial calcite is a common and distinctive pore fill in ancient limestones, but the origin of this fabric is highly controversial. We present data from the Late Cretaceous equatorial Pacific that suggest that radiaxial calcite forms through alteration of early magnesian calcite (> or =7 mol% MgCO (sub 3) ) marine cement. These data suggest that radiaxial calcites are not straightforward indicators of pore-fluid chemistry. On the other hand, the presence of radiaxial calcite in limestones may provide a distinctive petrographic proxy for earlier magnesian calcite cement and thus a generally warm CaCO (sub 3) -saturated marine environment.
English
Serial
Coverage:Geographic coordinates:
North:13.0000
West:164.3000East: 166.0000
South:11.3000
Isotope geochemistry; Sedimentary petrology; Mineralogy of non-silicates; alkaline earth metals; C-13/C-12; calcite; carbon; carbonate platforms; carbonate rocks; carbonates; cement; Cretaceous; crystal growth; diagenesis; Equatorial Pacific; fabric; geochemistry; isotope ratios; isotopes; Leg 144; limestone; magnesium; marine environment; Marshall Islands; Mesozoic; metals; Micronesia; North Pacific; Northwest Pacific; O-18/O-16; Ocean Drilling Program; Oceania; ODP Site 877; oxygen; Pacific Ocean; petrography; pore water; porosity; seamounts; sedimentary rocks; stable isotopes; strontium; Upper Cretaceous; West Pacific; Wodejebato Seamount;
.