Carbonate recrystallization in basal sediments; evidence for convective fluid flow on a ridge flank

Author(s): Kastner, Miriam; Gieskes, Joris M.; Hu, Jine-Yu
Author Affiliation(s): Primary:
Scripps Inst. Oceanogr., La Jolla, CA, United States
Volume Title: Nature (London)
Source: Nature (London), 321(6066), p.158-161. Publisher: Macmillan Journals, London, United Kingdom. ISSN: 0028-0836 CODEN: NATUAS
Note: In English. 27 refs.; illus.
Summary: Analyses of carbonate sediments cored on 4.6 m.y.-old oceanic crust on the W flank of the East Pacific Rise during DSDP Leg 92, and of chalks recovered from directly overlying oceanic basement at 8 m below the sediment-water interface, show that calcite recrystallized in an aqueous medium, such as normal sea-water, at relatively low T. This suggests that the observed recrystallization of calcareous ooze to chalk and limestone occurred as a result of extensive advective pore-water flow through the sediments, allowing recrystallization to take place. This process is widespread in the SE Pacific.
Year of Publication: 1986
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 07 Marine Geology and Oceanography; Advection; Calcite; Carbonate rocks; Carbonate sediments; Carbonates; Cementation; Cenozoic; Clastic sediments; Convection; Cores; DSDP Site 600; Deep Sea Drilling Project; Diagenesis; East Pacific; East Pacific Rise; IPOD; Leg 92; Limestone; Marine environment; Marine sediments; Mid-ocean ridges; Neogene; Oceanography; Ooze; Pacific Ocean; Pleistocene; Pliocene; Pore water; Quaternary; Recrystallization; SEM data; Sedimentary rocks; Sedimentation; Sediments; Solution; Tertiary
Coordinates: S185542 S185542 W1165027 W1165027
Record ID: 1986073566
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom