The origin of celestite in deep-sea carbonate sediments

Online Access: Get full text
doi: 10.1016/0016-7037(88)90088-9
Author(s): Baker, Paul A.; Bloomer, Sherman H.
Author Affiliation(s): Primary:
Duke Univ., Dep. Geol., Durham, NC, United States
Volume Title: Geochimica et Cosmochimica Acta
Source: Geochimica et Cosmochimica Acta, 52(2), p.335-339. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037 CODEN: GCACAK
Note: In English. 29 refs.; illus. incl. 3 tables
Summary: Celestite nodules were examined from DSDP Leg 90, Lord Howe Rise, SW Pacific, and pore-water samples were analysed for dissolved sulphate, P, K+, Ca2+, Mg2+, Ba2+, Sr2+. The mineralogy of the nodules was checked by XRD and optically, and powdered samples analysed by XRF. The celestites contain = or <8 mol.% BaSO4 and approx 7 mol.% CaSO4, which are unusually high. Dissolved Sr concentrations increase downcore reaching a plateau of approx 10 X sea-water at depths of approx 100 m sub-bottom. Ba concentrations are similar in behaviour, and Ba and Sr may be controlled by similar geochemical processes in these very pure calcareous oozes and chalks. These sediments undergo relatively rapid burial diagenesis with expulsion of Sr to interstitial waters. Ion activity products of Sr and sulphate were calculated, and the measured concentrations of pore-water constituents are close to the celestite solubility product, which increases with water depth.
Year of Publication: 1988
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Alkaline earth metals; Burial diagenesis; Carbonate rocks; Carbonate sediments; Celestine; Chalk; Clastic sediments; Deep Sea Drilling Project; Diagenesis; Environment; Geochemistry; IPOD; Leg 90; Lord Howe Rise; Marine environment; Metals; Mineral composition; Oceanography; Ooze; Pacific Ocean; Pore water; Processes; Sedimentary rocks; Sedimentation; Sediments; South Pacific; Southwest Pacific; Strontium; Sulfates; West Pacific
Coordinates: S453129 S211153 E1745653 E1611336
Record ID: 1988027910
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom