10.1594/PANGAEA.708724
Kastner, Miriam
Miriam
Kastner
Gieskes, Joris M
Joris M
Gieskes
Mineralogy and oxygen isotope values of silicified claystone and porcelanite from DSDP Hole 35-323
PANGAEA
1976
DEPTH, sediment/rock
Size fraction < 0.002 mm, clay
δ18O, water
Smectite
Illite
Quartz
Plagioclase
Drilling/drill rig
Leg35
Glomar Challenger
Deep Sea Drilling Project (DSDP)
1974-03-07T00:00:00
en
Supplementary Dataset
10.1016/0012-821X(76)90152-7
86 data points
text/tab-separated-values
Creative Commons Attribution 3.0 Unported
Discrepancies between predicted and observed interstitial water profiles for sites 322 and 323, Leg 35, Bellingshausen Abyssal Plain, were used to identify sites of reaction for further mineralogical and chemical investigations. Two major reaction sites were identified at site 323:
(1) In the silicification zone between 410 and 505 m depth, where dissolution of biogenic (opaline) silica, plagioclase and a few coccoliths and the formation of opal-CT, Mg-rich smectite and K-feldspar are responsible for the observed silica, Ca[2+], Mg[2+], and K[+] interstitial water gradients. Dissolution of biogenic silica provided most of the silica for the porcelanites.
(2) In the basalt, weathering of pyroxene and plagioclase and the formation of celadonite, smectite, calcite, and goethite are probably responsible for the observed Ca[2+], Mg[2+], and K[+] interstitial water gradients below the silicification zone.
The chemistry of authigenic smectites reflects the composition of their precursor(s).
Supplement to: Kastner, Miriam; Gieskes, Joris M (1976): Interstitial water profiles and sites of diagenetic reactions, Leg 35, DSDP, Bellingshausen abyssal plain. Earth and Planetary Science Letters, 33(1), 11-20
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Antarctic Ocean/PLAIN