(Table 1) Interstitial water chemistry at DSDP Leg 76 Holes

Low salinities and strong opposing fluctuations between chlorinity and interstitial water d18O and dD characterize the region of gas-hydrate occurrence at Site 533. In addition to the hydrate recovered from 243 m sub-bottom, thin, diffuse layers of hydrate composing about 10% of the total pore space...

Full description

Bibliographic Details
Main Authors: Jenden, Peter D, Gieskes, Joris M
Format: Dataset
Language:English
Published: PANGAEA 1983
Subjects:
76-533
76-533A
76-534A
Alkalinity
total
Ammonium
Calcium
Chlorine
Deep Sea Drilling Project
DEPTH
sediment/rock
DRILL
Drilling/drill rig
DSDP
DSDP/ODP/IODP sample designation
Elevation of event
Event label
Glomar Challenger
Latitude of event
Leg76
Lithium
Longitude of event
Magnesium
Mass spectrometry
North Atlantic/BASIN
North Atlantic/RIDGE
pH
Potassium
Salinity
Sample code/label
see reference(s)
Silicon
Strontium
Sulfate
δ18O
water
δ Deuterium
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.809833
https://doi.org/10.1594/PANGAEA.809833
Description
Summary:Low salinities and strong opposing fluctuations between chlorinity and interstitial water d18O and dD characterize the region of gas-hydrate occurrence at Site 533. In addition to the hydrate recovered from 243 m sub-bottom, thin, diffuse layers of hydrate composing about 10% of the total pore space may have been cored around 290 m. Decomposition during recovery could account for the high oxygen isotope value (+2.80 per mil) and low chlorinity (17.21 g/kg) observed at this depth. High alkalinity and dissolved ammonia (71 meq/l and 33 mM, respectively) indicate substantial microbial activity. Chlorinity gradually increases with depth in the 1600-m-thick sediment column at Site 534, perhaps due to deepseated alteration-hydration reactions or to the presence of nearby evaporites. d18O and dD decrease with depth and are well correlated, suggesting that a common mechanism is fractionating both.

Similar Items