Noble gas concentrations of oceanic crust and sediments from the Ninety East Ridge in the Indian Ocean

We have determined the concentrations and isotopic composition of noble gases in old oceanic crust and oceanic sediments and the isotopic composition of noble gases in emanations from subduction volcanoes. Comparison with the noble gas signature of the upper mantle and a simple model allow us to con...

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Bibliographic Details
Main Authors: Staudacher, Thomas, Allègre, Claude J
Format: Dataset
Language:English
Published: PANGAEA 1988
Subjects:
22-214
22-216
52-417D
52-418A
66-487
Deep Sea Drilling Project
Dredge
DRG
DRILL
Drilling/drill rig
DSDP
Glomar Challenger
Indian Ocean
Indian Ocean//RIDGE
Leg22
Leg52
Leg66
MD34-D2
North Atlantic/CONT RISE
North Pacific/TRENCH
East Ridge
Indian
Pacific
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.720987
https://doi.org/10.1594/PANGAEA.720987
Description
Summary:We have determined the concentrations and isotopic composition of noble gases in old oceanic crust and oceanic sediments and the isotopic composition of noble gases in emanations from subduction volcanoes. Comparison with the noble gas signature of the upper mantle and a simple model allow us to conclude that at least 98% of the noble gases and water in the subducted slab returns back into the atmosphere through subduction volcanism before they can be admixed into the earth's mantle. It seems that the upper mantle is inaccessible to atmospheric noble gases due to an efficient subduction barrier for volatiles.

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