(Table T1) Geochemical composition of tochilinite and related minerals of ODP Hole 173-1068A

Tochilinite (approximately FeS(Mg,Fe)(OH)2) is locally abundant in Hole 1068A serpentinites from Cores 173-1068A-21R and 22R. It occurs in veins, as fillings in void space, and in intergrowths with serpentine and andradite. An apparently related mineral, but with Ca and Al largely replacing Mg, occu...

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Bibliographic Details
Main Author: Beard, James S
Format: Dataset
Language:English
Published: PANGAEA 2000
Subjects:
173-1068A
Aluminium
Aluminium oxide
Calcium
Calcium oxide
CAMECA electron microprobe
Cobalt
Copper
Description
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
Elements
total
Iron
Iron oxide
FeO
Joides Resolution
Leg173
Magnesium
Magnesium oxide
Nickel
North Atlantic Ocean
Ocean Drilling Program
ODP
Piece
Ratio
Sample code/label
Silicon dioxide
Sulfur
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.787722
https://doi.org/10.1594/PANGAEA.787722
Description
Summary:Tochilinite (approximately FeS(Mg,Fe)(OH)2) is locally abundant in Hole 1068A serpentinites from Cores 173-1068A-21R and 22R. It occurs in veins, as fillings in void space, and in intergrowths with serpentine and andradite. An apparently related mineral, but with Ca and Al largely replacing Mg, occurs in association with, and possibly as a replacement of, pyrrhotite in serpentinite breccias from the bottom of Core 173-1068A-20R. The transition from Mg-Fe-rich brucite tochilinites to Ca- and S-rich carbonate tochilinites is consistent with increasing sulfur and oxygen activity upsection. Tochilinite has been reported at other sites on the Iberia Abyssal Plain and is abundant to the point of being a rock-forming mineral in several samples from Site 1068. Rather than being a mineralogical curiosity, tochilinite appears to be common and a major sink for sulfur in the upper serpentinites of the Iberia Abyssal Plain.

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