Journal
GEOLOGY
Volume 42, Issue 2, Pages 135-138Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G35068.1
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Funding
- National Science Foundation (NSF) [OCE-1059534]
- German Research Foundation (DFG) [BA 1605/8-1]
- Cluster of Excellence, The Ocean in the Earth System
- NSF Division of Earth Science
- Directorate For Geosciences
- Division Of Earth Sciences [1339505, 1028690] Funding Source: National Science Foundation
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Serpentinization of mantle peridotite generates molecular hydrogen that can be exploited by microorganisms to gain metabolic energy; however, the mechanisms that control hydrogen generation and magnetite formation during serpentinization remain poorly understood. We have examined partly to completely serpentinized peridotites recovered during the Ocean Drilling Program and find a remarkable variation in the abundance of magnetite. Some completely serpentinized peridotites have as much as 6.15 wt% magnetite, whereas others are nearly magnetite free (<0.04 wt%). Using isotopic, magnetic, and thermodynamic constraints, our study reveals a simple link between the abundance of magnetite, Fe content of brucite, and serpentinization temperature. Samples with abundant magnetite have Fe-poor brucite and were formed at temperatures of 200-300 degrees C, whereas magnetite-poor samples are associated with Fe-rich brucite and were formed at temperatures
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