A new ;model for Proterozoic ocean chemistry
Article Abstract:
The downwelling of cold high-latitude surface waters saturated with oxygen in the modern ocean, leads to largely aerobic bottom waters. A simple three-box model has been developed with regard to the ice age ocean, and has been used to examine the regulation of the oxygen content of deep ocean waters. It is argued that anoxic bottom waters may have persisted until after the cessation of banded iron formation deposition, and it is proposed that sulphide was responsible for removing iron from deep ocean water, rather than oxygen.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Proterozoic depletion of the lithosphere recorded in mantle xenoliths from Inner Mongolia
Article Abstract:
Isotopic analysis of mantle xenoliths from Inner Mongolia in China indicates that this portion of the lithosphere has not been altered chemically since melting and depletion took place in the Proterozoic era about 1.6 billion years ago. This is the first evidence of a part of the lithosphere having been cut off from outside influence for so long. The neodymium and strontium isotopes in samples of clinopyroxene show also that the lithosphere in this region lay under a fold belt during the Proterozoic depletion.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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A mechanism for decoupling within the oceanic lithosphere revealed in the Troodos ophiolite
Article Abstract:
A kinematic model of the decoupling zone that separates deformation between sheeted dykes and plutonics of the Troodos ophiolite provides insight into the mechanical evolution of oceanic spreading centers. The model generates multiple, horizontal decoupling surfaces connected by planar normal faults during sea-floor spreading. This model does not agree with low-angle detachment models for slow spreading ridges based on the continental rift analogues.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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