Nature research paper: Extreme redox variations in a superdeep diamond from a subducted slab
The introduction of volatile-rich subducting slabs to the mantle may locally generate large redox gradients, affecting phase stability, element partitioning and volatile speciation. Here we investigate the redox conditions of the deep mantle recorded in inclusions in a diamond from Kankan, Guinea. Enstatite , ferropericlase and a uniquely Mg-rich olivine inclusion indicate formation in highly variable redox conditions near the 660 km seismic discontinuity.
We propose a model involving dehydration, rehydration and dehydration in the underside of a warming slab at the transition zone–lower mantle boundary. Fluid liberated by dehydration in a crumpled slab, driven by heating from the lower mantle, ascends into the cooler interior of the slab, where the HO is sequestered in new hydrous minerals. Consequent fractionation of the remaining fluid produces extremely reducing conditions, forming Mg-end-member ringwoodite.
Malaysia Latest News, Malaysia Headlines
Similar News:You can also read news stories similar to this one that we have collected from other news sources.
Neil Sperry: Plant wildflower seeds when nature blends themNeil Sperry answers readers' gardening questions about sowing wildflower seeds, dried...
Read more »
Nonnegative spatial factorization applied to spatial genomics - Nature MethodsThis paper presents nonnegative spatial factorization, a general framework for spatially aware and interpretable dimension reduction for high-dimensional spatial data, and its application to spatial transcriptomics analysis.
Read more »
Metabolic regulation of species-specific developmental rates - NatureAn in vitro system that recapitulates temporal characteristics of embryonic development demonstrates that the different rates of mouse and human embryonic development stem from differences in metabolic rates and—further downstream—the global rate of protein synthesis.
Read more »
Disruptions to the hearing health sector - Nature MedicineTechnological innovation and changes to regulation are disrupting the hearing health sector, with implications for data privacy, product safety and accessibility, and provide challenges and opportunities for equitable hearing health.
Read more »
How mushrooms are touching all aspects of Utah culture, from house bills to natureFans of mushrooms in Utah are gathering on Facebook pages, talking about their shared passion for finding fungi.
Read more »
Meta-analysis on necessary investment shifts to reach net zero pathways in Europe - Nature Climate ChangeUrgent and targeted financial investments are essential for reaching the net zero target in Europe, while a comprehensive mapping is still missing. This meta-analysis demonstrates the necessity of rapid increase in investments and displays the potential patterns across various sectors.
Read more »