Journal ArticleDOI
Synthesis of majorite and other high pressure garnets and perovskites
A.E. Ringwood,Alan Major +1 more
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In this paper, a series of new high pressure garnets containing sodium and/or titanium was synthesized at a pressure of 250-300 kb of the majorite, previously found to occur as a shock produced phase in a chondritic meteorite.About:
This article is published in Earth and Planetary Science Letters.The article was published on 1971-12-01. It has received 205 citations till now. The article focuses on the topics: Majorite & Perovskite (structure).read more
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Theory of the Earth
TL;DR: Theory of the Earth as mentioned in this paper is a theory of the origin, composition, evolution, and evolution of the entire Earth from the perspective of geology, petrology, mineralogy, geochemistry, geodesy, and seismology.
MonographDOI
Deep-seated inclusions in kimberlites and the problem of the composition of the upper mantle
Journal ArticleDOI
The population genetics of ecological specialization in evolving Escherichia coli populations
TL;DR: This work analysed the decay of unused catabolic functions in 12 lines of Escherichia coli propagated on glucose for 20,000 generations and found that antagonistic pleiotropy appears more important than mutation accumulation for the Decay of unused dogmatic functions in these populations.
Journal ArticleDOI
The possible subduction of continental material to depths greater than 200 km
Kai Ye,Bolin Cong,Danian Ye +2 more
TL;DR: The observation of high concentrations of clinopyroxene, rutile and apatite exsolutions in garnet within eclogites from Yangkou in the Sulu UHP metamorphic belt, China is interpreted as resulting from the high-pressure formation of pyroxene solid solutions in subducted continental material.
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Journal ArticleDOI
Phase transformations and the constitution of the mantle
TL;DR: In this article, the authors present a review of the constitution of the mantle between depths of 200 and 1200 km in the light of recent high pressure experimental investigations on silicates and on their germanate analogues, concluding that the rapid increase of seismic velocity around 350-450 km is caused mainly by the transformation of olivine into a spinel-like structure and by transformation of pyroxenes into a new kind of garnet structure characterized by octahedral coordination of a substantial proportion of silicon atoms.
Journal ArticleDOI
The pyroxene-garnet transformation in the earth's mantle
TL;DR: In this article, the solid solubility of pyroxenes in garnet structures in the pressure range 0-250 kb and at about 900°C was investigated, and the results imply the occurrence of a pyroxene-garnet transformation, in which the garnets are characterized by partial 6-fold coordination of silicon.
Journal ArticleDOI
Reflection of P′P′ seismic waves from discontinuities in the mantle
TL;DR: A study of the travel times and apparent velocities of precursors of the seismic core phase PKPPKP indicate that these phases are reflections from the mantle as discussed by the authors.
Journal ArticleDOI
Pyroxene-Garnet Transformation in Coorara Meteorite
Joseph V. Smith,Brian Mason +1 more
TL;DR: The similar mineralogy and texture of the Coorara and Tenham meteorites suggest a common parent body.
Journal ArticleDOI
Ringwoodite, Natural (Mg,Fe) 2 SiO 4 Spinel in the Tenham Meteorite
TL;DR: Ringwoodite as mentioned in this paper is a spinel polymorph of olivine, which is the first authentic natural occurrence of the ringwoodite mineral and was proposed by A. E. Ringwood, Australian National University.
Related Papers (5)
Pyroxene-garnet solid-solution equilibria in the systems Mg4Si4O12Mg3Al2Si3O12 and Fe4Si4O12Fe3Al2Si3O12 at high pressures and temperatures
Masaki Akaogi,Syun-iti Akimoto +1 more