Metastable Growth Patterns in Some Terrestrial and Lunar Rocks

  title={Metastable Growth Patterns in Some Terrestrial and Lunar Rocks},
  author={Harald Irving Drever and Robert Johnston},
With reference to new information on the textures in some terrestrial mafic and ultramafic igneous rocks of Tertiary age, textural patterns attributable to metastable crystallization are described, illustrated and reviewed. The igneous textural terminology, employed in the descriptive text, is reviewed and the use of certain new terms is advocated. Compared with these textural patterns are the skeletal crystal growth and intergrowth in igneous rock samples obtained, mainly by the Apollo 12… Expand
25 Citations
Geochemical studies on cumulus phases of some layered igneous rocks
This thesis presents the results of an investigation into the non-equilibrium distribution of trace constituents as a function of crystal growth. The ultrabasic igneous complex of Rhum (Scotland)Expand
Microstructures of metamorphic rocks
Introduction Once you have seen what the microstructures of sedimentary and igneous rocks look like, you are in a good position to appreciate what happens to them when they are heated (Chapter 4) andExpand
Microstructures of Igneous Rocks
Introduction This chapter is concerned with the shapes of crystals and aggregates formed when melted rocks and glass crystallize, solid rocks melt, and melts boil. These processes are broadly groupedExpand
Geochemistry of some ultramafic komatiite lava flows from the Barberton Mountain Land, South Africa☆
Thin ultramafic flows from the Komati Formation in the Barberton Greenstone Belt show striking textural variations similar to those found in some ultramafic flows from Munro Township, Ontario andExpand
Curved branching crystals and differentiation in comb-layered rocks
Layering in which one or more of the component minerals has grown perpendicular to layer boundaries occurs, under a variety of names, in volcanic, hypabyssal nad plutonic igneous rocks. The mostExpand
Ultrabasic rocks of Rhum and Skye: the nature of the parent magma
  • F. Gibb
  • Geology
  • Journal of the Geological Society
  • 1976
Rocks from the peridotite dykes of southern Skye (Gibb 1968) are virtually identical to those found in the large layered intrusions of Rhum and Skye, suggesting that they may have been formed in aExpand
Petrography, chemistry and distribution of platinum and palladium in ultramafic rocks of the Bird River Sill, SE Manitoba, Canada
The ultramafic portion of the Archean Bird River Sill, a mafic-ultramafic stratiform intrusion in southeastern Manitoba, is divided into a “lower” and an “upper” series. These series may be theExpand
Vitrification darkening of rock powders: implications for optical properties of the lunar surface
Laboratory experiments show that albedoes as low as those on the Moon can be produced by vacuum vitrification and associated chemical fractionation of ordinary terrestrial basaltic material.Expand
Petrology and evolution of the Northern part of the Rhum Ultrabasic Complex
The central region of the Rhum ul-trabasic complex comprises three major sequences of olivine, and plagioclase-olivine cirulates: (i) the westerly continuation of the Eastern Layered Series; (ii) theExpand
Ultrabasic Breccias in Layered Intrusions: The Rhum Complex
Two previously unmapped ultrabasic breccias-the Harris Bay and Ard Mheall breccias, in the Rhum layered complex-formed by upward intrusion of feldspathic peridotite magmas rather than by settling ofExpand


Some textures in Apollo 12 lunar igneous rocks and in terrestrial analogs.
The interpretation of immature crystallization and some lunar textures characterized by it are the principal objectives of this investigation. A comparative and selective approach is adopted, andExpand
The layered ultrabasic tocks of Rhum, Inner Hebrides
  • G. M. Brown
  • Biology
  • Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
  • 1956
The ultrabasic rocks of Rhum were re-mapped over an area of 3 square miles, including Hallival and Askival, the highest mountains of the island, to reconsider its manner of origin in the light of modern petrological research, especially recent work on layered intrusions. Expand
Erratum: Contrasting Archean ultramafic igneous bodies in Dundonald and Clergue Townships, Ontario
A differentiated sill of ultramafic and gabbroic rocks in Dundonald and Clergue Townships (25 miles northeast of Timmins, Ontario) may be classed as a "stratiform intrusion", whereas severalExpand
XXII.—The Petrology of Picritic Rocks in Minor Intrusions—a Hebridean Group.
The results are presented of a detailed petrological reconnaissance of a group of picritic minor intrusions in the Hebrides. A substantial amount of new factual data is subjected to a unifiedExpand
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The System CaO-MgO-FeO-SiO_2 and its Bearing on the Origin of Ultrabasic and Basic Rocks
Experimental data in the system CaO-MgO-FeO-SiO_2 suggest that there may be a plateau on the liquidus and solidus of the multicomponent system basalt-peridotite. If this is so, fusion of peridotiteExpand
Spherulitic textures in glassy and crystalline rocks
Spherulites are clusters of confocally radiating crystals that, contrary to the implication of their name, are not commonly spherical but usually resemble sheaves of wheat tied at the center. TheExpand
The layered ultrabasic rocks of south-west Rhum, Inner Hebrides
  • W. Wadsworth
  • Biology
  • Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
  • 1961
The present study was initiated in the Harris area, which covers the south-western part of the ultrabasic tract, because it was believed that the rocks exposed there represented a different level in the original intrusion, and that they would provide further evidence of the mode of formation. Expand
Effects of the changes in slope occurring on liquidus and solidus paths in the system diopside-anorthite-albite
Liquidus and solidus paths in the system diopside-anorthitc-albite exhibit changes in slope. When plagioclase crystallizes alone from a ternary liquid both paths arc steeper than in the systemExpand
Differing Powers of Crystal Nucleation as a Factor Producing Diversity in Layered Igneous Intrusions
"To account for a type of rhythmic unit found in the Bushveld complex of South Africa and probably in other layered intrusions, a hypothesis is put forward dependent on the different powers ofExpand