...Shan-Rong Zhao; Ge-Ge Zhang; Hui Sun; Roger Mason; Xu He Abstract Exsolution lamellae in pyroxene occurring in mantle lherzolite xenoliths in Cenozoic basalts from the Mingxi area, Fujian Province, China, have been investigated by electron backscattered diffraction (EBSD) to determine epitaxial...

... lamellae of cummingtonite. AEM analyses indicate that the present pair of coexisting sodic-ferromagnesian amphiboles differs significantly from all previously reported pairs and represents the first report of coexisting glaucophane-cummingtonite from normal eclogitic assemblages. The lamellae are disc...

... generations of exsolution lamellae. After pigeonite crystallization at ca. 1150 °C, the first exsolution process generated the thick augite lamellae along (100) in the temperature interval 1000–900 °C. By further cooling, a second order of exsolution lamellae formed within augite along (001), consisting...

... that these modulations are due to chemical variation rather than strain or diffraction contrast. The Ca-rich lamellae are Mg-rich calcite with compositions ranging from Ca 0.85 Mg 0.15 CO 3 to Ca 0.70 Mg 0.30 CO 3 . The observed results indicate that these Ca-rich exsolution lamellae formed during diagenesis...

... the significance of these systematic variations of Mg composition of calcite to aid the interpretation of contact metamorphic temperatures recorded in carbonates. We developed forward models to evaluate the effect of growth zoning, volume diffusion, and the formation of submicroscopic exsolution lamellae (<1 μm...

... exsolution began. Previous work has indicated that edge dislocations would start to form during cooling at ≤400 °C, so that nanotunnels form at still lower T . Dry heating experiments were carried out to establish the stability of the defects and the homogenization behavior of the exsolution lamellae. Na ↔ K...

...Stephan Weinbruch; Volker Styrsa; Thomas Dirsch Abstract The size distribution of pigeonite and diopside exsolution lamellae on “001,” obtained at temperatures of 1100, 1200, and 1300 °C and annealing times between 2 and 4320 h, was studied by transmission electron microscopy. A total of 5192...

... analyses show that manganotantalite lamellae are variable in composition. Primary microlite (Ta 2 O 5 82%, 1.97 Ta a.p.f.u.) forms the matrix mineral between the lamellae. Textural relations suggest an exsolution origin for the lamellae. Manganotantalite is represented by three generations: (1) primary...

...Takeshi Kasama; Ute Golla-Schindler; Andrew Putnis Abstract The interfaces between fine-scale exsolution lamellae of hematite and ilmenite from an igneous rock in Rogaland, Norway have been studied by conventional transmission electron microscopy (TEM), high-resolution TEM, and energy-filtered TEM...

...Lifei Zhang; David J. Ellis; Wenbo Jiang Abstract Inclusions of coesite pseudomorphs in garnets have been found in type I eclogites interlayered with mafic blueschists and carbonate eclogites, and quartz exsolution lamellae in omphacites have been recognized in type II eclogites with pillow...

... nucleated at pre-existing albite-twin boundaries. Where no primary twin boundaries existed, exsolution lamellae of K-feldspar developed. This exsolution resulted in the formation of secondary albite-twin lamellae in the host plagioclase adjacent to the K-feldspar. A large range of orientations of exsolution...

... = 10.39(5), and c = 6.06(3) Å, and a = 4.87(5), b = 11.14(10), and c = 6.36(5) Å, respectively, from the precession photos. The PTS of olivine single crystals oriented parallel to (100) show exsolution lamellae of kirschsteinite up to 10 μ m in width. The two sets of lamellae are symmetrically related...

...John B. Brady Abstract Diffusional exchange between the wedge-shaped terminations of fine-scale, coherent exsolution lamellae and the large flat sides of adjacent like lamellae is proposed as the principal mechanism for the coarsening of lamellar exsolution textures in silicate minerals. Following...

...Timothy L. Grove Abstract Clinopyroxenes in Apollo 15 quartz-normative basalts (QNBs) are chemically complex recorders of thermal history. Texturally distinctive augite rims (Wo 30 En 42 ) mantle the clinopyroxene phenocrysts and contain submicroscopic exsolution lamellae of pigeonite and augite...

...Y. Miura; J. C. Rucklidge Abstract Combined data from electron microscope, electron microprobe, and ion microprobe analyzers can be used to determine the composition and thickness of lamellae in peristerite and cryptoperthite feldspars. Blue iridescent peristerite from Hybla, Ontario has a bulk...