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Pyroxene and mica found in plutonic rocks of the Little Murun ultrapotassic pluton exhibit trends of compositional evolution that permit evaluation of the differentiation sequence of the complex. Pyroxene evolves from diopside in kalsilite and phlogopite pyroxenites through aegirine-diopside in shon...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.624.7198 2023-05-15T18:45:00+02:00 AND Mica Roger H. Mitchell Nikolai V. Vladykin The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.624.7198 http://www.minersoc.org/pages/Archive-MM/Volume_60/60-403-907.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.624.7198 http://www.minersoc.org/pages/Archive-MM/Volume_60/60-403-907.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.minersoc.org/pages/Archive-MM/Volume_60/60-403-907.pdf diopside phlogopite kalsilite ultrapotassic alkaline complex Yakutia Russia text ftciteseerx 2016-01-08T15:10:05Z Pyroxene and mica found in plutonic rocks of the Little Murun ultrapotassic pluton exhibit trends of compositional evolution that permit evaluation of the differentiation sequence of the complex. Pyroxene evolves from diopside in kalsilite and phlogopite pyroxenites through aegirine-diopside in shonkinite to aegirine in late stage charoitite and evolved hypabyssal rocks. The compositional trend is unusual in that the hedenbergite content of the pyroxenes never exceeds 15 mol. % and is thus unlike pyroxene compositional trends found in sodic alkaline complexes. Mica is A1- and Ti-poor and ranges in composition from Fe-rich phlogopite through biotite towards tetraferriannite. Compositional trends of mica found in 'lamproite-like' hypabyssal rocks are identical to those observed in the micaceous plutonic rocks; hence the former are considered tobe representatives of the lamprophyric facies of the magmas which formed the plutonic series. Text Yakutia Unknown |
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diopside phlogopite kalsilite ultrapotassic alkaline complex Yakutia Russia |
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diopside phlogopite kalsilite ultrapotassic alkaline complex Yakutia Russia Mica Roger H. Mitchell Nikolai V. Vladykin AND |
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diopside phlogopite kalsilite ultrapotassic alkaline complex Yakutia Russia |
description |
Pyroxene and mica found in plutonic rocks of the Little Murun ultrapotassic pluton exhibit trends of compositional evolution that permit evaluation of the differentiation sequence of the complex. Pyroxene evolves from diopside in kalsilite and phlogopite pyroxenites through aegirine-diopside in shonkinite to aegirine in late stage charoitite and evolved hypabyssal rocks. The compositional trend is unusual in that the hedenbergite content of the pyroxenes never exceeds 15 mol. % and is thus unlike pyroxene compositional trends found in sodic alkaline complexes. Mica is A1- and Ti-poor and ranges in composition from Fe-rich phlogopite through biotite towards tetraferriannite. Compositional trends of mica found in 'lamproite-like' hypabyssal rocks are identical to those observed in the micaceous plutonic rocks; hence the former are considered tobe representatives of the lamprophyric facies of the magmas which formed the plutonic series. |
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The Pennsylvania State University CiteSeerX Archives |
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Text |
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Mica Roger H. Mitchell Nikolai V. Vladykin |
author_facet |
Mica Roger H. Mitchell Nikolai V. Vladykin |
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Mica |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.624.7198 http://www.minersoc.org/pages/Archive-MM/Volume_60/60-403-907.pdf |
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Yakutia |
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Yakutia |
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http://www.minersoc.org/pages/Archive-MM/Volume_60/60-403-907.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.624.7198 http://www.minersoc.org/pages/Archive-MM/Volume_60/60-403-907.pdf |
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