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Mineral chemistry and geochronology of the potassic alkaline ultramafic Inagli complex, Aldan Shield, eastern Siberia

Published online by Cambridge University Press:  05 July 2018

U. Mues-Schumacher ,
J. Keller ,
V. A. Kononova  and
P. J. Suddaby
U. Mues-Schumacher
Affiliation:
Min.-Pet. Institut, Alberstr. 23b, 79104 Freiburg, Germany
J. Keller
Affiliation:
Min.-Pet. Institut, Alberstr. 23b, 79104 Freiburg, Germany
V. A. Kononova
Affiliation:
IGEM, Staromonetny 35, 109017 Moscow, Russia
P. J. Suddaby
Affiliation:
Dept. of Geology, Imperial College, Prince Consort Road, London SW7 2BP, UK
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Abstract

The Inagli complex, one of several Mesozoic intrusive complexes of the Aldan Shield (Siberian Platform), exhibits a concentric structure comprising several alkaline ultramafic rock-types. A central dunite body is surrounded by olivine- and phlogopite-clinopyroxenites forming an inner rim. The outer rim consists of different shonkinitic and malignitic rocks. The K-Ar ages obtained for the whole complex vary around 132 Ma.

The dunites and clinopyroxenites are characterized by cumulate textures. With increasing modal abundances of clinopyroxene and subordinate phlogopite, the rocks develop to olivine-clinopyroxenite, shonkinite, and malignite with intercumulus potassium feldspar. Mineralogical characterization of the rocks suggests they evolved by fractional crystallization. The highly forsteritic olivines (Fo up to 95) require a melt as magnesian as mg# 87.1, representing ±26 wt.% MgO. The parental melt is likely to be an olivine-, H2O- and K2O-rich picritic liquid of shoshonitic character. Major and trace element systematics show high LILE/LREE and LREE/HFSE ratios indicating the involvement of a subduction zone component in the genesis of these rocks.

Keywords

Inagli intrusive complexalkalineultramafichigh-MgO parent-meltsubduction zone componentAldan ShieldSiberia
Type
Petrology
Information
Mineralogical Magazine , Volume 60 , Issue 402 , October 1996 , pp. 711 - 730
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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Footnotes

*

Present address: Hauptstr. 3, D-71672, Marbach, Germany

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