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The origin of shoshonites: New insights from the Tertiary high-potassium intrusions of eastern Tibet

Campbell, Ian; Stepanov, Aleksandr; Liang, Hua-Ying; Allen, Charlotte M; Norman, Marc; Zhang, Yu-Qiang; Xie, Ying-Wen

Description

The shoshonitic intrusions of eastern Tibet, which range in age from 33 to 41 Ma and in composition from ultramafic (SiO2 = 42 %) to felsic (SiO2 = 74 %), were produced during the collision of India with Eurasia. The mafic and ultramafic members of the suite are characterized by phenocrysts of phlogopite, olivine and clinopyroxene, low SiO2, high MgO and Mg/Fe ratios, and olivine forsterite contents of Fo87 to Fo93, indicative of equilibrium with mantle olivine and orthopyroxene. Direct melting...[Show more]

CollectionsANU Research Publications
Date published: 2014
Type: Journal article
URI: http://hdl.handle.net/1885/69197
Source: Contributions to Mineralogy and Petrology
DOI: 10.1007/s00410-014-0983-9

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