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Open AccessArticle

The Role of Siliceous High-Magnesium Basalts during the Formation of a Neoproterozoic Mafic-Ultramafic Intrusion in the Tarim Craton (China)

1
School of Earth Science and Resources, Chang’an University, 126 Yanta Road, Xi’an 710054, China
2
Geophysical and Geochemical Exploration Corporation, Bureau of Geological Exploration for Nonferrous Metals in Northwest China, Xi’an 710068, China
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(11), 662; https://doi.org/10.3390/min9110662
Received: 18 September 2019 / Revised: 25 October 2019 / Accepted: 25 October 2019 / Published: 28 October 2019
(This article belongs to the Section Mineral Deposits)
The Xingdi No.2 intrusion in the Kuluktag Block of northeastern Tarim Craton, which intrudes into the Palaeoproterozoic basement with an exposed area of ca. 12 km2, is an orthopyroxene-rich mafic-ultramafic intrusion in a continental rift setting. It consists of gabbros, pyroxenites, and peridotites, and exhibits a crystallization sequence of the principal rock-forming minerals from olivine, orthopyroxene, clinopyroxene, to plagioclase. The gabbros show a concordant SHRIMP U-Pb zircon age of 752 ± 5.4 Ma. In addition, the olivine grains have forsterite content values of 78–85 mole% and mostly contain low NiO, MnO, CaO, and Cr2O3. The rocks are relatively enriched in large ion lithophile elements and LREE, and depleted in HSFE, have non-radiogenic Pb, low εNd (t) values (−2.8 to −23), initial 87Sr/86Sr ratios (0.7059–0.7130). It could be concluded that the rocks represent an analogue of siliceous high magnesium basaltic magma originated by the partial melting of a hydrous and enriched subcontinental lithospheric mantle and contaminated by the continental crust. View Full-Text
Keywords: siliceous high-magnesium basaltic magmas; continental rift; enriched subcontinental lithospheric mantle; Xingdi No.2 mafic-ultramfic intrusion; Kuluktag Block; Tarim Craton siliceous high-magnesium basaltic magmas; continental rift; enriched subcontinental lithospheric mantle; Xingdi No.2 mafic-ultramfic intrusion; Kuluktag Block; Tarim Craton
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Xia, Z.; Xia, M.; Ru, Y. The Role of Siliceous High-Magnesium Basalts during the Formation of a Neoproterozoic Mafic-Ultramafic Intrusion in the Tarim Craton (China). Minerals 2019, 9, 662.

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