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https://hdl.handle.net/2440/114654
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Type: | Journal article |
Title: | Origin of sanukitoid and hornblendite enclaves in the Dajitu pluton from the Yinshan Block, North China Craton: product of Neoarchaean ridge subduction? |
Author: | Ma, X. Fan, H. Santosh, M. Liu, X. Guo, J. |
Citation: | International Geology Review, 2014; 56(10):1197-1212 |
Publisher: | Taylor & Francis |
Issue Date: | 2014 |
ISSN: | 0020-6814 1938-2839 |
Statement of Responsibility: | Xudong Ma, Hong-Rui Fan, M. Santosh, Xuan Liu and Jing-Hui Guo |
Abstract: | A Neoarchaean sanukitoid pluton that was intruded into the base of the Guyang greenstone belt in the Yinshan Block of the North China Craton hosts a number of hornblendite enclaves. Geochemically, the pluton is characterized by high MgO, Mg#, Cr, Ni, large-ion lithophile element (LILE), and heavy rare earth element (HREE) contents and low TiO₂ and high-field strength element (HFSE) contents, and has relatively low Sr/Y ratios and negative Eu anomalies. Whole-rock Sr–Nd isotopic analyses indicate that it has εNd(t) values of +1.4 to +2.0. These geochemical and isotopic characteristic suggest that the sanukitoid was formed under a low-pressure and high-temperature environment by slab melting and assimilation of hornblendite enclaves. The hornblendite enclaves show high MgO, Mg#, Cr, and Ni contents, high and variable K₂O, LREE, and Th contents, enrichment in LILEs and LREEs, and depletion in HFSEs. They have high Y contents and relatively low Sr/Y values, strongly negative Eu anomalies, and whole-rock εNd(t) values of +1.0 to +1.9. The geochemical and isotopic characteristics indicate that these enclaves might have been derived from a mixed source of an enriched mantle, metasomatized by melts expelled from subducted sediments in a high-temperature, low-pressure environment. To explain these characteristics, a ridge subduction model is proposed for the formation of the sanukitoid and hornblendite in the Yinshan Block in the Neoarchaean. |
Keywords: | Geochemistry; Nd isotope; Neoarchaean sanukitoid; ridge subduction; North China Craton |
Rights: | © 2014 Taylor & Francis |
DOI: | 10.1080/00206814.2014.929055 |
Published version: | http://dx.doi.org/10.1080/00206814.2014.929055 |
Appears in Collections: | Aurora harvest 8 Geology & Geophysics publications |
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