阿尔巴尼亚布尔其泽纯橄岩壳中橄榄石的包裹体研究

熊发挥; 杨经绥; 徐向珍; 郝晓琳

doi:10.3799/dqkx.2018.405

Volume 43 Issue 5

May 2018

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Article Navigation > Earth Science > 2018 > 43(5): 1464-1473

Xiong Fahui, Yang Jingsui, Xu Xiangzhen, Hao Xiaolin, 2018. Inclusions in Olivine and Implications-Based on Mineral Research of Dunite of Bulqiza Ophiolite, Albania. Earth Science, 43(5): 1464-1473. doi: 10.3799/dqkx.2018.405

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Xiong Fahui, Yang Jingsui, Xu Xiangzhen, Hao Xiaolin, 2018. Inclusions in Olivine and Implications-Based on Mineral Research of Dunite of Bulqiza Ophiolite, Albania. Earth Science, 43(5): 1464-1473. doi: 10.3799/dqkx.2018.405

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Inclusions in Olivine and Implications-Based on Mineral Research of Dunite of Bulqiza Ophiolite, Albania

doi: 10.3799/dqkx.2018.405

1.
Institute of Geology, Key Laboratory of Deep-Earth Dynamics of Ministry of Land and Resources, Chinese Academy of Geological Science, Beijing 100037, China
2.
Zhongdibaolian(Beijing) Land and Resources Exploration Technology Co. Ltd., Beijing 100193, China

Received Date: 2017-10-01
Publish Date: 2018-05-15

Abstract

Abstract

Cinopyroxene and spinel (magnetite) occur as oriented intergrowths within olivine of the dunite in the Bulqiza ophiolite, Albania. The size of the inclusion minerals is 1-10 μm, and some of them are nanoscale in 200-500 nm. The fresh dunite has a mineral assemblage of olivine, spinel and cinopyroxene. The Fo content of its olivine is 94.7-96.0, and the Cr^# of spinel is about 76.5-82.4, higher than that in the spinel in common dunite from ophiolite mantle (Cr^#>60). Thus it is proposed that previously depleted mantle harzburgite reacted with the melt containing Ti, Cr, Fe, and produced an olivine solid solution added with Ti⁴⁺, Al³⁺, Ca²⁺, Fe³⁺, and some of Cr³⁺ entered interstitial chromite. Due to the fast cooling rate of the rock or rapid tectonic emplacement, the exsolution textures in olivine and compositional zones of chromite are preserved. Based on the mineral compositions of chromian spinel-olivine, it is found that the relatively low partial melting degree of the harzburgite is 30%-40%, and the degree of partial melting of dunite is about 40%, indicating a significant difference of tectonic setting. It is suggested that the Bulqiza ophiolite had multi-stage evolution processes.When oceanic crustal slabs were trapped in mid ocean ridge, they were modified by tholeiitic magmas or partial melting, which occurred interaction or metasomatism, then later reaction with boninitic magma in suprasubduction zones (SSZ) generated more Mg, Si and Cr melt, resulting in high degree of partial melting for the mantle peridotite and dunite.
- dunite,
- inclusions,
- Bulqiza ophiolite,
- Albania,
- petrology

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References(35)

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