Mineral chemistry and geological significance of plagioclases hosted by basalts from the Cocos Ridge

Ge Zhenmin; Yan Quanshu; Zhao Renjie; Shi Meijuan

doi:10.3969/j.issn.0253-4193.2020.07.008

Volume 42 Issue 7

Nov. 2020

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Ge Zhenmin，Yan Quanshu，Zhao Renjie, et al. Mineral chemistry and geological significance of plagioclases hosted by basalts from the Cocos Ridge[J]. Haiyang Xuebao，2020, 42(7)：93–107 doi: 10.3969/j.issn.0253-4193.2020.07.008

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Mineral chemistry and geological significance of plagioclases hosted by basalts from the Cocos Ridge

doi: 10.3969/j.issn.0253-4193.2020.07.008

Ge Zhenmin^1
,,
Yan Quanshu^{1, 2, 3
,
,},
Zhao Renjie^{1, 3},
Shi Meijuan¹

1.
Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China
3.
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Received Date: 2019-07-25
Rev Recd Date: 2019-10-14

Available Online: 2020-11-18

Publish Date: 2020-07-25

Abstract

Abstract

During the Integrated Ocean Drilling Program (IODP) Expeditions 334 and 344, tholeiitic basalt basement samples of the Cocos Ridge offshore central America were drilled in holes U1381A and U1381C at Site U1381. Studying on these samples will provide some important clues for understanding their petrogenesis. In this study we carried out in-situ major and trace elements analysis for plagioclase phenocrysts and microlites hosted by these basalt samples. The results show that plagioclases are bytownite, labradorite, with a small number of andesine. Some of the plagioclase phenocrysts show positive compositional zoning, while others only have weak compositional changes from the core to the rim of the phenocrysts. The trace element compositions of plagioclase phenocrysts and microlites are quite different. The plagioclase phenocrysts are enriched in light rare earth elements and large ion lithophile elements, depleted in high field strength elements, and have obvious positive Eu anomalies. The contents of most incompatible elements of microlites are higher than those of phenocrysts. We used the classical igneous plagioclase thermometer to calculate the crystallization temperature of plagioclase phenocrysts and microlites as follows, i.e., 1 050−1 253℃ for plagioclase phenocrysts, and 866−1 033℃ for plagioclase microlites. Finally, we suggest that the core of plagioclase phenocrysts is crystallized from earlier relatively primitive magma, while the rim of the phenocrysts and microlites are crystallization products of continuous evolved magma compositions. The corrosion structure and positive compositional zoning of plagioclase phenocrysts may be mainly caused by some processes such as upwelling decompression and magma recharging. We suggest that the Cocos Ridge basaltic magma was originated from a magma chamber with continuous injection and convection of primitive magma.
- basaltic rocks,
- plagioclase,
- mineral chemistry,
- trace element,
- Cocos Ridge,
- magmatism

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References(47)

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