Implications for magmatic evolution of changes in plagioclase composition in the 26°S basalts, Southern Mid-Atlantic Ridge

Lei Qing; Wang Guozhi; Zhao Fufeng; Fan Lei; Liu Gang; Wang Ziang; Hu Qihua; Xiao Yuyu

doi:10.12284/hyxb2023152

Volume 45 Issue 11

Nov. 2023

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Lei Qing，Wang Guozhi，Zhao Fufeng, et al. Implications for magmatic evolution of changes in plagioclase composition in the 26°S basalts, Southern Mid-Atlantic Ridge[J]. Haiyang Xuebao，2023, 45(11)：62–75 doi: 10.12284/hyxb2023152

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Implications for magmatic evolution of changes in plagioclase composition in the 26°S basalts, Southern Mid-Atlantic Ridge

doi: 10.12284/hyxb2023152

Lei Qing^1
,,
Wang Guozhi^{2, 3
,
,},
Zhao Fufeng¹,
Fan Lei⁴,
Liu Gang¹,
Wang Ziang¹,
Hu Qihua¹,
Xiao Yuyu¹

1.
Faculty of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
2.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
3.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
4.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China

Received Date: 2023-04-11
Rev Recd Date: 2023-07-21

Available Online: 2023-10-23

Publish Date: 2023-11-30

Abstract

Abstract

The composition and texture characteristics of plagioclase in basalt from the 26°S hydrothermal field of the Southern Mid-Atlantic Ridge provide an important basis for the study of magmatic evolution characteristics. On the basis of observing the petrography of basalt and analyzing the composition of plagioclase, the structure and composition of plagioclase at different stages are compared to explore the process of magma evolution. The results show that the study area is mainly composed of porphyritic basalt, and plagioclase porphyries are commonly characterized by glomerocryst structures, oscillatory-zoned, dissolved and resorbed rim, and growth structures. The plagioclase in the matrix is mainly acicular and swallow-tailed crystals; the basalts in the SMAR-26°S hydrothermal zone are mainly sodium tholeiitic basalts. In the early stage of magma evolution, bytownite was mainly formed, while in the late stage, labradorite was mainly formed. Throughout the entire evolution process, the content of CaO and Al₂O₃ decreases, while the content of SiO₂, Na₂O, FeO, and MgO increases; from the core to rim of plagioclase phenocrysts and then to plagioclase microcrystalline in the matrix, the An values decreases overall. The An values in the rim of plagioclase phenocryst partially overlaps with the An values of plagioclase microlites in the matrix, resulting in a gradual decrease in temperature. These represent the changes from the magma origin area to magma eruption. After the formation of mantle magma, it rapidly rises and erupts to form basalt. During the upwelling process, it may undergo the process of decompression accompanied by volatiles escaping, dissolving in the deep, supersaturated crystallizing of the melt, mixing of low-Si same sourced magma, and syn-eruptive fast decompression of degassed magma.
- Southern Mid-Atlantic ridge,
- basalt,
- plagioclase phenocrysts,
- plagioclase microlites,
- magmatic evolution

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