Homogeneous temperature of plagioclase melt inclusions in volcanic rocks from the Mariana Trough and its implication to magma evolution

ZHANG Baohui; ZENG Zhigang; ZENG Zhibin; YANG Xiaoshuang; WANG Xiaoyuan; QI Haiyan; YIN Xuebo; CHEN Shuai; CHEN Zuxing; HAN Chao

doi:10.16028/j.1009-2722.2024.038

2025 Vol. 41, No. 2

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Article navigation > Marine Geology Frontiers > 2025 > 41(2): 53-67

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ZHANG Baohui, ZENG Zhigang, ZENG Zhibin, YANG Xiaoshuang, WANG Xiaoyuan, QI Haiyan, YIN Xuebo, CHEN Shuai, CHEN Zuxing, HAN Chao. Homogeneous temperature of plagioclase melt inclusions in volcanic rocks from the Mariana Trough and its implication to magma evolution[J]. Marine Geology Frontiers, 2025, 41(2): 53-67. doi: 10.16028/j.1009-2722.2024.038

Citation:

ZHANG Baohui, ZENG Zhigang, ZENG Zhibin, YANG Xiaoshuang, WANG Xiaoyuan, QI Haiyan, YIN Xuebo, CHEN Shuai, CHEN Zuxing, HAN Chao. Homogeneous temperature of plagioclase melt inclusions in volcanic rocks from the Mariana Trough and its implication to magma evolution[J]. Marine Geology Frontiers, 2025, 41(2): 53-67. doi: 10.16028/j.1009-2722.2024.038

Homogeneous temperature of plagioclase melt inclusions in volcanic rocks from the Mariana Trough and its implication to magma evolution

1.
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2.
The Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
3.
College of Marine Sciences, University of Chinese Academy of Sciences, Qingdao 266400, China
4.
Henan Provincial Fifth Geological Exploration Institute, Zhengzhou 450001, China

More Information

Corresponding author: ZENG Zhigang, zgzeng@qdio.ac.cn

Received Date: 25 February 2024

Publish Date: 28 February 2025

Abstract

Abstract

The crystallization temperatures of plagioclase melt inclusions in volcanic rocks from the Mariana Trough was studied. Results show that those in andesite (H5-T3-2) from the southern Mariana Trough are mainly in 1 050~1 150 ℃ and did not affected by later magmatic evolution; those in basaltic andesite (H5-T1-3) from the central Mariana Trough are mainly 900~1 050 ℃; and those in dacite (H5-T1-1) are mainly 1 050~1 150 ℃. The homogenization temperatures of melt inclusions in basalt (H5-T2-2, H5-T2-3) plagioclase near 18°N in the Mariana Trough are mainly 1 050~1 150 ℃, showing a continuous cooling trend, and only a small part crystallizes at a lower temperature of 1 000~1 050 ℃, and the sudden drop in the An value at the edge of plagioclase phenocryst reflects a rapid cooling of the magma ejection. In addition, the homogenization temperature of the melt inclusions in basalt andesite (H5-T2-1) plagioclase showed the characteristics of "bimodal" pattern of 850~950 ℃ and 1 050~1 150 ℃. The banding characteristics and the An value variation of plagioclase indicate that the plagioclase experienced two distinct crystallization stages and magma mixing, and there might be a magma chamber in the shallow part of the Mariana Trough, where the magma chamber temperature is about 850~950 ℃. The magmatic evolution process near 18°N in the Mariana Trough is complex, and different periods of magmatic evolution may occur.
- Mariana Trough /
- plagioclase feldspar /
- melt inclusions /
- uniform temperature /
- magmatic evolution

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