Mineralogical and Geochemical Constraints on the Mantle Source Characteristics of Basaltic Lavas from the Central Mariana Trough

被引：0
作者：
Zhiqing Lai
Wei Gao
Zongzhu Han
Kun Guo
Shihua Zhong
Guangtao Zhao
机构：
[1] Ocean University of China,Key Laboratory of Submarine Geosciences and Prospecting Techniques, MOE and College of Marine Geosciences
[2] Chinese Academy of Sciences,Key Laboratory of Marine Geology and Environment, Institute of Oceanology
[3] National Deep Sea Center,Center for Isotope Geochemistry and Geochronology
[4] Pilot National Laboratory for Marine Science and Technology (Qingdao),undefined
来源：
Journal of Ocean University of China | 2023年 / 22卷
关键词：
backarc basin basalt; subduction component; mantle lithology; magma generation;
D O I：
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中图分类号：
学科分类号：
摘要：
The composition of mantle-derived basalts reflects the nature of their mantle source regions, which constrain magma generation and composition. Here we present a new whole rock major and trace elements and phenocryst composition of the basaltic lava in the central Mariana Trough. These data provide insights into the mantle source characteristics affected by subduction components. The rocks range from basalts to basaltic andesites, which have high subduction-mobile element contents (e.g., K, U, Th, LREE) related to N-MORB. The calculated temperature and depth of magma generation are about 1300 °C and 30 km, respectively. Although the results above suggest that the addition of hydrous fluid and/or a melt derived from a slab decreases the temperature of mantle partial melting and mildly modifies the composition of a mantle source, the mantle source lithology from which primary magma is generated remains to be peridotite.
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页码：1313 / 1325
页数：12
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