Basalt from the Extinct Spreading Center in the West Philippine Basin: New Geochemical Results and Their Petrologic and Tectonic Implications
Abstract
:1. Introduction and Rationale of the Study
2. Geological Setting
3. Sampling and Geological Observations
3.1. Sampling Strategy
3.2. Petrography
4. Methods and Results
4.1. Analytical Methods
4.2. Results
4.2.1. Major and Trace Element Analysis
4.2.2. Sr–Nd–Hf Isotope Systematics
5. Discussion
5.1. Potential Effects of Post-Eruptive Alteration, Fractionation, and Assimilation
5.2. Source of Basalts from the WPB and Melting Conditions
5.3. Insights into the Origin of Basalts from the WPB
5.4. Geotectonic Setting of the WPB
6. Conclusions
- (1)
- Basalts from the WPB have trace element signatures typical of the BABB.
- (2)
- Their Sr–Nd–Hf isotopic characteristics are like those of Indian-type mafic rocks.
- (3)
- Geochemical modeling shows that they originated from ~20% melting of a N-MORB-like mantle source in the spinel peridotite stability field.
- (4)
- Depletions in Ti and Nd and low Hf/Sm ratios suggest that the mantle source of basalts from the study area incorporated a small amount of slab-derived sediment melt from the subducted PSP.
- (5)
- The compositional characteristics of basalts from the WPB indicate that their parental melts were formed at a BAB setting.
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Yin, Z.; Wang, W.; Chen, L.; Li, Z.; Liu, Q.; Xie, A. Basalt from the Extinct Spreading Center in the West Philippine Basin: New Geochemical Results and Their Petrologic and Tectonic Implications. Minerals 2021, 11, 1277. https://0-doi-org.brum.beds.ac.uk/10.3390/min11111277
Yin Z, Wang W, Chen L, Li Z, Liu Q, Xie A. Basalt from the Extinct Spreading Center in the West Philippine Basin: New Geochemical Results and Their Petrologic and Tectonic Implications. Minerals. 2021; 11(11):1277. https://0-doi-org.brum.beds.ac.uk/10.3390/min11111277
Chicago/Turabian StyleYin, Zhengxin, Weiping Wang, Liang Chen, Zhengyuan Li, Qiang Liu, and Anyuan Xie. 2021. "Basalt from the Extinct Spreading Center in the West Philippine Basin: New Geochemical Results and Their Petrologic and Tectonic Implications" Minerals 11, no. 11: 1277. https://0-doi-org.brum.beds.ac.uk/10.3390/min11111277