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Lithospheric strength of the Caroline Islands and its tectonic implications

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Abstract

The Caroline Islands are located in a broad zone near plate boundaries in southwestern Pacific. Accumulating evidence suggests that the hotspot origin alone cannot completely explain the formation of the Caroline Islands. To investigate the tectonic setting of their formation, we calculated the effective elastic thickness (Te) of the lithosphere beneath the Caroline Islands from an analysis of bathymetry and free-air gravity anomaly data by the admittance method. A synthetic model based on the actual bathymetry data of the Caroline Islands was developed for the finite window size biasing correction. The results show that the Te values of the Caroline Islands (4.5–11.5 km) are significantly lower than the Te expected for a normal oceanic lithosphere (23–50 km), and that the Te values can be approximated by the depth to the 150 ± 100°C isotherm. The low Te values indicate that the strength of the lithosphere beneath the Caroline Islands has been weakened by geological process. The thermal anomalies related to the Ontong Java Plateau and the South Pacific Isotopic and Thermal Anomaly, and the lithospheric fractures induced by interaction of plates are probable causes of the lithospheric strength reduction of the Caroline Islands.

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Acknowledgments

This research is funded by the National Natural Science Foundation of China (Grant No. 41541027). Special thanks to Dr. Jiansheng Wu and Yonghui Zhao at Tongji University for their helpful suggestions. Some figures were drawn with the General Mapping Tools (Wessel and Smith, 2013).

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  1. School of Resources and Civil Engineering, Suzhou University, 234000, Anhui, China

    Mingming Wang

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Wang, M. Lithospheric strength of the Caroline Islands and its tectonic implications. Stud Geophys Geod 63, 520–537 (2019). https://doi.org/10.1007/s11200-019-0732-7

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