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Geochemistry of the Lower Cretaceous limestones in the Eastern Tethys Gyabula Formation (Himalaya, southern Tibet): implications for the depositional environment and tectonic setting

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Abstract

The Tibetan Himalaya region provides crucial sedimentary successions for studying the evolution of the eastern Tethyan depositional area. However, the palaeo-environmental conditions during the Early Cretaceous period in southern Tibet (Tethys Himalaya northern zone) are not well constrained. In this paper, we report on the major, trace, and rare earth elements, as well as the carbon and oxygen isotopic compositions of the limestone successions in the Lower Cretaceous Gyabula Formation of the Rongpo area. The obtained sedimentary rare earth element (REE) profiles suggest that the Rongpo area was situated on a passive continental margin during the Early Cretaceous. The integrated geochemical and sedimentological analyses and results suggest that the limestones were deposited in a non-open marine depositional environment, marked by anoxic conditions. The strong positive europium (Eu) anomalies (Eu/Eu* = 1.77 ± 0.07), high SiO2 contents (average 19.30 ± 2.82%), and the negative δ13C values and δ18O values suggest that hydrothermal fluids may have impacted the Early Cretaceous Neo-Tethyan seawater geochemistry. The combined sedimentological and geochemical data provide new insights on the palaeo-environmental and tectonic setting of the Lower Cretaceous Neo-Tethyan successions of southern Tibet.

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Acknowledgements

We are grateful to the experts at the Chengdu Center of the China Geological Survey for their support and Rongpo Team members for their field assistance during the field survey. We also acknowledge the two anonymous reviewers and editors for their constructive feedback and suggestions.

Funding

This study was funded by the Central Finance Ministry of China (grant number DD20160015-06, the project of 1:50000 scale regional geological survey of the China Geological Survey) and co-funded by the National Natural Science Foundation of China (Nos. 41790454, 41688103).

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Correspondence to Feng Ding or Yongdong Wang.

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The authors declare no competing interests.

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Responsible Editor: Attila Ciner

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Li, Q., Ding, F., Ruhl, M. et al. Geochemistry of the Lower Cretaceous limestones in the Eastern Tethys Gyabula Formation (Himalaya, southern Tibet): implications for the depositional environment and tectonic setting. Arab J Geosci 14, 2353 (2021). https://doi.org/10.1007/s12517-021-08627-6

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  • DOI: https://doi.org/10.1007/s12517-021-08627-6

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