Version 1
: Received: 14 November 2023 / Approved: 15 November 2023 / Online: 15 November 2023 (16:34:31 CET)
How to cite:
Lee, Y.; Lin, M. Geochemistry of Cenozoic Basaltic Rocks from Anhui Province, China: Implications for Their Petrogenesis and Mantle Processes. Preprints2023, 2023110972. https://doi.org/10.20944/preprints202311.0972.v1
Lee, Y.; Lin, M. Geochemistry of Cenozoic Basaltic Rocks from Anhui Province, China: Implications for Their Petrogenesis and Mantle Processes. Preprints 2023, 2023110972. https://doi.org/10.20944/preprints202311.0972.v1
Lee, Y.; Lin, M. Geochemistry of Cenozoic Basaltic Rocks from Anhui Province, China: Implications for Their Petrogenesis and Mantle Processes. Preprints2023, 2023110972. https://doi.org/10.20944/preprints202311.0972.v1
APA Style
Lee, Y., & Lin, M. (2023). Geochemistry of Cenozoic Basaltic Rocks from Anhui Province, China: Implications for Their Petrogenesis and Mantle Processes. Preprints. https://doi.org/10.20944/preprints202311.0972.v1
Chicago/Turabian Style
Lee, Y. and Meng-Lung Lin. 2023 "Geochemistry of Cenozoic Basaltic Rocks from Anhui Province, China: Implications for Their Petrogenesis and Mantle Processes" Preprints. https://doi.org/10.20944/preprints202311.0972.v1
Abstract
Based on the major, trace element, and isotope data of the Cenozoic basalts in the study area, it is indicated that the basalts in this region can be classified into three distinct magma systems: alka-li basalts, tholeiite basalts, and Nushan alkali basalts. The geochemical characteristics observed in the studied basalts indicate that the mantle source in this region might have experienced met-asomatic processes prior to partial melting, which could be linked to an ancient subduction pro-cess. Combining the geochemical characteristics in the studied basalts with previous research, we propose that the underlying mantle source in Anhui province may have undergone metaso-matism due to the carbonatitic melts. These melts are believed to have originated from car-bonated eclogite, derived from subducted Pacific slab materials present in the deeper mantle. According to the Sr-Nd isotope data, it is suggested that the mantle source in the Nushan region could be derived from a depleted asthenospheric mantle, while the basaltic composition in the Niugang area may be representative of the mantle's end components associated with the EM-I enriched mantle source present in this study area. Therefore, we propose that the Anhui basalts may have originated from the partial melting of a mantle source representing a mixing of two end-members: DMM (Depleted MORB Mantle) and EM-Ⅰ (Enriched Mantle 1). The Anhui basal-tic magmas may have originated from the partial melting of EM-Ⅰ, potentially influenced by upwelling asthenospheric mantle or asthenospheric diapirism processes. The mantle source in the study area experiences partial melting at 1-5%, 15%, and 1-10%, resulting in the formation of parent magmas for alkali basalt, tholeiitic basalt, and Nushan alkali basalt. Subsequently, the parent magmas experienced fractional crystallization processes, which included minerals like olivine, pyroxene, and plagioclase. This led to the formation of various types of basalt in the study area.
Environmental and Earth Sciences, Geochemistry and Petrology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
