Purple soil inheritance and source of parent rock material and tectonic background in the Sichuan Basin

Yizhou, P.; Grigorieva, I.Y.

Авторы: Yizhou Peng, Grigorieva Iya Yu
Журнал: Geology, Ecology, and Landscapes
Номер: 19 October
Год издания: 2023
Издательство: Taylor & Francis
Местоположение издательства: United Kingdom
DOI: 10.1080/24749508.2023.2265125
Аннотация: The parent rock inheritance of the purple soils in the Sichuan Basin is evident, and this is due tofactors that are directly related to the parent rocks’ characteristics. Fundamentally, the natureof purple soils is determined by the lithology, chemical composition, weathering, and soilformation of parent rocks, whereas the provenance, and tectonic context of rocks during theirdiagenesis have a significant influence on their rock attributes. In this study, rocks from foursedimentary layers of the Cretaceous and Jurassic eras – k1c, J3p, J3s, J2s in the Sichuan Basin –as well as the overlying soils were examined, and experimental determinations of the samples’physical characteristics and chemical elemental composition were made to confirm the parentrock inheritance of purple soils. The essential weathering indices ICV, CIAcorr, WIP, and Na/Kwere used to study the weathering characteristics of the rocks and soils, and the A-CN-K ternarydiagram was used to assess the weathering trends of the rocks. The findings demonstrate thatpurple soil exhibits significant parent rock inheritance due to its rapid physical soil formationprocess and weak chemical weathering process. That the rocks of the four sedimentary layers inthe study area have all reached a moderate degree of weathering, their original sourcecomponents are quartzose sedimentary which may have been derived from feldspar sourcerocks. The tectonic background of the source rocks may be mainly continental arc and activecontinental margin environment, there may be an oceanic arc tectonic environment.
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