Middle Jurassic climate oscillations from paleosol records of the Sichuan Basin, SW China

Li, Jun; Huang, Chunyan; Yang, Guanglei; Pan, Yuanyuan; Wen, Xingyue

doi:10.1016/j.jop.2022.01.003

Cited by 8 publications

(11 citation statements)

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“…The paleotemperature of Sha-1 Member ranges from 9.71 to 16.24 °C, with an average of 16.9 °C, and the value of Sha-2 Member is from 5.67 to 15.53 °C, with an average of 12.81 °C. These results are consistent with the paleotemperatures (7.9–17.4 °C) calculated by the PWI index and the SAL index based on paleosol outcrops . In summary, the paleoweathering indices and climatic indicators demonstrate that the studied samples of Shaximiao Formation experienced moderate chemical weathering and formed in semiarid to semihumid conditions.…”

Section: Discussionmentioning

confidence: 99%

“…These results are consistent with the paleotemperatures (7.9−17.4 °C) calculated by the PWI index and the SAL index based on paleosol outcrops. 16 In summary, the paleoweathering indices and climatic indicators demonstrate that the studied samples of Shaximiao Formation experienced moderate chemical weathering and formed in semiarid to semihumid conditions. Moreover, paleotemperature T, C-value, and CIA index all suggest that the Sha-1 Member is wetter and warmer than the Sha-2 Member and experiences stronger weathering.…”

Section: Paleoclimate and Paleo-weathering Conditionsmentioning

confidence: 93%

“…The assumption is confirmed by temperature calculated from the relationship between weathering index and LST during the Shaximiao Formation (ranging from 11.6 to 17.7 °C) and calculated from the salinization (SAL) index (ranging from 10 ± 4.4 °C to 13 ± 4.4 °C). 16 Middle Jurassic sedimentary sequences, which are dominated with red sediments deposited in similar paleoclimates and paleoenvironments, have been discovered in many sedimentary basins in the Northern Hemisphere including the Junggar Basin, Qaidam Basin, and Santanghu Basin. In the Junggar Basin, the sedimentary environment changes from deltaic to fluvial depositional systems with enhanced aridity.…”

Section: Paleosalinity In a Paleo-water Environmentmentioning

confidence: 99%

“…15 The analysis of the paleosol and carbonate nodule in the northeast of the basin shows that this period is in the semiarid to semihumid climate and the dry-humid and cool/warm temperate climates alternately. 16 These studies reveal the paleoclimate of each region of the basin but lack of comprehensive analysis combined with mudstone type, paleowater body, and oxidation conditions. In terms of the sedimentary environment, sedimentary indicators of the delta front, such as channel and mouth bars, have been found in cores in central Sichuan, while meandering river and floodplain deposits are dominant in outcrops in western and eastern Sichuan.…”

Section: Introductionmentioning

confidence: 99%

“…The characteristics of clay minerals in the southwestern margin of the basin indicate a semi-arid climate dominated by intermittent cold and drought when Shaximiao Formation was deposited . The analysis of the paleosol and carbonate nodule in the northeast of the basin shows that this period is in the semiarid to semihumid climate and the dry-humid and cool/warm temperate climates alternately . These studies reveal the paleoclimate of each region of the basin but lack of comprehensive analysis combined with mudstone type, paleo-water body, and oxidation conditions.…”

Section: Introductionmentioning

confidence: 99%

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Element Geochemical Characteristics and Geological Significance of Mudstones from the Middle Jurassic Shaximiao Formation in Sichuan Basin, Southwest China

Zhang

Zhou

et al. 2023

ACS Omega

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Thick sequences of terrestrial multicolored mudstones of the Middle Jurassic Shaximiao Formation in the Sichuan Basin, Southwest China, effectively recorded paleoclimate and paleoenvironment changes. The paleoenvironment of the Shaximiao Formation is reconstructed by using detailed sedimentological and elemental geochemical analysis of the multicolored mudstones. The provenance, paleoclimate, paleosalinity, and paleoredox conditions are distinguished by using the discriminant indicators of CIA, C-value, Sr/Cu, Rb/Sr, Th/U, V/Cr, and V/(V + Ni). The results show that all samples derive primarily from felsic igneous rocks and intermediate rocks rather than recycled sediments. The mudstone sequences were deposited under semiarid and semihumid regions with paleoclimate evolved to drier and cooler conditions from lower to upper Shaximiao Formation. Such a paleoclimate coincided with the records of several basins in the lower paleolatitudes of the Northern Hemisphere and were possibly affected by the Middle Jurassic global geological events such as wildfire, paleogeographic reorganizations, and seaway dynamics change. The paleowater body belongs to a typical terrestrial freshwater environment, although the paleosalinity increased significantly during arid periods. The multicolored mudstones were deposited in oxidation and weak-oxidation to weak-anoxic conditions. We also propose a detailed conceptual paleoenvironment model for Shaximiao Formation, with a large perennial lake surrounded by limited alluvial plain during a period of high lake level and small ephemeral lakes scattering extensive alluvial plain during a phase of low lake level.

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Section: Discussionmentioning

confidence: 99%

Section: Paleoclimate and Paleo-weathering Conditionsmentioning

confidence: 93%

Section: Paleosalinity In a Paleo-water Environmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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