Astronomically forced saline lake deposition and paleoclimatic response in the Huanggang Basin during the Paleogene, Eastern China

Song, Changyue; Lv, Dawei; Chang, Jie; Ejembi, John I.; Tang, Lulu; Raji, Munira; Chen, Wentao; Zhang, Zhihui

doi:10.1016/j.oregeorev.2023.105506

Cited by 4 publications

(3 citation statements)

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“…Additionally, certain sections of the white-colored, thick salt layers demonstrate relatively lower densities, suggesting a weakened compaction process during the dissolution and re-deposition phases. This phase roughly corresponds to the low amplitude of the ultralong eccentricity cycle, indicating a small seasonal variation [27], further supporting the proposed hypothesis.…”

Section: Depositional Modelssupporting

confidence: 78%

“…The basin is a terrestrial fault basin formed under the action of the Tantanlu strike-slip fracture system in eastern China, and a large rock salt deposit with a reserve of more than 20 billion tons was deposited during the Paleogene period. During the Eocene-Oligocene epoch, a continuous and widespread shallow and saline lacustrine succession, rich in halite, gypsum, and other salt minerals, developed in the Dawenkou Formation, Guanzhuang Group of the Huanggang Basin [22,27]. The Dawenkou Formation consists of three sections, with the lower section being primarily composed of brownish-red to purplish-red mudstone and argillaceous siltstone.…”

Section: Geological Settingsmentioning

confidence: 99%

“…The second model (LA2) explains the metallogenic model of thin rock salt. During the transitional phase from arid to semi-arid paleoclimates, the periodicity in climatic variations emerged as the major control, leading to the episodic deposition of thin rock salt layers that exhibit a strong correspondence with the minimum values of the short eccentricity cycles [27]. Within this specific layer, trace elements, including B/Ga, Sr/Ba, and V + Ni + Mn, have an overall modest concentration compared to LA1, while the major elements (Al 2 O 3 , K 2 O, TiO 2 , and P 2 O 5 ) have a slight increase in their concentrations.…”

Section: Depositional Modelsmentioning

confidence: 99%

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Sedimentary Characteristics and Depositional Model of the Paleogene Dawenkou Formation in Eastern China: Insights from the Huanggang Depression

Chen,

Lv,

Ejembi

et al. 2024

Minerals

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The Huanggang depression in eastern China is a significant Cenozoic salt-bearing basin that formed during the alternating dry and wet climate periods from the Eocene to the Oligocene. Despite the economic importance of the Huanggang depression, its saliferous model remains controversial. To address this issue, we conducted comprehensive analyses of the sedimentology and elemental geochemistry on the YZR1 borehole core, which hosts a relatively complete sedimentary record of the Huanggang depression, consisting of five lithofacies’ assemblages. The combined lithofacies and geochemical ratios, including B/Ga, Sr/Ba, and V/(V + Ni), provide insights into the paleolake’s evolution in the Huanggang depression. Our analyses indicated that the paleolake underwent a transition from a freshwater lake to a brackish water/saline lake, subsequently transforming into a salt lake, reverting back to a brackish water/saline lake, and ultimately returning to its original state as a freshwater lake. These changes are reflected in the sedimentary record and inform the six stages of evolution of the paleolake of the Dawenkou Formation. We propose two metallogenic models to explain the accumulation of the thick halite (LA1) and thin halite layers (LA2), respectively. LA1 is primarily dominated by halite deposition, forming in an extremely shallow water environment under arid climate conditions. In contrast, LA2 records the alternating deposition of halite, anhydrite, and mudstone, and formed in a shallow water environment under arid to semi-arid climatic conditions. LA1 has a much drier climate and higher salinity than LA2. Our results suggest that the salt-forming period in the Huanggang depression occurred from the late Eocene to the early Oligocene. The halite in the Huanggang depression formed in a shallow water environment, providing the basis for the halite deposition model of the depression. This study sheds light on the formation mechanism of halite in the Paleogene in eastern China.

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Section: Depositional Modelssupporting

confidence: 78%

Section: Geological Settingsmentioning

confidence: 99%

Section: Depositional Modelsmentioning

confidence: 99%

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