Revealing paleosalinity and paleoclimatic characteristics in Dawenkou Formation of the Paleogene in Huanggang Depression, eastern China: An integrated geochemical and palynological analysis

IF 3.6 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Wentao Chen , Dawei Lv , Zhenguo Ning , Hao Xin , Cuiyu Song , Munira Raji , Fanwei Meng , Bin Yang , Zhihui Zhang , Lulu Tang
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Abstract

The variations in paleosalinity and paleoclimate significantly influence the deposition and distribution of rock salt deposits. Understanding these variations is therefore essential for advancing knowledge of salt resource formation and supporting exploration efforts. In this study, we use an integrated approach combining geochemical and palynological proxies to reconstruct paleosalinity and paleoclimate during the salinization period of the Paleogene Dawenkou Formation, based on core samples from the ZK04 borehole in the Huanggang Depression, eastern China. The analysis identifies three distinct salinity phases spanning the late Eocene to early Oligocene: hyposaline water to mesosaline conditions, mesosaline to hypersaline conditions, and a return to hyposaline conditions. The intermediate hypersaline phase is particularly notable for a significant increase in both salinity and aridity, as evidenced by salinity-sensitive proxies such as the B/Ga ratio, boron excess (Bxs), corrected Sr/Ba, and sulfur-to-total organic carbon (S/TOC) ratios. Among these, the B/Ga ratio emerges as the most reliable indicator for reconstructing paleosalinity. The findings highlight the primary role of arid climatic conditions and elevated salinity in driving rock salt deposition in the Dawenkou Formation and offer valuable insights into the environmental controls on salt formation in other comparable basins worldwide.

Abstract Image

黄冈坳陷古近系大门口组古盐度与古气候特征:地球化学与孢粉学综合分析
古盐度和古气候的变化对岩盐沉积和分布有重要影响。因此,了解这些变化对于提高对盐资源形成的认识和支持勘探工作至关重要。本文以黄冈坳陷ZK04钻孔为研究对象,采用地球化学和孢粉相结合的方法,重建了古近系大门口组盐渍化时期的古盐度和古气候。分析确定了始新世晚期到渐新世早期的三个不同的盐度阶段:低盐水到中盐条件,中盐到高盐条件,以及回到低盐条件。盐度和干燥度的显著增加尤其值得注意,这一点可以通过盐度敏感指标如B/Ga比、硼过量(Bxs)、校正后的Sr/Ba和硫与总有机碳(S/TOC)比来证明。其中,B/Ga比值是重建古盐度最可靠的指标。这一发现强调了干旱气候条件和盐度升高对大汶口组岩盐沉积的主导作用,并为世界上其他类似盆地的环境控制盐的形成提供了有价值的见解。
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来源期刊
Chemical Geology
Chemical Geology 地学-地球化学与地球物理
CiteScore
7.20
自引率
10.30%
发文量
374
审稿时长
3.6 months
期刊介绍: Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.
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