Paleoenvironmental reconstruction preceding and during the early Aptian Oceanic Anoxic Event 1a in southern Tibet, eastern Tethys

Nie, Ying; Fu, Xiugen; Wei, Hengye; Lin, Fei; Zeng, Shengqiang; Mansour, Ahmed; Zhou, Gang; Wang, Wenzhi

doi:10.1016/j.cretres.2023.105604

Cited by 11 publications

(4 citation statements)

References 117 publications

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“…Overall, the climate of the Gongjue Formation in the Qamdo Basin changes frequently from a warm-humid climate to a dry-hot climate, and similarly, the salinity of the water column changes from brackish water to seawater, particularly in Eg 2 where the salinity of the climate and water column salinity changes more frequently. This change in climate and water column salinity may be related to the Paleocene–Eocene maximum heat event, which resulted in a global temperature increase of 5–10 °C and atmospheric humidity. , Thus, changes in climate during the Paleocene Gongjue period in the Qamdo Basin of the Tibetan Plateau are a response to global Paleocene–Eocene climate change.…”

Section: Discussionmentioning

confidence: 99%

“…This change in climate and water column salinity may be related to the Paleocene–Eocene maximum heat event, which resulted in a global temperature increase of 5–10 °C and atmospheric humidity. 108 , 109 Thus, changes in climate during the Paleocene Gongjue period in the Qamdo Basin of the Tibetan Plateau are a response to global Paleocene–Eocene climate change.…”

Section: Discussionmentioning

confidence: 99%

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Response of Paleogene Fine-Grained Clastic Rock Deposits in the South Qiangtang Basin to Environments and Thermal Events on the Qinghai-Tibet Plateau

Zhang

Zheng³

et al. 2023

ACS Omega

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The Chamdo Basin is a secondary basin in the eastern part of Tibet China and is one of the most promising of petroliferous basins for new petroleum exploration. The Qamdo Basin records a complex burial history from the Mesozoic to the Cenozoic; however, the poorly constrained sedimentology of Cenozoic strata in this basin has severely obscured the overall profile and impeded further explorations of oil and gas resources. Here, we conduct whole-rock geochemical analyses of major, trace, and rare earth elements in fine-grained clastic rocks of the Paleocene Gongjue Formation, Qamdo Basin to reveal depositional environments, provenance, and tectonic setting. Petrologically, the Gongjue Formation is dominated by red fine-grained sandy mudstones/siltstones with ripple marks. The high values of the chemical index of alteration (avg. of 78.93), chemical index of weathering (avg. of 90.10), and index of compositional variability (avg. of 2.5) suggest that the basin has undergone heavy weathering. Cross-plots of La vs Th, Th vs Sc vs Zr/10, and Th vs Co vs Zr/10 reveal a continental arc tectonic setting. Paleosalinity (Sr/Ba), paleoclimate (Sr/Cu), and redox proxies (V/Cr, U/Th, and enrichment factors of Mo and U) indicate brackish to saline and oxidizing paleowater masses during deposition of the Gongjue Formation. Provenance analyses via elements and petrology reveal that sediments in the Gongjue Formation are mainly derived from intermediate–acidic rocks of the upper crust. We conclude that the first and third members are more arid climate and heavily chemically weathered than the second member. In combination with previous studies of the structural evolution of the Qamdo Basin since the Paleogene, a model is built to describe the sedimentary environment and evolution of the Qamdo Basin during transition to the Paleocene. The first and third members, i.e., the Eg1 and Eg3 members of the Gongjue Formation, are dominated by an oxidizing environment of seawater-saltwater, and the climate ranges from warm and humid to arid and hot, with relatively stable environmental changes. The Eg2 member of the Gongjue Formation is dominated by an oxidizing environment of seawater-saltwater, and the climate ranges from warm and humid to arid and hot, with more frequent environmental evolution. Our model aids in better understanding of the Paleocene climate evolution of the eastern Tibetan Plateau.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Response of Paleogene Fine-Grained Clastic Rock Deposits in the South Qiangtang Basin to Environments and Thermal Events on the Qinghai-Tibet Plateau

Zhang

Zheng³

et al. 2023

ACS Omega

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“…6), and relatively high productivity was maintained by phosphorus recycling. Oscillations in TOC, RSTE, and PSTE suggest periodic changes between oxic and suboxic conditions, where the water column ventilation may have moderated TOC by organic matter destruction (cf., Nie et al, 2023). Overall, the unrelenting global productivity led to CO2 drawdown, more oxic conditions, and a post-OAE 1a climate overturn towards less humid conditions (Westermann et al, 2013).…”

Section: Causes Of Variations In Intrashelf Basin Bottom Water Condit...mentioning

confidence: 99%

“…The OAE 1a represents a major episode of climatic, biotic, environmental, and climatic perturbations related to a global warming event, increased marine productivity, oxygen-depleted bottom water, and increased burial of organic matter in deep-water settings (e.g., Schlanger and Jenkyns, 1976;Weissert and Bréheret, 1991;Jenkyns, 2010;Erba et al, 2015;Castro et al, 2021;Percival et al, 2021). However, its record is characterized by spatial variability in redox conditions likely related to paleogeography, freshwater input, and depth, with deeper parts of the Tethys characterized by anoxic-euxinic conditions and less reducing conditions in shallower environments (Westermann et al, 2013;Nie et al, 2023). The OAE 1a onset was characterized by a massive input of isotopically light carbon into the ocean, as evidenced by a major negative δ 13 C excursion (Schlanger and Jenkyns, 1976;Arthur et al, 1990) in segment C3 sensu Menegatti et al (1998).…”

Section: Causes Of Variations In Intrashelf Basin Bottom Water Condit...mentioning

confidence: 99%

Intrashelf Basin Record of Redox and Productivity Changes Along the Arabian Margin of Neo-Tethys During Oceanic Anoxic Event 1a

Jafarian,

Husinec,

Wang

et al. 2023

Preprint

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Multi‐Parameter Investigation of Cretaceous to Palaeocene Sedimentary Sequences in the Anambra and Niger Delta Basins, Nigeria: Organic Matter Characterisation, Palynofacies and Implications for Palaeoclimate and Sea‐Level Changes

Omietimi,

Lenhardt,

Yang

et al. 2024

Geological Journal

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The Anambra Basin of Nigeria, part of the larger West and Central African Rift System (WCARS) across Africa, contains primarily Cretaceous to Palaeocene shallow to marginal marine and freshwater sedimentary deposits. The organic‐rich deposits of the Cretaceous Nkporo and Mamu formations within the Anambra Basin and the Palaeocene Imo Formation of the Niger Delta Basin constitute important conventional source rocks. Despite its economic significance, research on organic matter characterisation, palynofacies, sea‐level fluctuations, palaeoclimate, hydrogeography, basin restriction, palaeobathymetry and the factors controlling organic matter preservation remains largely undocumented. The here presented new inorganic and organic geochemical and organic petrography data of the Cretaceous to Palaeocene deposits serve to refine the regional interpretation at a basinal scale and within the supra‐regional context of the WCARS. Geochemical palaeotemperature proxies suggest a warm and humid tropical palaeoclimate during the Late Cretaceous within the study area. Furthermore, the measured TOC values indicate poor to very good organic content. Palynofacies analysis revealed high abundances of opaque and translucent phytoclasts and low amounts of palynomorphs with negligible amorphous organic matter (AOM) in the studied mudrocks. Two palynofacies groups suggest shallow‐marine conditions in a proximal shelf setting and a heterolithic oxic basin. The palynofacies of the upper Imo Formation reveal higher percentages of dinoflagellate cysts during the early highstand phase, with equidimensional, opaque phytoclasts representing the maximum flooding phase, accompanied by warmer conditions. Additionally, abundant terrestrial phytoclasts, Deltoidospora spp., Classopollis spp. and geochemical indicators collectively indicate warm tropical climatic conditions consistent with geochemical interpretations. The palaeobathymetry reconstructions suggest a shallow seaway during the Upper Cretaceous in the Anambra Basin.

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Paleoenvironmental reconstruction preceding and during the early Aptian Oceanic Anoxic Event 1a in southern Tibet, eastern Tethys

Cited by 11 publications

References 117 publications

Response of Paleogene Fine-Grained Clastic Rock Deposits in the South Qiangtang Basin to Environments and Thermal Events on the Qinghai-Tibet Plateau

Response of Paleogene Fine-Grained Clastic Rock Deposits in the South Qiangtang Basin to Environments and Thermal Events on the Qinghai-Tibet Plateau

Intrashelf Basin Record of Redox and Productivity Changes Along the Arabian Margin of Neo-Tethys During Oceanic Anoxic Event 1a

Multi‐Parameter Investigation of Cretaceous to Palaeocene Sedimentary Sequences in the Anambra and Niger Delta Basins, Nigeria: Organic Matter Characterisation, Palynofacies and Implications for Palaeoclimate and Sea‐Level Changes

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