Geochemical evaluation of the Late Paleocene and Early Eocene shales in Siri Canyon, Danish-Norwegian Basin

Zhou, Lingli; Friis, Henrik; Poulsen, Mette Lise K.

doi:10.1016/j.marpetgeo.2014.12.014

Cited by 40 publications

(22 citation statements)

References 59 publications

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“…Additionally, the high field strength element Zr is mainly associated with the heavy mineral fraction of sediments, and generally considered as one of the most immobile phases among the trace elements during chemical weathering. Hence, the Zr/TiO 2 ratios are widely used as an indicator of provenance rock types [ Scheffler et al ., ; Zhou et al ., ]. The constant Zr/TiO 2 ratios around 0.02 are further suggestive of a relatively stable provenance rock during the studied period (Figure ).…”

Section: Discussionmentioning

confidence: 61%

Paleoweathering and paleoenvironmental change recorded in lacustrine sediments of the early to middle Eocene in Fushun Basin, Northeast China

Chen

Ding

Tang

et al. 2017

Geochem Geophys Geosyst

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Deciphering the long-term interaction among continental silicate weathering, global climate, and atmospheric CO 2 concentrations is helpful in understanding the mechanisms of the Cenozoic climate change and accessing the future climatic and environmental response to anthropogenic carbon emissions. The Eocene, which is characterized by the Early Eocene Climatic Optimum (EECO) and the following global cooling, represents an ideal test case. Here we generate geochemical data of the Eocene lacustrine sediments from the Fushun Basin, northeast China, to explore the regional climatic response to the global climate change. The chemical index of alteration (CIA) and plagioclase index of alteration (PIA) consistently show a gradual, long-term decrease, indicating a climatic transition from warm and humid to relatively cold and arid during the Eocene in the Fushun Basin. This climatic trend is broadly coincident with the global cooling and decreasing CO 2 concentration, implying that the regional climate is closely correlated with the global climate change over geological time scales. Additionally, the extreme silicate weathering and high lake productivity as reflected by relatively positive d 13 C values of lacustrine organic matter are associated with the EECO. This consistency may demonstrate that enhanced continental weathering and lake productivity had served as effective sinks to lower atmospheric CO 2 across the EECO. Collectively, our new geochemical data add supporting evidence for a long-term, close coupling among continental silicate weathering, climate, and global carbon cycle during the Eocene.

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Section: Discussionmentioning

confidence: 61%

Paleoweathering and paleoenvironmental change recorded in lacustrine sediments of the early to middle Eocene in Fushun Basin, Northeast China

Chen

Ding

Tang

et al. 2017

Geochem Geophys Geosyst

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“…of older sedimentary source rocks from the highland areas of the beach sands in the western coast of Ghana. During weathering, diagenesis, and transportation, Al 2 O 3 and TiO 2 are considered to be immobile (Spalletti et al, 2012;Absar and Sreenivas, 2015;Armstrong et al, 2015;Zhou et al, 2015) and their ratio is widely used in deciphering sediment source. Hayashi et al (1997) indicated that Al 2 O 3 /TiO 2 values between 3 and 8 imply Herron, 1988).…”

Section: Source Rock Characterizationmentioning

confidence: 99%

Geochemistry and petrography of beach sands along the western coast of Ghana: implications for provenance and tectonic settings

Abu¹,

Sunkari²

2020

Turkish J Earth Sci

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“…The chemical composition of siliciclastic rocks is also a primary clue to infer their provenance (Hofer et al, ; Mishra & Sen, ; Moradi et al, ; Nagarajan et al, ; Zhou et al, ). A wealth of methods, diagrams, and indices were suggested to infer the general provenance of source rocks (e.g., Alexander, Bailey, & Pickering, ; Condie, ; Gu, Liu, Zheng, Tang, & Qi, ; Hayashi, Fujisawa, Holland, & Ohmoto, ; Hiscott, ; McLennan et al, ; Roser & Korsch, ).…”

Section: Discussionmentioning

confidence: 99%

“…Shales are the most prevalent terrigenous sediments among siliciclastic rocks that largely maintain the geochemical signatures of the parent material due to their impermeability and fine‐grained nature (Garver & Scott, ). Consequently, a wealth of studies have been used to reconstruct and monitor provenance, weathering history, tectonic setting, and sedimentary recycling based on the chemical composition and various geochemical parameters (e.g., Ghosh & Sarkar, ; Hao et al, ; Hofer, Wagreich, & Neuhuber, ; Lee, ; Li et al, ; Mishra & Sen, ; Moradi, Sarı, & Akkaya, ; Nagarajan et al, ; Zhou, Friis, & Poulsen, ).…”

Section: Introductionmentioning

confidence: 99%

Geochemical fingerprinting of Maastrichtian oil shales from the Central Eastern Desert, Egypt: Implications for provenance, tectonic setting, and source area weathering

et al. 2017

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Upper Cretaceous oil shales accumulated in intracratonic sedimentary basins along the Central Eastern Desert. Comprehensive geochemical analyses have been applied on 3 Maastrichtian oil shale horizons from the Duwi and Dakhla formations (El‐Beida and El‐Nakheil mines). We provide significant clues for chemical weathering, sediment recycling, petrogenesis, and tectonic setting of oil shales' source material. The mineralogical composition of the studied oil shales is generally characterized by carbonates, phyllosilicates, quartz, fluorapatite, and sulphides. The geochemistry is characterized by high Ca, P, Ni, U, and Cr values compared to standard post‐Archean Australian shales (PAAS). Their chondrite‐normalized patterns are distinguished by LREE enrichment, HREE depletion, negative Eu anomaly, and typical shale‐like PAAS‐normalized REE patterns. Furthermore, the total REE content is positively correlated with Si, K, Na, Fe, Al, Ti, and Mn, indicating that the REE of the investigated oil shales originated from terrigenous sources. Diverse proxies (e.g., CIA, CPA, and PIA) and the A–CN–K ternary diagram suppose that the source rock succession of the oil shales experienced moderate to intensive chemical weathering. Various geochemical parameters suggest that the oil shales were predominately derived from intermediate, with a minor contribution from felsic, igneous source rocks without any remarkable recycling signals. The average values of (Gd/Yb)N (1.39), Eu/Eu* (0.76), Th/U (0.29), and discrimination diagrams reveal that the oil shales were derived from Neoproterozoic island arc parent rocks. The geochemical results for oil shale provenance are in accordance with the composition and the palaeotectonic history of the igneous rocks in the Central Eastern Desert of Egypt.

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Geochemical evaluation of the Late Paleocene and Early Eocene shales in Siri Canyon, Danish-Norwegian Basin

Cited by 40 publications

References 59 publications

Paleoweathering and paleoenvironmental change recorded in lacustrine sediments of the early to middle Eocene in Fushun Basin, Northeast China

Paleoweathering and paleoenvironmental change recorded in lacustrine sediments of the early to middle Eocene in Fushun Basin, Northeast China

Geochemistry and petrography of beach sands along the western coast of Ghana: implications for provenance and tectonic settings

Geochemical fingerprinting of Maastrichtian oil shales from the Central Eastern Desert, Egypt: Implications for provenance, tectonic setting, and source area weathering

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