The Carbon Cycle and Climate

Killops, S. D.; Killops, Vanessa

doi:10.1002/9781118697214.ch6

Cited by 3 publications

(3 citation statements)

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“…This excludes QC-46, sample S10, and QC-56, sample S1, where HE constituted 60% and 100%, respectively, and the OM in both samples appeared darker and more humic than in the other samples. Humic OM is a major indicator of the vitrinite group …”

Section: Resultsmentioning

confidence: 99%

“…The liptinite was intensely fluorescent AOM yellow and reddish in colors, compared to the vitrinite materials, which were black and nonfluorescent or weakly fluorescent and dull brown AOM. The inertinite was a modified vitrinite, in which the morphologically friable structure had been retained, and it was fluorescent dull brown or black …”

Section: Resultsmentioning

confidence: 99%

“…The inertinite was a modified vitrinite, in which the morphologically friable structure had been retained, and it was fluorescent dull brown or black. 45 …”

Section: Resultsmentioning

confidence: 99%

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Impact of Thermal Maturation of the Upper Cretaceous Bituminous Limestone of Attarat Um Ghudran Central Jordan on Calcareous Nannofossil Preservation

Alqudah,

Al Alaween,

Fermor

et al. 2023

ACS Omega

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Oil shale deposits of the Late Cretaceous from three boreholes in central Jordan were examined to assess the impact of thermal maturation on the content of nannofossils. Thermal activity has been shown to have a strong effect on organic matter content and composition but its effect on calcareous nannofossil assemblages remains inconclusive. This study aims to determine the impact of thermal maturation on nannofossil assemblages and to compare this to an estimated maturity level based on bulk geochemical analysis. Micropaleontological and geochemical analyses were conducted on 31 samples from three oil shale wells drilled in Attarat Um Ghudran central Jordan. Several types of nannofossil preservation have been recorded, including dissolution, overgrowth, and breakage. In the Jordan oil shale sections, nannofossils exhibit a variety of preservation types, with intense dissolution in the middle part of the study sections. The vast majority of the samples had high TOC enrichment, with 29 samples exceeding values of >10%. Kerogen recovery and quality from the oil shale are very good, with a predominance of fluorescent amorphous organic matter (AOM) and minor algal components. The low fluorescence preservation index (FPI), which is 1 in most of the samples, indicates that alteration occurred due to intense thermal activities in the study interval. The palynomorph and AOM fluorescence, ranging from a spore coloration index (SCI) of 3 to 5, suggest that the studied samples were approaching the oil window. A correlation between the nannofossil preservation and geochemical parameters shows a predominance of poorly preserved nannofossils along with high total organic carbon contents and an elevated hydrogen index (HI). We show that low FPI values and a higher level of maturity are associated with poor nannofossil preservation, suggesting that nannofossils, in conjunction with petrographic analysis of kerogen, could be used as a rapid screening technique for estimating levels of oil-shale maturity. The nature of the tectonism in the study area, including faulting and a metamorphosed zone, enhanced the maturity, which might explain why the nannofossils were so significantly affected.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Impact of Thermal Maturation of the Upper Cretaceous Bituminous Limestone of Attarat Um Ghudran Central Jordan on Calcareous Nannofossil Preservation

Alqudah,

Al Alaween,

Fermor

et al. 2023

ACS Omega

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Long-term annual water balance analysis of the Lena River

Berezovskaya

Yang

Hinzman

2005

Global and Planetary Change

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Historical data analyses show that the Lena River and its major tributaries experienced an extended low water period over 1936-1957 and high water periods over 1974-1983 and 1988-2001. Higher than normal river discharge and annual precipitation is particularly pronounced since the late 1960s due to large-scale changes in atmospheric circulation patterns. The trend in runoff observed in the Lena River basin increased by 10% from 1936 to 2001 due to extended wet periods during the second part of last century. The trend is weakened for the Vilui River basin since it experiences reservoir regulation, which causes additional water losses through reservoir filling and increased evaporation. Runoff regulation strongly affects the winter runoff regime of both the Vilui River and the lower reaches of the Lena River causing an increased winter discharge at the Lena river outlet station of approximately 33%. D

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