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A New palynological Assemblage from the Nenjiang Formation of Dayangshu Basin, and its Geological Implication

Acta Geologica Sinica(English Edition) 2020年第1期94卷 198-199页

作者： SUN Lei WANG Chenglong BIAN Xiongfei Shenyang Center of Geological Survey China Geological SurveyShenyang 110034LiaoningChina School of Earth Sciences Northeast Petroleum UniversityDaqing 163318HeilongjiangChina

Objective The Dayangshu Basin located in eastern Inner Mongolia,is one of the key areas for oil and gas exploration in the periphery of Songliao *** far,this basin has been poorly explored,and the basic geological research is still weak,due to the lack of high-quality paleontologic and stratigraphic *** previous oil and gas investigations were mainly focused on the Early Cretaceous ***,the Late Cretaceous Nenjiang Formation in the basin also has hydrocarbon potential according to the latest *** recent oil and gas geological survey,palynological fossils have been discovered from the Nenjiang Formation in the Dayangshu Basin,providing new evidence for biostratigraphic division and correlation.

关键词： and its Geological Implication A New palynological Assemblage from the Nenjiang Formation of Dayangshu Basin

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palynological and Physicochemical Characterization of Honey in the Sudano-Guinean Zone of Cameroon

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Food and Nutrition Sciences 2015年第15期6卷 1339-1350页

作者： Dongock Nguemo Delphine Tchoumboue Joseph Laboratory of Biodiversity and Sustainability Development Department of Biological Sciences University of Ngaoundere Ngaoundere Cameroon Laboratory of Animal Physiology Department of Animal Production University of Dschang Dschang Cameroon

The palynological and physico-chemical characterization of honey was investigated in the Sudano- Guinean zone of Cameroon through the melissopalynology analysis. Results showed that honey with the dark amber color was the most represented. Sweet honey with less odour considered as pleasant highly predominate. The pH of honey is low and varies from 3.95 to 5.00;this ranking confirms the hypothesis that honey is from plant through visit of honeybees. The sugar content is very high ranging from 77.93% to 83.13%;the mean value is 78.90% and this value confirms that the honey is floral honey. The density value ranges from 1.39 to 1.43 and does not exceed the average standard (1.39 to 1.44 at 20℃). Water contents correspond to the standards norms. For free acidity, the highest value is 48.68 ± 0.28. There is a low positive correlation (r = 0.2) between free acidity and the pH of honey. Pollen analysis of honeys led to the identification of 41 pollen species belonging to 25 families. The highly represented families are Asteraceae and Myrtaceae. Two thirds of honey is monofloral and characteristics of three dominant species: Nymphaea maculata, Terminalia avicennioides and Syzygium guineense. The pollens of Syzygium guineense are present in all honey samples analysed.

关键词： Honey Melissopalynology palynological Analysis Physicochemical Analysis Cameroon

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Palaeoclimatic Evidences from the Quaternary Coastal Deposits, Southwestern, Nigeria

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Open Journal of Geology 2018年第6期8卷 585-605页

作者： Olugbenga A. Boboye Adewale Akinmosin Department of Geology University of Ibadan Ibadan Nigeria Department of Geosciences University of Lagos Lagos Nigeria

The studies on some samples retrieved from the coastal sediment deposit have been carried out. The palynological and geochemical indices were evaluated with the view of determining their chronology, palaeoclimatic conditions that prevailed during the time of their emplacement and also to re-asses the palaeoenvironment of the Lagos coastal deposit in Dahomey Basin. The identification of diagnostic species age entails the palynological analysis while the geochemical analysis determines the provenance of these Quaternary sediments. The occurrences of Laevigatosporites sp., Zonocostites ramonae, Acrostichum aureum in abundance along with few long ranging forms suggest that the vegetation development was under a humid climate and that the sediments were deposited during cooler and wetter conditions. The presence and high abundance of Crassoretitriletes vanraadshooveni, Zonocostites ramonae, Canthiumidites sp., Sapotaceoidaepollenites sp. and Pachydermitesdiederixi palynomorphs indicate an age range of late Pliocene (Gelasian) to early Pleistocene (Calabrian) (2.588 - 1.806 Ma). This age range is known to correspond to the 3.7 - 3.8 depositional cycles of relative change of coastal On-lap. The geochemical appraisal showed that the ratios of organic carbon-nitrogen (C/N) indicate that the sediments were sourced from aquatic, protein-rich and cellulose-poor milieu. The wetter climatic period has enhanced algae productivity as a consequence of greater wash-in of soil nutrients, and these periods are recorded as increased rate of organic carbon mass accumulation. Conversely, the dominance of a mangrove habitat, Zonocostites ramonae suggests a mangrove swamp environment which was the most prevalent environment of the Lagos lagoon in the Pleistocene.

关键词： Quaternary palynological Lagoon Organic Matter Dahomey Pleistocene Environment

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