Scanning electron microscope and light microscope investigations of pollen from an atypical mid-Eocene coal facies in Stolzenbach mine (PreußenElektra) near Borken (Kassel, Lower Hesse, Germany)

Hofmann, Christa-Ch.; Gregor, Hans-Joachim

doi:10.1016/j.revpalbo.2018.02.004

Cited by 17 publications

(9 citation statements)

References 65 publications

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“…10 , 11 Scanning electron microscopy (SEM) is a method of transmission and optical microscopic observation. 12 − 15 By scanning the synaptic points on the surface of the measured object by electron beam, the microscopic morphology image of the material is generated according to the surface fluctuation. In contrast, Pan et al’s method is based on the capillary condensation phenomenon, 16 − 18 i.e., nitrogen begins to condense in micropores, and the pore volume and diameter distributions are analyzed.…”

Section: Introductionmentioning

confidence: 99%

“…At present, the research methods of coal pores mainly include scanning electron microscopy, high-pressure mercury injection, and low-temperature nitrogen adsorption. , Mercury injection is based on the characteristics of the mercury injection curve and mercury injection pressure, which can effectively reflect the characteristics of coal pores. , Scanning electron microscopy (SEM) is a method of transmission and optical microscopic observation. − By scanning the synaptic points on the surface of the measured object by electron beam, the microscopic morphology image of the material is generated according to the surface fluctuation. In contrast, Pan et al’s method is based on the capillary condensation phenomenon, − i.e., nitrogen begins to condense in micropores, and the pore volume and diameter distributions are analyzed.…”

Section: Introductionmentioning

confidence: 99%

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Pore Characteristics and Fractal Dimension Analysis of Tectonic Coal and Primary-Structure Coal: A Case Study of Sanjia Coal Mine in Northern Guizhou

et al. 2022

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Understanding the pore heterogeneity of tectonic coal and primary-structure coal is of great significance for predicting and preventing tectonic coal. This study adopts the low-temperature nitrogen adsorption method, mercury injection experiment, and other methods, combined with fractal theory, to quantitatively analyze the pore distribution of coal samples inside and outside the outburst cavities of the Sanjia coal mine. The experiments have shown that the contents of aliphatic functional groups and hydrogen in tectonic coal are higher than those of aromatic structural functional groups. Raw coal has more straight chains than side chains, whereas aliphatic hydrocarbon mostly has short chains, and the branching degree is high. Soft and primary-structure coals have similar elemental content and tectonic effects endow the coal with better connectivity. The pores are filled with particles and flakes, and the surfaces of tectonic coal have more pores and fissures on them. According to the experimental curve, the pores are divided into five types. The pore size of primary-structure coal is mainly type II pores, and the pore size distribution of tectonic coal is relatively wide, with the majority being class I and class II pores. The specific surface area of tectonic coal is 60.7% more than that of primary-structure coal. The box fractal dimension of coal decreases with the increase in scanning electron microscopy (SEM) magnification. The minimum fractal dimension of tectonic coal is 2.49, which is 7.8% lower than the peak of 2.70. It can be seen from the fractal dimension that the fractal dimensions of pore types II, III, and IV are rougher.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pore Characteristics and Fractal Dimension Analysis of Tectonic Coal and Primary-Structure Coal: A Case Study of Sanjia Coal Mine in Northern Guizhou

et al. 2022

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“…Remarks: The morphological details of the retrieved pollen that can be observed with LM and SEM are very similar to the pollen of several modern species of the Ericacean genus Kalmia L., especially K. angustifolia L. and K. polifolia Wangenh. (Sarwar and Takahashi 2012), as well as to fossil pollen tetrads from the Eocene of the Borken coal field in Germany described as Kalmia-type by Hofmann and Gregor (2018) as well as Hofmann (2018). Although a tectate margo has not been described or illustrated in these studies, it is known from pollen of modern Kalmia procumbens (L.) Gift, Kron and P.F.…”

Section: Systematic Palaeobotanymentioning

confidence: 86%

“…The hitherto oldest known record of Kalmia-type pollen tetrads was described from the Eocene of the Borken coalfield in Hesse, Germany (Hofmann 2018). From this locality, this pollen type had previously been identified as ?Ericipites callidus based only on LM (Hottenrott et al 2010), whereas a combined LM and SEM study revealed close similarities to pollen tetrads of modern Kalmia (Hofmann and Gregor 2018;Hofmann 2018).…”

Section: Discussionmentioning

confidence: 99%

Menatanthus mosbruggeri gen. nov. et sp. nov. – A flower with in situ pollen tetrads from the Paleocene maar lake of Menat (Puy-de-Dôme, France)

Uhl

Paudayal

Hervet³

et al. 2020

Palaeobio Palaeoenv

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The Paleocene Fossil-Lagerstätte Menat in France is well known for its wealth of outstandingly well preserved fossil insects and plants. Despite being known for more than a century, the palaeoflora, which is regarded as typical for the late Thanetian by some authors, has largely been neglected since the 1940s. New excavations and surveys yielded exceptionally well-preserved plant material, including a minute, heptamerous flower bearing in situ pollen tetrads, comparable to tetrads of the modern ericacean genus Kalmia L, in its anthers. The only known modern ericacean genus which is characterised by heptamerous flowers is Bejaria Mutis ex L., a basal relative of the tribe Phyllodoceae within Ericaceae, which also includes the genus Kalmia in a relatively basal position. However, heptamerous flowers also occur very rarely (mostly interpreted as teratologies) in a number of other modern Ericaceae, but also in various other modern angiosperm families. Due to the unique combination of a heptamerous flower with Kalmia-type pollen tetrads within the anthers, the new taxon Menatanthus mosbruggeri gen. nov. et sp. nov. is erected. The lack of morphological data from the flower itself and the fact that comparable pollen tetrads can be produced by a number of modern families, however, prevent an assignment of the new taxon to any known angiosperm family.

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“…Mitsumoto et al 2009;Steemans et al 2010;Urban et al 2010). This approach has shown that more traditional approaches utilizing only light microscopy tend to underestimate the number of taxa present in a palynoflora (Hofmann and Gregor 2018).…”

mentioning

confidence: 99%

Palaeobotanical experiences of plant diversity in deep time. 1: How well can we identify past plant diversity in the fossil record?

Cleal

Pardoe

Berry

et al. 2021

Palaeogeography, Palaeoclimatology, Palaeoecology

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Scanning electron microscope and light microscope investigations of pollen from an atypical mid-Eocene coal facies in Stolzenbach mine (PreußenElektra) near Borken (Kassel, Lower Hesse, Germany)

Cited by 17 publications

References 65 publications

Pore Characteristics and Fractal Dimension Analysis of Tectonic Coal and Primary-Structure Coal: A Case Study of Sanjia Coal Mine in Northern Guizhou

Pore Characteristics and Fractal Dimension Analysis of Tectonic Coal and Primary-Structure Coal: A Case Study of Sanjia Coal Mine in Northern Guizhou

Menatanthus mosbruggeri gen. nov. et sp. nov. – A flower with in situ pollen tetrads from the Paleocene maar lake of Menat (Puy-de-Dôme, France)

Palaeobotanical experiences of plant diversity in deep time. 1: How well can we identify past plant diversity in the fossil record?

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