scholarly journals Variable origin of clinopyroxene megacrysts carried by Cenozoic volcanic rocks from the eastern limb of Central European Volcanic Province (SE Germany and SW Poland)

Lithos ◽  
2021 ◽  
Vol 382-383 ◽  
pp. 105936
Author(s):  
Magdalena Matusiak-Małek ◽  
Jacek Puziewicz ◽  
Theodoros Ntaflos ◽  
Alan Woodland ◽  
Laura Uenver-Thiele ◽  
...  
Keyword(s):  
Volcanic Rocks ◽  
Volcanic Province ◽  
Central European ◽  
Sw Poland ◽  
Eastern Limb ◽  
Central European Volcanic Province ◽  
Variable Origin ◽  
Clinopyroxene Megacrysts

A new volcanic province: evidence from glacial erratics in western North Greenland

2000 ◽  
pp. 35-41 ◽  
Author(s):  
Peter R. Dawes ◽  
Bjørn Thomassen ◽  
T.I. Hauge Andersson
Keyword(s):  
Volcanic Rocks ◽  
Iron Formation ◽  
Banded Iron Formation ◽  
Common Component ◽  
Volcanic Province ◽  
North West ◽  
North East ◽  
The North ◽  
Surficial Deposits ◽  
North Greenland

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Dawes, P. R., Thomassen, B., & Andersson, T. H. (2000). A new volcanic province: evidence from glacial erratics in western North Greenland. Geology of Greenland Survey Bulletin, 186, 35-41. https://doi.org/10.34194/ggub.v186.5213 _______________ Mapping and regional geological studies in northern Greenland were carried out during the project Kane Basin 1999 (see Dawes et al. 2000, this volume). During ore geological studies in Washington Land by one of us (B.T.), finds of erratics of banded iron formation (BIF) directed special attention to the till, glaciofluvial and fluvial sediments. This led to the discovery that in certain parts of Daugaard-Jensen Land and Washington Land volcanic rocks form a common component of the surficial deposits, with particularly colourful, red porphyries catching the eye. The presence of BIF is interesting but not altogether unexpected since BIF erratics have been reported from southern Hall Land just to the north-east (Kelly & Bennike 1992) and such rocks crop out in the Precambrian shield of North-West Greenland to the south (Fig. 1; Dawes 1991). On the other hand, the presence of volcanic erratics was unexpected and stimulated the work reported on here.

scholarly journals Relief evolution of landslide slopes in the Kamienne Mts (Central Sudetes, Poland) – analysis of a high-resolution DEM from airborne LiDAR

2018 ◽  
Vol 7 (1) ◽  
pp. 1-20 ◽  
Author(s):  
Aleksandra Osika ◽  
Małgorzata Wistuba ◽  
Ireneusz Malik
Keyword(s):  
Cross Sections ◽  
Volcanic Rocks ◽  
Sedimentary Rocks ◽  
Airborne Lidar ◽  
Lidar Data ◽  
Mountain Ridge ◽  
Geological Maps ◽  
Different Types ◽  
Sw Poland ◽  
Landslide Development

Abstract The aim of the study is to reconstruct the development of landslide relief in the Kamienne Mountains (Central Sudetes, SW Poland) based on a DEM from LiDAR data. Analyses of relief and geological maps in ArcGIS 10.5 and of slope cross-sections in Surfer 14 allowed to distinguish different types of landslide relief, developed in latites and trachybasalts lying above claystones and mudstones. The types vary from small, poorly visible landslides to vast landslides with complex relief. They were interpreted as consecutive stages of geomorphic evolution of hillslope-valley topography of the study area. Two main schemes have been established which explain the development of landslide slopes in the Kamienne Mts: (1) upslope, from the base of the slope towards the mountain ridge and (2) downslope, beginning on the top of the mountain ridge. The direction of landslide development depends on the thickness of volcanic rocks in relation to underlying sedimentary rocks. When the latter appear only in the lowest part of the slope, landslides develop upslope. If sedimentary rocks dominate on the slope and volcanic rocks form only its uppermost part, landslides develop downslope. The results show that landsliding leads to significant modifications of relief of the study area, including complete degradation of mountain ridges.

scholarly journals New records of rare lichenicolous and lichen-forming fungi from volcanic rocks in SW Poland

2015 ◽  
Vol 50 (1) ◽  
Author(s):  
Katarzyna Szczepańska
Keyword(s):  
New Records ◽  
Volcanic Rocks ◽  
Southwestern Part ◽  
New Host ◽  
Historical Collections ◽  
Sw Poland ◽  
Lower Silesia

<p>Records of two lichenicolous and nine lichen-forming fungi found in the southwestern part of Poland are presented. All of the reported species are very rare and they have only a few scattered localities in the country. One of them, <em>Lecanora pannonica</em>, is reported for the second time from Poland. Additionally, the new, contemporary records of <em>Cercidospora macrospora</em>, <em>Rhizocarpon disporum</em>, <em>R. viridiatrum</em> and <em>Stereocaulon pileatum</em> in Lower Silesia were noted. These species were known only from historical collections in the study area. Furthermore, <em>Lecidea fuscoatra</em> has been found a new host for <em>Sagediopsis barbara</em>. All of the localities of recorded species were found on natural outcrops of basalt rocks.</p>

Fe-Cu-S rich melts in the subcontinental lithospheric mantle: insight from the Lower Silesian (SW Poland) xenoliths

2020 ◽  
Author(s):  
Hubert Mazurek ◽  
Jakub Ciążela ◽  
Magdalena Matusiak-Małek ◽  
Jacek Puziewicz ◽  
Theodoros Ntaflos
Keyword(s):  
Lithospheric Mantle ◽  
Volcanic Rocks ◽  
Oceanic Lithosphere ◽  
Mantle Xenoliths ◽  
Subcontinental Lithospheric Mantle ◽  
Origin And Evolution ◽  
Depleted Mantle ◽  
Group A ◽  
Sw Poland ◽  
Group B

&lt;p&gt;Migration of strategic metals through the lithospheric mantle can be tracked by sulfides in mantle xenoliths. Cenozoic mafic volcanic rocks from the SW Poland (Lower Silesia, Bohemian Massif) host a variety of subcontinental lithospheric mantle (SCLM) xenoliths. To understand metal migration in the SCLM we studied metal budget of peridotites from the Wilcza G&amp;#243;ra basanite and their metasomatic history.&lt;/p&gt;&lt;p&gt;The Wilcza G&amp;#243;ra xenoliths are especially appropriate to study metasomatic processes as they consist of 1) peridotites with Ol&lt;sub&gt;Fo=89.1-91.5 &lt;/sub&gt;representing depleted mantle (group A); 2) peridotites with Ol&lt;sub&gt;Fo=84.2-89.2&lt;/sub&gt; representing melt-metasomatized mantle (group B), as well as 3) hornblende-clinopyroxenites and websterites with Ol&lt;sub&gt;Fo=77.2-82.5&lt;/sub&gt; representing former melt&amp;#160; channels (group C; Matusiak-Ma&amp;#322;ek et al., 2017). The inherent sulfides are either interstitial or enclosed in the silicates. High-temperature exsolutions of pyrrhotite (Po), pentlandite (Pn) and chalcopyrite (Ccp) indicate magmatic origin of the sulfides.&lt;/p&gt;&lt;p&gt;The three peridotitic groups differ by sulfide mode and composition. The sulfide modes are enhanced in group C (0.022-0.963 vol.&amp;#8240;) and group B (&lt;0.028 vol. &amp;#8240;) with respect to group A (&lt;0.002 vol.&amp;#8240;). The sulfides of group C are Ni-poor and Fe-Cu-rich as reflected in their mineral composition (Po&lt;sub&gt;55-74&lt;/sub&gt;Ccp&lt;sub&gt;1-2&lt;/sub&gt;Pn&lt;sub&gt;24-44&lt;/sub&gt; in group A, Po&lt;sub&gt;67-85&lt;/sub&gt;Ccp&lt;sub&gt;1-6&lt;/sub&gt;Pn&lt;sub&gt;14-33&lt;/sub&gt;, in group B and Po&lt;sub&gt;80-97&lt;/sub&gt;Ccp&lt;sub&gt;1-7&lt;/sub&gt;Pn&lt;sub&gt;2-20 &lt;/sub&gt;in group C) and major element chemical composition. Ni/(Ni+Fe) of pentlandite is the lowest in group C (~0.25) and the highest in group A (0.54-0.61). Cu/(Cu+Fe) of chalcopyrite is 0.32-0.49 in group C contrasting to~0.50 in groups A and B.&amp;#160;&lt;/p&gt;&lt;p&gt;The sulfide-rich xenoliths of group C indicate an important role of pyroxenitic veins in transporting Fe-Cu-S-rich melts from the upper mantle to the crust. However, the moderately enhanced sulfide modes in melt-mantle reaction zones represented by xenoliths of group B demonstrate that the upper continental mantle is refertilized with these melts during their ascent. Hence, significant portion of S and metals remains in the mantle never reaching the crust, as has been previously observed in the oceanic lithosphere (Ciazela et al., 2018).&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Acknowledgments:&lt;/strong&gt; This study was supported by the NCN project no. UMO-2014/15/B/ST10/00095. The EPMA analyses were funded from the Polish-Austrian project WTZ PL 08/2018.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;&lt;strong&gt;References:&lt;/strong&gt;&lt;/p&gt;&lt;p&gt;Ciazela, J., Koepke, J., Dick, H. J. B., Botcharnikov, R., Muszynski, A., Lazarov, M., Schuth, S., Pieterek, B. &amp; Kuhn, T. (2018). Sulfide enrichment at an oceanic crust-mantle transition zone: Kane Megamullion (23 N, MAR). Geochimica et Cosmochimica Acta, 230, 155-189&lt;/p&gt;&lt;p&gt;Matusiak-Ma&amp;#322;ek, M., Puziewicz, J., Ntaflos, T., Gr&amp;#233;goire, M., Kuku&amp;#322;a, A. &amp; Wojtulek P.&amp;#160;&amp;#160; M. (2017). Origin and evolution of rare amphibole-bearing mantle peridotites from Wilcza G&amp;#243;ra (SW Poland), Central Europe. Lithos 286&amp;#8211;287, 302&amp;#8211;323.&lt;/p&gt;

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