<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Gesteinsgebundene Gase in den Salzlagerstätten des Werra-\r\nFulda-Kalireviers: Relevanz für die Lagerstättensicherheit und\r\nEinblick in die Bildung von Klimagasen und ozonzerstörenden\r\nVerbindungen bei Intraplattenvulkanismus"^^ . "The long mining history of the Werra-Fulda potash district is characterized by highly frequent\r\ngas-induced rock bursts during the extraction of potassium and magnesium salts. The gas was\r\ntrapped by magmatic alterations of the Permian salt deposit during the Miocene Rhön\r\nvolcanism. Large gas inclusions in the salt rocks pose a hazard to man and machinery during\r\nmining activities.\r\nThe investigation of the gas content of the magmatic and saline rocks of the Werra-Fulda potash\r\ndistrict combines applied research on hazard prevention in active mining with fundamental\r\nresearch on gas formation by contact metamorphism of intra-plate volcanism. In this context,\r\nthe Werra-Fulda potash district offers the rare opportunity of sampling magmatic rocks\r\nunderground and at the surface. The aim was to obtain fundamental information on the\r\nmechanisms of gas formation, storage, and release.\r\nThe highest gas concentrations (up to 1.8 mg*g-1), which consist mainly of CO2, could be\r\ndetected in magmatic rocks and magmatite-associated salt alterations. The trace gas\r\ndistributions (CH4, CH3Cl, N2O) in magmatite-salt profiles provide evidence for petrological\r\nrelationships with high gas contents. The stable carbon isotopic value of CO2 in extremely gasenriched\r\nsalt rocks (Knistersalze) allowed the development of a novel mathematical-analytical\r\nmethod for hazard prevention, by which the proportions of three CO2 sources in active mining\r\ncan be determined in real time. The applicability of this method must first be tested extensively\r\nin active mining.\r\nIn this study, the four potent climate gases CO2, CH4, CH3Cl and N2O were detected in the\r\nmagmatic rocks of the Werra-Fulda potash district. By comparing the gas content of the\r\nmagmatic rocks of the surface with equivalent rocks from the subsurface mining area, it could\r\nbe inferred that the gases were released from the magmatic melts when they reached the surface.\r\nThe stable carbon isotopic value of CO2 in rock samples with high gas accumulations showed\r\na typical magmatic source signature. Additionally, the stable isotopic values in CH4 and the\r\nBernard ratio (C1/C2+C3) indicate a thermogenic CH4 formation. Studies of organic material in\r\nthe footwall area indicate contact metamorphic formation of CH4 during the intrusions.\r\nFurthermore, with CH3Cl, a compound with high O3-depleting properties was detected which\r\nwas supposedly at least partly responsible for the largest mass extinction in earth's history.\r\nII\r\nThe formation of CH3Cl by the Siberian Trap volcanism during the Permian-Triassic boundary\r\nled to the destruction of the stratospheric O3 layer. The Conversion of hydrocarbons into CH3Cl\r\ncould have occurred via the Hoechst process, by redox-sensitive minerals, or in the presence of\r\nhighly activated surfaces during crystallization. Further information about the formation\r\nmechanism could be provided by future isotopic characterizations of CH3Cl.\r\nIn addition to CH3Cl, N2O as another strong O3-depleting compound was found in the context\r\nof intra-plate volcanism for the first time, which additionally has a high climatic impact. If the\r\nso far unrecognized N2O formation is indeed common in intraplate volcanism settings, the\r\nenvironmental effect of such volcanism might have been underestimated in the past.\r\nCombining the detected gas concentrations of the four climate gases in the magmatic rocks with\r\ntheir GWP, the relative contributions to climate warming by Miocene volcanism of the Werra-\r\nFulda potash district can be accounted for 60 % to CO2, 7 % to CH4, < 1 % to CH3Cl and 33 %\r\nto N2O. Thus, based on this work, N2O has the second highest climate impact of the detected\r\ngreenhouse gases in the studied area, even though it has previously been unrecognized in\r\nmagmatic systems.\r\nThe nitrogen source for the formation of N2O may be located within rocks in the footwall of\r\nthe salt deposit. The formation mechanism(s) could not be identified within the scope of this\r\nwork. However, in the magmatic rocks, nitrogen compounds could be detected in the oxidation\r\nstates from -III to +V, which means that the formation of N2O may have occurred by both\r\nreduced and oxidized nitrogen compounds. Moreover, the isotopic fingerprint of the newly\r\ndiscovered N2O source was determined to be 15NBulkN2O = 10.6 ± 5.3 ‰ (Air) and 18ON2O =\r\n47.6 ± 5.9 ‰ (VSMOW).\r\nIf the formation of N2O occurred throughout the CEVP, it could have contributed massively to\r\nthe Miocene temperature maximum. The results also show that N2O could cause up to 70 times\r\ngreater O3 destruction during intra-plate volcanism due to its higher enrichment compared to\r\nCH3Cl. If N2O was also formed during the Siberian Trap intrusions at the Permian-Triassic\r\nboundary, it could be responsible for the largest mass extinction in Earth's history."^^ . "2023" . . . . . . . "Marcus"^^ . "Schneider"^^ . "Marcus Schneider"^^ . . . . . . "Gesteinsgebundene Gase in den Salzlagerstätten des Werra-\r\nFulda-Kalireviers: Relevanz für die Lagerstättensicherheit und\r\nEinblick in die Bildung von Klimagasen und ozonzerstörenden\r\nVerbindungen bei Intraplattenvulkanismus (PDF)"^^ . . . "Dissertation Marcus Schneider PDFA.pdf"^^ . . . "Gesteinsgebundene Gase in den Salzlagerstätten des Werra-\r\nFulda-Kalireviers: Relevanz für die Lagerstättensicherheit und\r\nEinblick in die Bildung von Klimagasen und ozonzerstörenden\r\nVerbindungen bei Intraplattenvulkanismus (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Gesteinsgebundene Gase in den Salzlagerstätten des Werra-\r\nFulda-Kalireviers: Relevanz für die Lagerstättensicherheit und\r\nEinblick in die Bildung von Klimagasen und ozonzerstörenden\r\nVerbindungen bei Intraplattenvulkanismus (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Gesteinsgebundene Gase in den Salzlagerstätten des Werra-\r\nFulda-Kalireviers: Relevanz für die Lagerstättensicherheit und\r\nEinblick in die Bildung von Klimagasen und ozonzerstörenden\r\nVerbindungen bei Intraplattenvulkanismus (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Gesteinsgebundene Gase in den Salzlagerstätten des Werra-\r\nFulda-Kalireviers: Relevanz für die Lagerstättensicherheit und\r\nEinblick in die Bildung von Klimagasen und ozonzerstörenden\r\nVerbindungen bei Intraplattenvulkanismus (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Gesteinsgebundene Gase in den Salzlagerstätten des Werra-\r\nFulda-Kalireviers: Relevanz für die Lagerstättensicherheit und\r\nEinblick in die Bildung von Klimagasen und ozonzerstörenden\r\nVerbindungen bei Intraplattenvulkanismus (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #33644 \n\nGesteinsgebundene Gase in den Salzlagerstätten des Werra- \nFulda-Kalireviers: Relevanz für die Lagerstättensicherheit und \nEinblick in die Bildung von Klimagasen und ozonzerstörenden \nVerbindungen bei Intraplattenvulkanismus\n\n" . "text/html" . . . "550 Geowissenschaften"@de . "550 Earth sciences"@en . .