Pub Date : 2020-04-09DOI: 10.1186/s00015-020-00358-2
I. Ghandour
{"title":"Correction to: Paleoenvironmental changes across the Paleocene–Eocene boundary in West Central Sinai, Egypt: geochemical proxies","authors":"I. Ghandour","doi":"10.1186/s00015-020-00358-2","DOIUrl":"https://doi.org/10.1186/s00015-020-00358-2","url":null,"abstract":"","PeriodicalId":49456,"journal":{"name":"Swiss Journal of Geosciences","volume":" ","pages":"1"},"PeriodicalIF":3.1,"publicationDate":"2020-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s00015-020-00358-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45046438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-04-06DOI: 10.1186/s00015-020-00356-4
A. Berger, M. Engi, Silja Erne-Schmid, C. Glotzbach, C. Spiegel, Rick de Goede, M. Herwegh
{"title":"The relation between peak metamorphic temperatures and subsequent cooling during continent–continent collision (western Central Alps, Switzerland)","authors":"A. Berger, M. Engi, Silja Erne-Schmid, C. Glotzbach, C. Spiegel, Rick de Goede, M. Herwegh","doi":"10.1186/s00015-020-00356-4","DOIUrl":"https://doi.org/10.1186/s00015-020-00356-4","url":null,"abstract":"","PeriodicalId":49456,"journal":{"name":"Swiss Journal of Geosciences","volume":"113 1","pages":"1-18"},"PeriodicalIF":3.1,"publicationDate":"2020-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s00015-020-00356-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49501926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-20DOI: 10.1186/s00015-020-00357-3
I. Ghandour
{"title":"Paleoenvironmental changes across the Paleocene–Eocene boundary in West Central Sinai, Egypt: geochemical proxies","authors":"I. Ghandour","doi":"10.1186/s00015-020-00357-3","DOIUrl":"https://doi.org/10.1186/s00015-020-00357-3","url":null,"abstract":"","PeriodicalId":49456,"journal":{"name":"Swiss Journal of Geosciences","volume":" ","pages":"1-16"},"PeriodicalIF":3.1,"publicationDate":"2020-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s00015-020-00357-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47673390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-24DOI: 10.1186/s00015-020-00355-5
D. Schwarz, P. Mannion, O. Wings, C. Meyer
{"title":"Re-description of the sauropod dinosaur Amanzia (“Ornithopsis/Cetiosauriscus”) greppini n. gen. and other vertebrate remains from the Kimmeridgian (Late Jurassic) Reuchenette Formation of Moutier, Switzerland","authors":"D. Schwarz, P. Mannion, O. Wings, C. Meyer","doi":"10.1186/s00015-020-00355-5","DOIUrl":"https://doi.org/10.1186/s00015-020-00355-5","url":null,"abstract":"","PeriodicalId":49456,"journal":{"name":"Swiss Journal of Geosciences","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2020-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s00015-020-00355-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42870287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-17DOI: 10.1186/s00015-020-00354-6
K. Bucher, T. Weisenberger, Sebastian Weber, O. Klemm, F. Corfu
{"title":"The Theodul Glacier Unit, a slab of pre-Alpine rocks in the Alpine meta-ophiolite of Zermatt-Saas, Western Alps","authors":"K. Bucher, T. Weisenberger, Sebastian Weber, O. Klemm, F. Corfu","doi":"10.1186/s00015-020-00354-6","DOIUrl":"https://doi.org/10.1186/s00015-020-00354-6","url":null,"abstract":"","PeriodicalId":49456,"journal":{"name":"Swiss Journal of Geosciences","volume":" ","pages":"1-22"},"PeriodicalIF":3.1,"publicationDate":"2020-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s00015-020-00354-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48608903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01Epub Date: 2020-12-07DOI: 10.1186/s00015-020-00372-4
Alice Vho, Daniela Rubatto, Pierre Lanari, Daniele Regis
Microscale dating of distinct domains in minerals that contain relics of multiple metamorphic events is a key tool to characterize the polyphase evolution of complex metamorphic terranes. Zircon and allanite from five metasediments and five metaintrusive high-pressure (HP) rocks from the Eclogite Micaschist Complex of the Sesia Zone were dated by SIMS and LA-ICP-MS. In the metasediments, zircon systematically preserves detrital cores and one or two metamorphic overgrowths. An early Permian age is obtained for the first zircon rim in metasediments from the localities of Malone Valley, Chiusella Valley and Monte Mucrone (292 ± 11, 278.8 ± 3.6 and 285.9 ± 2.9 Ma, respectively). In the Malone Valley and Monte Mucrone samples, the early Permian ages are attributed to high-temperature metamorphism and coincide with the crystallization ages of associated mafic and felsic intrusions. This implies that magmatism and metamorphism were coeval and associated to the same tectono-metamorphic extensional event. In the Malone Valley, allanite from a metasediment is dated at 241.1 ± 6.1 Ma and this age is tentatively attributed to a metasomatic/metamorphic event during Permo-Triassic extension. Outer zircon rims with a late Cretaceous age (67.4 ± 1.9 Ma) are found only in the micaschist from Monte Mucrone. In metagabbro of the Ivozio Complex, zircon cores yield an intrusive age for the protolith of 340.7 ± 6.8 Ma, whereas Alpine allanite are dated at 62.9 ± 4.2 and 55.3 ± 7.3 Ma. The Cretaceous ages constrain the timing of the HP metamorphic stage. The presence of zircon overgrowth only in the central area of the Eclogite Micaschist Complex is attributed to local factors such as (1) multiple fluid pulses at HP that locally enhanced zircon dissolution and recrystallization, and (2) slightly higher temperatures reached in this area during HP metamorphism.
{"title":"The evolution of the Sesia Zone (Western Alps) from Carboniferous to Cretaceous: insights from zircon and allanite geochronology.","authors":"Alice Vho, Daniela Rubatto, Pierre Lanari, Daniele Regis","doi":"10.1186/s00015-020-00372-4","DOIUrl":"https://doi.org/10.1186/s00015-020-00372-4","url":null,"abstract":"<p><p>Microscale dating of distinct domains in minerals that contain relics of multiple metamorphic events is a key tool to characterize the polyphase evolution of complex metamorphic terranes. Zircon and allanite from five metasediments and five metaintrusive high-pressure (HP) rocks from the Eclogite Micaschist Complex of the Sesia Zone were dated by SIMS and LA-ICP-MS. In the metasediments, zircon systematically preserves detrital cores and one or two metamorphic overgrowths. An early Permian age is obtained for the first zircon rim in metasediments from the localities of Malone Valley, Chiusella Valley and Monte Mucrone (292 ± 11, 278.8 ± 3.6 and 285.9 ± 2.9 Ma, respectively). In the Malone Valley and Monte Mucrone samples, the early Permian ages are attributed to high-temperature metamorphism and coincide with the crystallization ages of associated mafic and felsic intrusions. This implies that magmatism and metamorphism were coeval and associated to the same tectono-metamorphic extensional event. In the Malone Valley, allanite from a metasediment is dated at 241.1 ± 6.1 Ma and this age is tentatively attributed to a metasomatic/metamorphic event during Permo-Triassic extension. Outer zircon rims with a late Cretaceous age (67.4 ± 1.9 Ma) are found only in the micaschist from Monte Mucrone. In metagabbro of the Ivozio Complex, zircon cores yield an intrusive age for the protolith of 340.7 ± 6.8 Ma, whereas Alpine allanite are dated at 62.9 ± 4.2 and 55.3 ± 7.3 Ma. The Cretaceous ages constrain the timing of the HP metamorphic stage. The presence of zircon overgrowth only in the central area of the Eclogite Micaschist Complex is attributed to local factors such as (1) multiple fluid pulses at HP that locally enhanced zircon dissolution and recrystallization, and (2) slightly higher temperatures reached in this area during HP metamorphism.</p>","PeriodicalId":49456,"journal":{"name":"Swiss Journal of Geosciences","volume":"113 1","pages":"24"},"PeriodicalIF":3.1,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s00015-020-00372-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38722259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01Epub Date: 2020-10-26DOI: 10.1186/s00015-020-00368-0
Elias D Kempf, Jörg Hermann, Eric Reusser, Lukas P Baumgartner, Pierre Lanari
Metamorphic olivine formed by the reaction of antigorite + brucite is widespread in serpentinites that crop out in glacier-polished outcrops at the Unterer Theodulglacier, Zermatt. Olivine overgrows a relic magnetite mesh texture formed during ocean floor serpentinization. Serpentinization is associated with rodingitisation of mafic dykes. Metamorphic olivine coexists with magnetite, shows high Mg# of 94-97 and low trace element contents. A notable exception is 4 µg/g Boron (> 10 times primitive mantle), introduced during seafloor alteration and retained in metamorphic olivine. Olivine incorporated 100-140 µg/g H2O in Si-vacancies, providing evidence for low SiO2-activity imposed by brucite during olivine growth. No signs for hydrogen loss or major and minor element diffusional equilibration are observed. The occurrence of olivine in patches within the serpentinite mimics the former heterogeneous distribution of brucite, whereas the network of olivine-bearing veins and shear zones document the pathways of the escaping fluid produced by the olivine forming reaction. Relic Cr-spinels have a high Cr# of 0.5 and the serpentinites display little or no clinopyroxene, indicating that they derive from hydrated harzburgitic mantle that underwent significant melt depletion. The enrichment of Mg and depletion of Si results in the formation of brucite during seafloor alteration, a pre-requisite for later subduction-related olivine formation and fluid liberation. The comparison of calculated bulk rock brucite contents in the Zermatt-Saas with average IODP serpentinites suggests a large variation in fluid release during olivine formation. Between 3.4 and 7.2 wt% H2O is released depending on the magnetite content in fully serpentinized harzburgites (average oceanic serpentinites). Thermodynamic modelling indicates that the fluid release in Zermatt occurred between 480 °C and 550 °C at 2-2.5 GPa with the Mg# of olivine varying from 68 to 95. However, the majority of the fluid released from this reaction was produced within a narrow temperature field of < 30 °C, at higher pressures 2.5 GPa and temperatures 550-600 °C than commonly thought. Fluids derived from the antigorite + brucite reaction might thus trigger eclogite facies equilibration in associated metabasalts, meta-gabbros, meta-rodingites and meta-sediments in the area. This focused fluid release has the potential to trigger intermediate depths earthquakes at 60-80 km in subducted oceanic lithosphere.
{"title":"The role of the antigorite + brucite to olivine reaction in subducted serpentinites (Zermatt, Switzerland).","authors":"Elias D Kempf, Jörg Hermann, Eric Reusser, Lukas P Baumgartner, Pierre Lanari","doi":"10.1186/s00015-020-00368-0","DOIUrl":"https://doi.org/10.1186/s00015-020-00368-0","url":null,"abstract":"<p><p>Metamorphic olivine formed by the reaction of antigorite + brucite is widespread in serpentinites that crop out in glacier-polished outcrops at the Unterer Theodulglacier, Zermatt. Olivine overgrows a relic magnetite mesh texture formed during ocean floor serpentinization. Serpentinization is associated with rodingitisation of mafic dykes. Metamorphic olivine coexists with magnetite, shows high Mg# of 94-97 and low trace element contents. A notable exception is 4 µg/g Boron (> 10 times primitive mantle), introduced during seafloor alteration and retained in metamorphic olivine. Olivine incorporated 100-140 µg/g H<sub>2</sub>O in Si-vacancies, providing evidence for low SiO<sub>2</sub>-activity imposed by brucite during olivine growth. No signs for hydrogen loss or major and minor element diffusional equilibration are observed. The occurrence of olivine in patches within the serpentinite mimics the former heterogeneous distribution of brucite, whereas the network of olivine-bearing veins and shear zones document the pathways of the escaping fluid produced by the olivine forming reaction. Relic Cr-spinels have a high Cr# of 0.5 and the serpentinites display little or no clinopyroxene, indicating that they derive from hydrated harzburgitic mantle that underwent significant melt depletion. The enrichment of Mg and depletion of Si results in the formation of brucite during seafloor alteration, a pre-requisite for later subduction-related olivine formation and fluid liberation. The comparison of calculated bulk rock brucite contents in the Zermatt-Saas with average IODP serpentinites suggests a large variation in fluid release during olivine formation. Between 3.4 and 7.2 wt% H<sub>2</sub>O is released depending on the magnetite content in fully serpentinized harzburgites (average oceanic serpentinites). Thermodynamic modelling indicates that the fluid release in Zermatt occurred between 480 °C and 550 °C at 2-2.5 GPa with the Mg# of olivine varying from 68 to 95. However, the majority of the fluid released from this reaction was produced within a narrow temperature field of < 30 °C, at higher pressures 2.5 GPa and temperatures 550-600 °C than commonly thought. Fluids derived from the antigorite + brucite reaction might thus trigger eclogite facies equilibration in associated metabasalts, meta-gabbros, meta-rodingites and meta-sediments in the area. This focused fluid release has the potential to trigger intermediate depths earthquakes at 60-80 km in subducted oceanic lithosphere.</p>","PeriodicalId":49456,"journal":{"name":"Swiss Journal of Geosciences","volume":"113 1","pages":"16"},"PeriodicalIF":3.1,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s00015-020-00368-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38552712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1007/s00015-019-00350-5
Y. Makhloufi, E. Samankassou
{"title":"Geochemical constrains on dolomitization pathways of the Upper Jurassic carbonate rocks in the Geneva Basin (Switzerland and France)","authors":"Y. Makhloufi, E. Samankassou","doi":"10.1007/s00015-019-00350-5","DOIUrl":"https://doi.org/10.1007/s00015-019-00350-5","url":null,"abstract":"","PeriodicalId":49456,"journal":{"name":"Swiss Journal of Geosciences","volume":"112 1","pages":"579-596"},"PeriodicalIF":3.1,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s00015-019-00350-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42552881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1007/s00015-019-00349-y
V. Rime, Anna Sommaruga, M. Schori, J. Mosar
{"title":"Tectonics of the Neuchâtel Jura Mountains: insights from mapping and forward modelling","authors":"V. Rime, Anna Sommaruga, M. Schori, J. Mosar","doi":"10.1007/s00015-019-00349-y","DOIUrl":"https://doi.org/10.1007/s00015-019-00349-y","url":null,"abstract":"","PeriodicalId":49456,"journal":{"name":"Swiss Journal of Geosciences","volume":"1 1","pages":"1 - 16"},"PeriodicalIF":3.1,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s00015-019-00349-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46393914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1007/s00015-019-00338-1
M. Schönbächler, J. Hermann, J. Hammerli, T. Nägler, N. Greber
{"title":"Johannes Hämmerli and Nicolas Greber receive the 2018 Paul Niggli Medal","authors":"M. Schönbächler, J. Hermann, J. Hammerli, T. Nägler, N. Greber","doi":"10.1007/s00015-019-00338-1","DOIUrl":"https://doi.org/10.1007/s00015-019-00338-1","url":null,"abstract":"","PeriodicalId":49456,"journal":{"name":"Swiss Journal of Geosciences","volume":"112 1","pages":"619-622"},"PeriodicalIF":3.1,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s00015-019-00338-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44415021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}