{"id":1213,"date":"2017-11-18T20:40:17","date_gmt":"2017-11-18T19:40:17","guid":{"rendered":"http:\/\/sga.cuni.cz\/?p=1213"},"modified":"2020-12-04T10:29:45","modified_gmt":"2020-12-04T09:29:45","slug":"field-trip-sw-part-of-bohemian-massif-various-deposit-cooperation-with-baltic-student-chapter","status":"publish","type":"post","link":"https:\/\/sga.cuni.cz\/?p=1213","title":{"rendered":"Field trip: SW part of Bohemian Massif- various deposit, cooperation with Baltic Student Chapter"},"content":{"rendered":"\n

Heritage\nStone excursion to the Southwestern part of the Bohemian Massif<\/strong><\/p>\n\n\n\n

Eli\u0161ka\nBr\u0161licov\u00e1, Marek Tuh\u00fd, Rafael Baieta<\/p>\n\n\n\n

SGA Student Chapter Prague, Faculty of Sciences, Charles University, Albertov 6, 128 43 Prague 2, Czech Republic; brslicoe@natur.cuni.cz<\/em><\/p>\n\n\n\n

Photos album link: https:\/\/www.zonerama.com\/SGA-Prague\/Album\/3956885<\/a><\/p>\n\n\n\n

The\n2017 autumn field trip organized by SGA Student Chapter Prague took\nits participants to some world-famous locations, such\nas Komorn\u00ed H\u016frka,\nK\u00f6ssain, St\u0159\u00edbro and Ka\u0161persk\u00e9 Hory. Here, we saw the heritage\nstones of the southwestern\nregion of the Bohemian Massif.<\/p>\n\n\n\n

Day\n1<\/p>\n\n\n\n

We\nstarted the day with a visit to the\nTis u Blatna quarry (Fig. 1), which is currently mined by GRANIO\ns.r.o. The special type of granite at this site is locally called\n\u201cCzech Labradorite\u201d due to its bluish hues that are caused by\nquartz. Afterwards we visited localities near Horn\u00ed\nSlavkov with\nSn-W-Mo-Cu-rich\nquartz\nveins. First\nlocality Huber\u016fv pe\u0148 used to be\nmined for Sn and W. The erlan mineralization allows for fairly large\ncrystals of cassiterite to be found alongside wolframite, green and\nviolet apatite, chalcopyrite, topaz, molybdenite and violet fluorite.\nThe second locality in this area, Vysok\u00fd\nk\u00e1men, is a\ngreisen-type deposit, where green spheroid chalcosiderite-turquoise\nchain minerals were formed during decomposition. Finally, we visited\nthe \u0160tensk\u00e1\nu Tepl\u00e9\nquarry, the only locality in Czech Republic where trachyte is mined.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Fig.\n1: Tis u Blatna quarry. Photo by M. Vopat.<\/em><\/p>\n\n\n\n

Day\n2<\/p>\n\n\n\n

In\nthe morning, we arrived to Komorn\u00ed H\u016frka (Fig. 2), one of the\nyoungest volcanoes in the Czech Republic, with its age being\nestimated between 200 000 and 1 million years. Kormorn\u00ed H\u016frka is a\nstratovolcano, with interchanging eruptions of basaltic lava flows\nand pyroclastic deposition, both tuff and volcanic bombs can be found\nat this locality. Afterwards we moved on to Marktredwitz (Fig. 3)\nwhere the highway cuts through an assortment of redwitz, from\ngranodioritic to gabbroitic. The next point of interest was Blue\nGranite in Pfalzbrunnen quarry outside of K\u00f6ssain. The granite here\nis being mined for 100 years and is prized for its porphyric\nstructure and fine quality.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Fig.\n2: Goethe\u2019<\/em>s\nadit for research purposes at <\/em>Komorn\u00ed\nH\u016frka. Photo by M. Vopat.<\/em><\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Fig.\n3: Feldspars at Marktredwitz. Photo by M. Vopat.<\/em><\/p>\n\n\n\n

Day\n3<\/p>\n\n\n\n

We\nvisited St\u0159\u00edbro (Fig. 4), a famous Czech locality with Pb-Zn\nmineralization and a great history of mining. The first known\ndocument referring to the silver mines is from the 12th<\/sup>\ncentury. Silver was mined in this area throughout the Medieval ages,\nthen around the 16th<\/sup>\ncentury, lead started being mainly mined. The veins contain multiple\nquartz generations along with galenite, sphalerite, pyrite with\nmarcasite and occasionally chalcopyrite. Then, we moved to a uranium\ndeposit Dam\u011btice. It used to be a small mining area. The upper part\nof the deposit is oxidized and its possible to find uranium micas\nsuch as uranocircite, autunite and torbernite while the lower deposit\ncontain primary mineral uraninite. Later, we visited an old marble\nquarry in Nezdice na \u0160umav\u011b.\nThe marble in the lower part of the quarry has a beautiful sky-blue\ncolor and contains fine needles of wollastonite. We ended our day in\nKa\u0161persk\u00e9 Hory,\nan area full of historical gold mines from the 10th<\/sup>\nand 14th<\/sup>\ncentury. The latest geological survey still shows deposits of gold\nwith 5.6 ppm Au.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Fig.\n4: St\u0159\u00edbro, heap from Pb-Zn mine. Photo by J. Myslive\u010dek.<\/em><\/p>\n\n\n\n

Day\n4<\/p>\n\n\n\n

We\narrived early to Malenice (Fig.5), where we observed migmatite and\nparagneiss boulders containing almandines. Tetragonal trioctahedral\nand rhombic dodecahedral crystals can be found here or the\ncombination of both. Than we explored the locality Sepekov and we\nfound a group of hercynite spinel-rich rocks and varying content of\nphlogopite located on the contact of a gneiss-migmatite and\ntourmaline granite rock bodies. We ended our field trip in Kr\u00e1sn\u00e1\nHora nad Vltavou\nat an extensive mineralization of gold and antimonic veins stretching\nthroughout the area. We searched around an old rock pile from the\nmine shaft Emilka consisting of red stained granite with antimony\ncrystals and grains.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Fig.\n5: Malenice, paragneiss containing almandines. Photo by D. Br\u00e9m.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Heritage Stone excursion to the Southwestern part of the Bohemian Massif Eli\u0161ka Br\u0161licov\u00e1, Marek Tuh\u00fd, Rafael Baieta SGA Student Chapter Prague, Faculty of Sciences, Charles University, Albertov 6, 128 43 Prague 2, Czech Republic; brslicoe@natur.cuni.cz Photos album link: https:\/\/www.zonerama.com\/SGA-Prague\/Album\/3956885 The 2017 autumn field trip organized by SGA Student Chapter Prague \u2026 Continue reading → <\/span><\/a><\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[3,4],"tags":[],"class_list":["post-1213","post","type-post","status-publish","format-standard","hentry","category-events","category-our-activities"],"_links":{"self":[{"href":"https:\/\/sga.cuni.cz\/index.php?rest_route=\/wp\/v2\/posts\/1213","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sga.cuni.cz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sga.cuni.cz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sga.cuni.cz\/index.php?rest_route=\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/sga.cuni.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1213"}],"version-history":[{"count":3,"href":"https:\/\/sga.cuni.cz\/index.php?rest_route=\/wp\/v2\/posts\/1213\/revisions"}],"predecessor-version":[{"id":1256,"href":"https:\/\/sga.cuni.cz\/index.php?rest_route=\/wp\/v2\/posts\/1213\/revisions\/1256"}],"wp:attachment":[{"href":"https:\/\/sga.cuni.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1213"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sga.cuni.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1213"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sga.cuni.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}