{"id":4571,"date":"2026-06-11T12:33:32","date_gmt":"2026-06-11T03:33:32","guid":{"rendered":"https:\/\/geo.kankyo.tohoku.ac.jp\/gmel2\/?p=4571"},"modified":"2026-07-01T12:35:58","modified_gmt":"2026-07-01T03:35:58","slug":"seminer-10","status":"publish","type":"post","link":"https:\/\/geo.kankyo.tohoku.ac.jp\/gmel2\/index.php\/2026\/06\/11\/seminer-10\/","title":{"rendered":"\u7b2c\uff11\uff16\u56de \u5ca9\u77f3\u30fc\u6d41\u4f53\u30bb\u30df\u30ca\u30fc\u3092\u884c\u3044\u3001\u30a4\u30f3\u30c9\u5de5\u79d1\u5927\u306eBehera\u3055\u3093\u306b\u8b1b\u6f14\u3044\u305f\u3060\u304d\u307e\u3057\u305f"},"content":{"rendered":"\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-4e54b06c2e99905b8863756f1880eb7d wp-block-paragraph\">2026\u5e746\u670811\u65e5\u306b\u7b2c16\u56de\u5ca9\u77f3\u30fc\u6d41\u4f53\u30bb\u30df\u30ca\u30fc\u3092\u884c\u3044\u307e\u3057\u305f\u3002\u8b1b\u6f14\u8005\u306f<em>Indian Institute of Technology Kanpur\u306e<\/em> Subhrajyoti Behera \u3055\u3093\u3067\u3001\u30a4\u30f3\u30c9\u306e<strong>North Singhbhum Mobile Belt<\/strong>\u306b\u304a\u3051\u308b\u5ca9\u76f8\u5883\u754c\u306e\u53cd\u5fdc\u5e2f\u306b\u304a\u3051\u308b\u7269\u8cea\u79fb\u52d5\u3084\u5909\u5f62\u306b\u3064\u3044\u3066\u6d3b\u767a\u306a\u8b70\u8ad6\u304c\u884c\u308f\u308c\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-ba657e90f114cf874aad2cae61729225 wp-block-paragraph\">Fluid<strong>-Rock Interactions and Its Effect in Mid-Crustal Conditions: An Example from North Singhbhum Mobile Belt, Eastern India<\/strong><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-f31995f7d72032c7be6c2105dd177486 wp-block-paragraph\"><strong>Subhrajyoti Behera<\/strong><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-aec79fc9e3f4f284fd1b4d2ac35021b3 wp-block-paragraph\"><em>Experimental Rock Deformation Laboratory, Department of Earth Sciences, Indian Institute of Technology Kanpur, Kanpur, India<\/em><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-cf0d4d660160e7061329ffc9064c00b5 wp-block-paragraph\"><strong>Abstract:<\/strong><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-6abca42b02d6d4c8cf101e07ad2e01e7 wp-block-paragraph\">Fluids play a major role crustal evolution by reacting with rocks, altering mineral composition, and redistributing chemical elements. However, fluid-mediated mass transfer\u2013 including mobility of traditionally \u201cimmobile\u201d REEs and HFSEs, remains poorly understood due to complex nature of fluid-rock interaction. My work investigates metasomatic reaction zones (MRZs) preserved at lithological contacts between meta-mafic dykes and pelitic garnet-mica schists in the Proterozoic North Singhbhum Mobile Belt, India.&nbsp;<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-8d8112c04ee10867382fad1ab90e0ad9 wp-block-paragraph\">The outcrop sequence: Dyke (<em>epidote-amphibolite<\/em>)\u2013Zone 1 (<em>amphibole-epidote-calcic-plagioclase-quartz-chlorite<\/em>)\u2013Zone 2 (<em>Zone 1 assemblage minus amphibole<\/em>)\u2013pelitic schist, records systematic fluid-rock interaction. Using EQ3\/6 reaction-path modeling, bulk-rock and mineral geochemistry, pseudosection modeling, and hydrothermal experiments, I show that the MRZs formed during post-peak retrogradation and thermal relaxation at ~1\u20133 kbar and 300\u2013500\u00b0C. Saline fluids pre-equilibrated with the mafic dykes drove MRZ formation upon reacting with the pelitic schist, with mineral assemblage variations reflecting differences in time-integrated fluid-to-rock ratios, resulting in significant REE (50\u201387%) and HFSE (43\u201363%) depletion within the MRZs. Additionally, EBSD analysis of quartz within MRZs reveals that fluid-rock interaction intensity, not just temperature, control microstructural evolution, intragrain structures, and slip-system activation.<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-d3d7689b4ef631a1c0b61242fdccfc33 wp-block-paragraph\">These results highlight the fundamental role of fluids in governing coupled physico-chemical processes during crustal evolution.<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-c5a3870dc5c7fdb48bfa71342a884651 wp-block-paragraph\"><strong>Keywords<\/strong>: fluid-rock interactions, element mobility, reaction-path modeling, EBSD<\/p>\n","protected":false},"excerpt":{"rendered":"<p>2026\u5e746\u670811\u65e5\u306b\u7b2c16\u56de\u5ca9\u77f3\u30fc\u6d41\u4f53\u30bb\u30df\u30ca\u30fc\u3092\u884c\u3044\u307e\u3057\u305f &#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[157],"tags":[],"class_list":["post-4571","post","type-post","status-publish","format-standard","hentry","category-kibans_s_r8"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"2026\u5e746\u670811\u65e5\u306b\u7b2c16\u56de\u5ca9\u77f3\u30fc\u6d41\u4f53\u30bb\u30df\u30ca\u30fc\u3092\u884c\u3044\u307e\u3057\u305f\u3002\u8b1b\u6f14\u8005\u306fIndian Institute of\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Atsushi OKAMOTO\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/geo.kankyo.tohoku.ac.jp\/gmel2\/index.php\/2026\/06\/11\/seminer-10\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta 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