Contrasting platinum-group mineral assemblages from chromitites of the Nizhny Tagil and Guli massifs (Russia): Implications for composition, sources and age
The Nizhny Tagil and Guli clinopyroxenite-dunite massifs, located in the Middle Urals and Maimecha-Kotui Province, respectively, are associated with world-class platinum-group elements (PGE) placer deposits. Both massifs contain small bodies of schlieren to massive chromitite associated with dunite....
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description | The Nizhny Tagil and Guli clinopyroxenite-dunite massifs, located in the Middle Urals and Maimecha-Kotui Province, respectively, are associated with world-class platinum-group elements (PGE) placer deposits. Both massifs contain small bodies of schlieren to massive chromitite associated with dunite. The predominance of Pt-Fe alloys at Nizhny Tagil is consistnt with the whole-rock “M”-shaped mantle-normalized PGE pattern of the chromitite. In contrast, the preponderance of laurite and Os-Ir alloys at Guli is consistent with a negatively sloped PGE pattern, the latter being characteristic of ophiolite-type podiform chromitites. The ‘unradiogenic’
187
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188
Os values obtained for both platinum-group minerals (PGM) and chromitite are indicative of a common near-to-chondritic source for the PGE and implies that the osmium isotope budget of chromitite is largely controlled by laurite and Os-rich alloy. Average model
187
Os/
188
Os ages calculated for the Nizhny Tagil and Guli massifs correspond to the late Riphean (e.g., 862 ± 48 Ma and 616 ± 8 Ma, respectively). The compositional and isotope-geochemical results provide new constraints on the temporal evolution of ultramafic rocks of the Uralian Platinum Belt and northern segment of the Siberian Platform. |
doi_str_mv | 10.1134/S1028334X11110067 |
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187
Os/
188
Os values obtained for both platinum-group minerals (PGM) and chromitite are indicative of a common near-to-chondritic source for the PGE and implies that the osmium isotope budget of chromitite is largely controlled by laurite and Os-rich alloy. Average model
187
Os/
188
Os ages calculated for the Nizhny Tagil and Guli massifs correspond to the late Riphean (e.g., 862 ± 48 Ma and 616 ± 8 Ma, respectively). The compositional and isotope-geochemical results provide new constraints on the temporal evolution of ultramafic rocks of the Uralian Platinum Belt and northern segment of the Siberian Platform.</description><identifier>ISSN: 1028-334X</identifier><identifier>EISSN: 1531-8354</identifier><identifier>DOI: 10.1134/S1028334X11110067</identifier><language>eng</language><publisher>Dordrecht: SP MAIK Nauka/Interperiodica</publisher><subject>Age ; Alloys ; Budgeting ; Deposition ; Earth and Environmental Science ; Earth Sciences ; Geology ; Massifs ; Mathematical models ; Mineralogy ; Minerals ; Mines and mineral resources ; Ophiolites ; Osmium ; Platinum ; Platinum base alloys ; Rocks</subject><ispartof>Doklady earth sciences, 2011-11, Vol.441 (1), p.1514-1518</ispartof><rights>Pleiades Publishing, Ltd. 2011</rights><rights>COPYRIGHT 2011 Springer</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a443t-251fb57f06038fea80e1398325bade07822193c661fe37f75c313f638a686d143</citedby><cites>FETCH-LOGICAL-a443t-251fb57f06038fea80e1398325bade07822193c661fe37f75c313f638a686d143</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1134/S1028334X11110067$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1134/S1028334X11110067$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27923,27924,41487,42556,51318</link.rule.ids></links><search><creatorcontrib>Malitch, K. N.</creatorcontrib><creatorcontrib>Efimov, A. A.</creatorcontrib><creatorcontrib>Badanina, I. Yu</creatorcontrib><title>Contrasting platinum-group mineral assemblages from chromitites of the Nizhny Tagil and Guli massifs (Russia): Implications for composition, sources and age</title><title>Doklady earth sciences</title><addtitle>Dokl. Earth Sc</addtitle><description>The Nizhny Tagil and Guli clinopyroxenite-dunite massifs, located in the Middle Urals and Maimecha-Kotui Province, respectively, are associated with world-class platinum-group elements (PGE) placer deposits. Both massifs contain small bodies of schlieren to massive chromitite associated with dunite. The predominance of Pt-Fe alloys at Nizhny Tagil is consistnt with the whole-rock “M”-shaped mantle-normalized PGE pattern of the chromitite. In contrast, the preponderance of laurite and Os-Ir alloys at Guli is consistent with a negatively sloped PGE pattern, the latter being characteristic of ophiolite-type podiform chromitites. The ‘unradiogenic’
187
Os/
188
Os values obtained for both platinum-group minerals (PGM) and chromitite are indicative of a common near-to-chondritic source for the PGE and implies that the osmium isotope budget of chromitite is largely controlled by laurite and Os-rich alloy. Average model
187
Os/
188
Os ages calculated for the Nizhny Tagil and Guli massifs correspond to the late Riphean (e.g., 862 ± 48 Ma and 616 ± 8 Ma, respectively). The compositional and isotope-geochemical results provide new constraints on the temporal evolution of ultramafic rocks of the Uralian Platinum Belt and northern segment of the Siberian Platform.</description><subject>Age</subject><subject>Alloys</subject><subject>Budgeting</subject><subject>Deposition</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Geology</subject><subject>Massifs</subject><subject>Mathematical models</subject><subject>Mineralogy</subject><subject>Minerals</subject><subject>Mines and mineral resources</subject><subject>Ophiolites</subject><subject>Osmium</subject><subject>Platinum</subject><subject>Platinum base alloys</subject><subject>Rocks</subject><issn>1028-334X</issn><issn>1531-8354</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNqFUl1rFTEQXUTBWv0BvgWfKrg1s_lc38pF20JR0Aq-Lbm5yd6UTbImuw_1t_hjO5crCIqYQGaYOefMDJmmeQn0HIDxt1-Adpox_g3wUCrVo-YEBINWM8Efo4_p9pB_2jyr9Y5SzrnoT5qfm5yWYuoS0kjmyaBdYzuWvM4khuSKmYip1cXtZEZXiS85ErvHNyxhwUD2ZNk78jH82Kd7cmvGgIS0I5frFEhEavCVnH1e0TGv35HrOE_BYpmcUCwXYnOccw2HwBtS81osih4EsNzz5ok3U3UvftnT5uuH97ebq_bm0-X15uKmNZyzpe0E-K1QnkrKtHdGUwes16wTW7NzVOmug55ZKcE7prwSlgHzkmkjtdwBZ6fN2VF3Lvn76uoyxFCtmyaTXF7rAFKBED2j-v9Q2lEtJFcKoa_-gN7heAkHGXroeC-Uogg6P4JGM7khJJ_xNyzenYvB5uR8wPgFkxSgV3BoAI4EW3KtxflhLiGaco-lh8MqDH-tAnK6I6ciNo2u_O7k36QHci-2JA</recordid><startdate>20111101</startdate><enddate>20111101</enddate><creator>Malitch, K. 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N. ; Efimov, A. A. ; Badanina, I. Yu</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a443t-251fb57f06038fea80e1398325bade07822193c661fe37f75c313f638a686d143</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Age</topic><topic>Alloys</topic><topic>Budgeting</topic><topic>Deposition</topic><topic>Earth and Environmental Science</topic><topic>Earth Sciences</topic><topic>Geology</topic><topic>Massifs</topic><topic>Mathematical models</topic><topic>Mineralogy</topic><topic>Minerals</topic><topic>Mines and mineral resources</topic><topic>Ophiolites</topic><topic>Osmium</topic><topic>Platinum</topic><topic>Platinum base alloys</topic><topic>Rocks</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Malitch, K. N.</creatorcontrib><creatorcontrib>Efimov, A. A.</creatorcontrib><creatorcontrib>Badanina, I. 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N.</au><au>Efimov, A. A.</au><au>Badanina, I. Yu</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Contrasting platinum-group mineral assemblages from chromitites of the Nizhny Tagil and Guli massifs (Russia): Implications for composition, sources and age</atitle><jtitle>Doklady earth sciences</jtitle><stitle>Dokl. Earth Sc</stitle><date>2011-11-01</date><risdate>2011</risdate><volume>441</volume><issue>1</issue><spage>1514</spage><epage>1518</epage><pages>1514-1518</pages><issn>1028-334X</issn><eissn>1531-8354</eissn><abstract>The Nizhny Tagil and Guli clinopyroxenite-dunite massifs, located in the Middle Urals and Maimecha-Kotui Province, respectively, are associated with world-class platinum-group elements (PGE) placer deposits. Both massifs contain small bodies of schlieren to massive chromitite associated with dunite. The predominance of Pt-Fe alloys at Nizhny Tagil is consistnt with the whole-rock “M”-shaped mantle-normalized PGE pattern of the chromitite. In contrast, the preponderance of laurite and Os-Ir alloys at Guli is consistent with a negatively sloped PGE pattern, the latter being characteristic of ophiolite-type podiform chromitites. The ‘unradiogenic’
187
Os/
188
Os values obtained for both platinum-group minerals (PGM) and chromitite are indicative of a common near-to-chondritic source for the PGE and implies that the osmium isotope budget of chromitite is largely controlled by laurite and Os-rich alloy. Average model
187
Os/
188
Os ages calculated for the Nizhny Tagil and Guli massifs correspond to the late Riphean (e.g., 862 ± 48 Ma and 616 ± 8 Ma, respectively). The compositional and isotope-geochemical results provide new constraints on the temporal evolution of ultramafic rocks of the Uralian Platinum Belt and northern segment of the Siberian Platform.</abstract><cop>Dordrecht</cop><pub>SP MAIK Nauka/Interperiodica</pub><doi>10.1134/S1028334X11110067</doi><tpages>5</tpages></addata></record> |
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subjects | Age Alloys Budgeting Deposition Earth and Environmental Science Earth Sciences Geology Massifs Mathematical models Mineralogy Minerals Mines and mineral resources Ophiolites Osmium Platinum Platinum base alloys Rocks |
title | Contrasting platinum-group mineral assemblages from chromitites of the Nizhny Tagil and Guli massifs (Russia): Implications for composition, sources and age |
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