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Pb and Hf isotope evidence for mantle enrichment processes and melt interactions in the lower crust and lithospheric mantle in Miocene orogenic volcanic rocks from Monte Arcuentu (Sardinia, Italy)
Miocene (ca. 18 Ma) subduction-related basalts and basaltic andesites from Monte Arcuentu, southern Sardinia, Italy, show a remarkable correlation between 87Sr/86Sr (from ∼0.705 to ∼0.711) over a small range of SiO2 (∼51-58 wt%) that contrasts with most other orogenic volcanic suites worldwide. New...
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| Published in: | Geosphere (Boulder, Colo.) Colo.), 2018-06, Vol.14 (3), p.926-950 |
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| creator | Kempton, Pamela D Downes, Hilary Lustrino, Michele |
| description | Miocene (ca. 18 Ma) subduction-related basalts and basaltic andesites from Monte Arcuentu, southern Sardinia, Italy, show a remarkable correlation between 87Sr/86Sr (from ∼0.705 to ∼0.711) over a small range of SiO2 (∼51-58 wt%) that contrasts with most other orogenic volcanic suites worldwide. New high-precision Pb and Hf isotope data help to constrain the petrogenesis of these rocks. The most primitive Monte Arcuentu rocks (MgO >8.5 wt%) were sourced from a mantle wedge metasomatized by melts derived from terrigenous sediment, likely derived from Archean terranes of northern Africa. This gave rise to magmas with high 87Sr/86Sr (0.705-0.709) and 207Pb/204Pb (15.65-15.67) with moderate εHf (-1 to +8) and εNd (-6 to +1), but it does not account for the full range of compositions observed. More evolved rocks (MgO |
| doi_str_mv | 10.1130/GES01584.1 |
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New high-precision Pb and Hf isotope data help to constrain the petrogenesis of these rocks. The most primitive Monte Arcuentu rocks (MgO >8.5 wt%) were sourced from a mantle wedge metasomatized by melts derived from terrigenous sediment, likely derived from Archean terranes of northern Africa. This gave rise to magmas with high 87Sr/86Sr (0.705-0.709) and 207Pb/204Pb (15.65-15.67) with moderate εHf (-1 to +8) and εNd (-6 to +1), but it does not account for the full range of compositions observed. More evolved rocks (MgO <8.5 wt%) have higher 87Sr/86Sr (up to 0.711) and 207Pb/204Pb (up to 15.68), with εHf and εNd as low as -8 and -9, respectively. Mixing calculations suggest that evolved rocks with low Rb/Ba and low 206Pb/204Pb interacted with lower crust similar compositionally to that exposed today in Calabria, Italy, which was formerly in crustal continuity with Sardinia. High Rb/Ba and high 206Pb/204Pb magmas interacted with lithospheric mantle similar to that sampled by Italian lamproites. Partial melting of lower crustal and upper mantle lithologies was facilitated by the rapid extension, and subsequent passive mantle upwelling, that occurred as Sardinia drifted away from the European plate during the Oligo-Miocene (ca. 32-15 Ma). Fractional crystallization under these PT conditions involved olivine + clinopyroxene with little or no plagioclase, such that differentiation proceeded without significant increase in SiO2. The Monte Arcuentu rocks provide insights into assimilation process in the lower crust and lithospheric mantle that may be obscured by upper crustal assimilation-fractional crystallization (AFC) processes in other orogenic suites.</description><identifier>ISSN: 1553-040X</identifier><identifier>EISSN: 1553-040X</identifier><identifier>DOI: 10.1130/GES01584.1</identifier><language>eng</language><publisher>Geological Society of America</publisher><subject>andesites ; basalts ; Cenozoic ; crust ; enrichment ; Europe ; fractional crystallization ; geochemistry ; Geophysics ; hafnium ; Hf-177/Hf-176 ; igneous and metamorphic rocks ; igneous rocks ; isotope ratios ; isotopes ; Italy ; lead ; magma contamination ; magmas ; mantle ; metals ; Miocene ; Monte Arcuentu ; Nd-144/Nd-143 ; neodymium ; Neogene ; Pb-206/Pb-204 ; Pb-207/Pb-204 ; Pb-208/Pb-204 ; Petrology ; plate tectonics ; radioactive isotopes ; rare earths ; Sardinia Italy ; solid Earth (tectonophysics) ; Southern Europe ; stable isotopes ; subduction ; Tertiary ; volcanic rocks</subject><ispartof>Geosphere (Boulder, Colo.), 2018-06, Vol.14 (3), p.926-950</ispartof><rights>GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld @Alexandria, VA @USA @United States. Reference includes data supplied by the Geological Society of America @Boulder, CO @USA @United States</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a326t-5ea9068e8ee7f40bf2bbcf08febe9f9df10d6ed50de90d9b6c1f9a45d40ac4853</citedby><cites>FETCH-LOGICAL-a326t-5ea9068e8ee7f40bf2bbcf08febe9f9df10d6ed50de90d9b6c1f9a45d40ac4853</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Kempton, Pamela D</creatorcontrib><creatorcontrib>Downes, Hilary</creatorcontrib><creatorcontrib>Lustrino, Michele</creatorcontrib><title>Pb and Hf isotope evidence for mantle enrichment processes and melt interactions in the lower crust and lithospheric mantle in Miocene orogenic volcanic rocks from Monte Arcuentu (Sardinia, Italy)</title><title>Geosphere (Boulder, Colo.)</title><description>Miocene (ca. 18 Ma) subduction-related basalts and basaltic andesites from Monte Arcuentu, southern Sardinia, Italy, show a remarkable correlation between 87Sr/86Sr (from ∼0.705 to ∼0.711) over a small range of SiO2 (∼51-58 wt%) that contrasts with most other orogenic volcanic suites worldwide. New high-precision Pb and Hf isotope data help to constrain the petrogenesis of these rocks. The most primitive Monte Arcuentu rocks (MgO >8.5 wt%) were sourced from a mantle wedge metasomatized by melts derived from terrigenous sediment, likely derived from Archean terranes of northern Africa. This gave rise to magmas with high 87Sr/86Sr (0.705-0.709) and 207Pb/204Pb (15.65-15.67) with moderate εHf (-1 to +8) and εNd (-6 to +1), but it does not account for the full range of compositions observed. More evolved rocks (MgO <8.5 wt%) have higher 87Sr/86Sr (up to 0.711) and 207Pb/204Pb (up to 15.68), with εHf and εNd as low as -8 and -9, respectively. Mixing calculations suggest that evolved rocks with low Rb/Ba and low 206Pb/204Pb interacted with lower crust similar compositionally to that exposed today in Calabria, Italy, which was formerly in crustal continuity with Sardinia. High Rb/Ba and high 206Pb/204Pb magmas interacted with lithospheric mantle similar to that sampled by Italian lamproites. Partial melting of lower crustal and upper mantle lithologies was facilitated by the rapid extension, and subsequent passive mantle upwelling, that occurred as Sardinia drifted away from the European plate during the Oligo-Miocene (ca. 32-15 Ma). Fractional crystallization under these PT conditions involved olivine + clinopyroxene with little or no plagioclase, such that differentiation proceeded without significant increase in SiO2. The Monte Arcuentu rocks provide insights into assimilation process in the lower crust and lithospheric mantle that may be obscured by upper crustal assimilation-fractional crystallization (AFC) processes in other orogenic suites.</description><subject>andesites</subject><subject>basalts</subject><subject>Cenozoic</subject><subject>crust</subject><subject>enrichment</subject><subject>Europe</subject><subject>fractional crystallization</subject><subject>geochemistry</subject><subject>Geophysics</subject><subject>hafnium</subject><subject>Hf-177/Hf-176</subject><subject>igneous and metamorphic rocks</subject><subject>igneous rocks</subject><subject>isotope ratios</subject><subject>isotopes</subject><subject>Italy</subject><subject>lead</subject><subject>magma contamination</subject><subject>magmas</subject><subject>mantle</subject><subject>metals</subject><subject>Miocene</subject><subject>Monte Arcuentu</subject><subject>Nd-144/Nd-143</subject><subject>neodymium</subject><subject>Neogene</subject><subject>Pb-206/Pb-204</subject><subject>Pb-207/Pb-204</subject><subject>Pb-208/Pb-204</subject><subject>Petrology</subject><subject>plate tectonics</subject><subject>radioactive isotopes</subject><subject>rare earths</subject><subject>Sardinia Italy</subject><subject>solid Earth (tectonophysics)</subject><subject>Southern Europe</subject><subject>stable isotopes</subject><subject>subduction</subject><subject>Tertiary</subject><subject>volcanic rocks</subject><issn>1553-040X</issn><issn>1553-040X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNpNUMtOwzAQjBBIPC98wR55FdZNXJJjVZWHBAKpIHGLHHtNDYld2W4r_o8Pwy1U4rSzu7Ozo8myY4aXjOV4dTueIONlccm2sj3Ged7DAt-2_-HdbD-ED8S84nl_L_t-bkBYBXcaTHDRzQhoYRRZSaCdh07Y2KaZ9UZOO7IRZt5JCoHC-q6jNoKxkbyQ0TgbUgNxStC6JXmQfh7imtiaOHVhNqUktFFN1EeT1CyB8-6dbFotXCvFCqQ3nwG0dx08uvQAhl7Ok4E5nEyEV8YacQH3UbRfp4fZjhZtoKO_epC93oxfRne9h6fb-9HwoSfy_iD2OIkKByWVRNe6wEb3m0ZqLDU1VOlKaYZqQIqjogpV1Qwk05UouCpQyKLk-UF29qsrvQvBk65n3nTCf9UM61X-9Sb_miXy-S_5nVyQZpXo0vlW1R9u7m2yWfeRlTVyXmGZ_wDeBI0z</recordid><startdate>20180601</startdate><enddate>20180601</enddate><creator>Kempton, Pamela D</creator><creator>Downes, Hilary</creator><creator>Lustrino, Michele</creator><general>Geological Society of America</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>20180601</creationdate><title>Pb and Hf isotope evidence for mantle enrichment processes and melt interactions in the lower crust and lithospheric mantle in Miocene orogenic volcanic rocks from Monte Arcuentu (Sardinia, Italy)</title><author>Kempton, Pamela D ; Downes, Hilary ; Lustrino, Michele</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a326t-5ea9068e8ee7f40bf2bbcf08febe9f9df10d6ed50de90d9b6c1f9a45d40ac4853</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>andesites</topic><topic>basalts</topic><topic>Cenozoic</topic><topic>crust</topic><topic>enrichment</topic><topic>Europe</topic><topic>fractional crystallization</topic><topic>geochemistry</topic><topic>Geophysics</topic><topic>hafnium</topic><topic>Hf-177/Hf-176</topic><topic>igneous and metamorphic rocks</topic><topic>igneous rocks</topic><topic>isotope ratios</topic><topic>isotopes</topic><topic>Italy</topic><topic>lead</topic><topic>magma contamination</topic><topic>magmas</topic><topic>mantle</topic><topic>metals</topic><topic>Miocene</topic><topic>Monte Arcuentu</topic><topic>Nd-144/Nd-143</topic><topic>neodymium</topic><topic>Neogene</topic><topic>Pb-206/Pb-204</topic><topic>Pb-207/Pb-204</topic><topic>Pb-208/Pb-204</topic><topic>Petrology</topic><topic>plate tectonics</topic><topic>radioactive isotopes</topic><topic>rare earths</topic><topic>Sardinia Italy</topic><topic>solid Earth (tectonophysics)</topic><topic>Southern Europe</topic><topic>stable isotopes</topic><topic>subduction</topic><topic>Tertiary</topic><topic>volcanic rocks</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kempton, Pamela D</creatorcontrib><creatorcontrib>Downes, Hilary</creatorcontrib><creatorcontrib>Lustrino, Michele</creatorcontrib><collection>CrossRef</collection><jtitle>Geosphere (Boulder, Colo.)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kempton, Pamela D</au><au>Downes, Hilary</au><au>Lustrino, Michele</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Pb and Hf isotope evidence for mantle enrichment processes and melt interactions in the lower crust and lithospheric mantle in Miocene orogenic volcanic rocks from Monte Arcuentu (Sardinia, Italy)</atitle><jtitle>Geosphere (Boulder, Colo.)</jtitle><date>2018-06-01</date><risdate>2018</risdate><volume>14</volume><issue>3</issue><spage>926</spage><epage>950</epage><pages>926-950</pages><issn>1553-040X</issn><eissn>1553-040X</eissn><abstract>Miocene (ca. 18 Ma) subduction-related basalts and basaltic andesites from Monte Arcuentu, southern Sardinia, Italy, show a remarkable correlation between 87Sr/86Sr (from ∼0.705 to ∼0.711) over a small range of SiO2 (∼51-58 wt%) that contrasts with most other orogenic volcanic suites worldwide. New high-precision Pb and Hf isotope data help to constrain the petrogenesis of these rocks. The most primitive Monte Arcuentu rocks (MgO >8.5 wt%) were sourced from a mantle wedge metasomatized by melts derived from terrigenous sediment, likely derived from Archean terranes of northern Africa. This gave rise to magmas with high 87Sr/86Sr (0.705-0.709) and 207Pb/204Pb (15.65-15.67) with moderate εHf (-1 to +8) and εNd (-6 to +1), but it does not account for the full range of compositions observed. More evolved rocks (MgO <8.5 wt%) have higher 87Sr/86Sr (up to 0.711) and 207Pb/204Pb (up to 15.68), with εHf and εNd as low as -8 and -9, respectively. Mixing calculations suggest that evolved rocks with low Rb/Ba and low 206Pb/204Pb interacted with lower crust similar compositionally to that exposed today in Calabria, Italy, which was formerly in crustal continuity with Sardinia. High Rb/Ba and high 206Pb/204Pb magmas interacted with lithospheric mantle similar to that sampled by Italian lamproites. Partial melting of lower crustal and upper mantle lithologies was facilitated by the rapid extension, and subsequent passive mantle upwelling, that occurred as Sardinia drifted away from the European plate during the Oligo-Miocene (ca. 32-15 Ma). Fractional crystallization under these PT conditions involved olivine + clinopyroxene with little or no plagioclase, such that differentiation proceeded without significant increase in SiO2. The Monte Arcuentu rocks provide insights into assimilation process in the lower crust and lithospheric mantle that may be obscured by upper crustal assimilation-fractional crystallization (AFC) processes in other orogenic suites.</abstract><pub>Geological Society of America</pub><doi>10.1130/GES01584.1</doi><tpages>25</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | andesites basalts Cenozoic crust enrichment Europe fractional crystallization geochemistry Geophysics hafnium Hf-177/Hf-176 igneous and metamorphic rocks igneous rocks isotope ratios isotopes Italy lead magma contamination magmas mantle metals Miocene Monte Arcuentu Nd-144/Nd-143 neodymium Neogene Pb-206/Pb-204 Pb-207/Pb-204 Pb-208/Pb-204 Petrology plate tectonics radioactive isotopes rare earths Sardinia Italy solid Earth (tectonophysics) Southern Europe stable isotopes subduction Tertiary volcanic rocks |
| title | Pb and Hf isotope evidence for mantle enrichment processes and melt interactions in the lower crust and lithospheric mantle in Miocene orogenic volcanic rocks from Monte Arcuentu (Sardinia, Italy) |
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