Rare earth and trace elements in igneous and metamorphic minerals of oceanic gabbros from the Mid-Atlantic Ridge
SIMS analyses have been carried out on clinopyroxenes, plagioclases and amphiboles of six gabbroic samples from Holes 921-924 of the Ocean Drilling Program Leg 153 sited in the MARK area of the Mid-Atlantic Ridge at the ridge-transform intersection, to investigate the rare earth, trace and volatile...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.667112 2024-09-15T18:24:29+00:00 Rare earth and trace elements in igneous and metamorphic minerals of oceanic gabbros from the Mid-Atlantic Ridge Cortesogno, Luciano Gaggero, Laura Zanetti, Alberto MEDIAN LATITUDE: 23.542300 * MEDIAN LONGITUDE: -45.026770 * SOUTH-BOUND LATITUDE: 23.540600 * WEST-BOUND LONGITUDE: -45.032100 * NORTH-BOUND LATITUDE: 23.552700 * EAST-BOUND LONGITUDE: -45.014400 * DATE/TIME START: 1993-12-20T00:00:00 * DATE/TIME END: 1994-12-29T00:00:00 2000 application/zip, 15 datasets https://doi.pangaea.de/10.1594/PANGAEA.667112 https://doi.org/10.1594/PANGAEA.667112 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.667112 https://doi.org/10.1594/PANGAEA.667112 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Cortesogno, Luciano; Gaggero, Laura; Zanetti, Alberto (2000): Rare earth and trace elements in igneous and high-temperature metamorphic minerals of oceanic gabbros (MARK area, Mid-Atlantic Ridge). Contributions to Mineralogy and Petrology, 139(4), 373-393, https://doi.org/10.1007/s004100000147 153-921 153-921B 153-922A 153-923A 153-924B COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg153 North Atlantic Ocean Ocean Drilling Program ODP dataset publication series 2000 ftpangaea https://doi.org/10.1594/PANGAEA.66711210.1007/s004100000147 2024-08-21T00:02:25Z SIMS analyses have been carried out on clinopyroxenes, plagioclases and amphiboles of six gabbroic samples from Holes 921-924 of the Ocean Drilling Program Leg 153 sited in the MARK area of the Mid-Atlantic Ridge at the ridge-transform intersection, to investigate the rare earth, trace and volatile element distribution in the lower ocean crust during igneous crystallization and higher grade metamorphic conditions. The metagabbros underwent granulite to subgreenschist facies conditions through three main tectono-metamorphic phases: (1) ductile regime (750 < T < 1000 °C and P = 0.3 GPa); (2) transitional regime (600 < T < 700 °C and P = 0.2 GPa); (3) brittle regime (350 < T < 600 °C and P < 0.2 GPa). Igneous clinopyroxenes show Cl-chondrite normalized patterns depleted in LREE, and nearly flat for HREE. The rare earth and trace element distributions in igneous clinopyroxenes and plagioclases indicate that these minerals act as REE reservoirs, and comprise the main contribution to the overall rock content. The abundances in igneous minerals reflect the degree of fractionation of the parent liquids. In metamorphic clinopyroxenes recrystallized in anhydrous assemblages, the REE and trace elements patterns mimic those of the primary ones. Conversely, clinopyroxerie re-equilibrated in amphibolebearing assemblages shows a significant increase in REE, Ti, Zr, Y and V, a negative Eu anomaly, and slight decreases in Sr and Ba. An overall increase of REE and some trace elements is evident in hydrous assemblages, with preferential partitioning in the amphibole. It shows high Ti (18196-22844 ppm), LREE depleted patterns and LaN/SmN = 0.10-0.33, LaN/YbN = 0.10-0.30. Amphiboles from granoblastic assemblages show homogeneous patterns with no or a positive anomaly for TiN and negative anomalies for SrN and ZrN. Volatiles in amphibole are low, with Cl/F < 1; H2O% is significantly lower than the stoichiometric ratio (1.33-1.53%). The composition of the clinopyroxene and amphibole recrystallized in low-strain ... Other/Unknown Material North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-45.032100,-45.014400,23.552700,23.540600) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
153-921 153-921B 153-922A 153-923A 153-924B COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg153 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
153-921 153-921B 153-922A 153-923A 153-924B COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg153 North Atlantic Ocean Ocean Drilling Program ODP Cortesogno, Luciano Gaggero, Laura Zanetti, Alberto Rare earth and trace elements in igneous and metamorphic minerals of oceanic gabbros from the Mid-Atlantic Ridge |
topic_facet |
153-921 153-921B 153-922A 153-923A 153-924B COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg153 North Atlantic Ocean Ocean Drilling Program ODP |
description |
SIMS analyses have been carried out on clinopyroxenes, plagioclases and amphiboles of six gabbroic samples from Holes 921-924 of the Ocean Drilling Program Leg 153 sited in the MARK area of the Mid-Atlantic Ridge at the ridge-transform intersection, to investigate the rare earth, trace and volatile element distribution in the lower ocean crust during igneous crystallization and higher grade metamorphic conditions. The metagabbros underwent granulite to subgreenschist facies conditions through three main tectono-metamorphic phases: (1) ductile regime (750 < T < 1000 °C and P = 0.3 GPa); (2) transitional regime (600 < T < 700 °C and P = 0.2 GPa); (3) brittle regime (350 < T < 600 °C and P < 0.2 GPa). Igneous clinopyroxenes show Cl-chondrite normalized patterns depleted in LREE, and nearly flat for HREE. The rare earth and trace element distributions in igneous clinopyroxenes and plagioclases indicate that these minerals act as REE reservoirs, and comprise the main contribution to the overall rock content. The abundances in igneous minerals reflect the degree of fractionation of the parent liquids. In metamorphic clinopyroxenes recrystallized in anhydrous assemblages, the REE and trace elements patterns mimic those of the primary ones. Conversely, clinopyroxerie re-equilibrated in amphibolebearing assemblages shows a significant increase in REE, Ti, Zr, Y and V, a negative Eu anomaly, and slight decreases in Sr and Ba. An overall increase of REE and some trace elements is evident in hydrous assemblages, with preferential partitioning in the amphibole. It shows high Ti (18196-22844 ppm), LREE depleted patterns and LaN/SmN = 0.10-0.33, LaN/YbN = 0.10-0.30. Amphiboles from granoblastic assemblages show homogeneous patterns with no or a positive anomaly for TiN and negative anomalies for SrN and ZrN. Volatiles in amphibole are low, with Cl/F < 1; H2O% is significantly lower than the stoichiometric ratio (1.33-1.53%). The composition of the clinopyroxene and amphibole recrystallized in low-strain ... |
format |
Other/Unknown Material |
author |
Cortesogno, Luciano Gaggero, Laura Zanetti, Alberto |
author_facet |
Cortesogno, Luciano Gaggero, Laura Zanetti, Alberto |
author_sort |
Cortesogno, Luciano |
title |
Rare earth and trace elements in igneous and metamorphic minerals of oceanic gabbros from the Mid-Atlantic Ridge |
title_short |
Rare earth and trace elements in igneous and metamorphic minerals of oceanic gabbros from the Mid-Atlantic Ridge |
title_full |
Rare earth and trace elements in igneous and metamorphic minerals of oceanic gabbros from the Mid-Atlantic Ridge |
title_fullStr |
Rare earth and trace elements in igneous and metamorphic minerals of oceanic gabbros from the Mid-Atlantic Ridge |
title_full_unstemmed |
Rare earth and trace elements in igneous and metamorphic minerals of oceanic gabbros from the Mid-Atlantic Ridge |
title_sort |
rare earth and trace elements in igneous and metamorphic minerals of oceanic gabbros from the mid-atlantic ridge |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.667112 https://doi.org/10.1594/PANGAEA.667112 |
op_coverage |
MEDIAN LATITUDE: 23.542300 * MEDIAN LONGITUDE: -45.026770 * SOUTH-BOUND LATITUDE: 23.540600 * WEST-BOUND LONGITUDE: -45.032100 * NORTH-BOUND LATITUDE: 23.552700 * EAST-BOUND LONGITUDE: -45.014400 * DATE/TIME START: 1993-12-20T00:00:00 * DATE/TIME END: 1994-12-29T00:00:00 |
long_lat |
ENVELOPE(-45.032100,-45.014400,23.552700,23.540600) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Cortesogno, Luciano; Gaggero, Laura; Zanetti, Alberto (2000): Rare earth and trace elements in igneous and high-temperature metamorphic minerals of oceanic gabbros (MARK area, Mid-Atlantic Ridge). Contributions to Mineralogy and Petrology, 139(4), 373-393, https://doi.org/10.1007/s004100000147 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.667112 https://doi.org/10.1594/PANGAEA.667112 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.66711210.1007/s004100000147 |
_version_ |
1810464840461844480 |