Cryptic Variations in Abyssal Peridotite Compositions: Evidence for Shallow-level Melt Infiltration in the Oceanic Lithosphere
Ranges in clinopyroxene trace element contents of 2–3 orders of magnitude occur over
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| Veröffentlicht in: | Journal of petrology 2010-01, Vol.51 (1-2), p.395-423 |
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| container_title | Journal of petrology |
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| creator | Warren, J. M. Shimizu, N. |
| description | Ranges in clinopyroxene trace element contents of 2–3 orders of magnitude occur over |
| doi_str_mv | 10.1093/petrology/egp096 |
| format | Article |
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M. ; Shimizu, N.</creator><creatorcontrib>Warren, J. M. ; Shimizu, N.</creatorcontrib><description>Ranges in clinopyroxene trace element contents of 2–3 orders of magnitude occur over <2 cm distance in peridotite samples from the Atlantis II Fracture Zone on the Southwest Indian Ridge. This represents the smallest length-scale at which clinopyroxene trace element concentrations have been observed to vary in abyssal peridotites. Because of the absence of any accompanying veins or other macroscopic features of melt–rock interaction, these peridotites are interpreted as being the result of cryptic metasomatism by a low-volume melt. The small length-scale of the variations, including porphyroclastic clinopyroxene grains of 2 mm diameter with an order of magnitude variation in light rare earth elements, precludes an ancient origin for these anomalies. Calculation of diffusive homogenization time-scales suggests that for the trace element variations to be preserved, metasomatism occurred in the oceanic lithospheric mantle at 1000–1200°C and 10–20 km depth. This observation provides constraints for the on-axis thickness of the lithospheric mantle at an ultraslow-spreading ridge. Trace amounts of plagioclase are present in at least two of the metasomatized samples. Textural and trace element observations indicate that it formed following the trace element metasomatism, indicating that the mantle can be infiltrated multiple times by melt during the final stages of uplift at the ridge axis. The peridotites in this study are from two oceanic core complexes on the Atlantis II Fracture Zone. Our observations of multiple late-stage metasomatic events in the lithospheric mantle agree with current models and observations of melt intrusion into the mantle during oceanic core complex formation. These observations also indicate that heterogeneous lithospheric mantle can be created at ultraslow-spreading ridges.</description><identifier>ISSN: 0022-3530</identifier><identifier>EISSN: 1460-2415</identifier><identifier>DOI: 10.1093/petrology/egp096</identifier><language>eng</language><publisher>Oxford University Press</publisher><subject>ion-microprobe ; melt–rock reaction ; metasomatism ; mid-ocean ridge ; oceanic lithosphere ; peridotite ; REE ; trace element</subject><ispartof>Journal of petrology, 2010-01, Vol.51 (1-2), p.395-423</ispartof><rights>The Author 2010. Published by Oxford University Press. All rights reserved. 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M.</creatorcontrib><creatorcontrib>Shimizu, N.</creatorcontrib><title>Cryptic Variations in Abyssal Peridotite Compositions: Evidence for Shallow-level Melt Infiltration in the Oceanic Lithosphere</title><title>Journal of petrology</title><description>Ranges in clinopyroxene trace element contents of 2–3 orders of magnitude occur over <2 cm distance in peridotite samples from the Atlantis II Fracture Zone on the Southwest Indian Ridge. This represents the smallest length-scale at which clinopyroxene trace element concentrations have been observed to vary in abyssal peridotites. Because of the absence of any accompanying veins or other macroscopic features of melt–rock interaction, these peridotites are interpreted as being the result of cryptic metasomatism by a low-volume melt. The small length-scale of the variations, including porphyroclastic clinopyroxene grains of 2 mm diameter with an order of magnitude variation in light rare earth elements, precludes an ancient origin for these anomalies. Calculation of diffusive homogenization time-scales suggests that for the trace element variations to be preserved, metasomatism occurred in the oceanic lithospheric mantle at 1000–1200°C and 10–20 km depth. This observation provides constraints for the on-axis thickness of the lithospheric mantle at an ultraslow-spreading ridge. Trace amounts of plagioclase are present in at least two of the metasomatized samples. Textural and trace element observations indicate that it formed following the trace element metasomatism, indicating that the mantle can be infiltrated multiple times by melt during the final stages of uplift at the ridge axis. The peridotites in this study are from two oceanic core complexes on the Atlantis II Fracture Zone. Our observations of multiple late-stage metasomatic events in the lithospheric mantle agree with current models and observations of melt intrusion into the mantle during oceanic core complex formation. These observations also indicate that heterogeneous lithospheric mantle can be created at ultraslow-spreading ridges.</description><subject>ion-microprobe</subject><subject>melt–rock reaction</subject><subject>metasomatism</subject><subject>mid-ocean ridge</subject><subject>oceanic lithosphere</subject><subject>peridotite</subject><subject>REE</subject><subject>trace element</subject><issn>0022-3530</issn><issn>1460-2415</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><recordid>eNqNkDtPHDEUha0oSNkAfUp3KaIJ1_PwjNPBagNIyxuiKI3l8VyzTrzjwfYC2_DbWRhEnepKR9_5rnQI-cLgOwNR7A2Ygnf-dr2HtwMI_oFMWMkhy0tWfSQTgDzPiqqAT-RzjH8B2CaHCXmahvWQrKa_VLAqWd9Hanu6365jVI6eY7CdTzYhnfrl4KN9RX7Q2b3tsNdIjQ_0aqGc8w-Zw3t09ARdose9sS6FV-OLMC2QnmlU_ebV3KaFj8MCA-6QLaNcxN23u01ufs6up0fZ_OzweLo_z1TZQMoENjWIKoeWNwJN3UGpG96WGg1XAG3dMdFUqjXamE4Yxo0QpjSFMG1TacRim3wdvUPwdyuMSS5t1Oic6tGvoqzLkues4NWGhJHUwccY0Mgh2KUKa8lAviwt35eW49Kbyrex4lfD_9DZSNuY8PGdV-Gf5HVRV_Lo9x95enByeXFwfSWheAbqopeI</recordid><startdate>20100101</startdate><enddate>20100101</enddate><creator>Warren, J. M.</creator><creator>Shimizu, N.</creator><general>Oxford University Press</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope></search><sort><creationdate>20100101</creationdate><title>Cryptic Variations in Abyssal Peridotite Compositions: Evidence for Shallow-level Melt Infiltration in the Oceanic Lithosphere</title><author>Warren, J. M. ; Shimizu, N.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a480t-9e8709520b689ef7d04c86b4cef6a00b7d1985abfcffd9f16f99f4f39fb85cee3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>ion-microprobe</topic><topic>melt–rock reaction</topic><topic>metasomatism</topic><topic>mid-ocean ridge</topic><topic>oceanic lithosphere</topic><topic>peridotite</topic><topic>REE</topic><topic>trace element</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Warren, J. M.</creatorcontrib><creatorcontrib>Shimizu, N.</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Journal of petrology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Warren, J. M.</au><au>Shimizu, N.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Cryptic Variations in Abyssal Peridotite Compositions: Evidence for Shallow-level Melt Infiltration in the Oceanic Lithosphere</atitle><jtitle>Journal of petrology</jtitle><date>2010-01-01</date><risdate>2010</risdate><volume>51</volume><issue>1-2</issue><spage>395</spage><epage>423</epage><pages>395-423</pages><issn>0022-3530</issn><eissn>1460-2415</eissn><abstract>Ranges in clinopyroxene trace element contents of 2–3 orders of magnitude occur over <2 cm distance in peridotite samples from the Atlantis II Fracture Zone on the Southwest Indian Ridge. This represents the smallest length-scale at which clinopyroxene trace element concentrations have been observed to vary in abyssal peridotites. Because of the absence of any accompanying veins or other macroscopic features of melt–rock interaction, these peridotites are interpreted as being the result of cryptic metasomatism by a low-volume melt. The small length-scale of the variations, including porphyroclastic clinopyroxene grains of 2 mm diameter with an order of magnitude variation in light rare earth elements, precludes an ancient origin for these anomalies. Calculation of diffusive homogenization time-scales suggests that for the trace element variations to be preserved, metasomatism occurred in the oceanic lithospheric mantle at 1000–1200°C and 10–20 km depth. This observation provides constraints for the on-axis thickness of the lithospheric mantle at an ultraslow-spreading ridge. Trace amounts of plagioclase are present in at least two of the metasomatized samples. Textural and trace element observations indicate that it formed following the trace element metasomatism, indicating that the mantle can be infiltrated multiple times by melt during the final stages of uplift at the ridge axis. The peridotites in this study are from two oceanic core complexes on the Atlantis II Fracture Zone. Our observations of multiple late-stage metasomatic events in the lithospheric mantle agree with current models and observations of melt intrusion into the mantle during oceanic core complex formation. These observations also indicate that heterogeneous lithospheric mantle can be created at ultraslow-spreading ridges.</abstract><pub>Oxford University Press</pub><doi>10.1093/petrology/egp096</doi><tpages>29</tpages><oa>free_for_read</oa></addata></record> |
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| source | Oxford University Press Journals All Titles (1996-Current); EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection; Free Full-Text Journals in Chemistry |
| subjects | ion-microprobe melt–rock reaction metasomatism mid-ocean ridge oceanic lithosphere peridotite REE trace element |
| title | Cryptic Variations in Abyssal Peridotite Compositions: Evidence for Shallow-level Melt Infiltration in the Oceanic Lithosphere |
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