Chlorine isotope evidence for crustal recycling into the Earth's mantle

被引：70
|
作者：
John, Timm [1 ,2 ,3 ,4 ]
Layne, Graham D. [5 ]
Haase, Karsten M. [6 ]
Barnes, Jaime D. [7 ]
机构：
[1] Univ Munster, Inst Mineral, D-48149 Munster, Germany
[2] Univ Oslo, Phys Geol Proc PGP, N-0316 Oslo, Norway
[3] Univ Kiel, Inst Geowissensch, D-24098 Kiel, Germany
[4] Univ Kiel, SFB 574, D-24098 Kiel, Germany
[5] Mem Univ Newfoundland, St John, NF A1B 3X5, Canada
[6] Univ Erlangen Nurnberg, GeoZentrum Nordbayern, D-91054 Erlangen, Germany
[7] Univ New Mexico, Dept Earth & Planetary Sci, Albuquerque, NM 87131 USA
来源：
EARTH AND PLANETARY SCIENCE LETTERS | 2010年 / 298卷 / 1-2期
基金：
美国国家科学基金会;
关键词：
chlorine isotopes; crustal recycling; SIMS; subduction zone; ocean island basalt; mantle chemistry; COMPLEX SW ECUADOR; TRACE-ELEMENT; OCEANIC-CRUST; SUBDUCTION ZONES; DETRITAL ZIRCONS; LAU BASIN; FLUIDS; CONSTRAINTS; SYSTEMATICS; RIDGE;
D O I：
10.1016/j.epsl.2010.07.039
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
Subduction of oceanic lithosphere is a key feature of terrestrial plate tectonics. However, the effect of this recycled crustal material on mantle composition is debated. Ocean island basalts (OIB) provide direct insights into the composition of Earth's mantle. The distinct composition of the HIMU (high (238)U/(204)Pb)- and EM (enriched mantle)-type OIB mantle sources may be due to either recycling of oceanic crust and sediment into the mantle or metasomatic processes within the mantle. Chlorine derived from seawater or crustal fluids potentially provides a tracer for recycled material. Previously reported delta(37)Cl values for mid-ocean ridge basalts (MORB) range from ca. -3.0 to near 0 parts per thousand. In contrast to MORB, we find a larger variation in OIB glasses representing HIMU- and EM-type mantle sources based on replicate SIMS analyses with delta(37)Cl values ranging from -1.6 to + 1.1 parts per thousand for HIMU-type and -0.4 to +2.9 parts per thousand for EM-type lavas. These delta(37)Cl values correlate positively with (87)Sr/(86)Sr ratios for both the HIMU- and EM-type samples. The negative delta(37)Cl values of some HIMU-type lavas overlap with those of altered oceanic lithosphere, which is assumed to be present in the HIMU source. The EM lavas have high (87)Sr/(86)Sr and primarily positive delta(37)Cl values. We hypothesize that subducting sediments may have developed high delta(37)Cl values by expelling (37)Cl-depleted pore fluids, thus accounting for the positive (37)delta Cl values recorded in the EM-type lavas. (C) 2010 Elsevier B.V. All rights reserved.
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收藏
页码：175 / 182
页数：8
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