The chlorine isotope composition of Earth's mantle

被引:92
作者
Bonifacie, M. [1 ,2 ,3 ]
Jendrzejewski, N. [1 ,2 ]
Agrinier, P. [1 ,2 ]
Humler, E. [1 ,4 ]
Coleman, M. [5 ,6 ]
Javoy, M. [1 ,2 ]
机构
[1] Inst Phys Globe, CNRS INSU, UMR 7154, F-75251 Paris 05, France
[2] UPD, CNRS INSU, UMR 7154, F-75251 Paris, France
[3] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
[4] Univ Nantes, Lab Planetol & Geodynam, CNRS, UMR 6112, F-44322 Nantes 3, France
[5] Univ Reading, Sch Human & Environm Sci, Reading RG6 6AB, Berks, England
[6] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
关键词
D O I
10.1126/science.1150988
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Chlorine stable isotope compositions ( delta Cl-37) of 22 mid- ocean ridge basalts ( MORBs) correlate with Cl content. The high-delta Cl-37, Cl- rich basalts are highly contaminated by Cl- rich materials ( seawater, brines, or altered rocks). The low-delta(37) Cl, Cl- poor basalts approach the composition of uncontaminated, mantle- derived magmas. Thus, most or all oceanic lavas are contaminated to some extent during their emplacement. MORB- source mantle has delta(37) Cl <= -1.6 per mil (%), which is significantly lower than that of surface reservoirs (similar to 0 parts per thousand not equal). This isotopic difference between the surface and deep Earth results from net Cl isotopic fractionation ( associated with removal of Cl from the mantle and its return by subduction over Earth history) and/ or the addition ( to external reservoirs) of a late volatile supply that is Cl-37- enriched.
引用
收藏
页码:1518 / 1520
页数:3
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