The fundamental role of island arc weathering in the oceanic Sr isotope budget

被引:151
作者
Allegre, Claude J.
Louvat, Pascale [1 ]
Gaillardet, Jerome
Meynadier, Laure
Rad, Setareh
Capmas, Francoise
机构
[1] IPGP, Lab Geochim & Cosmochim, CNRS, UMR 7154, F-75252 Paris 05, France
关键词
strontium isotopes; ocean water; arc volcanism; rivers; erosion; EAST PACIFIC RISE; WATER-ROCK INTERACTIONS; RIVER GEOCHEMISTRY; GLOBAL CLIMATE; EROSION RATES; INDIAN-OCEAN; DECCAN TRAPS; VENT FIELD; SEA-WATER; STRONTIUM;
D O I
10.1016/j.epsl.2010.01.019
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
We have re-assessed the Sr isotopic budget of the modern ocean taking into account the high erosion rates of volcanic islands, and especially of island arcs, emphasizing important contribution from subsurface weathering to global budgeting. We propose that intensive weathering on volcanic islands, island arcs and oceanic islands, coupled with large surface and subsurface water fluxes is the missing source of mantle-derived Sr-87/Sr-86 (0.703) in seawater Sr isotope balance. In our approach, it represents 60% of the actual mantle-like input of Sr to the oceans, the remaining 40% supplied by ridge-crest hydrothermal activity and sea-floor low-temperature alteration of basalts. The seawater Nd isotopic budget is consistent with this interpretation and explains well the regional contributions from ridge crest and island arc activity among the oceans. (c) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:51 / 56
页数:6
相关论文
共 54 条
[11]  
2
[12]  
CHAUDHURI S, 1986, CHEM GEOL, V59, P293, DOI 10.1016/0168-9622(86)90078-3
[13]   Chemical weathering in the Krishna Basin and Western Ghats of the Deccan Traps, India: Rates of basalt weathering and their controls [J].
Das, A ;
Krishnaswami, S ;
Sarin, MM ;
Pande, K .
GEOCHIMICA ET COSMOCHIMICA ACTA, 2005, 69 (08) :2067-2084
[14]   Imbalance in the oceanic strontium budget [J].
Davis, AC ;
Bickle, MJ ;
Teagle, DAH .
EARTH AND PLANETARY SCIENCE LETTERS, 2003, 211 (1-2) :173-187
[15]   Erosion of Deccan Traps determined by river geochemistry:: impact on the global climate and the 87Sr/86Sr ratio of seawater [J].
Dessert, C ;
Dupré, B ;
François, LM ;
Schott, J ;
Gaillardet, J ;
Chakrapani, G ;
Bajpai, S .
EARTH AND PLANETARY SCIENCE LETTERS, 2001, 188 (3-4) :459-474
[16]   Basalt weathering laws and the impact of basalt weathering on the global carbon cycle [J].
Dessert, C ;
Dupré, B ;
Gaillardet, J ;
François, LM ;
Allègre, CJ .
CHEMICAL GEOLOGY, 2003, 202 (3-4) :257-273
[17]   Fluxes of high- versus low-temperature water-rock interactions in aerial volcanic areas: Example from the Kamchatka Peninsula, Russia [J].
Dessert, Celine ;
Gaillardet, Jerome ;
Dupre, Bernard ;
Schott, Jacques ;
Pokrovsky, Oleg S. .
GEOCHIMICA ET COSMOCHIMICA ACTA, 2009, 73 (01) :148-169
[18]   SEAWATER SR ISOTOPE VARIATION OVER THE PAST 300 KYR AND INFLUENCE OF GLOBAL CLIMATE CYCLES [J].
DIA, AN ;
COHEN, AS ;
ONIONS, RK ;
SHACKLETON, NJ .
NATURE, 1992, 356 (6372) :786-788
[19]   NUMERICAL-MODELS FOR THE HYDROTHERMAL FIELD AT THE GALAPAGOS SPREADING CENTER [J].
FEHN, U ;
GREEN, KE ;
VONHERZEN, RP ;
CATHLES, LM .
JOURNAL OF GEOPHYSICAL RESEARCH, 1983, 88 (NB2) :1033-1048
[20]  
FOLIO JL, 2001, THESIS U REUNION ST