Chemical weathering on the North Island of New Zealand: CO2 consumption and fluxes of Sr and Os

We present Os and Sr isotope ratios and Os, Sr and major/trace element concentrations for river waters, spring waters and rains on the North Island of New Zealand. The Os and Sr data are used to examine whether the NINZ is a significant contributor of unradiogenic Os and Sr to the oceans. Major element chemistry is used to quantify weathering and CO2 consumption rates on the island to investigate relationships between these processes and Os and Sr behavior. Chemical erosion rates and CO2 consumption rates across the island range from 44 to 555 km−2 yr−1 and 95 to 1900 × 103 mol CO2 km−2 yr−1, respectively. Strontium flux for the island range from 177 to 16,100 mol km−2 yr−1 and the rivers have an average flux normalized 87Sr/86Sr ratio of 0.7075. In agreement with the previous studies these findings provide further evidence that weathering of arc terrains contributes a disproportionally large amount of Sr to the oceans and consumes very large amounts of CO2 annually compared to their areal extent. However, the 87Sr/86Sr from the NINZ is not particularly unradiogenic and it is likely not contributing significant amounts of unradiogenic Sr to the oceans. Repeated Os analyses and bottle leaching experiments revealed extensive and variable sample contamination by Os leaching from rigorously precleaned LDPE bottles. An upper bound on the flux of Os from NINZ can nevertheless be assessed and indicates that island arcs cannot provide significant amounts of unradiogenic Os to the oceans.

[1]  B. Peucker‐Ehrenbrink,et al.  Recommendations for Analysis of Dissolved Osmium in Seawater , 2013 .

[2]  Mukul Sharma,et al.  Osmium contamination of seawater samples stored in polyethylene bottles , 2012 .

[3]  E. Lajeunesse,et al.  Orography-driven chemical denudation in the Lesser Antilles: Evidence for a new feed-back mechanism stabilizing atmospheric CO2 , 2011, American Journal of Science.

[4]  L. Derry,et al.  Chemical weathering, river geochemistry and atmospheric carbon fluxes from volcanic and ultramafic regions on Luzon Island, the Philippines , 2011 .

[5]  K. Campbell,et al.  Miocene tubular concretions in East Coast Basin, New Zealand: Analogue for the subsurface plumbing of cold seeps , 2010 .

[6]  F. Blanckenburg,et al.  Long-term stability of global erosion rates and weathering during late-Cenozoic cooling , 2010, Nature.

[7]  B. Christenson,et al.  Sources of solutes and heat in low-enthalpy mineral waters and their relation to tectonic setting, New Zealand , 2010 .

[8]  P. Louvat,et al.  The fundamental role of island arc weathering in the oceanic Sr isotope budget , 2010 .

[9]  Brent M. Johnson,et al.  Stream geochemistry, chemical weathering and CO2 consumption potential of andesitic terrains, Dominica, Lesser Antilles , 2009 .

[10]  B. Peucker‐Ehrenbrink,et al.  Strontium isotopes in Chilean rivers: The flux of unradiogenic continental Sr to seawater , 2009 .

[11]  Cynthia Chen,et al.  High precision and high sensitivity measurements of osmium in seawater. , 2009, Analytical chemistry.

[12]  P. Sedwick,et al.  Anthropogenic osmium in rain and snow reveals global-scale atmospheric contamination , 2009, Proceedings of the National Academy of Sciences.

[13]  J. Ji,et al.  Evolution of the Cenozoic carbon cycle: The roles of tectonics and CO2 fertilization , 2009 .

[14]  D. Hicks,et al.  Geochemical fluxes and weathering of volcanic terrains on high standing islands: Taranaki and Manawatu-Wanganui regions of New Zealand , 2008 .

[15]  C. France‐Lanord,et al.  Sustained sulfide oxidation by physical erosion processes in the Mackenzie River basin: Climatic perspectives , 2007 .

[16]  P. Louvat,et al.  Hidden erosion on volcanic islands , 2007 .

[17]  D. Butterfield,et al.  Search for the proverbial mantle osmium sources to the oceans : Hydrothermal alteration of mid-ocean ridge basalt , 2007 .

[18]  Y. Muramatsu,et al.  Iodine as a tracer of organic material: 129I results from gas hydrate systems and fore arc fluids , 2007 .

[19]  B. Bostick,et al.  Lithologic controls on osmium isotopes in the Rio Orinoco , 2006 .

[20]  K. Telmer,et al.  The role of sulfur in chemical weathering and atmospheric CO2 fluxes: Evidence from major ions, δ13CDIC, and δ34SSO4 in rivers of the Canadian Cordillera , 2005 .

[21]  A. Jacobson,et al.  Strontium, hydrothermal systems and steady-state chemical weathering in active mountain belts [rapid communication] , 2005 .

[22]  S. Krishnaswami,et al.  Chemical weathering in the Krishna Basin and Western Ghats of the Deccan Traps, India : Rates of basalt weathering and their controls , 2005 .

[23]  D. Hicks,et al.  Chemical weathering in high‐sediment‐yielding watersheds, New Zealand , 2005 .

[24]  Y. Huh,et al.  Osmium isotope geochemistry in the Mackenzie River basin , 2004 .

[25]  L. François,et al.  Basalt weathering laws and the impact of basalt weathering on the global carbon cycle , 2003 .

[26]  A. Jacobson,et al.  Relationship between mechanical erosion and atmospheric CO2 consumption in the New Zealand Southern Alps , 2003 .

[27]  U. Fehn,et al.  Origin of iodine and 129I in volcanic and geothermal fluids from the North Island of New Zealand , 2003 .

[28]  M. Bickle,et al.  Imbalance in the oceanic strontium budget , 2003 .

[29]  M. Mottl,et al.  Evidence for basaltic Sr in midocean ridge-flank hydrothermal systems and implications for the global oceanic Sr isotope balance , 2001 .

[30]  Celine Dessert,et al.  Erosion of Deccan Traps determined by river geochemistry: impact on the global climate and the , 2001 .

[31]  L. Sloan,et al.  Trends, Rhythms, and Aberrations in Global Climate 65 Ma to Present , 2001, Science.

[32]  Peizhen Zhang,et al.  Increased sedimentation rates and grain sizes 2–4 Myr ago due to the influence of climate change on erosion rates , 2001, Nature.

[33]  B. Peucker‐Ehrenbrink,et al.  Sources and sinks of unradiogenic osmium runoff from Papua New Guinea , 2000 .

[34]  G. Wasserburg,et al.  Osmium isotopes in hydrothermal fluids from the Juan de Fuca Ridge , 2000 .

[35]  S. Levasseur,et al.  The osmium riverine flux and the oceanic mass balance of osmium , 1999 .

[36]  G. Wasserburg,et al.  Himalayan Uplift and Osmium isotopes in oceans and rivers , 1999 .

[37]  B. Dupré,et al.  Global silicate weathering and CO2 consumption rates deduced from the chemistry of large rivers , 1999 .

[38]  P. Louvat,et al.  Riverine erosion rates on Sao Miguel volcanic island, Azores archipelago , 1998 .

[39]  G. Wasserburg,et al.  Osmium in the rivers , 1997 .

[40]  P. Louvat,et al.  Present denudation rates on the island of Réunion determined by river geochemistry: Basalt weathering and mass budget between chemical and mechanical erosions , 1997 .

[41]  G. Wasserburg,et al.  The concentration and isotopic composition of osmium in the oceans , 1997 .

[42]  B. Peucker‐Ehrenbrink.  Accretion of extraterrestrial matter during the last 80 million years and its effect on the marine osmium isotope record , 1996 .

[43]  B. Dupré,et al.  Major and trace elements of river-borne material: The Congo Basin , 1996 .

[44]  K. H. Wedepohl,et al.  The Composition of the Continental Crust , 1995 .

[45]  B. Peucker‐Ehrenbrink,et al.  The marine187Os/186Os record of the past 80 million years , 1995 .

[46]  Yuji Sano,et al.  Isotopic composition of helium, and CO2 and CH4 contents in gases produced along the New Zealand part of a convergent plate boundary , 1993 .

[47]  J. Edmond.  Himalayan Tectonics, Weathering Processes, and the Strontium Isotope Record in Marine Limestones , 1992, Science.

[48]  K. Turekian,et al.  The record of sea water 187Os/186Os variation through the Cenozoic , 1992 .

[49]  M. Raymo,et al.  Tectonic forcing of late Cenozoic climate , 1992, Nature.

[50]  J. Edmond,et al.  The strontium isotope budget of the modern ocean , 1989 .

[51]  W. Hay,et al.  Mass/age distribution and composition of sediments on the ocean floor and the global rate of sediment subduction , 1988 .

[52]  W. Giggenbach.  Geothermal solute equilibria. Derivation of Na-K-Mg-Ca geoindicators , 1988 .

[53]  J. Birck.  Precision KRbSr isotopic analysis: Application to RbSr chronology , 1986 .

[54]  R. Garrels,et al.  The carbonate-silicate geochemical cycle and its effect on atmospheric carbon dioxide over the past 100 million years , 1983 .

[55]  R. Rudnick,et al.  Composition of the Continental Crust , 2014 .

[56]  J. Mauk,et al.  Geochemistry of the Early Miocene volcanic succession of Northland, New Zealand, and implications fo , 2011 .

[57]  O. Pokrovsky,et al.  Fluxes of high- versus low-temperature water–rock interactions in aerial volcanic areas: Example from the Kamchatka Peninsula, Russia , 2009 .

[58]  P. Louvat,et al.  River dissolved and solid loads in the Lesser Antilles: New insight into basalt weathering processes , 2006 .

[59]  S. Gíslason,et al.  The influence of weathering process on riverine osmium isotopes in a basaltic terrain , 2006 .

[60]  Chun-Houh Chen,et al.  Iron and Osmium Isotopes from Stony Micrometeorites and Implications for the Os Budget of the Ocean , 2005 .

[61]  A. Jacobson,et al.  Climatic and tectonic controls on chemical weathering in the New Zealand Southern Alps , 2003 .

[62]  A. Mckerchar,et al.  Quality of long flow records for New Zealand rivers , 1997 .

[63]  J. Edmond,et al.  Chemical Weathering Yields from Basement and Orogenic Terrains in Hot and Cold Climates , 1997 .

[64]  G. Hubbard,et al.  Geology of New Zealand , 1913 .