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Fluids in subduction zones II

English title Fluids in subduction zones II
Applicant Pettke Thomas
Number 124370
Funding scheme SNSF Professorships
Research institution Institut für Geologie Universität Bern
Institution of higher education University of Berne - BE
Main discipline Geochemistry
Start/End 01.10.2009 - 30.09.2011
Approved amount 502'996.00
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Keywords (16)

Global geochemical cycling; Subduction zones; Chemical composition; Pb-Nd-Sr isotopes; LA-ICP-MS; Alps; Western Gneiss Region; Almirez; Subduction zones; Global element cycling; Laser ablation ICP-MS; Serpentinite; Fluid inclusions; Eclogite; Metasomatism; Diamond trap experiments

Lay Summary (English)

Lead
Lay summary

Subduction zones are the site of recycling of surface materials to deep earth.
Aqueous fluids drive the chemical exchange and trigger volcanic activity and earthquakes, may generate giant ore deposits, and refertilise deep mantle portions. Detailed in-situ measurements of element concentrations and Pb and Sr isotope ratios on natural samples and experimental products are employed to better constrain these fundamental chemical fluxes in subduction zones.

Analytical methods developments include the Pb and Sr isotope ratio analysis of individual fluid inclusions by laser ablation ICP-MS (LA-ICP-MS), which was applied to the giant Cu-Au-Mo deposit of Bingham. The novel data reveal that the source of ore metals lies in the lithospheric mantle metasomatized by subduction fluids some 1800 million years ago. These are among the first direct data that relate ancient subduction metasomatism with much younger formation of prominent ore metal anomalies.

Diamond trap experiments on the aqueous fluid chemistry in equilibrium with serpentinites at 120 - 180 km depth (i.e., in the slab beneath arc volcanism) document prominent compositional changes along with the coexisting residual mineral assemblage, demonstrating that the chemistry of fluids released from the down-going slab strongly evolves with progressive dehydration. Pathways of fluids escaping from serpentinites and invading overlying basaltic eclogites were identified in the Monviso, NW Italy, documenting serpentinite fluid metasomatism by use of vein mineral chemical signatures for the first time. At much lower depths in the forearc, ocean floor serpentinites (chrysotile/lizardite) begin to transform to antigorite serpentinite stable at higher pressure. This transformation goes along with a prominent trace element loss from the rock that may well account for chemically enriched fluids observed in serpentinite mud volcanoes at trenches.

Mantle rock fluid metasomatism at up to 200km depth is recorded by garnet-omphacite-phlogopite-veins, the detailed chemical investigation of which is currently under way. A comprehensive review of the LA-ICP-MS analytical techniques applied to fluid inclusions illustrates state of the art procedures to obtaining accurate compositional and isotope ratio measurements from individual fluid inclusions.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Halogen and noble gas systematics of ocean floor and ophiolitic serpentinites: implications for global volatile recycling
Kendrick M. A., Honda M., Pettke T., Scambelluri M., Phillips D. (2013), Halogen and noble gas systematics of ocean floor and ophiolitic serpentinites: implications for global volatile recycling, in Earth and Planetary Science Letters, 356, 86-96.
Cathodoluminescence properties and trace element signature of hydrothermal quartz: A fingerprint of growth dynamics
Gotte T, Pettke T, Ramseyer K, Koch-Muller M, Mullis J (2011), Cathodoluminescence properties and trace element signature of hydrothermal quartz: A fingerprint of growth dynamics, in AMERICAN MINERALOGIST, 96(5-6), 802-813.
Crystal Chemistry and Stability of "Li7La3Zr2O12" Garnet: A Fast Lithium-Ion Conductor
Geiger CA, Alekseev E, Lazic B, Fisch M, Armbruster T, Langner R, Fechtelkord M, Kim N, Pettke T, Weppner W (2011), Crystal Chemistry and Stability of "Li7La3Zr2O12" Garnet: A Fast Lithium-Ion Conductor, in INORGANIC CHEMISTRY, 50(3), 1089-1097.
Crystal-chemistry of mullite-type aluminoborates Al18B4O33 and Al5BO9: A stoichiometry puzzle
Fisch M, Armbruster T, Rentsch D, Libowitzky E, Pettke T (2011), Crystal-chemistry of mullite-type aluminoborates Al18B4O33 and Al5BO9: A stoichiometry puzzle, in JOURNAL OF SOLID STATE CHEMISTRY, 184(1), 70-80.
Fluids in the peridotite-water system up to 6 GPa and 800 degrees C: new experimental constrains on dehydration reactions
Dvir O, Pettke T, Fumagalli P, Kessel R (2011), Fluids in the peridotite-water system up to 6 GPa and 800 degrees C: new experimental constrains on dehydration reactions, in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY, 161(6), 829-844.
Gold and copper partitioning in magmatic-hydrothermal systems at 800 degrees C and 100 MPa
Frank MR, Simon AC, Pettke T, Candela PA, Piccoli PM (2011), Gold and copper partitioning in magmatic-hydrothermal systems at 800 degrees C and 100 MPa, in GEOCHIMICA ET COSMOCHIMICA ACTA, 75(9), 2470-2482.
Increasing Nd isotopic ratio of Asian dust indicates progressive uplift of the north Tibetan Plateau since the middle Miocene
Li GJ, Pettke T, Chen J (2011), Increasing Nd isotopic ratio of Asian dust indicates progressive uplift of the north Tibetan Plateau since the middle Miocene, in GEOLOGY, 39(3), 199-202.
Lead, Nd and Sr isotope records of pelagic dust: Source indication versus the effects of dust extraction procedures and authigenic mineral growth
Hyeong K, Kim J, Pettke T, Yoo CM, Hur SD (2011), Lead, Nd and Sr isotope records of pelagic dust: Source indication versus the effects of dust extraction procedures and authigenic mineral growth, in CHEMICAL GEOLOGY, 286(3-4), 240-251.
Significance of trace elements in syntaxial quartz cement, Haushi Group sandstones, Sultanate of Oman
Lehmann K, Pettke T, Ramseyer K (2011), Significance of trace elements in syntaxial quartz cement, Haushi Group sandstones, Sultanate of Oman, in CHEMICAL GEOLOGY, 280(1-2), 47-57.
Brine-rock interaction in the Athabasca basement (McArthur River U deposit, Canada): consequences for fluid chemistry and uranium uptake
Richard A, Pettke T, Cathelineau M, Boiron MC, Mercadier J, Cuney M, Derome D (2010), Brine-rock interaction in the Athabasca basement (McArthur River U deposit, Canada): consequences for fluid chemistry and uranium uptake, in TERRA NOVA, 22(4), 303-308.
Direct Analysis of Ore-Precipitating Fluids: Combined IR Microscopy and LA-ICP-MS Study of Fluid Inclusions in Opaque Ore Minerals
Kouzmanov K, Pettke T, Heinrich CA (2010), Direct Analysis of Ore-Precipitating Fluids: Combined IR Microscopy and LA-ICP-MS Study of Fluid Inclusions in Opaque Ore Minerals, in ECONOMIC GEOLOGY, 105(2), 351-373.
Highly Refractory Peridotites on Macquarie Island and the Case for Anciently Depleted Domains in the Earth's Mantle
Dijkstra AH, Sergeev DS, Spandler C, Pettke T, Meisel T, Cawood PA (2010), Highly Refractory Peridotites on Macquarie Island and the Case for Anciently Depleted Domains in the Earth's Mantle, in JOURNAL OF PETROLOGY, 51(1-2), 469-493.
Magnetic susceptibility as a tool to study deformed calcite with variable impurity content
Almqvist BSG, Herwegh M, Schmidt V, Pettke T, Hirt AM (2010), Magnetic susceptibility as a tool to study deformed calcite with variable impurity content, in GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 11(Article Nu), 1-15.
Plagioclase Peridotites in Ocean-Continent Transitions: Refertilized Mantle Domains Generated by Melt Stagnation in the Shallow Mantle Lithosphere
Muntener O, Manatschal G, Desmurs L, Pettke T (2010), Plagioclase Peridotites in Ocean-Continent Transitions: Refertilized Mantle Domains Generated by Melt Stagnation in the Shallow Mantle Lithosphere, in JOURNAL OF PETROLOGY, 51(1-2), 255-294.
Stable isotope profiles (Ca, O, C) through modern brachiopod shells of T. septentrionalis and G. vitreus: Implications for calcium isotope paleo-ocean chemistry
von Allmen K, Nagler TF, Pettke T, Hippler D, Griesshaber E, Logan A, Eisenhauer A, Samankassou E (2010), Stable isotope profiles (Ca, O, C) through modern brachiopod shells of T. septentrionalis and G. vitreus: Implications for calcium isotope paleo-ocean chemistry, in CHEMICAL GEOLOGY, 269(3-4), 210-219.
The Bingham Canyon Porphyry Cu-Mo-Au Deposit. III. Zoned Copper-Gold Ore Deposition by Magmatic Vapor Expansion
Landtwing MR, Furrer C, Redmond PB, Pettke T, Guillong M, Heinrich CA (2010), The Bingham Canyon Porphyry Cu-Mo-Au Deposit. III. Zoned Copper-Gold Ore Deposition by Magmatic Vapor Expansion, in ECONOMIC GEOLOGY, 105(1), 91-118.
U-Pb dating of calcite-aragonite layers in speleothems from hominin sites in South Africa by MC-ICP-MS
Pickering R, Kramers JD, Partridge T, Kodolanyi J, Pettke T (2010), U-Pb dating of calcite-aragonite layers in speleothems from hominin sites in South Africa by MC-ICP-MS, in QUATERNARY GEOCHRONOLOGY, 5(5), 544-558.
Construction of the granitoid crust of an island arc part I: geochronological and geochemical constraints from the plutonic Kohistan (NW Pakistan)
Jagoutz OE, Burg JP, Hussain S, Dawood H, Pettke T, Iizuka T, Maruyama S (2009), Construction of the granitoid crust of an island arc part I: geochronological and geochemical constraints from the plutonic Kohistan (NW Pakistan), in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY, 158(6), 739-755.
Is there an epidote-group mineral with Ca2Al2Cr3+Si3O12(OH) composition?
Nagashima M., Armbruster T., Langner R., Fechtelkord M., Kim N., Pettke T., Lahti S., Grobety B., Is there an epidote-group mineral with Ca2Al2Cr3+Si3O12(OH) composition?, in European Journal of Mineralogy.
Recent developments in element concentration and isotope ratio analysis of individual fluid inclusions by laser ablation single and multiple collector ICP–MS.
Pettke T., Oberli F., Audetat A., Guillong M., Simon A., Hanley J., Klemm L, Recent developments in element concentration and isotope ratio analysis of individual fluid inclusions by laser ablation single and multiple collector ICP–MS., in Ore Geology reviews.

Collaboration

Group / person Country
Types of collaboration
University of Townsville, QLD Australia (Oceania)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
DIPTERIS, University of Genova Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
University of Melbourne, VIC Australia (Oceania)
- in-depth/constructive exchanges on approaches, methods or results
The Hebrew University, Jerusalem Israel (Asia)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
ETH Zürich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
University of Nevada, Las Vegas (UNLV) United States of America (North America)
- Publication
Laurentian University, Sudbury, ON Canada (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Goldschmidt 2011 Conference Talk given at a conference Strontium isotope ratio analysis of individual fluid inclusions 14.08.2011 Prague, CZ, Czech Republic Pettke Thomas;
32nd International Gemmological Conference Talk given at a conference Laser ablation ICP-MS: technical aspects and capabilities of a versatile trace element microprobe 13.07.2011 Interlaken, CH, Switzerland Pettke Thomas;
ILP Task force IX - Workshop 2011, W. Alps Poster Internal and external fluid sources for eclogite-facies veins in the Monviso Meta-ophiolite, Western Alps: Implications for Fluid Flow in Subduction Zones 02.07.2011 Sampeyre, Piemonte, IT, Italy Pettke Thomas;
Goldschmidt 2010 Conference Talk given at a conference LA-(MC-)ICP-MS element and isotope ratio analysis of fluid inclusions in minerals 13.06.2010 Knoxville, TN; USA, United States of America Pettke Thomas;
PACROFI 2010 Talk given at a conference LA-ICP-MS element concentration and radiogenic isotope ratio analysis in individual fluid inclusions: New constraints on element mobility from the slab to the porphyry ore deposit and methodological progress 07.06.2010 Las Vegas, NV; USA, United States of America Pettke Thomas;


Communication with the public

Communication Title Media Place Year
Media relations: radio, television Gold Radio DRS 1; "Treffpunkt" German-speaking Switzerland 2011

Associated projects

Number Title Start Funding scheme
106569 Fluids in subduction zones 01.10.2005 SNSF Professorships
137686 The mineral and fluid chemistry of prograde serpentinite dehydration 01.08.2012 Project funding (Div. I-III)

Abstract

Aqueous fluids profoundly influence chemical and physical processes in subduction zones. Here, at convergent plate margins, commonly oceanic lithosphere (the slab) sinks (subducts) beneath continents, triggering many directly observable processes, including volcanic activity and earthquakes. Almost all these processes are directly or indirectly affected at some stage by a fluid phase. Properties of these liquids at depths exceeding a few tens of kilometres are only vaguely known, however, notably their chemical composition, how they move, how much mass flux they effect and over what scales in distance and time they operate. These issues probably represent the most serious impediment towards a more quantitative understanding of the chemical cycling in subduction zones.This follow-up proposal aims at further constraining the subduction cycle of hydrated oceanic mantle, serpentinites. The first aspect deals with the antigorite dehydration reaction, an essential snapshot during serpentinite subduction. Special emphasis is on the chemical and Pb-Sr-isotopic composition of the dehydration fluid captured in prograde, tiny fluid inclusions and its associated mineral assemblages (antigorite serpentinites and the devolatilization products, olivine - orthopyroxene - chlorite rocks) from Cerro del Almirez, Spain. This represents the only locality known to date where the antigorite-out reaction can be studied and sampled in the field. Bulk rock data will also be analyzed for Nd and possibly Hf isotopes in order to constrain the provenance of these serpentinites. A rigorous quantification of the chemical composition of the antigorite dehydration fluid can now be attacked in a much more comprehensive way, thanks to extensive LA-ICP-MS methods developments essential for the accurate in-situ analysis of ultra-trace element concentrations, achieved during the first stage of this project.The second aspect is the Sr-, Pb-, Nd- and possibly Hf-isotopic characterization of hydrated oceanic mantle, to characterizing the radiogenic isotope signatures that are eventually entering the subduction cycle. Modification of these radiogenic isotope signatures with progressive subduction are assessed through the analysis of antigorite-serpentinites and partly dehydrated olivine - orthopyroxene ± chlorite rocks. Only scattered such data are currently available, not allowing for a systematic assessment of the source tracer potential of these radiogenic isotope systems. Moreover, combination with extant major to trace element compositional data of the same samples (bulk rock and in-situ mineral data, in large parts available from the original project) will allow to addressing the combined chemical and isotope systematics of mantle hydration on the ocean floor and how these complementary signatures evolve with progressive subduction.The requested research will produce top-quality data efficiently and fill gaps in the chemical cycle of serpentinite subduction, including refertilization of mantle domains. The resulting comprehensive chemical and radiogenic isotope data set (original project plus follow-up proposal) is unprecedented and will allow to constraining fundamental issues on the relevance of hydrated mantle rocks in the fluid-mediated chemical cycling in subduction zones. It is generally accepted that hydrated mantle rocks essentially provide water to the subduction cycle. Which and how much of the soluble elements inventory actually originates from subducted serpentinites as opposed to subducted sediments will become much better quantified. Our views on fluid percolation paths and fluid compositional evolution will clarify. Addition of crustal components through subduction of largely devolatilized mantle rocks will better constrain deep mantle refertilization processes. Ancient subduction events most likely had similar effects. Ancient subduction-modified mantle domains can be identified through radiogenic isotope systematics and, given more quantitative constraints on modern subduction geochemical cycling, will allow assessing the effects of subduction on the evolution of Earth’s mantle and crust during the past >2 billion years.These fundamental research results will have profound implications on various key aspects of the global geochemical cycle and will inspire new initiatives in geosciences and possibly related research disciplines, well beyond the duration of this project.
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