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  • 1
    Monograph available for loan
    Monograph available for loan
    Orogenic andesites and crustal growth (2014)
    London : The Geological Society
    Associated volumes
    Details Availability
    Call number: 9/M 07.0421(385)
    In: Geological Society special publication
    Description / Table of Contents: Orogenic andesites have long intrigued scientists because of their remarkable compositional similarities to the continental crust. The significance of orogenic andesites as proxies to continental crust formation has been recognized for over 30 years, but no consensus model of andesite genesis exists. Much of the controversy revolves around whether orogenic andesites are primary melts of slab and mantle materials, or instead evolve from basaltic mantle melts at shallower crustal levels. In three sections, this book provides an overview of andesite genesis at convergent margins that focuses on the slab mantle interaction, crustal processing and andesite evolution through the life of volcanic arcs. Without favouring a particular view, the books aims to engender cross-fertilization and discussion that will smooth the pathway towards a holistic communal model of andesite petrogenesis and its role within the broader geochemical cycles of the Earth.
    Type of Medium: Monograph available for loan
    Pages: ix, 414 S. : z.T. farb. Ill., graph. Darst., Kt.
    ISBN: 9781862393691
    Series Statement: Special Publication / Geological Society 385
    URL: http://sp.lyellcollection.org/content/385/1
    Classification:
    Lithosphere
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    The Role of Volatiles in the Genesis, Evolution and Eruption of Arc Magmas (2015)
    London : The Geological Society
    Associated volumes
    Details Availability
    Call number: 9/M 07.0421(410)
    In: Geological Society special publication
    Description / Table of Contents: The subduction zone volatile cycle is key to understanding the petrogenesis, transport, storage and eruption of arc magmas. Volatiles control the flux of slab components into the mantle wedge, are responsible for melt generation through lowering the solidi of mantle materials and influence the crystallizing phase assemblages in the overriding crust. Further, the rates and extents of degassing during magma storage and decompression affect magma rheology, ultimately control eruption style and have consequences for the environmental impact of explosive arc volcanism. This book highlights recent progress in constraining the role of volatiles in magmatic processes. Individual book sections are devoted to tracing volatiles from the subducting slab to the overriding crust, their role in subvolcanic processes and eruption triggering, as well as magmatic-hydrothermal systems and volcanic degassing. For the first time, all aspects of the overarching theme of volatile cycling are covered in detail within a single volume.
    Type of Medium: Monograph available for loan
    Pages: 292 S.
    ISBN: 9781862396890
    Series Statement: Geological Society special publication 410
    URL: http://sp.lyellcollection.org/content/410/1
    Classification:
    Petrology, Petrography
    Location: Reading room
    Branch Library: GFZ Library
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  • 3
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    (Table 5) Preliminary chemical on board analyses of rock samples during Sonne cruise SO57
    PANGAEA
    In:  Geologisch-Paläontologisches Institut, Christian-Albrechts-Universität, Kiel
    Details
    Publication Date: 2023-05-12
    Keywords: Aluminium oxide; Calcium oxide; Date/Time of event; DEPTH, sediment/rock; Dredge; DRG; Elevation of event; Event label; GIK17107-1; GIK17110-1; GIK17113-1; GIK17114-1; GIK17120-1; GIK17123-1; GIK17126-1; GIK17127-1; GIK17130-1; GIK17131-1; GIK17132-1; GIK17134-1; GIK17142-1; GIK17143-1; GIK17151-1; GIK17153-1; Iron oxide, FeO; Latitude of event; Longitude of event; Magnesium oxide; Manganese oxide; Mariana arc/Philippine Basin; MARIANA I; MS; Multisonde; Sample code/label; Sample type; Silicon dioxide; SO57; Sonne; Television-Grab; Titanium dioxide; TVG
    Type: Dataset
    Format: text/tab-separated-values, 252 data points
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  • 4
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    (Tab 4) Granulometry of surface sediments in tenth phi classes on core-top sediments during SONNE cruise SO202 (INOPEX) (2014)
    PANGAEA
    Details
    Publication Date: 2023-10-05
    Keywords: Beckman Coulter Laser diffraction particle size analyzer LS 13 320; DEPTH, sediment/rock; Elevation of event; Event label; INOPEX; Latitude of event; Longitude of event; MUC; MultiCorer; North Pacific Ocean; Size fraction 0.397-0.370 µm, 11.3-11.4 phi; Size fraction 0.45-0.41 µm, 11.1-11.3 phi; Size fraction 0.488-0.456 µm, 11.0-11.1 phi; Size fraction 0.523-0.488 µm, 10.9-11.0 phi; Size fraction 0.6-0.54 µm, 10.7-10.9 phi; Size fraction 0.644-0.601 µm, 10.6-10.7 phi; Size fraction 0.72-0.66 µm, 10.4-10.6 phi; Size fraction 0.793-0.740 µm, 10.3-10.4 phi; Size fraction 0.850-0.793 µm, 10.2-10.3 phi; Size fraction 0.95-0.87 µm, 10.0-10.2 phi; Size fraction 1.047-0.977 µm, 9.9-10.0 phi; Size fraction 1.122-1.047 µm, 9.8-9.9 phi; Size fraction 1.26-1.15 µm, 9.6-9.8 phi; Size fraction 1.381-1.289 µm, 9.5-9.6 phi; Size fraction 1.480-1.381 µm, 9.4-9.5 phi; Size fraction 1.67-1.52 µm, 9.2-9.4 phi; Size fraction 1.822-1.700 µm, 9.1-9.2 phi; Size fraction 1.953-1.822 µm, 9.0-9.1 phi; Size fraction 10.78-9.82 µm, 6.5-6.7 phi; Size fraction 101.532-94.732 µm, 3.3-3.4 phi; Size fraction 1041.05-948.34 µm, (-0.1)-0.1 phi; Size fraction 108.819-101.532 µm, 3.2-3.3 phi; Size fraction 11.842-11.049 µm, 6.4-6.5 phi; Size fraction 1148.698-1071.773 µm, (-0.2) to (-0.1) phi; Size fraction 12.691-11.842 µm, 6.3-6.4 phi; Size fraction 121.84-110.99 µm, 3.0-3.2 phi; Size fraction 1231.144-1148.698 µm, (-0.3) to (-0.2) phi; Size fraction 133.972-125.000 µm, 2.9-3.0 phi; Size fraction 1377.2-1254.55 µm, (-0.5) to (-0.3) phi; Size fraction 14.26-12.99 µm, 6.1-6.3 phi; Size fraction 143.587-133.972 µm, 2.8-2.9 phi; Size fraction 15.625-14.579 µm, 6.0-6.1 phi; Size fraction 1515.717-1414.214 µm, (-0.6) to (-0.5) phi; Size fraction 16.746-15.625 µm, 5.9-6.0 phi; Size fraction 161.18-146.82 µm, 2.6-2.8 phi; Size fraction 1624.505-1515.717 µm, (-0.7) to (-0.6) phi; Size fraction 176.777-164.938 µm, 2.5-2.6 phi; Size fraction 18.86-17.18 µm, 5.7-5.9 phi; Size fraction 1821.89-1659.64 µm, (-0.9) to (-0.7) phi; Size fraction 189.465-176.777 µm, 2.4-2.5 phi; Size fraction 2.21-2.01 µm, 8.8-9.0 phi; Size fraction 2.405-2.244 µm, 8.7-8.8 phi; Size fraction 2.577-2.405 µm, 8.6-8.7 phi; Size fraction 2.92-2.66 µm, 8.4-8.6 phi; Size fraction 20.617-19.237 µm, 5.6-5.7 phi; Size fraction 2000.000-1866.066 µm, (-1.0) to (-0.9) phi; Size fraction 213.22-194.23 µm, 2.2-2.4 phi; Size fraction 22.097-20.617 µm, 5.5-5.6 phi; Size fraction 233.258-217.638 µm, 2.1-2.2 phi; Size fraction 24.95-22.73 µm, 5.3-5.5 phi; Size fraction 250.000-233.258 µm, 2.0-2.1 phi; Size fraction 27.205-25.383 µm, 5.2-5.3 phi; Size fraction 282.07-256.95 µm, 1.8-2.0 phi; Size fraction 29.157-27.205 µm, 5.1-5.2 phi; Size fraction 3.173-2.960 µm, 8.3-8.4 phi; Size fraction 3.401-3.173 µm, 8.2-8.3 phi; Size fraction 3.86-3.52 µm, 8.0-8.2 phi; Size fraction 307.786-287.175 µm, 1.7-1.8 phi; Size fraction 329.877-307.786 µm, 1.6-1.7 phi; Size fraction 33.01-30.07 µm, 4.9-5.1 phi; Size fraction 35.897-33.493 µm, 4.8-4.9 phi; Size fraction 373.15-339.92 µm, 1.4-1.6 phi; Size fraction 38.473-35.897 µm, 4.7-4.8 phi; Size fraction 4.187-3.906 µm, 7.9-8.0 phi; Size fraction 4.66-4.24 µm, 7.7-7.9 phi; Size fraction 406.126-378.929 µm, 1.3-1.4 phi; Size fraction 43.67-39.78 µm, 4.5-4.7 phi; Size fraction 435.275-406.126 µm, 1.2-1.3 phi; Size fraction 47.366-44.194 µm, 4.4-4.5 phi; Size fraction 493.63-449.67 µm, 1.0-1.2 phi; Size fraction 5.154-4.809 µm, 7.6-7.7 phi; Size fraction 5.524-5.154 µm, 7.5-7.6 phi; Size fraction 52.63-47.94 µm, 4.2-4.4 phi; Size fraction 535.887-500.000 µm, 0.9-1.0 phi; Size fraction 58.315-54.409 µm, 4.1-4.2 phi; Size fraction 594.87-541.89 µm, 0.7-0.9 phi; Size fraction 6.16-5.61 µm, 7.3-7.5 phi; Size fraction 6.801-6.346 µm, 7.2-7.3 phi; Size fraction 62.500-58.315 µm, 4.0-4.1 phi; Size fraction 659.754-615.572 µm, 0.6-0.7 phi; Size fraction 69.62-63.42 µm, 3.8-4.0 phi; Size fraction 7.289-6.801 µm, 7.1-7.2 phi; Size fraction 707.107-659.754 µm, 0.5-0.6 phi; Size fraction 76.947-71.794 µm, 3.7-3.8 phi; Size fraction 786.95-716.87 µm, 0.3-0.5 phi; Size fraction 8.15-7.42 µm, 6.9-7.1 phi; Size fraction 8.974-8.373 µm, 6.8-6.9 phi; Size fraction 82.469-76.947 µm, 3.6-3.7 phi; Size fraction 870.551-812.252 µm, 0.2-0.3 phi; Size fraction 9.618-8.974 µm, 6.7-6.8 phi; Size fraction 92.1-83.9 µm, 3.4-3.6 phi; Size fraction 933.033-870.551 µm, 0.1-0.2 phi; SO202/1; SO202/1_02-4; SO202/1_03-4; SO202/1_04-3; SO202/1_05-3; SO202/1_06-2; SO202/1_08-1; SO202/1_09-2; SO202/1_23-4; SO202/1_24-2; SO202/1_25-1; SO202/1_27-1; SO202/1_28-1; SO202/1_29-5; SO202/1_31-5; SO202/1_32-5; SO202/1_33-5; SO202/1_34-4; SO202/1_36-6; SO202/1_38-1; SO202/1_39-2; SO202/1_41-3; SO202/1_42-3; SO202/1_45-2; Sonne
    Type: Dataset
    Format: text/tab-separated-values, 2116 data points
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  • 5
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    (Tab 2) Salt-corrected He isotope, U/Th isotope, Calcium carbonate, biogenic opal and rare earth element concentrations measured on core-top sediments during SONNE cruise SO202 (INOPEX) (2014)
    PANGAEA
    Details
    Publication Date: 2023-10-05
    Keywords: Alkaline extraction and molbydate blue spectrophotometry; Bering Sea; Calcium carbonate; Calcium carbonate, standard deviation; Calculated; Cerium; Coulometer CM5012 CO2; DEPTH, sediment/rock; Dysprosium; Elevation of event; Erbium; Europium; Event label; Gadolinium; Helium-4, terrestrial; Helium-4, terrestrial, standard deviation; Holmium; ICP-MS, VG Elemental Axiom; ICP-MS, VG-Plasma-Quad ExCell; INOPEX; Lanthanum; Latitude of event; Longitude of event; Lutetium; MUC; MultiCorer; Neodymium; North Pacific Ocean; Opal, biogenic silica; Opal, biogenic silica, standard deviation; Praseodymium; Samarium; SO202/1; SO202/1_01-3; SO202/1_02-4; SO202/1_03-4; SO202/1_04-3; SO202/1_05-3; SO202/1_06-2; SO202/1_08-1; SO202/1_09-2; SO202/1_10-2; SO202/1_11-1; SO202/1_12-2; SO202/1_13-4; SO202/1_14-5; SO202/1_15-4; SO202/1_18-1; SO202/1_19-5; SO202/1_21-2; SO202/1_22-1; SO202/1_23-4; SO202/1_24-2; SO202/1_25-1; SO202/1_26-1; SO202/1_27-1; SO202/1_28-1; SO202/1_29-5; SO202/1_31-5; SO202/1_32-5; SO202/1_33-5; SO202/1_34-4; SO202/1_36-6; SO202/1_37-1; SO202/1_38-1; SO202/1_39-2; SO202/1_40-2; SO202/1_41-3; SO202/1_42-3; SO202/1_45-2; Sonne; Terbium; Thorium-230; Thorium-230, flux normalized; Thorium-230, flux normalized, standard deviation; Thorium-230, standard deviation; Thorium-230 excess, decay-corrected; Thorium-230 excess, decay-corrected, standard deviation; Thorium-232; Thorium-232, standard deviation; Thulium; Uranium-238; Uranium-238, standard deviation; Ytterbium
    Type: Dataset
    Format: text/tab-separated-values, 1110 data points
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  • 6
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    (Tab 3) Dust contribution to lithogenic fraction and dust flux in core-top sediments during SONNE cruise SO202 (INOPEX) (2014)
    PANGAEA
    Details
    Publication Date: 2023-10-05
    Keywords: DEPTH, sediment/rock; Dust, flux; Dust, flux, standard deviation; Dust contribution to lithogenic fraction; Dust contribution to lithogenic fraction, standard deviation; Elevation of event; Event label; Fine endmember contribution to lithogenic fraction; Fine endmember-derived, flux; Fine endmember-derived, flux, standard deviation; INOPEX; Latitude of event; Longitude of event; MUC; MultiCorer; North Pacific Ocean; SO202/1; SO202/1_01-3; SO202/1_02-4; SO202/1_03-4; SO202/1_04-3; SO202/1_05-3; SO202/1_06-2; SO202/1_08-1; SO202/1_09-2; SO202/1_23-4; SO202/1_24-2; SO202/1_25-1; SO202/1_27-1; SO202/1_28-1; SO202/1_29-5; SO202/1_31-5; SO202/1_32-5; SO202/1_33-5; SO202/1_34-4; SO202/1_36-6; SO202/1_37-1; SO202/1_38-1; SO202/1_39-2; SO202/1_40-2; SO202/1_41-3; SO202/1_42-3; SO202/1_45-2; Sonne
    Type: Dataset
    Format: text/tab-separated-values, 433 data points
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  • 7
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    He isotope, U/Th isotope, Calcium carbonate, biogenic opal, rare earth element concentrations, and grain size distribution measured on core-top sediments during SONNE cruise SO202 (INOPEX) (2014)
    PANGAEA
    In:  Supplement to: Serno, Sascha; Winckler, Gisela; Anderson, Robert F; Hayes, Christopher T; McGee, David; Machalett, Björn; Ren, Haojia Abby; Straub, Susanne M; Gersonde, Rainer; Haug, Gerald H (2014): Eolian dust input to the Subarctic North Pacific. Earth and Planetary Science Letters, 387, 252-263, https://doi.org/10.1016/j.epsl.2013.11.008
    Details
    Publication Date: 2023-11-27
    Description: Eolian dust is a significant source of iron and other nutrients that are essential for the health of marine ecosystems and potentially a controlling factor of the high nutrient-low chlorophyll status of the Subarctic North Pacific. We map the spatial distribution of dust input using three different geochemical tracers of eolian dust, 4He, 232Th and rare earth elements, in combination with grain size distribution data, from a set of core-top sediments covering the entire Subarctic North Pacific. Using the suite of geochemical proxies to fingerprint different lithogenic components, we deconvolve eolian dust input from other lithogenic inputs such as volcanic ash, ice-rafted debris, riverine and hemipelagic input. While the open ocean sites far away from the volcanic arcs are dominantly composed of pure eolian dust, lithogenic components other than eolian dust play a more crucial role along the arcs. In sites dominated by dust, eolian dust input appears to be characterized by a nearly uniform grain size mode at ~4 µm. Applying the 230Th-normalization technique, our proxies yield a consistent pattern of uniform dust fluxes of 1-2 g/m**2/yr across the Subarctic North Pacific. Elevated eolian dust fluxes of 2-4 g/m**2/yr characterize the westernmost region off Japan and the southern Kurile Islands south of 45° N and west of 165° E along the main pathway of the westerly winds. The core-top based dust flux reconstruction is consistent with recent estimates based on dissolved thorium isotope concentrations in seawater from the Subarctic North Pacific. The dust flux pattern compares well with state-of-the-art dust model predictions in the western and central Subarctic North Pacific, but we find that dust fluxes are higher than modeled fluxes by 0.5-1 g/m**2/yr in the northwest, northeast and eastern Subarctic North Pacific. Our results provide an important benchmark for biogeochemical models and a robust approach for downcore studies testing dust-induced iron fertilization of past changes in biological productivity in the Subarctic North Pacific.
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 8
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    (Tab 1) He isotope, U/Th isotope, Calcium carbonate, biogenic opal and rare earth element concentrations measured on core-top sediments during SONNE cruise SO202 (INOPEX) (2014)
    PANGAEA
    Details
    Publication Date: 2023-11-28
    Keywords: Alkaline extraction and molbydate blue spectrophotometry; Bering Sea; Calcium carbonate; Calcium carbonate, standard deviation; Calculated; Cerium; Coulometer CM5012 CO2; DEPTH, sediment/rock; Dysprosium; Elevation of event; Erbium; Europium; Event label; Gadolinium; Helium-3/Helium-4; Helium-3/Helium-4, standard deviation; Helium-4; Helium-4, standard deviation; Helium-4, terrestrial; Helium-4, terrestrial, standard deviation; Holmium; ICP-MS, VG Elemental Axiom; ICP-MS, VG-Plasma-Quad ExCell; INOPEX; Lanthanum; Latitude of event; Longitude of event; Lutetium; MUC; MultiCorer; Neodymium; Noble gas mass spectrometry; North Pacific Ocean; Opal, biogenic silica; Opal, biogenic silica, standard deviation; Praseodymium; Salinity; Salt content; Samarium; Sample mass; SO202/1; SO202/1_01-3; SO202/1_02-4; SO202/1_03-4; SO202/1_04-3; SO202/1_05-3; SO202/1_06-2; SO202/1_08-1; SO202/1_09-2; SO202/1_10-2; SO202/1_11-1; SO202/1_12-2; SO202/1_13-4; SO202/1_14-5; SO202/1_15-4; SO202/1_18-1; SO202/1_19-5; SO202/1_21-2; SO202/1_22-1; SO202/1_23-4; SO202/1_24-2; SO202/1_25-1; SO202/1_26-1; SO202/1_27-1; SO202/1_28-1; SO202/1_29-5; SO202/1_31-5; SO202/1_32-5; SO202/1_33-5; SO202/1_34-4; SO202/1_36-6; SO202/1_37-1; SO202/1_38-1; SO202/1_39-2; SO202/1_40-2; SO202/1_41-3; SO202/1_42-3; SO202/1_45-2; Sonne; Terbium; Thorium-230; Thorium-230, standard deviation; Thorium-232; Thorium-232, standard deviation; Thulium; Uranium-238; Uranium-238, standard deviation; Water loss per dry weight; Ytterbium
    Type: Dataset
    Format: text/tab-separated-values, 1293 data points
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  • 9
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    Composition of matrix glasses and melt inclusions of fallout tephra from ODP Hole 125-782A (2003)
    PANGAEA
    In:  Supplement to: Straub, Susanne M; Layne, Graham D (2003): The systematics of chlorine, fluorine, and water in Izu arc front volcanic rocks; implications for volatile recycling in subduction zones. Geochimica et Cosmochimica Acta, 67(21), 4179-4203, https://doi.org/10.1016/S0016-7037(03)00307-7
    Details
    Publication Date: 2024-01-09
    Description: We studied the systematics of Cl, F and H2O in Izu arc front volcanic rocks using basaltic through rhyolitic glass shards and melt inclusions (Izu glasses) from Oligocene to Quaternary distal fallout tephra. These glasses are low-K basalts to rhyolites that are equivalent to the Quaternary lavas of the Izu arc front (Izu VF). Most of the Izu glasses have Cl ~400-4000 ppm and F ~70-400 ppm (normal-group glasses). Rare andesitic melt inclusions (halogen-rich andesites; HRA) have very high abundances of Cl (~6600-8600 ppm) and F (~780-910 ppm), but their contents of incompatible large ion lithophile elements (LILE) are similar to the normal-group glasses. The preeruptive H2O of basalt to andesite melt inclusions in plagioclase is estimated to range from ~2 to ~10 wt% H2O. The Izu magmas should be undersaturated in H2O and the halogens at their preferred levels of crystallization in the middle to lower crust (~3 to ~11 kbar, ~820° to ~1200°C). A substantial portion of the original H2O is lost due to degassing during the final ascent to surface. By contrast, halogen loss is minor, except for loss of Cl from siliceous dacitic and rhyolitic compositions. The behavior of Cl, F and H2O in undegassed melts resembles the fluid mobile LILE (e.g.; K, Rb, Cs, Ba, U, Pb, Li). Most of the Cl (〉99%), H2O (〉95%) and F (〉53%) in the Izu VF melts appear to originate from the subducting slab. At arc front depths, the slab fluid contains Cl = 0.94+/-0.25 wt%, F = 990+/-270 ppm and H2O = 25+/-7 wt%. If the subducting sediment and the altered basaltic crust were the only slab sources, then the subducted Cl appears to be almost entirely recycled at the Izu arc (~77-129%). Conversely, H2O (~13-22% recycled at arc) and F (~4-6% recycled) must be either lost during shallow subduction or retained in the slab to greater depths. If a seawater-impregnated serpentinite layer below the basaltic crust were an additional source of Cl and H2O, the calculated percentage of Cl and H2O recycled at arc would be lower. Extrapolating the Izu data to the total length of global arcs (~37000 km), the global arc outflux of fluid-recycled Cl and H2O at subduction zones amounts to Cl ~2.9-3.8 mln ton/yr and H2O ~70-100 mln ton/yr, respectively - comparable to previous estimates. Further, we obtain a first estimate of global arc outflux of fluid-recycled F of ~0.3-0.4 mln ton/yr. Despite the inherent uncertainties, our results support models suggesting that the slab becomes strongly depleted in Cl and H2O in subduction zones. In contrast, much of the subducted F appears to be returned to the deep mantle, implying efficient fractionation of Cl and H2O from F during the subduction process. However, if slab devolatilization produces slab fluids with high Cl/F (~9.5), slab melting will still produce components with low Cl/F ratios (~0.9), similar to those characteristic of the upper continental crust (Cl/F ~0.3-0.9).
    Keywords: 125-782A; DRILL; Drilling/drill rig; Joides Resolution; Leg125; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 10
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    Chlorine concentrations and stable isotope ratios in Izu Bonin tephra (2010)
    PANGAEA
    In:  Supplement to: Barnes, David A; Straub, Susanne M (2010): Chorine stable isotope variations in Izu Bonin tephra: Implications for serpentinite subduction. Chemical Geology, 272(1-4), 62-74, https://doi.org/10.1016/j.chemgeo.2010.02.005
    Details
    Publication Date: 2024-01-09
    Description: d37Cl values were determined for Izu Bonin arc magmas erupted 0-44 Ma in order to better understand the time-dependent processing of volatiles in subduction zones. Pristine ash-sized particles (glass, pumice, scoria, and rock fragments) were handpicked from tephra drilled at ODP Site 782. d37Cl values for these particles span a large range from -2.1 to +1.7 per mil (error = ± 0.3 per mil) vs. SMOC (Standard Mean Ocean Chloride, defined as 0 per mil). The temporal data extend the previously reported range of d37Cl values of -2.6 to 0.4 per mil (bulk ash) and -5.4 to -0.1 per mil (volcanic gases) from the Quaternary Izu Bonin–Mariana volcanic front to more positive values. Overall, the temporal data indicate a time-progressive evolution, from isotopically negative Eocene and Oligocene magmas (-0.7 ± 1.1 per mil, n = 10) to Neogene magmas that have higher ?37Cl values on average (+0.3 ± 1.1 per mil; n = 13). The increase is due to the emergence of positive d37Cl values in the Neogene, while minimum d37Cl values are similar through time. The range in d37Cl values cannot be attributed to fractionation during melt formation and differentiation, and must reflect the diversity of Cl present in the arc magma sources. Cl clearly derives from the slab (〉 96% Cl in arc magmas), but d37Cl values do not correlate with isotope tracers (e.g. 207Pb/204Pb and 87Sr/86Sr) that are indicative of the flux from subducting sedimentary and igneous crust. Given the steady, high Cl flux since at least 42 Ma, the temporal variability of d37Cl values is best explained by a flux from subducting isotopically positive and negative serpentinite formed in the ocean basins that mingles with and possibly overprints the isotopically negative flux from sediment and igneous crust at arc front depths. The change in the d37Cl values before and after backarc spreading may reflect either a tectonically induced change in the mechanism of serpentinite formation on the oceanic plate, or possibly the integration of isotopically positive wedge serpentinite as arc fluid source during the Neogene. Our study suggests that serpentinites are important fluid sources at arc front depth, and implies the return of isotopically positive and negative Cl from the Earth surface to the mantle.
    Keywords: 125-782A; 21DS5; 58-442B; 64DS; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Joides Resolution; Leg125; Leg58; Mariana arc/Philippine Basin; North Pacific/BASIN; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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