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  • 1
    Electronic Resource
    Electronic Resource
    Evidence for fluid flow in the Japan Trench forearc using isotope geochemistry (Cl, Sr, B): Results from ODP Site 1150 (2004)
    Melbourne, Australia : Blackwell Science Pty
    The @island arc 13 (2004), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract  Interstitial pore waters from Ocean Drilling Program Site 1150, where ∼1200 m of sub-sea-floor sediment from the upper Japan Trench forearc were recovered, were analyzed for element concentrations and Cl, Sr and B isotopes. Although chlorinity showed profound down-hole freshening to values as low as ∼310 mm (0.55 × seawater) in the deeper part of the claystone-dominated succession, both Sr and B concentrations showed an overall increase. Sr reached concentrations of up to 〉250 µm (∼3.00 × seawater), whereas B-enrichment was even stronger (3920 µm; i.e. 9.30 × seawater). The strong variations in concentration correspond to fractionation reactions in the deep, tectonically deformed part of the forearc. The heavily fractured portion of Site 1150 (from ∼700 m to the total depth of the hole) has two shear zones that very likely act as conduits that expel deep-seated fluids to the sea floor. These fluids not only showed the strongest freshening of Cl, but were also characterized by low δ37Cl measurements (down to −1.1‰), the heaviest δ11B measurements (∼40–46‰) and the least radiogenic 87Sr/ 86Sr measurements. The profound isotope anomalies together with the excursions in element concentrations suggest that diagenetic processes operate at that depth. These include clay mineral diagenesis, alteration of tephra from the Japan and Izu Arcs, and possibly transformation of biogenic silica from abundant diatoms. Given the strong enrichment of some mobile elements (e.g. Sr, B, Li), enhanced fluid flow through permeable penetrative faults through the forearc (like the shear zones at Site 1150) could be an efficient mechanism for back-flux of those elements from the deep forearc into the hydrosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1738.2003.00424.x
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Cross-section through the frontal Japan Trench subduction zone: Geochemical evidence for fluid flow and fluid–rock interaction from DSDP and ODP pore waters and sediments (2004)
    Melbourne, Australia : Blackwell Science Pty
    The @island arc 13 (2004), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract  Fluids and sediments from Deep Sea Drilling Project/Ocean Drilling Program Legs (56, 57, 87 and 186) along a transect extending from the subducting plate, across the midslope and upper slope of the Japan Trench forearc were analyzed for B and B isotopes in order to assess their composition and fluid–sediment interaction. At the reference Site 436 on the subducting plate, changes in B contents and B isotopes are controlled by the lithology and diagenesis only. The midslope Sites 440 and 584 showed stronger variations in the B geochemistry, which can be related to diagenesis and tectonic dewatering along faults. The strongest changes in the B geochemistry were observed on the upper slope Sites 1150 and 1151, where profound down-hole freshening (chlorinities as low as ∼310 mmol) coincides with a B enrichment (up to 9.3 × seawater concentration). The B isotope pore fluid profile of Site 1150 displayed a bimodal variation with depth, first increasing to values more positive than seawater, then shifting to lower signatures typical for deep-seated fluids, whereas Site 1151 showed a constant B decrease with depth. Sites 1150 and 1151 sediments showed B increases with depth to values as high as ∼164 p.p.m. and isotopic compositions ranging from ∼+4 to −9‰. A linear decrease in Bsolid/Bfluid ratio, suggests that B geochemistry of the upper slope sites is controlled by fluid–rock interaction and deep-seated fluid flow, whereas constant Bsolid/Bfluid ratios were observed at the reference site on the incoming plate. This fluid overprint is probably caused by normal faults in the sediment cover which might be interconnected to deep thrusts in the underlying Cretaceous accreted wedge. This suggests that the erosive Japan Trench margin is characterized by back-flux of deep-seated, B-enriched fluids into the ocean, which is facilitated by extensional normal faulting as a result of tectonic erosion and subsidence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1738.2003.00425.x
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    Paper (German National Licenses)
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  • 3
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    Fluid flow in sediments along the Costa Rican continental margin - quantification and origin of fluids (2003)
    In:  [Talk] In: EGS-AGU-EUG Joint Assembly, 06.- 11.04.2003, Nice, France .
    Details
    Publication Date: 2020-05-07
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 4
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    Boron and boron isotope geochemistry: evidence for fluid processes at convergent margins (2000)
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, Germany, 157 pp
    Details
    Publication Date: 2020-05-05
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
  • 5
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    Boron isotope geochemistry and U-Pb systematics of altered MORB from the Australian Antarctic Disordance (ODP Leg 187) (2007)
    Elsevier
    In:  Chemical Geology, 242 . pp. 458-472.
    Details
    Publication Date: 2017-12-07
    Description: Boron and Pb isotopic compositions together with B–U–Th–Pb concentrations were determined for Pacific and Indian mantle-type mid-ocean ridge basalts (MORB) obtained from shallow drill holes near the Australian Antarctic Discordance (AAD). Boron contents in the altered samples range from 29.7 to 69.6 ppm and are extremely enriched relative to fresh MORB glass with 0.4–0.6 ppm B. Similarly the δ11B values range from 5.5‰ to 15.9‰ in the altered basalts and require interaction with a δ11B enriched fluid similar to seawater ∼ 39.5‰ and/or boron isotope fractionation during the formation of secondary clays. Positive correlations between B concentrations and other chemical indices of alteration such as H2O CO2, K2O, P2O5, U and 87Sr/86Sr indicate that B is progressively enriched in the basalts as they become more altered. Interestingly, δ11B shows the largest isotopic shift to + 16‰ in the least altered basalts, followed by a continual decrease to + 5–6‰ in the most altered basalts. These observations may indicate a change from an early seawater dominated fluid towards a sediment-dominated fluid as a result of an increase in sediment cover with increasing age of the seafloor. The progression from heavy δ11B towards lighter values with increasing degrees of alteration may also reflect increased formation of clay minerals (e.g., saponite). A comparison of 238U/204Pb and 206Pb/204Pb in fresh glass and variably altered basalt from Site 1160B shows extreme variations that are caused by secondary U enrichment during low temperature alteration. Modeling of the U–Pb isotope system confirms that some alteration events occurred early in the 21.5 m.y. history of these rocks, even though a significant second pulse of alteration happened at ∼ 12 Ma after formation of the crust. The U–Pb systematics of co-genetic basaltic glass and variably low temperature altered basaltic whole rocks are thus a potential tool to place age constraints on the timing of alteration and fluid flow in the ocean crust.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.chemgeo.2007.05.004
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Boron concentrations and isotope ratios of authigenic carbonates from the Oregon margin (2001)
    PANGAEA
    In:  Supplement to: Deyhle, Annette; Kopf, Achim J; Eisenhauer, Anton (2001): Boron systematics of authigenic carbonates: a new approach to identify fluid processes in accretionary prisms. Earth and Planetary Science Letters, 187(1-2), 191-205, https://doi.org/10.1016/S0012-821X(01)00268-0
    Details
    Publication Date: 2024-01-09
    Description: Boron contents and boron, carbon and oxygen stable isotopes were determined for authigenic carbonates recovered from Ocean Drilling Program Leg 146, Oregon margin. Carbonate precipitates are the most widespread authigenic phase in the shallow accretionary wedge and carry chemical information about long-term variations in pore fluid origin and flow paths in the Cascadia subduction zone. Drilling the first ridge (toe area including the frontal thrust) and the second ridge (or Hydrate Ridge) of the prism demonstrated different fluid regimes, with higher B contents in the authigenic precipitates at the toe. The delta11B of 18 authigenic precipitates analysed ranges from 13.9 per mil to as high as 39.8 per mil, extending the upper range of previously reported carbonate delta11B values considerably. When related to the delta11B ratio of their parent solutions, these data are characteristic of fluid-related processes in accretionary prisms. Together with delta13C and delta18O, delta11B ratios of the carbonate concretions, nodules and crusts allow one to distinguish between precipitation influenced by (i) seawater, (ii) fluid reservoirs at different depth levels within the accretionary prism and (iii) cage water from dissociated gas hydrates, the latter possibly indicating a fluctuation of the bottom simulating reflector during most recent Earth's history. From this first systematic boron study on authigenic precipitates from an accretionary prism it is suggested that B contents of such carbonate crusts and concretions exceed those reported for other marine carbonates. Given the abundance of such precipitates at convergent margins, they represent a significant B sink in geochemical cycling. Isotopic compositions of the parent fluids to the carbonates mirror B chemistry of modern pore waters from convergent margins. The precipitates carry information of different subduction-related fluid processes over a certain period of time, and hence are a crucial tracer in the investigation of palaeo-fluid flow.
    Keywords: 146-891B; 146-892; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg146; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 7
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    Chemical and isotopic compositions of altered MORB from ODP Holes 187-1154A, 187-1155B, and 187-1160B (2007)
    PANGAEA
    In:  Supplement to: Krolikowska-Ciaglo, Sylwia; Deyhle, Annette; Hauff, Folkmar; Hoernle, Kaj (2007): Boron isotope geochemistry and U/Pb systematics of altered MORB from the Australian Antarctic discordance (ODP Leg 187). Chemical Geology, 242(3-4), 455-469, https://doi.org/10.1016/j.chemgeo.2007.05.004
    Details
    Publication Date: 2024-01-09
    Description: Boron and Pb isotopic compositions together with B-U-Th-Pb concentrations were determined for Pacific and Indian mantle-type mid-ocean ridge basalts (MORB) obtained from shallow drill holes near the Australian Antarctic Discordance (AAD). Boron contents in the altered samples range from 29.7 to 69.6 ppm and are extremely enriched relative to fresh MORB glass with 0.4-0.6 ppm B. Similarly the d11B values range from 5.5‰ to 15.9‰ in the altered basalts and require interaction with a d11B enriched fluid similar to seawater ~39.5‰ and/or boron isotope fractionation during the formation of secondary clays. Positive correlations between B concentrations and other chemical indices of alteration such as H2O CO2, K2O, P2O5, U and 87Sr/86Sr indicate that B is progressively enriched in the basalts as they become more altered. Interestingly, d11B shows the largest isotopic shift to +16‰ in the least altered basalts, followed by a continual decrease to +5-6‰ in the most altered basalts. These observations may indicate a change from an early seawater dominated fluid towards a sediment-dominated fluid as a result of an increase in sediment cover with increasing age of the seafloor. The progression from heavy d11B towards lighter values with increasing degrees of alteration may also reflect increased formation of clay minerals (e.g., saponite). A comparison of 238U/204Pb and 206Pb/204Pb in fresh glass and variably altered basalt from Site 1160B shows extreme variations that are caused by secondary U enrichment during low temperature alteration. Modeling of the U-Pb isotope system confirms that some alteration events occurred early in the 21.5 Ma history of these rocks, even though a significant second pulse of alteration happened at ~12 Ma after formation of the crust. The U-Pb systematics of co-genetic basaltic glass and variably low temperature altered basaltic whole rocks are thus a potential tool to place age constraints on the timing of alteration and fluid flow in the ocean crust.
    Keywords: 187-1154A; 187-1155B; 187-1160B; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Leg187; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 8
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    Carbon, boron and oxygen isotope ratios of sediments from the Moresby Seamount (2003)
    PANGAEA
    In:  Supplement to: Kopf, Achim J; Behrmann, Jan-Hinrich; Deyhle, Annette; Roller, Sybille; Erlenkeuser, Helmut (2003): Isotopic evidence (B, C, O) of deep fluid processes in fault rock from the active Woodlark Basin detachment zone. Earth and Planetary Science Letters, 208(1-2), 51-68, https://doi.org/10.1016/S0012-821X(03)00016-5
    Details
    Publication Date: 2024-01-09
    Description: We report results from boron, carbon and oxygen stable isotope analyses of faulted and veined rocks recovered by scientific ocean drilling during ODP Leg 180 in the western Woodlark Basin, off Papua New Guinea. In this area of active continental extension, crustal break-up and incipient seafloor spreading, a shallow-dipping, seismically active detachment fault accommodates strain, defining a zone of mylonites and cataclasites, vein formation and fluid infiltration. Syntectonic microstructures and vein-fill mineralogy suggest frictional heating during slip during extension and exhumation of Moresby Seamount. Low carbon and oxygen isotope ratios of calcite veins indicate precipitation from hydrothermal fluids (delta13C PDB down to -17 per mil ; delta18O PDB down to -22 per mil ) formed by both dehydration and decarbonation. Boron contents are low (〈7 ppm), indicating high-grade metamorphic source rock for the fluids. Some of the delta11B signatures (17-35 per mil ; parent solutions to calcite vein fills) are low when compared to deep-seated waters in other tectonic environments, likely reflecting preferential loss of 11B during low-grade metamorphism at depth. Pervasive devolatilization and flux of CO2-rich fluids are evident from similar vein cement geochemistry in the detachment fault zone and splays further updip. Multiple rupture-and-healing history of the veins suggests that precipitation may be an important player in fluid pressure evolution and, hence, seismogenic fault movement.
    Keywords: 180-1108; 180-1110; 180-1111; 180-1112; 180-1113; 180-1114; 180-1117; COMPCORE; Composite Core; Joides Resolution; Leg180; Ocean Drilling Program; ODP; Solomon Sea
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 9
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    Geochemistry of pore fluids and bulk solids of ODP Site 195-1200, South Chamorro Seamount (2005)
    PANGAEA
    In:  Supplement to: Wei, Wei; Kastner, Miriam; Deyhle, Annette; Spivack, Arthur J (2005): Geochemical cycling of fluorine, chlorine, bromine, and boron and implications for fluid-rock reactions in Mariana forearc, South Chamorro Seamount, ODP Leg 195. In: Shinohara, M; Salisbury, MH; Richter, C (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 195, 1-23, https://doi.org/10.2973/odp.proc.sr.195.106.2005
    Details
    Publication Date: 2024-01-09
    Description: At the South Chamorro Seamount in the Mariana subduction zone, geochemical data of pore fluids recovered from Ocean Drilling Program Leg 195 Site 1200 indicate that these fluids evolved from dehydration of the underthrusting Pacific plate and upwelling of fluids to the surface through serpentinite mud volcanoes as cold springs at their summits. Physical conditions of the fluid source at 27 km were inferred to be at 100°-250°C and 0.8 GPa. The upwelling of fluid is more active near the spring in Holes 1200E and 1200A and becomes less so with increasing distance toward Hole 1200D. These pore fluids are depleted in Cl and Br, enriched in F (except in Hole 1200D) and B (up to 3500 µM), have low 11B (16-21), and have lower than seawater Br/Cl ratios. The mixing ratios between seawater and pore fluids is calculated to be ~2:1 at shallow depth. The F, Cl, and Br concentrations, together with B concentrations and B isotope ratios in the serpentinized igneous rocks and serpentine muds that include ultramafic clasts from Holes 1200A, 1200B, 1200D, 1200E, and 1200F, support the conclusion that the fluids involved in serpentinization originated from great depths; the dehydration of sediments and altered basalt at the top of the subducting Pacific plate released Cl, H2O, and B with enriched 10B. Calculation from B concentrations and upwelling rates indicate that B is efficiently recycled through this nonaccretionary subduction zone, as through others, and may contribute the critical missing B of the oceanic cycle.
    Keywords: 195-1200A; 195-1200B; 195-1200D; 195-1200E; 195-1200F; DRILL; Drilling/drill rig; Joides Resolution; Leg195; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 10
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    (Table 1) Boron analyses from ODP Sites 186-1150 and 186-1151 (2002)
    PANGAEA
    In:  Supplement to: Deyhle, Annette; Kopf, Achim J (2002): Strong B enrichment and anomalous d11B in pore fluids from the Japan Trench forearc. Marine Geology, 183(1-4), 1-15, https://doi.org/10.1016/S0025-3227(02)00186-X
    Details
    Publication Date: 2024-01-09
    Description: Interstitial pore waters from Ocean Drilling Program (ODP) Sites 1150 and 1151, both penetrating ca. 1200 m of sub-seafloor sediment from the upper Japan Trench forearc, were analyzed for B concentrations and d11B isotopes. B concentrations cover a wide range from 329 to 3920 µM (0.8-9.3* seawater) and vary isotopically from +20 to +46 per mil (relative to SRM 951). In general, B concentrations increase more or less steadily with depth. At both sites, the B enrichment and isotopic changes seem to be related to a deep fluid influence, possibly coupled with alteration of volcanic products. Silica diagenesis does not affect the B geochemistry of the waters, as is evident from intact diatom tests and high opal-A contents throughout the holes. The B enrichment is more pronounced at Site 1150 in the seismic portion of the forearc. Here, a large positive anomaly in d11B values is observed, which corresponds with abundant fracturing and two prominent shear zones. At about the same depth range at Site 1151, the d11B values show a negative shift, attesting to an enrichment in 10B in the fluid as a result of B desorption from clay due to burial and tectonic stress. We conclude that B release from clay minerals is the major contributor to pore fluid anomalies, and that fluid flow through permeable out-of-sequence thrust (like the shear zones at Site 1150) may be an efficient mechanism for B backflux from the forearc into the hydrosphere.
    Keywords: 186-1150A; 186-1150B; 186-1151A; 186-1151C; Boron; Boron/Chlorine ratio; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; ICP-MS, VG-Plasma-Quad 1; Joides Resolution; Leg186; North Pacific Ocean; Ocean Drilling Program; ODP; pH; Porosity; Precision; Sample code/label; δ11B
    Type: Dataset
    Format: text/tab-separated-values, 624 data points
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