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  • 1
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    PANGAEA
    In:  Supplement to: Gieskes, Joris M; Johnston, Kirk; Boehm, Marcus (1985): Appendix: Interstitial water studies, Leg 66. In: von Heune, R; Aubouin, J; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 84, 961-967, https://doi.org/10.2973/dsdp.proc.84.app.1985
    Publication Date: 2018-09-27
    Description: During Leg 66, a transect was drilled across the Middle America Trench off Mexico. In this report, interstitial water analyses for Sites 487 (on oceanic crust), 490, 491, and 492 (continental slope apron), and 493 (upper continental slope) are presented. All sites are characterized by high sedimentation rates, and as a result sulfate reduction and methane generation processes are very important. At Sites 490 through 492 decreases in chlorinity are evidence of the presence of gas hydrates. At Site 493 a sharp increase in dissolved calcium and the complete depletion of dissolved magnesium just above basement indicate that weathering of continental crust is still an ongoing process.
    Type: Dataset
    Format: text/tab-separated-values, 532 data points
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  • 2
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    PANGAEA
    In:  Supplement to: Magenheim, Andrew J; Spivack, Arthur J; Alt, Jeffrey C; Bayhurst, Gregory; Chan, Lui-Heung; Zuleger, Evelyn; Gieskes, Joris M (1995): Borehole fluid chemistry in Hole 504B, Leg 137: formation water or in-situ reaction? In: Erzinger, J; Becker, K; Dick, HJB; Stokking, LB (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 137, 141-152, https://doi.org/10.2973/odp.proc.sr.137140.024.1995
    Publication Date: 2019-04-16
    Description: Circulation of seawater through basaltic basement for several million years after crustal emplacement has been inferred from studies of surface heat flow, and may play a significant role in the exchange of elements between the oceanic crust and seawater. Without direct observation of the fluid chemistry, interpretations regarding the extent and timing of this exchange must be based on the integrated signal of alteration found in sampled basalts. Much interest has thus been expressed in obtaining and analyzing fluids directly from basaltic formations. It has been proposed that open oceanic boreholes can be used as oceanic groundwater wells to obtain fluids that are circulating within the formation. Water samples were collected from the open borehole in Hole 504B prior to drilling operations on Leg 137, with the original intention of collecting formation fluids from the surrounding basaltic rocks. Past results have yielded ambiguous conclusions as to the origin of the fluids recovered-specifically, whether or not the fluids were true formation fluids or merely the result of reaction of seawater in the borehole environment. The chemistry of eight borehole fluid samples collected during Leg 137 is discussed in this paper. Large changes in major, minor, and isotopic compositions relative to unaltered seawater were observed in the borehole fluids. Compositional changes increased with depth in the borehole. The samples exhibit the effect of simple mixing of seawater, throughout the borehole, with a single reacted fluid component. Analysis and interpretation of the results from Leg 137 in light of past results suggest that the chemical signals observed may originate predominantly from reaction with basaltic rubble residing at the bottom of the hole during the interim between drilling legs. Although this endeavor apparently did not recover formation waters, information on the nature of reaction between seawater and basalt at the prevalent temperatures in Hole 504B (〉160°C) has been gained that can be related to reconstruction of the alteration history of the oceanic crust. Isotopic analyses allow calculation of element-specific water/rock mass ratios (Li and Sr) and are related to the extent of chemical exchange between the borehole fluids and basalt.
    Type: Dataset
    Format: text/tab-separated-values, 318 data points
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  • 3
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    PANGAEA
    In:  Supplement to: Gieskes, Joris M; Johnston, Kirk (1985): Interstitial water studies, Leg 80. In: De Graciansky, PC; Poag, CW; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Gov. Printing Office), 80, 1047-1053, https://doi.org/10.2973/dsdp.proc.80.149.1985
    Publication Date: 2018-09-27
    Description: Interstitial water studies of sediments recovered during DSDP Leg 80 (Goban Spur transect) indicate a well-developed dissolved-sulfate minimum at Site 548 resulting from increased sulfate reduction in the rapidly deposited Pleistocene sediment section. Changes in the concentration of dissolved strontium at each site must be related to carbonate recrystallization processes.
    Type: Dataset
    Format: text/tab-separated-values, 422 data points
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  • 4
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    PANGAEA
    In:  Supplement to: Gieskes, Joris M; Sirocky, Frank X; LaKind, Judy (1983): Interstitial water studies, Leg 72. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 391-394, https://doi.org/10.2973/dsdp.proc.72.109.1983
    Publication Date: 2018-09-27
    Description: Interstitial waters collected at Sites 515 and 516 during DSDP Leg 72 have been analyzed for major and minor constituents. At both sites increases in dissolved calcium and decreases in dissolved magnesium with depth imply reactions in the sediment column involving these constituents. It is suggested that these concentration changes are related to reactions involving biogenic silica transformation.
    Type: Dataset
    Format: text/tab-separated-values, 286 data points
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  • 5
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    PANGAEA
    In:  Supplement to: Gieskes, Joris M; Elderfield, Henry; Nevsky, Brad (1983): Interstitial water studies, Leg 65, Deep Sea Drilling Project. In: Lewis, BTR; Robinson, P; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 65, 441-449, https://doi.org/10.2973/dsdp.proc.65.118.1983
    Publication Date: 2019-01-28
    Description: Studies of the chemical composition of interstitial waters obtained at Sites 482, 483, 484, and 485 on DSPP Leg 65 have revealed the following: (1) Early diagenetic processes in these rapidly deposited sediments led to large decreases in dissolved sulfate and concomitant increases in dissolved ammonia and bicarbonate (alkalinity). Associated with these processes of biodegradation of organic matter are carbonate-precipitation reactions leading to minima in dissolved calcium. (2) In Sites 482, 483, and 485 a flux of dissolved calcium from the basalts of Layer 2 into the sediments is implied. This flux is diffusive in nature, and in none of the sites, drilled on very young oceanic crust, is there any evidence for convective motion of pore fluids in the sediment column. (3) As a result of elevated temperatures in the sediments (caused by relatively high heat flow on young oceanic crust), silica diagenesis occurs at a relatively early stage. This diagenesis is associated with processes involving the alteration of volcanic matter in the sediments (low dissolved 87Sr/86Sr), which results in decreases in dissolved silica, magnesium, and potassium, and increases in dissolved calcium, lithium, and strontium.
    Type: Dataset
    Format: text/tab-separated-values, 680 data points
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  • 6
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    PANGAEA
    In:  Supplement to: Gieskes, Joris M; Johnson, Jeff (1981): Interstitial-water studies, Leg 61. In: Larson, RL; Schlanger, SO; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 61, 603-605, https://doi.org/10.2973/dsdp.proc.61.116.1981
    Publication Date: 2019-01-27
    Description: Concentration gradients of Ca, Mg, K, Sr, and Li at Site 462, Leg 61, are linear with depth; large changes occur in the unsampled, low-porosity limestone-chert zone between 375 and 445 meters. Correlations between Ca and Mg are linear, but breaks occur in Ca-Sr and Ca-K correlations. These breaks imply release of strontium in the limestones (recrystallization of carbonate) and uptake of potassium (formation of authigenic K-feldspar?).
    Type: Dataset
    Format: text/tab-separated-values, 152 data points
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  • 7
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    PANGAEA
    In:  Supplement to: Gieskes, Joris M; Nevsky, Brad; Chain, Aileen (1981): Interstitial water studies, Leg 63. In: Yeats, RS; Haq, BU; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 63, 623-629, https://doi.org/10.2973/dsdp.proc.63.120.1981
    Publication Date: 2019-01-27
    Description: Interstitial water studies of drill sites off the California Continental Borderland (Sites 467, 468, 469) reveal that fresh water can penetrate through the sediments as far as the San Miguel Gap (Site 467). In the rapidly deposited sediments of Site 467, decreases in magnesium concentrations can be related to the formation of dolomite in the claystone unit of the sediment column. Decreases in magnesium and increases in calcium at Site 469 at the base of the Patton Escarpment are probably the result of alteration of volcanic matter in the sediments and/or the underlying basalts. Studies of the gradients of calcium, magnesium, potassium, strontium, and lithium at Site 471 indicate that a 150-meter-thick porcellanite-claystone-limestone complex acts as an almost complete barrier to diffusive exchange with the underlying sediments. Uptake reactions involving potassium and magnesium may still occur in the Porcellanite complex. At all sites, with the exception of Site 467, gradients of calcium show concentration increases with depth and simultaneous decreases in dissolved magnesium - a pattern commonly observed in open-ocean environments.
    Type: Dataset
    Format: text/tab-separated-values, 604 data points
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  • 8
    Publication Date: 2019-04-16
    Type: Dataset
    Format: text/tab-separated-values, 247 data points
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  • 9
    Publication Date: 2019-01-26
    Type: Dataset
    Format: text/tab-separated-values, 49 data points
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  • 10
    Publication Date: 2018-09-27
    Type: Dataset
    Format: text/tab-separated-values, 107 data points
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