Heat transport in serpentinites

Seipold, U.; Schilling, Frank

doi:10.1016/s0040-1951(03)00183-5

Cited by 33 publications

(20 citation statements)

References 25 publications

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“…12,47,53 This is evidenced by a 12 h requirement 53 to fully dehydroxylate serpentine minerals and form forsterite when heat treated isothermally near the dehydroxylation equilibrium temperature of about 577 °C. 47 Certainly, at this sluggish rate, production of thermally activated serpentine is neither practical nor economically feasible. Improving the rate at which serpentine dehydroxylates requires employing appropriate strategies that circumvent the rate limiting steps and accelerate the reaction progress.…”

Section: Kinetic Studiesmentioning

confidence: 99%

Dehydroxylation of serpentine minerals: Implications for mineral carbonation

Dlugogorski

Balucan

2014

Renewable and Sustainable Energy Reviews

118

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This review examines studies on the dehydroxylation of serpentine minerals published in the open literature from 1945 to 2013, with brief description of earlier work.Presently, the energy cost and technological complications, required to amorphise serpentine minerals by dehydroxylation, prevent their large-scale application for sequestering of CO 2 . The focus of the review is on thermal dehydroxylation, although mechanical dehydroxylation by grinding and shock, as well as thermomechanical dehydroxylation are also covered. We discuss the chemical and physical transformations involving the proposed mechanisms, thermal stability, reaction kinetics, the formation of intermediates and products, associated heat requirements, factors that influence the reaction, as well as associated enhancements in both dissolution and carbonation. The primary factor controlling the availability of Mg for either extraction or carbonation is structural disorder. The review demonstrates that activation processes must avoid recrystallisation of disordered phases to fosterite and enstatite, and minimise the partial pressure of water vapour that engenders reverse reaction.

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Section: Kinetic Studiesmentioning

confidence: 99%

Dehydroxylation of serpentine minerals: Implications for mineral carbonation

Dlugogorski

Balucan

2014

Renewable and Sustainable Energy Reviews

118

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“…The thermal conductivity ( K ) of serpentinites is significantly smaller than that of fresh peridotites under similar P‐T conditions. To account for this effect in our models, we proceed as follows: (1) the thermal conductivity of serpentinites is calculated as a function of P and T following the parameterization proposed by Seipold and Schilling [2003]; (2) an average K value is estimated for the serpentinites on each of the segments characterized by 70%–20% and 20%–0% serpentinization, respectively (see Figure 5); and (3) the final thermal conductivity of the partially serpentinized mantle is then computed as the weighted average of the values for pure serpentinites ( K serp ) and pure peridotites ( K perid ) as K = K serp X serp + K perid X perid , where X serp and X perid are the volume fractions of serpentinite and peridotite, respectively. The apparently rough approximation described in (2) is justified given the small (≤ 4%) difference in K values within each segment (Figure 5).…”

Section: Present‐day Lithospheric Structurementioning

confidence: 99%

Lithospheric structure of the Gorringe Bank: Insights into its origin and tectonic evolution

et al. 2010

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[1] The Gorringe Bank is a 5000 m high seamount near the Atlantic coast of Iberia characterized by a 9 m high geoid anomaly and a ∼120 mGal Bouguer anomaly relative to the surrounding abyssal plains. It has been linked to a NW directed thrust carrying exhumed upper mantle rocks and transitional crust on top of flexeddown Eurasian oceanic crust along the Tagus Abyssal Plain. However, estimations of crustal shortening have yielded dissimilar results, and the deep structure of the ridge remains highly unknown. We present a restored cross section and a new model of the lithospheric structure based on gravity, geoid, elevation, and the presence of serpentinized peridotites. At least 20 km of shortening took place along a flat-ramp-flat thrust fault, and the density structure of the lithosphere is consistent with mantle serpentinization varying from 70% at the surface to 20% at 14 km depth and 0% at 40 km. The topographic relief and gravity anomalies are explained by assuming a flexural isostatic model with an elastic thickness T e of ∼30 km. The evolution of the Gorringe Bank since the Late Jurassic is interpreted in relation to Eurasia-Africa-North America plate motion in four stages: (1) transtension between Newfoundland-Iberia and Africa, which generated small oceanic basins and mantle exhumation; (2) opening of the North Atlantic and seafloor spreading at the NW side of the exhumed Gorringe, which produced gabbro intrusions and serpentinization; (3) a quiescent tectonic period dominated by subsidence and sediment accumulation; and (4) a transpressional plate boundary between Eurasia and Africa with NW directed subcrustal thrusting and generation of the present Gorringe relief. Citation: Jiménez-Munt, I., M. Fernàndez, J. Vergés, J. C. Afonso, D. Garcia-Castellanos, and J. Fullea (2010), Lithospheric structure of the Gorringe Bank: Insights into its origin and tectonic evolution, Tectonics, 29, TC5019,

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“…The thermal conductivity of serpentinite group minerals as a function of temperature has been previously investigated experimentally. We have fitted the thermal conductivity data for antigorite of Seipold and Schilling (2003) over the range 300-1000 K (Fig. 6a).…”

Section: Core and Ice VI Propertiesmentioning

confidence: 99%

“…Temperature-dependent properties of the antigorite core and ice VI shell from experimental data. (a) Thermal conductivity data for antigorite from Seipold and Schilling (2003), determined from Eq. (34); thermal conductivity data for ice VI from Ross et al (1978), determined from Eq.…”

Section: Core and Ice VI Propertiesmentioning

confidence: 99%