Hydrothermal heat flow near the Main Central Thrust, central Nepal Himalaya

Derry, Louis A.; Evans, Matthew J.; Darling, Robert S.; France‐Lanord, Christian

doi:10.1016/j.epsl.2009.06.036

Cited by 45 publications

(32 citation statements)

References 43 publications

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“…For comparative purposes in table 1, we have presented the results of modeling assuming both the high value preferred for this region by Derry et al (2009) and a much lower value more in keeping with typical continental values (357C/km). The lower value of G mod results in large increases in modeled Ė for all structural levels, but the dramatic difference between Pleistocene exhumation rates of the Dhaulagiri hanging wall and those of deeper structural packages remains.…”

Section: Sensitivity Analysis Of Models and Comparisons Withmentioning

confidence: 99%

“…Derry et al (2009). estimated a very high value of 757C/km based on work in central Nepal, including our study area.…”

Section: Thermochronologic Constraints On the Recentmentioning

confidence: 99%

“…Helium diffusion kinetic parameters are from Farley (2000) for ApHe and from Reiners et al (2004) for ZrnHe. Modeling assumed two different values for the modern geothermal gradient (G mod ): the 757C/km value estimated for this area by Derry et al (2009) and a low value of 357C/km for illustrative purposes. The surface temperature was assumed in all cases to be 57C, and sample elevations above the mean elevation in the area were estimated with equation (2) of Willett and Brandon (2013).…”

Section: Thermochronologic Constraints On the Recentmentioning

confidence: 99%

See 2 more Smart Citations

Evidence for Pleistocene Low-Angle Normal Faulting in the Annapurna-Dhaulagiri Region, Nepal

McDermott¹,

Hodges²,

Whipple³

et al. 2015

The Journal of Geology

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Section: Sensitivity Analysis Of Models and Comparisons Withmentioning

confidence: 99%

“…Derry et al (2009). estimated a very high value of 757C/km based on work in central Nepal, including our study area.…”

Section: Thermochronologic Constraints On the Recentmentioning

confidence: 99%

Section: Thermochronologic Constraints On the Recentmentioning

confidence: 99%

See 1 more Smart Citation

Evidence for Pleistocene Low-Angle Normal Faulting in the Annapurna-Dhaulagiri Region, Nepal

McDermott¹,

Hodges²,

Whipple³

et al. 2015

The Journal of Geology

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“…Further, high scarp relief is likely to induce a high hydraulic gradient, allowing high fluid velocities and infiltration depths (Section 7) [19]. The fault-related topography, being essential to establish fluid advection [10,18], also controls the intensity of the hydrothermal activity ( Figure 6). …”

Section: Controls On the Hydrothermal Activitymentioning

confidence: 99%

“…Based on numerical studies, conceptual models suggest that meteoric water infiltrates from the top of the ranges to kilometric depths, before rising up to the surface through permeable zones. Topography [18][19][20], buoyancy forces [21,22], and groundwater recharge [19], inducing both a hydraulic gradient and thermal disturbance, exert a significant role on hydrothermal circulation. Petrophysical and thermal properties, especially permeability [23], play a critical role in the establishment of a fluid circulation pattern and thus in the building of possible 2 Geofluids thermal anomalies [11,24].…”

Section: Introductionmentioning

confidence: 99%

Fault-Related Controls on Upward Hydrothermal Flow: An Integrated Geological Study of the Têt Fault System, Eastern Pyrénées (France)

et al. 2017

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The way faults control upward fluid flow in nonmagmatic hydrothermal systems in extensional context is still unclear. In the Eastern Pyrénées, an alignment of twenty-nine hot springs (29 ∘ C to 73 ∘ C), along the normal Têt fault, offers the opportunity to study this process. Using an integrated multiscale geological approach including mapping, remote sensing, and macro-and microscopic analyses of fault zones, we show that emergence is always located in crystalline rocks at gneiss-metasediments contacts, mostly in the Têt fault footwall. The hot springs distribution is related to high topographic reliefs, which are associated with fault throw and segmentation. In more detail, emergence localizes either (1) in brittle fault damage zones at the intersection between the Têt fault and subsidiary faults or (2) in ductile faults where dissolution cavities are observed along foliations, allowing juxtaposition of metasediments. Using these observations and 2D simple numerical simulation, we propose a hydrogeological model of upward hydrothermal flow. Meteoric fluids, infiltrated at high elevation in the fault footwall relief, get warmer at depth because of the geothermal gradient. Topography-related hydraulic gradient and buoyancy forces cause hot fluid rise along permeability anisotropies associated with lithological juxtapositions, fracture, and fault zone compositions.

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The Syabru‐Bensi hydrothermal system in central Nepal: 1. Characterization of carbon dioxide and radon fluxes

et al. 2014

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The Syabru-Bensi hydrothermal system (SBHS), located at the Main Central Thrust zone in central Nepal, is characterized by hot (30-62°C) water springs and cold (<35°C) carbon dioxide (CO 2 ) degassing areas. From 2007 to 2011, five gas zones (GZ1-GZ5) were studied, with more than 1600 CO 2 and 850 radon flux measurements, with complementary self-potential data, thermal infrared imaging, and effective radium concentration of soils. Measurement uncertainties were evaluated in the field. CO 2 and radon fluxes vary over 5 to 6 orders of magnitude, reaching exceptional maximum values of 236 ± 50 kg m À2 d À1 and 38.5 ± 8.0 Bq m À2 s À1 , with estimated integrated discharges over all gas zones of 5.9 ± 1.6 t d À1 and 140 ± 30 MBq d À1 , respectively. Soil-gas radon concentration is 40 × 10 3 Bq m À3 in GZ1-GZ2 and 70 × 10 3 Bq m À3 in GZ3-GZ4. Strong relationships between CO 2 and radon fluxes in all gas zones (correlation coefficient R = 0.86 ± 0.02) indicate related gas transport mechanisms and demonstrate that radon can be considered as a relevant proxy for CO 2 . CO 2 carbon isotopic ratios (δ 13 C from À1.7 ± 0.1 to À0.5 ± 0.1‰), with the absence of mantle signature (helium isotopic ratios R/R A < 0.05), suggest metamorphic decarbonation at depth. Thus, the SBHS emerges as a unique geosystem with significant deep origin CO 2 discharge located in a seismically active region, where we can test methodological issues and our understanding of transport properties and fluid circulations in the subsurface.

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Hydrothermal heat flow near the Main Central Thrust, central Nepal Himalaya

Cited by 45 publications

References 43 publications

Evidence for Pleistocene Low-Angle Normal Faulting in the Annapurna-Dhaulagiri Region, Nepal

Evidence for Pleistocene Low-Angle Normal Faulting in the Annapurna-Dhaulagiri Region, Nepal

Fault-Related Controls on Upward Hydrothermal Flow: An Integrated Geological Study of the Têt Fault System, Eastern Pyrénées (France)

The Syabru‐Bensi hydrothermal system in central Nepal: 1. Characterization of carbon dioxide and radon fluxes

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