Quantifying erosion rates in the Molasse basin using a high resolution data set and a new thermal model

Hagke, Christoph von; Lujiendjik, E; Ondrak, Robert; Lindow, Julia

doi:10.1127/1864-5658/2015-36

Cited by 7 publications

(10 citation statements)

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“…Formation tops in depth were taken from the GEN-1 well. Qualitative mechanical stratigraphy (Fischer, 1960;Müller, 1970;Budach et al, 2017) and the location of inferred detachments (Bachmann et al, 1982;Müller et al, 1988;Ortner et al, 2015;von Hartmann et al, 2016) are also indicated. Mapped seismic horizons, and the stratal units they bound, are depicted in the right column.…”

Section: Databasementioning

confidence: 99%

“…von Hartmann et al (2016). Figure 3 shows also inferred locations of detachment horizons (Bachmann et al, 1982;Müller et al, 1988;Ortner et al, 2015;von Hartmann et al, 2016). Unit 1 corresponds to the Upper Jurassic carbonate platform that has a heterogeneous, low-frequency seismic expression.…”

Section: Seismic Stratigraphymentioning

confidence: 99%

“…The increasing interest in geothermal exploitation in recent years, and therefore the acquisition of 3-D seismic V. Shipilin et al: Multiphase, decoupled faulting in the Molasse Basin data, has allowed more detailed studies of the complexly deformed areas (e.g. Lüschen et al, 2011;von Hartmann et al, 2016;Budach et al, 2017). Nevertheless, the tectonic and stratigraphic factors controlling the evolution of the structure of the German Molasse Basin have not been fully described as yet.…”

Section: Introductionmentioning

confidence: 99%

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Multiphase, decoupled faulting in the southern German Molasse Basin – evidence from 3-D seismic data

et al. 2020

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Abstract. We use three-dimensional seismic reflection data from the southern German Molasse Basin to investigate the structural style and evolution of a geometrically decoupled fault network in close proximity to the Alpine deformation front. We recognise two fault arrays that are vertically separated by a clay-rich layer – lower normal faults and upper normal and reverse faults. A frontal thrust fault partially overprints the upper fault array. Analysis of seismic stratigraphy, syn-kinematic strata, throw distribution, and spatial relationships between faults suggest a multiphase fault evolution: (1) initiation of the lower normal faults in the Upper Jurassic carbonate platform during the early Oligocene, (2) development of the upper normal faults in the Cenozoic sediments during the late Oligocene, and (3) reverse reactivation of the upper normal faults and thrusting during the mid-Miocene. These distinct phases document the evolution of the stress field as the Alpine orogen propagated across the foreland. We postulate that interplay between the horizontal compression and vertical stresses due to the syn-sedimentary loading resulted in the intermittent normal faulting. The vertical stress gradients within the flexed foredeep defined the independent development of the upper faults above the lower faults, whereas mechanical behaviour of the clay-rich layer precluded the subsequent linkage of the fault arrays. The thrust fault must have been facilitated by the reverse reactivation of the upper normal faults, as its maximum displacement and extent correlate with the occurrence of these faults. We conclude that the evolving tectonic stresses were the primary mechanism of fault activation, whereas the mechanical stratigraphy and pre-existing structures locally governed the structural style.

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Section: Databasementioning

confidence: 99%

Section: Seismic Stratigraphymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multiphase, decoupled faulting in the southern German Molasse Basin – evidence from 3-D seismic data

et al. 2020

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“…However, these models do not include the thermal effects of groundwater flow, despite indications that groundwater flow often influences temperatures in the upper crust and thermochronological datasets (Ehlers, 2005;Ferguson and Grasby, 2011). A model study by Whipp and Ehlers (2007) forms an exception and demonstrated that diffuse topography-driven groundwater flow can strongly affect low-temperature thermochronometers in mountain belts.…”

Section: Introductionmentioning

confidence: 99%

Beo v1.0: numerical model of heat flow and low-temperature thermochronology in hydrothermal systems

Luijendijk

2019

Geosci. Model Dev.

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Abstract. Low-temperature thermochronology can provide records of the thermal history of the upper crust and can be a valuable tool to quantify the history of hydrothermal systems. However, existing model codes of heat flow around hydrothermal systems do not include low-temperature thermochronometer age predictions. Here I present a new model code that simulates thermal history around hydrothermal systems on geological timescales. The modelled thermal histories are used to calculate apatite (U–Th)∕He (AHe) ages, which is a thermochronometer that is sensitive to temperatures up to 70 ∘C. The modelled AHe ages can be compared to measured values in surface outcrops or borehole samples to quantify the history of hydrothermal activity. Heat flux at the land surface is based on equations of latent and sensible heat flux, which allows more realistic land surface and spring temperatures than models that use simplified boundary conditions. Instead of simulating fully coupled fluid and heat flow, the code only simulates advective and conductive heat flow, with the rate of advective fluid flux specified by the user. This relatively simple setup is computationally efficient and allows running larger numbers of models to quantify model sensitivity and uncertainty. Example case studies demonstrate the sensitivity of hot spring temperatures to the depth, width and angle of permeable fault zones, and the effect of hydrothermal activity on AHe ages in surface outcrops and at depth.

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“…(1 × 10 −4 m a −1 ) and moderate exhumation rates representing orogens (1 × 10 −3 m a −1 ) (Herman et al, 2013). Exhumation rates in the northern part of the Molasse Basin where the springs are located is still under debate, but equal approximately 1.5 km over the last 5 million years (Cederbom et al, 2011) or 12 million years (von Hagke et al, 2015) (1 − 3 × 10 4 m a −1 ) .…”

mentioning

confidence: 99%

Beo v1.0: Numerical model of heat flow and low-temperature thermochronology in hydrothermal systems

Luijendijk¹

2019

Preprint

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Low-temperature thermochronology can provide records of the thermal history of the upper crust and can be a valuable tool to quantify the history of hydrothermal systems. However, existing model codes of heat flow around hydrothermal systems do not include low-temperature thermochronology. Here I present a new model code that simulates thermal history around hydrothermal systems on geological timescales. The modelled thermal histories are used to calculate apatite (U-Th)/He (AHe) ages, which is a thermochronometer that is sensitive to temperatures up to 70°C. The modelled AHe ages can be 5 compared to measured values in surface outcrops or borehole samples to quantify the history of hydrothermal activity. Heat flux at the land surface is based on equations of latent and sensible heat flux, which allows more realistic land surface and spring temperatures than models that use simplified boundary conditions. Instead of simulating fully coupled fluid and heat flow, the code only simulates advective and conductive heat flow, with the rate of advective fluid flux specified by the user. This relatively simple setup is computationally efficient and allows running larger numbers of models to quantify model sensitivity 10 and uncertainty. Example case studies demonstrate the sensitivity of hot spring temperatures to the depth, width and angle of permeable fault zones, and the effect of hydrothermal activity on AHe ages in surface outcrops and at depth.

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Quantifying erosion rates in the Molasse basin using a high resolution data set and a new thermal model

Cited by 7 publications

References 0 publications

Multiphase, decoupled faulting in the southern German Molasse Basin – evidence from 3-D seismic data

Multiphase, decoupled faulting in the southern German Molasse Basin – evidence from 3-D seismic data

Beo v1.0: numerical model of heat flow and low-temperature thermochronology in hydrothermal systems

Beo v1.0: Numerical model of heat flow and low-temperature thermochronology in hydrothermal systems

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