Differential erosion of a Mesozoic rift flank: Establishing the source of topography across Karrat, central West Greenland

Jess, Scott; Stephenson, Randell; Roberts, David H.; Brown, R. W.

doi:10.1016/j.geomorph.2019.02.026

Cited by 16 publications

(13 citation statements)

References 82 publications

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“…Across the continental margins of Baffin Bay and the Labrador Sea AFT and AHe ages appear similar to those reported here (Hendriks et al, 1993;Japsen et al, 2006;McDannell et al, 2019;Jess et al 2019), while the interpretation of rift related uplift and differential erosion shaping the landscape is comparable (Hendriks et al, 1993;Jess et al 2019). AFT data from both Newfoundland and West Greenland are interpreted to suggest the modern topography is the result of rift-related uplift (Hendriks et al, 1993;Jess et al, 2019), while low rates of exhumation during the Cenozoic are inferred from thermal modelling of both AFT and AHe data (Jess et al 2018). Collectively this suggests much of the topography observed across the wider region is likely the result of preserved rift-related uplift, such that both margins have evolved according to a single unifying conceptual model that does not require the intervention of post-rift uplift.…”

Section: Implications For Atlantic Continental Marginssupporting

confidence: 89%

The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank

Jess

Stephenson

Nielsen

et al. 2019

JGS

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Elevated topography is evident across the continental margins of the Atlantic. The Cumberland Peninsula, Baffin Island, formed as the result of rifting along the Labrador-Baffin margins in the late Mesozoic and is dominated by low relief high elevation topography. Apatite fission track (AFT) analysis of the landscape previously concluded that the area has experienced a differential protracted cooling regime since the Devonian; however, defined periods of cooling and the direct causes of exhumation were unresolved. This work combines the original AFT data with 98 apatite new (U-Th)/He ages from 16 samples and applies the newly developed 'broken crystals' technique to provide a greater number of thermal constraints for thermal history modelling to better constrain the topographic evolution. The spatial distribution of AFT and AHe ages implies exhumation has been significant toward the SE (Labrador) coastline, while results of thermal modelling outline three notable periods of cooling in the pre-rift (460 Ma-200 Ma), from syn-rift to present (120 Ma-0 Ma) and within post-rift (30 Ma-0 Ma) stages. Pre-rift cooling is interpreted as the result of exhumation of Laurentia, syn-rift cooling as the result of rift flank uplift to the SE and

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Section: Implications For Atlantic Continental Marginssupporting

confidence: 89%

The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank

Jess

Stephenson

Nielsen

et al. 2019

JGS

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“…Low‐temperature thermochronometry provides new perspectives on the relative importance of lithospheric flexure, isostasy, and structural inheritance controlling escarpment development and degradation. Examples of FT and (U–Th)/He thermochronometry applications to passive margins include southern Africa (Brown et al, , ; Brown et al, ; Cockburn et al, ; Flowers & Schoene, ; Gallagher & Brown, ; Kounov et al, ; Tinker et al, ; Wildman et al, ), Fennoscandia (Hendriks & Redfield, ), Brazil (Gallagher et al, ; Hackspacher et al, ), and Baffin Island and West Greenland (Japsen et al, ; Jess et al, ; Jess et al, ).…”

Section: Low‐temperature Thermochronometry Applicationsmentioning

confidence: 99%

Innovations in (U–Th)/He, Fission Track, and Trapped Charge Thermochronometry with Applications to Earthquakes, Weathering, Surface‐Mantle Connections, and the Growth and Decay of Mountains

2019

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A transformative advance in Earth science is the development of low‐temperature thermochronometry to date Earth surface processes or quantify the thermal evolution of rocks through time. Grand challenges and new directions in low‐temperature thermochronometry involve pushing the boundaries of these techniques to decipher thermal histories operative over seconds to hundreds of millions of years, in recent or deep geologic time and from the perspective of atoms to mountain belts. Here we highlight innovation in bedrock and detrital fission track, (U–Th)/He, and trapped charge thermochronometry, as well as thermal history modeling that enable fresh perspectives on Earth science problems. These developments connect low‐temperature thermochronometry tools with new users across Earth science disciplines to enable transdisciplinary research. Method advances include radiation damage and crystal chemistry influences on fission track and (U–Th)/He systematics, atomistic calculations of He diffusion, measurement protocols and numerical modeling routines in trapped charge systematics, development of 4He/3He and new (U–Th)/He thermochronometers, and multimethod approaches. New applications leverage method developments and include quantifying landscape evolution at variable temporal scales, changes to Earth's surface in deep geologic time and connections to mantle processes, the spectrum of fault processes from paleoearthquakes to slow slip and fluid flow, and paleoclimate and past critical zone evolution. These research avenues have societal implications for modern climate change, groundwater flow paths, mineral resource and petroleum systems science, and earthquake hazards.

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“…Low‐temperature thermochronology uses the temperature dependent accumulation of radioactive decay products in minerals, such as apatite and zircon, to determine a rock’s thermal history (e.g., Farley, 2002; Gallagher et al., 1998). This approach is applied to a variety of geological problems to resolve the thermal histories of low temperature systems (<250°C), such as exhumation, near‐surface tectonics, volcanism and shifts in climate (e.g., Bernard et al., 2016; Heineke et al., 2019; Jess et al., 2019; Karlstrom et al., 2019). Apatite (U‐Th‐Sm)/He has been used in previous studies investigating the thermal histories of hot springs due to the system’s sensitivity to low temperatures (Gorynski et al., 2014; Louis et al., 2019; Milesi et al., 2019, 2020), though this has a limited temporal and thermal resolution and is prone to intra‐sample age dispersion.…”

Section: Methodsmentioning

confidence: 99%

“…Additional documented causes of age dispersion include helium implantation from surrounding minerals, micro-inclusions of U, Th, and Sm rich minerals, parent isotope zonation, grain chemistry and pre-depositional thermal histories in sedimentary samples (Djimbi et al, 2015;Flowers & Kelley, 2011;Fox & Shuster, 2014;Milesi et al, 2020;Spiegel et al, 2009;Vermeesch et al, 2007). As many of these issues cannot be implemented in thermal history models, it is common to include fission track analysis to resolve the higher temperature portion of the thermal history and improve modeling resolution (e.g., Blythe et al, 2000;Cogné et al, 2011;Jess et al, 2019;Reiners et al, 2003;Wildman et al, 2016).…”

Section: Low-temperature Thermochronologymentioning

confidence: 99%

Determining the Lifespan of Hydrothermal Systems Using Thermochronology and Thermal Modeling

et al. 2021

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Hydrothermal springs (or "hot springs") are the emergence of hot groundwater at the earth's surface (Pentecost et al., 2003;White, 1957). These springs reflect deep circulation of meteoric water that is heated in the upper ∼5 km of the earth's crust and are thought to reflect geothermal anomalies and zones of enhanced crustal permeability (Ferguson & Grasby, 2011;Grasby & Hutcheon, 2001). These systems offer vital information of a region's hydrological, climatic and tectonic histories (Gao et al., 2013;Grasby & Hutcheon, 2001;Lynne, 2012), providing important insight into the interaction between atmospheric and lithospheric processes at and near earth's surface. In recent decades, the desire to transition to carbon neutral electricity production has driven the exploration for geothermal energy resources as a form of renewable energy (Tester et al., 2006), and hydrothermal springs have been used to focus exploration activity. However, our understanding of hydrothermal springs remains incomplete, especially when considering the longevity and resilience of systems through major climatic and landscape changes (Skinner, 1997). In any energy system, the reliability of a resource is vital to the production of electricity and the lifespan of these geothermal

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Differential erosion of a Mesozoic rift flank: Establishing the source of topography across Karrat, central West Greenland

Cited by 16 publications

References 82 publications

The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank

The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank

Innovations in (U–Th)/He, Fission Track, and Trapped Charge Thermochronometry with Applications to Earthquakes, Weathering, Surface‐Mantle Connections, and the Growth and Decay of Mountains

Determining the Lifespan of Hydrothermal Systems Using Thermochronology and Thermal Modeling

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