scholarly journals Diachronous low-temperature Paleogene cooling of the Alberni Inlet area, southern Vancouver Island, British Columbia: evidence from apatite fission track analyses

1996 ◽  
Author(s):  
L D Currie ◽  
A M Grist
Keyword(s):  
British Columbia ◽  
Low Temperature ◽  
Fission Track ◽  
Vancouver Island ◽  
Apatite Fission Track

scholarly journals Apatite fission track data for seventeen rock samples from the Bowser and Sustut basins, British Columbia

2009 ◽  
Author(s):  
P B O'Sullivan ◽  
C A Evenchick ◽  
K G Osadetz ◽  
F Ferri ◽  
R A Donelick
Keyword(s):  
British Columbia ◽  
Fission Track ◽  
Apatite Fission Track ◽  
Rock Samples

Resolving thermal histories via multi-kinetic apatite fission track data: A case study from Phanerozoic strata within the Peel Plateau NWT, Canada

2021 ◽  
Author(s):  
Jennifer Spalding ◽  
Jeremy Powell ◽  
David Schneider ◽  
Karen Fallas
Keyword(s):  
Low Temperature ◽  
Thermal History ◽  
Fission Track ◽  
Sedimentary Basins ◽  
Source Rocks ◽  
Apatite Fission Track ◽  
Petroleum Systems ◽  
History Of ◽  
Thermal Histories ◽  
Peel Plateau

<p>Resolving the thermal history of sedimentary basins through geological time is essential when evaluating the maturity of source rocks within petroleum systems. Traditional methods used to estimate maximum burial temperatures in prospective sedimentary basin such as and vitrinite reflectance (%Ro) are unable to constrain the timing and duration of thermal events. In comparison, low-temperature thermochronology methods, such as apatite fission track thermochronology (AFT), can resolve detailed thermal histories within a temperature range corresponding to oil and gas generation. In the Peel Plateau of the Northwest Territories, Canada, Phanerozoic sedimentary strata exhibit oil-stained outcrops, gas seeps, and bitumen occurrences. Presently, the timing of hydrocarbon maturation events are poorly constrained, as a regional unconformity at the base of Cretaceous foreland basin strata indicates that underlying Devonian source rocks may have undergone a burial and unroofing event prior to the Cretaceous. Published organic thermal maturity values from wells within the study area range from 1.59 and 2.46 %Ro for Devonian strata and 0.54 and 1.83 %Ro within Lower Cretaceous strata. Herein, we have resolved the thermal history of the Peel Plateau through multi-kinetic AFT thermochronology. Three samples from Upper Devonian, Lower Cretaceous and Upper Cretaceous strata have pooled AFT ages of 61.0 ± 5.1 Ma, 59.5 ± 5.2 and 101.6 ± 6.7 Ma, respectively, and corresponding U-Pb ages of 497.4 ± 17.5 Ma (MSWD: 7.4), 353.5 ± 13.5 Ma (MSWD: 3.1) and 261.2 ± 8.5 Ma (MSWD: 5.9). All AFT data fail the χ<sup>2</sup> test, suggesting AFT ages do not comprise a single statistically significant population, whereas U-Pb ages reflect the pre-depositional history of the samples and are likely from various provenances. Apatite chemistry is known to control the temperature and rates at which fission tracks undergo thermal annealing. The r<sub>mro</sub> parameter uses grain specific chemistry to predict apatite’s kinetic behaviour and is used to identify kinetic populations within samples. Grain chemistry was measured via electron microprobe analysis to derive r<sub>mro</sub> values and each sample was separated into two kinetic populations that pass the χ<sup>2</sup> test: a less retentive population with ages ranging from 49.3 ± 9.3 Ma to 36.4 ± 4.7 Ma, and a more retentive population with ages ranging from 157.7 ± 19 Ma to 103.3 ± 11.8 Ma, with r<sub>mr0</sub> benchmarks ranging from 0.79 and 0.82. Thermal history models reveal Devonian strata reached maximum burial temperatures (~165°C-185°C) prior to late Paleozoic to Mesozoic unroofing, and reheated to lower temperatures (~75°C-110°C) in the Late Cretaceous to Paleogene. Both Cretaceous samples record maximum burial temperatures (75°C-95°C) also during the Late Cretaceous to Paleogene. These new data indicate that Devonian source rocks matured prior to deposition of Cretaceous strata and that subsequent burial and heating during the Cretaceous to Paleogene was limited to the low-temperature threshold of the oil window. Integrating multi-kinetic AFT data with traditional methods in petroleum geosciences can help unravel complex thermal histories of sedimentary basins. Applying these methods elsewhere can improve the characterisation of petroleum systems.</p>

Application of Apatite Fission-track Dating to the Study of Porphyry Type Mineral Deposits

1973 ◽  
Vol 10 (6) ◽  
pp. 846-851
Author(s):  
Peter A. Christopher
Keyword(s):  
British Columbia ◽  
Fission Track ◽  
Yukon Territory ◽  
Mineral Deposits ◽  
Fission Track Dating ◽  
Apatite Fission Track ◽  
Mountain Area ◽  
Thermal Event ◽  
Fission Track Ages ◽  
Apatite Fission Track Dating

Apatite fission-track ages for weakly altered rocks from the Syenite Range and Burwash Landing area of the Yukon Territory, and Cassiar area of British Columbia are shown to be consistent and generally concordant with K–Ar ages obtained on biotite from the same samples. More intensely altered rocks from Granisle Mine and the Copper Mountain area of British Columbia have discordant ages, due in part to alteration of apatite grains and, for samples from the Copper Mountain intrusions, to a Cretaceous (?) thermal event.

Thermomechanical models with surface processes: Low-Temperature Thermochronology predictions for model calibration

2020 ◽  
Author(s):  
Romain Beucher ◽  
Louis Moresi ◽  
Roderick Brown ◽  
Claire Mallard
Keyword(s):  
Low Temperature ◽  
Fission Track ◽  
Thermal Evolution ◽  
Surface Processes ◽  
Apatite Fission Track ◽  
Coupled Models ◽  
Passive Margins ◽  
Geomorphic Response ◽  
Mechanical Models ◽  
Thermal Histories

<p>State of the art thermo-mechanical models have become very efficient at testing scenarios of tectonic evolution but uncertainties on the rheologies and the complexity of the have so far limited the potential to quantitatively predict uplift and subsidence. Coupling thermo-mechanical models to landscape evolution models remains challenging and require careful validation and better integration of field data to prevent error in interpretation.</p><p> </p><p>Low temperature thermochronology has been extensively used to quantitatively constrain the thermal histories of rocks. It can provide important information on tectonic uplift (or subsidence) by measuring the erosional (or burial) response and can also map the spatial and temporal pattern of geomorphic response of a landscape.</p><p> </p><p>We use the temperature evolution of our coupled thermo-mechanical models with surface processes to predict Apatite fission track data (Ages and Track lengths distributions). The aim is to provide a direct means of comparison with actual empirical thermochronometric data which will allow different model scenarios and/or model parameter choices to be robustly tested.</p><p>We present a series of 3D coupled models (Underworld / Badlands) of Rifts and the associated Apatite Fission Track predicted by the thermal evolution of the rocks exhumed to the surface. We compare models predictions to existing thermochronological transects across passive margins.</p><p> </p><p>We discuss the technical challenges in obtaining sufficiently high resolution temperature field and other associated challenges that need to be addressed to satisfactory apply our model to natural examples.</p>

K–Ar and Fission Track Geochronometry of an Eocene Thermal Event in the Kettle River (West Half) Map Area, Southern British Columbia

1975 ◽  
Vol 12 (5) ◽  
pp. 836-843 ◽  
Author(s):  
G. A. Medford
Keyword(s):  
British Columbia ◽  
Abrupt Change ◽  
Fission Track ◽  
Apatite Fission Track ◽  
Thermal Event ◽  
South Central ◽  
Early Tertiary ◽  
Okanagan Valley

The Okanagan and Similkameen plutonic complexes west of the Okanagan Valley of south-central British Columbia yield K–Ar dates that range from 185 to 133 m.y. East of the Okanagan Valley Shuswap gneisses into which the plutonics intrude, and which may be as old as pre-midCarboniferous in age yield K–Ar dates between 59.9 and 47.4 m.y. This abrupt change, which approximately coincides with the Okanagan Valley, is a consequence of an intense thermal event in the early Tertiary which has reset K–Ar dates in the gneisses at shallow depths. Comparison of K–Ar, sphene and apatite fission track dates demonstrates that the heating affected the plutons west of the Okanagan Valley and that cooling of the Shuswap gneisses occurred at a rate in excess of 25 °C. per million years. The scatter observed in the older K–Ar dates of the plutonic complexes could be caused by post-emplacement heating with variable partial argon loss rather than by separate magmatic events. Thus, only the oldesl K–Ar dates obtained from the plutons may be significant as minimum ages for emplacement.

scholarly journals Supplemental Material: Low-temperature thermochronology constraints on the evolution of the Eastern Kunlun Range, northern Tibetan Plateau

2021 ◽  
Author(s):  
Chen Wu ◽  
et al.
Keyword(s):  
Tibetan Plateau ◽  
Low Temperature ◽  
Fission Track ◽  
Apatite Fission Track ◽  
Northern Tibetan Plateau

Table S1. Summary of the lower thermochronometry published dataset in the Eastern Kunlun Range. Figure S1. Apatite fission-track radial plots from RadialPlotter by Vermeesch (2009) of the study samples.

Late Miocene thermal history of the Hengchun Peninsula, Southern Taiwan: Apatite Fission-Track data from the Lilungshan Formation

2020 ◽  
Author(s):  
Shao-I Kao ◽  
Wen-Shan Chen ◽  
Tong Hin Chan
Keyword(s):  
Low Temperature ◽  
Late Miocene ◽  
Thermal History ◽  
Fission Track ◽  
Closure Temperature ◽  
Radiometric Dating ◽  
Low Grade ◽  
Apatite Fission Track ◽  
Fission Tracks ◽  
Southern Taiwan

<p>This study aims to investigate the thermal history regarding the Late Miocene Formation of the Hengchun Peninsula with low-temperature thermal chronometry. The samples used in our study were from Lilungshan Formation, which included quartzite (conglomerates) and sandstones (matrix). Lilungshan Formation was an upper fan or feeder channel deposits in shelf environments. Measurements of paleocurrent indicate that these rocks were transported from the NW to the SE, which may represent its source area is a low-grade metamorphic orogenic belt (Yuli belt). In the Late Miocene, outcrops of Yuli belt were low-grade metamorphic rocks with low metamorphic temperatures. To do so, low-temperature thermal chronometry was applied to measure the time since the Lilungshan Formation cooling below the closure temperature. Apatite Fission-track thermochronology is used in this study, which is a radiometric dating method that refers to thermal histories of rocks within the closure temperature range of 110–135°C.</p><p>Our study indicates that the pooled age of apatite fission tracks of conglomerates is 3.3–5 Ma and the grain ages of sandstones are below 5 Ma. Those ages are lower than the formation age of Lilungshan Formation (NN11, > 5.6 Ma). In addition, the grain ages spectrum of sandstones is partial annealing, which implies that the conglomerate has suffered from the thermal event and rapidly brought to the earth’s surface within 4 Ma. This study also compares data of previous studies with regard to the fission tracks of conglomerates in Southern Taiwan and confirms the existence of thermal events. With the assumption that the thermal gradient of the accretionary prism is 40–45°C/km, we can suggest that Lilungshan Formation was located 3 km below the earth's surface in roughly 4 Ma.</p><p> </p><p><strong>Keywords: </strong>Hengchun Peninsula, Lilungshan Formation, Apatite Fission Track, thermal history, chronometry, Late Miocene</p>

Low-temperature exhumation history of Variscan-age rocks in the western Cantabrian Mountains (NW Spain) recorded by apatite fission-track data

2010 ◽  
Vol 489 (1-4) ◽  
pp. 76-90 ◽  
Author(s):  
René W. Grobe ◽  
Joaquina Alvarez-Marrón ◽  
Ulrich A. Glasmacher ◽  
Rosana Menéndez-Duarte
Keyword(s):  
Low Temperature ◽  
Fission Track ◽  
Apatite Fission Track ◽  
Cantabrian Mountains ◽  
Nw Spain ◽  
History Of ◽  
Exhumation History

Thermo-tectonic imaging of the Afro-Arabian Rift System

2020 ◽  
Author(s):  
Samuel Boone ◽  
Fabian Kohlmann ◽  
Maria-Laura Balestrieri ◽  
Malcolm McMillan ◽  
Barry Kohn ◽  
...  
Keyword(s):  
Low Temperature ◽  
Red Sea ◽  
Fission Track ◽  
Normal Fault ◽  
Eastern Africa ◽  
Fault System ◽  
Rift System ◽  
Gulf Of Aden ◽  
Apatite Fission Track ◽  
Continental Scale

<p>Low-temperature thermochronology has long been utilised in the Afro-Arabian Rift System (AARS) to examine exhumation cooling histories of normal fault footwalls and elucidate rifting chronologies where datable syn-rift strata and/or markers are absent. In particular, apatite fission track (AFT) and (U-Th)/He (AHe) analyses have constrained the timing and rate of rift-related, upper crustal thermal perturbations between ~30 and 120 °C (up to ~5 km depth). In turn, these provide insights into the spatio-temporal evolution of individual rift basins, morphotectonic rift shoulder development, normal fault system growth and, in some cases, the thermal influence of igneous intrusions and circulation of hot fluids. However, the relatively limited number of samples and confined areas generally involved in individual case studies have precluded insights into longer wavelength tectonic and geodynamic phenomena, such as regional denudation trends and the growth of topography due to plume impingement.</p><p>Here, we present a synthesis of >2000 apatite fission track (AFT) and ~1000 (U-Th)/He (AHe) analyses from the Eocene-Recent AARS collated using LithoSurfer, a new cloud-based geoscience data platform. This continental-scale low-temperature thermochronology synthesis, the first of its kind in Africa, provides novel insights into the upper crustal evolution of the AARS that were previously difficult to decipher from an otherwise cumbersome and intractably large dataset. The data record a series of pronounced episodes of upper crustal cooling related to the development of the Red Sea, Gulf of Aden and East African Rift System (EARS). They also provide insights into the inherited tectono-thermal histories of these regions which controlled the spatial and temporal distribution of subsequent extensional strain.</p><p>Thermochronology data trends along the AARS reflect a combination of rift maturity, structural geometry and geothermal regime, intrinsically linked to lithospheric architecture and magmatic activity. These relationships are best illustrated by contrasting the upper crustal thermal evolution of different AARS segments of varying age and complexity: for example, between the nascent Okavango, mature Ethiopian and evolved Red Sea rifts, wide (e.g. Turkana Depression) versus narrow (e.g. Main Ethiopian Rift) zones of deformation, between areas of transtensional (Dead Sea Transform), oblique (e.g. Gulf of Aden) and sub-orthogonal rifting (e.g. Malawi Rift), and the magmatic eastern versus amagmatic western branches of the EARS.</p><p>A regional interpolation of standardised thermal history models generated from the mined AFT, AHe and, in some cases, vitrinite reflectance data yield Mesozoic-recent heat maps, extrapolated to produce paleo-denudation and burial histories for eastern Africa and Arabia. Integrating these thermotectonic images with other regional datasets allows for the interrelationship between tectonic and dynamic topography development, the denudation history of the land surface, and sediment transport and deposition to be explored in new ways.</p><p> </p>

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