scholarly journals New Detrital Apatite Fission Track Thermochronological Constraints on the Meso-Cenozoic Tectono-Thermal Evolution of the Micangshan-Dabashan Tectonic Belt, Central China

2021 ◽  
Vol 9 ◽  
Author(s):  
Tao Tian ◽  
Peng Yang ◽  
Jianming Yao ◽  
Zhonghui Duan ◽  
Zhanli Ren ◽  
...  
Keyword(s):  
Fission Track ◽  
Central China ◽  
Accelerated Cooling ◽  
Lateral Migration ◽  
Apatite Fission Track ◽  
Dabie Orogen ◽  
Tectonic Zone ◽  
Rapid Cooling ◽  
Coupling Process ◽  
Tectonic Belt

The Micangshan-Dabashan tectonic belt, located in the southern Qinling-Dabie Orogen near the northeastern Tibetan Plateau, is a crucial area for understanding the processes and mechanisms of orogenesis. Previous studies have been focused on the cooling process via thermochronology and the mechanism and process of basement uplift have been investigated. However, the coupling process of basement exhumation and sedimentary cap cooling is unclear. The tectono-thermal history constrained by the detrital apatite fission track (AFT) results could provide valuable information for understanding crustal evolution and the coupling process. In this study, we provided new detrital AFT thermochronology results from the Micangshan-Dabashan tectonic belt and obtained nine high-quality tectono-thermal models revealing the Meso-Cenozoic cooling histories. The AFT ages and lengths suggest that the cooling events in the Micangshan area were gradual from north (N) to south (S) and different uplift occurred on both sides of Micangshan massif. The cooling in Dabashan tectonic zone was gradual from northeast (NS) to southwest (SW). The thermal histories show that a relatively rapid cooling since ca. 160 Ma occurred in the Micangshan-Dabashan tectonic belt, which was a response to the event of Qinling orogenic belt entered the intracontinental orogenic deformation. This cooling event may relate to the northeastward dextral compression of the Yangtze Block. The sedimentary cap of Cambriano-Ordovician strata responded positively to this rapid cooling event and entered the PAZ since ca. 63 Ma. The deep buried samples may be limited affected by climate and water erosion and the accelerated cooling was not obvious in the Late Cenozoic. Collectively, the cooling processes of basement and sedimentary cap in Micangshan-Dabashan tectonic belt were inconsistent. The uplift of the sedimentary area is not completely consistent with that of the basement under thrust and nappe action. The rigid basement was not always continuous and rapidly uplifted or mainly showed as lateral migration in a certain stage because of the different intensities and modes of thrust and nappe action, and the plastic sedimentary strata rapidly uplifted due to intense folding deformation.

scholarly journals Evolução Paleotopográfica da Margem Continental Brasileira durante o Fanerozoico: Evidências a partir da Termocronologia por Traços de Fissão em Apatitas (Paleotopographic Evolution of the Brazilian Continental Margin during the Phanerozoic: Evidence from Apatite Fission Track Thermochronology)

2019 ◽  
Vol 12 (4) ◽  
pp. 1670
Author(s):  
Andrea Ritter Jelinek
Keyword(s):  
Continental Margin ◽  
Fission Track ◽  
Sedimentary Basins ◽  
Shear Zones ◽  
Lower Jurassic ◽  
Accelerated Cooling ◽  
Apatite Fission Track ◽  
Serra Do Mar ◽  
Denudation Rates ◽  
Fission Track Thermochronology

Este trabalho explora banco de dados traços de fissão em apatitas com o objetivo de desenvolver uma visão sinóptica de padrões de denudação através do espaço-tempo na margem continental brasileira. A resposta geomorfológica aos processos de rifteamento e ruptura continental variou ao longo da margem continental brasileira. No processo de construção do relevo desta margem foram registrados três episódios de resfriamento acelerado, que são vinculados a processos denudacionais: Cretáceo Inferior, Cretáceo Superior e Paleógeno-Neógeno. As margens continentais sudeste e leste apresentam uma morfologia de margem continental passiva característica, com as bacias sedimentares offshore separadas da região continental elevada, composta pelas Serra do Mar e da Serra da Mantiqueira, por uma planície costeira relativamente estreita. As idades de soerguimento são mais jovens do que a idade do rifteamento. O resfriamento do Paleógeno-Neógeno é resultado do aumento nas taxas de denudação, que são relacionados à formação e reativação de blocos de falha de alto ângulo que se moveram em resposta às tensões intraplaca. A região do Arco de Ponta Grossa apresenta o relevo mais jovem de toda a margem, sendo um alto topográfico associado ao magmatismo Paraná-Etendeka e limitado por zonas de cisalhamento. Duas porções da margem apresentam relevo diferenciado, com episódios de denudação pré-rifte. A Depressão Sertaneja, na margem nordeste, típica região semi-árida do nordeste caracterizada como um pediplano, com vales estreitos e vertentes dissecadas, com resfriamento do Permiano-Jurássico Inferior; e a margem sul, local com topografia baixa, e soerguimento lento e contínuo do Paleozoico.A B S T R A C TThis study explores apatite fission track database with the objective of developing a synoptic view of denudation patterns across space and time in the Brazilian continental margin. The geomorphological response to the continental rift and rupture processes varied along the Brazilian continental margin. In the construction of the relief of this margin were recorded three episodes of accelerated cooling, which are linked to denudational processes: Lower Cretaceous, Upper Cretaceous and Paleogene-Neogene episodes. The southeast and eastern continental margin presents a characteristic passive continental margin morphology, with the offshore sedimentary basins separated from the elevated continental region, Serra do Mar and Serra da Mantiqueira, for a relatively narrow coastal plain. The uplifting ages are younger than the rift age. Accelerated cooling during Paleogene-Neogene is a result of increased denudation rates, which are related to the formation and reactivation of high angle fault blocks that have moved in response to intraplate stresses. The region of the Ponta Grossa Arch presents the youngest relief of the entire continental margin. It is a high topographic associated with Paraná-Etendeka magmatism and limited by shear zones. There are two parts of the continental margin with differentiated relief, which present episodes of pre-rift denudation. The Sertaneja Depression, in the northeast margin, a typical semi-arid northeast region characterized as a pediplane, with narrow valleys and dissected slopes, where occurs a Permian-Lower Jurassic cooling episode; and the south continental margin, where the topography is relatively, registering a slow and continuous uplift during the Paleozoic. Keywords: Paleotopography, rift continental margin, apatite fission tracks

Fast extension but little exhumation: the Vari detachment in the Cyclades, Greece

2003 ◽  
Vol 140 (3) ◽  
pp. 245-252 ◽  
Author(s):  
UWE RING ◽  
STUART N. THOMSON ◽  
MICHAEL BRÖCKER
Keyword(s):  
Late Cretaceous ◽  
Fission Track ◽  
Regional Scale ◽  
Slip Rate ◽  
Aegean Sea ◽  
Apatite Fission Track ◽  
Rapid Cooling ◽  
Magmatic Arc ◽  
Zircon Fission Track

Markedly different cooling histories for the hanging- and footwall of the Vari detachment on Syros and Tinos islands, Greece, are revealed by zircon and apatite fission-track data. The Vari/Akrotiri unit in the hangingwall cooled slowly at rates of 5–15 °C Myr−1 since Late Cretaceous times. Samples from the Cycladic blueschist unit in the footwall of the detachment on Tinos Island have a mean zircon fission-track age of 10.0±1.0 Ma, which together with a published mean apatite fission-track age of 9.4±0.5 Ma indicates rapid cooling at rates of at least ∼60 °C Myr−1. We derive a minimum slip rate of ∼6.5 km Myr−1 and a displacement of <∼20 km and propose that the development of the detachment in the thermally softened magmatic arc aided fast displacement. Intra-arc extension accomplished the final ∼6–9 km of exhumation of the Cycladic blueschists from ∼60 km depth. The fast-slipping intra-arc detachments did not cause much exhumation, but were important for regional-scale extension and the formation of the Aegean Sea.

scholarly journals Tectonic Evolution of the SE West Siberian Basin (Russia): Evidence from Apatite Fission Track Thermochronology of Its Exposed Crystalline Basement

Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 604
Author(s):  
Evgeny V. Vetrov ◽  
Johan De Grave ◽  
Natalia I. Vetrova ◽  
Fedor I. Zhimulev ◽  
Simon Nachtergaele ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Fission Track ◽  
Analytical Data ◽  
Tectonic Activity ◽  
Apatite Fission Track ◽  
Tectonic Processes ◽  
Basement Rocks ◽  
Fission Track Thermochronology ◽  
History Of ◽  
West Siberian Basin

The West Siberian Basin (WSB) is one of the largest intracratonic Meso-Cenozoic basins in the world. Its evolution has been studied over the recent decades; however, some fundamental questions regarding the tectonic evolution of the WSB remain unresolved or unconfirmed by analytical data. A complete understanding of the evolution of the WSB during the Mesozoic and Cenozoic eras requires insights into the cooling history of the basement rocks as determined by low-temperature thermochronometry. We presented an apatite fission track (AFT) thermochronology study on the exposed parts of the WSB basement in order to distinguish tectonic activation episodes in an absolute timeframe. AFT dating of thirteen basement samples mainly yielded Cretaceous cooling ages and mean track lengths varied between 12.8 and 14.5 μm. Thermal history modeling based on the AFT data demonstrates several Mesozoic and Cenozoic intracontinental tectonic reactivation episodes affected the WSB basement. We interpreted the episodes of tectonic activity accompanied by the WSB basement exhumation as a far-field effect from tectonic processes acting on the southern and eastern boundaries of Eurasia during the Mesozoic–Cenozoic eras.

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