Late Miocene Thermal Evolution of the Eastern Himalayan Syntaxis as Constrained by Biotite<sup>40</sup>Ar/<sup>39</sup>Ar Thermochronology

Gong, Jing‐Xu; Ji, Jianqing; Zhou, Jing; Tu, Jiyao; Zhong, Dingkun; Han, Bao‐Fu

doi:10.1086/682951

Cited by 16 publications

(8 citation statements)

References 28 publications

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“…Our model also shed light on the non-steady state exhumation rate of the EHS region since ∼10 Ma (e.g., Gong et al, 2015;Govin et al, 2020;King et al, 2016;Lang et al, 2016;Yang et al, 2021). Govin et al (2020) shows that the exhumation rates increased significantly from 4 km/Myr at 8 Ma to 9 km/Myr at 2 Ma.…”

Section: Implications For the Eastern Himalayan Syntaxis Evolutionmentioning

confidence: 62%

“…45 to 24 Ma Palin et al., 2015; Su et al., 2012) that is probably associated with a regional magmatic flare‐up (Ma et al., 2022; Su et al., 2012). In this sense, the granulite facies metamorphism is not related to the exhumation of the EHS that only started since ∼10 Ma (e.g., Ding et al., 2001; Gong et al., 2015).…”

Section: Implications For the Eastern Himalayan Syntaxis Evolutionmentioning

confidence: 99%

“…Spatially, the high exhumation rate or erosion rate is characterized by a focused "bullseye" pattern with a diameter of ∼50 km (Bracciali et al, 2016;King et al, 2016) (Figure 1c). Recent studies show the exhumation rate of the EHS has not been uniform since ∼10 Ma (e.g., Gong et al, 2015;Govin et al, 2020). Govin et al (2020) suggested the exhumation accelerated to ∼4 km/Myr at ∼8 Ma and ∼9 km/ Myr after ∼2 Ma based on multisystem detrital thermochronology.…”

Section: Implications For the Eastern Himalayan Syntaxis Evolutionmentioning

confidence: 99%

“…Numerous studies on medium to low‐temperature thermochronology (e.g., biotite and hornblende 40 Ar/ 39 Ar ages, zircon and apatite (U‐Th)/He and fission track ages have revealed that the EHS has been rapidly exhuming (2–10 km/Myr) since Late Miocene‐Pliocene (e.g., Bracciali et al., 2016; Burg et al., 1997; Burg et al., 1998; Ding et al., 2001; Enkelmann et al., 2011; Gong et al., 2015; Govin et al., 2020; Lang et al., 2016; Seward & Burg, 2008; Yang et al., 2018). Spatially, the high exhumation rate or erosion rate is characterized by a focused “bullseye” pattern with a diameter of ∼50 km (Bracciali et al., 2016; King et al., 2016) (Figure 1c).…”

Section: Implications For the Eastern Himalayan Syntaxis Evolutionmentioning

confidence: 99%

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Erosion‐Driven Isostatic Flow and Crustal Diapirism: Analytical and Numerical Models With Implications for the Evolution of the Eastern Himalayan Syntaxis, Southern Tibet

Yang,

Cao,

Yuan

et al. 2023

Tectonics

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The Eastern Himalayan Syntaxis (EHS) is one of the fastest exhuming regions on Earth since ∼10 Ma, and the mechanism of its fast exhumation is under debate. Different from many other studies based on tectonics‐driven models, we performed analytical analysis and numerical simulations to investigate an erosion‐driven system. Our results show that fast and focused surface erosion alone is able to exhume the lower crust on the timescale of ∼10 Myr. This process leads to the formation of a domal structure, an elevated geothermal gradient, rapid cooling of crustal rocks, and decompression melting in the lower crust. In the upper‐mid crust, the uplift of crustal rocks is caused by isostatic flow driven by pressure gradient, whose rate is limited by the driving erosional forcing. In the mid‐lower crust where decompression melting occurs, rocks entrained in a buoyant diapir experience fast uplift rate exceeding the erosional forcing. Our erosion‐driven model demonstrates an intricate coupling between surface erosion and crustal processes. Positive feedback between surface erosion and rock uplift is possible under certain conditions and crustal diapirism plays a key role in the feedback. Our study shows that both isostatic and diapiric flows play important roles in the uplift and exhumation of crustal rocks in the EHS. We highlight that erosion‐driven crustal diapirism can be one of the missing pieces explaining the evolution of the Eastern Himalayan Syntaxis.

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Section: Implications For the Eastern Himalayan Syntaxis Evolutionmentioning

confidence: 62%

Section: Implications For the Eastern Himalayan Syntaxis Evolutionmentioning

confidence: 99%

Section: Implications For the Eastern Himalayan Syntaxis Evolutionmentioning

confidence: 99%

Section: Implications For the Eastern Himalayan Syntaxis Evolutionmentioning

confidence: 99%

See 2 more Smart Citations

Erosion‐Driven Isostatic Flow and Crustal Diapirism: Analytical and Numerical Models With Implications for the Evolution of the Eastern Himalayan Syntaxis, Southern Tibet

Yang,

Cao,

Yuan

et al. 2023

Tectonics

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“…For a portion of the gorge, the biotite 40 Ar/ 39 Ar annealing age is much greater than 2 Ma (Fig. 1B) (Gong et al, 2008(Gong et al, , 2015Seward and Burg, 2008). This is outside of the time scale of our discussion.…”

Section: Erodibility Kmentioning

confidence: 65%

How a stationary knickpoint is sustained: New insights into the formation of the deep Yarlung Tsangpo Gorge

et al. 2017

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In order to test the hypothesis that the stationary nature of the Yarlung Tsangpo Gorge is tectonically controlled, the rock uplift pattern in the southeast Tibetan Plateau and the critical condition to sustain a stable knickpoint must be derived. Via slope-area analysis and the integral approach, we first quantify the pattern of channel steepness in southeast Tibet and find that the steepness index shows higher values around the gorge but lower values toward the inner land and the mountain front. Such a pattern of channel steepness indicates that the active rock uplift is restricted in the zone just around the Yarlung Tsangpo Gorge. Then, we derive a general knickpoint migration model that accounts for spatially variant rock uplift rates. From the model, a critical condition for maintaining a stable knickpoint is concluded that the difference of incision rates in the downstream and upstream reaches of the knickpoint should match that of rock uplift. Employing a streampower river incision model, we calculate the incision rate in the gorge and find a higher correspondence with differential rock uplift rates in the downstream and upstream reaches of the knickpoint. Therefore, we favor tectonic control as the primary mechanism to explain the stability of the knickpoint within the Yarlung Tsangpo Gorge.

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Phased cooling of the Siang antiform, Eastern Himalaya: Insight from multi-thermochronology and thermal studies

et al. 2021

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Late Miocene Thermal Evolution of the Eastern Himalayan Syntaxis as Constrained by Biotite⁴⁰Ar/³⁹Ar Thermochronology

Cited by 16 publications

References 28 publications

Erosion‐Driven Isostatic Flow and Crustal Diapirism: Analytical and Numerical Models With Implications for the Evolution of the Eastern Himalayan Syntaxis, Southern Tibet

Erosion‐Driven Isostatic Flow and Crustal Diapirism: Analytical and Numerical Models With Implications for the Evolution of the Eastern Himalayan Syntaxis, Southern Tibet

How a stationary knickpoint is sustained: New insights into the formation of the deep Yarlung Tsangpo Gorge

Phased cooling of the Siang antiform, Eastern Himalaya: Insight from multi-thermochronology and thermal studies

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Late Miocene Thermal Evolution of the Eastern Himalayan Syntaxis as Constrained by Biotite40Ar/39Ar Thermochronology

Cited by 16 publications

References 28 publications

Erosion‐Driven Isostatic Flow and Crustal Diapirism: Analytical and Numerical Models With Implications for the Evolution of the Eastern Himalayan Syntaxis, Southern Tibet

Erosion‐Driven Isostatic Flow and Crustal Diapirism: Analytical and Numerical Models With Implications for the Evolution of the Eastern Himalayan Syntaxis, Southern Tibet

How a stationary knickpoint is sustained: New insights into the formation of the deep Yarlung Tsangpo Gorge

Phased cooling of the Siang antiform, Eastern Himalaya: Insight from multi-thermochronology and thermal studies

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Late Miocene Thermal Evolution of the Eastern Himalayan Syntaxis as Constrained by Biotite⁴⁰Ar/³⁹Ar Thermochronology