Proterozoic–Mesozoic history of the Central Asian orogenic belt in the Tajik and southwestern Kyrgyz Tian Shan: U-Pb,<sup>40</sup>Ar/<sup>39</sup>Ar, and fission-track geochronology and geochemistry of granitoids

Käßner, Alexandra; Ratschbacher, Lothar; Pfänder, Jörg A.; Hacker, Bradley R.; Zack, George; Sonntag, Benita-Lisette; Khan, Jahanzeb; Stanek, Klaus; Gadoev, Mustafo; Oimahmadov, Ilhomjon

doi:10.1130/b31466.1

Cited by 44 publications

(81 citation statements)

References 112 publications

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“…The ~10 Ma AFT/AHe cooling signal confirms recent data by Kässner et al () and Carrapa et al. (), suggesting a phase of rapid cooling during the late Miocene.…”

Section: Discussionsupporting

confidence: 90%

“…Xiao et al., ; Li et al., ). Kässner et al () report a compilation of mica K–Ar and 40 Ar– 39 Ar data obtained to the west of our study area (Figure ), peaking at ~256–237 Ma. Hence, our data support Kässner et al.…”

Section: Discussionmentioning

confidence: 74%

“…Glorie & De Grave, ; Glorie et al., ; Hendrix et al., ; Macaulay et al., ; Sobel, Oskin, Burbank, & Mikolaichuk, ). In contrast, Kässner et al (,b) recently concluded that the western STS experienced tectonic quiescence between ~150 and 15 Ma (Figure ). This study targets a major structural contact, aiming to distinguish between these models and to refine the thermal history of the STS.…”

Section: Geological Backgroundmentioning

confidence: 92%

“…Geological map of the South Tian Shan and Pamirs modified after Vlasov, Dyakov, and Cherev () with published thermochronological data (Amidon & Hynek, ; Bande, Sobel, Mikolaichuk, & Acosta, ; Bande et al., ; De Grave et al., ; Kässner et al, , Kässner et al, ). The MPT = Main Pamir Thrust, and the red dashed line represents the Vakhsh‐Surkhob fault zone.…”

Section: Geological Backgroundmentioning

confidence: 99%

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Thermochronological insights into the structural contact between the Tian Shan and Pamirs, Tajikistan

et al. 2018

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Multi‐method thermochronology along the Vakhsh‐Surkhob fault zone reveals the thermotectonic history of the South Tian Shan–Pamirs boundary. Apatite U/Pb analyses yield a consistent age of 251 ± 2 Ma, corresponding to cooling below ~550–350°C, related to the final closure of the Palaeo‐Asian Ocean and contemporaneous magmatism in the South Tian Shan. Zircon (U–Th–Sm)/He ages constrain cooling below ~180°C to the end of the Triassic (~200 Ma), likely related either to deformation induced by the Qiangtang collision or to the closure of the Rushan Ocean. Apatite fission track thermochronology reveals two low‐temperature (<120°C) thermal events at ~25 Ma and ~10 Ma, which may be correlated with tectonic activity at the distant southern Eurasian margin. The late Miocene cooling is confirmed by apatite (U–Th–Sm)/He data and marks the onset of mountain building within the South Tian Shan that is ongoing today.

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“…The ~10 Ma AFT/AHe cooling signal confirms recent data by Kässner et al () and Carrapa et al. (), suggesting a phase of rapid cooling during the late Miocene.…”

Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 74%

Section: Geological Backgroundmentioning

confidence: 92%

Section: Geological Backgroundmentioning

confidence: 99%

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Thermochronological insights into the structural contact between the Tian Shan and Pamirs, Tajikistan

et al. 2018

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“…Xiao et al 2013). In the Kyrgyz part of the South Tien Shan, the presence of minor Devonian-age ophiolites (on the China map of Tien Wang et al 2007) may represent the westward continuation of the suture between the Tarim block and the Chinese South Tien Shan as suggested by Käßner et al (2017). To the west of the Talas -Fergana Fault, the small Gissar Ocean (e.g.…”

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confidence: 98%

Geological evolution of Central Asian Basins and the western Tien Shan Range

Brunet

Sobel

McCann³

2017

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The geological evolution of Central Asia commenced with the evolution of a complex Precambrian–Palaeozoic orogen. Cimmerian blocks were then accreted to the southern margin during the Mesozoic, leading to tectonic reactivation of older structures and discrete episodes of basin formation. The Indian and Arabian blocks collided with Asia during the Cenozoic, leading to renewed structural reactivation, intracontinental deformation and basin development. This complex evolution resulted in the present-day setting of an elongated Tien Shan range flanked by large Mesozoic–Cenozoic sedimentary basins with smaller intramontane basins distributed within the range. The aim of this volume is to present multidisciplinary results and reviews from research groups in Europe and Central Asia that focus on the western part of the Tien Shan and some of the large sedimentary basins in that area. These works elucidate the Late Palaeozoic–Cenozoic tectono-sedimentary evolution of the area. Emphasis is placed on the collision of terranes and/or continents and the ensuing fault reactivation; the impact of changes in climate on the sedimentation is also examined.

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Exhumation history of the western Kyrgyz Tien Shan: Implications for intramontane basin formation

et al. 2017

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The dextral Talas‐Fergana Fault separates the western from the central Tien Shan. Recent work has shed light on the Cenozoic evolution of the eastern and central Tien Shan; much less attention has been paid to the western Tien Shan. In this contribution we present new thermochronological ages for the Fergana and Alai ranges that, combined with the available data set, constrain the Cenozoic exhumation history of the western Tien Shan. Following a tectonically quiet early Cenozoic period, we suggest an onset of exhumation at ~25 Ma. This early onset was followed by a period of slower exhumation and in some areas minor reheating. A final, strong late Miocene rapid cooling event is well represented in the western Tien Shan as in other sectors of the range. The early onset of uplift of the western Tien Shan dissected the previously continuous westernmost Parathethyan Sea, progressively isolating basins (e.g., Fergana, Tarim, and Alai basins) in the central Asian hinterland. Moreover, the coeval timing of late Miocene uplift along the length of entire Tien Shan implies that neither the Pamir nor Tarim can be the sole driver for exhumation of the entire range.

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Proterozoic–Mesozoic history of the Central Asian orogenic belt in the Tajik and southwestern Kyrgyz Tian Shan: U-Pb,⁴⁰Ar/³⁹Ar, and fission-track geochronology and geochemistry of granitoids

Cited by 44 publications

References 112 publications

Thermochronological insights into the structural contact between the Tian Shan and Pamirs, Tajikistan

Thermochronological insights into the structural contact between the Tian Shan and Pamirs, Tajikistan

Geological evolution of Central Asian Basins and the western Tien Shan Range

Exhumation history of the western Kyrgyz Tien Shan: Implications for intramontane basin formation

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Proterozoic–Mesozoic history of the Central Asian orogenic belt in the Tajik and southwestern Kyrgyz Tian Shan: U-Pb,40Ar/39Ar, and fission-track geochronology and geochemistry of granitoids

Cited by 44 publications

References 112 publications

Thermochronological insights into the structural contact between the Tian Shan and Pamirs, Tajikistan

Thermochronological insights into the structural contact between the Tian Shan and Pamirs, Tajikistan

Geological evolution of Central Asian Basins and the western Tien Shan Range

Exhumation history of the western Kyrgyz Tien Shan: Implications for intramontane basin formation

Contact Info

Product

Resources

About

Proterozoic–Mesozoic history of the Central Asian orogenic belt in the Tajik and southwestern Kyrgyz Tian Shan: U-Pb,⁴⁰Ar/³⁹Ar, and fission-track geochronology and geochemistry of granitoids