Apatite fission track evidence for uplifting-exhumation processes of mountains surrounding the Junggar basin.
Apatite fission track evidence for uplifting-exhumation processes of mountains surrounding the Junggar basin.
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作者：
L. Li
对准噶尔盆地周边山区采集的12个花岗岩样品进行了磷灰石裂变径迹测年和热历史模拟，以研究山脉的抬升-折返过程。分析结果表明，天山、东、西准噶尔山脉的抬升-折返过程模式存在显著差异。结合样品的位置，认为准噶尔盆地周围山区自晚三叠世以来可能至少经历了三期降温事件。但始发于晚三叠世至早侏罗世的事件仅限于东准噶尔山脉，中晚白垩世(~115~95 Ma)的降温事件。在古新世早期(~60~50 Ma)，准噶尔北部以隆升和折返为主，新近世(~25 Ma以来)降温事件仅由来自准噶尔盆地东南部(博格达山)的样品记录，可能是由于印度-欧亚碰撞的远场效应所致，表明东、西准噶尔山脉在此期间一直保持相对稳定。
Apatite Fission track dating and thermal history modeling have been carried out from 12 granite samples collected from mountains surrounding the Junggar Basin to investigate the uplifting-exhumation processes of mountains.Analyses results reveal significant discrepancy in patterns of uplifting-exhumation processes among the Tianshan,East and West Junggar mountains.Combined with samples locations,it was suggested that there probably have been at least three phases of cooling events throughout surrounding mountains of Junggar Basin since Late Triassic.The event initiated during the Late Triassic to early Jurassic was simply limited to the East Junggar mountain,and the Middle-late Cretaceous(～115～95Ma)cooling event,however,had been demonstrated by roughly all samples all over the surrounding mountains.During the early Paleocene(～60～50Ma)northern Junggar mountains had been predominantly uplifted and exhumed.The Neoeene(since～25Ma)cooling event was only recorded by samples collected from southeastern Junggar basin(Bogeda mountains),probably due to the far-field effect of the Indo-Eurasian collision,suggesting that the east and west Junggar mountains have been staying relative stable during this time period.