通过碎屑低温年龄恢复西南天山古高度

doi:10.13278/j.cnki.jjuese.201703112

Abstract

Abstract: At present, paleoelevation reconstructiion of the orogenic belt is mainly based on low-temperature thermochronology of samples collected within the orogenic belt. In this paper, a method is proposed to recover the average height change rate of the orogenic belt by using the low-temperature chronology of the detrital grains, which provides a new way for the restoration of orogenic paleo-terrain. It means that the large-scale and regional average exhumation rate can be calculated through the detrital single grain ages located in intramontane basin or piedmont, and then the average ancient height change rate of the erosion area can be calculated by the isostatic correction. In this paper, the calculation results are, by using the published 339 detrital grain ages of fission track, that the exhumation rate of 6-8 Ma (age peak) of southwestern Tianshan was 0.74-0.60 km/Ma, and the average ancient height change rate was 0.15 to 0.23 km/Ma and 0.12 to 0.19 km/Ma (decreasing rate). This conclusion indicates that the southwestern Tianshan has experienced a rapid exhumation since 6-8 Ma ago, in the case of without considering the structural uplift and other factors, and the average paleo-height has decreased rapidly 1 000-1 500 m since 8 Ma ago.

Key words: detrital grains, fission track, exhumation rate, southwestern Tianshan

CLC Number:

Ding Ruxin, Liang Shiyou, He Jiangqi. Paleoelevation Reconstruction of Southwestern Tianshan Using Detrital Low-Temperature Thermochronology[J].Journal of Jilin University(Earth Science Edition), 2017, 47(3): 785-792.

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Paleoelevation Reconstruction of Southwestern Tianshan Using Detrital Low-Temperature Thermochronology

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