Uplift-Exhumation History of Daqing Mountain, Inner Mongolia Since Late Mesozoic

doi:10.13209/j.0479-8023.2016.096

Abstract

Abstract:

Four bedrock samples, collected from the eastern segment of Daqing Mountain, were analyzed using apatite fission-track (AFT) method. This elucidates the uplift-exhumation history of this area since the Late Cretaceous — in particular, when the present geomorphology of Daqing Mountain was shaped. The AFT ages range from 57.7±3.8 Ma to 50.4±3.3 Ma and the track length is between 10.7±0.4 μm and 9.9±0.1 μm. Modeling of the fission track data suggests two stages of rapid uplift and cooling, 100-90 Ma and since 13.5-7 Ma. The second cooling stage (since 13.5-7 Ma) was characterized by the fast uplift-exhumation in this area, resulting in the present geomorphology of Daqing Mountain.

Key words: apatite fission track, uplift-exhumation, Middle-Late Miocene, Daqing Mountain

摘要：

对大青山东段 4 件基岩样品进行磷灰石裂变径迹研究, 获得该区晚中生代以来的隆升-剥露历史, 并探讨大青山现代地貌的形成。样品的磷灰石裂变径迹年龄为 57.7±3.8~50.4±3.3 Ma, 封闭径迹长度分布在10.7±0.4~9.9±0.1 μm之间。热历史模拟结果表明, 大青山地区存在晚白垩世(约 100~90 Ma)和中-晚中新世(13.5~7 Ma)以来两个快速抬升冷却阶段, 13.5~7 Ma 以来是本区剥露最快的时期, 这一阶段的隆升造就现今大青山的地貌格局。

关键词: 磷灰石裂变径迹, 隆升-剥露, 中-晚中新世, 大青山

CLC Number:

P542

Qinqin XU, Jianqing JI, Wentao ZHAO, Xiangjiang YU. Uplift-Exhumation History of Daqing Mountain, Inner Mongolia Since Late Mesozoic[J]. Acta Scientiarum Naturalium Universitatis Pekinensis, 2017, 53(1): 57-65.

徐芹芹, 季建清, 赵文韬, 于祥江. 内蒙古大青山晚中生代以来的隆升‒剥露过程[J]. 北京大学学报自然科学版, 2017, 53(1): 57-65.

Figures/Tables 5

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样品号		岩性		采样位置			高程/m	N_c	N_s	ρ_s/10⁵cm²			N_i		ρ_i/10⁵cm²
DQS-1		片麻岩		40°56′30″N, 111°31′23″E			1511	32	710	4.685			2356		15.545
DQS-2		花岗岩		41°05′07″N, 111°48′02″E			1796	32	451	3.838			1398		11.898
DQS-3		片岩		41°02′46″N, 111°48′19″E			1638	30	438	5.267			1522		18.302
DQS-4		片岩		41°02′46″N, 111°48′19″E			1638	12	191	3.727			574		11.200
样品号	N_d		ρ_d/10⁵cm²		Pχ²/%	中值年龄/Ma (±1σ)		池年龄/Ma (±1σ)			L/μm (±1σ)	N_j		标准偏差/μm
DQS-1	8875		9.7534		88.60	55.0±3.1		55.0±3.1			10.7±0.4	106		2.1
DQS-2	4798		9.5498		99.84	57.7±3.8		57.7±3.8			9.9±0.3	82		1.1
DQS-3	8875		9.3462		98.86	50.4±3.3		50.4±3.3			10.3±0.1	59		1.3
DQS-4	8875		8.9389		59.50	56.7±5.6		55.7±5.1			-

样品号		岩性		采样位置			高程/m	N_c	N_s	ρ_s/10⁵cm²			N_i		ρ_i/10⁵cm²
DQS-1		片麻岩		40°56′30″N, 111°31′23″E			1511	32	710	4.685			2356		15.545
DQS-2		花岗岩		41°05′07″N, 111°48′02″E			1796	32	451	3.838			1398		11.898
DQS-3		片岩		41°02′46″N, 111°48′19″E			1638	30	438	5.267			1522		18.302
DQS-4		片岩		41°02′46″N, 111°48′19″E			1638	12	191	3.727			574		11.200
样品号	N_d		ρ_d/10⁵cm²		Pχ²/%	中值年龄/Ma (±1σ)		池年龄/Ma (±1σ)			L/μm (±1σ)	N_j		标准偏差/μm
DQS-1	8875		9.7534		88.60	55.0±3.1		55.0±3.1			10.7±0.4	106		2.1
DQS-2	4798		9.5498		99.84	57.7±3.8		57.7±3.8			9.9±0.3	82		1.1
DQS-3	8875		9.3462		98.86	50.4±3.3		50.4±3.3			10.3±0.1	59		1.3
DQS-4	8875		8.9389		59.50	56.7±5.6		55.7±5.1			-