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引用本文:柏道远1,2 孟德保2 刘耀荣1 马铁球2. 青藏高原北缘昆仑山中段构造隆升的磷灰石裂变径迹记录[J]. 中国地质, 2003, 30(3): 240-246.
BAI Dao-yuan1,2, MENG De-bao2, LIU Yao-rong1, MA Tie-qiu2. Apatite fission-track records of the tectonic uplift of the central segment fo the Kunlun Mountains on the northern margin of the Qinghai-Tibet Plateau[J]. Geology in China, 2003, 30(3): 240-246(in Chinese with English abstract).
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青藏高原北缘昆仑山中段构造隆升的磷灰石裂变径迹记录
柏道远1,2 孟德保2 刘耀荣1 马铁球21,2
1.中国地质大学资源学院,湖北 武汉 430074;2.湖南省地质调查院 ,湖南 湘潭 411100
摘要:
提要:3组磷灰石裂变径迹年龄分别反映出阿尔金地块白垩纪末(69.5±2.9)Ma、昆仑山前山地带和昆仑山后山地带(高原区北缘)上新世晚期(4.2± 0.8)Ma和(3.9±0.6)Ma、早更新世中期(1.66±0.31)Ma等3次构造抬升事件。根据磷灰石裂变径迹分析样品的古埋深及据前人有关资料推测的古地表高程,换算出样品的古海拔高程,再由高程差得出绝对构造抬升量,绝对抬升速率为绝对抬升量与时间(裂变径迹年龄)差之比。计算结果:阿尔金山北缘69Ma以来总共抬升了4 940 m,平均抬升速率为0.072 mm/a。昆仑山前山地带4.15 Ma至1.66 Ma间总共抬升了1 380 m,平均抬升速率为0.55 mm/a;1.66 Ma以来总共抬升了4 140 m,平均抬升速率为2.49 mm/a。昆仑山后山地带3.85 Ma至1.66 Ma间总共抬升量约为1 500 m,平均抬升速率为0.70 mm/a;1.66 Ma以来总共抬升量约为5 140 m,平均抬升速率为3.19 mm/a。结合有关阶地特征及年龄,推算出21 ka左右的晚更新世末以来昆仑山后山的抬升速率可能达11 mm/a。昆仑山后山地带较前山地带4 Ma以来相对抬升了1 120 m,二者的平均隆升速率比约为1.2。
关键词:  青藏高原北缘  构造隆升  磷灰石  裂变径迹
DOI:
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基金项目:国土资源部地质大调查项目(19991300009051)资助。
Apatite fission-track records of the tectonic uplift of the central segment fo the Kunlun Mountains on the northern margin of the Qinghai-Tibet Plateau
BAI Dao-yuan1,2, MENG De-bao2, LIU Yao-rong1, MA Tie-qiu21,2
1.Faculty of Resources, China University of Geosciences, Wuhan 430074, Hubei, China;2.Hunan Institute of Geology Survey, Xiangtan 411100, Hunan, China
Abstract:
Abstract: Three groups of apatite fission-track ages indicate three tectonic uplift events: the uplift of the Altyn Tagh block at the end of the Cretaceous (69.5±2.9 Ma BP) and the uplifts of the front of the Kunlun Mountains and rear zone of the Kunlun Mountains (on the northern margin of the plateau region) in the late Pliocene (4.2±0.8 Ma BP and 3.9±0.6 Ma BP) and in the middle Early Pleistocene (1.66±0.31 Ma BP). The paleo-altitudes of the apatite fission-track samples are calculated on the basis of the paleo-burial depths of the samples and paleo-altitudes of the surface inferred according previous relevant data, and then the absolute tectonic uplift amount is calculated, which is equivalent to the altitude difference and the absolute rate of tectonic uplift is equivalent to the ratio of the absolute uplift amount to the difference of apatite fission-track ages. The results of the calculation are as follows:the northern margin of the Altyn Tagh has risen 4 940 m since 69 Ma BP, with an average uplift rate of 0.072 mm/a; the front zone of the Kunlun Mountains has risen 1 380 m from 4.15 to 1.66 Ma BP, with an average uplift rate of 0.55mm/a, and risen 4 140 m since 1.66 Ma BP, with an average uplift rate of 2.49 mm/a; the rear zone of the Kunlun Mountains has risen 1 500 m from 3.85 to 1.66 Ma BP, with an average uplift rate of 0.70 mm/a, and it has risen 5 140 m since 1.66 Ma BP, with an average uplift rate of 3.19 mm/a. In combination with the relevant terrace features and ages, it may be estimated that the average uplift rate of the rear zone of the Kunlun Mountains may have reached 11 mm/a since the end of the late Pleistocene (21 ka BP). The rear zone of the Kunlun Mountains may have risen 1 120 m relative to the front zone of the Kunlun Mountains since 4 Ma BP and the ratio of the average uplift rates of the two zones is about 1.2.
Key words:  northern margin of the Qinghai-Tibet plateau  tectonic uplift  apatite  fission-track