The thermal history and uplift process of the Ouxidaban pluton in the South Tianshan orogen: Evidence from Ar-Ar and (U-Th)/He
The thermal history and uplift process of the Ouxidaban pluton in the South Tianshan orogen: Evidence from Ar-Ar and (U-Th)/He
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南天山欧西达坂岩体热史及隆升过程：来自Ar-Ar和(U-Th)/He的证据
DOI：
10.1007/s11430-015-5218-z
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发表时间：
2016-02
期刊：
影响因子：
--
通讯作者：
YUAN Xia
中科院分区：
文献类型：
--
作者：
ZHANG Bin;CHEN Wen;SUN JingBo;YU Shun;YIN JiYuan;LI Jie;ZHANG Yan;LIU XinYu;YANG Li;YUAN Xia
天山造山带晚古生代以来的隆升折返过程可能与矿床的保存有关。利用角闪岩/斜长石Ar-Ar和锆石/磷灰石（U-Th）/He方法恢复了南天山中部欧西达坂岩体的整个构造热历史。根据前人的研究成果，结合冷却/折返速率特征，分析了南天山中段晚古生代以来的热历史和隆升过程。角闪岩的坪年龄为382.6± 3.6Ma，斜长石的加权平均年龄为265.8± 4.9Ma。欧西达坂岩体的锆石U-Th/He加权平均年龄为185.8± 4.3Ma，磷灰石U-Th/He加权平均年龄为31.1± 2.9Ma。根据冷却曲线和模型模拟，南天山晚古生代以来的构造热历史可划分为5个阶段：（1）志留纪末至晚泥盆世，欧西达坂岩体的平均冷却速率为7.84°C/Ma，（2）晚泥盆世末至中二叠世末，平均冷却速率为2.07°C/Ma;（3）中二叠世末至始新世中期，冷却速率下降至0.68°C/Ma左右，表明此时构造活动较为平缓;（4）冷却速率突然增加（5.00°C/Ma）和折返速率（0.17 mm/a），地壳折返约1.83 km，表明欧西达坂岩体在始新世遭受了一次快速隆升事件（5）中始新世以来持续快速隆升，平均冷却速率为1.14°C/Ma，折返速率约为0.04 mm/a，折返厚度约为1.33 km。新生代以来的强烈隆升与印度板块和欧亚板块碰撞的远场效应有关。但在天山造山带，这种远程效应具有滞后性。
The uplift and exhumation process in the Tianshan orogen since the late Paleozoic were likely related to the preservation of ore deposits. This study involved reconstructing the whole tectonic thermal history of the Ouxidaban pluton in central South Tianshan Mountains based on hornblende/plagioclase Ar-Ar and zircon/apatite (U-Th)/He methods. The thermal history and uplift process of central South Tianshan Mountains since the late Paleozoic were analyzed according to the results of previous works and cooling/exhumation rate features. The hornblende yields a plateau age of 382.6±3.6 Ma, and the plagioclase yields a weighted mean age of 265.8±4.9 Ma. The Ouxidaban pluton yields weighted mean zircon (U-Th)/He age of 185.8±4.3 Ma and apatite (U-Th)/He age of 31.1±2.9 Ma, respectively. Five stages of tectonic thermal history of South Tianshan Mountains since the late Paleozoic could be discriminated by the cooling curve and modeling simulation: (1) from the latest Silurian to Late Devonian, the average cooling rate of the Ouxidaban pluton was 7.84°C/Ma; (2) from the Late Devonian to the latest Middle Permian, the average cooling rate was about 2.07°C/Ma; (3) from the latest Middle Permian to the middle Eocene, the cooling rate decreased to about 0.68°C/Ma, suggesting that the tectonic activity was gentle at this time; (4) a sudden increase of the cooling rate (5.00°C/Ma) and the exhumation rate (0.17 mm/a), and crustal exhumation of ~1.83 km indicated that the Ouxidaban pluton would suffer a rapid uplift event during the Eocene (~46-35 Ma); (5) since the middle Eocene, the rapid uplift was sustained, and the average cooling rate since then has been 1.14°C/Ma with an exhumation rate of about 0.04 mm/a and an exhumation thickness of 1.33 km. The strong uplift since the Cenozoic would be related to a far-field effect from the Indian and Eurasian plates’ collision. However, it was hysteretic that the remote effect was observed in the Tianshan orogenic belt.
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DOI：
--
发表时间：
2006
期刊：
Geological Review
影响因子：
--
作者：
Zhang Yan
通讯作者：
Zhang Yan
影响因子：
4.9
作者：
K. Kodama;P. Ward
通讯作者：
K. Kodama;P. Ward
影响因子：
1.8
作者：
Z. Dong;A. Yu
通讯作者：
Z. Dong;A. Yu
影响因子：
2.6
作者：
N. Dobretsov;M. Buslov;D. Delvaux;N. A. Berzin;V. D. Ermikov
通讯作者：
N. Dobretsov;M. Buslov;D. Delvaux;N. A. Berzin;V. D. Ermikov
影响因子：
1.8
作者：
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通讯作者：
C. Wen;Zhan Yan