Cenozoic exhumation history of Sulu terrane: Implications from (U–Th)/He thermochrology
Cenozoic exhumation history of Sulu terrane: Implications from (U–Th)/He thermochrology
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苏鲁地体新生代剥露历史：(U-Th)/He热年代学的启示
DOI：
10.1016/j.tecto.2016.01.035
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发表时间：
2016-03
期刊：
影响因子：
2.9
通讯作者：
Qingchen Wang
中科院分区：
文献类型：
--
作者：
Lin Wu;Patrick Monié;Fei Wang;Wei Lin;Wenbin Ji;Michael Bonno;Philippe Münch;Qingchen Wang
秦岭-大别-苏鲁造山带是中国最重要的中生代造山带。锆石包裹体中超高压矿物的发现表明，地壳俯冲到地幔中120 km以上，然后折返到地壳浅部。近年来，低温热年代学被用于研究大别山的最终折返过程，而对苏鲁带新生代折返过程的研究却很少。本文报道了苏鲁造山带及其北方-胶北造山带不同岩性的（U-Th）/He年龄。单颗粒He年龄在18 ~ 154 Ma之间，大多数样品具有较大的样品内年龄离散性。这可能是由于不可见的富U/Th包裹体、晶粒尺寸效应、冷却速度慢、母核分带或辐射损伤效应等原因造成的。所有样品的单颗粒年龄数据在~ 45 Ma时都有一个峰值，这与合肥盆地的钻孔裂变径迹年龄模式一致。苏鲁地区的（U-Th）/He年龄和裂变径迹年龄表明，郯庐断裂带南部早-中始新世经历了一次强烈的剥露/冷却作用。这一增强的冷却事件与华北盆地的快速沉降及其周边地形的快速抬升相吻合，表明盆山耦合。这一始新世事件在中国中部广泛存在，可能是印度-亚洲碰撞的远场后果。早第三纪太平洋板块与欧亚大陆的会聚速率大幅下降，始新世达到最小值（~ 30-40 mm/yr），与此同时印度板块与亚洲板块的碰撞完成。因此，苏鲁造山带新生代的折返历史是印度-亚洲碰撞的远场效应和太平洋板块俯冲速率下降共同作用的结果。
The Qinling-Dabie-Sulu orogen is the most prominent Phanerozoic orogenic belt in China. The discovery of ultra-high pressure (UHP) minerals in zircon inclusions suggests that the crust was subducted to deeper than 120 km into the mantle and then exhumed to shallow crustal. Recently, low temperature thermochronology has been applied to constrain the final exhumation of Dabie Shan, while there are few studies describing the Cenozoic exhumation history of the Sulu belt. Here we report some (U-Th)/He ages for various lithologies from Sulu Orogenic belt and its northern part- Jiaobei terrane. The single grain He ages range between 18 and 154 Ma, and most of the samples having large intra-sample age scattering. Several reasons such as invisible U/Th-rich inclusions, grain size effect, slow cooling rate, and zonation of parent nuclide or radiation damage effect may account for this dispersion. For all samples, the pattern of the single grain age data exhibits a peak at ~ 45 Ma which is consistent with the borehole fission-track age pattern in adjacent Hefei Basin. Both (U-Th)/He and fission track ages of the Sulu area suggest an enhanced exhumation/cooling in Early-Middle Eocene in the southern part of Tan-Lu fault zone. This enhanced cooling event coincides with rapid subsidence of North China Basin and rapid uplift of its surrounding reliefs, which indicates basin-mountain coupling. This Eocene event is widespread in central China and could be far-field consequence of India-Asia collision. The convergence rate between Pacific Plate and Eurasia decreased substantially during early Tertiary and reached a minimum in Eocene (~ 30–40 mm/yr) while at the same time the collision between India and Asia was completed. Therefore, the Cenozoic exhumation history of the Sulu Orogenic Belt was a combined result of far-field effect of India-Asia collision and declined subduction rate of the Pacific Plate under Eurasia.
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DOI：
10.1007/bf02875393
发表时间：
2001-11
期刊：
Science in China Series D: Earth Sciences
影响因子：
--
作者：
Guang Zhu;Chuanzhong Song;Daoxuan Wang;Guosheng Liu;Jiawei Xu
通讯作者：
Guang Zhu;Chuanzhong Song;Daoxuan Wang;Guosheng Liu;Jiawei Xu
DOI：
10.1007/bf03180353
发表时间：
1983
期刊：
--
影响因子：
--
作者：
Liu Ruoxin;Sun Jianzhong;Chen Wenji
通讯作者：
Liu Ruoxin;Sun Jianzhong;Chen Wenji
影响因子：
3.9
作者：
Jin-Hui Yang;Fu-Yuan Wu;Sun‐Lin Chung;S. Wilde;M. Chu;C. Lo;B. Song
通讯作者：
Jin-Hui Yang;Fu-Yuan Wu;Sun‐Lin Chung;S. Wilde;M. Chu;C. Lo;B. Song
影响因子：
3.9
作者：
Jin-Hui Yang;Sun‐Lin Chung;S. Wilde;Fu-Yuan Wu;M. Chu;C. Lo;H. Fan
通讯作者：
Jin-Hui Yang;Sun‐Lin Chung;S. Wilde;Fu-Yuan Wu;M. Chu;C. Lo;H. Fan
影响因子：
3.9
作者：
V. Chavagnac;B. Jahn
通讯作者：
V. Chavagnac;B. Jahn