Fission track thermochronology evidence for Mesozoic-Cenozoic uplifting of Daba Mountain,central China.
Fission track thermochronology evidence for Mesozoic-Cenozoic uplifting of Daba Mountain,central China.
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发表时间：
2007
影响因子：
1.8
通讯作者：
Shen Chuan;Tang Ji
中科院分区：
文献类型：
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作者：
Shen Chuan;Tang Ji
研究大巴山中、新生代隆升过程，对全面认识秦岭构造演化具有重要意义，对川东北地区油气勘探具有指导意义。对大巴山地区18个样品进行了磷灰石裂变径迹测年和时-温热史模拟分析，结果表明，大巴山中、新生代隆升过程主要发生在中、新生代，而晚新生代隆升过程主要发生在晚新生代。大巴山自白垩纪以来的新生代隆升过程可分为三个阶段，表现为不断的隆升和冷却，隆升时代由东北向西南逐渐呈现出年轻化，这表明大巴山挤压逆冲和褶皱隆升的增强规律，早期120~ 200 km的快速隆升冷却事件，110 Ma是秦岭白垩纪区域隆升折返事件的具体体现，在经历了一段相对热稳定期后，岩石保持在磷灰石部分退火带温度，并在10~6 Ma结束了新的加速隆升阶段，这一加速隆升事件是对青藏高原隆升向东扩展和侧向生长的响应，并持续至今。
Studying on the Mesozoic-Cenozoic uplifting of Daba Mountain is an important significance to understand the tectonic evolution of Qinling orogeny roundly.And it is instructional value for petroleum exploration of Northeast Sichuan Basin.Apatite fission track dating and time-temperature thermal history modeling were carried to analyze on 18 samples in the Daba Mountain.The results indicate that the Mesozoic-Cenozoic uplifting process of Daba Mountain since the Cretaceous can be divided into three stages and show continuous uplifting and cooling.The uplifting age bear juvenility gradually from northeast to southwest,which indicated the increase disciplinary of extrusion thrusting and folding uplifting in Daba Mountain.The early rapid uplifting cooling event at 120～110 Ma is the embodiment of the Cretaceous territorial uplifting and exhumation event of Qinling orogeny.Following by a period of relative thermal stability,the rocks kept at apatite partial annealing zone temperatures,and ending with a new phase of accelerated uplifting during 10～6 Ma to resent.This accelerated uplifting event is response to eastward growth of the Tibetan Plateau uplift and lateral growth, which continues today.