摘要
运用冷却年龄理论研究乱泥滩花岗岩体的冷却史,从124.1Ma岩体定位至80Ma暴露地表,平均冷却速率为17.6℃/Ma.平均隆起上升速度为0.11mm/y,其间经历了四个冷却和隆起上升阶段。与古地磁学结合确定岩体的移动轨迹:在122Mn-105Ma期间岩体移动方向指向NNw;105Ma—80Ma期间转向NEE方向。其平均推移速度为4.0cm/y.在不同时期移动方向和速度不同,反映各时期本区构造发展的趋势和强度。这一结果得到本区区域地质构造相同期沉积地层古地磁资料的证实。
The cooling history of Luannitan granite has been studied with the theory of cooling ages. The granite intrusive age is 124. lMa,the exposure age is 80 Ma,its average cooling rate is 17. 6℃/Ma ,and its average uplift speed is 0. 11mm/y, which underwent four stages of cooling and rising between 124. 1Ma and 80Ma. The horizonal movement path of the granite has been datermined by means of both cooling history and paleomagetics: the movement direction of the granite is the NNW during 122Ma-105Ma,but it turns to the NEE during 1 05Ma- 80Ma,and the average movement speed of the granite in 4. 0 cm/y during 122Ma-80Ma. The movement direction and speed in different periods reflect the tectonic development trend and intensity of this region. The regional tectonic analyses and paleomagnetic data have confirmed the aforesaid conclusion.
出处
《火山地质与矿产》
1993年第2期1-11,共11页
Volcanology & Mineral Resources
关键词
花岗岩
冷却史
移动轨迹
湖北
granite,closure tempreture,cooling history,movement path,Hubei province
