【作者】 陈泽超；

【导师】 宋传中；

【作者基本信息】 合肥工业大学 ， 构造地质学， 2010， 硕士

【摘要】 本文所研究的区域为大别造山带南缘浠水-马垅地区。该地区出露的岩片可分为铁冶岩片、麻桥岩片与飞虎山岩片。对三大岩片进行野外的观测、岩石显微构造、有限应变及温压分析。得出该地区的构造几何模型为管状。铁冶岩片处于管状模型的中心,能干性较强;麻桥岩片与飞虎山岩片组成管状模型的外壁。岩体中有长英质脉体充填。通过对大别造山带南缘构造带马垅地区所采岩石进行了岩石的有限应变测量测得应变椭圆的轴率Rs=1.5-2.0(所测矿物为长石),也指示该构造带岩石发生塑性变形。大别造山带南缘地质体中物质的运移方式为北西-南东方向,且为南东向北西运移。研究区西南缘发育断层殷店-马垅断层为右行走滑断层。经分析该地区的地质体变形受北西-南东向拉应力的影响,该方向的应力为印支期扬子板块向华北板块斜向挤压而产生的分量,并叠加太平洋板块向东亚板块碰撞在北西-南东方向水平分量而产生的合力。大别山南缘构造带上的片麻岩中的锆石用LA-ICP-MS法进行U-Pb测年。大别山南缘构造带马垅地区花岗片麻岩的原岩年龄为837±22Ma、MSWD=3.0,与前人在大别山南缘构造带所得年龄相一致,为多期构造活动后保留的元古宙扬子克拉通的原岩。所得年龄点集中分布下交点附近的不一致线上,所得年龄属于三叠纪印支期,其207Pb/206Pb的加权平均年龄分别为222±31Ma,MSWD=81,该年龄为扬子板块相对于秦岭-大别造山带的陆内俯冲的时间。飞虎山岩片年龄在谐和线下方,与谐和线的下交点年龄为151±79Ma,记录该地区燕山期构造活动的时间,是超高压变质岩折返的时代。更多还原

【Abstract】 This paper studied the regions in the southern edge of the Dabie orogenic belt Xishui– Malong area. The rocks exposed in this region can be divided into Tie Ye group, Ma Qiao group and Feihu Shan group. The observations of rock micro-structure, finite strain and temperature and pressure analysis are carried out on these three groups. This paper get the region’s tectonic geometry model tube. Tie Ye group in the center of tubular model, capable of strong; Ma Qiao group and Fei Hushan group are model composed of tubular outer wall. There are rock felsic veins filling. The experiment of rock finite strain has made on the Ma Qiao region, the shouthern edge of Dabie orogenic belt, measured the strain ellipse axial rate Rs=1.5-2.0, this result also indicates that the tectonic belt rocks plastic deformation occurs. Southwestern edge of the study area developed fault yindian - Ma Long fault is strike-slip fault. The analysis of the geology of the area deformation of the North West - South East, the impact of the tensile stress, the stress of the direction of the Yangtze plate to the North China plate oblique compression plate arising from the weight and superimposed the Pacific Plate to the East Asia plate collision in the North West - South East to the horizontal component of force generated. Zircon U-Pb dating used for gneiss of Tectonic belt in the southern edge of the Dabie Mountains. The southern edge of the Dabie Mountains belt Malong granitic gneiss area of the original rock age of 837±22Ma, MSWD = 3.0, with the former southern edge of the belt in the Dabie Mountains of age obtained is consistent for the multi-phase tectonic activity remaining after the Proterozoic period Yangtze craton of the original rock. The distribution of proceeds under the age spots near the intersection of the inconsistencies in line, derived from belonging to the Triassic age, Indo-China period, the weighted average of its 207Pb/206Pb age were 222±31Ma, MSWD = 81, the age of the Yangtze plate relative to the Qinling - Dabie orogenic belt intracontinental subduction of time. The age of Fei Hushan group harmonic line below the line under the intersection with the concordia age of 151±79Ma, record Yanshan period tectonic activity in the area, is the era of returned ultra-high pressure metamorphic rocks.更多还原