【摘要】 应用热年代学方法,测定了湘东北望湘岩体的热历史,分析了九岭—幕阜山岭的隆升过程。望湘岩体约于140.0Ma侵位,其4个不同高程的样品的锆石裂变径迹年龄范围为85.5～74.3Ma,磷灰石裂变径迹年龄范围为55.6～45.2Ma。结果表明,九岭—幕阜山岭自中新生代以来,经历了3期(132.0～120.0,81.1～55.6,47.0～30.0Ma)较强烈的隆升和剥蚀夷平过程。更多还原

【Abstract】 Northeastern Hunan area is a polycycle composite orogenic belt and exhibits basin-range structures.Thermochronological dating is used to study the thermal history of Wangxiang intrusive complex and analyze the uplift process of Jiuling-Mufushan range.Wangxiang granites intruded in approximately 140 Ma.Four fission track zircon ages of Wangxiang granites from different elevations are in the range of 74.3-85.5 Ma;four fission track apatite ages of Wangxiang granites from different elevations are in the range of 45.2-55.6 Ma.The results show Jiuling-Mufushan range has experienced stronger uplift and denude-planned process in three stages(132.0-120.0,81.1-55.6,47.0-30.0 Ma)since Mesozoic and Cenozoic era.更多还原