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| 1 | 基于核密度估计的碎屑颗粒年龄分析及应用:松辽盆地构造事件定年显示文摘碎屑矿物热年代学是了解板块碰撞、造山带抬升剥露以及盆地沉积等地质事件的重要途径之一。同一沉积区内碎屑颗粒通常是多来源的,含有不同的年龄组分,如何获得真实的年龄组分分布样式,进而准确地提取出地质年龄信息是碎屑颗粒年龄分析的关键。由于受到数学原理、组距选择和样品分析测试误差等因素的影响,常用的地质年龄频率分布图和概率密度曲线难以得到真实的年龄分布样式。本文引入一种新的同位素年龄数据统计方法——核密度估计法。该方法以同位素年龄数据为基础,根据数据密度和测试误差自适应变换带宽函数,减少了测试误差和样本数量的干扰,有效地提高了年龄分解精度。该方法尤其适用于同位素年龄样本数量少的研究新区以及测试误差大的碎屑颗粒年代学数据分析。本文应用核密度估计法,对大兴安岭地区显生宙花岗岩锆石U-Pb年龄数据库和松辽盆地碎屑磷灰石裂变径迹年龄数据进行了分析,所得到的年龄分布样式不但与区域地质背景、盆地构造-沉积记录等地质事实相吻合,还进一步准确约束了区域构造事件的年代界限。因此核密度估计法是一种能合理有效地进行地质年龄分布样式分析的先进统计方法。 | 宋鹰 张俊霞 Andrei Stepashko 袁万明 丛旭日 | 2016 | 地学前缘2016，23，4： | 4 |
| 2 | Occurrence of Excess ^40Ar in Amphibole: Implications of ^40Ar/^39Ar Dating by Laser Stepwise Heating and in vacuo Crushing显示文摘The joint methods of ^(40)/^(39)Ar laser stepwise heating and in vacuo crushing have been applied to date amphiboles from the North Qaidam ultra-high pressure metamorphic amphibolites. Two amphibole samples analyzed by laser heating yielded saddle-shaped age spectra with total gas ages of 574.5±2.5 and 562.5±2.5 Ma. These ages are much older than the reported zircon U-Pb ages(~495 Ma) from Yuka eclogite, indicating the presence of excess 40 Ar. In order to decipher the occurrence of excess ^(40) and constrain the age of amphibolite-facies retrogression, two duplicate amphibole samples were further employed for ^(40)Ar/^(39)Ar in vacuo crushing analyses. Both samples exhibit similar monotonically declining release spectra, which are characterized by rapid decline of anomalously old apparent ages in the early steps. The data of the late steps yielded concordant apparent ages with plateau ages of 460.9±1.2 and 459.6±1.8 Ma. We interpret that gases released in the early steps derive from the significant excess ^(40)Ar containing secondary fluid inclusions(SFIs) due to their distribution characteristics along cracks leading to be easily extracted, whereas those released in the later steps represent the contribution of the small primary fluid inclusions(PFIs). | Rong-Guo Hu Xiu-Juan Bai Jan Wijbrans Fraukje Brouwer Yi-Lai Zhao Hua-Ning Qiu | 2018 | Journal of Earth Science2018，29，2： | 3 |
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