磷灰石裂变径迹与结晶C轴的夹角对模拟热历史的影响

现代地质 ›› 2013, Vol. 27 ›› Issue (5): 1131-1136.

磷灰石裂变径迹与结晶C轴的夹角对模拟热历史的影响

焦亚先^1,2，邱楠生^2,3，阙永泉^2,3

中国石油(北京)华北油田公司勘探开发研究院，河北任丘 062552

收稿日期:2013-05-07 修回日期:2013-07-28 出版日期:2013-10-17 发布日期:2013-10-31
通讯作者: 邱楠生，男，教授，博士生导师，1968年出生，构造地质学专业，主要从事沉积盆地构造一热演化和油气成藏机理方面的教学和科研工作
作者简介:焦亚先，女，硕士，1989年出生，构造地质学专业，主要从事沉积盆地构造一热演化以及油气成藏机理方面的研究。Email：jiaoyaxian163@163.com
基金资助:
国家自然科学基金项目(91114202, 41125010, 41072103)

Effects of Fission-track Angle to Crystallographic C Axis in Apatite on Thermal History

JIAO Ya-xian^1,2，QIU Nan-sheng^2,3，QUE Yong-quanz^2,3

Exploration and Development Research Institute,PetroChina Huabei Oilfield Company, Renqiu, Hebei 062552，China

Received:2013-05-07 Revised:2013-07-28 Online:2013-10-17 Published:2013-10-31

摘要/Abstract

摘要：

磷灰石裂变径迹退火行为是磷灰石裂变径迹技术模拟热历史的基础，退火程度的不同会导致径迹的长度不同，其中退火的各向异性(与结晶C轴夹角不同退火行为不同)是导致长度差异的重要因素。首先利用C轴投影模型将任意夹角的径迹转化成与l;轴平行的径迹，以此消除分布方位的影响，进而探讨实际测量长度相同而分布方位不同的径迹模拟的热历史之间的差异。研究结果表明，磷灰石裂变径迹与结晶C轴夹角不同揭示的最高古地温之间最大差异为15℃，用来研究剥蚀量和年轻造山带冷却抬升速率引起的最大差异可分别达到430 m及1. 5 ℃ /Ma，揭示构造抬升事件的初始抬升时间最大可相差2 Ma。因此，在实际模拟热历史时应注意该参数的影响，准确测量磷灰石裂变径迹与结晶C轴的夹角将有助于提高模拟热历史的精度。

关键词: 磷灰石裂变径迹, 结晶方位, 热史模拟

Abstract:

Thermal histories modeled from apatite fission-track( FT) data are dependent upon the annealing behavior of apatite fission-tracks. It has been confirmed that the rate of fission-track annealing correlates with apatite structure and the annealing rate is faster for fission-tracks with higher angle to crystallographic C axis，so different rates of fission-track annealing will eventually lead to different length distributions. In this study, the apatite fission-track length C axis projection model was used to eliminate the effects of different angles to crystallographic C axis，and then the difference of thermal histories modeled from apatite fission-tracks with the same length and different angle to crystallographic C axis was discussed. This paper has showed that the largest difference of the maximum palaeo-geotemperatures among the modeling history amount，cooling uplift rate and initial uplift time is 430 m is 15℃，and the largest difference in the erosion and 1. 5 ℃/Ma，respectively. And the result reveals that the largest difference of initial uplift time in each tectonic movement can reach up to 2 Ma. In the actual thermal history simulation，we should pay more attention to the influence of this parameter. Ideally，the angles of each apatite fission-track to crystallographic C axis should be measured to improve the thermal history precision.

Key words: apatite fission-track, crystallographic orientation, thermal history simulation

中图分类号:

焦亚先，邱楠生，阙永泉. 磷灰石裂变径迹与结晶C轴的夹角对模拟热历史的影响[J]. 现代地质, 2013, 27(5): 1131-1136.

JIAO Ya-xian，QIU Nan-sheng，QUE Yong-quanz. Effects of Fission-track Angle to Crystallographic C Axis in Apatite on Thermal History[J]. Geoscience, 2013, 27(5): 1131-1136.

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