磷灰石低温热年代学技术及在塔里木盆地演化研究中的应用

发布时间：2018-03-15 09:08

本文选题：磷灰石低温热年代学　切入点：裂变径迹　出处：《地学前缘》2017年03期 　论文类型：期刊论文

【摘要】：随着磷灰石低温热年代学技术理论研究的不断完善和发展,它已被广泛用于地质体定年、构造-热演化、地形地貌演化等研究领域。该文首先对磷灰石裂变径迹和(U-Th)/He热定年技术近几年的研究进展进行了综述,在此基础上阐述了低温热年代学方法在塔里木盆地构造-热历史和物源分析领域的应用效果。多组分动力学退火模型的建立、激光剥蚀ICP-MS方法的提出及裂变径迹自动测试仪的开发极大地推动了磷灰石裂变径迹技术的发展。对于磷灰石(U-Th)/He热定年技术,FT-等效圆校正模型极大地降低了He年龄校正过程中产生的误差;辐射损伤捕获扩散模型首次揭示了晶格缺陷对4 He扩散的影响模式;辐射损伤积累和退火模型有效地解释了克拉通盆地部分磷灰石样品裂变径迹年龄小于He年龄的现象。塔里木盆地巴楚隆起的低温热年代学数据和热史模拟结果揭示出巴楚隆起自中生代以来曾经历过185~140Ma、140~100Ma、75~50 Ma等三期快速隆升事件,主要是由羌塘地体、拉萨地体、印度板块与欧亚板块南缘碰撞引起的。塔北隆起钻孔内浅部样品的磷灰石裂变径迹年龄和(U-Th)/He年龄都大于相应的地层年龄,记录的是物源区南天山的热信息;其热史模拟结果揭示出南天山曾经历过晚中新世—早上新世(15~5 Ma)一期快速隆升事件,并以此构建了塔里木盆地北部与南天山晚中新世—上新世构造-沉积耦合演化模式。
[Abstract]:With the continuous improvement and development of apatite low-temperature thermochronology theory research, it has been widely used in geological body dating, tectonic-thermal evolution. In this paper, the research progress of apatite fission track and thermal dating technique of U-Thn / he in recent years is reviewed. On this basis, the application effect of cryogenic thermochronology method in tectonic-thermal history and provenance analysis of Tarim Basin is described. The development of apatite fission track technology has been greatly promoted by the development of laser denudation ICP-MS method and the development of automatic fission track tester. For apatite U-ThU / he thermal dating technique, FTFT-equivalent circle correction model has greatly reduced his age. Errors in the correction process; The radiation damage capture diffusion model reveals the influence of lattice defects on 4He diffusion for the first time. The radiation damage accumulation and annealing model can effectively explain the phenomenon that the fission track age of some apatite samples in the craton basin is less than he age. Low temperature Thermochronology data and Thermal History Simulation results of Bachu uplift in Tarim Basin. It is shown that the Bachu uplift has experienced three rapid uplift events since the Mesozoic. It is mainly caused by the collision of Qiangtang terrane, Lhasa terrane, Indian plate and Eurasian plate. The apatite fission track age and the U-T / he age of shallow samples in the uplift of Tarim uplift are higher than the corresponding strata age. The thermal information of the South Tianshan Mountain in the provenance region is recorded, and the simulation results of its thermal history reveal that the South Tianshan Mountain has experienced a rapid uplift event of the late Miocene to the early Pleistocene during the first phase of 15 Ma. The coupling evolution model between the northern Tarim Basin and the South Tianshan late Miocene Pliocene tectonic-sedimentary system was constructed.
【作者单位】：中国石油大学(北京)油气资源与探测国家重点实验室;中国石油大学(北京)地球科学学院;
【基金】：国家自然科学基金项目(41402112,41125010,41072103) 中国石油大学(北京)科研启动基金项目(2462013YJRC034)
【分类号】：P314;P542;P597.3

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