郯庐断裂带对鲁西隆升过程的影响:磷灰石裂变径迹证据

发布时间：2018-03-07 06:33

本文选题：磷灰石裂变径迹　切入点：新生代　出处：《岩石学报》2016年04期 　论文类型：期刊论文

【摘要】：郯庐断裂带(TLFZ)是一条贯穿华北的NNE向巨型断裂带。新生代以来,在郯庐断裂带的两侧及其内部发生了显著的伸展构造变形,形成了泰安-莱芜-蒙阴NW向断陷盆地群,并使鲁西块体发生了急剧的陆内伸展隆升。本文在前人研究的基础上,分别在鲁西沂山、徂徕山和蒙山三处进行了大量的样品采集,总计完成了25个样品的测试,获得了一系列新的磷灰石裂变径迹(AFT)年代学结果。结合前人已发表的裂变径迹结果,对鲁西地区新生代与伸展变形有关的剥露-隆升作用的时空分布特征、隆升剥露模式及隆升幅度进行分析,并揭示郯庐断裂带在鲁西新生代热隆升过程中的影响。主要认识有:1)新生代以来,鲁西主要经历了始新世-早渐新世和新近纪以来两期快速剥露-隆升阶段。2)始新世-早渐新世主要表现为幕式差异性快速剥露-隆升,鲁西南受NW向断层控制形成向北、向东的掀斜抬升作用,鲁西北受NE向断裂控制,形成向北、向西的掀斜抬升作用。新近纪以来,进入相对低速区域性剥露-隆升阶段。3)AFT模拟显示,与始新世-早渐新世的幕式快速剥露-隆升相比,中新世以来,鲁西剥露-隆升速率相对减小,但剥蚀量剥露-抬升量较大。故鲁西整体抬升于中新世以来。4)结合前人研究成果,新生代以来,鲁西宏观上受郯庐断裂带伸展活动影响,越靠近郯庐断裂带剥蚀量越大,局部受NW或NE向断裂控制。
[Abstract]:The Tan-Lu fault zone (TLFZ) is a giant NNE fault zone running through North China. Since the Cenozoic, significant extensional tectonic deformation occurred on both sides of the Tan-Lu fault zone and its interior, resulting in the formation of Taian-Laiwu-Mengyin NW trending faulted basin group. On the basis of previous studies, a large number of samples were collected in Luxi Mountain, Culai Mountain and Mengshan respectively, and a total of 25 samples were tested. A series of new apatite fission track (AFT) geochronology results have been obtained. Based on the previous fission track results, the temporal and spatial distribution characteristics of denudation and uplift associated with extensional deformation in the Cenozoic in the western Shandong region are studied. The model of uplift and exfoliation and the extent of uplift are analyzed, and the influence of Tan-Lu fault zone on the process of Cenozoic thermal uplift in western Shandong is revealed. West Shandong mainly experienced two periods of rapid exfoliation-uplift stage since the Eocene to early Oligocene and since Neogene. 2) the Eocene to early Oligocene was mainly characterized by the rapid exfoliation and uplift of curtain type difference, and the southwest of Shandong was controlled by NW fault to form northward. The northwestern Shandong Province is controlled by NE trending faults, forming a northward and westward tilting uplift. Since the Neogene, it has entered a relatively low speed regional denudation and uplift stage. The AFT simulation shows that, Compared with the rapid exfoliation and uplift of the Eocene to early Oligocene, the rate of exfoliation and uplift in the west of Luxi has been relatively reduced since the Miocene. However, the denudation amount is relatively large. Therefore, the whole uplift of the west of Luxi occurred since the Miocene. 4) combined with the previous research results, since the Cenozoic, the extension activity of the Tanlu fault zone has affected the west of Shandong macroscopically, and the denudation amount near the Tan-Lu fault zone has increased. Locally controlled by NW or NE trending faults.
【作者单位】：海底科学与探测技术教育部重点实验室;中国海洋大学海洋地球科学学院;
【基金】：国家自然科学基金项目(41325009、41190072) 中国地质调查局项目(1212011120099) 泰山学者特聘教授项目鳌山卓越科学家项目联合资助
【分类号】：P542

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