龙门山断裂活动和川西高原隆升历史的裂变径迹测年

杨农; 张岳桥

龙门山断裂活动和川西高原隆升历史的裂变径迹测年

杨农^{1, 2},
张岳桥^{1, 2}

1.
国土资源部新构造运动与地质灾害重点实验室, 北京 100081
2.
中国地质科学院地质力学研究所, 北京 100081

基金项目:

本文为科技部973课题"龙门山地质构造断裂带及其与汶川蕴震动力条件分析" 2008CB425702

详细信息

作者简介:
杨农(1962-2010), 男, 研究员, 主要从事区域地质, 构造地质研究

中图分类号: P542⁺.3;P546;P542⁺1
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- HTML全文浏览量: 90
- PDF下载量: 29
- 被引次数: 0
出版历程
- 收稿日期: 2010-12-09
- 刊出日期: 2010-12-28

TISSION-TRACK DATING FOR ACTIVITY OF THE LONGMENSHAN FAULT ZONE AND UPLIFTING OF THE WESTERN SICHUAN PLATEAU

YANG Nong^{1, 2},
ZHANG Yueqiao^{1, 2}

1.
Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resources, Beijing, 100081, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China

摘要

摘要: 通过12个构造岩、变质砂岩和花岗岩样品的磷灰石裂变径迹测年年龄分析, 结合前人研究成果, 初步确定了青藏高原东缘龙门山地区晚新生代主要断裂活动时期和区域隆升历史。结果表明, 龙门山逆冲推覆构造带2条主断裂:汶川-茂县断裂和映秀-北川断裂, 最晚一次强烈活动发生在早更新世(FT年龄为1.2~ 1.3 Ma), 高原内部北西向米亚罗断裂在中更新世(约0.5 Ma)发生过强烈活动; 后龙门山逆冲推覆构造带在中新世晚期开始快速隆升, 而高原内部强烈隆升发生在上新世末至中更新世。高原隆升导致深切河谷地貌的形成和发育。
- 晚新生代 /
- 川西高原 /
- 龙门山断裂带 /
- 隆升 /
- 裂变径迹测年
Abstract: Twelve samples of tectonites, metasediments and granites taken from the western Sichuan Plateau were dated in this study by apatite fission track dating method. The results are used to reconstruct uplifting history and fault activity of the Longmenshan tectonic belt in eastern margin of the Tibetan Plateau. It is shown that the recent activity of the two major boundary faults:the Wenchuan-Maowen fault and the Yingxiu-Beichuan fault, occurred in early Pleistocene (FT ages of 1.2~1.3 Ma); the Miyaluo fault developed in the interior of the plateau was strongly active in middle Pleistocene (around 0.5 Ma); the back Longmenshan tectonic zone started to uplift in Miocene; and the interior of the plateau began rapid uplift in latest Pliocene to Middle Pleistocene. The uplifting of the plateau caused formation of deep-incised river morphology.
- Late Cenozoic /
- western Sichuan Plateau /
- Longmenshan fault zone /
- Uplift /
- apatite fission track dating

HTML全文

图 1 川西高原裂变径迹测年数据分布与地质简图

1.中生代侵入体; 2.前中生代侵入体; 3.第四系; 4.古近系、新近系; 5.侏罗系、白垩系; 6.三叠系; 7.古生界; 8.元古宙; 9.断裂, WMF:汶川-茂县断裂, YBF:映秀-北川断裂, GAF:都江堰市-安县断裂; MYLF:米亚罗断裂, SPGF:松坪沟断裂; 10.高程点及高程值; 11.本次测试磷灰石裂变径迹年龄及样品编号; 12.U-TH/He测年数据, 据Kirby et al. (2002); 13.裂变径迹数据, 据Arne D. (1997), (a)为磷灰石数据, (z)为锆石数据; 14.A-A':图 3剖面位置、B-B':图 2剖面位置。

Figure 1. Sketch map of geology with fission-track ages in Western Sichuan Plateau

下载: 全尺寸图片幻灯片

图 2 FT1~3样品位置地形构造剖面图

PδO:二叠纪石英闪长岩; Sm:志留系茂县群; Nh:南华系苏雄组; Pt₂:中元古代黄水河群; Pt₁:早元古代康定群; Pt₁ N:早元古代铁镁质岩

Figure 2. Topographic profile and location of Samples FT1~3

下载: 全尺寸图片幻灯片

图 3 FT9~FT15样品位置地形构造剖面图

γδο:燕山期岩体; T:三叠系

Figure 3. Topographic profile showing location of samples FT9~FT15

下载: 全尺寸图片幻灯片

表 1 磷灰石裂变径迹样品数据表

Table 1. Results of apatite fission track dating

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