南祁连奥陶纪花岗岩锆石U-Pb年龄及地质意义

廖华; 胡道功; 张绪教; 余文林; 郭涛

南祁连奥陶纪花岗岩锆石U-Pb年龄及地质意义

1.
中国地质大学地球科学与资源学院, 北京 100083
2.
中国地质科学院地质力学研究所, 北京 100081

基金项目:

祁连山冻土区天然气水合物资源勘查项目 GZHL20120301

详细信息

作者简介:
廖华(1989-), 女, 硕士研究生, 地质工程专业。E-mail:hualiao0711@163.com

中图分类号: P597
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出版历程
- 收稿日期: 2014-04-11
- 刊出日期: 2014-09-01

ZIRCON U-Pb AGE FOR GRANITE OF THE ORDOVICIAN FORMATION AND ITS TECTONIC SIGNIFICANCE IN THE SOUTHERN QILIAN

1.
School of Geosciences and Resources, China university of Geosciences, Beijing 100083, China
2.
Institute of Geomechanics, Chinese Academy of Geological Science, Beijing 100081, China

摘要

摘要: 加里东运动是祁连山早古生代以来较为重要的构造变形期, 其中以发生在晚志留世与早泥盆世之间的构造活动最为强烈。在加里东早期开始有花岗岩类侵入体涌现, 到加里东晚期时, 南祁连出现较发育的中-酸性侵入岩, 并尤以南祁连西段较为集中, 这些岩体见于哈拉湖周围以及阳康、织合玛等地。应用激光烧蚀多接收器电感耦合等离子体质谱仪(LA-MC-ICPMS)方法, 对南祁连扫迪南部侵位于志留系巴龙贡葛尔组(Sb)中的花岗岩体进行了精确的锆石U-Pb定年研究, 结果表明, 花岗岩中锆石²⁰⁶Pb/²³⁸U年龄平均值为461.5±1.6 Ma, 指示扫迪南花岗岩体的地质时代属中奥陶世晚期, 故巴龙贡葛尔组(Sb)时代应该早于中奥陶世。
- 花岗岩 /
- 锆石U-Pb年龄 /
- 奥陶纪 /
- 南祁连
Abstract: Caledonian movement is a very important tectonic deformation stage since the Early Paleozoic in Qilian. The most intense tectonic activity began to emerge between the late Silurian and Early Devonian. The granitic intrusive began to emerge in early Caledonian movement. To the late Caledonian movement, South Qiian is developed in neutral-acidic intrusive rocks, and especially in the south western part of Qilian is relatively concentrated, the rock mass around in Hala Lake and Yangkang, Zhihema, etc. We made zircon U-Pb dating for granite by LA-MC-ICPMS. Zircon U-Pb age determination results show that, the formation of granite at the age of 461.5±1.6 Ma. It indicates that the geological age of granite in Saodi belongs to Middle Ordovician. Thus, the Balonggonggeer Formation should be earlier than the Middle Ordovician.
- granite /
- zircon U-Pb age /
- Ordovician /
- southern Qilian

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图 1 祁连山地质构造略图^[9]

Figure 1. Tectonic map of Qilian Mountain

下载: 全尺寸图片幻灯片

图 2 德令哈北部地区地质简图

1—第四系；2—第三纪白杨河组；3—早白垩犬牙沟组；4—中晚侏罗世采石岭组—红水沟组；5—晚三叠世默勒群；6—早—中三叠世郡子河群；7—二叠世巴音河群；8—二叠世—石炭世中吾农山群；9—志留系巴龙贡葛尔组；10—中—晚奥陶世盐池湾组；11—早奥陶世吾力沟组；12—古元古代金水口岩群；13—花岗闪长岩；14—二长花岗岩；15—钾长花岗岩；16—角度不整合；17—断裂；18—样品号及采样点位置

Figure 2. A geological map of north Delingha

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图 3 祁连山扫迪南花岗岩的锆石阴极发光图像

Figure 3. CL images of zircons from granite rocks in south of Saodi Formation in Qilianshan

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图 4 花岗岩锆石U-Pb年龄谐和图和均值图

Figure 4. U-Pb concordia diagram of zircons from granite rocks from south of Saodi Formation in Qilianshan

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表 1 花岗岩锆石LA-MC-ICPMS U-Pb同位素年龄测定结果

Table 1. LA-MC-ICPMS U-Pb isotopic age data for zircons from granite rocks

测点	元素含量/(μg·g^-1)		Th/U	同位素原子比率						表面年龄/Ma
测点	Pb	U	Th/U	²⁰⁶Pb/²³⁸U	1 σ	²⁰⁷Pb/²³⁵U	1 σ	²⁰⁷Pb/²⁰⁶Pb	1 σ	²⁰⁶Pb/²³⁸U	1 σ
1.1	42	561	0.38	0.0744	0.0008	0.5715	0.0093	0.0557	0.0009	463	5
1.2	44	561	0.47	0.0746	0.0006	0.5932	0.0115	0.0577	0.0010	464	4
1.3	31	400	0.43	0.0740	0.0005	0.5806	0.0110	0.0568	0.0010	460	3
1.4	44	579	0.33	0.0743	0.0005	0.5867	0.0085	0.0573	0.0008	462	3
1.5	45	583	0.30	0.0754	0.0005	0.5865	0.0086	0.0565	0.0008	468	3
1.6	55	660	0.28	0.0806	0.0008	0.6467	0.0091	0.0582	0.0008	500	5
1.7	54	690	0.35	0.0741	0.0004	0.5826	0.0079	0.0570	0.0008	461	2
1.8	76	1021	0.18	0.0744	0.0004	0.5812	0.0075	0.0566	0.0007	463	3
1.9	64	836	0.28	0.0743	0.0004	0.5862	0.0083	0.0572	0.0008	462	2
1.11	32	419	0.32	0.0738	0.0004	0.5734	0.0120	0.0564	0.0012	459	2
1.12	36	473	0.25	0.0747	0.0004	0.5982	0.0099	0.0580	0.0009	465	2
1.13	29	380	0.35	0.0733	0.0004	0.5670	0.0112	0.0561	0.0011	456	2
1.14	36	467	0.46	0.0737	0.0004	0.5777	0.0092	0.0568	0.0009	459	2
1.15	37	489	0.30	0.0744	0.0003	0.5894	0.0100	0.0574	0.0010	463	2
1.16	35	471	0.49	0.0703	0.0003	0.5428	0.0094	0.0560	0.0009	438	2
1.17	55	736	0.48	0.0719	0.0003	0.5429	0.0072	0.0548	0.0007	447	2
1.18	59	784	0.35	0.0747	0.0006	0.5722	0.0084	0.0556	0.0008	464	4
1.19	78	1023	0.36	0.0741	0.0005	0.5906	0.0081	0.0578	0.0008	461	3

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