青藏高原拉萨地块发现古元古代地体

何世平; 李荣社; 王超; 张宏飞; 计文化; 于浦生; 辜平阳; 时超

doi:10.3799/dqkx.2013.052

青藏高原拉萨地块发现古元古代地体

doi: 10.3799/dqkx.2013.052

1.
西安地质矿产研究所, 陕西西安 710054
2.
中国地质大学地球科学学院, 湖北武汉 430074

基金项目:

中国地质大调查项目"青藏高原前寒武纪地质、古生代构造-古地理综合研究" 1212010610102

详细信息

作者简介:
何世平(1963-), 男, 研究员, 主要从事大地构造、地球化学研究.E-mail: xakeyi@163.com

中图分类号: P587;P597⁺.3
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出版历程
- 收稿日期: 2012-05-11
- 刊出日期: 2013-05-15

Discovery of the Paleoproterozoic Terrane in Lhasa Block, Qinghai-Tibet Plateau

1.
Xi'an Institute of Geology and Mineral Resources, Xi'an 710054, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 拉萨地块东部呈断块状分布的松多岩群包括岔萨岗岩组、马布库岩组和雷龙库岩组, 对其形成时代存在较大分歧.通过高精度的LA-ICP-MS(激光剥蚀等离子体质谱仪)锆石微区原位U-Pb同位素测年, 西藏工布江达县一带岔萨岗岩组变基性火山岩中获得2 450.3±9.9 Ma的不一致线上交点年龄, 为原岩形成时代, 属于古元古代早期, 是目前拉萨地块获得的最老基底同位素年龄值.依据野外调研和新获得的同位素年代学数据, 结合新近完成的区域地质调查资料, 建议将原"松多岩群"解体, 新建工布江达岩群(Pt₁Gb), 松多岩群仅保留马布库岩组(AnOm)和雷龙库岩组(AnOl).拉萨地块古元古代地体的发现, 对重新厘定该区前寒武纪基底格架、区域对比、构造归属划分以及寻找与前寒武纪相关的矿产具有重要意义.
- 拉萨地块 /
- 松多岩群 /
- 古元古代早期 /
- 锆石U-Pb年代学 /
- 地球化学
Abstract: Songduo rock group includes Chashagang rock formation, Mabuku rock formation and Leilongku rock formation, which takes on fault blocks locating in the eastern Lhasa block, and its age has long been argued. The high accurate LA-ICP-MS zircon U-Pb isotope dating of meta-basic volcanic rock from Chashagang rock formation in Gongbujiangda County, Tibet, yielded a U-Pb upper-intercept age of 2 450.3±9.9 Ma. It is suggested a rock-forming age and the oldest isotopic age of basement of Lhasa block, belonging to the Early Paleoproterozoic. According to field investigation and the new data of geochronology, combining with new results from regional geological survey, we propose that "the original Songduo rock group" should be disintergrated, and re-establish a Gongbujiangda rock group. The Songduo rock Group only remain Mabuku rock formation (AnOm) and Leilongku rock Formation (AnOl). It is great significance to redefinite the Precambrian basement framework, compare in region, subdivide tectonic units, and find minerals related with the Precambrian.
- Lhasa block /
- Songduo rock group /
- Early Paleoproterozoic /
- zircon U-Pb geochronology /
- geochemistry

HTML全文

图 1 拉萨地块东部西藏工布江达县一带地质简图

1.新生界；2.中生界；3.上古生界；4.下古生界；5.前奥陶系松多岩群雷龙库岩组；6.前奥陶系松多岩群马布库岩组；7.前奥陶系松多岩群岔萨岗岩组；8.中新元古界念青唐古拉岩群；9.中新元古界林芝岩群；10.古近纪花岗岩；11.白垩纪花岗闪长岩；12.侏罗纪花岗闪长岩；13.三叠纪花岗闪长岩；14.缝合带及编号；15.断裂/推测断裂；16.公路/水系；17.研究区范围；18.采样位置及编号；①康西瓦-木孜塔格-玛沁-勉县-略阳缝合带；②西金乌兰-金沙江缝合带；③班公湖-怒江缝合带；④雅鲁藏布江缝合带

Fig. 1. Earstern Lhasa block in Gongbujiangda County, Tibet

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图 2 松多岩群岔萨岗岩组变基性火山岩锆石CL图像(单位: Ma)

锆石中的圆圈为同位素测年激光剥蚀的示意范围, 相应的编号为测点号, 其他数字为²⁰⁷Pb/²⁰⁶Pb年龄和误差

Fig. 2. CL images of zircons from meta-basic volcanic rock in Chasagang rock formation of Songduo rock group

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图 3 松多岩群岔萨岗岩组变基性火山岩锆石U-Pb年龄谐和图(单位: Ma)

Fig. 3. U-Pb concordia diagram of zircons from meta-basic volcanic rock in Chasagang rock formation of Songduo rock group

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图 4 拉萨地块东段西藏工布江达县一带前寒武系分布

1.显生宇；2.前奥陶系松多岩群雷龙库岩组(AnOl)；3.前奥陶系松多岩群马布库岩组(AnOm)；4.中新元古界林芝岩群(Pt_2-3L)；5.中新元古界念青唐古拉岩群(Pt_2-3N)；6.古元古代工布江达岩群(Pt₁Gb)

Fig. 4. Precambrian of the eastern Lhasa block in Gongbujiangda County, Tibet

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表 1 拉萨地块松多岩群岔萨岗岩组变基性火山岩单颗粒锆石LA-ICP-MS U-Pb同位素测年结果

Table 1. The results of the LA-ICP-MS U-Pb isotopic dating for the single-grain zircon from meta-basic volcanic rock in Chasagang rock formation of Songduo rock group

样点编号	同位素比值						同位素年龄(Ma)										同位素含量(μg·g^-1)						Th/U
	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th		²⁰⁴Pb	²⁰⁶Pb	²⁰⁷Pb	²⁰⁸Pb	²³²Th	²³⁸U
	比值	1σ	比值	1σ	比值	1σ	比值	1σ	年龄	1σ	年龄	1σ	年龄	1σ	年龄	1σ	²⁰⁴Pb	²⁰⁶Pb	²⁰⁷Pb	²⁰⁸Pb	²³²Th	²³⁸U
07SD-1-01	0.160	0.002	9.451	0.095	0.427	0.004	0.135	0.001	2 442	25	2 370	10	2 288	19	2 269	22	9.45	1 396.42	270.39	33.06	107.13	749.63	0.14
07SD-1-02	0.162	0.002	9.879	0.098	0.443	0.005	0.166	0.002	2 335	30	2 331	12	2 326	21	2 325	25	56.67	2 251.40	457.53	145.75	426.92	1 101.38	0.39
07SD-1-03	0.156	0.002	9.264	0.091	0.431	0.004	0.120	0.001	2 414	8	2 364	9	2 308	20	2 292	19	0.64	1 613.01	297.31	25.27	88.32	855.13	0.10
07SD-1-04	0.171	0.002	6.137	0.060	0.261	0.003	0.017	0.000	2 564	8	1 996	9	1 494	14	343	3	96.49	4 052.15	816.52	121.47	2 977.47	3 545.16	0.84
07SD-1-05	0.159	0.002	11.010	0.108	0.503	0.005	0.114	0.001	2 442	8	2 524	9	2 628	22	2 190	18	13.86	2 658.65	498.21	29.72	108.97	1 205.73	0.09
07SD-1-06	0.161	0.002	10.963	0.111	0.493	0.005	0.118	0.001	2 471	8	2 520	9	2 582	22	2 253	19	12.05	854.52	167.70	95.72	318.65	387.25	0.82
07SD-1-08	0.160	0.002	10.744	0.105	0.488	0.005	0.132	0.001	2 451	8	2 501	9	2 564	22	2 501	21	9.88	2 008.55	378.45	48.02	152.99	938.58	0.16
07SD-1-09	0.161	0.002	10.400	0.105	0.469	0.005	0.107	0.001	2 465	8	2 471	9	2 479	21	2 050	18	4.95	1 313.06	257.92	90.84	307.79	566.64	0.54
07SD-1-10	0.157	0.002	11.152	0.109	0.514	0.005	0.094	0.001	2 428	8	2 536	9	2 673	22	1 823	15	69.29	2 908.02	540.55	66.62	296.25	1 291.61	0.23
07SD-1-11	0.157	0.002	10.265	0.100	0.474	0.005	0.095	0.001	2 423	8	2 459	9	2 503	21	1 841	15	4.35	3 154.28	584.50	69.57	306.21	1 517.30	0.20
07SD-1-12	0.162	0.002	9.125	0.090	0.409	0.004	0.041	0.000	2 475	8	2 351	9	2 209	19	809	7	46.89	3 245.91	620.57	45.66	469.18	1 812.20	0.26
07SD-1-13	0.161	0.002	11.404	0.112	0.514	0.005	0.116	0.001	2 464	8	2 557	9	2 676	22	2 221	18	6.85	2 867.96	544.55	211.02	762.45	1 272.40	0.60
07SD-1-14	0.157	0.002	11.405	0.112	0.526	0.005	0.110	0.001	2 426	8	2 557	9	2 725	23	2 118	17	＜0.54	2 468.11	458.36	42.40	161.09	1 070.86	0.15
07SD-1-15	0.161	0.002	10.473	0.104	0.471	0.005	0.137	0.001	2 470	8	2 478	9	2 487	21	2 600	22	1 312.01	4 112.61	1 795.75	1 301.97	1 360.04	1 594.78	0.85
07SD-1-16	0.161	0.002	11.208	0.110	0.504	0.005	0.137	0.001	2 470	8	2 541	9	2 631	22	2 597	21	17.37	2 331.49	444.17	71.48	218.79	1 056.02	0.21
07SD-1-17	0.155	0.002	9.540	0.094	0.447	0.005	0.111	0.001	2 401	8	2 391	9	2 381	20	2 124	17	＜0.57	1 040.14	190.25	57.98	219.58	531.41	0.41
07SD-1-18	0.160	0.002	10.038	0.099	0.455	0.005	0.109	0.001	2 457	8	2 438	9	2 416	21	2 098	17	＜0.37	904.78	171.07	110.25	423.09	454.11	0.93
07SD-1-19	0.161	0.002	9.641	0.095	0.434	0.004	0.116	0.001	2 468	8	2 401	9	2 323	20	2 219	19	4.23	1 422.05	270.73	39.45	142.68	748.25	0.19
07SD-1-20	0.159	0.002	10.365	0.101	0.474	0.005	0.115	0.001	2 442	8	2 468	9	2 500	21	2 204	18	15.54	2 737.95	513.11	86.62	315.55	1 319.08	0.24
07SD-1-21	0.161	0.002	10.328	0.101	0.465	0.005	0.092	0.001	2 468	8	2 465	9	2 461	21	1 779	15	14.74	2 940.46	559.63	41.91	191.20	1 443.80	0.13
07SD-1-22	0.164	0.002	11.338	0.112	0.502	0.005	0.107	0.001	2 497	8	2 551	9	2 621	22	2 054	17	56.92	2 445.83	492.93	208.87	670.04	1 077.87	0.62
07SD-1-23	0.156	0.002	11.159	0.109	0.517	0.005	0.115	0.001	2 418	8	2 536	9	2 688	22	2 193	18	1.86	2 481.67	458.51	159.94	585.63	1 094.87	0.53
07SD-1-24	0.158	0.002	10.137	0.100	0.467	0.005	0.119	0.001	2 430	8	2 447	9	2 469	21	2 265	19	6.09	1 366.06	254.18	64.58	228.59	668.15	0.34
07SD-1-26	0.160	0.002	8.565	0.084	0.388	0.004	0.077	0.001	2 455	8	2 293	9	2 115	18	1 501	12	19.17	3 206.29	636.60	140.15	670.95	1 615.09	0.42
07SD-1-27	0.155	0.002	9.406	0.093	0.439	0.004	0.102	0.001	2 407	8	2 378	9	2 346	20	1 958	17	2.43	1 196.77	219.69	31.63	130.50	622.34	0.21
07SD-1-28	0.157	0.002	11.105	0.109	0.514	0.005	0.145	0.001	2 421	8	2 532	9	2 673	22	2 738	23	30.08	3 935.97	728.55	85.45	247.20	1 748.12	0.14
07SD-1-29	0.157	0.002	11.373	0.111	0.527	0.005	0.078	0.001	2 419	8	2 554	9	2 728	23	1 518	13	49.82	4 215.59	779.45	32.04	172.42	1 826.24	0.09
07SD-1-30	0.161	0.002	11.092	0.108	0.500	0.005	0.111	0.001	2 465	8	2 531	9	2 614	22	2 128	17	9.66	3 893.54	739.87	356.53	1 347.93	1 777.38	0.76
注: LA-ICP-MS U-Pb同位素含量和年龄测试在西北大学大陆动力学国家重点实验室完成, 使用Andersen(2002)的方法进行了普通铅校正, 谐和度=(²⁰⁷Pb/²⁰⁶Pb)/(²⁰⁶Pb/²³⁸U)×100.

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