河北赞皇杂岩官都群碎屑沉积岩锆石SHRIMPU-Pb定年及其地质意义

张帆; 王彦斌; 杨崇辉; 杜利林; 苑鸿庆

河北赞皇杂岩官都群碎屑沉积岩锆石SHRIMPU-Pb定年及其地质意义

1.
中国地质科学院地质研究所, 北京 100037

2.
中国科学院地质与地球物理研究所, 北京 100029

基金项目:
国家自然科学基金项目《全球岩浆静寂期（2.4~2.3Ga）的岩浆活动——以华北克拉通为例》（批准号：41572175）和中国地质调查局项目《华北陆块中部和东部前寒武纪构造带基础地质调查》（编号：DD20190003）、《华北克拉通中部新太古代—古元古代构造转折期的岩浆事件——地层格架及赞皇地区1：5万专题填图》（编号：DD20160121）

详细信息

作者简介: 张帆(1990-), 男, 博士, 从事岩石地球化学和地质年代学研究。E-mail:zhangfan2294@163.com

通讯作者: 王彦斌(1966-), 男, 研究员, 从事同位素地质年代学和地球化学研究工作。E-mail:yanbinw@cags.ac.cn

中图分类号: P588.21;P597⁺.3

收稿日期: 2019-01-10

修回日期: 2019-03-17

刊出日期: 2019-08-15

SHRIMP U-Pb zircon dating of clastic sedimentary rocks of the Guandu Group, Zanhuang Complex, Hebei Province, and its geological significance

1.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

2.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

More Information

Corresponding author: WANG Yanbin, yanbinw@cags.ac.cn

Received Date: 10 January 2019

Revised Date: 17 March 2019

Publish Date: 15 August 2019

摘要

摘要:
新太古代-古元古代表壳岩系在华北克拉通广泛发育，在赞皇地区也出露有较典型的中低级变质的火山-沉积岩系，即从原赞皇群解体出来的官都群，其形成时代和成因目前仍有争议。官都群的主要岩石组合为变基性火山岩（包括角闪片岩和斜长角闪岩）、大理岩、石英片岩，以及一系列长英质副片麻岩等。对其中的长英质副片麻岩进行碎屑锆石定年研究，并结合前人已报道的碎屑锆石数据可知，碎屑锆石年龄主要峰值约为2.5Ga，部分样品出现2.0~2.2Ga的峰值。变质锆石记录主要有2个范围，分别为2.48Ga左右和1.85~1.9Ga，可能代表了2期不同的构造热事件记录。结合该地区近年来的研究，可以得到如下认识：①样品中存在形态完好的长柱状锆石，表明是近源沉积；②约2.48Ga的变质记录与核部岩浆锆石的年龄（约2.5Ga）非常接近，可能代表了物源区中酸性岩体侵位后遭受的一次构造热事件，而不代表沉积岩形成后遭受变质的记录，即沉积过程晚于2.48Ga；③官都群至少有一部分岩石组合形成于古元古代；④官都群可能是不同时代、不同岩性单元拼贴而成，需要进一步解体。
- 碎屑锆石 /
- SHRIMP U-Pb定年 /
- 官都群 /
- 赞皇杂岩 /
- 华北克拉通
Abstract:
The Neoarchean-Paleoproterozoic supercrustal rocks as well as the Guandu Group from Zanhuang Complex have been widely reported in the whole North China Craton. The formation age and the environment of the Guandu Group are still controversial. Zircon SHRIMP U-Pb data of clastic sedimentary rocks of the Guandu Group, combined with previously available detrital zircon data, reveal that the majority of detrital ages are at~2.5Ga, with 2.0~2.2Ga peak for some samples. At least two metamorphic events were recorded, i.e., ~2.48Ga and 1.85~1.9Ga. Based on data obtained in this study as well as other studies of the Zanhuang Complex in recent years, some conclusions can be drawn as follows:① The well-preserved elongate prismatic morphology of some zircons implies that the source of depositional materials was not far away; ② The~2.48Ga metamorphic record is so close to the crystallization age of inner cores of zircons (~2.5Ga), probably suggests the existence of metamorphism that happened soon after the formation of the igneous rocks before the deposition of Guandu Group rocks, i.e., the deposition happened after~2.48Ga; ③ At least part of the Guandu Group was formed in Paleoproterozoic instead of late Archean; ④ The Guandu Group was probably not a continuous stratigraphic unit, but was composed of lithological units formed in different epochs and environments, and it thus should be disintegrated.
- detrital zircon /
- SHRIMP U-Pb dating /
- Guandu Group /
- Zanhuang Complex /
- North China Craton

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图 1 赞皇杂岩区域地质图^{[3, 5, 7]}

Figure 1.

下载: 全尺寸图片幻灯片

图 2 官都群的东部地质剖面和采样位置

Figure 2.

下载: 全尺寸图片幻灯片

图 3 官都群碎屑沉积岩样品D0532-1和D0533-9野外（a、b）及镜下照片（c、d）

Figure 3.

下载: 全尺寸图片幻灯片

图 4 官都群沉积岩样品D0532-1(a)和D0533-9(b)锆石阴极发光图像和年龄值

Figure 4.

下载: 全尺寸图片幻灯片

图 5 官都群沉积岩样品锆石U-Pb谐和图

Figure 5.

下载: 全尺寸图片幻灯片

图 6 前人已发表的官都群变质沉积岩样品锆石U–Pb谐和图和年龄分布直方图

Figure 6.

下载: 全尺寸图片幻灯片

表 1 官都群变质沉积岩样品锆石SHRIMP U-Th-Pb年龄数据

Table 1. SHRIMP U-Th-Pb ages of zircons from the meta-sedimentary rocks of the Guandu Group

测点	U/10^-6	Th/10^-6	Th/U	²⁰⁶Pb^*	²⁰⁷Pb^/²⁰⁶Pb^	1σ	²⁰⁷Pb^/²³⁵U^	1σ	²⁰⁶Pb/²³⁸U^	1σ	错误校正	²⁰⁶Pb/²³⁸U/Ma	1σ	²⁰⁷Pb/²⁰⁶Pb年龄/Ma	1σ	不谐和度/%
D0533-9
D0533-9-1.1	804	20	0.03	264	0.1524	1.79	7.970	3.1	0.3794	2.52	0.82	2074	45	2388	30	13
D0533-9-2.1	306	20	0.07	126	0.1619	0.46	10.679	0.9	0.4784	0.75	0.85	2520	16	2487	9	-1
D0533-9-3.1	939	3	0	319	0.1627	0.30	8.796	1.0	0.3921	0.96	0.95	2133	18	2509	6	15
D0533-9-4.1	865	20	0.02	341	0.1593	0.29	10.012	0.8	0.4558	0.70	0.92	2421	14	2462	6	2
D0533-9-5.1	1232	14	0.01	458	0.1597	0.30	9.420	0.8	0.4278	0.77	0.93	2296	15	2475	7	7
D0533-9-6.1	222	13	0.06	86	0.1647	0.71	10.169	1.1	0.4479	0.81	0.75	2386	16	2503	13	5
D0533-9-7.1	838	17	0.02	231	0.1593	0.33	7.026	0.7	0.3199	0.66	0.89	1789	10	2448	7	27
D0533-9-8.1	301	16	0.05	126	0.1641	0.46	10.976	1.1	0.4850	1.03	0.91	2549	22	2508	8	-2
D0533-9-9.2	550	25	0.05	157	0.1477	0.43	6.729	0.8	0.3303	0.67	0.84	1840	11	2332	8	21
D0533-9-10.1	1273	478	0.39	249	0.1583	0.31	4.993	0.7	0.2287	0.64	0.90	1328	8	2300	10	42
D0533-9-11.1	246	101	0.42	107	0.1756	0.48	12.210	1.1	0.5042	0.95	0.89	2632	22	2591	11	-2
D0533-9-12.1	297	17	0.06	123	0.1645	0.46	10.904	0.9	0.4809	0.75	0.85	2531	16	2508	9	-1
D0533-9-13.1	343	92	0.28	106	0.1587	1.96	7.847	2.2	0.3586	0.98	0.45	1976	30	2408	35	18
D0533-9-14.1	259	26	0.1	97	0.1597	0.49	9.526	1.0	0.4326	0.90	0.88	2317	18	2458	10	6
D0533-9-15.1	499	51	0.11	176	0.1475	0.50	8.082	0.9	0.3975	0.69	0.81	2158	14	2483	10	13
D0533-9-16.1	330	248	0.78	139	0.1627	0.44	11.008	0.9	0.4908	0.74	0.86	2574	17	2488	8	-3
D0533-9-17.1	763	19	0.03	139	0.1286	6.20	3.741	8.2	0.2109	5.44	0.66	1234	62	2059	111	40
D0533-9-18.1	747	145	0.2	327	0.1609	0.50	11.177	0.9	0.5040	0.71	0.82	2631	16	2472	11	-6
D0533-9-19.1	248	164	0.68	104	0.1627	0.50	10.917	0.9	0.4866	0.78	0.84	2556	18	2494	8	-2
D0533-9-20.1	356	5	0.01	105	0.1562	0.57	7.348	0.9	0.3412	0.76	0.80	1893	13	2429	11	22
D0533-9-21.1	295	215	0.75	123	0.1605	0.47	10.700	1.3	0.4834	1.17	0.93	2542	27	2472	8	-3
D0532-1
D0532-1-1.1	166	134	0.83	67	0.1782	0.58	11.735	1.0	0.4775	0.86	0.83	2517	20	2505	11	0
D0532-1-2.1	60	33	0.57	27	0.1646	0.96	11.649	1.5	0.5132	1.19	0.78	2670	28	2562	15	-4
D0532-1-3.1	120	79	0.67	51	0.1668	0.73	11.401	1.2	0.4957	0.95	0.79	2595	23	2493	13	-4
D0532-1-4.1	407	299	0.76	154	0.1799	0.40	11.139	0.8	0.4492	0.73	0.87	2392	16	2479	9	4
D0532-1-5.1	170	105	0.64	70	0.1591	0.62	10.453	1.1	0.4766	0.88	0.82	2513	20	2442	11	-3
D0532-1-6.1	231	202	0.9	88	0.1658	0.49	10.190	1.7	0.4457	1.67	0.96	2376	40	2422	11	2
D0532-1-7.1	213	207	1.01	68	0.1522	0.62	7.854	1.1	0.3742	0.89	0.82	2049	19	2341	15	12
D0532-1-8.1	243	343	1.46	74	0.1637	0.57	7.955	1.0	0.3523	0.79	0.81	1946	17	2440	14	20
D0532-1-9.1	73	66	0.94	31	0.1590	0.93	10.951	1.5	0.4994	1.13	0.77	2611	28	2479	15	-5
D0532-1-10.1	192	171	0.92	79	0.1648	0.57	10.809	1.2	0.4758	1.08	0.88	2509	26	2515	10	0
D0532-1-11.1	121	64	0.55	51	0.1645	0.77	11.184	1.2	0.4932	0.93	0.77	2585	21	2515	16	-3
D0532-1-12.1	158	78	0.51	68	0.1637	0.63	11.324	1.1	0.5018	0.86	0.81	2622	20	2515	10	-4
D0532-1-13.1	91	82	0.93	38	0.1608	0.86	10.807	1.3	0.4875	1.02	0.77	2560	25	2500	16	-2
D0532-1-14.1	332	239	0.74	128	0.1655	0.44	10.229	0.9	0.4484	0.77	0.87	2388	17	2515	8	5
D0532-1-14.2	171	67	0.41	69	0.1584	0.58	10.202	1.0	0.4670	0.84	0.82	2471	18	2473	11	0
D0532-1-15.1	148	53	0.37	64	0.1695	0.60	11.731	1.1	0.5020	0.88	0.82	2622	20	2553	11	-3
注：Pb ^表示放射性成因铅，不谐和度=1-100 ^(²⁰⁶Pb/²³⁸U)age/(²⁰⁷Pb/²⁰⁶Pb)_age

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