浙赣三山地区早-中奥陶世斑脱岩SHR IMP锆石U-Pb精确定年

唐增才; 刘风龙; 董学发; 余盛强; 赵旭东; 胡开明; 陈忠大; 吴小勇

doi:10.3799/dqkx.2018.255

浙赣三山地区早-中奥陶世斑脱岩SHR IMP锆石U-Pb精确定年

doi: 10.3799/dqkx.2018.255

1.
浙江省地质调查院, 浙江杭州 311203
2.
中国地质大学地球科学学院, 湖北武汉 430074

基金项目:

中国地质调查局地质调查项目 1212011120834

浙江省国土资源厅项目 2010001

浙江省国土资源厅项目 2014004

中国地质调查局地质调查项目 12120114068901

详细信息

作者简介:
唐增才(1980-), 男, 高级工程师, 长期从事区域地质调查研究工作

中图分类号: P534.42;P542;P597.3
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- 被引次数: 0
出版历程
- 收稿日期: 2017-05-27
- 刊出日期: 2019-09-15

SHRIMP U-Pb Zircon Dating for the Early-Middle Ordovician K-Bentonites in Jiangshan-Changshan-Yushan, Zhejiang-Jiangxi Border Area

1.
Zhejiang Institute of Geological Survey, Hangzhou 311203, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 目前浙赣三山地区“金钉子”尚无精确的同位素年龄数据.基于钾质斑脱岩SHRIMP锆石U-Pb测试，三山地区早-中奥陶世宁国组Azygograptus suecicus带中部、Exigraptus clavus带底部、Acrograptus ellesae带中部的同位素年龄分别为482.9±6.1 Ma、477.6±8.3 Ma和467.0±4.4 Ma，为华南地区中奥陶世大坪阶和达瑞威尔阶底界的全球界线层型（GSSP）开展地层对比提供了精确的同位素年代学依据.结合生物带对比，大致将浙西地区早-中奥陶世普遍存在的地层缺失事件的发生时限界定于482.9~477.6 Ma之间，即杭州-嘉兴台地缺失牙形刺Oepikodus evae带-Lenodus anticariabilis带（或笔石Azygograptus suecicus带-Acrograptus ellesae带）地层，其代表了郁南运动在浙西地区的具体表现，拉开了华南地区早古生代构造运动的序幕，也可能是欧洲加里东造山过程中亨伯运动和塔康运动的远程响应.
- 年代学 /
- 地球化学 /
- 斑脱岩 /
- 奥陶纪 /
- 区域构造运动 /
- 三山地区
Abstract: There are no exact isotopic age data for "Golden Spike" in Jiangshan-Changshan-Yushan, Zhejiang-Jiangxi border area. The analysis of SHRIMP U-Pb zircons from the Ningkuo Formation K-bentonites in Jiangshan-Changshan-Yushan, yielded the age of middle Azygograptus suecicus Zone as 482.9±6.1 Ma, bottom Exigraptus clavus Zone as 477.6±8.3 Ma, and the middle Acrograptus ellesae Zone as 467.0±4.4 Ma, which provides the basis for exact correlation from the GSSP of Dapingian and Darriwilian strata in South China to other areas. Combined with contrast of biozones, the general strata-lost events occurred from 482.9 Ma to 477.6 Ma in West Zhejiang, which equated to the lacuna of the Oepikodus evae Zone to the Lenodus anticariabilis Zone, or Azygograptus suecicus Zone to Acrograptus ellesae Zone in Hangzhou-Jiaxing platform. We consider that it embodied the Yunan Movement in West Zhejiang, and heralded the start of the Early Paleozoic tectonic movement in South China, while responding to the Humberian Movement and Tactonic Movement in the European Caledonian Orogeny.
- chronology /
- geochemistry /
- K-bentonites /
- Ordovician /
- regional tectonic movement /
- Jiangshan-Changshan-Yushan area

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图 1 三山地区横塘水库和黄泥塘剖面位置

Fig. 1. Location of Huangnitang and Hengtang sections in Jiangshan-Changshan-Yushan area

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图 2 三山地区宁国组斑脱岩样品采集层位

Fig. 2. Stratigraphic position of the K-bentonites from Ningkuo Formation in Jiangshan-Changshan-Yushan area

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图 3 宁国组斑脱岩Zr/TiO₂-Nb/Y图解(a)和Nb-Zr图解(b)

图a据Winchester and Floyd（1977），图b据Leat et al.（1986）

Fig. 3. Zr/TiO₂ vs. Nb/Y diagram (a) and Nb vs. Zr diagram (b) for the K-bentonites in Ningkuo Formation

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图 4 宁国组斑脱岩稀土元素球粒陨石标准化曲线(a)和微量元素蛛网图(b)

标准值据Sun and McDonough (1989)

Fig. 4. Chondrite-normalized REE pattern (a) and trace element spider diagram(b) for the K-bentonites in Ningkuo Formation

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图 5 宁国组Azygograptus suecicus带和Exigraptus clavus带斑脱岩锆石的阴极发光图像及分析点位和²⁰⁶Pb-²³⁸U视年龄

图a、b分别为常山黄泥塘金钉子剖面宁国组斑脱岩HntA、江山横塘剖面宁国组斑脱岩Hnt1

Fig. 5. CL photomicrographs, meansured points and age data (²⁰⁶Pb/²³⁸U) of zircons for the K-bentonites of Azygograptus suecicus Zone and Exigraptus clavus Zone in Ningkuo Formation

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图 6 宁国组Azygograptus suecicus带和Exigraptus clavus带斑脱岩锆石U-Pb年龄谐和图

Fig. 6. SHRIMP U-Pb concordia ages of zircons for the K-bentonites of Azygograptus suecicus Zone and Exigraptus clavus Zone in Ningkuo Formation

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图 7 宁国组Azygograptus ellesae带斑脱岩锆石的阴极发光图像及分析点位和²⁰⁶Pb-²³⁸U视年龄

图a、b分别为常山黄泥塘金钉子剖面宁国组斑脱岩HntB、Hnt1

Fig. 7. CL photomicrographs, meansured points and age data (²⁰⁶Pb/²³⁸U) of zircons for the K-bentonites of Acrograptus ellesae Zone in Ningkuo Formation

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图 8 宁国组Acrograptus ellesae带斑脱岩锆石SHRIMP U-Pb年龄谐和图

Fig. 8. SHRIMP U-Pb concordia ages of zircons for the K-bentonites of Acrograptus ellesae Zone in Ningkuo Formation

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表 1 宁国组斑脱岩主量元素(%)和微量元素(10^-6)组成

Table 1. Major elements (%) and trace elements (10^-6) of the K-bentonites in Ningkuo Formation

样号	Ht1-1	Ht1-2	Hnt1-1	Hnt1-2
SiO₂	56.83	60.82	51.69	51.48
TiO₂	0.50	0.46	0.46	0.45
Al₂O₃	23.67	21.61	25.57	25.68
TFe₂O₃	2.50	2.46	3.05	3.07
MnO	0.01	0.01	0.02	0.03
MgO	1.99	1.74	2.53	2.55
CaO	0.013	0.091	0.630	0.640
Na₂O	0.04	0.04	0.08	0.08
K₂O	5.53	4.44	7.17	7.21
P₂O₅	0.03	0.03	0.12	0.10
LOI	8.68	7.92	8.68	8.78
Total	99.80	99.62	100.00	100.06
K₂O/Na₂O	125.7	120.0	94.3	96.1
Al₂O₃/ TiO₂	47.34	46.98	55.59	57.07
AR	1.62	1.52	1.76	1.77
Rb	241	276	343	330
Sr	15	16	19	18
Ba	216	253	483	481
Th	30	32	42	43
Zr	144	148	265	264
Hf	5.57	6.11	9.00	9.09
Nb	7.59	8.22	15.10	14.90
Ta	1.47	1.60	2.57	2.54
V	66.4	76.1	53.2	52.2
Cr	32.6	37.6	22.1	22.4
Co	11.00	7.47	8.87	9.27
Ni	30.2	28.2	21.2	21.4
Y	51.3	55.3	51.8	50.6
Zr /Hf	25.9	24.2	29.4	29.0
Ti/Th	99.9	86.2	65.3	62.4
La	52.1	56.6	36.0	39.5
Ce	94.7	97.4	101.4	113.2
Pr	14.4	15.6	9.3	10.2
Nd	59.03	63.20	37.82	41.61
Sm	11.85	12.66	8.07	8.62
Eu	2.14	2.32	1.14	1.21
Gd	9.77	10.98	6.88	7.25
Tb	1.42	1.52	1.22	1.22
Dy	7.47	8.45	8.49	8.35
Ho	1.46	1.64	1.82	1.83
Er	3.96	4.47	5.92	5.88
Tm	0.57	0.64	0.89	0.92
Yb	3.48	3.93	5.70	5.63
Lu	0.51	0.59	0.84	0.82
ΣREE	262.86	279.98	225.52	246.26
LREE/HREE	8.18	7.69	6.10	6.72
La_N/Yb_N	10.74	10.33	4.54	5.04
δEu	0.61	0.60	0.47	0.47

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表 2 宁国组Azygograptus suecicus带和Exigraptus clavus带斑脱岩锆石SHRIMP U-Pb年龄测定结果

Table 2. SHRIMP U-Pb data of zircons for the K-bentonites of Azygograptus suecicus and Exigraptus clavus zones in Ningkuo Formation

点号	²⁰⁶Pb_c (%)	U (10^-⁶)	Th (10^-⁶)	²³²Th/ ²³⁸U	²⁰⁶Pb* (10^-⁶)	²⁰⁶Pb/²³⁸U (Ma)	±1σ (%)	²⁰⁷Pb^/ ²⁰⁶Pb^	±1σ (%)	²⁰⁷Pb^*/ ²³⁵U	±1σ (%)	²⁰⁶Pb^*/ ²³⁸U	±1σ (%)
HntA-1.1	6.51	133	74	0.57	9.36	475	10	0.046 1	8.9	0.486 1	8.8	0.076 5	2.3
HntA-2.1	3.91	112	54	0.50	6.72	419	9.1	0.050 7	6.6	0.469 3	6.6	0.067 2	2.2
HntA-3.1	9.70	134	93	0.72	9.11	444	10	0.047 0	21	0.470 7	20	0.071 4	2.4
HntA-4.1	3.63	689	417	0.63	42.5	431	9.2	0.056 8	2.6	0.541 2	3.3	0.069 1	2.1
HntA-5.1	1.31	739	638	0.89	49.2	475	9.6	0.057 6	1.3	0.607 0	2.5	0.076 5	2.1
HntA-6.1	8.92	141	97	0.71	10.4	484	11	0.060 0	8.6	0.650 6	8.7	0.078 0	2.3
HntA-7.1	23.08	296	262	0.92	23.9	450	10	0.056 0	14	0.560 4	14	0.072 3	2.3
HntA-8.1	12.17	202	151	0.78	19.1	596	13	0.096 0	5.6	1.290 3	6.2	0.096 8	2.2
HntA-9.1	4.82	375	441	1.22	24.8	456	9.4	0.059 8	4.8	0.605 1	4.8	0.073 4	2.1
HntA-10.1	14.88	598	1020	1.76	43.9	453	9.5	0.054 0	9.9	0.540 3	9.8	0.072 8	2.2
HntA-11.1	5.55	501	298	0.61	36.1	492	10	0.062 8	3.2	0.687 4	3.9	0.079 3	2.2
HntA-12.1	14.46	727	425	0.60	52.8	450	9.3	0.070 0	8.2	0.700 6	8.1	0.072 3	2.3
HntA-13.1	13.24	235	162	0.71	18.2	485	11	0.078 5	6.1	0.850 2	6.3	0.078 1	2.3
HntA-14.1	19.43	216	167	0.80	18.2	490	11	0.090 0	11	0.980 7	11.2	0.079 1	2.4
HntA-15.1	2.01	318	179	0.58	20.5	459	9.6	0.061 0	3.6	0.620 1	4.2	0.073 8	2.2
Ht1-1.1	--	185	87	0.48	12	471	9.9	0.055 7	3.6	0.581 4	4.2	0.075 8	2.2
Ht1- 2.1	--	360	173	0.50	24.6	494	10	0.059 2	1.7	0.650 0	2.7	0.079 7	2.1
Ht1- 3.1	--	183	59	0.33	12.6	498	10	0.056 1	2.3	0.620 9	3.1	0.080 3	2.2
Ht1- 4.1	0.02	202	62	0.32	13.6	489	14	0.057 9	2.4	0.628 5	3.7	0.078 7	2.9
Ht1- 5.1	0.09	211	57	0.28	13.9	477	10	0.053 7	3.4	0.568 5	4.1	0.076 8	2.2
Ht1- 6.1	0.60	210	219	1.08	13.5	462	9.9	0.053 6	4.2	0.548 9	4.8	0.074 3	2.2
Ht1- 7.1	0.10	217	175	0.84	14.6	487	10	0.054 7	4.0	0.591 1	4.6	0.078 4	2.2
Ht1- 8.1	0.12	231	154	0.69	15.6	488	10	0.053 7	2.8	0.581 7	3.6	0.078 6	2.2
Ht1- 9.1	--	298	351	1.22	19.9	484	9.9	0.059 6	2.0	0.640 9	2.9	0.077 9	2.1
Ht1- 10.1	0.01	51	21	0.42	3.32	468	12	0.056 2	5.1	0.584 4	5.7	0.075 4	2.6
Ht1- 11.1	--	302	226	0.77	20.2	484	9.8	0.057 2	2.3	0.614 6	3.1	0.078 0	2.1
Ht1- 12.1	0.42	194	55	0.29	13	481	10	0.052 2	2.9	0.557 8	3.6	0.077 5	2.2
Ht1- 13.1	0.26	258	96	0.39	17	476	9.8	0.054 9	2.6	0.580 6	3.3	0.076 7	2.1
Ht1- 14.1	0.29	157	70	0.46	10.4	478	10	0.052 9	5.9	0.561 4	6.3	0.077 0	2.2
Ht1- 15.1	0.35	215	177	0.85	14.5	484	10	0.052 2	2.1	0.560 8	3.0	0.077 9	2.1
Ht1- 16.1	0.43	264	166	0.65	17.8	486	9.9	0.054 2	2.1	0.584 8	3.0	0.078 3	2.1
Ht1- 17.1	0.25	184	50	0.28	12.4	484	10	0.054 4	2.4	0.584 3	3.2	0.077 9	2.2
Ht1- 18.1	0.18	316	145	0.48	21.3	488	9.9	0.053 4	2.3	0.578 1	3.1	0.078 6	2.1
Ht1- 19.1	0.15	247	233	0.97	16.6	483	9.9	0.054 7	2.3	0.587 1	3.1	0.077 9	2.1
Ht1- 20.1	--	179	106	0.61	11.8	477	10	0.054 5	2.2	0.577 9	3.1	0.076 9	2.2
注：Pb_c和Pb*分别代表普通铅和放射性成因铅，标准校正值的误差为0.40%.应用实测²⁰⁴Pb校正普通铅.

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表 3 宁国组Acrograptus ellesae带斑脱岩锆石的SHRIMP U-Pb年龄测定结果

Table 3. SHRIMP U-Pb data of zircons for the K-bentonites of Acrograptus ellesae Zone in Ningkuo Formation

点号	²⁰⁶Pb_c (%)	U (10^-⁶)	Th (10^-⁶)	²³²Th/ ²³⁸U	²⁰⁶Pb* (10^-⁶)	²⁰⁶Pb/²³⁸U (Ma)	±1σ (%)	²⁰⁷Pb^/ ²⁰⁶Pb^	±1σ (%)	²⁰⁷Pb^*/ ²³⁵U	±1σ (%)	²⁰⁶Pb^*/ ²³⁸U	±1σ (%)
HntB-1.1	1.95	347	258	0.77	23.5	479	10	0.053 9	2.4	0.573 2	3.8	0.077 2	2.2
HntB-2.1	3.88	249	144	0.60	16.6	462	9.6	0.058 9	6.1	0.604 1	6.4	0.074 3	2.1
HntB-3.1	16.78	138	72	0.54	9.81	430	11	0.059 0	18	0.560 6	17	0.069 0	2.5
HntB-4.1	2.24	224	157	0.72	14.4	456	9.5	0.058 2	3.1	0.588 3	3.7	0.073 3	2.2
HntB-5.1	2.41	432	298	0.71	29.5	482	9.9	0.052 0	2.9	0.557 0	3.6	0.077 7	2.1
HntB-6.1	1.99	386	265	0.71	25.0	461	9.7	0.052 6	2.8	0.537 4	3.6	0.074 1	2.2
HntB-7.1	20.59	253	167	0.68	25.3	570	13	0.061 0	13	0.770 5	13	0.092 4	2.4
HntB-8.1	2.22	413	319	0.80	26.9	461	9.4	0.057 5	2.4	0.588 2	3.2	0.074 1	2.1
HntB-9.1	9.52	175	190	1.12	11.7	436	9.7	0.036 4	13	0.351 6	13	0.070 1	2.2
HntB-10.1	5.81	372	270	0.75	26.0	476	10	0.056 4	7.4	0.595 2	8.2	0.076 6	2.2
HntB-11.1	8.16	297	401	1.40	21.2	474	10	0.048 2	9.7	0.507 0	9.6	0.076 2	2.2
HntB-12.1	6.08	149	66	0.46	10.1	459	9.9	0.050 1	8.4	0.510 8	8.6	0.073 8	2.2
HntB-13.1	13.90	54	33	0.62	3.88	446	11	0.040 0	23	0.390 5	23	0.071 6	2.6
Hnt1-1.1	0.09	423	499	1.22	29.3	500	19	0.055 7	2.0	0.620 1	4.3	0.080 7	3.9
Hnt1-2.1	0.82	150	121	0.83	10.2	487	11	0.051 8	5.4	0.559 9	5.9	0.078 5	2.3
Hnt1-3.1	1.86	213	110	0.53	13.9	462	11	0.041 0	2.6	0.419 7	2.6	0.074 3	2.6
Hnt1-4.1	--	410	163	0.41	27.5	485	10	0.057 5	1.6	0.619 9	2.7	0.078 2	2.2
Hnt1-5.1	0.05	423	232	0.57	28.9	493	10	0.057 0	1.6	0.624 1	2.7	0.079 4	2.2
Hnt1-6.1	0.02	361	249	0.71	23.6	474	10	0.055 8	1.7	0.586 5	2.7	0.076 2	2.2
Hnt1-7.1	0.31	218	134	0.63	15.0	497	11	0.055 4	2.9	0.612 7	3.7	0.080 1	2.2
Hnt1-8.1	1.55	169	153	0.94	11.7	491	11	0.052 1	9.9	0.568 7	10	0.079 2	2.3
Hnt1-9.1	0.22	223	112	0.52	16.0	515	11	0.056 5	3.2	0.647 7	3.9	0.083 1	2.2
Hnt1-10.1	0.21	188	118	0.64	12.6	482	11	0.053 5	3.9	0.572 9	4.5	0.077 6	2.3
Hnt1-11.1	0.31	167	70	0.44	11.0	475	10	0.055 0	2.6	0.579 1	3.5	0.076 4	2.3
Hnt1-12.1	--	426	176	0.43	28.7	487	10	0.058 1	1.7	0.629 3	2.8	0.078 5	2.2
Hnt1-13.1	0.09	299	183	0.63	19.5	472	10	0.056 5	3.6	0.591 8	4.3	0.076 0	2.2
Hnt1-14.1	0.02	320	99	0.32	21.5	485	10	0.057 1	1.8	0.615 6	2.9	0.078 1	2.2
Hnt1-15.1	0.14	169	43	0.26	11.2	479	10	0.058 9	2.7	0.625 9	3.5	0.077 1	2.3
Hnt1-16.1	--	124	86	0.72	8.09	474	12	0.059 9	2.7	0.629 6	3.8	0.076 2	2.6
Hnt1-17.1	0.32	467	263	0.58	31.4	485	10	0.053 8	2.8	0.578 8	3.5	0.078 1	2.2
Hnt1-18.1	0.26	267	175	0.68	17.5	473	10	0.054 3	2.4	0.570 8	3.3	0.076 2	2.2
Hnt1-19.1	0.00	146	49	0.34	9.96	492	11	0.058 5	2.5	0.639 1	3.4	0.079 3	2.3
Hnt1-20.1	0.15	459	417	0.94	29.9	471	9.9	0.055 2	2.1	0.576 9	3.1	0.075 8	2.2
Hnt1-21.1	--	132	84	0.66	8.21	450	12	0.056 2	2.7	0.560 7	3.9	0.072 4	2.8
Hnt1-22.1	--	172	151	0.91	10.5	445	9.9	0.058 9	3.6	0.579 8	4.2	0.071 4	2.3
Hnt1-23.1	3.71	581	316	0.56	40.3	483	10	0.058 0	6.3	0.621 3	6.6	0.077 7	2.2
Hnt1-24.1	0.69	180	98	0.56	10.9	438	10	0.052 8	5.4	0.511 4	5.9	0.070 2	2.5
Hnt1-25.1	0.15	303	194	0.66	19.4	463	10	0.055 5	2.7	0.570 0	3.5	0.074 5	2.2
Hnt1-26.1	0.40	290	157	0.56	18.9	469	10	0.053 9	3.2	0.561 5	3.9	0.075 5	2.2
Hnt1-27.1	0.02	294	161	0.56	18.2	447	12	0.056 3	2.2	0.557 5	3.6	0.071 9	2.9
Hnt1-28.1	--	182	127	0.72	11.9	473	10	0.059 9	2.4	0.628 3	3.3	0.076 1	2.3
Hnt1-29.1	0.03	823	233	0.29	26.8	240	5.1	0.050 7	1.9	0.265 5	2.9	0.037 9	2.2
Hnt1-30.1	0.56	186	207	1.15	11.7	452	10	0.054 1	4.1	0.542 3	4.8	0.072 7	2.4
注：Pb_c和Pb*分别代表普通铅和放射性成因铅，标准校正值的误差为0.40%.应用实测²⁰⁴Pb校正普通铅.

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