桐柏造山带中龟山杂岩的白云母<sup>40</sup>Ar/<sup>39</sup>Ar年龄及其地质意义

曲玮; 刘晓春; 崔建军; 胡娟; 李淼

doi:10.3799/dqkx.2018.015

桐柏造山带中龟山杂岩的白云母⁴⁰Ar/³⁹Ar年龄及其地质意义

doi: 10.3799/dqkx.2018.015

中国地质科学院地质力学研究所, 北京 100081

基金项目:

国家自然科学基金项目 41472064

国家重大基础研究发展规划项目 2015CB856104

详细信息

作者简介:
曲玮(1962-), 女, 高级工程师, 主要从事岩石组构和岩石地球化学研究

中图分类号: P597
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出版历程
- 收稿日期: 2017-09-03
- 刊出日期: 2018-01-15

⁴⁰Ar/³⁹Ar Dating of Muscovite from the Guishan Complex in the Tongbai Orogen, Central China, and Its Geological Implications

Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

摘要

摘要: 出露于桐柏造山带松扒-龟梅断裂带南侧的龟山杂岩经历了两阶段变质及多期变形作用，但其变质变形时代及其与秦岭造山带中产于相同构造部位的武关杂岩的构造关系尚缺乏深入研究.为此，对取自于龟山杂岩中的4件变质沉积岩和2件变质火山岩样品中的白云母进行了⁴⁰Ar/³⁹Ar同位素定年.结果表明，白云母的⁴⁰Ar/³⁹Ar坪年龄从306.7±1.7 Ma（保存最好的白云母斑晶）延续到279.2±2.6 Ma（经历后期变形改造的白云母）.结合前期锆石U-Pb定年结果推测龟山杂岩的两阶段变质及主期逆冲推覆变形均发生在石炭纪，并在二叠纪遭受到左行走滑剪切作用的改造.龟山杂岩与武关杂岩具有类似的岩石组成和变质变形演化历史，二者共同构成一条>500 km的晚古生代中级变质带，是华北-华南陆块最终碰撞之前大洋俯冲-增生的产物.
- 桐柏造山带 /
- 龟山杂岩 /
- ⁴⁰Ar/³⁹Ar定年 /
- 晚古生代 /
- 岩石学
Abstract: The Guishan complex exposed to the south of the Songpa-Guimei fault in the Tongbai orogen underwent two-stage metamorphism and multiple deformation. However, the timing of metamorphism and deformation of the complex and its relation to the Wuguan complex occurring in the same tectonic position in the Qinling orogen remain poorly constrained. In this paper, 4 metasedimentary rocks and 2 metavolcanic rocks from the Guishan complex were performed for muscovite ⁴⁰Ar/³⁹Ar dating. The results suggest that the plateau ages of muscovite range from 306.7±1.7 Ma (well-preserved muscovite porphyroblasts) to 279.2±2.6 Ma (muscovites overprinted by late deformation). Coupled with published U-Pb zircon data, it is infered that two-stage metamorphism and main thrust deformation of the Guishan complex took place during the Carboniferous, and the reworking of sinistral slid-slip shearing occurred in the Permian. The Guishan and Wuguan complexes have similar rock associations and share the same metamorphic and deformational history. The two complexes constitute a >500 km-long Late Paleozoic medium-grade metamorphic belt, which was resulted from the oceanic subduction-accretion prior to the final collision between the North and South China blocks.
- Tongbai orogen /
- Guishan complex /
- ⁴⁰Ar/³⁹Ar dating /
- Late Paleozoic /
- petrology

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图 1 桐柏造山带地质简图及研究样品的位置

Fig. 1. Geological sketch of the Tongbai orogen with the locations of the studied samples

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图 2 龟山杂岩中定年样品的野外和显微照片

Bt.黑云母；Cal.方解石；Grt.石榴石；Kfs.钾长石；Ms.白云母；Oq.不透明矿物；Pl.斜长石；Qtz.石英；Ser.绢云母；St.十字石；Tur.电气石

Fig. 2. Photographs and photomicrographs of the dated samples from the Guishan complex

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图 3 龟山杂岩中白云母的⁴⁰Ar/³⁹Ar坪年龄

Fig. 3. ⁴⁰Ar/³⁹Ar plateau ages of muscovites from the Guishan complex

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表 1 龟山杂岩中定年样品的位置、岩性、矿物组合和定年结果

Table 1. Sampling locations, lithologies, mineral assemblages and age results of the dated samples from the Guishan complex

样品	位置	经纬度	岩性	矿物组合	年龄(Ma)
变质沉积岩
YJZ06-8	老河堰	32°28′29″N 113°16′52″E	含石榴白云石英片岩	Grt+Ms+Pl+Qtz+Tur +Oq	306.7±1.7
LW01-6	老湾	32°27′50″N 113°19′30″E	白云石英片岩	Ms+Pl+Qtz+Cal+Tur+Oq	279.2±2.6
XY30-10	震雷山	32°04′51″N 114°07′17″E	含石榴十字白云石英片岩	Grt+St+Ms+Bt+Qtz+Tur+Oq	286.5±1.7
XY32-1	双桥	32°03′30″N 114°08′17″E	含石榴绢云片岩	Grt+Ms+Ser+Qtz+Tur+Oq	297.7±1.6
变质火山岩
XY13-6	十三里桥	32°04′32″N 114°02′54″E	白云钾长浅粒岩	Ms+Kfs+Qtz+Oq	292.9±1.7
XY22-6	大石门	32°04′04″N 114°04′46″E	白云钾长浅粒岩	Ms+Kfs+Qtz+Oq	280.6±1.6
注：Bt.黑云母；Cal.方解石；Grt.石榴石；Kfs.钾长石；Ms.白云母；Oq.不透明矿物；Pl.斜长石；Qtz.石英；Ser.绢云母；St.十字石；Tur.电气石.

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表 2 龟山杂岩中白云母的⁴⁰Ar/³⁹Ar同位素分析及年

Table 2. ⁴⁰Ar/³⁹Ar isotopic analyses of muscovites from the Guishan complex

加热阶段	T (℃)	⁴⁰Ar/³⁹Ar m	³⁶Ar/³⁹Ar m	³⁷Ar/³⁹Ar m	³⁸Ar/³⁹Ar m	⁴⁰Ar (%)	F	³⁹Ar (10^-14 mol)	³⁹Ar (cum.) (%)	年龄 (Ma)	±2σ
YJZ06-8(样品重量W=28.88 mg，照射参数J=0.007 789)
1	700	44.0566	0.080 2	0.000 0	0.027 6	46.21	20.358 4	0.17	0.35	265.5	7.3
2	800	34.0635	0.036 0	0.016 4	0.019 3	68.79	23.433 5	0.98	2.35	302.4	3.1
3	840	24.9599	0.005 2	0.032 1	0.013 6	93.84	23.422 6	1.47	5.34	302.3	2.9
4	880	24.4288	0.001 6	0.000 0	0.012 6	98.07	23.957 4	4.26	14.01	308.7	2.9
5	920	24.1891	0.000 3	0.0000	0.012 4	99.63	24.099 2	14.34	43.23	310.3	2.9
6	950	23.9250	0.000 2	0.000 0	0.012 3	99.79	23.8738	6.15	55.76	307.7	2.8
7	990	23.7561	0.000 3	0.004 6	0.012 3	99.55	23.648 7	4.81	65.56	305.0	2.8
8	1030	23.7545	0.000 7	0.000 0	0.012 4	99.11	23.544 0	2.72	71.09	303.8	2.8
9	1070	23.9970	0.000 6	0.000 0	0.012 5	99.21	23.807 8	2.81	76.81	306.9	2.8
10	1100	24.1220	0.000 7	0.012 9	0.012 4	99.10	23.904 1	2.92	82.75	308.0	2.8
11	1150	24.0357	0.000 2	0.006 1	0.012 3	99.72	23.968 1	5.86	94.69	308.8	2.8
12	1200	23.9635	0.000 3	0.000 0	0.012 1	99.65	23.878 8	2.46	99.70	307.7	2.8
13	1300	25.1150	0.002 7	0.041 5	0.014 8	96.82	24.316 8	0.12	99.94	312.9	7.0
14	1400	32.5910	0.025 7	0.000 0	0.012 5	76.69	24.992 8	0.03	100.00	321.0	23.0
LW01-6(样品重量W=46.75 mg，照射参数J=0.009 837)
1	600	26.895 6	0.075 1	0.000 0	0.028 8	17.45	4.693 4	0.05	0.06	81.0	46.0
2	700	7.536 1	0.016 3	0.000 0	0.018 1	36.20	2.728 4	0.31	0.44	47.8	2.8
3	800	12.520 6	0.005 8	0.002 3	0.013 5	86.24	10.797 4	2.96	4.13	182.1	1.8
4	880	17.512 4	0.005 4	0.000 6	0.012 8	90.84	15.907 6	14.19	21.81	262.3	2.4
5	910	16.648 2	0.001 3	0.000 0	0.011 9	97.65	16.256 4	16.46	42.31	267.6	2.5
6	940	15.774 7	0.001 7	0.007 5	0.012 2	96.84	15.276 4	5.56	49.22	252.6	2.4
7	970	16.141 8	0.002 4	0.004 5	0.012 5	95.53	15.419 9	3.36	53.41	254.8	2.4
8	1000	16.811 8	0.002 2	0.009 5	0.012 2	96.15	16.165 4	3.89	58.26	266.2	2.5
9	1040	17.349 9	0.002 1	0.000 5	0.012 0	96.39	16.723 7	6.59	66.46	274.8	2.6
10	1080	17.709 6	0.002 4	0.011 0	0.012 1	96.05	17.011 1	10.28	79.26	279.1	2.6
11	1120	17.400 3	0.001 0	0.001 7	0.011 7	98.34	17.111 1	13.80	96.45	280.6	2.6
12	1200	17.593 5	0.001 4	0.000 0	0.011 6	97.64	17.178 6	2.70	99.81	281.7	2.7
13	1300	21.499 6	0.013 9	0.000 0	0.013 8	80.83	17.378 3	0.15	100.00	284.7	8.0
XY30-10(样品重量W=28.10 mg，照射参数J=0.008 578)
1	700	21.733 6	0.024 8	0.000 0	0.019 4	66.22	14.392 7	0.23	0.44	210.0	5.3
2	800	22.253 8	0.009 3	0.006 5	0.014 5	87.58	19.491 0	1.31	2.90	278.9	2.6
3	840	20.664 7	0.002 4	0.018 9	0.013 2	96.50	19.942 7	1.98	6.61	284.9	2.7
4	880	20.380 1	0.001 6	0.000 6	0.012 7	97.72	19.916 4	3.01	12.24	284.5	2.7
5	920	20.554 6	0.001 3	0.017 6	0.012 6	98.14	20.172 8	8.35	27.87	287.9	2.7
6	960	20.326 3	0.000 6	0.002 8	0.012 5	99.09	20.141 9	10.23	47.02	287.5	2.7
7	1000	20.214 6	0.000 9	0.003 1	0.012 6	98.63	19.937 7	4.75	55.92	284.8	2.6
8	1040	20.325 1	0.001 5	0.024 9	0.012 7	97.74	19.865 4	3.17	61.86	283.9	2.6
9	1080	20.433 3	0.001 4	0.022 6	0.012 7	97.90	20.004 4	3.03	67.53	285.7	2.7
10	1120	20.453 7	0.001 1	0.030 1	0.012 7	98.33	20.113 2	3.19	73.49	287.1	2.7
11	1160	20.452 1	0.000 8	0.001 9	0.012 6	98.86	20.219 1	5.43	83.66	288.5	2.7
12	1200	20.490 7	0.000 4	0.002 6	0.012 5	99.44	20.375 1	6.43	95.70	290.6	2.7
13	1300	20.711 2	0.000 6	0.007 2	0.012 4	99.19	20.542 7	1.93	99.31	292.8	2.7
14	1400	21.316 2	0.002 0	0.000 0	0.011 9	97.16	20.711 1	0.37	100.00	295.0	3.7
XY32-1(样品重量W=26.85 mg，照射参数J=0.009 058)
1	700	20.792 2	0.015 1	0.000 0	0.017 1	78.52	16.326 6	0.52	0.99	248.8	2.6
2	800	22.291 1	0.008 0	0.000 7	0.014 3	89.40	19.929 1	2.08	4.98	299.4	2.8
3	840	20.803 4	0.002 8	0.001 0	0.012 9	96.00	19.970 5	3.00	10.77	300.0	2.8
4	880	20.267 6	0.001 5	0.015 4	0.012 5	97.79	19.820 5	4.48	19.41	297.9	2.8
5	910	19.974 4	0.000 7	0.000 0	0.012 4	98.89	19.753 3	6.32	31.58	296.9	2.7
6	950	19.910 5	0.000 4	0.003 2	0.012 4	99.31	19.773 1	8.83	48.57	297.2	2.7
7	980	19.873 5	0.000 6	0.001 7	0.012 4	99.07	19.689 5	4.13	56.53	296.1	2.7
8	1020	19.915 4	0.001 1	0.003 9	0.012 6	98.32	19.580 4	3.11	62.52	294.5	2.7
9	1060	20.016 9	0.001 1	0.000 9	0.012 5	98.41	19.699 4	3.20	68.68	296.2	2.7
10	1100	20.086 2	0.001 0	0.005 6	0.012 4	98.53	19.791 0	3.53	75.47	297.5	2.8
11	1140	20.078 5	0.000 9	0.009 2	0.012 5	98.72	19.821 9	5.02	85.14	297.9	2.8
12	1180	19.972 2	0.000 4	0.003 7	0.012 5	99.46	19.863 8	6.14	96.97	298.5	2.8
13	1300	20.150 3	0.000 3	0.000 0	0.012 3	99.51	20.051 8	1.32	99.52	301.1	2.9
14	1400	21.582 6	0.005 9	0.000 0	0.014 4	91.88	19.829 7	0.25	100.00	298.0	3.6
XY13-6(样品重量W=28.03 mg，照射参数J=0.008 219)
1	700	24.919 7	0.025 1	0.000 0	0.020 9	70.23	17.500 0	0.23	0.39	242.4	3.9
2	800	25.137 0	0.011 9	0.025 9	0.015 1	85.95	21.605 1	0.91	1.90	294.9	2.8
3	850	22.690 5	0.003 8	0.000 0	0.013 1	95.03	21.562 2	2.75	6.48	294.3	2.7
4	890	22.268 5	0.002 6	0.000 0	0.012 8	96.51	21.490 2	4.91	14.64	293.4	2.7
5	920	21.869 4	0.001 5	0.014 2	0.012 7	97.95	21.421 9	8.59	28.92	292.6	2.7
6	960	21.684 4	0.001 0	0.003 4	0.012 6	98.57	21.373 5	12.31	49.37	292.0	2.7
7	1000	21.719 8	0.001 3	0.001 0	0.012 6	98.21	21.330 1	10.56	66.93	291.4	2.7
8	1040	21.937 6	0.001 9	0.005 1	0.012 7	97.41	21.369 0	7.16	78.83	291.9	2.7
9	1080	21.857 9	0.001 5	0.000 0	0.012 7	97.93	21.405 4	6.13	89.03	292.4	2.7
10	1120	21.684 6	0.000 6	0.005 4	0.012 4	99.17	21.504 9	4.24	96.08	293.6	2.7
11	1160	21.653 2	0.000 4	0.000 0	0.012 4	99.43	21.530 8	1.71	98.93	293.9	2.7
12	1240	22.097 7	0.002 7	0.000 0	0.012 8	96.39	21.300 7	0.44	99.65	291.0	3.1
13	1400	23.892 4	0.004 4	0.000 0	0.013 3	94.58	22.597 1	0.21	100.00	307.3	3.8
XY22-6(样品重量W=26.38 mg，照射参数J=0.008 578)
1	700	19.206 0	0.026 8	0.120 8	0.037 5	58.78	11.289 5	0.32	0.57	166.8	2.6
2	800	22.135 7	0.009 7	0.012 0	0.029 1	87.04	19.266 6	1.07	2.49	275.9	2.6
3	840	20.440 1	0.002 5	0.000 0	0.012 7	96.38	19.700 8	1.46	5.13	281.7	2.6
4	880	19.999 3	0.001 5	0.015 3	0.012 5	97.71	19.542 0	2.12	8.95	279.6	2.6
5	920	20.246 7	0.001 5	0.000 0	0.012 7	97.82	19.805 5	5.93	19.63	283.1	2.6
6	960	19.953 9	0.000 7	0.001 8	0.012 5	98.93	19.739 5	13.56	44.07	282.2	2.6
7	990	19.737 0	0.000 6	0.008 5	0.012 5	99.08	19.555 1	6.94	56.56	279.8	2.6
8	1030	19.849 3	0.001 2	0.002 8	0.012 7	98.25	19.501 5	5.52	66.51	279.0	2.6
9	1070	19.894 0	0.001 4	0.011 5	0.012 7	97.89	19.473 8	4.52	74.66	278.7	2.6
10	1130	19.837 9	0.000 6	0.007 7	0.012 5	99.12	19.663 5	9.67	92.08	281.2	2.6
11	1180	20.017 5	0.000 4	0.012 0	0.012 5	99.45	19.908 5	4.19	99.63	284.4	2.6
12	1300	21.108 0	0.002 3	0.000 0	0.012 9	96.73	20.417 9	0.18	99.94	291.2	4.4
13	1400	27.964 4	0.013 1	0.000 0	0.018 3	86.16	24.093 9	0.03	100.00	339.0	19.0
注：m代表样品中测定的同位素比值；F为⁴⁰Ar^*/³⁹Ar比值，即放射性成因⁴⁰Ar与³⁹Ar比值；³⁹Ar(cum.)代表³⁹Ar累积.

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