贵州官坝地区二叠系—三叠系地质界面黏土岩的火山岩特征、LA-ICP-MS 锆石U-Pb年龄及其地质意义

doi:10.19657/j.geoscience.1000-8527.2020.042

现代地质 ›› 2020, Vol. 34 ›› Issue (05): 1028-1042.DOI: 10.19657/j.geoscience.1000-8527.2020.042

贵州官坝地区二叠系—三叠系地质界面黏土岩的火山岩特征、LA-ICP-MS 锆石U-Pb年龄及其地质意义

何碧¹(), 张向文¹, 赵飞¹, 金灿海², 任光明², 王宁祖¹, 张文斌¹, 张志玺¹, 孙平原¹

1.甘肃省地质矿产勘查开发局第二地质矿产勘查院,甘肃兰州 730020
2.中国地质调查局成都地质调查中心,四川成都 610081

收稿日期:2018-09-12 修回日期:2020-06-16 出版日期:2020-10-28 发布日期:2020-10-29
作者简介:何碧,男,硕士,工程师,1990年出生,古生物学与地层学专业,主要从事区域地质与生态环境地质工作。Email: hebidzxgsw@163.com。
基金资助:
中国地质调查局地质调查项目“乌蒙山区地质矿产综合调查”项目(DD20160019);中国地质调查局成都地质调查中心项目“贵州乌蒙山区1∶5万店子场(G48E006018)、大关(G48E007017)、六厂(G48E0070183)幅区域地质调查”(DD20160019-04)

Volcanic Characteristics, LA-ICP-MS Zircon U-Pb Ages of Claystone at the Permian-Triassic Boundary, Guanba Area in Guizhou Province, South China and the Geological Implications

HE Bi¹(), ZHANG Xiangwen¹, ZHAO Fei¹, JIN Canhai², REN Guangming², WANG Ningzu¹, ZHANG Wenbin¹, ZHANG Zhixi¹, SUN Pingyuan¹

1. The Second Institute of Geology and Minerals Exploration Team,Gansu Provincial Bureau of Geology and Minerals Exploration and Development,Lanzhou,Gansu 730020,China
2. Chengdu Center,China Geological Survey,Chengdu,Sichuan 610081,China

Received:2018-09-12 Revised:2020-06-16 Online:2020-10-28 Published:2020-10-29

摘要/Abstract

摘要：

贵州省黔西县官坝地区位于华南板块西南部,其二叠系—三叠系界线剖面出露较好,界线处出露3层黏土岩。采集贵州黔西官坝地区二叠系—三叠系地质界面黏土岩1件U-Pb年龄样品、7件地球化学样品,对其锆石进行U-Pb定年以及主量、微量和稀土元素进行测试分析。锆石 LA-ICP-MS U-Pb分析结果表明,U和Th含量分别为60.26×10 ^-6~297.9×10 ^-6和46.14×10 ^-6~244.26×10 ^-6,Th/U比值介于0.76~1.55之间,为典型的岩浆锆石;获得 ²⁰⁶Pb/ ²³⁸U加权平均年龄为(252.6±1.4) Ma,谐和年龄为(252.7±0.6) Ma。地球化学分析结果显示,黏土岩属于高硅、铝、钾、镁,低铁、钛的钙碱质中酸性火山物质,具有稀土元素总量相对较高、相对富集轻稀土元素和轻、重稀土元素分馏程度高的特征,负Eu异常明显,δEu =0.19~0.45。上述岩石地球化学特征表明,贵州黔西官坝地区(华南板块西南)二叠系—三叠系界线位置总体上可与浙江长兴(华南板块东南)海相二叠系—三叠系界线(金钉子)相比较。

关键词: 二叠系—三叠系界线;, 黏土岩, LA-ICP-MS锆石 U-Pb年龄, 官坝地区

Abstract:

Three Permian-Triassic claystone are outcropped at Guanba (Qianxi County) in Guizhou Province, geologically in the southwestern South China block. One sample for zircon U-Pb dating and 7 samples for geochemical analysis were collected from the base of the claystone. LA-ICP-MS zircon U-Pb analysis shows that the zircons have 60.26×10 ^-6-297.90×10 ^-6 U and 46.14×10 ^-6-244.26×10 ^-6 Th, with Th/U value of 0.76-1.55, resembling typical igneous zircons. Zircon U-Pb dating yielded a ²⁰⁶Pb/ ²³⁸U weighted mean age of (252.6±1.4) Ma, and the concordant age of (252.7±0.6) Ma. Geochemical analysis shows that the tuff contains calc-alkaline volcanic materials with high Si-Al-K-Mg contents and low Fe-Ti contents. Additionally, the claystone has relatively high total REE contents, with elevated LREE enrichments and REE fractionation. Negative Eu anomaly is obvious (δEu=0.19-0.45). Geochemical characteristics indicate that the Permian-Triassic boundary at Guanba is comparable to the marine-facies Permian-Triassic boundary at Changhsing (GSSP, southeastern South China block).

Key words: Permian-Triassic boundary, claystone, LA-ICP-MS zircon U-Pb dating, Guanba area, Guizhou Province

中图分类号:

何碧, 张向文, 赵飞, 金灿海, 任光明, 王宁祖, 张文斌, 张志玺, 孙平原. 贵州官坝地区二叠系—三叠系地质界面黏土岩的火山岩特征、LA-ICP-MS 锆石U-Pb年龄及其地质意义[J]. 现代地质, 2020, 34(05): 1028-1042.

HE Bi, ZHANG Xiangwen, ZHAO Fei, JIN Canhai, REN Guangming, WANG Ningzu, ZHANG Wenbin, ZHANG Zhixi, SUN Pingyuan. Volcanic Characteristics, LA-ICP-MS Zircon U-Pb Ages of Claystone at the Permian-Triassic Boundary, Guanba Area in Guizhou Province, South China and the Geological Implications[J]. Geoscience, 2020, 34(05): 1028-1042.

图/表 12

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点号	含量/10^-6			Th/U	同位素比值				同位素年龄/Ma				谐和度/%
点号	Th	U	Pb	Th/U	²⁰⁷Pb/ ²⁰⁶Pb±1σ	²⁰⁷Pb/ ²³⁵U±1σ	²⁰⁶Pb/ ²³⁸U±1σ	²⁰⁸Pb/ ²³²Th±1σ	²⁰⁷Pb/ ²⁰⁶Pb±1σ	²⁰⁷Pb/ ²³⁵U±1σ	²⁰⁶Pb/ ²³⁸U±1σ	²⁰⁸Pb/ ²³²Th±1σ	谐和度/%
01	183.92	208.31	11.06	0.88	0.050 2±0.001 4	0.275±0.008	0.039 9±0.000 3	0.012 8±0.000 2	211.2±66.7	247.0±6.0	252.4±2.1	257.7±4.2	97
02	105.42	108.33	5.98	0.97	0.054 4±0.002 0	0.305±0.011	0.040 8±0.000 5	0.012 7±0.000 3	390.8±83.3	270.4±8.4	257.5±2.8	254.1±5.5	95
03	160.09	167.54	9.03	0.96	0.049 1±0.001 5	0.277±0.009	0.040 9±0.000 4	0.012 5±0.000 2	153.8±76.8	248.2±6.8	258.2±2.4	251.5±4.5	96
04	77.68	76.66	4.24	1.01	0.052 3±0.002 5	0.291±0.013	0.041 0±0.000 5	0.012 9±0.000 3	298.2±109.2	259.3±10.3	259.2±3.3	258.2±5.8	99
06	52.05	61.13	3.13	0.85	0.054 9±0.002 7	0.290±0.012	0.039 3±0.000 5	0.012 1±0.000 3	409.3±111.1	258.6±9.8	248.6±3.2	243.8±6.6	96
07	96.26	98.42	5.13	0.98	0.055 5±0.002 4	0.294±0.012	0.039 4±0.000 4	0.012 1±0.000 3	435.2±91.7	261.8±9.3	249.3±2.8	243.2±5.6	95
08	46.14	60.26	3.06	0.77	0.055 0±0.003 2	0.297±0.016	0.040 3±0.000 6	0.012 4±0.000 4	413.0±129.6	264.0±12.4	254.6±3.7	248.5±7.9	96
09	67.88	71.53	3.82	0.95	0.054 5±0.002 6	0.292±0.013	0.039 7±0.000 5	0.012 7±0.000 3	390.8±107.4	260.5±10.2	251.1±3.3	255.3±6.6	96
10	163.71	105.59	6.45	1.55	0.054 7±0.002 5	0.295±0.013	0.040 0±0.000 5	0.012 8±0.000 2	398.2±100.9	262.8±10.0	252.6±3.0	257.7±4.8	96
11	96.17	112.87	5.90	0.85	0.051 7±0.001 8	0.280±0.009	0.040 0±0.000 4	0.012 4±0.000 3	333.4±81.5	250.8±7.4	252.6±2.5	249.5±5.2	99
14	46.66	60.61	3.14	0.77	0.053 1±0.002 6	0.283±0.013	0.039 9±0.000 5	0.012 7±0.000 3	344.5±111.1	252.7±10.0	252.4±3.3	254.7±6.9	99
15	122.44	140.11	7.24	0.87	0.054 1±0.002 0	0.289±0.010	0.039 5±0.000 4	0.012 5±0.000 3	376.0±85.2	257.9±7.7	249.5±2.7	250.7±5.3	96
16	151.28	137.83	7.65	1.10	0.053 8±0.001 8	0.294±0.010	0.040 1±0.000 4	0.012 7±0.000 2	364.9±75.9	261.8±7.5	253.3±2.5	255.0±4.6	96
17	157.34	150.48	8.18	1.05	0.054 1±0.001 8	0.290±0.009	0.039 3±0.000 4	0.012 6±0.000 2	376.0±74.1	258.5±7.4	248.4±2.4	252.4±4.1	96
18	214.65	234.32	12.52	0.92	0.053 2±0.001 4	0.292±0.007	0.039 8±0.000 3	0.013 1±0.000 2	344.5±57.4	259.8±5.9	251.7±2.0	262.8±4.0	96
19	112.41	114.06	6.05	0.99	0.052 8±0.002 2	0.280±0.011	0.040 2±0.000 5	0.012 3±0.000 3	320.4±96.3	254.7±8.7	253.9±2.9	247.6±5.5	99
21	92.95	94.93	5.12	0.98	0.052 6±0.002 0	0.280±0.010	0.039 4±0.000 4	0.013 0±0.000 2	322.3±82.4	250.6±7.9	249.4±2.5	261.8±4.8	99
22	80.47	106.22	5.45	0.76	0.053 2±0.001 9	0.289±0.010	0.039 7±0.000 4	0.013 1±0.000 3	338.9±83.3	257.4±8.0	251.2±2.5	262.3±5.3	97
24	244.26	297.90	15.63	0.82	0.050 6±0.001 2	0.280±0.007	0.040 2±0.000 3	0.012 6±0.000 2	233.4±57.4	250.6±5.4	254.3±1.8	253.7±3.7	98
25	98.44	99.04	5.44	0.99	0.050 5±0.001 8	0.276±0.009	0.040 2±0.000 4	0.012 8±0.000 2	216.7±83.3	247.8±7.5	254.2±2.8	256.1±4.9	97

点号	含量/10^-6			Th/U	同位素比值				同位素年龄/Ma				谐和度/%
点号	Th	U	Pb	Th/U	²⁰⁷Pb/ ²⁰⁶Pb±1σ	²⁰⁷Pb/ ²³⁵U±1σ	²⁰⁶Pb/ ²³⁸U±1σ	²⁰⁸Pb/ ²³²Th±1σ	²⁰⁷Pb/ ²⁰⁶Pb±1σ	²⁰⁷Pb/ ²³⁵U±1σ	²⁰⁶Pb/ ²³⁸U±1σ	²⁰⁸Pb/ ²³²Th±1σ	谐和度/%
01	183.92	208.31	11.06	0.88	0.050 2±0.001 4	0.275±0.008	0.039 9±0.000 3	0.012 8±0.000 2	211.2±66.7	247.0±6.0	252.4±2.1	257.7±4.2	97
02	105.42	108.33	5.98	0.97	0.054 4±0.002 0	0.305±0.011	0.040 8±0.000 5	0.012 7±0.000 3	390.8±83.3	270.4±8.4	257.5±2.8	254.1±5.5	95
03	160.09	167.54	9.03	0.96	0.049 1±0.001 5	0.277±0.009	0.040 9±0.000 4	0.012 5±0.000 2	153.8±76.8	248.2±6.8	258.2±2.4	251.5±4.5	96
04	77.68	76.66	4.24	1.01	0.052 3±0.002 5	0.291±0.013	0.041 0±0.000 5	0.012 9±0.000 3	298.2±109.2	259.3±10.3	259.2±3.3	258.2±5.8	99
06	52.05	61.13	3.13	0.85	0.054 9±0.002 7	0.290±0.012	0.039 3±0.000 5	0.012 1±0.000 3	409.3±111.1	258.6±9.8	248.6±3.2	243.8±6.6	96
07	96.26	98.42	5.13	0.98	0.055 5±0.002 4	0.294±0.012	0.039 4±0.000 4	0.012 1±0.000 3	435.2±91.7	261.8±9.3	249.3±2.8	243.2±5.6	95
08	46.14	60.26	3.06	0.77	0.055 0±0.003 2	0.297±0.016	0.040 3±0.000 6	0.012 4±0.000 4	413.0±129.6	264.0±12.4	254.6±3.7	248.5±7.9	96
09	67.88	71.53	3.82	0.95	0.054 5±0.002 6	0.292±0.013	0.039 7±0.000 5	0.012 7±0.000 3	390.8±107.4	260.5±10.2	251.1±3.3	255.3±6.6	96
10	163.71	105.59	6.45	1.55	0.054 7±0.002 5	0.295±0.013	0.040 0±0.000 5	0.012 8±0.000 2	398.2±100.9	262.8±10.0	252.6±3.0	257.7±4.8	96
11	96.17	112.87	5.90	0.85	0.051 7±0.001 8	0.280±0.009	0.040 0±0.000 4	0.012 4±0.000 3	333.4±81.5	250.8±7.4	252.6±2.5	249.5±5.2	99
14	46.66	60.61	3.14	0.77	0.053 1±0.002 6	0.283±0.013	0.039 9±0.000 5	0.012 7±0.000 3	344.5±111.1	252.7±10.0	252.4±3.3	254.7±6.9	99
15	122.44	140.11	7.24	0.87	0.054 1±0.002 0	0.289±0.010	0.039 5±0.000 4	0.012 5±0.000 3	376.0±85.2	257.9±7.7	249.5±2.7	250.7±5.3	96
16	151.28	137.83	7.65	1.10	0.053 8±0.001 8	0.294±0.010	0.040 1±0.000 4	0.012 7±0.000 2	364.9±75.9	261.8±7.5	253.3±2.5	255.0±4.6	96
17	157.34	150.48	8.18	1.05	0.054 1±0.001 8	0.290±0.009	0.039 3±0.000 4	0.012 6±0.000 2	376.0±74.1	258.5±7.4	248.4±2.4	252.4±4.1	96
18	214.65	234.32	12.52	0.92	0.053 2±0.001 4	0.292±0.007	0.039 8±0.000 3	0.013 1±0.000 2	344.5±57.4	259.8±5.9	251.7±2.0	262.8±4.0	96
19	112.41	114.06	6.05	0.99	0.052 8±0.002 2	0.280±0.011	0.040 2±0.000 5	0.012 3±0.000 3	320.4±96.3	254.7±8.7	253.9±2.9	247.6±5.5	99
21	92.95	94.93	5.12	0.98	0.052 6±0.002 0	0.280±0.010	0.039 4±0.000 4	0.013 0±0.000 2	322.3±82.4	250.6±7.9	249.4±2.5	261.8±4.8	99
22	80.47	106.22	5.45	0.76	0.053 2±0.001 9	0.289±0.010	0.039 7±0.000 4	0.013 1±0.000 3	338.9±83.3	257.4±8.0	251.2±2.5	262.3±5.3	97
24	244.26	297.90	15.63	0.82	0.050 6±0.001 2	0.280±0.007	0.040 2±0.000 3	0.012 6±0.000 2	233.4±57.4	250.6±5.4	254.3±1.8	253.7±3.7	98
25	98.44	99.04	5.44	0.99	0.050 5±0.001 8	0.276±0.009	0.040 2±0.000 4	0.012 8±0.000 2	216.7±83.3	247.8±7.5	254.2±2.8	256.1±4.9	97

样品编号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量	SiO₂/ Al₂O₃	TiO₂/ Al₂O₃	Al₂O₃ / TiO₂	Al₂O₃/(Al₂O₃ +TFe₂O₃)	Rb
PM315-DH5	55.78	0.27	22.85	1.03	0.09	0.009	3.06	1.03	0.55	6.68	0.096	8.52	99.97	2.44	0.012	84.63	0.75	226.0
PM315-DH6	56.65	0.28	22.74	0.94	0.09	0.010	3.02	0.59	0.51	6.72	0.066	8.32	99.94	2.49	0.012	81.21	0.77	217.8
PM315-DH7	56.12	0.26	22.88	0.90	0.13	0.008	3.02	0.74	0.85	6.65	0.071	8.30	99.93	2.45	0.011	88.00	0.77	220.5
PM315-DH9	78.45	0.27	11.12	1.03	0.40	0.006	1.15	0.25	0.27	3.16	0.039	3.78	99.93	7.05	0.024	41.19	0.59	91.2
PM315-DH10	79.89	0.27	10.18	0.74	0.45	0.012	1.15	0.37	0.33	2.92	0.085	3.56	99.96	7.85	0.027	37.70	0.65	95.4
PM315-DH11	52.11	0.43	25.65	1.36	0.40	0.008	3.08	0.32	0.48	7.07	0.091	8.96	99.96	2.03	0.017	59.65	0.72	245.7
PM315-DH13	56.12	0.45	22.64	1.96	0.40	0.031	2.45	0.56	0.42	6.24	0.100	8.56	99.93	2.48	0.020	50.31	0.61	191.7
样品编号	Ba	Th	U	Ta	Nb	Sr	Zr	Hf	Co	Ni	Ga	Pb	Cr	Sc	La	Ce	Pr	Nd
PM315-DH5	265.00	52.30	13.80	3.96	40.300	35.20	318.00	10.84	3.91	9.52	28.60	38.60	5.21	17.60	135.60	212.06	31.20	108.903
PM315-DH6	283.88	56.30	13.09	4.56	41.600	26.46	317.84	10.52	5.18	8.89	28.28	37.20	5.21	17.60	132.00	217.67	29.18	110.128
PM315-DH7	278.63	52.90	12.75	4.30	39.312	22.37	300.44	10.35	5.50	8.88	28.70	38.22	5.37	17.93	106.20	185.13	23.20	87.833
PM315-DH9	138.25	27.76	6.28	1.74	17.971	35.93	265.64	7.26	3.32	4.63	13.02	20.44	4.98	9.52	56.30	105.58	12.08	44.200
PM315-DH10	150.00	22.52	4.52	1.68	13.800	28.58	231.30	6.42	4.96	6.07	12.67	29.60	7.97	8.36	40.92	77.08	8.61	31.483
PM315-DH11	298.00	61.46	8.93	3.46	28.220	27.60	371.90	13.31	15.56	17.20	29.05	27.89	7.23	22.77	130.80	243.47	28.46	103.513
PM315-DH13	294.63	47.14	4.00	3.02	21.200	34.20	377.46	12.75	13.27	23.00	24.29	26.55	14.08	23.10	114.84	231.13	27.27	105.963
样品编号	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	ΣREE	LREE	HREE	LREE/ HREE	δEu	δCe	(La/ Yb)_N
PM315-DH5	22.60	1.420	20.20	3.82	24.23	5.41	16.70	2.78	18.60	2.57	163.00	606.09	511.78	94.31	5.43	0.20	0.77	5.23
PM315-DH6	23.70	1.320	18.16	3.34	21.60	4.73	14.28	2.51	15.79	2.27	134.60	596.68	514.00	82.68	6.22	0.19	0.82	6.00
PM315-DH7	18.90	1.147	17.11	3.49	23.05	5.30	16.47	2.71	17.26	2.46	155.25	510.26	422.41	87.85	4.81	0.19	0.87	4.41
PM315-DH9	8.11	1.059	7.23	1.32	8.20	1.87	5.76	0.96	6.36	0.94	48.60	259.97	227.33	32.64	6.96	0.41	0.95	6.35
PM315-DH10	6.33	0.946	6.46	1.28	7.99	1.73	5.10	0.85	5.32	0.77	48.50	194.87	165.37	29.50	5.61	0.45	0.96	5.52
PM315-DH11	17.50	1.835	14.04	2.25	12.11	2.56	7.57	1.27	8.12	1.14	68.58	574.64	525.58	49.06	10.71	0.35	0.93	11.55
PM315-DH13	19.90	2.600	16.05	2.68	15.05	3.20	9.11	1.41	8.60	1.21	101.93	559.01	501.70	57.31	8.75	0.43	0.98	9.58

样品编号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量	SiO₂/ Al₂O₃	TiO₂/ Al₂O₃	Al₂O₃ / TiO₂	Al₂O₃/(Al₂O₃ +TFe₂O₃)	Rb
PM315-DH5	55.78	0.27	22.85	1.03	0.09	0.009	3.06	1.03	0.55	6.68	0.096	8.52	99.97	2.44	0.012	84.63	0.75	226.0
PM315-DH6	56.65	0.28	22.74	0.94	0.09	0.010	3.02	0.59	0.51	6.72	0.066	8.32	99.94	2.49	0.012	81.21	0.77	217.8
PM315-DH7	56.12	0.26	22.88	0.90	0.13	0.008	3.02	0.74	0.85	6.65	0.071	8.30	99.93	2.45	0.011	88.00	0.77	220.5
PM315-DH9	78.45	0.27	11.12	1.03	0.40	0.006	1.15	0.25	0.27	3.16	0.039	3.78	99.93	7.05	0.024	41.19	0.59	91.2
PM315-DH10	79.89	0.27	10.18	0.74	0.45	0.012	1.15	0.37	0.33	2.92	0.085	3.56	99.96	7.85	0.027	37.70	0.65	95.4
PM315-DH11	52.11	0.43	25.65	1.36	0.40	0.008	3.08	0.32	0.48	7.07	0.091	8.96	99.96	2.03	0.017	59.65	0.72	245.7
PM315-DH13	56.12	0.45	22.64	1.96	0.40	0.031	2.45	0.56	0.42	6.24	0.100	8.56	99.93	2.48	0.020	50.31	0.61	191.7
样品编号	Ba	Th	U	Ta	Nb	Sr	Zr	Hf	Co	Ni	Ga	Pb	Cr	Sc	La	Ce	Pr	Nd
PM315-DH5	265.00	52.30	13.80	3.96	40.300	35.20	318.00	10.84	3.91	9.52	28.60	38.60	5.21	17.60	135.60	212.06	31.20	108.903
PM315-DH6	283.88	56.30	13.09	4.56	41.600	26.46	317.84	10.52	5.18	8.89	28.28	37.20	5.21	17.60	132.00	217.67	29.18	110.128
PM315-DH7	278.63	52.90	12.75	4.30	39.312	22.37	300.44	10.35	5.50	8.88	28.70	38.22	5.37	17.93	106.20	185.13	23.20	87.833
PM315-DH9	138.25	27.76	6.28	1.74	17.971	35.93	265.64	7.26	3.32	4.63	13.02	20.44	4.98	9.52	56.30	105.58	12.08	44.200
PM315-DH10	150.00	22.52	4.52	1.68	13.800	28.58	231.30	6.42	4.96	6.07	12.67	29.60	7.97	8.36	40.92	77.08	8.61	31.483
PM315-DH11	298.00	61.46	8.93	3.46	28.220	27.60	371.90	13.31	15.56	17.20	29.05	27.89	7.23	22.77	130.80	243.47	28.46	103.513
PM315-DH13	294.63	47.14	4.00	3.02	21.200	34.20	377.46	12.75	13.27	23.00	24.29	26.55	14.08	23.10	114.84	231.13	27.27	105.963
样品编号	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	ΣREE	LREE	HREE	LREE/ HREE	δEu	δCe	(La/ Yb)_N
PM315-DH5	22.60	1.420	20.20	3.82	24.23	5.41	16.70	2.78	18.60	2.57	163.00	606.09	511.78	94.31	5.43	0.20	0.77	5.23
PM315-DH6	23.70	1.320	18.16	3.34	21.60	4.73	14.28	2.51	15.79	2.27	134.60	596.68	514.00	82.68	6.22	0.19	0.82	6.00
PM315-DH7	18.90	1.147	17.11	3.49	23.05	5.30	16.47	2.71	17.26	2.46	155.25	510.26	422.41	87.85	4.81	0.19	0.87	4.41
PM315-DH9	8.11	1.059	7.23	1.32	8.20	1.87	5.76	0.96	6.36	0.94	48.60	259.97	227.33	32.64	6.96	0.41	0.95	6.35
PM315-DH10	6.33	0.946	6.46	1.28	7.99	1.73	5.10	0.85	5.32	0.77	48.50	194.87	165.37	29.50	5.61	0.45	0.96	5.52
PM315-DH11	17.50	1.835	14.04	2.25	12.11	2.56	7.57	1.27	8.12	1.14	68.58	574.64	525.58	49.06	10.71	0.35	0.93	11.55
PM315-DH13	19.90	2.600	16.05	2.68	15.05	3.20	9.11	1.41	8.60	1.21	101.93	559.01	501.70	57.31	8.75	0.43	0.98	9.58

贵州官坝地区二叠系—三叠系地质界面黏土岩的火山岩特征、LA-ICP-MS 锆石U-Pb年龄及其地质意义

Volcanic Characteristics, LA-ICP-MS Zircon U-Pb Ages of Claystone at the Permian-Triassic Boundary, Guanba Area in Guizhou Province, South China and the Geological Implications

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