湘鄂西地区晚埃迪卡拉世-早寒武世硅质岩成因及其页岩气地质意义

危凯; 陈孝红; 王传尚; 刘安; 曾雄伟; 李志宏

doi:10.19509/j.cnki.dzkq.2020.0203

湘鄂西地区晚埃迪卡拉世-早寒武世硅质岩成因及其页岩气地质意义

doi: 10.19509/j.cnki.dzkq.2020.0203

危凯^{1, 2,},
陈孝红^{1, 2},
王传尚^{1, 2},
刘安¹,
曾雄伟^{1, 2},
李志宏¹

基金项目:

国家科技重大专项 2016ZX05034001-002

中国地质调查局地质调查项目 DD20160179;DD20190823

详细信息

作者简介:
危凯(1983—)，男，高级工程师，主要从事沉积地球化学研究工作。E-mail:kaiwei1983@163.com

中图分类号: P581
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出版历程
- 收稿日期: 2019-09-04

Origin of siliceous rocks in west Hunan and Hubei Provinces during Late Ediacaran-Early Cambrian, and its geological significance of shale gas

Wei Kai^{1, 2
,},
Chen Xiaohong^{1, 2},
Wang Chuanshang^{1, 2},
Liu An¹,
Zeng Xiongwei^{1, 2},
Li Zhihong¹

摘要

摘要: 湖北宜昌地区在寒武系水井沱组取得页岩气重大突破后，中扬子地区下寒武统富有机质页岩受到了更加广泛的关注。为了查明这套富有机质页岩的成因及其与下伏硅质岩之间的内在联系，系统采集了鄂西宜昌地区鄂宜地2井岩家河组和湘西桃源、张家界地区留茶坡组-牛蹄塘组的硅质岩，利用主量元素和稀土元素数据分析了硅质岩成因，并探讨了不同地区、不同沉积模式及其对下寒武统富有机质页岩形成的意义。结果表明：①鄂宜地2井岩家河组硅质岩的Al/(Al+Fe+Mn)值介于0.30~0.68，在Al-Fe-Mn三角判别图和Fe/Ti-Al/(Al+Fe+Mn)图解上集中分布在沉积成因区；稀土元素Eu异常不明显，配分曲线为平坦模式，且(La/Yb)_N介于1.01~1.81，指示岩家河组硅质岩为沉积成因。②湘西桃源和张家界地区的硅质岩明显分为两种成因。留茶坡组硅质岩Al/(Al+Fe+Mn)值介于0.03~0.19，在Al-Fe-Mn三角图上靠近Fe一端，稀土元素表现明显的Eu正异常，且配分曲线以重稀土元素相对富集的左倾斜为主，指示明显的热液成因；牛蹄塘组硅质岩则表现相反，指示沉积成因。③埃迪卡拉纪末期，湘西斜坡地区靠近热液喷流中心，因此留茶坡组硅质岩以热液成因为主，而宜昌地区位于局限台地附近，富硅热液因受到阻隔而无法进入，因此硅质岩为沉积成因；至寒武纪早期，随着气候变暖、海平面上升，湘西和鄂西地区海水连通，因此该时期硅质岩均为沉积成因。埃迪卡拉纪末期的热液活动为海洋生物的繁盛提供了大量的磷等无机营养元素，对下寒武统水井沱组/牛蹄塘组富有机质页岩的形成具有重要的意义。沉积成因的硅质页岩相很可能是页岩气的有利相带，这或许能为页岩气勘探提供一个新的思路。
- 湘鄂西 /
- 晚埃迪卡拉世 /
- 早寒武世 /
- 硅质岩成因 /
- 富有机质页岩
Abstract: Followed by the major breakthrough of shale gas in Shuijingtuo Famation of Yichang, Hubei Province, the organic-rich shale in Lower Cambrian has received much wider attention. In order to find out the internal relationship of the organic-rich shale and the underlying siliceous rocks, we have made a systematic study of the west Hubei and Hunan Provinces, including Yanjiahe Formation of YIDI-2 Well, Liuchapo-Niutitang Formation of Taoyuan and Zhangjiajie area. Based on the analysis of major elements and rare earth elements, we discuss in the paper the different origins of siliceous rocks during Late Ediacaran-Early Cambrian, as well as their significance of shale gas. The conclusions are reached: ①The Al/(Al+Fe+Mn) values of YIDI-2 Well are between 0.30-0.68, close to the biogenic origin. In the Al-Fe-Mn and Fe/Ti-Al/(Al+Fe+Mn)decision diagrams, the sample points are also in the non-hydrothermal area. There is no obvious Eu anomaly but flat partition curves in REE, with La_N/Yb_N values between 1.01-1.81, indicating the lack of hydrothermal activities and the origin of continental margin. Therefore, the siliceous rocks in Yanjiahe Formation of YIDI-2 Well are mainly of nonhydrothermal origin. ② In the Taoyuan and Zhangjiajie area of West Hunan Province, Al/(Al+Fe+Mn) values of Liuchapo Formation are between 0.03-0.19, and the sample points are close to the Fe in the Al-Fe-Mn diagram. Combined with the obvious Eu anomalies and left-inclined partition curves in REE, it is concluded that the siliceous rocks in Liuchapo Formation are hydrothermal origin. However, it has changed into non-hydrothermal origin for the siliceous rocks in Niutitang Formation, which can be inferred by the larger values of Al/(Al+Fe+Mn) (0.29-0.70), the unconspicuous Eu anomalies and flat partition curves of REE. ③During the later period of Ediacara, due to the short distance to the hydrothermal vents, a set of hydrothermal-origin cherts are developed on the west Hunan slope. As for the Yichang area in the restricted basin, because of the blocking of silceous hydrothermal fluid, a set of dolostone is deposited. During the Early Cambrian, followed by the climate warming, sea-level rising and the sea water being connected, a set of biogenic chert is developed both in west Hunan slope and Yichang area. We conclude that the hydrothermal activities that occurred during Late Ediacaran should be of great significance for the generation of organic shales in Shuijingtuo or Niutitang Formations, because of the large supply of nutrient elements, such as phosphorus, for the flourishing of marine organism. Combined with the exploration results of Cambrian shale gas in South China, we consider that the nonhydrothermal siliceous shales are probably the favorable zones, and about to be the main direction of future exploration after more similar discoveries.
- west Hunan and Hubei /
- Late Ediacaran /
- Early Cambrian /
- origin of siliceous rock /
- organic-rich shale

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图 1 研究区采样位置图(岩相古地理图据文献[19]修改)

Figure 1. The study area and sampling locations

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图 2 湘鄂西岩家河组和留茶坡组地层对比图(碳同位素曲线据文献[8]修改)

Figure 2. Correlation of Yanjiahe Formation and Liuchapo Formation in west Hunan and Hubei Provinces

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图 3 鄂宜地2井岩家河组硅质岩样品的Al-Fe-Mn图解(a)和Fe/Ti-Al/(Al+Fe+Mn)图解(b)(底图据文献[25, 27]修改)

Figure 3. Al-Fe-Mn(a) and Fe/Ti-Al/(Al+Fe+Mn) (b) diagrams for siliceous rocks in Yanjiahe Formation, YIDI-2 Well

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图 4 鄂宜地2井岩家河组硅质岩样品的REE北美页岩标准化配分模式

Figure 4. NASC-normalized REE patterns for siliceous rocks in Yanjiahe Formation, YIDI-2 Well

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图 5 湖南湘西留茶坡组-牛蹄塘组硅质岩Al-Fe-Mn三角图

YXY.桃源叶溪堉；LGG.桃源理公港；TP.张家界田坪；Z₂l.埃迪卡拉系留茶坡组；∈₁n.寒武系牛蹄塘组

Figure 5. Al-Fe-Mn diagram for siliceous rocks of Liuchapo-Niutitang Formation in west Hunan Province

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图 6 湖南桃源和张家界地区留茶坡组-牛蹄塘组硅质岩REE北美页岩标准化配分曲线图

A.桃源叶溪堉剖面；B.张家界田坪剖面；C1.桃源理公港剖面留茶坡组顶部-牛蹄塘组；C2.桃源理公港剖面留茶坡组

Figure 6. NASC-normalized REE patterns for siliceous rocks of Liuchapo-Niutitang Formation in Taoyuan and Zhangjiajie area, west Hunan Province

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图 7 湘鄂西地区埃迪卡拉纪-寒武纪转折期硅质岩和黑色页岩沉积模式

Figure 7. Deposition model of siliceous rocks and black shales in west Hunan and Hubei Provinces during the transition period of Ediacara-Cambrian

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表 1 鄂宜地2井岩家河组下段硅质岩主量元素分析结果

Table 1. Major element contents in siliceous rocks of Yanjiahe Formation, YIDI-2 Well

样号	井深/m	SiO₂	Al₂O₃	Fe₂O₃	FeO	CaO	MgO	K₂O	Na₂O	TiO₂	P₂O₅	MnO	灼失	Al/(Al+Fe+Mn)
样号	井深/m	w_B/%												Al/(Al+Fe+Mn)
847	1 776.0	62.00	11.99	4.80	1.33	0.984	2.46	5.86	0.206	0.636	0.226	0.014	8.86	0.58
848	1 776.7	62.84	11.31	3.62	1.52	2.60	2.27	5.27	0.217	0.614	1.520	0.013	7.60	0.61
849	1 777.7	74.50	7.81	2.59	2.12	0.713	1.57	3.70	0.165	0.403	0.111	0.020	5.83	0.53
851	1 778.6	73.59	8.54	2.72	1.64	0.946	1.57	3.87	0.169	0.501	0.365	0.018	5.54	0.58
853	1 779.1	63.45	9.44	3.37	1.77	5.14	1.81	4.15	0.203	0.521	3.430	0.014	6.03	0.56
855	1 779.9	91.80	1.62	0.713	1.77	0.326	0.308	0.59	0.125	0.084	0.050	0.027	2.22	0.30
856	1 780.6	63.73	9.97	2.68	1.54	5.33	1.60	4.58	0.212	0.616	3.820	0.010	5.46	0.62
858	1 781.1	64.09	12.66	3.25	1.72	1.45	2.03	5.82	0.203	0.734	1.020	0.015	6.45	0.64
860	1 781.8	60.87	15.24	3.24	2.02	0.522	2.64	6.70	0.224	0.895	0.313	0.013	6.65	0.67
862	1 782.4	59.50	6.33	1.87	1.46	7.78	5.71	2.94	0.139	0.321	0.446	0.021	13.13	0.57
864	1 783.0	84.84	5.32	1.03	1.67	0.657	0.60	2.93	0.138	0.380	0.434	0.020	1.67	0.57
866	1 783.5	88.25	3.50	0.801	3.01	0.364	0.55	1.82	0.128	0.278	0.054	0.036	0.723	0.38
868	1 784.6	83.98	5.89	1.20	1.73	0.365	0.765	3.23	0.133	0.418	0.171	0.019	1.75	0.58
870	1 785.5	69.49	9.23	2.16	1.70	2.80	2.70	4.51	0.163	0.619	0.499	0.016	5.74	0.62
872	1 786.5	73.14	10.56	2.03	1.44	0.626	1.67	5.52	0.181	0.911	0.213	0.013	3.33	0.68
874	1 787.5	65.30	7.48	1.72	1.44	5.23	4.54	3.72	0.146	0.506	0.090	0.020	9.50	0.62
876	1 788.5	63.36	2.82	1.32	2.69	8.78	5.73	1.45	0.114	0.225	0.150	0.037	12.90	0.32
881	1 791.9	71.38	3.59	0.939	1.73	5.96	4.25	1.69	0.108	0.293	0.082	0.056	9.62	0.47
883	1 792.8	82.46	4.78	1.30	2.03	1.33	1.43	2.40	0.144	0.384	0.084	0.030	3.29	0.49
887	1 795.75	70.46	10.29	1.52	1.88	1.99	2.35	5.32	0.154	0.749	0.137	0.017	4.75	0.67

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表 2 鄂宜地2井岩家河组下段硅质岩稀土元素分析结果

Table 2. Rare earth element contents in siliceous rocks of Yanjiahe Formation, YIDI-2 Well

样号	井/m	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	ΣREE	(La/Yb)_N	δEu	δCe
样号	井/m	w_B/10^-6																(La/Yb)_N	δEu	δCe
847	1 776.0	24.40	36.20	4.93	19.20	3.58	0.76	3.32	0.55	3.41	0.74	2.11	0.34	2.13	0.30	22.20	102.0	1.08	1.03	0.78
848	1 776.7	42.50	63.20	9.52	37.50	6.90	1.46	6.44	1.04	5.98	1.22	3.18	0.45	2.66	0.35	41.80	182.4	1.51	1.03	0.74
849	1 777.7	16.20	23.10	2.97	11.30	2.08	0.44	1.91	0.31	1.89	0.40	1.19	0.19	1.26	0.18	11.50	63.4	1.21	1.04	0.78
851	1 778.6	20.00	30.30	4.24	16.50	3.14	0.68	2.76	0.45	2.66	0.53	1.48	0.23	1.41	0.19	16.00	84.6	1.34	1.08	0.78
853	1 779.1	36.60	51.70	7.71	30.00	5.28	1.12	5.06	0.79	4.58	0.92	2.43	0.34	1.97	0.26	32.10	148.8	1.75	1.02	0.73
855	1 779.9	2.42	3.34	0.39	1.49	0.28	0.11	0.24	0.04	0.26	0.06	0.18	0.03	0.22	0.03	1.76	9.1	1.04	1.99	0.80
856	1 780.6	52.80	72.00	10.70	41.60	7.70	1.76	7.13	1.17	6.94	1.40	3.62	0.48	2.78	0.36	47.00	210.4	1.79	1.11	0.71
858	1 781.1	27.60	37.70	5.05	18.90	3.28	0.73	3.07	0.49	3.01	0.65	1.89	0.30	2.06	0.28	21.30	105.0	1.26	1.08	0.75
860	1 781.8	25.50	36.90	4.47	16.70	2.98	0.61	2.60	0.40	2.50	0.56	1.71	0.30	2.07	0.30	16.70	97.6	1.16	1.03	0.81
862	1 782.4	18.60	30.60	4.63	18.50	3.41	0.78	3.09	0.49	2.70	0.53	1.33	0.18	1.17	0.15	16.40	86.2	1.50	1.13	0.78
864	1 783.0	19.00	37.80	5.38	22.20	4.24	0.95	3.71	0.56	3.00	0.56	1.38	0.18	1.12	0.15	15.50	100.2	1.60	1.12	0.89
866	1 783.5	8.34	14.70	1.71	6.40	1.15	0.33	1.02	0.16	0.90	0.19	0.56	0.09	0.59	0.09	5.04	36.2	1.33	1.43	0.92
868	1 784.6	15.50	27.20	3.56	13.70	2.54	0.54	2.19	0.33	1.75	0.36	0.95	0.14	0.91	0.12	9.82	69.8	1.61	1.07	0.87
870	1 785.5	36.60	64.10	9.44	40.00	8.03	1.74	6.77	1.05	5.38	0.99	2.43	0.33	1.99	0.26	28.50	179.1	1.73	1.11	0.82
872	1 786.5	35.70	61.00	7.38	28.20	4.91	0.99	4.40	0.68	3.88	0.80	2.25	0.34	2.18	0.30	22.00	153.0	1.54	1.00	0.89
874	1 787.5	24.60	36.00	4.56	16.50	2.72	0.59	2.47	0.38	2.24	0.46	1.29	0.20	1.28	0.18	12.70	93.5	1.81	1.07	0.80
876	1 788.5	15.60	24.40	3.54	14.40	2.55	0.55	2.23	0.34	1.87	0.36	0.96	0.13	0.82	0.11	10.20	67.9	1.79	1.083	0.78
881	1 791.9	11.20	17.40	2.35	9.01	1.64	0.39	1.44	0.22	1.31	0.27	0.72	0.11	0.74	0.10	7.01	46.9	1.43	1.191	0.80
883	1 792.8	12.80	20.00	2.59	9.96	1.72	0.47	1.56	0.25	1.46	0.31	0.88	0.13	0.87	0.12	8.43	53.1	1.39	1.347	0.82
887	1 795.75	23.10	36.40	4.59	17.20	3.13	0.69	2.80	0.45	2.71	0.56	1.59	0.25	1.61	0.22	15.20	95.3	1.35	1.094	0.83

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表 3 湖南桃源叶溪堉、理公港和张家界田坪剖面留茶坡组-牛蹄塘组硅质岩主量元素分析结果

Table 3. Major element contents in siliceous rocks of Liuchapo-Niutitang Formation in Yexiyu section, Ligonggang section of Taoyuan, Tianping section of Zhangjiajie, Hunan Province

样号	SiO₂	Al₂O₃	Fe₂O₃	FeO	CaO	MgO	K₂O	Na₂O	TiO₂	P₂O₅	MnO	灼失	Al/(Al+Fe+Mn)
样号	w_B/%												Al/(Al+Fe+Mn)
YXY∈₁n-6Si	81.81	6.770	0.030	1.09	0.191	0.614	1.610	0.840	0.346	0.020	0.009 4	6.250	0.80
YXY∈₁n-5Si	85.10	4.860	0.013	0.93	0.071	0.412	1.140	0.684	0.254	0.016	0.011	6.170	0.77
YXY∈₁n-4Si	82.50	6.390	0.233	1.03	0.045	0.535	1.480	0.825	0.311	0.016	0.008 9	6.230	0.77
YXY∈₁n-3Si	84.72	4.410	0.011	0.993	0.119	0.399	1.000	0.613	0.236	0.023	0.008 9	7.090	0.74
YXYZ₂l-2Si	69.53	7.390	1.360	0.981	0.135	5.930	1.190	0.590	0.468	0.061	0.020	12.020	0.69
YXYZ₂l-3Si	76.09	8.320	0.370	0.659	0.047	0.684	2.180	1.080	0.567	0.017	0.0069	9.530	0.85
LGG∈₁n-12Si	91.62	3.010	0.521	1.82	0.023	0.428	0.867	0.070	0.196	0.033	0.021	0.696	0.46
LGGZ₂l-11Si	94.73	1.570	0.360	2.16	0.022	0.218	0.482	0.060	0.076	0.028	0.024	< 0.001	0.29
LGGZ₂l-10Si	88.82	4.040	1.380	1.54	0.254	0.482	1.480	0.072	0.183	0.224	0.024	0.991	0.49
LGGZ₂l-9Si	94.67	0.804	0.047	3.37	0.042	0.153	0.200	0.062	0.050	0.021	0.036	< 0.001	0.13
LGGZ₂l-8Si	95.67	0.777	0.030	2.31	0.028	0.129	0.140	0.065	0.046	0.019	0.028	0.423	0.18
LGGZ₂l-7Si	96.53	0.563	0.132	1.42	0.019	0.117	0.123	0.060	0.043	0.016	0.046	0.568	0.19
LGGZ₂l-6Si	96.00	0.413	0.308	2.06	0.048	0.100	0.086	0.058	0.024	0.038	0.024	0.467	0.10
LGGZ₂l-5Si	95.37	0.483	0.0044	2.86	0.025	0.105	0.092	0.060	0.021	0.038	0.039	0.495	0.10
LGGZ₂l-4Si	95.35	0.410	0.072	3.08	0.200	0.104	0.080	0.062	0.021	0.143	0.055	< 0.001	0.08
LGGZ₂l-3Si	95.69	0.368	0.087	2.60	0.043	0.106	0.071	0.069	0.022	0.017	0.043	0.511	0.08
LGGZ₂l-2Si	94.57	0.231	0.011	4.37	0.015	0.088	0.024	0.059	0.015	0.014	0.058	< 0.001	0.03
LGGZ₂l-1Si	95.52	0.490	0.594	2.60	0.024	0.110	0.102	0.064	0.025	0.015	0.046	< 0.001	0.09
TP∈₁n-1Si	86.54	5.620	0.258	1.36	0.238	0.498	2.860	0.092	0.352	0.246	0.010	1.120	0.70
TP∈₁n-2Si	86.56	3.630	1.180	3.04	0.090	0.277	2.010	0.089	0.230	0.103	0.041	2.020	0.36
TPZ₂l-3Si	94.18	1.100	0.017	2.85	0.037	0.127	0.475	0.066	0.136	0.023	0.040	< 0.001	0.20
TPZ₂l-4Si	84.72	6.000	2.030	1.07	0.030	0.516	2.770	0.091	0.386	0.031	0.007 9	1.500	0.58
TPZ₂l-5Si	93.12	1.200	0.247	3.42	0.114	0.160	0.525	0.078	0.138	0.064	0.031	< 0.001	0.18
TPZ₂l-6Si	95.15	0.626	0.243	2.79	0.023	0.104	0.166	0.076	0.042	0.013	0.045	0.232	0.12

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表 4 湖南桃源叶溪堉、理公港和张家界田坪剖面留茶坡组-牛蹄塘组硅质岩稀土元素分析结果

Table 4. Rare earth element contents in siliceous rocks of Liuchapo-Niutitang Formation in Yexiyu section, Ligonggang section of Taoyuan, Tianping section of Zhangjiajie, Hunan Province

样品名	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	ΣREE	(La/Yb)_N	δEu	δCe
样品名	w_B/10^-6																(La/Yb)_N	δEu	δCe
YXY∈₁n-6	14.60	29.20	2.97	10.20	1.38	0.30	1.21	0.19	1.26	0.30	0.94	0.16	1.18	0.16	7.80	64.05	1.17	1.09	1.05
YXY∈ ₁ n-5	12.10	23.40	2.37	7.99	1.10	0.27	1.05	0.18	1.26	0.29	0.87	0.14	0.95	0.13	7.81	52.10	1.20	1.18	1.04
YXY∈ ₁ n-4	15.20	27.20	2.70	8.91	1.11	0.29	1.01	0.16	1.11	0.27	0.88	0.15	1.08	0.16	7.38	60.23	1.33	1.29	1.01
YXY∈ ₁ n-3	12.50	23.50	2.43	8.43	1.22	0.28	1.07	0.17	1.11	0.26	0.83	0.14	0.99	0.15	7.27	53.08	1.19	1.15	1.01
YXYZ ₂ l-2	26.50	48.80	4.80	18.00	3.31	0.78	2.94	0.48	2.90	0.62	1.81	0.30	1.98	0.27	17.70	113.49	1.26	1.17	1.03
YXYZ ₂ l-3	22.50	42.10	4.30	14.80	1.88	0.39	1.82	0.29	1.99	0.48	1.48	0.26	1.71	0.25	14.50	94.25	1.24	0.99	1.02
LGG∈ ₁ n-12	5.02	8.41	1.13	4.27	0.91	0.27	0.90	0.16	1.08	0.23	0.69	0.12	0.81	0.11	6.08	24.11	0.58	1.40	0.84
LGGZ ₂ l-11	3.38	5.40	0.57	1.96	0.36	0.09	0.30	0.04	0.25	0.05	0.16	0.03	0.18	0.02	1.36	12.79	1.77	1.30	0.92
LGGZ ₂ l-10	3.00	5.90	0.96	5.08	2.00	0.53	1.80	0.30	1.80	0.34	0.85	0.12	0.77	0.10	8.46	23.55	0.37	1.31	0.82
LGGZ ₂ l-9	2.39	3.16	0.52	1.97	0.39	0.15	0.37	0.07	0.50	0.12	0.35	0.06	0.43	0.07	2.61	10.54	0.52	1.85	0.67
LGGZ ₂ l-8	3.93	6.53	0.99	4.24	0.85	0.21	0.82	0.16	1.18	0.26	0.75	0.12	0.84	0.12	7.03	21.00	0.44	1.18	0.79
LGGZ ₂ l-7	2.58	4.96	0.72	3.27	0.64	0.22	0.63	0.12	0.89	0.23	0.75	0.14	0.98	0.15	8.43	16.28	0.25	1.63	0.86
LGGZ ₂ l-6	4.42	7.15	1.08	4.81	1.12	0.25	1.15	0.20	1.38	0.32	1.00	0.16	1.11	0.16	11.60	24.31	0.38	1.03	0.78
LGGZ ₂ l-5	3.41	6.19	1.04	4.90	1.32	0.34	1.38	0.28	1.98	0.44	1.29	0.21	1.43	0.20	13.90	24.41	0.22	1.18	0.78
LGGZ ₂ l-4	4.30	4.24	0.91	4.37	1.88	0.51	2.08	0.35	2.23	0.47	1.30	0.20	1.27	0.18	15.70	24.29	0.32	1.21	0.51
LGGZ ₂ l-3	1.94	2.54	0.35	1.53	0.38	0.12	0.46	0.09	0.69	0.17	0.54	0.08	0.65	0.09	6.53	9.64	0.28	1.35	0.73
LGGZ ₂ l-2	1.75	3.09	0.74	3.81	1.50	0.47	1.67	0.36	2.43	0.46	1.12	0.16	1.04	0.12	10.30	18.72	0.16	1.39	0.64
LGGZ ₂ l-1	4.30	4.02	0.96	3.82	0.82	0.20	0.82	0.15	1.00	0.22	0.64	0.10	0.71	0.10	7.31	17.86	0.57	1.14	0.47
TP∈ ₁ n-1	18.80	26.40	3.87	14.20	2.55	0.59	2.42	0.39	2.39	0.51	1.47	0.24	1.66	0.24	14.00	75.73	1.07	1.11	0.73
TP∈ ₁ n-2	14.70	19.80	2.97	10.70	1.79	0.48	1.71	0.27	1.64	0.34	1.00	0.17	1.19	0.17	8.40	56.93	1.16	1.29	0.71
TPZ ₂ l-3	2.23	3.37	0.54	1.83	0.25	0.31	0.28	0.05	0.36	0.09	0.31	0.05	0.40	0.06	2.38	10.12	0.53	5.50	0.73
TPZ ₂ l-4	14.30	20.30	2.25	6.40	0.56	0.19	0.67	0.10	0.84	0.24	0.87	0.18	1.35	0.20	6.14	48.45	1.00	1.46	0.85
TPZ ₂ l-5	6.44	9.20	1.40	4.87	0.76	0.44	0.70	0.11	0.71	0.16	0.46	0.08	0.54	0.08	3.91	25.95	1.12	2.83	0.73
TPZ ₂ l-6	0.73	1.40	0.20	0.86	0.25	0.14	0.31	0.07	0.57	0.13	0.40	0.06	0.48	0.07	3.35	5.67	0.14	2.36	0.87

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