西藏阿里仲巴地块公珠错片麻岩锆石U-Pb年代学及其地质意义

李生伟; 韦梅华; 黄庭; 刘强

doi:10.19509/j.cnki.dzkq.2021.0085

西藏阿里仲巴地块公珠错片麻岩锆石U-Pb年代学及其地质意义

doi: 10.19509/j.cnki.dzkq.2021.0085

1.
青海大学地质工程系, 西宁 810016
2.
山西省第一水文地质工程地质队, 太原 030024
3.
中国地质大学(武汉)地球科学学院, 武汉 430074

基金项目:

中国地质调查局项目 1212011221066

详细信息

作者简介:
李生伟(1979—), 男, 讲师, 主要从事工程地质学与区域地质研究工作。E-mail: lishengweiqh@163.com

中图分类号: P588.345
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- 文章访问数: 271
- PDF下载量: 47
- 被引次数: 0
出版历程
- 收稿日期: 2021-07-07

Zircon U-Pb geochronology of the Gongzhu Co gneiss in the Zhongba block from Ali, Tibet and its geological significance

1.
Department of Geological Engineering, Qinghai University, Xining 810016, China
2.
The First Hydrogeology Engineering Geological Team of Shanxi Province, Taiyuan 030024, China
3.
School of Earth Sciences, China University of Geosciences(Wuhan), Wuhan 430074, China

摘要

摘要:
仲巴地块是藏南雅鲁藏布江缝合带西段的重要构造单元, 对于研究冈瓦纳大陆北缘微地块的构造属性与古地理重建具有重要意义。目前, 对于该地块内部是否存在陆块基底尚未有统一认识。通过野外观测、岩石地球化学和锆石U-Pb年代学分析, 本研究在仲巴地块中段公珠错南地区识别出一套黑云斜长片麻岩, 其w(SiO₂)为64.09%~69.87%, w(Al₂O₃)为12.18%~18.30%, w(TiO₂)为0.55%~0.79%, w(K₂O)为2.53%~3.54%, LREE相对富集, 轻重稀土分馏明显, 推测其原岩以长石砂岩为主, 形成于活动大陆边缘环境。锆石U-Pb年代学分析结果显示, 其继承核年龄峰值为2500, 1600, 950Ma, 最年轻的谐和年龄为630Ma。此外, 还获得变质锆石的加权平均年龄为550Ma。根据上述结果, 研究认为公珠错片麻岩形成于新元古代晚期(630~550Ma), 其变形-变质程度较高, 能够代表仲巴地块的陆块基底, 并进一步证明仲巴地块是印度大陆北缘的组成部分。由此, 本次研究为明确雅鲁藏布江缝合带西段仲巴地块的陆块基底特征及构造属性提供了直接的地质证据。
- 锆石年代学 /
- 雅鲁藏布缝合带 /
- 仲巴地块 /
- 公珠错 /
- 片麻岩
Abstract:
The Zhongba block, an important tectonic unit of the western segment of the Indus-Tsangpo suture zone (ITSZ) in southern Tibet, is significant for determining tectonic affinity and paleogeographic reconstruction along the northern margin of the Gondwana. However, whether the continental basement of the Zhongba block exists is still a controversial issue. In this contribution, integrated with field observations, whole-rock geochemistry and zircon geochronology allow us to identify a biotite-plagioclase gneiss suite in the southern region of Gongzhu Co from the central Zhongba block. The gneiss has 64.09%-69.87% SiO₂, 12.18%-18.30% Al₂O₃, 0.55%-0.79% TiO₂ and 2.53%-3.54% K₂O. It is enriched in light rare earth elements (LREEs) and has a high LREE/HREE ratio.It was proposed that the protoliths of the gneiss may be sedimentary rocks, dominated by feldspar sandstones, which had formed in an active continental marginal environment. Zircon dating result shows that the peak ages of inherited zircon cores are 950 Ma, 1600 Ma, and 2500 Ma, respectively, with the youngest age of ~630 Ma. Moreover, the metamorphic zircon rim yielded a weighted mean age of ~550 Ma. Based on these results, the Gongzhu Co gneiss was supposed to form in the Late Neoproterozoic (630-550 Ma) and subsequently underwent a high-grade metamorphism. Combined with previous results, the Gongzhu Co gneiss should represent the continental basement of the Zhongba block. This further implies that the Zhongba block belonged to northern margin of the Indian continent. Therefore, this study provides vigorous evidence for clarifying the characteristics of continental basement as well as tectonic affinity of the Zhongba block.
- zircon geochronology /
- the Indus-Tsangpo suture zone /
- Zhongba Block /
- Gongzhu Co /
- gneiss

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图 1 仲巴地块大地构造位置(a)(据文献[1]修改)与研究区地质简图(b)(据文献[2-3]修改)

Figure 1. Tectonic location of the Zhongba block(a) and simplified geological map of the study area (b)

下载: 全尺寸图片幻灯片

图 2 公珠错黑云斜长片麻岩野外特征与显微照片

a.黑云斜长片麻岩野外特征；b.混合岩化片麻岩野外特征；c.片麻岩样品(15SB-1)主要组成矿物(正交光)；d.混合岩化片麻岩样品(PM043-0-1)主要组成矿物(正交光); Pl.斜长石; Qz.石英; Bt.黑云母; Kfs.钾长石

Figure 2. Field photographs and micrographs of biotite-plagioclase gneiss from the Gongzhu Co area

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图 3 公珠错片麻岩稀土元素球粒陨石标准化配分图(a)与微量元素原始地幔标准化蛛网图(b)(标准化数据根据文献[29])

Figure 3. Chondrite-normalized REE patterns (a) and primitive-mantle-normalized trace element spidergram (b) of the Gongzhu Co gneiss

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图 4 公珠错片麻岩中典型的锆石阴极发光图像

锆石中红色圆圈为激光剥蚀位置, 外侧数字为对应测点U-Pb年龄

Figure 4. Representative cathodoluminescence (CL) images of the zircons from the Gongzhu Co gneiss

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图 5 锆石年龄与Th/U比值的相关性图(a)和稀土元素球粒陨石标准化配分图(b)

Figure 5. Plot for zircons U-Pb ages and Th/U values(a), chondrite-normalized REE patterns for zircons from the Gongzhu Co gneiss (b)

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图 6 公珠错片麻岩锆石继承核U-Pb年龄谐和图(a)及分布频率图(b)

Figure 6. Zircon U-Pb ages (a) and distribution (b) of the inherited core from the Gongzhu Co gneiss

下载: 全尺寸图片幻灯片

图 7 公珠错片麻岩原岩类型判别图解(A底图据文献[32]; B底图据文献[31, 34])

K=100*[K₂O/(K₂O+Na₂O)]; A=100*Al₂O₃/(Al₂O₃+CaO+K₂O+Na₂O)
Ⅰ.石英砂岩; Ⅱ.少量矿物砂岩、石英质砂岩; Ⅲ.复矿物砂岩; Ⅳ.长石砂岩; Ⅴ.钙质砂岩和含铁砂岩; Ⅵ.化学上弱分异的沉积物(a.主要为杂砂岩; b.主要为复矿物粉砂岩; c.泥质砂岩及寒带和温带气候的陆相黏土); Ⅶ.化学上中等分异的黏土、寒带和温带气候的海相和陆相黏土; Ⅷ.潮湿气候带化学强分异的黏土; Ⅸ.碳酸盐质黏土和含铁黏土; Ⅹ.泥灰岩; Ⅺ.硅质泥灰岩和含铁砂岩; Ⅻ.含铁石英岩; x_i为其余组分

Figure 7. Discrimination of protolith types for the Gongzhu Co gneiss

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图 8 片麻岩构造环境判别图解(底图据文献[38])

A.大洋岛弧；B.大陆岛弧；C.活动大陆边缘；D.被动大陆边缘

Figure 8. Tectonic discrimination diagrams for the gneiss

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图 9 公珠错片麻岩锆石继承核年龄谱图及与碎屑锆石对比

a据文献[43-45]; b据文献[46-48]; c据文献[49-50]; d据文献[43, 51]; e, f据文献[19, 22]; g为本研究

Figure 9. Relative U-Pb age probability for inherited cores zircons from the Gongzhu Co gneiss, comparing with those of detrital zircons from the Zhongba block and other tectonic units

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表 1 公珠错片麻岩主量元素与微量元素分析结果

Table 1. Major and trace element data of the Gongzhu Co gneiss

样品编号	15SB-1	15SB-2	15SB-3	PM043-0-1
岩石名称	黑云斜长片麻岩	黑云斜长片麻岩	黑云斜长片麻岩	混合片麻岩
SiO₂	68.40	64.09	69.87	68.00
TiO₂	0.68	0.79	0.55	0.10
Al₂O₃	17.30	16.12	12.18	18.30
Fe₂O₃	6.42	5.79	6.57	1.15
MnO	0.12	0.11	0.11	0.03
MgO w_B/%	1.54	2.42	2.84	0.36
CaO	0.11	4.00	0.72	1.86
Na₂O	0.78	2.88	2.36	7.35
K₂O	2.66	2.53	3.54	1.66
P₂O₅	0.05	0.18	0.09	0.10
LOI	1.80	0.72	0.86	0.45
总量	99.86	99.63	99.69	99.36
TFeO	5.78	5.21	5.91	1.03
Sc	22.0	14.7	10.9	3.10
V	105.00	80.91	70.81	4.00
Cr	87.00	83.22	226.23	5.00
Co	12.2	15.2	10.4	1.3
Ni	80.80	37.27	35.20	7.30
Cu	21.70	7.99	2.45	1.60
Zn	43.0	102	207	19.0
Ga	17.6	23.1	23.6	22.8
Rb	131.00	217.19	451.42	83.00
Sr	66.10	238.45	37.98	102.00
Y	18.80	37.12	26.46	96.70
Zr	100.00	204.89	141.26	169.00
Nb	17.10	17.78	21.98	12.40
Cs	8.01	21.4	35.4	4.54
Ba	425.00	553.80	120.46	76.40
La	37.40	49.15	31.38	85.80
Ce w_B/10^-6	80.10	93.76	61.51	173.00
Pr	7.54	10.80	6.86	18.45
Nd	25.00	40.34	27.39	57.10
Sm	4.92	7.92	5.68	13.60
Eu	1.03	1.44	0.94	0.84
Gd	3.91	6.41	4.84	11.70
Tb	0.55	1.02	0.74	2.03
Dy	3.39	6.20	4.71	13.00
Ho	0.69	1.26	0.88	2.91
Er	2.03	3.47	2.39	9.55
Tm	0.30	0.50	0.34	1.53
Yb	1.83	3.49	2.36	10.10
Lu	0.29	0.50	0.34	1.49
Hf	2.80	5.36	3.84	6.70
Ta	1.13	1.47	2.23	1.48
Pb	16.20	15.03	15.71	42.80
Th	14.40	21.87	13.27	74.00
U	1.65	3.21	4.71	8.19
ΣREE	168.98	226.26	150.38	401.10
LREE/HREE	12.01	8.90	8.05	6.67
(La/Yb)_N	14.66	10.11	9.52	6.09
δEu	0.69	0.60	0.54	0.20
δCe	1.10	0.95	0.98	1.02
DF	-4.85	0.53	-3.37	8.09

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表 2 公珠错地区片麻岩LA-ICP-MS锆石U-Pb定年结果

Table 2. LA-ICP-MS zircon U-Pb dating results for the Gongzhu Co gneiss

样品编号	Pb	U	Th	Th/U	同位素比值						同位素年龄/Ma						谐和度/%
样品编号	w_B/10^-6			Th/U	²⁰⁷Pb/²⁰⁶Pb	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ	²⁰⁷Pb/²⁰⁶Pb	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ	谐和度/%
黑云斜长片麻岩15SB-1
-01	295	1 971	356	0.18	0.065 9	0.001 1	1.000 3	0.017 1	0.109 6	0.001 0	806	35.2	704	8.7	670	5.7	95
-02	366	1 115	608	0.55	0.071 2	0.001 4	1.208 1	0.026 7	0.122 7	0.001 8	965	43.5	804	12.3	746	10.3	92
-03	428	1 973	235	0.12	0.078 4	0.001 1	1.856 3	0.028 7	0.170 7	0.001 4	1 167	27.8	1 066	10.2	1 016	7.9	95
-04	186	622	243	0.39	0.072 0	0.001 4	1.489 4	0.027 6	0.149 9	0.001 5	987	43.5	926	11.3	900	8.4	97
-05	344	239	136	0.57	0.205 2	0.003 2	15.140 3	0.240 0	0.533 6	0.005 2	2 868	25.3	2 824	15.1	2 757	21.8	97
-06	558	1 575	783	0.50	0.071 6	0.001 2	1.495 8	0.027 7	0.150 9	0.001 6	976	35.2	929	11.3	906	9.1	97
-07	171	658	155	0.24	0.074 1	0.001 5	1.736 7	0.040 8	0.169 9	0.002 7	1 056	38.0	1 022	15.1	1 011	15.1	98
-08	302	271	445	1.64	0.076 5	0.002 0	1.954 7	0.050 5	0.185 1	0.002 1	1 109	50.8	1 100	17.3	1 095	11.3	99
-09	611	1 526	943	0.62	0.068 6	0.001 1	1.388 2	0.021 7	0.146 2	0.001 0	887	33.3	884	9.2	880	5.9	99
-10	335	486	460	0.95	0.078 5	0.001 5	2.023 6	0.040 6	0.186 2	0.001 6	1 161	38.9	1 123	13.6	1 101	8.7	97
-11	318	252	147	0.59	0.164 1	0.002 7	10.813 4	0.205 5	0.477 1	0.006 3	2 498	26.7	2 507	17.7	2 514	27.7	99
-12	669	1 557	302	0.19	0.113 0	0.001 8	4.506 3	0.074 7	0.288 1	0.002 7	1 850	28.2	1 732	13.8	1 632	13.4	94
-13	917	724	471	0.65	0.167 6	0.002 6	9.853 7	0.161 7	0.424 3	0.003 5	2 600	24.8	2 421	15.1	2 280	16.0	93
-14	294	513	450	0.88	0.071 6	0.001 6	1.589 0	0.034 5	0.160 8	0.001 4	976	45.5	966	13.6	961	8.0	99
-15	373	682	511	0.75	0.076 8	0.001 5	1.786 2	0.034 2	0.169 4	0.002 0	1 117	38.9	1 040	12.5	1 009	11.2	96
-16	511	683	842	1.23	0.071 3	0.001 3	1.588 0	0.027 7	0.161 2	0.001 4	965	40.9	966	10.9	964	7.8	99
-17	604	1 086	846	0.78	0.075 0	0.001 3	1.843 8	0.032 5	0.177 6	0.001 6	1 133	33.8	1 061	11.6	1 054	8.5	99
-18	2435	3 396	1897	0.56	0.100 3	0.001 5	3.846 4	0.062 3	0.276 6	0.002 5	1 629	-171.3	1 603	13.1	1 574	12.5	98
-19	572	2 495	904	0.36	0.062 9	0.001 1	1.067 4	0.019 4	0.122 4	0.001 1	706	4.6	737	9.5	744	6.2	99
-20	243	831	220	0.27	0.075 6	0.001 4	1.898 8	0.034 7	0.181 6	0.001 9	1 087	35.6	1 081	12.2	1 076	10.3	99
-21	139	356	155	0.44	0.072 9	0.001 5	1.815 3	0.040 7	0.180 0	0.002 1	1 009	42.6	1 051	14.7	1 067	11.3	98
-22	437	2 174	334	0.15	0.072 7	0.001 1	1.622 7	0.024 4	0.161 0	0.001 2	1 006	29.6	979	9.5	962	6.8	98
-23	318	602	414	0.69	0.079 7	0.001 6	1.968 7	0.040 2	0.179 1	0.001 9	1 189	40.0	1 105	13.8	1 062	10.3	96
-24	488	1 109	564	0.51	0.078 5	0.001 4	2.042 3	0.038 4	0.188 1	0.002 1	1 161	35.2	1 130	12.8	1 111	11.3	98
-25	91	393	181	0.46	0.061 8	0.001 9	0.875 6	0.027 7	0.102 5	0.001 1	665	66.7	639	15.0	629	6.4	98
-26	159	448	316	0.70	0.063 1	0.001 6	1.058 0	0.025 0	0.121 9	0.001 2	722	53.7	733	12.3	742	7.0	98
-27	325	347	286	0.82	0.097 2	0.001 9	3.678 9	0.071 4	0.273 9	0.002 4	1 572	31.3	1 567	15.5	1 561	12.3	99
-28	271	608	372	0.61	0.075 2	0.001 3	1.687 4	0.029 4	0.162 2	0.001 3	1 072	33.8	1 004	11.1	969	7.3	96
-29	1419	2 131	1783	0.84	0.084 4	0.000 9	2.283 5	0.026 3	0.194 9	0.001 1	1 302	19.0	1 207	8.1	1 148	5.7	94
-30	119	137	157	1.15	0.080 7	0.002 2	2.167 8	0.055 3	0.195 8	0.002 2	1 217	58.3	1 171	17.7	1 153	11.9	98
-31	242	393	640	1.63	0.063 8	0.001 7	0.896 0	0.022 6	0.102 1	0.000 8	744	56.3	650	2.1	626	5.0	96
-32	137	203	123	0.60	0.098 6	0.002 0	3.351 7	0.066 5	0.246 5	0.002 2	1 598	37.0	1 493	15.5	1 421	11.6	95
-33	304	638	558	0.88	0.067 8	0.001 0	1.240 2	0.019 6	0.132 0	0.001 0	865	31.5	819	8.9	799	5.5	97
-34	398	2 173	143	0.07	0.080 2	0.000 6	1.973 9	0.016 9	0.177 5	0.000 9	1 267	14.8	1 107	5.8	1 054	5.0	95
-35	84	218	102	0.47	0.074 5	0.002 0	1.643 7	0.043 8	0.160 2	0.001 7	1 054	53.7	987	16.8	958	9.4	97
-36	1046	1 890	1446	0.76	0.075 8	0.000 6	1.668 4	0.015 6	0.158 7	0.001 0	1 100	15.6	997	5.9	950	5.5	95
-37	642	1 851	671	0.36	0.075 4	0.000 7	1.843 4	0.019 1	0.176 4	0.001 0	1 080	18.5	1 061	6.8	1 047	5.5	98
-38	119	689	168	0.24	0.064 1	0.001 2	0.958 8	0.019 9	0.108 0	0.001 1	746	40.7	683	10.3	661	6.3	96
-39	160	567	252	0.45	0.063 7	0.001 4	1.059 9	0.023 0	0.120 3	0.001 2	731	46.3	734	11.4	733	6.9	99
-40	200	147	306	2.08	0.077 7	0.002 4	2.037 3	0.061 7	0.191 4	0.002 6	1 139	61.6	1 128	20.6	1 129	14.1	99
-41	397	951	522	0.55	0.074 8	0.001 3	1.669 7	0.029 1	0.160 9	0.001 2	1 065	34.4	997	11.1	962	6.9	96
-42	158	332	218	0.66	0.074 4	0.001 9	1.657 5	0.043 2	0.161 1	0.001 8	1 054	51.1	992	16.5	963	10.0	96
-43	1221	1 710	637	0.37	0.136 0	0.002 8	6.331 2	0.154 7	0.336 1	0.004 6	2 177	35.2	2 023	21.4	1 868	22.0	92
-44	212	1 384	273	0.20	0.063 6	0.001 2	0.958 2	0.019 5	0.108 5	0.001 0	728	40.7	682	10.1	664	5.9	97
-45	149	262	228	0.87	0.072 9	0.001 9	1.471 5	0.038 1	0.147 0	0.002 3	1 009	47.2	919	15.7	884	12.7	96
-46	983	1 291	514	0.40	0.127 7	0.001 5	6.195 7	0.075 6	0.349 9	0.002 5	2 066	15.6	2 004	10.7	1 934	11.8	96
混合岩化片麻岩PM043-0-1
-1	39.9	115	41.1	0.36	0.069 5	0.003 0	1.404 7	0.065 0	0.146 4	0.002 8	922	82.4	891	27.4	880	15.7	98
-2	39.9	115	41.1	0.36	0.069 5	0.003 0	1.404 7	0.065 0	0.146 4	0.002 8	922	82.4	891	27.4	880	15.7	98
-4	728	759	451	0.59	0.102 7	0.001 8	3.927 8	0.072 3	0.276 0	0.002 1	1 673	32.6	1 619	14.9	1 571	10.6	96
-6	799	1 525	1 089	0.71	0.065 2	0.001 2	1.201 5	0.023 9	0.133 3	0.001 2	781	40	801	11	806	6.8	99
-8	224	649	325	0.5	0.061 5	0.001 4	0.876 6	0.021 8	0.103 1	0.001 4	655	48.1	639	11.8	633	8.1	98
-10	530	824	774	0.94	0.06 7	0.001 3	1.206 3	0.023 4	0.129 9	0.000 9	839	40.7	803	10.8	787	5	97
-13	194	178	127	0.71	0.100 4	0.002 2	3.947 3	0.088 5	0.284 0	0.002 5	1 631	40.9	1 623	18.2	1 612	12.7	99
-16	287	741	424	0.57	0.072 8	0.001 4	1.490 1	0.028 2	0.148 1	0.001 4	1 009	43.5	926	11.5	890	7.6	96
-18	1072	1 558	1 446	0.93	0.074 3	0.001 2	1.882 8	0.032 0	0.182 8	0.001 6	1 050	33.3	1075	11.3	1 082	8.6	99
-21	436	2 921	518	0.18	0.063 7	0.000 9	0.971 3	0.014 6	0.110 0	0.000 9	731	29.6	689	7.5	673	5.1	97
-24	136	931	280	0.3	0.063 8	0.001 6	0.813 3	0.022 7	0.091 7	0.001 3	744	51.8	604	12.7	566	7.9	93
-25	1036	1 858	1 479	0.8	0.076 3	0.001 4	1.731 3	0.030 9	0.163 8	0.001 4	1 102	37	1 020	11.5	978	7.6	95
-27	2040	3 133	718	0.23	0.155 2	0.002 0	8.338 5	0.115 3	0.386 3	0.003 0	2 406	22.2	2 269	12.5	2 106	14.1	92
-28	493	2 969	442	0.15	0.068 7	0.001 0	1.276 5	0.020 3	0.133 6	0.001 4	900	30.7	835	9.1	809	7.7	96
-29	361	769	507	0.66	0.071 9	0.001 4	1.624 7	0.033 3	0.162 4	0.001 7	983	45.4	980	12.9	970	9.7	99
-30	437	1 273	411	0.32	0.080 9	0.001 5	1.860 5	0.059 9	0.162 7	0.003 8	1 218	37.3	1 067	21.3	972	20.9	90
-31	278	267	384	1.44	0.077 5	0.002 2	2.045 9	0.054 5	0.191 5	0.002 2	1 144	54.5	1 131	18.2	1 129	11.7	99
-33	78.1	574	153	0.27	0.059 2	0.001 8	0.711 7	0.020 0	0.087 3	0.000 8	576	64.8	546	11.9	540	5	98
-40	317	1 020	170	0.17	0.088 1	0.001 6	2.867 5	0.063 2	0.234 0	0.002 9	1 384	33.8	1 373	16.6	1 355	15.4	98
-43	391	2 854	648	0.23	0.060 0	0.001 0	0.765 0	0.015 1	0.092 0	0.001 1	611	37	577	8.7	567	6.8	98
-44	248	995	489	0.49	0.066 4	0.001 4	0.961 2	0.026 0	0.103 7	0.001 7	820	46.3	684	13.4	636	9.7	92
-47	381	1 060	447	0.42	0.072 5	0.001 4	1.745 3	0.033 4	0.173 4	0.001 6	998	37.8	1 025	12.3	1 031	8.5	99
-52	385	3 188	491	0.15	0.057 9	0.001 0	0.705 0	0.013 9	0.087 7	0.001 0	528	32.4	542	8.3	542	5.7	99
-53	83.1	236	85.1	0.36	0.073 6	0.002 0	1.826 0	0.051 5	0.179 9	0.002 2	1 031	54.5	1 055	18.5	1 066	12	98
-56	666	371	489	1.32	0.118 1	0.002 0	5.924 3	0.103 1	0.362 7	0.003 0	1 928	30.4	1 965	15.1	1 995	14.3	98
-57	206	232	186	0.8	0.093 5	0.002 1	3.515 0	0.079 1	0.272 5	0.002 9	1 498	42.1	1 531	17.8	1 554	14.7	98
-59	331	1 216	448	0.37	0.067 6	0.001 2	1.298 8	0.025 2	0.138 6	0.0013	854	41.7	845	11.1	837	7.4	98
-62	232	538	305	0.57	0.069 2	0.001 4	1.606 6	0.031 4	0.167 8	0.001 5	906	40.7	973	12.2	1 000	8.5	97
-63	1131	4 581	1 051	0.23	0.076 5	0.001 2	1.571 4	0.056 5	0.144 5	0.004 0	1 107	31.5	959	22.3	870	22.7	90

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