Zircon U-Pb Age and Lu-Hf Isotopes for Middle Jurassic Gabbro-diorite in Southern Margin of Gangdese Magmatic Belt and Its Tectonic Implications

doi:10.19657/j.geoscience.1000-8527.2019.01.07

Abstract

Abstract:

In order to elucidate the tectonic setting and magma source of the gabbro-diorite in the southern margin of the Gangdese magmatic belt, we conducted zircon U-Pb age and Lu-Hf isotope analyses, and whole-rock major and trace elements analyses. The zircon U-Pb dating yielded (165±1.1) Ma for the gabbro-diorite. Geochemically, the gabbro-diorite is enriched in LILEs, Al₂O₃ and K₂O, but depleted in HFSEs. The sample data points are distributed in the island arc field in tectonic discrimination diagrams, and have clear island arc geochemical affinities.The chondrite-normalized REE patterns are flat with no Eu anomalies, showing low degree of magma differentiation. The mean (La/Yb)_N value is 2.30(<4.3), and the rocks have similar REE patterns to typical mantle-derived magmas. The gabbro-diorite samples have highly depleted zircon Hf isotopic compositions, with ε_Hf(t) values of 12.97-18.74 and two-stage Hf model ages of 150-218 Ma, indicating that the mantle-derived magma was influenced by crustal assimilation. Integrated whole-rock geochemical and zircon isotopic analyses suggest that the gabbro-diorite was formed in a mature island arc formed by the Neo-Tethyan subduction, which further indicates that the Gangdese magmatic arc was in a subduction setting during the Middle Jurassic.

Key words: southern margin of Gangdese, Neo-Tethyan subduction, Lu-Hf isotopic, mantle-derived magma

CLC Number:

588.1

YANG Xinpeng, ZHANG Zhenli, ZHANG Zeguo, WANG Jingui, DENG Ke, HOU Dehua. Zircon U-Pb Age and Lu-Hf Isotopes for Middle Jurassic Gabbro-diorite in Southern Margin of Gangdese Magmatic Belt and Its Tectonic Implications[J]. Geoscience, 2019, 33(01): 63-72.

Figures/Tables 13

References 37

[1]	SISSON T W, GROVE T L, COLEMAN D S. Hornblende gabbro sill complex at Onion Valley, California, and a mixing origin for the Sierra Nevada batholith[J]. Contributions to Mineralogy and Petrology, 1996,126(1/2):81-108. DOI URL
[2]	RENNA M R, TRIBUZIO R, TIEPOLO M. Origin and timing of the post-Variscan gabbro-granite complex of Porto (Western Corsica)[J]. Contributions to Mineralogy and Petrology, 2007,154(5):493-517. DOI URL
[3]	ZHANG S H, ZHAO Y, KRÖNER A, et al. Early Permian plutons from the northern North China Block: constraints on continental arc evolution and convergent margin magmatism related to the Central Asian Orogenic Belt[J]. International Journal of Earth Sciences, 2012,98(6):1441-1467. DOI URL
[4]	邱检生, 王睿强, 赵姣龙, 等. 冈底斯中段早侏罗世辉长岩-花岗岩杂岩体成因及其对新特提斯构造演化的启示:以日喀则东嘎岩体为例[J]. 岩石学报, 2015,31(12):3569-3580.
[5]	朱弟成, 潘桂棠, 王立全, 等. 西藏冈底斯带中生代岩浆岩的时空分布和相关问题的讨论[J]. 地质通报, 2008,27(9):1535-1536.
[6]	朱弟成, 潘桂棠, 莫宣学, 等. 冈底斯中北部晚侏罗世—早白垩世地球动力学环境: 火山岩约束[J]. 岩石学报, 2006,22(3):534-546.
[7]	董彦辉, 许继峰, 曾庆高, 等. 存在比桑日群弧火山岩更早的新特提斯洋俯冲记录么?[J]. 岩石学报, 2006,22(3):661-668.
[8]	黄丰, 许继峰, 陈建林, 等. 早侏罗世叶巴组与桑日群火山岩:特提斯洋俯冲过程中的陆缘弧与洋内弧?[J]. 岩石学报, 2015,31(7):2089-2100.
[9]	ZHU D C, ZHAO Z D, NIU Y L, et al. The Lhasa Terrane: Record of a microcontinent and its histories of drift and growth[J]. Earth and Planetary Science Letters, 2011,301(1/2):241-255. DOI URL
[10]	YIN A, HARRISON T M. Geologic evolution of the Himalayan-Tibetan Orogen[J]. Annual Review of Earth & Planetary Sciences, 2000,28:211-280.
[11]	潘桂棠, 王立全, 朱弟成. 青藏高原区域地质调查中几个重大科学问题的思考[J]. 地质通报, 2004,23(1):12-19.
[12]	LIU Y S, GAO S, HU Z C, et al. Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen: U-Pb dating, Hf isotopes and trace elements in zircons from mantle xenoliths[J]. Journal of Petrology, 2010,51:537-571. DOI URL
[13]	侯可军. LA-MC-ICP-MS锆石Hf同位素的分析方法及地质应用[J]. 岩石学报, 2007,23(10):2595-2604
[14]	WU F Y, YANG Y H, XIE L W. Hf isotopic compositions of the standard zircons and baddeleyites used in U-Pb geochronology[J]. Chemical Geology, 2006,234:105-126. DOI URL
[15]	KELEMEN P B, JOHNSON K T M, KINZLER R J, et al. High-field-strength element depletions in arc basalts due to mantle-magma interaction[J]. Nature, 1990,345:521-524. DOI URL
[16]	WANG Y, ZHANG A, FAN W, et al. Origin of paleosubduction-modified mantle for Silurian gabbro in the Cathaysia Block: Geochronological and geochemical evidence[J]. Lithos, 2013,160/161(1):37-54. DOI URL
[17]	MIDDLEMOST E A K. Naming materials in the magma/igneous rock system[J]. Annual Review of Earth & Planetary Sciences, 1994,37(3/4):215-224.
[18]	PECCERILLO A, TAYLOR S R. Geochemistry of eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey[J]. Contributions to Mineralogy and Petrology, 1976,58(1):63-81. DOI URL
[19]	BOYNTON W V. Cosmochemistry of the rare earth elements: meteorite studies[J]. Developments in Geochemistry, 1984,2(2):63-114.
[20]	MCDONOUGH W F, SUN S S. The composition of the Earth[J]. Chemical Geology, 1995,120(3/4):223-253. DOI URL
[21]	GRIFFIN W L, PEARSON N J, BELOUSOVA E. The Hf isotope composition of cratonic mantle: LAM-MC-ICP-MS analysis of zircon megacrysts in kimberlites[J]. Geochimica et Cosmochimica Acta, 2000,64(1):133-147. DOI URL
[22]	PLANK T, LANGMUIR C H. The chemical composition of subducting sediment and its consequences for the crust and mantle[J]. Chemical Geology, 1998,145(3/4):325-394. DOI URL
[23]	AYERS J. Trace element modeling of aqueous fluid-peridotite interaction in the mantle wedge of subduction zones[J]. Contributions to Mineralogy and Petrology, 1998,132(4):390-404. DOI URL
[24]	吴福元, 李献华, 郑永飞, 等. Lu-Hf同位素体系及其岩石学应用[J]. 岩石学报, 2007,23(2):185-220.
[25]	BUSBY C. Continental growth at convergent margins facing large ocean basins: a case study from Mesozoic convergent-margin basins of Baja California, Mexico[J]. Tectonophysics, 2004,392(1/4):241-277. DOI URL
[26]	耿全如, 潘桂棠, 王立全, 等. 西藏冈底斯带叶巴组火山岩同位素地质年代[J]. 沉积与特提斯地质, 2006,26(1):1-7.
[27]	耿全如, 潘桂棠, 金振民, 等. 西藏冈底斯带叶巴组火山岩地球化学及成因[J]. 地球科学, 2005,30(6):747-760.
[28]	ZHU D C, ZHAO Z D, NIU Y, et al. The origin and pre-Cenozoic evolution of the Tibetan Plateau[J]. Gondwana Research, 2013,23(4):1429-1454. DOI URL
[29]	MURPHY M A, YIN A N, HARRISON T M, et al. Did the Indo-Asian collision alone create the Tibetan plateau?[J]. Geology, 2000,8:719-722.
[30]	TAPPONNIER P, XU Z Q, ROGER F, et al. Oblique stepwise rise and growth of the Tibet Plateau[J]. Science, 2001,23:1671-1677.
[31]	朱杰, 杜远生, 刘早学, 等. 西藏雅鲁藏布江缝合带中段中生代放射虫硅质岩成因及其大地构造意义[J]. 中国科学D辑:地球科学, 2005,35(12):1131-1139.
[32]	ZHU D C, PAN G T, WANG L Q, et al. Spatial-temporal distribution and tectonic setting of Jurassic magmatism in the Gangdise belt, Tibet, China[J]. Geological Bulletin of China, 2008,27(4):458-468.
[33]	ZHU D C, PAN G T, WANG L Q, et al. Tempo-spatial variations of Mesozoic magmatic rocks in the Gangdise belt, Tibet, China, with a discussion of geodynamic setting-related issues[J]. Geological Bulletin of China, 2008,27(9):1535-1550.
[34]	张宏飞, 徐旺春, 郭建秋, 等. 冈底斯南缘变形花岗岩锆石U-Pb年龄和Hf同位素组成:新特提斯洋早侏罗世俯冲作用的证据[J]. 岩石学报, 2007,23(6):1347-1353.
[35]	裴树文. 拉萨地块火山岩系内早-中侏罗世双壳类动物群及其古生物地理[J]. 现代地质, 1999,13(3):291-296.
[36]	CHU M F, CHUNG S L, SONG B, et al. Zircon U-Pb and Hf isotope constraints on the Mesozoic tectonics and crustal evolution of southern Tibet[J]. Geology, 2006,34(9):745-748. DOI URL
[37]	ZHU D C, PAN G T, CHUNG S L. SHRIMP zircon age and geochemical constraints on the origin of Early Jurassic volcanic rocks from the Yeba Formation, southern Gangdese in south Tibet[J]. International Geology Review, 2008,50(5):442-471. DOI URL

样品编号	主量元素w_B/%
样品编号	SiO₂			Al₂O₃			TiO₂			Fe₂O₃			FeO			MnO				MgO			CaO			Na₂O			K₂O			P₂O₅			烧失量				∑
D4821YQ1	47.21			19.05			1.08			4.11			5.88			0.18				5.16			8.68			2.00			0.88			0.16			5.47				99.87
D4831YQ1	48.38			18.69			0.89			4.35			4.65			0.17				4.47			9.49			2.55			0.69			0.10			5.45				99.89
D4841YQ1	47.69			19.26			0.98			3.70			5.65			0.17				4.99			8.36			2.45			0.98			0.14			5.52				99.87
D9905YQ1	50.14			20.70			0.90			3.13			4.47			0.13				2.94			6.94			3.64			1.55			0.15			5.20				99.90
D9906YQ1	47.16			18084			1.02			4.03			5.55			0.18				4.86			9.24			2.42			0.70			0.11			5.76				99.88
样品编号	稀土元素w_B/10^-6
样品编号	La	Ce			Pr			Nd			Sm		Eu		Gd			Tb			Dy			Ho		Er		Tm			Yb			Lu			Y		∑REE
D4821XT1	4.32	9.83			1.60			7.62			1.99		0.82		1.99			0.39			2.57			0.51		1.40		0.24			1.54			0.24			12.11		47.17
D4831XT1	3.84	8.44			1.42			6.66			1.77		0.78		1.73			0.36			2.41			0.48		1.35		0.23			1.47			0.25			12.46		43.63
D4841XT1	5.22	11.32			1.85			8.56			2.19		0.87		2.12			0.42			2.82			0.55		1.57		0.28			1.70			0.27			13.78		53.51
D9905XT1	8.02	15.81			2.11			9.32			2.05		0.96		2.00			0.37			2.38			0.48		1.36		0.22			1.43			0.24			14.04		60.77
D9906XT1	4.58	10.04			1.61			7.44			1.93		0.85		1.88			0.36			2.44			0.50		1.41		0.24			1.57			0.26			11.58		46.69
样品编号	微量元素w_B/10^-6
样品编号	Rb		Ba			Th			U			Ta		Nb			La		Ce			Sr			Nd		Zr			Hf			Sm			Yb		Lu
D4821WL1	16.62		208.7			0.21			0.16			0.17		1.66			4.32		9.83			376.5			7.62		63.39			1.93			1.99			1.54		0.24
D4831WL1	13.22		164.7			0.25			0.14			0.19		1.57			3.84		8.44			396.8			6.66		43.62			1.33			1.77			1.47		0.25
D4841WL1	19.69		240.2			0.39			0.20			0.25		1.98			5.22		11.32			383.2			8.56		51.09			1.65			2.19			1.70		0.27
D9905WL1	29.75		226.9			1.06			0.29			0.25		4.24			8.02		15.81			438.2			9.32		58.30			1.67			2.05			1.43		0.24
D9906WL1	13.83		186.0			0.26			0.19			0.24		1.69			4.58		10.04			392.3			7.44		60.27			1.98			1.93			1.57		0.26

样品编号	主量元素w_B/%
样品编号	SiO₂			Al₂O₃			TiO₂			Fe₂O₃			FeO			MnO				MgO			CaO			Na₂O			K₂O			P₂O₅			烧失量				∑
D4821YQ1	47.21			19.05			1.08			4.11			5.88			0.18				5.16			8.68			2.00			0.88			0.16			5.47				99.87
D4831YQ1	48.38			18.69			0.89			4.35			4.65			0.17				4.47			9.49			2.55			0.69			0.10			5.45				99.89
D4841YQ1	47.69			19.26			0.98			3.70			5.65			0.17				4.99			8.36			2.45			0.98			0.14			5.52				99.87
D9905YQ1	50.14			20.70			0.90			3.13			4.47			0.13				2.94			6.94			3.64			1.55			0.15			5.20				99.90
D9906YQ1	47.16			18084			1.02			4.03			5.55			0.18				4.86			9.24			2.42			0.70			0.11			5.76				99.88
样品编号	稀土元素w_B/10^-6
样品编号	La	Ce			Pr			Nd			Sm		Eu		Gd			Tb			Dy			Ho		Er		Tm			Yb			Lu			Y		∑REE
D4821XT1	4.32	9.83			1.60			7.62			1.99		0.82		1.99			0.39			2.57			0.51		1.40		0.24			1.54			0.24			12.11		47.17
D4831XT1	3.84	8.44			1.42			6.66			1.77		0.78		1.73			0.36			2.41			0.48		1.35		0.23			1.47			0.25			12.46		43.63
D4841XT1	5.22	11.32			1.85			8.56			2.19		0.87		2.12			0.42			2.82			0.55		1.57		0.28			1.70			0.27			13.78		53.51
D9905XT1	8.02	15.81			2.11			9.32			2.05		0.96		2.00			0.37			2.38			0.48		1.36		0.22			1.43			0.24			14.04		60.77
D9906XT1	4.58	10.04			1.61			7.44			1.93		0.85		1.88			0.36			2.44			0.50		1.41		0.24			1.57			0.26			11.58		46.69
样品编号	微量元素w_B/10^-6
样品编号	Rb		Ba			Th			U			Ta		Nb			La		Ce			Sr			Nd		Zr			Hf			Sm			Yb		Lu
D4821WL1	16.62		208.7			0.21			0.16			0.17		1.66			4.32		9.83			376.5			7.62		63.39			1.93			1.99			1.54		0.24
D4831WL1	13.22		164.7			0.25			0.14			0.19		1.57			3.84		8.44			396.8			6.66		43.62			1.33			1.77			1.47		0.25
D4841WL1	19.69		240.2			0.39			0.20			0.25		1.98			5.22		11.32			383.2			8.56		51.09			1.65			2.19			1.70		0.27
D9905WL1	29.75		226.9			1.06			0.29			0.25		4.24			8.02		15.81			438.2			9.32		58.30			1.67			2.05			1.43		0.24
D9906WL1	13.83		186.0			0.26			0.19			0.24		1.69			4.58		10.04			392.3			7.44		60.27			1.98			1.93			1.57		0.26

测点	w_B/10^-6		Th/U	同位素比值						年龄/Ma
测点	Pb	U	Th/U	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ
1	10	338	0.80	0.026 0	0.000 4	0.184 0	0.006 5	0.052 1	0.001 9	165	2	171	6	300	81
2	22	708	1.02	0.025 5	0.000 3	0.184 7	0.004 9	0.052 6	0.001 4	163	2	172	4	309	58
3	17	571	0.84	0.025 5	0.000 4	0.184 3	0.009 5	0.052 5	0.002 8	162	3	172	8	306	122
4	23	728	1.02	0.026 1	0.000 4	0.197 5	0.007 2	0.055 0	0.002 0	166	3	183	6	413	84
5	20	652	0.91	0.025 8	0.000 3	0.190 0	0.006 3	0.052 9	0.001 5	164	2	177	5	324	65
6	16	549	0.82	0.025 4	0.000 4	0.156 2	0.006 8	0.044 7	0.001 9	161	3	147	6	203	65
7	26	805	1.16	0.026 1	0.000 3	0.185 5	0.005 1	0.051 7	0.001 4	166	2	173	4	333	61
8	18	542	0.90	0.026 0	0.000 4	0.220 5	0.007 1	0.061 8	0.002 0	166	3	202	6	665	75
9	18	529	1.10	0.026 0	0.000 3	0.181 3	0.006 0	0.050 3	0.001 5	166	2	169	5	206	36
10	21	640	0.97	0.025 6	0.000 4	0.198 3	0.009 2	0.055 9	0.002 4	163	3	184	8	450	94
11	20	579	1.17	0.025 8	0.000 3	0.182 0	0.005 5	0.051 2	0.001 5	164	2	170	5	256	67
12	14	448	0.71	0.026 0	0.000 3	0.176 7	0.005 5	0.049 6	0.001 5	166	2	165	5	176	70
13	13	378	0.87	0.025 8	0.000 3	0.191 1	0.008 7	0.053 8	0.002 4	164	2	178	7	361	100
14	17	520	1.02	0.025 3	0.000 3	0.173 7	0.004 8	0.050 1	0.001 4	161	2	163	4	198	65
15	15	466	0.88	0.025 5	0.000 3	0.172 0	0.004 9	0.049 1	0.001 4	162	2	161	4	154	65
16	12	344	0.92	0.026 2	0.000 4	0.188 7	0.007 6	0.052 0	0.001 9	167	2	176	7	283	83
17	19	508	1.20	0.026 6	0.000 3	0.185 7	0.005 5	0.050 6	0.001 4	169	2	173	5	220	65
18	23	652	1.23	0.025 8	0.000 3	0.176 4	0.004 3	0.049 8	0.001 2	164	2	165	4	183	56
19	20	569	1.06	0.026 4	0.000 3	0.183 2	0.004 9	0.050 3	0.001 2	168	2	171	4	209	56
20	27	738	1.25	0.026 3	0.000 3	0.186 5	0.005 0	0.051 5	0.001 3	167	2	174	4	261	56

测点	w_B/10^-6		Th/U	同位素比值						年龄/Ma
测点	Pb	U	Th/U	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ
1	10	338	0.80	0.026 0	0.000 4	0.184 0	0.006 5	0.052 1	0.001 9	165	2	171	6	300	81
2	22	708	1.02	0.025 5	0.000 3	0.184 7	0.004 9	0.052 6	0.001 4	163	2	172	4	309	58
3	17	571	0.84	0.025 5	0.000 4	0.184 3	0.009 5	0.052 5	0.002 8	162	3	172	8	306	122
4	23	728	1.02	0.026 1	0.000 4	0.197 5	0.007 2	0.055 0	0.002 0	166	3	183	6	413	84
5	20	652	0.91	0.025 8	0.000 3	0.190 0	0.006 3	0.052 9	0.001 5	164	2	177	5	324	65
6	16	549	0.82	0.025 4	0.000 4	0.156 2	0.006 8	0.044 7	0.001 9	161	3	147	6	203	65
7	26	805	1.16	0.026 1	0.000 3	0.185 5	0.005 1	0.051 7	0.001 4	166	2	173	4	333	61
8	18	542	0.90	0.026 0	0.000 4	0.220 5	0.007 1	0.061 8	0.002 0	166	3	202	6	665	75
9	18	529	1.10	0.026 0	0.000 3	0.181 3	0.006 0	0.050 3	0.001 5	166	2	169	5	206	36
10	21	640	0.97	0.025 6	0.000 4	0.198 3	0.009 2	0.055 9	0.002 4	163	3	184	8	450	94
11	20	579	1.17	0.025 8	0.000 3	0.182 0	0.005 5	0.051 2	0.001 5	164	2	170	5	256	67
12	14	448	0.71	0.026 0	0.000 3	0.176 7	0.005 5	0.049 6	0.001 5	166	2	165	5	176	70
13	13	378	0.87	0.025 8	0.000 3	0.191 1	0.008 7	0.053 8	0.002 4	164	2	178	7	361	100
14	17	520	1.02	0.025 3	0.000 3	0.173 7	0.004 8	0.050 1	0.001 4	161	2	163	4	198	65
15	15	466	0.88	0.025 5	0.000 3	0.172 0	0.004 9	0.049 1	0.001 4	162	2	161	4	154	65
16	12	344	0.92	0.026 2	0.000 4	0.188 7	0.007 6	0.052 0	0.001 9	167	2	176	7	283	83
17	19	508	1.20	0.026 6	0.000 3	0.185 7	0.005 5	0.050 6	0.001 4	169	2	173	5	220	65
18	23	652	1.23	0.025 8	0.000 3	0.176 4	0.004 3	0.049 8	0.001 2	164	2	165	4	183	56
19	20	569	1.06	0.026 4	0.000 3	0.183 2	0.004 9	0.050 3	0.001 2	168	2	171	4	209	56
20	27	738	1.25	0.026 3	0.000 3	0.186 5	0.005 0	0.051 5	0.001 3	167	2	174	4	261	56

分析点	年龄/Ma	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	1σ	(¹⁷⁶Hf/¹⁷⁷Hf)_i	ε_Hf(0)	ε_Hf(t)	T_DM/Ma	T_DM ^c/Ma
1	165.3	0.188 79	0.007 30	0.283 09	0.000 03	0.283 07	11.22	14.05	276.4	312.9
2	162.5	0.353 27	0.012 79	0.283 17	0.000 05	0.283 13	14.00	16.19	171.8	172.7
3	162.3	0.225 04	0.008 37	0.283 19	0.000 03	0.283 16	14.76	17.43	108.0	92.6
4	166.2	0.327 25	0.011 58	0.283 16	0.000 05	0.283 12	13.74	16.12	178.4	180.1
5	164.1	0.291 45	0.010 84	0.283 23	0.000 03	0.283 20	16.31	18.74	32.5	9.1
6	161.4	0.240 62	0.008 91	0.283 10	0.000 04	0.283 07	11.52	14.11	276.2	306.1
7	166.0	0.364 32	0.013 33	0.283 14	0.000 04	0.283 10	13.10	15.28	229.5	234.1
9	165.7	0.312 84	0.011 77	0.283 17	0.000 03	0.28313	14.01	16.36	164.6	164.5
10	163.1	0.313 97	0.011 26	0.283 22	0.000 05	0.283 18	15.76	18.13	64.1	48.3
11	164.5	0.309 28	0.011 63	0.283 17	0.000 03	0.283 13	13.94	16.29	167.4	167.8
12	165.6	0.215 71	0.008 27	0.283 11	0.000 03	0.283 09	12.05	14.78	243.6	266.0
13	164.3	0.207 81	0.007 83	0.283 16	0.000 03	0.283 14	13.69	16.45	159.0	157.3
14	161. 1	0.207 68	0.007 90	0.283 12	0.000 03	0.283 10	12.31	15.00	228.1	248.5
15	162.2	0.210 03	0.007 96	0.283 17	0.000 03	0.283 14	13.90	16.61	149.4	145.6
16	166.7	0.237 82	0.008 88	0.283 15	0.000 03	0.283 12	13.32	16.01	183.6	188.1
17	169.5	0.323 59	0.011 63	0.283 22	0.000 05	0.283 19	15.98	18.40	52.2	35.3
18	164.4	0.244 99	0.009 09	0.283 11	0.000 03	0.283 09	12.10	14.72	247.9	269.0
19	167.8	0.336 52	0.012 09	0.283 14	0.000 05	0.283 10	13.11	15.45	218.4	224.6
20	167.1	0.223 47	0.008 20	0.283 06	0.000 04	0.283 03	10.20	12.97	335.4	384.3