Northward Subduction of Subashi Ocean in Eastern Part of the West Kunlun Orogen: Evidence from Early-Middle Permian Volcanic Rocks

doi:10.19657/j.geoscience.1000-8527.2021.034

Abstract

Abstract:

The Karaletash Group in the southern side of the Subashi ophiolite belt is characterized by widespread distribution of felsic and intermediate-felsic volcanic rocks. In this study, we conducted LA-ICP-MS zircon U-Pb geochronology, geochemistry and zircon Lu-Hf isotope analyses on representative rock assemblages of the Karaletash Group. LA-MC-ICP zircon U-Pb dating shows that felsic cystal tuff and basalt were formed from the early-Middle Permian (284.2±1.6 Ma and 262.6±2.0 Ma). The volcanic rocks are rich in Al, Na and Fe, and are enriched in large ion lithophilic elements (LILEs, e.g., K, Rb and Ba) and depleted in high field strength elements (HFSEs, e.g., Sr, Ta, Nb and Ti). Compositions of the mafic volcanic rocks fall into the calc-alkaline-tholeiite field, with chondrite-normalized REE patterns similar to oceanic tholeiite, with Nd/Th = 8.91-13.76 and La/Nb = 0.39-2.28. The zirconε_Hf(t) value are -0.15 to 4.95, which indicates that the mafic volcanic rocks were mainly originated from the mantle with some crust material input. Compositions of the felsic volcanic rocks fall into the calc-alkaline field, with relatively negative anomalies of P and Zr, and with Nd/Th = 1.92-4.10 and La/Nb = 2.52-3.39. The zircon ε_Hf(t) value are 0.94-3.78 and 8.26-12.45, which together with two-staged Hf model ages (1.07-1.25 Ga and 0.51-0.78 Ga), indicating that the felsic volcanic rocks were mainly originated from the re-melting of ancient crust materials and juvenile crust. Geochemical characteristics of the Karaletash Group resemble rocks formed in island arc environment. The Karaletash Group and Subashi ophiolite belt were closely related in their formation ages, the spatial distribution and the geochemical characteristics of the mafic rocks. Combined with deep-water flysch of Liuhuangdaban Formation sandstone in the Subashi ophiolite belt, these rock units constitute the orogenic-trench-arc-basin system. All these indicate that the subduction of the Subashi basin was north-dipping, and that the tectonic background was probably a forearc basin.

Key words: Karaletash group, geochemistry, zircon U-Pb dating, zircon Lu-Hf isotopes, Subashi ophiolite belt, west Kunlun Orogen

CLC Number:

P588.14

ZHANG Yu, TANG Mingying, CUI Xiaofeng, HE Yuliang, DONG Weidong. Northward Subduction of Subashi Ocean in Eastern Part of the West Kunlun Orogen: Evidence from Early-Middle Permian Volcanic Rocks[J]. Geoscience, 2021, 35(03): 763-775.

Figures/Tables 11

References 33

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样品号 (岩性)	点号	含量/10^-6		Th/U	同位素比值			年龄/Ma
样品号 (岩性)	点号	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ	²⁰⁷Pb/ ²⁰⁶Pb	²⁰⁷Pb/ ²³⁵U	²⁰⁶Pb/ ²³⁸U
3706-U-Pb01 (酸性晶屑凝灰岩)	1	211	382	0.55	0.047±0.002	0.292±0.015	0.045±0.000 6	47	260	284
	2	113	151	0.74	0.052±0.004	0.321±0.022	0.045±0.000 7	264	283	285
	4	91	185	0.49	0.053±0.005	0.330±0.030	0.045±0.001 0	325	289	285
	6	381	2 149	0.18	0.055±0.002	0.339±0.010	0.045±0.000 4	404	297	283
	8	286	689	0.42	0.055±0.002	0.341±0.011	0.045±0.000 4	414	298	283
	9	376	889	0.42	0.055±0.001	0.342±0.006	0.045±0.000 3	416	299	284
	10	222	797	0.28	0.053±0.002	0.331±0.009	0.045±0.000 4	342	290	284
	11	193	599	0.32	0.057±0.002	0.352±0.011	0.045±0.000 4	479	306	284
	12	328	714	0.46	0.054±0.003	0.336±0.016	0.045±0.000 6	360	294	286
	13	146	573	0.25	0.056±0.002	0.345±0.013	0.045±0.000 5	440	301	284
	14	132	277	0.48	0.052±0.003	0.322±0.016	0.045±0.000 6	271	283	285
	19	157	711	0.22	0.055±0.003	0.343±0.019	0.045±0.000 7	415	300	285
	20	112	430	0.26	0.057±0.003	0.355±0.018	0.045±0.000 6	495	309	284
	21	81	337	0.24	0.053±0.002	0.331±0.015	0.045±0.000 6	334	290	285
	23	162	1 336	0.12	0.054±0.002	0.337±0.012	0.045±0.000 5	380	295	285
PM012-U-Pb22 (蚀变玄武岩)	1	387	361	1.07	0.048±0.001	0.277±0.007	0.042±0.000 3	102	248	264
	3	90	139	0.65	0.055±0.003	0.310±0.019	0.041±0.000 5	395	274	261
	4	96	142	0.68	0.054±0.004	0.304±0.020	0.041±0.000 5	351	270	260
	6	56	95	0.59	0.055±0.003	0.316±0.018	0.041±0.000 5	426	279	262
	7	66	116	0.57	0.046±0.006	0.264±0.036	0.041±0.001 2	17	238	261
	8	95	136	0.69	0.051±0.002	0.293±0.013	0.042±0.000 4	248	261	263
	10	77	134	0.57	0.047±0.003	0.271±0.017	0.042±0.000 5	47	243	264
	12	65	120	0.54	0.050±0.004	0.288±0.024	0.042±0.000 8	196	257	264
	16	33	64	0.51	0.049±0.005	0.282±0.027	0.042±0.000 8	149	252	263
	18	92	132	0.69	0.052±0.004	0.298±0.020	0.041±0.000 6	296	265	262

样品号 (岩性)	点号	含量/10^-6		Th/U	同位素比值			年龄/Ma
样品号 (岩性)	点号	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ	²⁰⁷Pb/ ²⁰⁶Pb	²⁰⁷Pb/ ²³⁵U	²⁰⁶Pb/ ²³⁸U
3706-U-Pb01 (酸性晶屑凝灰岩)	1	211	382	0.55	0.047±0.002	0.292±0.015	0.045±0.000 6	47	260	284
	2	113	151	0.74	0.052±0.004	0.321±0.022	0.045±0.000 7	264	283	285
	4	91	185	0.49	0.053±0.005	0.330±0.030	0.045±0.001 0	325	289	285
	6	381	2 149	0.18	0.055±0.002	0.339±0.010	0.045±0.000 4	404	297	283
	8	286	689	0.42	0.055±0.002	0.341±0.011	0.045±0.000 4	414	298	283
	9	376	889	0.42	0.055±0.001	0.342±0.006	0.045±0.000 3	416	299	284
	10	222	797	0.28	0.053±0.002	0.331±0.009	0.045±0.000 4	342	290	284
	11	193	599	0.32	0.057±0.002	0.352±0.011	0.045±0.000 4	479	306	284
	12	328	714	0.46	0.054±0.003	0.336±0.016	0.045±0.000 6	360	294	286
	13	146	573	0.25	0.056±0.002	0.345±0.013	0.045±0.000 5	440	301	284
	14	132	277	0.48	0.052±0.003	0.322±0.016	0.045±0.000 6	271	283	285
	19	157	711	0.22	0.055±0.003	0.343±0.019	0.045±0.000 7	415	300	285
	20	112	430	0.26	0.057±0.003	0.355±0.018	0.045±0.000 6	495	309	284
	21	81	337	0.24	0.053±0.002	0.331±0.015	0.045±0.000 6	334	290	285
	23	162	1 336	0.12	0.054±0.002	0.337±0.012	0.045±0.000 5	380	295	285
PM012-U-Pb22 (蚀变玄武岩)	1	387	361	1.07	0.048±0.001	0.277±0.007	0.042±0.000 3	102	248	264
	3	90	139	0.65	0.055±0.003	0.310±0.019	0.041±0.000 5	395	274	261
	4	96	142	0.68	0.054±0.004	0.304±0.020	0.041±0.000 5	351	270	260
	6	56	95	0.59	0.055±0.003	0.316±0.018	0.041±0.000 5	426	279	262
	7	66	116	0.57	0.046±0.006	0.264±0.036	0.041±0.001 2	17	238	261
	8	95	136	0.69	0.051±0.002	0.293±0.013	0.042±0.000 4	248	261	263
	10	77	134	0.57	0.047±0.003	0.271±0.017	0.042±0.000 5	47	243	264
	12	65	120	0.54	0.050±0.004	0.288±0.024	0.042±0.000 8	196	257	264
	16	33	64	0.51	0.049±0.005	0.282±0.027	0.042±0.000 8	149	252	263
	18	92	132	0.69	0.052±0.004	0.298±0.020	0.041±0.000 6	296	265	262

样品号	SiO₂		Al₂O₃		TFe₂O₃	FeO	MgO		CaO		Na₂O			K₂O		MnO		TiO₂		P₂O₅		烧失量
3706-WXG01	66.77		13.90		2.10	1.42	1.28		4.38		3.94			1.90		0.08		0.30		0.02		5.24
3707-WXG01	45.64		16.16		10.68	6.78	7.33		8.69		3.34			0.56		0.24		1.40		0.09		5.78
PM012-WXG22	51.45		15.14		12.96	6.21	3.54		3.60		6.13			0.24		0.14		2.93		0.47		3.34
^#D137/1	67.21		12.20		0.45	3.83	1.46		5.58		3.04			2.29		0.08		0.32		0.22		3.27
^#D138/3	62.75		14.73		1.00	5.69	3.44		3.94		3.05			1.96		0.26		0.64		0.20		1.95
^#D140/1	39.19		16.20		8.32	1.76	2.79		15.80		2.68			11.30		0.16		1.26		0.24		11.30
^#D139/1	46.55		13.53		5.76	6.23	7.07		11.10		3.02			3.84		0.18		1.54		0.28		3.84
^#D138/1	48.87		14.92		2.74	7.51	7.54		10.10		2.71			2.72		0.28		1.30		0.22		2.72
样品号	总量		σ		Mg#	AR	A/CNK		DI		SI			Na₂O/K₂O		Sc		V		Cr		Co
3706-WXG01	101.33		1.43		0.41	2.52	0.84		73.59		12.08			2.07		0.35		28.20		23.20		2.52
3707-WXG01	106.69		5.75		0.44	1.37	0.74		30.21		25.98			5.94		29.40		518.00		432.00		40.50
PM012-WXG22	106.15		4.79		0.26	4.79	0.90		52.09		12.39			25.94		21.70		346.00		4.67		32.50
^#D137/1	99.90		1.17		0.38	1.85	0.71		*		13.19			1.33		6.37		*		161.10		5.10
^#D138/3	99.60		1.27		0.48	1.73	1.08		*		22.72			1.56		15.74		*		119.50		22.74
^#D140/1	100.00		4.20		0.35	1.33	0.47		*		10.39			0.24		27.82		*		266.60		36.50
^#D139/1	99.90		4.11		0.53	1.37	0.55		*		27.27			0.79		39.36		*		213.30		46.07
^#D138/1	99.80		2.20		0.57	1.34	0.66		*		32.47			1.00		29.38		*		303.60		27.48
样品号	Ni		Ba		Hf	Ta	W		Tl		Rb			Sr		Zr		Nb		Th		U
3706-WXG01	10.40		436.00		4.20	0.54	0.71		0.51		63.50			210.00		87.70		5.98		7.81		2.25
3707-WXG01	72.10		211.00		3.39	0.15	0.45		0.11		10.70			140.00		132.00		1.58		0.37		0.17
PM012-WXG22	6.20		118.00		12.00	1.01	0.54		0.18		4.84			55.20		517.00		10.30		3.95		1.30
^#D137/1	29.12		115.50		2.96	0.18	*		*		103.90			202.10		84.42		15.60		9.35		*
^#D138/3	66.38		127.90		3.30	1.01	*		*		72.31			155.80		99.05		17.44		11.20		*
^#D140/1	118.60		37.02		2.43	0.10	*		*		54.76			135.70		86.92		15.21		0.95		*
^#D139/1	95.74		41.26		1.66	0.39	*		*		24.53			257.30		42.85		15.99		2.01		*
^#D138/1	81.55		52.99		0.86	0.31	*		*		45.38			378.00		20.49		8.69		1.55		*
样品号	Cs		La		Ce	Pr	Nd		Sm		Eu			Gd		Tb		Dy		Ho		Er
3706-WXG01	2.53		20.30		36.30	4.25	15.00		2.74		0.71			2.51		0.38		2.10		0.42		1.37
3707-WXG01	0.47		3.61		9.89	1.68	8.98		3.19		1.20			3.41		0.70		5.13		1.08		3.17
PM012-WXG22	0.47		19.70		49.50	7.55	35.20		10.20		2.76			9.62		2.00		12.40		2.54		7.47
^#D137/1	*		40.98		79.18	8.29	29.45		6.05		1.23			6.16		0.82		4.45		0.85		2.84
^#D138/3	*		43.99		92.75	10.80	46.00		8.10		1.67			8.27		1.26		7.28		1.39		4.07
^#D140/1	*		5.96		11.64	2.65	11.70		2.88		0.98			3.40		0.68		4.59		0.97		2.91
^#D139/1	*		9.71		24.07	2.52	18.50		5.41		1.74			6.52		1.30		8.71		1.75		4.98
^#D138/1	*		8.31		18.43	4.59	21.28		4.04		1.20			4.76		0.90		6.02		1.28		3.63
样品号	Tm	Yb		Lu		Y		REE		LREE		HREE	LREE/ HREE		δEu		(La/Sm)_N		(La/Yb)_N		(Gd/Yb)_N
3706-WXG01	0.19	1.38		0.20		12.60		87.85		79.30		8.55	9.27		0.81		4.66		9.92		1.47
3707-WXG01	0.46	3.07		0.44		29.70		46.01		28.55		17.46	1.64		1.11		0.71		0.79		0.90
PM012-WXG22	1.02	7.03		1.00		69.20		167.99		124.91		43.08	2.90		0.84		1.21		1.89		1.10
^#D137/1	0.36	2.58		0.37		21.80		183.61		165.18		18.43	8.96		0.61		4.26		10.71		1.93
^#D138/3	0.58	3.71		0.53		25.60		230.40		203.31		27.09	7.50		0.62		3.42		7.99		1.80
^#D140/1	0.41	2.75		0.41		20.90		51.93		35.81		16.12	2.22		0.96		1.30		1.46		1.00
^#D139/1	0.72	4.42		0.59		30.20		90.94		61.95		28.99	2.14		0.89		1.13		1.48		1.19
^#D138/1	0.52	3.19		0.41		35.90		78.56		57.85		20.71	2.79		0.84		1.29		1.76		1.20

样品号	SiO₂		Al₂O₃		TFe₂O₃	FeO	MgO		CaO		Na₂O			K₂O		MnO		TiO₂		P₂O₅		烧失量
3706-WXG01	66.77		13.90		2.10	1.42	1.28		4.38		3.94			1.90		0.08		0.30		0.02		5.24
3707-WXG01	45.64		16.16		10.68	6.78	7.33		8.69		3.34			0.56		0.24		1.40		0.09		5.78
PM012-WXG22	51.45		15.14		12.96	6.21	3.54		3.60		6.13			0.24		0.14		2.93		0.47		3.34
^#D137/1	67.21		12.20		0.45	3.83	1.46		5.58		3.04			2.29		0.08		0.32		0.22		3.27
^#D138/3	62.75		14.73		1.00	5.69	3.44		3.94		3.05			1.96		0.26		0.64		0.20		1.95
^#D140/1	39.19		16.20		8.32	1.76	2.79		15.80		2.68			11.30		0.16		1.26		0.24		11.30
^#D139/1	46.55		13.53		5.76	6.23	7.07		11.10		3.02			3.84		0.18		1.54		0.28		3.84
^#D138/1	48.87		14.92		2.74	7.51	7.54		10.10		2.71			2.72		0.28		1.30		0.22		2.72
样品号	总量		σ		Mg#	AR	A/CNK		DI		SI			Na₂O/K₂O		Sc		V		Cr		Co
3706-WXG01	101.33		1.43		0.41	2.52	0.84		73.59		12.08			2.07		0.35		28.20		23.20		2.52
3707-WXG01	106.69		5.75		0.44	1.37	0.74		30.21		25.98			5.94		29.40		518.00		432.00		40.50
PM012-WXG22	106.15		4.79		0.26	4.79	0.90		52.09		12.39			25.94		21.70		346.00		4.67		32.50
^#D137/1	99.90		1.17		0.38	1.85	0.71		*		13.19			1.33		6.37		*		161.10		5.10
^#D138/3	99.60		1.27		0.48	1.73	1.08		*		22.72			1.56		15.74		*		119.50		22.74
^#D140/1	100.00		4.20		0.35	1.33	0.47		*		10.39			0.24		27.82		*		266.60		36.50
^#D139/1	99.90		4.11		0.53	1.37	0.55		*		27.27			0.79		39.36		*		213.30		46.07
^#D138/1	99.80		2.20		0.57	1.34	0.66		*		32.47			1.00		29.38		*		303.60		27.48
样品号	Ni		Ba		Hf	Ta	W		Tl		Rb			Sr		Zr		Nb		Th		U
3706-WXG01	10.40		436.00		4.20	0.54	0.71		0.51		63.50			210.00		87.70		5.98		7.81		2.25
3707-WXG01	72.10		211.00		3.39	0.15	0.45		0.11		10.70			140.00		132.00		1.58		0.37		0.17
PM012-WXG22	6.20		118.00		12.00	1.01	0.54		0.18		4.84			55.20		517.00		10.30		3.95		1.30
^#D137/1	29.12		115.50		2.96	0.18	*		*		103.90			202.10		84.42		15.60		9.35		*
^#D138/3	66.38		127.90		3.30	1.01	*		*		72.31			155.80		99.05		17.44		11.20		*
^#D140/1	118.60		37.02		2.43	0.10	*		*		54.76			135.70		86.92		15.21		0.95		*
^#D139/1	95.74		41.26		1.66	0.39	*		*		24.53			257.30		42.85		15.99		2.01		*
^#D138/1	81.55		52.99		0.86	0.31	*		*		45.38			378.00		20.49		8.69		1.55		*
样品号	Cs		La		Ce	Pr	Nd		Sm		Eu			Gd		Tb		Dy		Ho		Er
3706-WXG01	2.53		20.30		36.30	4.25	15.00		2.74		0.71			2.51		0.38		2.10		0.42		1.37
3707-WXG01	0.47		3.61		9.89	1.68	8.98		3.19		1.20			3.41		0.70		5.13		1.08		3.17
PM012-WXG22	0.47		19.70		49.50	7.55	35.20		10.20		2.76			9.62		2.00		12.40		2.54		7.47
^#D137/1	*		40.98		79.18	8.29	29.45		6.05		1.23			6.16		0.82		4.45		0.85		2.84
^#D138/3	*		43.99		92.75	10.80	46.00		8.10		1.67			8.27		1.26		7.28		1.39		4.07
^#D140/1	*		5.96		11.64	2.65	11.70		2.88		0.98			3.40		0.68		4.59		0.97		2.91
^#D139/1	*		9.71		24.07	2.52	18.50		5.41		1.74			6.52		1.30		8.71		1.75		4.98
^#D138/1	*		8.31		18.43	4.59	21.28		4.04		1.20			4.76		0.90		6.02		1.28		3.63
样品号	Tm	Yb		Lu		Y		REE		LREE		HREE	LREE/ HREE		δEu		(La/Sm)_N		(La/Yb)_N		(Gd/Yb)_N
3706-WXG01	0.19	1.38		0.20		12.60		87.85		79.30		8.55	9.27		0.81		4.66		9.92		1.47
3707-WXG01	0.46	3.07		0.44		29.70		46.01		28.55		17.46	1.64		1.11		0.71		0.79		0.90
PM012-WXG22	1.02	7.03		1.00		69.20		167.99		124.91		43.08	2.90		0.84		1.21		1.89		1.10
^#D137/1	0.36	2.58		0.37		21.80		183.61		165.18		18.43	8.96		0.61		4.26		10.71		1.93
^#D138/3	0.58	3.71		0.53		25.60		230.40		203.31		27.09	7.50		0.62		3.42		7.99		1.80
^#D140/1	0.41	2.75		0.41		20.90		51.93		35.81		16.12	2.22		0.96		1.30		1.46		1.00
^#D139/1	0.72	4.42		0.59		30.20		90.94		61.95		28.99	2.14		0.89		1.13		1.48		1.19
^#D138/1	0.52	3.19		0.41		35.90		78.56		57.85		20.71	2.79		0.84		1.29		1.76		1.20

样号	点号	¹⁷⁶Lu/¹⁷⁷Hf±1σ	¹⁷⁶Yb/¹⁷⁷Hf±1σ	¹⁷⁶Hf/¹⁷⁷Hf±1σ	Hf_i	ε_Hf(t)±1σ	t_DM/Ga	t_DM2/Ga	t/Ma
PM012- U-Pb22	1	0.005 700±0.000 144	0.186 482±0.003 267	0.282 859±0.000 042	0.282 635	0.97±0.46	0.87	1.23	264
	3	0.002 616±0.000 061	0.084 061±0.002 997	0.282 850±0.000 040	0.282 699	3.14±0.47	0.77	1.09	261
	4	0.003 366±0.000 121	0.108 388±0.003 162	0.282 965±0.000 038	0.282 699	3.14±0.47	0.77	1.09	260
	6	0.003 393±0.000 028	0.114 835±0.001 699	0.282 877±0.000 040	0.282 466	-5.07±0.41	1.10	1.61	262
	7	0.003 356±0.000 100	0.111 448±0.002 593	0.282 894±0.000 047	0.282 671	2.16±0.46	0.82	1.15	261
	10	0.003 859±0.000 057	0.132 344±0.003 999	0.282 895±0.000 044	0.282 748	4.95±0.49	0.71	0.98	264
	12	0.001 437±0.000 037	0.047 473±0.001 025	0.282 911±0.000 019	0.282 708	3.54±0.43	0.76	1.07	264
	16	0.001 011±0.000 031	0.034 068±0.001 153	0.282 936±0.000 019	0.282 604	-0.15±0.50	0.91	1.30	263
	18	0.004 979±0.000 081	0.155 917±0.002 541	0.282 728±0.000 104	0.282 686	2.72±0.51	0.80	1.12	262
3706- U-Pb01	1	0.001 204±0.000 007	0.038 580±0.000 396	0.282 641±0.000 013	0.282 633	1.33±0.56	0.87	1.22	284
	2	0.000 620±0.000 023	0.018 640±0.000 629	0.282 702±0.000 014	0.282 669	2.60±0.61	0.83	1.14	285
	4	0.000 433±0.000 006	0.013 031±0.000 227	0.282 701±0.000 013	0.282 622	0.94±0.63	0.88	1.25	285
	6	0.000 696±0.000 005	0.021 798±0.000 112	0.282 469±0.000 012	0.282 644	1.69±0.61	0.86	1.20	283
	8	0.002 774±0.000 070	0.092 411±0.001 171	0.282 940±0.000 029	0.282 377	-7.76±0.59	1.23	1.80	283
	9	0.001 133±0.000 036	0.034 207±0.001 102	0.282 677±0.000 013	0.282 829	8.26±1.46	0.64	0.78	284
	10	0.001 494±0.000 051	0.041 647±0.001 687	0.282 755±0.000 014	0.282 836	8.49±1.41	0.60	0.77	284
	11	0.000 922±0.000 023	0.026 243±0.000 537	0.282 713±0.000 012	0.282 947	12.45±1.33	0.43	0.51	284
	12	0.001 084±0.000 040	0.032 054±0.001 004	0.282 610±0.000 014	0.282 859	9.36±1.42	0.57	0.71	286
	13	0.001 007±0.000 019	0.030 552±0.000 495	0.282 691±0.000 015	0.282 877	9.94±1.66	0.54	0.67	284
	14	0.000 838±0.000 027	0.026 433±0.000 877	0.282 638±0.000 016	0.282 925	11.67±1.03	0.46	0.56	285
	19	0.001 658±0.000 032	0.048 565±0.000 763	0.282 677±0.000 017	0.282 875	9.89±1.54	0.55	0.68	285
	20	0.000 873±0.000 019	0.025 403±0.000 414	0.282 626±0.000 018	0.282 903	10.88±0.66	0.49	0.61	284
	21	0.001 080±0.000 014	0.032 663±0.000 554	0.282 650±0.000 017	0.282 931	11.88±0.65	0.45	0.55	285
	23	0.000 861±0.000 054	0.025 701±0.002 011	0.282 381±0.000 017	0.282 702	3.78±3.63	0.83	1.07	285