Zircon U-Pb dating and trace element geochemistry in syenite porphyry and granite xenoliths from Liuhe, western Yunnan, China

doi:10.13745/j.esf.sf.2020.4.44

Abstract

Abstract:

The Liuhe syenite porphyry is a typical representative of the Cenozoic alkali-rich porphyry in western Yunnan. It is famous for various xenoliths developed at different depths, including granite xenoliths of the same period. The deep geological processes represented by these xenoliths have important constraints on the formation and evolution of alkali-rich magma. In this paper, we focused on zircon trace element analyses, and combined with the studies on syenite porphyry main elements, zircon U-Pb dating, Ti thermometer and zircon oxygen fugacity of the Liuhe syenite porphyry and its granite xenoliths to explore the formation and evolution process of alkali-rich magma. The zircon U-Pb dating results suggested that the activity time of Liuhe alkali-rich magma is 37.89±0.96 to 35.87±0.58 Ma, almost synchronous with that of granite inclusions representing the same period of silicon-rich acidic magma at 38.21±0.44 to 36.21±0.36 Ma. The zircon trace element diagram showed that zircons from syenite porphyry mainly overlapped with the potassium-magnesium lamprophyre range, suggesting that alkali-rich magma source has mantle properties; whereas zircons from granite xenoliths overlapped in part with the granite range. The overlapping part confirmed a common growth environment during syenite porphyry and granite xenoliths zircon crystallization. The estimated Ce^(Ⅳ)/Ce^(Ⅲ) ratio and Ti temperature calculations showed that oxygen fugacity of the alkali-rich magma and zircon crystallization temperature changed greatly between 36.42 and 36.41 Ma, indicating the effect of mixing alkali-rich and entrapped granitic magma; while decreasing oxygen fugacity oscillation reflects magma supplement from a later mantle source. In summary, we speculate that the Himalayan alkali-rich magma from enriched mantle source in the Liuhe area underplates and melts the overlying felsic rocks to form granitic magma, and a small amount of which mix with alkali-rich magma to form syenite porphyry.

Key words: syenite porphyry from Liuhe, zircon U-Pb dating, trace element geochemistry, crust-mantle magma mixing, deep geological process

CLC Number:

DUAN Wenjing, ZHAO Fufeng, REN Kefa, LIU Xianfan, DENG Jianghong, YANG Mimi, CHU Yating. Zircon U-Pb dating and trace element geochemistry in syenite porphyry and granite xenoliths from Liuhe, western Yunnan, China[J]. Earth Science Frontiers, 2020, 27(3): 154-167.

Figures/Tables 13

References 57

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序号	编号	岩石名称	w_B/%																	K₂O/ Na₂O	Mg^#
序号	编号	岩石名称	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	SO₃	H₂O^+/-	Loss	总量	Na₂O+ K₂O	TFeO	K₂O/ Na₂O	Mg^#
1	LH08	正长斑岩	61.30	0.74	14.44	5.16	2.17	0.09	2.69	4.04	3.71	6.40	0.44	0.01	1.11	0.92	101.38	10.11	6.81	1.73	0.69
2	HL-81	正长斑岩	58.00	0.62	16.40	2.59	2.01	0.10	2.20	4.50	3.53	5.30	0.37			1.77	97.40	8.83	4.34	1.50	0.66
3	LH13	花岗岩包体	72.00	0.11	15.44	1.67	1.00	0.03	0.29	1.06	5.87	2.99	0.04	<0.01	0.72	0.38	100.84	8.86	2.50	0.51	0.34
4	LH14	花岗岩包体	70.78	0.08	15.66	1.26	0.65	0.02	0.18	0.92	5.50	4.32	0.02	<0.01	0.54	0.32	99.61	9.82	1.78	0.79	0.33

序号	编号	岩石名称	w_B/%																	K₂O/ Na₂O	Mg^#
序号	编号	岩石名称	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	SO₃	H₂O^+/-	Loss	总量	Na₂O+ K₂O	TFeO	K₂O/ Na₂O	Mg^#
1	LH08	正长斑岩	61.30	0.74	14.44	5.16	2.17	0.09	2.69	4.04	3.71	6.40	0.44	0.01	1.11	0.92	101.38	10.11	6.81	1.73	0.69
2	HL-81	正长斑岩	58.00	0.62	16.40	2.59	2.01	0.10	2.20	4.50	3.53	5.30	0.37			1.77	97.40	8.83	4.34	1.50	0.66
3	LH13	花岗岩包体	72.00	0.11	15.44	1.67	1.00	0.03	0.29	1.06	5.87	2.99	0.04	<0.01	0.72	0.38	100.84	8.86	2.50	0.51	0.34
4	LH14	花岗岩包体	70.78	0.08	15.66	1.26	0.65	0.02	0.18	0.92	5.50	4.32	0.02	<0.01	0.54	0.32	99.61	9.82	1.78	0.79	0.33

测点	w_B/10^-6		Th/U	同位素比值				年龄/Ma		测点		w_B/10^-6				Th/U		同位素比值								年龄/Ma
测点	Th	U	Th/U	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	测点		Th		U		Th/U		²⁰⁷Pb/ ²³⁵U		1σ		²⁰⁶Pb/ ²³⁸U		1σ		²⁰⁶Pb/ ²³⁸U		1σ
Z1	3.66	222.5	0.02	0.032 2	0.003 8	0.005 3	0.000 2	34.23	1.22	B1	2 621.30		12 066.87		0.22		0.037 2		0.001 1		0.005 3		0.000 1		33.81		0.32
Z2	21.85	87.14	0.25	0.034 4	0.004 7	0.005 3	0.000 2	34.23	1.48	B1	2 621.30		12 066.87		0.22		0.037 2		0.001 1		0.005 3		0.000 1		33.81		0.32
Z2	21.85	87.14	0.25	0.034 4	0.004 7	0.005 3	0.000 2	34.23	1.48	B2	189.51		2 585.99		0.07		0.038 1		0.001 7		0.005 5		0.000 1		35.23		0.42
Z3	3.64	207.13	0.02	0.034 3	0.003 5	0.005 3	0.000 2	34.29	1	B2	189.51		2 585.99		0.07		0.038 1		0.001 7		0.005 5		0.000 1		35.23		0.42
Z3	3.64	207.13	0.02	0.034 3	0.003 5	0.005 3	0.000 2	34.29	1	B3	0.22		40.74		0.01		0.036 1		0.004 4		0.005 5		0.000 3		35.45		1.98
Z4	1 469.58	806.09	1.82	0.035 6	0.002 3	0.005 5	0.000 1	35.63	0.63	B3	0.22		40.74		0.01		0.036 1		0.004 4		0.005 5		0.000 3		35.45		1.98
Z4	1 469.58	806.09	1.82	0.035 6	0.002 3	0.005 5	0.000 1	35.63	0.63	B4	12.21		277.81		0.04		0.036 0		0.003 9		0.005 6		0.000 2		35.86		1.01
Z5	0.24	151.14	0.002	0.036 1	0.004 6	0.005 6	0.000 2	35.69	1.14	B4	12.21		277.81		0.04		0.036 0		0.003 9		0.005 6		0.000 2		35.86		1.01
Z5	0.24	151.14	0.002	0.036 1	0.004 6	0.005 6	0.000 2	35.69	1.14	B5	2.08		164.93		0.01		0.037 3		0.004 8		0.005 6		0.000 2		35.98		1.2
Z6	47.1	334.28	0.14	0.039 5	0.004 3	0.005 6	0.000 2	35.8	1.02	B5	2.08		164.93		0.01		0.037 3		0.004 8		0.005 6		0.000 2		35.98		1.2
Z7	43.24	318.83	0.14	0.033 9	0.003 6	0.005 7	0.000 2	36.42	1.06	B6	2 836.12		1 463.09		1.94		0.036 5		0.002 0		0.005 6		0.000 1		36.14		0.56
Z8	0.41	42.25	0.01	0.040 0	0.007 2	0.005 7	0.000 3	36.45	1.82	B6	2 836.12		1 463.09		1.94		0.036 5		0.002 0		0.005 6		0.000 1		36.14		0.56
Z8	0.41	42.25	0.01	0.040 0	0.007 2	0.005 7	0.000 3	36.45	1.82	B7	1 238.36		3 418.96		0.36		0.036 9		0.002 3		0.005 6		0.000 1		36.18		0.42
Z9	28.43	65.4	0.43	0.030 8	0.010 8	0.005 7	0.000 3	36.47	1.98	B7	1 238.36		3 418.96		0.36		0.036 9		0.002 3		0.005 6		0.000 1		36.18		0.42
Z9	28.43	65.4	0.43	0.030 8	0.010 8	0.005 7	0.000 3	36.47	1.98	B8	1 636.78		7 033.89		0.23		0.037 3		0.002 8		0.005 7		0.000 1		36.41		0.64
Z10	29.43	228.85	0.13	0.037 7	0.004 2	0.005 7	0.000 2	36.56	1.21	B8	1 636.78		7 033.89		0.23		0.037 3		0.002 8		0.005 7		0.000 1		36.41		0.64
Z10	29.43	228.85	0.13	0.037 7	0.004 2	0.005 7	0.000 2	36.56	1.21	B9	3 254.38		2 303.91		1.41		0.040 6		0.001 8		0.005 7		0.000 1		36.71		0.42
Z11	63.48	638.7	0.1	0.038 3	0.002 7	0.005 7	0.000 1	36.81	0.67	B9	3 254.38		2 303.91		1.41		0.040 6		0.001 8		0.005 7		0.000 1		36.71		0.42
Z11	63.48	638.7	0.1	0.038 3	0.002 7	0.005 7	0.000 1	36.81	0.67	B10	1.64		149.96		0.01		0.036 9		0.004 3		0.005 7		0.000 2		36.85		1.09
Z12	23.14	336.21	0.07	0.038 7	0.003 9	0.005 7	0.000 2	36.91	1.09	B10	1.64		149.96		0.01		0.036 9		0.004 3		0.005 7		0.000 2		36.85		1.09
Z13	13.3	304.18	0.04	0.039 1	0.003 6	0.005 8	0.000 1	37.04	0.89	B11	1 068.41		1 107.51		0.96		0.036 8		0.002 0		0.005 7		0.000 1		36.93		0.49
Z14	2.31	97.93	0.02	0.045 6	0.010 2	0.005 8	0.000 3	37.56	1.69	B11	1 068.41		1 107.51		0.96		0.036 8		0.002 0		0.005 7		0.000 1		36.93		0.49
Z14	2.31	97.93	0.02	0.045 6	0.010 2	0.005 8	0.000 3	37.56	1.69	B12	1 328.96		985.51		1.35		0.038 9		0.002 6		0.005 9		0.000 1		37.63		0.62
Z15	13.47	231.1	0.06	0.041 1	0.006 1	0.005 9	0.000 2	38.17	1.25	B12	1 328.96		985.51		1.35		0.038 9		0.002 6		0.005 9		0.000 1		37.63		0.62
Z15	13.47	231.1	0.06	0.041 1	0.006 1	0.005 9	0.000 2	38.17	1.25	B13	57.28		2 433.86		0.02		0.038 1		0.002 1		0.005 9		0.000 1		37.81		0.47
Z16	29.35	215.53	0.14	0.039 9	0.008 8	0.005 9	0.000 2	38.19	1.24	B13	57.28		2 433.86		0.02		0.038 1		0.002 1		0.005 9		0.000 1		37.81		0.47
Z16	29.35	215.53	0.14	0.039 9	0.008 8	0.005 9	0.000 2	38.19	1.24	B14	2 500.34		2 186.49		1.14		0.042 1		0.001 8		0.006 0		0.000 1		38.28		0.44
Z17	7	67.46	0.1	0.040 4	0.005 4	0.006 0	0.000 3	38.39	1.73	B14	2 500.34		2 186.49		1.14		0.042 1		0.001 8		0.006 0		0.000 1		38.28		0.44
Z17	7	67.46	0.1	0.040 4	0.005 4	0.006 0	0.000 3	38.39	1.73	B15	156.49		1 432.92		0.11		0.044 7		0.001 5		0.006 0		0.000 1		38.58		0.36
Z18	4.01	304	0.01	0.037 6	0.004 0	0.006 0	0.000 2	38.61	1.06	B15	156.49		1 432.92		0.11		0.044 7		0.001 5		0.006 0		0.000 1		38.58		0.36

测点	w_B/10^-6		Th/U	同位素比值				年龄/Ma		测点		w_B/10^-6				Th/U		同位素比值								年龄/Ma
测点	Th	U	Th/U	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	测点		Th		U		Th/U		²⁰⁷Pb/ ²³⁵U		1σ		²⁰⁶Pb/ ²³⁸U		1σ		²⁰⁶Pb/ ²³⁸U		1σ
Z1	3.66	222.5	0.02	0.032 2	0.003 8	0.005 3	0.000 2	34.23	1.22	B1	2 621.30		12 066.87		0.22		0.037 2		0.001 1		0.005 3		0.000 1		33.81		0.32
Z2	21.85	87.14	0.25	0.034 4	0.004 7	0.005 3	0.000 2	34.23	1.48	B1	2 621.30		12 066.87		0.22		0.037 2		0.001 1		0.005 3		0.000 1		33.81		0.32
Z2	21.85	87.14	0.25	0.034 4	0.004 7	0.005 3	0.000 2	34.23	1.48	B2	189.51		2 585.99		0.07		0.038 1		0.001 7		0.005 5		0.000 1		35.23		0.42
Z3	3.64	207.13	0.02	0.034 3	0.003 5	0.005 3	0.000 2	34.29	1	B2	189.51		2 585.99		0.07		0.038 1		0.001 7		0.005 5		0.000 1		35.23		0.42
Z3	3.64	207.13	0.02	0.034 3	0.003 5	0.005 3	0.000 2	34.29	1	B3	0.22		40.74		0.01		0.036 1		0.004 4		0.005 5		0.000 3		35.45		1.98
Z4	1 469.58	806.09	1.82	0.035 6	0.002 3	0.005 5	0.000 1	35.63	0.63	B3	0.22		40.74		0.01		0.036 1		0.004 4		0.005 5		0.000 3		35.45		1.98
Z4	1 469.58	806.09	1.82	0.035 6	0.002 3	0.005 5	0.000 1	35.63	0.63	B4	12.21		277.81		0.04		0.036 0		0.003 9		0.005 6		0.000 2		35.86		1.01
Z5	0.24	151.14	0.002	0.036 1	0.004 6	0.005 6	0.000 2	35.69	1.14	B4	12.21		277.81		0.04		0.036 0		0.003 9		0.005 6		0.000 2		35.86		1.01
Z5	0.24	151.14	0.002	0.036 1	0.004 6	0.005 6	0.000 2	35.69	1.14	B5	2.08		164.93		0.01		0.037 3		0.004 8		0.005 6		0.000 2		35.98		1.2
Z6	47.1	334.28	0.14	0.039 5	0.004 3	0.005 6	0.000 2	35.8	1.02	B5	2.08		164.93		0.01		0.037 3		0.004 8		0.005 6		0.000 2		35.98		1.2
Z7	43.24	318.83	0.14	0.033 9	0.003 6	0.005 7	0.000 2	36.42	1.06	B6	2 836.12		1 463.09		1.94		0.036 5		0.002 0		0.005 6		0.000 1		36.14		0.56
Z8	0.41	42.25	0.01	0.040 0	0.007 2	0.005 7	0.000 3	36.45	1.82	B6	2 836.12		1 463.09		1.94		0.036 5		0.002 0		0.005 6		0.000 1		36.14		0.56
Z8	0.41	42.25	0.01	0.040 0	0.007 2	0.005 7	0.000 3	36.45	1.82	B7	1 238.36		3 418.96		0.36		0.036 9		0.002 3		0.005 6		0.000 1		36.18		0.42
Z9	28.43	65.4	0.43	0.030 8	0.010 8	0.005 7	0.000 3	36.47	1.98	B7	1 238.36		3 418.96		0.36		0.036 9		0.002 3		0.005 6		0.000 1		36.18		0.42
Z9	28.43	65.4	0.43	0.030 8	0.010 8	0.005 7	0.000 3	36.47	1.98	B8	1 636.78		7 033.89		0.23		0.037 3		0.002 8		0.005 7		0.000 1		36.41		0.64
Z10	29.43	228.85	0.13	0.037 7	0.004 2	0.005 7	0.000 2	36.56	1.21	B8	1 636.78		7 033.89		0.23		0.037 3		0.002 8		0.005 7		0.000 1		36.41		0.64
Z10	29.43	228.85	0.13	0.037 7	0.004 2	0.005 7	0.000 2	36.56	1.21	B9	3 254.38		2 303.91		1.41		0.040 6		0.001 8		0.005 7		0.000 1		36.71		0.42
Z11	63.48	638.7	0.1	0.038 3	0.002 7	0.005 7	0.000 1	36.81	0.67	B9	3 254.38		2 303.91		1.41		0.040 6		0.001 8		0.005 7		0.000 1		36.71		0.42
Z11	63.48	638.7	0.1	0.038 3	0.002 7	0.005 7	0.000 1	36.81	0.67	B10	1.64		149.96		0.01		0.036 9		0.004 3		0.005 7		0.000 2		36.85		1.09
Z12	23.14	336.21	0.07	0.038 7	0.003 9	0.005 7	0.000 2	36.91	1.09	B10	1.64		149.96		0.01		0.036 9		0.004 3		0.005 7		0.000 2		36.85		1.09
Z13	13.3	304.18	0.04	0.039 1	0.003 6	0.005 8	0.000 1	37.04	0.89	B11	1 068.41		1 107.51		0.96		0.036 8		0.002 0		0.005 7		0.000 1		36.93		0.49
Z14	2.31	97.93	0.02	0.045 6	0.010 2	0.005 8	0.000 3	37.56	1.69	B11	1 068.41		1 107.51		0.96		0.036 8		0.002 0		0.005 7		0.000 1		36.93		0.49
Z14	2.31	97.93	0.02	0.045 6	0.010 2	0.005 8	0.000 3	37.56	1.69	B12	1 328.96		985.51		1.35		0.038 9		0.002 6		0.005 9		0.000 1		37.63		0.62
Z15	13.47	231.1	0.06	0.041 1	0.006 1	0.005 9	0.000 2	38.17	1.25	B12	1 328.96		985.51		1.35		0.038 9		0.002 6		0.005 9		0.000 1		37.63		0.62
Z15	13.47	231.1	0.06	0.041 1	0.006 1	0.005 9	0.000 2	38.17	1.25	B13	57.28		2 433.86		0.02		0.038 1		0.002 1		0.005 9		0.000 1		37.81		0.47
Z16	29.35	215.53	0.14	0.039 9	0.008 8	0.005 9	0.000 2	38.19	1.24	B13	57.28		2 433.86		0.02		0.038 1		0.002 1		0.005 9		0.000 1		37.81		0.47
Z16	29.35	215.53	0.14	0.039 9	0.008 8	0.005 9	0.000 2	38.19	1.24	B14	2 500.34		2 186.49		1.14		0.042 1		0.001 8		0.006 0		0.000 1		38.28		0.44
Z17	7	67.46	0.1	0.040 4	0.005 4	0.006 0	0.000 3	38.39	1.73	B14	2 500.34		2 186.49		1.14		0.042 1		0.001 8		0.006 0		0.000 1		38.28		0.44
Z17	7	67.46	0.1	0.040 4	0.005 4	0.006 0	0.000 3	38.39	1.73	B15	156.49		1 432.92		0.11		0.044 7		0.001 5		0.006 0		0.000 1		38.58		0.36
Z18	4.01	304	0.01	0.037 6	0.004 0	0.006 0	0.000 2	38.61	1.06	B15	156.49		1 432.92		0.11		0.044 7		0.001 5		0.006 0		0.000 1		38.58		0.36

序号	w_B/10^-6			LREE/ HREE	δCe	δEu	序号	w_B/10^-6			LREE/ HREE	δCe	δEu
序号	LREE	HREE	∑REE	LREE/ HREE	δCe	δEu	序号	LREE	HREE	∑REE	LREE/ HREE	δCe	δEu
Z1	2.62	60.69	63.3	0.04	37.34	0.69	B1	81.61	2 034.79	2 116.4	0.04	6.89	0.7
Z2	11.35	55.91	67.3	0.2	13.17	0.63	B2	6.55	1 089.66	1 096.2	0.01	29.59	0.45
Z3	2.01	118.09	120.1	0.02	23.18	0.59	B3	0.25	310.03	310.3	0	3.77	0.47
Z4	76.02	536.08	612.1	0.14	10.66	0.74	B4	4.08	70.45	74.5	0.06	69.88	0.67
Z5	0.32	22.17	22.5	0.01	4.63	0.3	B5	2.22	40.16	42.4	0.06	13.09	0.74
Z6	15.54	316.98	332.5	0.05	14.24	0.71	B6	156.28	1 255.35	1 411.6	0.12	34.64	0.73
Z7	13.85	326.58	340.4	0.04	41.37	0.82	B7	70.86	1 010.15	1 081.0	0.07	25.85	0.68
Z8	0.31	26.78	27.1	0.01	12.61	0.36	B8	79.49	1 700.89	1 780.4	0.05	22.2	0.59
Z9	8.4	80.57	89	0.1	53.92	0.65	B9	475.67	2 279.87	2 755.5	0.21	94.21	0.64
Z10	5.18	100.13	105.3	0.05	19.84	0.47	B10	1.55	17.91	19.5	0.09	13.98	0.86
Z11	10.2	585.03	595.2	0.02	9.64	0.52	B11	74.43	934.59	1 009.0	0.08	48.43	0.73
Z12	4.16	220.4	224.6	0.02	41.03	0.51	B12	77.66	674.78	752.4	0.12	36.09	0.73
Z13	3.94	144.89	148.8	0.03	23.97	0.61	B13	5.2	1 942.65	1 947.9	0	52.53	0.49
Z14	0.84	377.48	378.3	0	14.2	0.44	B14	83.17	963.1	1 046.3	0.09	55.5	0.69
Z15	3.24	243.21	246.4	0.01	12.59	0.53	B15	19.65	921.63	941.3	0.02	54.64	0.27
Z16	4.52	88.33	92.8	0.05	36.44	0.57
Z17	1.05	7.6	8.7	0.14	27.54	1.23
Z18	2.2	42.02	44.2	0.05	26.38	0.75