Magmatic response to lithospheric thinning of the North China Craton: evidence from porphyritic aegirite-bearing syenite in Wu'an, Hebei, China

doi:10.13745/j.esf.sf.2019.9.24

Abstract

Abstract:

The Hongshan alkaline complex is located in the southern section of the Taihang Mountains, Hebei Province with an outcrop area of about 53 km². Its lithology is dominated by syenite and intruded in the Late Paleozoic-Mesozoic strata. Our study showed that the alkaline intrusive complex belongs to alkaline series, formed in an extensional environment at the age of 120.1±4.6 Ma as a product of the peak period of the North China Craton magmatism. The REE patterns showed no Eu anomaly. The complex is enriched in light rare earth and large ion lithophile elements, such as Rb, K, Sr, and depleted in high field strength elements, such as Nb, Ta and Ti, exhibiting continental crustal characteristics. We observed in the field that the rocks are characterized by deep and shallow-ultra shallow formation. We also observed through electron microprobe analysis that the feldspar has a reverse belt that contained no inherited zircon. These observations, combined with the notion that partial melting of Earth's crust is needed to produce syenitic magma without Eu abnormalities, suggested a formation pressure of greater than 20 kbar. That is, the Hongshan syenite formed by partial melting of the thickened crust with some mantle derived magma mixing and mantle fluid injection to produce its mantle Hf and Nd isotopic signatures without altering the major and trace elemental characteristics, and then rose rapidly to the Earth surface under extensional condition.

Key words: Hongshan, syenite, geochemistry, zircon U-Pb age, magma mixing, tensional tectonic background

CLC Number:

ZHANG Bo, SU Shangguo, MO Xuanxue, FENG Shaochong, WU Yue, JIANG Xiao, FENG Yanfang, LIU Jiangtao. Magmatic response to lithospheric thinning of the North China Craton: evidence from porphyritic aegirite-bearing syenite in Wu'an, Hebei, China[J]. Earth Science Frontiers, 2020, 27(3): 168-181.

Figures/Tables 15

References 69

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岩石类型	矿物类型	w_B/%											An	Ab	Or
岩石类型	矿物类型	SiO₂	TiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	Total	An	Ab	Or
含霓石斑状正长岩	条纹	68.85		19				0.33	11.22			99.4	2.76	97.24	0
	长石1^#	64.75		17.66	0.12	0.02			0.5	17.36		100.41	0	2.51	97.49
	均一												1.35	48.87	49.78
	条纹	68.84		19.42	0.14			0.58	11.43	0.05		100.46	4.64	94.9	0.46
	长石2^#	63.8	0.15	17.51	0.19			0.05	0.4	17.46		99.56	0.24	2	97.76
	均一												2.39	47.47	50.14
	条纹	68.79		18.6	0.25			0.14	11.57			99.35	1.15	98.85	0
	长石3^#	64.38	0.08	17.6	0.08	0.02		0.19	0.33	17.21		99.89	0.93	1.67	97.41
	均一												1.04	49.23	49.74
	条纹	68.68		19.17				0.2	11.25	0.17		99.47	1.66	96.71	1.64
	长石4^#	63.85		17.53	0.2		0.02	0.08	0.61	16.99		99.28	0.39	3.1	96.51
	均一												1.01	48.91	50.08
	条纹	68.9	0.03	18.79	0.17			0.09	11.66	0.1		99.74	0.73	98.33	0.94
	长石5^#	64.64		17.66	0.14		0.03		0.53	17.54		100.54	0	2.63	97.37
	均一												0.36	49.47	50.18
	环带长石	65.77		19.23					6.4	8.42		99.82	0	40.45	59.55
		64.89		19.05				0.7	7.02	7.75		99.41	4.12	42.89	52.99
		67.24	0.08	20.62	0.21			1.82	10.47	0.29		100.73	13.97	83.44	2.59

岩石类型	矿物类型	w_B/%											An	Ab	Or
岩石类型	矿物类型	SiO₂	TiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	Total	An	Ab	Or
含霓石斑状正长岩	条纹	68.85		19				0.33	11.22			99.4	2.76	97.24	0
	长石1^#	64.75		17.66	0.12	0.02			0.5	17.36		100.41	0	2.51	97.49
	均一												1.35	48.87	49.78
	条纹	68.84		19.42	0.14			0.58	11.43	0.05		100.46	4.64	94.9	0.46
	长石2^#	63.8	0.15	17.51	0.19			0.05	0.4	17.46		99.56	0.24	2	97.76
	均一												2.39	47.47	50.14
	条纹	68.79		18.6	0.25			0.14	11.57			99.35	1.15	98.85	0
	长石3^#	64.38	0.08	17.6	0.08	0.02		0.19	0.33	17.21		99.89	0.93	1.67	97.41
	均一												1.04	49.23	49.74
	条纹	68.68		19.17				0.2	11.25	0.17		99.47	1.66	96.71	1.64
	长石4^#	63.85		17.53	0.2		0.02	0.08	0.61	16.99		99.28	0.39	3.1	96.51
	均一												1.01	48.91	50.08
	条纹	68.9	0.03	18.79	0.17			0.09	11.66	0.1		99.74	0.73	98.33	0.94
	长石5^#	64.64		17.66	0.14		0.03		0.53	17.54		100.54	0	2.63	97.37
	均一												0.36	49.47	50.18
	环带长石	65.77		19.23					6.4	8.42		99.82	0	40.45	59.55
		64.89		19.05				0.7	7.02	7.75		99.41	4.12	42.89	52.99
		67.24	0.08	20.62	0.21			1.82	10.47	0.29		100.73	13.97	83.44	2.59

样品名称	样品编号		w_B/%
样品名称	样品编号		SiO₂		Al₂O₃			TiO₂			Fe₂O₃			FeO			CaO			MgO			K₂O		Na₂O			MnO			P₂O₅		LOI	Total
粗粒正长岩	HS-01	62.92		16.99			0.5			3.45			0.93			1.26			0.62			5.88		6.22			0.08			0.21			0.73	99.79
粗粒正长岩	HS-04	64.91		17.79			0.34			2.53			0.31			0.38			0.24			6.18		6.36			0.03			0.1			0.67	99.84
含霓石斑状正长岩	JY-01	63.29		17.31			0.4			2.77			0.86			1.43			0.86			5.71		6.21			0.09			0.17			0.68	99.78
	JY-13	62.98		17.06			0.38			2.34			1.03			1.93			1.01			5.76		6.16			0.07			0.15			0.96	99.83
	JY-14	63.65		18.08			0.42			3.06			0.14			0.67			0.41			6.03		5.96			0.07			0.18			1.11	99.78
样品名称	样品编号		w_B/10^-6
样品名称	样品编号		Li		Be			Sc			V			Cr			Co			Ni			Cu		Zn			Ga			Ge		Rb	Sr
粗粒正长岩	HS-07	39.5		7.83			12.9			151			21.8			6.8			7.51			89.2		105			24.2			1.41			139	745
粗粒正长岩	HS-10	35.6		5.35			10.8			134			26.4			3.77			7.74			282		97.2			27.6			1.28			134	346
含霓石斑状正长岩	JY-01	37.8		8.05			11.2			85.6			26.8			6.79			9.38			42.9		70.7			21.3			1.18			148	886
	JY-13	60.7		4.62			11			82.4			25.9			6.73			9.25			38.8		71.8			20.9			1.21			175	715
	JY-14	30.8		5.56			12.1			99.2			32.7			4.18			11			39.5		67.3			22.3			1.34			167	729
样品名称	样品编号		w_B/10^-6
样品名称	样品编号		Y		Zr			Nb			Mo			Cs			Ba			La			Ce		Pr			Nd			Sm		Eu	Gd
粗粒正长岩	HS-13	14.3		307			19.8			1.63			1.46			614			30			50.6		5.71			19.3			3.73			1	2.95
粗粒正长岩	HS-16	10.2		310			13			1.82			0.39			377			23.1			37.3		4.06			13.4			2.53			0.78	2.05
含霓石斑状正长岩	JY-01	13.4		225			11.5			1.45			2.75			736			25.9			42.6		4.72			16.5			3.03			0.94	2.55
	JY-13	13.7		178			10.2			8.62			3.4			685			29.9			44.6		4.74			16.2			2.98			0.91	2.54
	JY-14	10.8		224			12.3			1.97			2.58			801			24.5			43.2		4.37			15.3			2.79			0.85	2.18
样品名称	样品编号		w_B/10^-6
样品名称	样品编号		Tb		Dy			Ho			Er			Tm			Yb			Lu			Hf		Ta			W			Tl		Pb	Bi
粗粒正长岩	HS-19	0.46		2.29			0.45			1.37			0.2			1.42			0.21			6.81		1.34			2.63			0.34			50	0.13
粗粒正长岩	HS-22	0.32		1.56			0.31			0.96			0.15			1.06			0.17			6.48		0.84			2.22			0.22			14.2	0.16
含霓石斑状正长岩	JY-01	0.39		1.93			0.38			1.15			0.17			1.15			0.18			4.39		2.38			1.49			0.56			25.2	0.13
	JY-13	0.39		1.93			0.38			1.16			0.17			1.15			0.17			3.31		1.91			4.35			0.59			38.8	0.23
	JY-14	0.32		1.58			0.31			0.96			0.14			0.97			0.15			4.47		0.48			7.49			0.56			41.1	0.16
样品名称	样品编号		w_B/10^-6						Mg^#			A/CNK			w(全碱) /%			w(∑REE) /10^-6			LREE/HREE					(La/ Yb)_N			(Gd/ Yb)_N			δEu
样品名称	样品编号		Th			U			Mg^#			A/CNK			w(全碱) /%			w(∑REE) /10^-6			LREE/HREE					(La/ Yb)_N			(Gd/ Yb)_N			δEu
粗粒正长岩	HS-25		10.6			3.16			21.42			0.96			12.19			119.68			11.82					14.28			1.68			0.93
粗粒正长岩	HS-28		6.29			2.09			14.02			1.02			12.64			87.74			12.36					14.65			1.56			1.05
含霓石斑状正长岩	JY-01		7.87			2.07			31.21			0.98			12.02			101.58			11.88					15.13			1.78			1.03
	JY-13		5.48			1.69			36.47			0.94			12.04			107.22			12.59					17.48			1.78			1.01
	JY-14		8.22			1.81			20.24			1.07			12.15			97.6			13.8					17.12			1.82			1.05

样品名称	样品编号		w_B/%
样品名称	样品编号		SiO₂		Al₂O₃			TiO₂			Fe₂O₃			FeO			CaO			MgO			K₂O		Na₂O			MnO			P₂O₅		LOI	Total
粗粒正长岩	HS-01	62.92		16.99			0.5			3.45			0.93			1.26			0.62			5.88		6.22			0.08			0.21			0.73	99.79
粗粒正长岩	HS-04	64.91		17.79			0.34			2.53			0.31			0.38			0.24			6.18		6.36			0.03			0.1			0.67	99.84
含霓石斑状正长岩	JY-01	63.29		17.31			0.4			2.77			0.86			1.43			0.86			5.71		6.21			0.09			0.17			0.68	99.78
	JY-13	62.98		17.06			0.38			2.34			1.03			1.93			1.01			5.76		6.16			0.07			0.15			0.96	99.83
	JY-14	63.65		18.08			0.42			3.06			0.14			0.67			0.41			6.03		5.96			0.07			0.18			1.11	99.78
样品名称	样品编号		w_B/10^-6
样品名称	样品编号		Li		Be			Sc			V			Cr			Co			Ni			Cu		Zn			Ga			Ge		Rb	Sr
粗粒正长岩	HS-07	39.5		7.83			12.9			151			21.8			6.8			7.51			89.2		105			24.2			1.41			139	745
粗粒正长岩	HS-10	35.6		5.35			10.8			134			26.4			3.77			7.74			282		97.2			27.6			1.28			134	346
含霓石斑状正长岩	JY-01	37.8		8.05			11.2			85.6			26.8			6.79			9.38			42.9		70.7			21.3			1.18			148	886
	JY-13	60.7		4.62			11			82.4			25.9			6.73			9.25			38.8		71.8			20.9			1.21			175	715
	JY-14	30.8		5.56			12.1			99.2			32.7			4.18			11			39.5		67.3			22.3			1.34			167	729
样品名称	样品编号		w_B/10^-6
样品名称	样品编号		Y		Zr			Nb			Mo			Cs			Ba			La			Ce		Pr			Nd			Sm		Eu	Gd
粗粒正长岩	HS-13	14.3		307			19.8			1.63			1.46			614			30			50.6		5.71			19.3			3.73			1	2.95
粗粒正长岩	HS-16	10.2		310			13			1.82			0.39			377			23.1			37.3		4.06			13.4			2.53			0.78	2.05
含霓石斑状正长岩	JY-01	13.4		225			11.5			1.45			2.75			736			25.9			42.6		4.72			16.5			3.03			0.94	2.55
	JY-13	13.7		178			10.2			8.62			3.4			685			29.9			44.6		4.74			16.2			2.98			0.91	2.54
	JY-14	10.8		224			12.3			1.97			2.58			801			24.5			43.2		4.37			15.3			2.79			0.85	2.18
样品名称	样品编号		w_B/10^-6
样品名称	样品编号		Tb		Dy			Ho			Er			Tm			Yb			Lu			Hf		Ta			W			Tl		Pb	Bi
粗粒正长岩	HS-19	0.46		2.29			0.45			1.37			0.2			1.42			0.21			6.81		1.34			2.63			0.34			50	0.13
粗粒正长岩	HS-22	0.32		1.56			0.31			0.96			0.15			1.06			0.17			6.48		0.84			2.22			0.22			14.2	0.16
含霓石斑状正长岩	JY-01	0.39		1.93			0.38			1.15			0.17			1.15			0.18			4.39		2.38			1.49			0.56			25.2	0.13
	JY-13	0.39		1.93			0.38			1.16			0.17			1.15			0.17			3.31		1.91			4.35			0.59			38.8	0.23
	JY-14	0.32		1.58			0.31			0.96			0.14			0.97			0.15			4.47		0.48			7.49			0.56			41.1	0.16
样品名称	样品编号		w_B/10^-6						Mg^#			A/CNK			w(全碱) /%			w(∑REE) /10^-6			LREE/HREE					(La/ Yb)_N			(Gd/ Yb)_N			δEu
样品名称	样品编号		Th			U			Mg^#			A/CNK			w(全碱) /%			w(∑REE) /10^-6			LREE/HREE					(La/ Yb)_N			(Gd/ Yb)_N			δEu
粗粒正长岩	HS-25		10.6			3.16			21.42			0.96			12.19			119.68			11.82					14.28			1.68			0.93
粗粒正长岩	HS-28		6.29			2.09			14.02			1.02			12.64			87.74			12.36					14.65			1.56			1.05
含霓石斑状正长岩	JY-01		7.87			2.07			31.21			0.98			12.02			101.58			11.88					15.13			1.78			1.03
	JY-13		5.48			1.69			36.47			0.94			12.04			107.22			12.59					17.48			1.78			1.01
	JY-14		8.22			1.81			20.24			1.07			12.15			97.6			13.8					17.12			1.82			1.05

分析点号	w_B/10^-6		Th/U	同位素比值				年龄/Ma
分析点号	Th	U	Th/U	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
JY2-01_02	15 843	10 127	1.52	0.235 1	0.019 1	0.019 2	0.000 3	214.4	15.7	122.5	1.7
JY2-01_03	12 715	6 775	1.92	0.138 7	0.004 5	0.018 3	0.000 2	131.9	4.0	117.0	1.3
JY2-01_04	18 789	9 821	1.93	0.137 5	0.003 1	0.017 9	0.000 2	130.8	2.8	114.5	1.0
JY2-01_05	20 921	10 958	1.88	0.144 1	0.003 9	0.018 9	0.000 2	136.7	3.5	120.6	1.6
JY2-01_06	13 218	5 572	2.42	0.167 1	0.004 7	0.020 8	0.000 3	156.9	4.1	132.7	1.7
JY2-01_07	14 445	5 974	2.32	0.139 3	0.004 1	0.019 7	0.000 3	132.4	3.7	126.0	1.6
JY2-01_10	11 684	5 363	2.18	0.131	0.004 2	0.019 6	0.000 3	125.0	3.8	125.2	1.8
JY2-01_11	12 721	7 232	1.79	0.353 5	0.009 6	0.020 9	0.000 3	307.4	7.2	133.3	1.8
JY2-01_12	12 397	8 239	1.53	0.145 2	0.004 5	0.017	0.000 2	137.7	4.0	108.8	1.1
JY2-01_14	73 653	33 306	2.21	0.151 4	0.003 7	0.018 4	0.000 2	143.2	3.3	117.6	1.0
JY2-01_16	20 673	8 438	2.46	0.145 2	0.005 8	0.017 8	0.000 2	137.6	5.2	113.6	1.1
JY2-01_17	15 343	7 840	1.95	0.255 7	0.013 5	0.018 8	0.000 3	231.2	10.9	120.3	1.8
JY2-01_18	17 952	5 566	3.23	0.214 8	0.006 2	0.020 8	0.000 3	197.5	5.2	133.0	1.6
JY2-01_19	8 022	3 731	2.11	0.131 9	0.004 1	0.020 3	0.000 2	125.8	3.7	129.4	1.2