Geochemistry Characteristics and Tectonic Environment Analysis of Middle Jurassic A-type Granites in Zhangjiawan Area, Heilongjiang Province

doi:10.19657/j.geoscience.1000-8527.2020.038

Abstract

Abstract:

Through comprehensive petrographic and geochemical analyses of the Middle Jurassic syenite and alkali feldspar granite in Zhangjiawan area (Heilongjiang Province), we explore the regional granitic magmatism, genetic type and tectonic environment. The results show that the syenite granite and alkali feldspar granite have high SiO₂(73.12%-77.82%), and are alkali-rich (K₂O+Na₂O = 6.36%-8.56%), Fe-rich and Mg-poor (FeO ^T/MgO = 6.67-25.43). The rocks have aluminum saturation index (A/CNK value) mostly above 1.1, distinct negative Eu anomalies (δEu = 0.01-0.74), enrichments in Th, U, K and Rb, and depletions in Ba, Sr, P and Ti. Zircon saturation temperatures are calculated to be 757-900 ℃, with an average of 816 ℃. The granites are A-type, and likely evolved from highly-fractionated granite to peraluminous A-type granite. REE features indicate that the magma was sourced from a mixture of mantle and lower crustal materials. The mid-Jurassic syenite granite-alkaline granite is A2-type, and was likely formed in a post-orogenic lithospheric extension setting. The above-mentioned lithogeochemical characteristics indicate that the Middle Jurassic regional tectonics was influenced by the west-dipping Paleo-Pacific subduction and post-collisional orogeny. The Zhangjiawan area was in a post-orogenic extension environment, and the lithosphere tectonic regime changed from compressive to extensional. The mantle upwelling accompanied by magma intrusion may have triggered the melting of crustal materials, which formed the syenite and alkali feldspar granite in the area.

Key words: Zhangjiawan area, Middle Jurassic, A-type granite, geochemistry, tectonic environment

CLC Number:

P588.1
P595

REN Yongjian, CHENG Shuo, ZHANG Mingming, CAO Guangyuan, YU Wang, ZHAO Han, LIANG Heng, WANG Fuqiang, QI Caiji. Geochemistry Characteristics and Tectonic Environment Analysis of Middle Jurassic A-type Granites in Zhangjiawan Area, Heilongjiang Province[J]. Geoscience, 2020, 34(05): 1067-1076.

Figures/Tables 11

References 37

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样号	岩性	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	T_Zr/℃
PM005-YH1	正长花岗岩	77.56	0.16	12.52	0.52	1.2	0.058	0.250	0.86	3.02	3.73	0.035	809.19
PM005-YH2	正长花岗岩	77.09	0.92	12.24	0.77	0.96	0.049	0.065	0.79	2.85	3.51	0.032	815.80
PM005-YH3	正长花岗岩	73.61	0.15	16.42	0.17	0.42	0.033	0.067	0.43	3.35	4.71	0.022	898.77
PM005-YH4	正长花岗岩	74.76	0.13	13.87	0.59	1.14	0.056	0.110	0.78	3.45	4.36	0.031	846.15
PM005-YH5	正长花岗岩	77.16	0.08	12.84	0.78	0.72	0.038	0.200	0.53	2.78	3.79	0.025	798.97
PM006-YH3	正长花岗岩	77.05	0.15	13.29	0.89	0.64	0.05	0.120	0.70	2.58	4.28	0.05	705.77
PM006-YH4	正长花岗岩	76.89	0.10	13.40	0.95	0.55	0.042	0.170	0.81	2.58	3.9	0.046	757.26
PM014-1-YH02	正长花岗岩	73.12	0.20	13.75	0.85	1.22	0.087	0.260	0.78	4.40	4.16	0.071	819.38
PM012-YH01	碱长花岗岩	75.75	0.18	12.58	0.55	1.36	0.073	0.300	1.04	4.01	3.47	0.077	793.11
PM012-YH02	碱长花岗岩	77.82	0.05	12.40	0.36	0.91	0.039	0.060	0.34	4.49	4.01	0.019	827.59
DC08-YH01	碱长花岗岩	76.97	0.17	13.37	0.42	1.33	0.051	0.170	1.06	3.18	3.38	0.047	791.00
样号	岩性	C	DI	SI	δ	τ	R1	R2	AR	ALK	A/CNK	A/NK	K/Na
PM005-YH1	正长花岗岩	2.59	90.98	2.87	1.32	59.38	3 165	349	3.04	6.75	1.025	1.85	1.24
PM005-YH2	正长花岗岩	2.53	90.99	0.80	1.18	10.21	3 254	330	2.91	6.36	1.045	1.92	1.23
PM005-YH3	正长花岗岩	5.36	91.89	0.77	2.12	87.13	2 605	373	2.83	8.06	1.174	2.04	1.41
PM005-YH4	正长花岗岩	2.40	91.39	1.14	1.92	80.15	2 701	363	3.28	7.81	1.185	1.78	1.26
PM005-YH5	正长花岗岩	3.41	91.67	2.42	1.26	121.20	3 257	322	2.93	6.57	1.233	1.95	1.36
PM006-YH3	正长花岗岩	3.38	91.14	1.41	1.38	71.40	3 176	342	2.92	6.86	1.309	1.94	1.66
PM006-YH4	正长花岗岩	3.71	90.16	2.09	1.24	108.20	3 269	360	2.68	6.48	1.332	2.07	1.51
PM014-1-YH02	正长花岗岩	0.93	92.08	2.39	2.42	46.75	2 298	370	3.87	8.56	1.348	1.61	0.95
PM012-YH01	碱长花岗岩	1.54	91.62	3.10	1.71	47.61	2 758	374	3.44	7.48	1.030	1.68	0.87
PM012-YH02	碱长花岗岩	0.47	96.46	0.61	2.08	161.43	2 598	281	5.01	8.50	1.000	1.46	0.89
DC08-YH01	碱长花岗岩	2.71	89.06	2.00	1.27	59.94	3 149	383	2.67	6.56	1.240	2.04	1.06

样号	岩性	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	T_Zr/℃
PM005-YH1	正长花岗岩	77.56	0.16	12.52	0.52	1.2	0.058	0.250	0.86	3.02	3.73	0.035	809.19
PM005-YH2	正长花岗岩	77.09	0.92	12.24	0.77	0.96	0.049	0.065	0.79	2.85	3.51	0.032	815.80
PM005-YH3	正长花岗岩	73.61	0.15	16.42	0.17	0.42	0.033	0.067	0.43	3.35	4.71	0.022	898.77
PM005-YH4	正长花岗岩	74.76	0.13	13.87	0.59	1.14	0.056	0.110	0.78	3.45	4.36	0.031	846.15
PM005-YH5	正长花岗岩	77.16	0.08	12.84	0.78	0.72	0.038	0.200	0.53	2.78	3.79	0.025	798.97
PM006-YH3	正长花岗岩	77.05	0.15	13.29	0.89	0.64	0.05	0.120	0.70	2.58	4.28	0.05	705.77
PM006-YH4	正长花岗岩	76.89	0.10	13.40	0.95	0.55	0.042	0.170	0.81	2.58	3.9	0.046	757.26
PM014-1-YH02	正长花岗岩	73.12	0.20	13.75	0.85	1.22	0.087	0.260	0.78	4.40	4.16	0.071	819.38
PM012-YH01	碱长花岗岩	75.75	0.18	12.58	0.55	1.36	0.073	0.300	1.04	4.01	3.47	0.077	793.11
PM012-YH02	碱长花岗岩	77.82	0.05	12.40	0.36	0.91	0.039	0.060	0.34	4.49	4.01	0.019	827.59
DC08-YH01	碱长花岗岩	76.97	0.17	13.37	0.42	1.33	0.051	0.170	1.06	3.18	3.38	0.047	791.00
样号	岩性	C	DI	SI	δ	τ	R1	R2	AR	ALK	A/CNK	A/NK	K/Na
PM005-YH1	正长花岗岩	2.59	90.98	2.87	1.32	59.38	3 165	349	3.04	6.75	1.025	1.85	1.24
PM005-YH2	正长花岗岩	2.53	90.99	0.80	1.18	10.21	3 254	330	2.91	6.36	1.045	1.92	1.23
PM005-YH3	正长花岗岩	5.36	91.89	0.77	2.12	87.13	2 605	373	2.83	8.06	1.174	2.04	1.41
PM005-YH4	正长花岗岩	2.40	91.39	1.14	1.92	80.15	2 701	363	3.28	7.81	1.185	1.78	1.26
PM005-YH5	正长花岗岩	3.41	91.67	2.42	1.26	121.20	3 257	322	2.93	6.57	1.233	1.95	1.36
PM006-YH3	正长花岗岩	3.38	91.14	1.41	1.38	71.40	3 176	342	2.92	6.86	1.309	1.94	1.66
PM006-YH4	正长花岗岩	3.71	90.16	2.09	1.24	108.20	3 269	360	2.68	6.48	1.332	2.07	1.51
PM014-1-YH02	正长花岗岩	0.93	92.08	2.39	2.42	46.75	2 298	370	3.87	8.56	1.348	1.61	0.95
PM012-YH01	碱长花岗岩	1.54	91.62	3.10	1.71	47.61	2 758	374	3.44	7.48	1.030	1.68	0.87
PM012-YH02	碱长花岗岩	0.47	96.46	0.61	2.08	161.43	2 598	281	5.01	8.50	1.000	1.46	0.89
DC08-YH01	碱长花岗岩	2.71	89.06	2.00	1.27	59.94	3 149	383	2.67	6.56	1.240	2.04	1.06

样号	岩性	La	Ce	Pr		Nd		Sm		Eu		Gd		Tb		Dy		Ho		Er		Tm		Yb		Lu		Y		ΣREE		L/H		(La/Yb)_N
PM005-YH1	正长花岗岩	47.7	115.0	9.10		34.2		4.95		0.56		4.19		0.60		3.31		0.64		1.84		0.29		2.14		0.40		16.9		224.92		15.77		15.99
PM005-YH2	正长花岗岩	46.0	94.3	8.88		32.8		4.81		0.46		3.93		0.60		3.43		0.64		1.86		0.30		2.03		0.41		16.6		200.45		14.19		16.25
PM005-YH3	正长花岗岩	103.0	129.0	17.40		60.0		6.90		1.20		6.15		0.77		4.05		0.79		2.43		0.40		2.82		0.55		21.1		335.46		17.68		26.20
PM005-YH4	正长花岗岩	77.9	134.0	12.60		44.3		5.40		0.91		4.66		0.61		3.28		0.62		1.82		0.28		2.09		0.40		16.5		288.87		19.99		26.74
PM005-YH5	正长花岗岩	13.8	31.5	4.43		18.9		4.42		0.40		3.86		0.81		5.17		1.01		2.84		0.45		3.07		0.53		25.7		91.19		4.14		3.22
PM006-YH3	正长花岗岩	27.2	69.2	5.84		21.1		3.48		0.60		2.67		0.38		2.14		0.43		1.27		0.22		1.64		0.33		12.0		136.50		14.03		11.90
PM006-YH4	正长花岗岩	15.2	38.4	3.00		10.1		1.93		0.43		1.50		0.23		1.43		0.31		1.01		0.20		1.66		0.35		8.9		75.75		10.32		6.57
PM014-1-YH02	正长花岗岩	40.6	84.2	8.65		30.2		5.52		0.61		4.87		0.81		4.96		0.98		2.97		0.47		3.09		0.54		27.8		188.47		9.08		9.42
PM012-YH01	碱长花岗岩	19.5	53.4	4.08		14.2		2.87		0.60		2.80		0.47		3.02		0.63		1.97		0.34		2.17		0.39		17.7		106.44		8.03		6.45
PM012-YH02	碱长花岗岩	15.3	44.5	6.30		25.3		9.00		0.04		9.17		2.31		18.20		3.85		12.50		2.26		14.90		2.46		134.0		166.09		1.53		0.74
DC08-YH01	碱长花岗岩	34.7	81.5	8.96		35.7		7.67		0.51		6.90		1.21		7.18		1.43		4.10		0.66		4.29		0.70		37.5		195.51		6.39		5.80
样号	岩性	δEu	Ba		Be		Co		Cr		Hf		Li		Nb		Ni		Rb		Sc		Sr		Th		U		V		Zr		Rb/Sr		Ba/Sr
PM005-YH1	正长花岗岩	0.37	422.0		1.55		1.75		4.01		3.05		10.10		009.41		1.69		78.8		3.92		83.6		007.89		01.00		10.30		168.0		0.94		5.05
PM005-YH2	正长花岗岩	0.31	415.0		1.44		0.91		4.82		3.27		6.88		8.72		1.58		79.2		3.41		29.5		7.13		0.80		2.42		172.0		2.68		14.07
PM005-YH3	正长花岗岩	0.55	913.0		1.16		0.62		3.40		5.90		4.42		11.00		1.62		119.0		6.04		77.2		9.48		0.78		2.38		369.0		1.54		11.83
PM005-YH4	正长花岗岩	0.54	1 078.0		1.63		0.63		4.35		4.84		6.60		8.41		1.47		90.1		4.76		43.2		7.33		0.62		1.82		261.0		2.09		24.95
PM005-YH5	正长花岗岩	0.29	353.0		2.16		1.36		4.42		2.02		3.16		9.85		1.92		111.0		7.45		62.5		10.70		1.75		1.91		134.0		1.78		5.65
PM006-YH3	正长花岗岩	0.58	438.0		2.36		1.30		6.32		0.62		13.50		11.10		1.71		152.0		2.74		99.9		12.30		2.06		3.86		43.6		1.52		4.38
PM006-YH4	正长花岗岩	0.74	280.0		3.17		1.24		3.38		1.09		8.83		11.30		2.17		162.0		1.64		141.0		35.40		3.72		3.78		82.0		1.15		1.99
PM014-1-YH02	正长花岗岩	0.35	485.0		3.19		1.71		4.96		8.66		21.00		15.70		2.17		113.0		4.43		298.0		17.90		2.46		5.07		230.0		0.38		1.63
PM012-YH01	碱长花岗岩	0.64	386.0		2.95		1.70		7.28		7.32		29.80		16.30		2.88		121.0		3.60		290.0		17.50		2.16		6.09		168.0		0.42		1.33
PM012-YH02	碱长花岗岩	0.01	12.5		3.73		0.59		5.75		15.90		84.20		53.70		1.97		134.0		1.71		15.4		49.80		5.00		1.10		249.0		8.70		0.81
DC08-YH01	碱长花岗岩	0.21	236.0		2.65		1.55		6.01		5.94		37.20		15.40		3.64		119.0		7.98		63.2		12.40		1.45		7.78		133.0		1.88		3.73

样号	岩性	La	Ce	Pr		Nd		Sm		Eu		Gd		Tb		Dy		Ho		Er		Tm		Yb		Lu		Y		ΣREE		L/H		(La/Yb)_N
PM005-YH1	正长花岗岩	47.7	115.0	9.10		34.2		4.95		0.56		4.19		0.60		3.31		0.64		1.84		0.29		2.14		0.40		16.9		224.92		15.77		15.99
PM005-YH2	正长花岗岩	46.0	94.3	8.88		32.8		4.81		0.46		3.93		0.60		3.43		0.64		1.86		0.30		2.03		0.41		16.6		200.45		14.19		16.25
PM005-YH3	正长花岗岩	103.0	129.0	17.40		60.0		6.90		1.20		6.15		0.77		4.05		0.79		2.43		0.40		2.82		0.55		21.1		335.46		17.68		26.20
PM005-YH4	正长花岗岩	77.9	134.0	12.60		44.3		5.40		0.91		4.66		0.61		3.28		0.62		1.82		0.28		2.09		0.40		16.5		288.87		19.99		26.74
PM005-YH5	正长花岗岩	13.8	31.5	4.43		18.9		4.42		0.40		3.86		0.81		5.17		1.01		2.84		0.45		3.07		0.53		25.7		91.19		4.14		3.22
PM006-YH3	正长花岗岩	27.2	69.2	5.84		21.1		3.48		0.60		2.67		0.38		2.14		0.43		1.27		0.22		1.64		0.33		12.0		136.50		14.03		11.90
PM006-YH4	正长花岗岩	15.2	38.4	3.00		10.1		1.93		0.43		1.50		0.23		1.43		0.31		1.01		0.20		1.66		0.35		8.9		75.75		10.32		6.57
PM014-1-YH02	正长花岗岩	40.6	84.2	8.65		30.2		5.52		0.61		4.87		0.81		4.96		0.98		2.97		0.47		3.09		0.54		27.8		188.47		9.08		9.42
PM012-YH01	碱长花岗岩	19.5	53.4	4.08		14.2		2.87		0.60		2.80		0.47		3.02		0.63		1.97		0.34		2.17		0.39		17.7		106.44		8.03		6.45
PM012-YH02	碱长花岗岩	15.3	44.5	6.30		25.3		9.00		0.04		9.17		2.31		18.20		3.85		12.50		2.26		14.90		2.46		134.0		166.09		1.53		0.74
DC08-YH01	碱长花岗岩	34.7	81.5	8.96		35.7		7.67		0.51		6.90		1.21		7.18		1.43		4.10		0.66		4.29		0.70		37.5		195.51		6.39		5.80
样号	岩性	δEu	Ba		Be		Co		Cr		Hf		Li		Nb		Ni		Rb		Sc		Sr		Th		U		V		Zr		Rb/Sr		Ba/Sr
PM005-YH1	正长花岗岩	0.37	422.0		1.55		1.75		4.01		3.05		10.10		009.41		1.69		78.8		3.92		83.6		007.89		01.00		10.30		168.0		0.94		5.05
PM005-YH2	正长花岗岩	0.31	415.0		1.44		0.91		4.82		3.27		6.88		8.72		1.58		79.2		3.41		29.5		7.13		0.80		2.42		172.0		2.68		14.07
PM005-YH3	正长花岗岩	0.55	913.0		1.16		0.62		3.40		5.90		4.42		11.00		1.62		119.0		6.04		77.2		9.48		0.78		2.38		369.0		1.54		11.83
PM005-YH4	正长花岗岩	0.54	1 078.0		1.63		0.63		4.35		4.84		6.60		8.41		1.47		90.1		4.76		43.2		7.33		0.62		1.82		261.0		2.09		24.95
PM005-YH5	正长花岗岩	0.29	353.0		2.16		1.36		4.42		2.02		3.16		9.85		1.92		111.0		7.45		62.5		10.70		1.75		1.91		134.0		1.78		5.65
PM006-YH3	正长花岗岩	0.58	438.0		2.36		1.30		6.32		0.62		13.50		11.10		1.71		152.0		2.74		99.9		12.30		2.06		3.86		43.6		1.52		4.38
PM006-YH4	正长花岗岩	0.74	280.0		3.17		1.24		3.38		1.09		8.83		11.30		2.17		162.0		1.64		141.0		35.40		3.72		3.78		82.0		1.15		1.99
PM014-1-YH02	正长花岗岩	0.35	485.0		3.19		1.71		4.96		8.66		21.00		15.70		2.17		113.0		4.43		298.0		17.90		2.46		5.07		230.0		0.38		1.63
PM012-YH01	碱长花岗岩	0.64	386.0		2.95		1.70		7.28		7.32		29.80		16.30		2.88		121.0		3.60		290.0		17.50		2.16		6.09		168.0		0.42		1.33
PM012-YH02	碱长花岗岩	0.01	12.5		3.73		0.59		5.75		15.90		84.20		53.70		1.97		134.0		1.71		15.4		49.80		5.00		1.10		249.0		8.70		0.81
DC08-YH01	碱长花岗岩	0.21	236.0		2.65		1.55		6.01		5.94		37.20		15.40		3.64		119.0		7.98		63.2		12.40		1.45		7.78		133.0		1.88		3.73