Magmatic Activity and Emplacement of the Devonian Intrusive Rocks in Eastern Altay, Northern Xinjiang

doi:10.19657/j.geoscience.1000-8527.2020.03.016

Abstract

Abstract:

A large number of magmatic rocks were developed in the eastern Altay, northern Xinjiang. LA-ICP-MS zircon U-Pb dating indicates that the Adeer quartz diorite porphyry and Qiaolakesayi granodiorite were emplaced at (415.7±4.0) Ma and (413.5±3.0) Ma, respectively. These ages revealed that the rocks were emplaced in the Early Devonian. There are significant major-element geochemical differences between the two rock types, but their trace-element (including REE) features are largely similar.The quartz diorite porphyry is medium-low-K calc-alkaline and peraluminous, but the granodiorite is high-K calc-alkaline and metaluminous. The REE distribution patterns reveal that the rocks are LREE-enriched, HREE-depleted, and with strong LREE/HREE fractionation and weakly-moderately negative Eu anomalies. The rocks are enriched in LILEs (Rb, Th, U) and LREEs, and clearly depleted in HFSEs (Nb, Zr, Ti),Sr, and P,demonstrating a subduction-related affinity. Considering also the regional geology, we concluded that magmatism was active in the Early Devonian eastern Altay, and with complex petrogenetic cause and emplacement mode, which formed the various igneous rock assemblages in the region. This plutonism may have been the product of hot mantle and hot crustal structure, and has the potential to generate super-large deposits.

Key words: Early Devonian, oceanic crust subduction, hot mantle and hot crustal structure, eastern Altay, northern Xinjiang

CLC Number:

P588.1

LIN Xinwang, WANG Xing, CHEN Guangting, ZHAO Duanchang, ZHAO Jianglin. Magmatic Activity and Emplacement of the Devonian Intrusive Rocks in Eastern Altay, Northern Xinjiang[J]. Geoscience, 2020, 34(03): 514-531.

Figures/Tables 13

References 82

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样品岩性	样品编号	主量元素含量/%
样品岩性	样品编号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O
石英闪长斑岩	D1402/1	67.14	0.59	15.10	0.83	4.08	0.09	1.79	3.40	3.23
	D1402/2	68.98	0.55	15.89	1.35	3.21	0.06	1.25	4.35	2.74
	D1402/3	66.68	0.53	16.95	0.75	4.02	0.09	1.58	2.91	3.07
花岗闪长岩	D2404/2	74.35	0.45	11.81	1.07	2.71	0.03	0.88	1.61	2.53
	D2404/3	75.38	0.47	11.17	0.48	2.77	0.04	0.59	1.69	2.57
	D2404/4	74.48	0.51	11.53	0.65	2.99	0.06	0.66	1.59	2.62
样品岩性	样品编号	主量元素含量/%				特征值
样品岩性	样品编号	K₂O	P₂O₅	烧失量	总量	A/CNK	σ	Mg^#	SI
石英闪长斑岩	D1402/1	2.82	0.15	0.32	99.54	1.04	1.52	42.90	14.04
	D1402/2	1.07	0.12	0.76	100.33	1.17	0.56	36.37	12.99
	D1402/3	2.20	0.10	0.68	99.56	1.33	1.17	40.51	13.59
花岗闪长岩	D2404/2	3.97	0.10	0.16	99.67	1.04	1.35	32.67	7.89
	D2404/3	4.29	0.10	0.23	99.78	0.93	1.45	27.16	5.51
	D2404/4	4.23	0.11	0.26	99.69	0.98	1.49	27.22	5.92

样品岩性	样品编号	主量元素含量/%
样品岩性	样品编号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O
石英闪长斑岩	D1402/1	67.14	0.59	15.10	0.83	4.08	0.09	1.79	3.40	3.23
	D1402/2	68.98	0.55	15.89	1.35	3.21	0.06	1.25	4.35	2.74
	D1402/3	66.68	0.53	16.95	0.75	4.02	0.09	1.58	2.91	3.07
花岗闪长岩	D2404/2	74.35	0.45	11.81	1.07	2.71	0.03	0.88	1.61	2.53
	D2404/3	75.38	0.47	11.17	0.48	2.77	0.04	0.59	1.69	2.57
	D2404/4	74.48	0.51	11.53	0.65	2.99	0.06	0.66	1.59	2.62
样品岩性	样品编号	主量元素含量/%				特征值
样品岩性	样品编号	K₂O	P₂O₅	烧失量	总量	A/CNK	σ	Mg^#	SI
石英闪长斑岩	D1402/1	2.82	0.15	0.32	99.54	1.04	1.52	42.90	14.04
	D1402/2	1.07	0.12	0.76	100.33	1.17	0.56	36.37	12.99
	D1402/3	2.20	0.10	0.68	99.56	1.33	1.17	40.51	13.59
花岗闪长岩	D2404/2	3.97	0.10	0.16	99.67	1.04	1.35	32.67	7.89
	D2404/3	4.29	0.10	0.23	99.78	0.93	1.45	27.16	5.51
	D2404/4	4.23	0.11	0.26	99.69	0.98	1.49	27.22	5.92

样品岩性	样品编号	稀土元素含量/10^-6
样品岩性	样品编号	La	Ce	Pr	Nd	Sm	Eu		Gd		Tb		Dy		Ho
石英闪长斑岩	D1402/1	32.4	62.9	7.24	27.8	5.64	1.42		4.83		0.75		3.35		0.76
	D1402/2	35.8	68.2	8.14	32.3	6.61	1.96		6.12		0.92		5.00		1.12
	D1402/3	43.5	85.8	10.60	42.4	8.88	1.70		8.01		1.43		8.16		1.97
花岗闪长岩	D2404/2	39.3	82.2	10.80	38.5	9.58	1.41		7.96		1.52		8.50		1.85
	D2404/3	47.9	97.5	13.30	45.6	10.60	1.48		9.16		1.68		8.70		2.04
	D2404/4	49.1	99.3	13.30	45.7	10.20	1.50		9.65		1.69		8.61		1.89
样品岩性	样品编号	稀土元素含量/10^-6				特征值
样品岩性	样品编号	Er	Tm	Yb	Lu	δEu		∑REE		(La/Yb)_N		(La/Sm)_N		(Gd/Yb)_N
石英闪长斑岩	D1402/1	1.80	0.27	1.68	0.27	0.81		151.11		13.03		3.62		2.33
	D1402/2	2.52	0.42	2.68	0.39	0.93		172.18		9.03		3.41		1.85
	D1402/3	5.35	0.98	5.77	0.98	0.60		225.53		5.09		3.08		1.13
花岗闪长岩	D2404/2	4.84	0.82	4.94	0.75	0.48		212.97		5.38		2.58		1.31
	D2404/3	5.49	0.88	5.60	0.82	0.45		250.75		5.78		2.84		1.33
	D2404/4	5.11	0.89	5.05	0.77	0.46		252.76		6.57		3.03		1.55

样品岩性	样品编号	稀土元素含量/10^-6
样品岩性	样品编号	La	Ce	Pr	Nd	Sm	Eu		Gd		Tb		Dy		Ho
石英闪长斑岩	D1402/1	32.4	62.9	7.24	27.8	5.64	1.42		4.83		0.75		3.35		0.76
	D1402/2	35.8	68.2	8.14	32.3	6.61	1.96		6.12		0.92		5.00		1.12
	D1402/3	43.5	85.8	10.60	42.4	8.88	1.70		8.01		1.43		8.16		1.97
花岗闪长岩	D2404/2	39.3	82.2	10.80	38.5	9.58	1.41		7.96		1.52		8.50		1.85
	D2404/3	47.9	97.5	13.30	45.6	10.60	1.48		9.16		1.68		8.70		2.04
	D2404/4	49.1	99.3	13.30	45.7	10.20	1.50		9.65		1.69		8.61		1.89
样品岩性	样品编号	稀土元素含量/10^-6				特征值
样品岩性	样品编号	Er	Tm	Yb	Lu	δEu		∑REE		(La/Yb)_N		(La/Sm)_N		(Gd/Yb)_N
石英闪长斑岩	D1402/1	1.80	0.27	1.68	0.27	0.81		151.11		13.03		3.62		2.33
	D1402/2	2.52	0.42	2.68	0.39	0.93		172.18		9.03		3.41		1.85
	D1402/3	5.35	0.98	5.77	0.98	0.60		225.53		5.09		3.08		1.13
花岗闪长岩	D2404/2	4.84	0.82	4.94	0.75	0.48		212.97		5.38		2.58		1.31
	D2404/3	5.49	0.88	5.60	0.82	0.45		250.75		5.78		2.84		1.33
	D2404/4	5.11	0.89	5.05	0.77	0.46		252.76		6.57		3.03		1.55

样品岩性	样品编号	Y	P	Sc	Ti	V	Cr	Zn	Ga	As	Sr	Zr
石英闪长斑岩	D1402/1	20.9	662	12.1	3 053	65.9	40	63.4	15.9	0.5	144	173
	D1402/2	29.3	633	12.3	2 822	46.6	18.6	37.0	15.8	1.1	376	267
	D1402/3	58.1	486	10.4	2 815	60.5	38.1	65.7	15.8	0.5	153	162
花岗闪长岩	D2404/2	47.9	527	8.8	2 140	28.8	11.2	25.5	14.0	1.7	105	222
	D2404/3	52.9	512	4.7	2 139	28.7	10.6	24.4	13.5	1.1	100	221
	D2404/4	49.7	507	7.8	2 180	27.4	11.6	28.7	13.0	0.9	89	241
样品岩性	样品编号	Ba	Pb	Rb	Th	U	Co	Ni	Nb	Ta	K
石英闪长斑岩	D1402/1	502	17.6	140	11.6	1.39	12.7	29.4	15.4	1.12	23 400
	D1402/2	247	10.5	106	8.85	1.62	8.72	11.7	22.4	2.34	8 879
	D1402/3	468	19.5	117	18.2	2.40	12.6	32.4	26.2	1.41	18 255
花岗闪长岩	D2404/2	353	17.2	179	22.0	3.32	4.98	7.18	17.8	1.09	32 943
	D2404/3	347	17.2	178	23.2	3.41	5.46	9.00	21.6	0.92	35 598
	D2404/4	371	14.5	172	20.1	3.36	5.76	9.15	17.2	1.33	35 100