Late Silurian to Early Devonian Tectonic Evolution of Beishanyang: Constraints from Geochronology and Geochemistry of Intrusive Rocks in Southern Baiyunshan Ophiolitic Mélange Belt, Inner Mongolia

doi:10.19657/j.geoscience.1000-8527.2021.069

Abstract

Abstract:

Intermediate-felsic intrusive rocks occur mainly as dykes in the southern part of the Baiyunshan ophiolite mélange belt in the Beishan Orogen, Inner Mongolia. LA-ICP-MS zircon U-Pb dating and whole-rock geochemical analysis were performed to study the rock type, geochronology and tectonic setting of the dykes. Meanwhile, it provides chronological constraints for the timing of the Beishan ocean closure. The results show that the intermediate-felsic dykes have SiO₂=58.38%-69.46%, K₂O=0.74%-1.38%, Al₂O₃=15.54%-16.95%, and Na₂O=4.15%-5.36%. The rocks are calc-alkaline quartz diorite and peraluminous tholeiitic granodiorite. Zircon U-Pb ages of the quartz diorite and granodiorite are (420.0±1.0) Ma and (404.6±2.6) Ma, respectively, suggesting the dykes were intruded in the Late Silurian-Early Devonian. The quartz diorite and granodiorite were likely derived from a continental-margin volcanic arc and syn-collisional setting. The clear LREE/HREE enrichments and high field strength element (HFSE, e.g., Ta and Nb) depletions are typical of island arc affinity, which shows the occurrence of island arc magmatism in the Late Silurian-Early Devonian led by oceanic crust subduction. With the progress of subduction, the Beishan ocean may have closed completely in the Late Silurian-Early Devonian to form syn-collisional granites in the study area. The collision time should be before (404.6±2.6) Ma.

Key words: Baiyunshan, Inner Mongolia, volcano arc collision, intermediate-felsic dyke, geochronology, geochemistry

CLC Number:

CHENG Xianyu, TIAN Jian, DUAN Xiaolong, ZHAO Zenan, REN Bangfang, ZHANG Yong. Late Silurian to Early Devonian Tectonic Evolution of Beishanyang: Constraints from Geochronology and Geochemistry of Intrusive Rocks in Southern Baiyunshan Ophiolitic Mélange Belt, Inner Mongolia[J]. Geoscience, 2022, 36(01): 295-306.

Figures/Tables 9

References 45

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样品号及点号	含量/10^-6		Th/U	同位素比值				年龄/Ma
样品号及点号	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ		²⁰⁶Pb/²³⁸U ±1σ	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ
TW3422.1	379	429	0.88	0.055 2±0.000 6		0.510 2±0.007 3	0.067 1±0.000 7	420±26	419±6	418±5
TW3422.2	396	448	0.88	0.055 3±0.000 6		0.511 3±0.006 7	0.067 0±0.000 7	426±26	419±6	418±4
TW3422.3	1 055	977	1.08	0.055 0±0.000 6		0.511 5±0.006 9	0.067 4±0.000 7	413±25	419±6	421±4
TW3422.4	675	625	1.08	0.055 6±0.000 7		0.513 6±0.007 2	0.067 0±0.000 6	436±28	421±6	418±4
TW3422.5	377	450	0.84	0.054 6±0.000 6		0.512 5±0.007 0	0.068 0±0.000 7	397±27	420±6	424±4
TW3422.6	315	365	0.86	0.055 7±0.000 7		0.519 8±0.008 5	0.067 7±0.000 8	441±28	425±7	422±5
TW3422.7	909	858	1.06	0.054 4±0.000 6		0.508 4±0.007 0	0.067 7±0.000 7	390±25	417±6	422±5
TW3422.8	465	467	1.00	0.055 4±0.000 6		0.512 2±0.007 1	0.067 1±0.000 7	428±26	420±6	418±5
TW3422.9	88	173	0.51	0.055 4±0.001 0		0.513 4±0.010 0	0.067 2±0.000 7	428±39	421±8	419±5
TW3422.10	353	446	0.79	0.054 8±0.000 6		0.509 8±0.006 8	0.067 5±0.000 7	403±26	418±6	421±4
TW3422.11	268	362	0.74	0.055 1±0.000 7		0.512 5±0.007 0	0.067 5±0.000 7	415±26	420±6	421±4
TW3422.12	440	367	1.20	0.054 9±0.002 1		0.512 2±0.021 2	0.067 7±0.000 8	406±86	420±17	422±5
TW3422.13	349	390	0.89	0.054 9±0.000 7		0.510 2±0.007 1	0.067 4±0.000 7	408±28	419±6	420±4
TW3422.14	450	513	0.88	0.054 9±0.000 6		0.511 0±0.006 8	0.067 5±0.000 7	408±26	419±6	421±4
TW3422.15	340	461	0.74	0.054 5±0.000 6		0.508 3±0.007 0	0.067 7±0.000 7	390±26	417±6	422±4
TW3422.16	396	527	0.75	0.054 6±0.000 6		0.507 9±0.007 4	0.067 5±0.000 8	395±26	417±6	421±5
TW3422.17	463	461	1.00	0.055 7±0.000 7		0.515 6±0.007 1	0.067 2±0.000 7	440±26	422±6	419±4
TW3422.18	140	240	0.59	0.055 0±0.001 1		0.510 3±0.012 8	0.067 3±0.000 8	410±43	419±11	420±5
TW3422.19	358	365	0.98	0.055 0±0.000 7		0.509 6±0.007 4	0.067 2±0.000 7	413±27	418±6	419±4
TW3422.20	359	338	1.06	0.054 8±0.000 7		0.509 3±0.007 4	0.067 4±0.000 7	404±28	418±6	420±4
TW3422.21	264	366	0.72	0.055 2±0.000 7		0.508 4±0.007 1	0.066 8±0.000 7	420±27	417±6	417±4
TW3422.22	382	417	0.92	0.054 9±0.000 6		0.507 5±0.006 9	0.067 0±0.000 7	410±26	417±6	418±4
TW3422.23	948	891	1.06	0.055 5±0.000 6		0.512 0±0.007 0	0.066 9±0.000 7	433±25	420±6	417±5
TW3422.24	395	528	0.75	0.055 5±0.000 6		0.512 2±0.006 8	0.067 0±0.000 7	431±26	420±6	418±4
TW3424-1.01	15	36	0.41	0.053 5±0.004 3		0.491 9±0.040 2	0.066 6±0.000 8	351±181	406±33	416±4
TW3424-1.02	39	59	0.66	0.055 2±0.002 7		0.493 3±0.024 2	0.064 8±0.000 7	419±108	407±20	405±4
TW3424-1.03	13	27	0.47	0.056 6±0.005 0		0.510 5±0.045 4	0.065 4±0.000 8	476±195	419±37	409±5
TW3424-1.04	17	30	0.56	0.055 3±0.004 1		0.495 0±0.036 8	0.065 0±0.000 7	423±166	408±30	406±5
TW3424-1.05	11	23	0.50	0.056 7±0.007 3		0.472 4±0.061 2	0.060 4±0.000 9	481±286	393±51	378±6
TW3424-1.06	31	50	0.62	0.053 0±0.002 5		0.482 3±0.023 5	0.066 0±0.000 7	330±108	400±19	412±4
TW3424-1.07	21	44	0.49	0.056 1±0.002 9		0.506 2±0.026 5	0.065 5±0.000 7	454±113	416±22	409±4
TW3424-1.08	13	28	0.45	0.053 8±0.004 6		0.498 6±0.043 0	0.067 2±0.000 8	364±192	411±35	419±5
TW3424-1.09	10	29	0.36	0.055 6±0.005 8		0.488 8±0.049 8	0.063 8±0.000 8	435±232	404±41	399±5
TW3424-1.10	17	40	0.44	0.057 5±0.004 1		0.509 5±0.035 6	0.064 2±0.000 7	512±156	418±29	401±5
TW3424-1.11	108	67	1.61	0.055 2±0.005 0		0.428 0±0.039 0	0.056 2±0.000 6	421±201	362±33	353±4
TW3424-1.12	30	42	0.71	0.055 4±0.003 5		0.494 2±0.031 3	0.064 7±0.000 7	427±141	408±26	404±4
样品号及点号	含量/10^-6		Th/U	同位素比值				年龄/Ma
样品号及点号	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ		²⁰⁶Pb/²³⁸U ±1σ	²⁰⁶Pb/²³⁸U ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁷Pb/²⁰⁶Pb ±1σ
TW3424-1.13	16	39	0.41	0.053 8±0.004 1		0.486 0±0.037 9	0.065 5±0.000 7	364±174	402±31	409±5
TW3424-1.14	19	44	0.43	0.056 0±0.003 1		0.502 0±0.028 6	0.065 0±0.000 7	454±124	413±24	406±5
TW3424-1.15	32	55	0.59	0.054 5±0.002 4		0.479 8±0.021 2	0.063 8±0.000 7	393±97	398±18	399±4
TW3424-1.16	30	51	0.59	0.056 2±0.002 4		0.490 3±0.021 1	0.063 3±0.000 7	459±94	405±17	396±4
TW3424-1.17	18	47	0.39	0.053 9±0.002 6		0.487 5±0.024 3	0.065 6±0.000 7	368±109	403±20	409±4
TW3424-1.18	14	35	0.41	0.056 3±0.003 6		0.487 5±0.031 9	0.062 8±0.000 7	465±143	403±26	392±4
TW3424-1.19	14	33	0.44	0.053 5±0.004 1		0.473 4±0.036 0	0.064 2±0.000 7	351±172	394±30	401±5
TW3424-1.20	28	45	0.63	0.053 9±0.003 1		0.475 5±0.028 3	0.064 0±0.000 8	366±131	395±24	400±5
TW3424-1.21	29	50	0.57	0.054 4±0.002 9		0.479 5±0.026 2	0.063 9±0.000 7	387±121	398±22	400±4
TW3424-1.22	27	44	0.61	0.054 2±0.003 0		0.491 8±0.027 4	0.065 8±0.000 7	381±124	406±23	411±4
TW3424-1.23	28	68	0.41	0.053 5±0.001 9		0.481 9±0.017 6	0.065 3±0.000 7	352±80	399±15	408±4
TW3424-1.24	22	59	0.38	0.054 0±0.002 5		0.486 7±0.022 9	0.065 3±0.000 7	373±103	403±19	408±4

样品号及点号	含量/10^-6		Th/U	同位素比值				年龄/Ma
样品号及点号	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ		²⁰⁶Pb/²³⁸U ±1σ	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ
TW3422.1	379	429	0.88	0.055 2±0.000 6		0.510 2±0.007 3	0.067 1±0.000 7	420±26	419±6	418±5
TW3422.2	396	448	0.88	0.055 3±0.000 6		0.511 3±0.006 7	0.067 0±0.000 7	426±26	419±6	418±4
TW3422.3	1 055	977	1.08	0.055 0±0.000 6		0.511 5±0.006 9	0.067 4±0.000 7	413±25	419±6	421±4
TW3422.4	675	625	1.08	0.055 6±0.000 7		0.513 6±0.007 2	0.067 0±0.000 6	436±28	421±6	418±4
TW3422.5	377	450	0.84	0.054 6±0.000 6		0.512 5±0.007 0	0.068 0±0.000 7	397±27	420±6	424±4
TW3422.6	315	365	0.86	0.055 7±0.000 7		0.519 8±0.008 5	0.067 7±0.000 8	441±28	425±7	422±5
TW3422.7	909	858	1.06	0.054 4±0.000 6		0.508 4±0.007 0	0.067 7±0.000 7	390±25	417±6	422±5
TW3422.8	465	467	1.00	0.055 4±0.000 6		0.512 2±0.007 1	0.067 1±0.000 7	428±26	420±6	418±5
TW3422.9	88	173	0.51	0.055 4±0.001 0		0.513 4±0.010 0	0.067 2±0.000 7	428±39	421±8	419±5
TW3422.10	353	446	0.79	0.054 8±0.000 6		0.509 8±0.006 8	0.067 5±0.000 7	403±26	418±6	421±4
TW3422.11	268	362	0.74	0.055 1±0.000 7		0.512 5±0.007 0	0.067 5±0.000 7	415±26	420±6	421±4
TW3422.12	440	367	1.20	0.054 9±0.002 1		0.512 2±0.021 2	0.067 7±0.000 8	406±86	420±17	422±5
TW3422.13	349	390	0.89	0.054 9±0.000 7		0.510 2±0.007 1	0.067 4±0.000 7	408±28	419±6	420±4
TW3422.14	450	513	0.88	0.054 9±0.000 6		0.511 0±0.006 8	0.067 5±0.000 7	408±26	419±6	421±4
TW3422.15	340	461	0.74	0.054 5±0.000 6		0.508 3±0.007 0	0.067 7±0.000 7	390±26	417±6	422±4
TW3422.16	396	527	0.75	0.054 6±0.000 6		0.507 9±0.007 4	0.067 5±0.000 8	395±26	417±6	421±5
TW3422.17	463	461	1.00	0.055 7±0.000 7		0.515 6±0.007 1	0.067 2±0.000 7	440±26	422±6	419±4
TW3422.18	140	240	0.59	0.055 0±0.001 1		0.510 3±0.012 8	0.067 3±0.000 8	410±43	419±11	420±5
TW3422.19	358	365	0.98	0.055 0±0.000 7		0.509 6±0.007 4	0.067 2±0.000 7	413±27	418±6	419±4
TW3422.20	359	338	1.06	0.054 8±0.000 7		0.509 3±0.007 4	0.067 4±0.000 7	404±28	418±6	420±4
TW3422.21	264	366	0.72	0.055 2±0.000 7		0.508 4±0.007 1	0.066 8±0.000 7	420±27	417±6	417±4
TW3422.22	382	417	0.92	0.054 9±0.000 6		0.507 5±0.006 9	0.067 0±0.000 7	410±26	417±6	418±4
TW3422.23	948	891	1.06	0.055 5±0.000 6		0.512 0±0.007 0	0.066 9±0.000 7	433±25	420±6	417±5
TW3422.24	395	528	0.75	0.055 5±0.000 6		0.512 2±0.006 8	0.067 0±0.000 7	431±26	420±6	418±4
TW3424-1.01	15	36	0.41	0.053 5±0.004 3		0.491 9±0.040 2	0.066 6±0.000 8	351±181	406±33	416±4
TW3424-1.02	39	59	0.66	0.055 2±0.002 7		0.493 3±0.024 2	0.064 8±0.000 7	419±108	407±20	405±4
TW3424-1.03	13	27	0.47	0.056 6±0.005 0		0.510 5±0.045 4	0.065 4±0.000 8	476±195	419±37	409±5
TW3424-1.04	17	30	0.56	0.055 3±0.004 1		0.495 0±0.036 8	0.065 0±0.000 7	423±166	408±30	406±5
TW3424-1.05	11	23	0.50	0.056 7±0.007 3		0.472 4±0.061 2	0.060 4±0.000 9	481±286	393±51	378±6
TW3424-1.06	31	50	0.62	0.053 0±0.002 5		0.482 3±0.023 5	0.066 0±0.000 7	330±108	400±19	412±4
TW3424-1.07	21	44	0.49	0.056 1±0.002 9		0.506 2±0.026 5	0.065 5±0.000 7	454±113	416±22	409±4
TW3424-1.08	13	28	0.45	0.053 8±0.004 6		0.498 6±0.043 0	0.067 2±0.000 8	364±192	411±35	419±5
TW3424-1.09	10	29	0.36	0.055 6±0.005 8		0.488 8±0.049 8	0.063 8±0.000 8	435±232	404±41	399±5
TW3424-1.10	17	40	0.44	0.057 5±0.004 1		0.509 5±0.035 6	0.064 2±0.000 7	512±156	418±29	401±5
TW3424-1.11	108	67	1.61	0.055 2±0.005 0		0.428 0±0.039 0	0.056 2±0.000 6	421±201	362±33	353±4
TW3424-1.12	30	42	0.71	0.055 4±0.003 5		0.494 2±0.031 3	0.064 7±0.000 7	427±141	408±26	404±4
样品号及点号	含量/10^-6		Th/U	同位素比值				年龄/Ma
样品号及点号	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ		²⁰⁶Pb/²³⁸U ±1σ	²⁰⁶Pb/²³⁸U ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁷Pb/²⁰⁶Pb ±1σ
TW3424-1.13	16	39	0.41	0.053 8±0.004 1		0.486 0±0.037 9	0.065 5±0.000 7	364±174	402±31	409±5
TW3424-1.14	19	44	0.43	0.056 0±0.003 1		0.502 0±0.028 6	0.065 0±0.000 7	454±124	413±24	406±5
TW3424-1.15	32	55	0.59	0.054 5±0.002 4		0.479 8±0.021 2	0.063 8±0.000 7	393±97	398±18	399±4
TW3424-1.16	30	51	0.59	0.056 2±0.002 4		0.490 3±0.021 1	0.063 3±0.000 7	459±94	405±17	396±4
TW3424-1.17	18	47	0.39	0.053 9±0.002 6		0.487 5±0.024 3	0.065 6±0.000 7	368±109	403±20	409±4
TW3424-1.18	14	35	0.41	0.056 3±0.003 6		0.487 5±0.031 9	0.062 8±0.000 7	465±143	403±26	392±4
TW3424-1.19	14	33	0.44	0.053 5±0.004 1		0.473 4±0.036 0	0.064 2±0.000 7	351±172	394±30	401±5
TW3424-1.20	28	45	0.63	0.053 9±0.003 1		0.475 5±0.028 3	0.064 0±0.000 8	366±131	395±24	400±5
TW3424-1.21	29	50	0.57	0.054 4±0.002 9		0.479 5±0.026 2	0.063 9±0.000 7	387±121	398±22	400±4
TW3424-1.22	27	44	0.61	0.054 2±0.003 0		0.491 8±0.027 4	0.065 8±0.000 7	381±124	406±23	411±4
TW3424-1.23	28	68	0.41	0.053 5±0.001 9		0.481 9±0.017 6	0.065 3±0.000 7	352±80	399±15	408±4
TW3424-1.24	22	59	0.38	0.054 0±0.002 5		0.486 7±0.022 9	0.065 3±0.000 7	373±103	403±19	408±4

样品号	岩性	SiO₂	Al₂O₃	Fe₂O₃	FeO	CaO	MgO	K₂O	Na₂O	TiO₂	P₂O₅	MnO	烧失量
YQ3422-1	石英闪长岩	58.46	16.83	1.82	4.36	5.74	3.33	1.38	4.15	1.29	0.23	0.11	1.81
YQ3422-2	石英闪长岩	58.38	16.95	2.05	4.52	5.41	3.21	1.31	4.34	1.21	0.24	0.12	1.78
YQ3424-1	花岗闪长岩	69.20	15.72	1.30	1.20	2.66	1.59	0.74	5.36	0.32	0.08	0.06	1.64
YQ3424-2	花岗闪长岩	69.46	15.54	1.04	1.31	2.76	1.50	0.84	5.32	0.34	0.08	0.04	1.62
样品号	岩性	总量	Na₂O+K₂O	Na₂O/K₂O	Cu	Pb	Zn	Cr	Ni	Co	Li	Rb	Cs
YQ3422-1	石英闪长岩	99.51	5.53	3.01	12.90	7.10	57.8	34.7	16.00	20.50	20.20	33.1	1.55
YQ3422-2	石英闪长岩	99.52	5.65	3.31	24.90	7.74	75.7	29.1	13.90	20.50	14.40	40.3	1.88
YQ3424-1	花岗闪长岩	99.87	6.10	7.24	2.87	3.90	27.0	19.5	9.26	6.62	5.87	23.3	3.20
YQ3424-2	花岗闪长岩	99.85	6.16	6.33	3.11	3.72	26.6	18.1	8.81	6.42	5.23	29.8	2.82
样品号	岩性	Bi	Sr	Ba	V	Sc	Y	Nb	Ta	Zr	Hf	Be	Ga
YQ3422-1	石英闪长岩	0.028	301	278	129.0	16.60	28.50	7.29	0.68	205	5.86	1.51	19.1
YQ3422-2	石英闪长岩	0.027	304	297	137.0	14.80	26.90	6.13	0.58	114	3.58	1.52	19.0
YQ3424-1	花岗闪长岩	0.015	303	99	32.9	2.25	7.47	2.27	0.21	159	4.05	0.84	13.4
YQ3424-2	花岗闪长岩	0.016	276	123	33.5	2.36	7.46	2.39	0.22	128	3.81	1.00	13.3
样品号	岩性	U	Th	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho
YQ3422-1	石英闪长岩	1.15	4.87	17.00	36.3	5.10	22.00	5.20	1.36	5.90	0.97	5.78	1.12
YQ3422-2	石英闪长岩	0.91	3.89	15.80	32.9	4.72	20.50	4.97	1.47	5.53	0.90	5.39	1.05
YQ3424-1	花岗闪长岩	0.51	1.78	6.30	14.2	1.83	7.54	1.73	0.50	1.79	0.28	1.51	0.30
YQ3424-2	花岗闪长岩	0.58	2.01	6.29	13.3	1.75	7.10	1.59	0.52	1.72	0.26	1.52	0.28
样品号	岩性	Er	Tm	Yb	Lu	REE	LREE	HREE	LREE/HREE	δEu	δCe	(La/Yb)_N
YQ3422-1	石英闪长岩	3.04	0.43	2.95	0.45	107.6	86.96	20.64	4.21	0.75	0.96	4.13
YQ3422-2	石英闪长岩	2.81	0.40	2.69	0.40	99.53	80.36	19.17	4.19	0.86	0.93	4.21
YQ3424-1	花岗闪长岩	0.74	0.11	0.70	0.11	37.64	32.10	5.54	5.79	0.87	1.03	6.46
YQ3424-2	花岗闪长岩	0.74	0.11	0.75	0.11	36.04	30.55	5.49	5.56	0.96	0.98	6.02

样品号	岩性	SiO₂	Al₂O₃	Fe₂O₃	FeO	CaO	MgO	K₂O	Na₂O	TiO₂	P₂O₅	MnO	烧失量
YQ3422-1	石英闪长岩	58.46	16.83	1.82	4.36	5.74	3.33	1.38	4.15	1.29	0.23	0.11	1.81
YQ3422-2	石英闪长岩	58.38	16.95	2.05	4.52	5.41	3.21	1.31	4.34	1.21	0.24	0.12	1.78
YQ3424-1	花岗闪长岩	69.20	15.72	1.30	1.20	2.66	1.59	0.74	5.36	0.32	0.08	0.06	1.64
YQ3424-2	花岗闪长岩	69.46	15.54	1.04	1.31	2.76	1.50	0.84	5.32	0.34	0.08	0.04	1.62
样品号	岩性	总量	Na₂O+K₂O	Na₂O/K₂O	Cu	Pb	Zn	Cr	Ni	Co	Li	Rb	Cs
YQ3422-1	石英闪长岩	99.51	5.53	3.01	12.90	7.10	57.8	34.7	16.00	20.50	20.20	33.1	1.55
YQ3422-2	石英闪长岩	99.52	5.65	3.31	24.90	7.74	75.7	29.1	13.90	20.50	14.40	40.3	1.88
YQ3424-1	花岗闪长岩	99.87	6.10	7.24	2.87	3.90	27.0	19.5	9.26	6.62	5.87	23.3	3.20
YQ3424-2	花岗闪长岩	99.85	6.16	6.33	3.11	3.72	26.6	18.1	8.81	6.42	5.23	29.8	2.82
样品号	岩性	Bi	Sr	Ba	V	Sc	Y	Nb	Ta	Zr	Hf	Be	Ga
YQ3422-1	石英闪长岩	0.028	301	278	129.0	16.60	28.50	7.29	0.68	205	5.86	1.51	19.1
YQ3422-2	石英闪长岩	0.027	304	297	137.0	14.80	26.90	6.13	0.58	114	3.58	1.52	19.0
YQ3424-1	花岗闪长岩	0.015	303	99	32.9	2.25	7.47	2.27	0.21	159	4.05	0.84	13.4
YQ3424-2	花岗闪长岩	0.016	276	123	33.5	2.36	7.46	2.39	0.22	128	3.81	1.00	13.3
样品号	岩性	U	Th	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho
YQ3422-1	石英闪长岩	1.15	4.87	17.00	36.3	5.10	22.00	5.20	1.36	5.90	0.97	5.78	1.12
YQ3422-2	石英闪长岩	0.91	3.89	15.80	32.9	4.72	20.50	4.97	1.47	5.53	0.90	5.39	1.05
YQ3424-1	花岗闪长岩	0.51	1.78	6.30	14.2	1.83	7.54	1.73	0.50	1.79	0.28	1.51	0.30
YQ3424-2	花岗闪长岩	0.58	2.01	6.29	13.3	1.75	7.10	1.59	0.52	1.72	0.26	1.52	0.28
样品号	岩性	Er	Tm	Yb	Lu	REE	LREE	HREE	LREE/HREE	δEu	δCe	(La/Yb)_N
YQ3422-1	石英闪长岩	3.04	0.43	2.95	0.45	107.6	86.96	20.64	4.21	0.75	0.96	4.13
YQ3422-2	石英闪长岩	2.81	0.40	2.69	0.40	99.53	80.36	19.17	4.19	0.86	0.93	4.21
YQ3424-1	花岗闪长岩	0.74	0.11	0.70	0.11	37.64	32.10	5.54	5.79	0.87	1.03	6.46
YQ3424-2	花岗闪长岩	0.74	0.11	0.75	0.11	36.04	30.55	5.49	5.56	0.96	0.98	6.02