Geochronology, Geochemistry,and Tectonic Significance of Carboniferous Andesite in the Zhongguai Uplift, Northwestern Margin of the Junggar Basin

doi:10.19657/j.geoscience.1000-8527.2022.024

Abstract

Abstract:

To deepen our understanding in the Carboniferous tectonic background in the western Central Asian Orogenic Belt, drill-core samples of andesite in Jinlong 10 well area of Zhongguai uplift (northwestern margin of Junggar basin) were studied via petrography, chronology and geochemistry. The results show that our andesite samples are low-K to medium-K calc-alkaline, with slightly right-inclining REE diagram and weakly negative Eu anomaly. In the primitive mantle-normalized spider diagram, the rocks have Pb and LILE (Rb, Ba) enrichments and HFSE (Nb, Ta, Zr) depletions, resembling those of typical subduction-related arc volcanic rocks. The Th/La, Th/Ce and Lu/Yb ratios of andesite are below those of the average continental crust, but similar to those of typical mantle-derived magmas. The andesite samples belong to the normal island arc volcanic rocks, which are derived from the water-rich mantle wedge and by partial melting of the fluid-metasomatized mantle wedge (produced by subducting-slab dehydration). LA-ICP-MS zircon U-Pb dating of the andesite yielded Middle Carboniferous age of (322.4±1.1) Ma. Combined with regional geological background and compared with coeval magmatism, we considered that the andesite in the Zhongguai uplift was formed in a continental arc setting, and was the subduction product of residual oceanic basin in West Junggar, which was not completely closed at (322.4±1.1) Ma.

Key words: northwestern margin of Junggar Basin, Zhongguai uplift, Carboniferous, andesite, chronology, geochemistry

CLC Number:

P588.1
P597

SHAO Longfei, YU Fusheng, WANG Dandan, LI Chao. Geochronology, Geochemistry,and Tectonic Significance of Carboniferous Andesite in the Zhongguai Uplift, Northwestern Margin of the Junggar Basin[J]. Geoscience, 2022, 36(03): 812-823.

Figures/Tables 11

References 62

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测点号	含量/10^-6			Th/U	同位素比值				年龄/Ma
测点号	Pb	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ		²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ
W19-01	6.57	51.2	108.0	0.47	0.052 2±0.004 6	0.361 8±0.028 5	0.051 3±0.000 9	295±202		314±21.2	323±5.8
W19-02	4.62	36.2	75.3	0.48	0.055 7±0.005 9	0.371 9±0.034 0	0.050 2±0.001 3	439±239		321±25.2	315±8.0
W19-03	15.65	234.0	235.0	1.00	0.053 2±0.002 9	0.367 8±0.020 4	0.049 9±0.000 8	345±124		318±15.1	314±4.8
W19-04	13.35	130.0	206.0	0.63	0.055 0±0.003 4	0.393 3±0.023 5	0.051 9±0.000 7	413±106		337±17.1	326±4.4
W19-05	4.79	48.4	73.7	0.66	0.056 6±0.005 0	0.395 4±0.030 9	0.051 5±0.001 1	476±164		338±22.5	324±6.7
W19-06	8.26	96.9	126.0	0.77	0.054 2±0.003 8	0.376 9±0.023 9	0.050 4±0.000 9	389±159		325±17.6	317±5.6
W19-07	12.60	95.0	208.0	0.46	0.051 9±0.002 7	0.365 1±0.018 4	0.050 7±0.000 8	280±114		316±13.7	319±4.7
W19-08	5.73	68.1	89.2	0.76	0.053 0±0.006 4	0.364 1±0.042 1	0.049 8±0.001 3	332±278		315±31.4	313±7.8
W19-09	11.31	105.0	177.0	0.59	0.052 8±0.003 9	0.373 5±0.026 3	0.051 0±0.000 9	320±167		322±19.5	321±5.4
W19-10	5.16	34.3	84.9	0.40	0.057 3±0.005 1	0.387 4±0.029 8	0.051 9±0.001 1	502±193		332±21.8	326±6.9
W19-11	5.62	56.2	90.5	0.62	0.051 7±0.004 2	0.356 7±0.024 3	0.050 5±0.001 1	333±192		310±18.2	317±6.9
W19-12	5.00	39.5	78.7	0.50	0.052 7±0.004 9	0.371 5±0.033 1	0.052 0±0.001 0	322±218		321±24.5	327±5.9
W19-13	8.21	61.3	130.0	0.47	0.056 6±0.003 7	0.401 7±0.023 6	0.052 0±0.000 8	476±143		343±17.1	327±4.9
W19-14	7.72	77.1	120.0	0.64	0.053 0±0.003 7	0.377 4±0.025 1	0.051 1±0.000 9	332±161		325±18.5	321±5.3
W19-15	4.12	27.3	67.9	0.40	0.053 6±0.004 8	0.367 8±0.026 9	0.051 7±0.001 2	354±202		318±20.0	325±7.7
W19-16	4.27	30.6	70.3	0.44	0.056 1±0.005 3	0.378 4±0.030 3	0.051 1±0.001 2	454±213		326±22.3	321±7.2
W19-17	17.76	175.0	274.0	0.64	0.054 8±0.002 9	0.387 5±0.018 9	0.051 5±0.000 7	406±120		333±13.9	324±4.1
W19-18	10.53	105.0	167.0	0.63	0.052 3±0.003 0	0.366 7±0.020 0	0.050 6±0.000 7	298±130		317±14.9	318±4.3
W19-19^*	58.40	221.0	333.0	0.66	0.065 1±0.001 9	1.267 7±0.036 5	0.140 1±0.001 4	789±61		831±16.4	845±7.7
W19-20	4.54	43.5	69.0	0.63	0.056 8±0.006 1	0.394 7±0.039 0	0.052 2±0.001 2	487±241		338±28.4	328±7.6
W19-21	37.40	498.0	549.0	0.91	0.053 7±0.002 0	0.384 0±0.014 1	0.051 4±0.000 6	367±85		330±10.4	323±3.6
W19-22	14.06	56.7	239.0	0.24	0.056 4±0.003 3	0.399 2±0.022 7	0.051 7±0.000 7	478±130		341±16.4	325±4.3
W19-23	5.66	44.3	89.6	0.49	0.055 7±0.005 0	0.378 3±0.028 8	0.051 8±0.001 0	443±198		326±21.2	325±6.1
W19-24	4.87	47.0	75.9	0.62	0.054 2±0.004 6	0.366 1±0.026 3	0.050 3±0.001 0	389±194		317±19.6	316±6.1
W19-25	8.77	78.5	131.0	0.60	0.058 6±0.004 5	0.413 1±0.025 8	0.053 5±0.000 9	554±167		351±19.0	336±5.7

测点号	含量/10^-6			Th/U	同位素比值				年龄/Ma
测点号	Pb	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ		²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ
W19-01	6.57	51.2	108.0	0.47	0.052 2±0.004 6	0.361 8±0.028 5	0.051 3±0.000 9	295±202		314±21.2	323±5.8
W19-02	4.62	36.2	75.3	0.48	0.055 7±0.005 9	0.371 9±0.034 0	0.050 2±0.001 3	439±239		321±25.2	315±8.0
W19-03	15.65	234.0	235.0	1.00	0.053 2±0.002 9	0.367 8±0.020 4	0.049 9±0.000 8	345±124		318±15.1	314±4.8
W19-04	13.35	130.0	206.0	0.63	0.055 0±0.003 4	0.393 3±0.023 5	0.051 9±0.000 7	413±106		337±17.1	326±4.4
W19-05	4.79	48.4	73.7	0.66	0.056 6±0.005 0	0.395 4±0.030 9	0.051 5±0.001 1	476±164		338±22.5	324±6.7
W19-06	8.26	96.9	126.0	0.77	0.054 2±0.003 8	0.376 9±0.023 9	0.050 4±0.000 9	389±159		325±17.6	317±5.6
W19-07	12.60	95.0	208.0	0.46	0.051 9±0.002 7	0.365 1±0.018 4	0.050 7±0.000 8	280±114		316±13.7	319±4.7
W19-08	5.73	68.1	89.2	0.76	0.053 0±0.006 4	0.364 1±0.042 1	0.049 8±0.001 3	332±278		315±31.4	313±7.8
W19-09	11.31	105.0	177.0	0.59	0.052 8±0.003 9	0.373 5±0.026 3	0.051 0±0.000 9	320±167		322±19.5	321±5.4
W19-10	5.16	34.3	84.9	0.40	0.057 3±0.005 1	0.387 4±0.029 8	0.051 9±0.001 1	502±193		332±21.8	326±6.9
W19-11	5.62	56.2	90.5	0.62	0.051 7±0.004 2	0.356 7±0.024 3	0.050 5±0.001 1	333±192		310±18.2	317±6.9
W19-12	5.00	39.5	78.7	0.50	0.052 7±0.004 9	0.371 5±0.033 1	0.052 0±0.001 0	322±218		321±24.5	327±5.9
W19-13	8.21	61.3	130.0	0.47	0.056 6±0.003 7	0.401 7±0.023 6	0.052 0±0.000 8	476±143		343±17.1	327±4.9
W19-14	7.72	77.1	120.0	0.64	0.053 0±0.003 7	0.377 4±0.025 1	0.051 1±0.000 9	332±161		325±18.5	321±5.3
W19-15	4.12	27.3	67.9	0.40	0.053 6±0.004 8	0.367 8±0.026 9	0.051 7±0.001 2	354±202		318±20.0	325±7.7
W19-16	4.27	30.6	70.3	0.44	0.056 1±0.005 3	0.378 4±0.030 3	0.051 1±0.001 2	454±213		326±22.3	321±7.2
W19-17	17.76	175.0	274.0	0.64	0.054 8±0.002 9	0.387 5±0.018 9	0.051 5±0.000 7	406±120		333±13.9	324±4.1
W19-18	10.53	105.0	167.0	0.63	0.052 3±0.003 0	0.366 7±0.020 0	0.050 6±0.000 7	298±130		317±14.9	318±4.3
W19-19^*	58.40	221.0	333.0	0.66	0.065 1±0.001 9	1.267 7±0.036 5	0.140 1±0.001 4	789±61		831±16.4	845±7.7
W19-20	4.54	43.5	69.0	0.63	0.056 8±0.006 1	0.394 7±0.039 0	0.052 2±0.001 2	487±241		338±28.4	328±7.6
W19-21	37.40	498.0	549.0	0.91	0.053 7±0.002 0	0.384 0±0.014 1	0.051 4±0.000 6	367±85		330±10.4	323±3.6
W19-22	14.06	56.7	239.0	0.24	0.056 4±0.003 3	0.399 2±0.022 7	0.051 7±0.000 7	478±130		341±16.4	325±4.3
W19-23	5.66	44.3	89.6	0.49	0.055 7±0.005 0	0.378 3±0.028 8	0.051 8±0.001 0	443±198		326±21.2	325±6.1
W19-24	4.87	47.0	75.9	0.62	0.054 2±0.004 6	0.366 1±0.026 3	0.050 3±0.001 0	389±194		317±19.6	316±6.1
W19-25	8.77	78.5	131.0	0.60	0.058 6±0.004 5	0.413 1±0.025 8	0.053 5±0.000 9	554±167		351±19.0	336±5.7

样品号	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量
JL10-2	62.2	0.63	14.90	7.09	0.13	2.92	1.86	2.52	2.19	0.13	5.14	94.55
JL101-1	62.5	1.02	14.40	6.48	0.15	2.09	2.97	4.94	1.12	0.38	2.76	96.06
JL102-1	58.2	1.32	14.61	8.67	0.23	2.58	3.40	5.07	0.51	0.35	4.30	94.94
JL102-2	58.8	1.24	14.05	8.33	0.23	2.52	3.64	4.99	0.40	0.33	5.18	94.54
JL103-3	54.3	0.99	16.78	8.79	0.20	5.02	5.24	3.63	0.62	0.18	4.48	95.71
JL104-1	56.2	1.48	15.75	9.30	0.22	2.24	3.00	5.51	1.18	0.35	3.64	95.27
样品号	K₂O/Na₂O	Li	Be	Sc	V	Cr	Co	Cu	Zn	Ga	Rb	Sr
JL10-2	0.87	26.6	1.080	18.1	116.0	34.5	11.9	7.11	74.8	15.1	36.6	322
JL101-1	0.23	16.2	0.922	19.4	47.4	65.2	7.0	12.7	70.3	18.7	25.0	235
JL102-1	0.10	20.5	0.989	27.3	99.6	89.1	12.9	19.8	115.0	20.0	12.5	185
JL102-2	0.08	19.6	0.834	25.1	91.2	91.7	12.0	15.1	112.0	18.7	9.3	180
JL103-3	0.17	19.8	0.552	31.7	226.0	137.0	30.7	112.0	86.8	20.2	10.6	370
JL104-1	0.21	28.6	1.050	32.3	98.7	66.7	12.8	13.7	125.0	22.8	23.5	333
样品号	Y	Cs	Ba	Pb	Th	U	Nb	Ta	Zr	Hf	La	Ce
JL10-2	36.4	0.983	604	3.95	1.43	0.512	2.75	0.238	106.0	3.64	11.6	26.8
JL101-1	42.3	0.348	419	3.30	1.32	0.469	3.37	0.223	95.0	3.06	11.7	27.1
JL102-1	42.9	0.276	123	4.23	1.16	0.455	2.89	0.212	94.4	3.25	11.9	28.7
JL102-2	37.8	0.192	108	3.97	1.05	0.402	2.73	0.194	84.2	2.94	11.0	26.4
JL103-3	26.7	0.359	349	3.63	1.13	0.381	2.37	0.218	96.2	2.99	8.0	18.2
JL104-1	47.9	0.791	338	4.26	1.41	0.473	3.24	0.221	148.0	4.52	12.2	30.1
样品号	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
JL10-2	3.89	18.8	4.94	1.20	4.59	0.95	5.94	1.27	3.5	0.642	3.96	0.580
JL101-1	4.23	21.6	5.86	1.79	5.67	1.17	7.34	1.53	4.19	0.728	4.38	0.587
JL102-1	4.57	23.5	6.31	1.83	6.07	1.26	7.69	1.59	4.09	0.669	4.05	0.537
JL102-2	4.15	21.2	5.62	1.68	5.42	1.12	6.81	1.39	3.57	0.622	3.58	0.497
JL103-3	2.74	13.7	3.70	1.10	3.39	0.70	4.46	0.97	2.58	0.463	2.90	0.427
JL104-1	4.71	24.1	6.52	1.95	6.24	1.31	8.27	1.73	4.61	0.815	4.96	0.709
样品号	REE	LREE	HREE	δEu	Th/La	Th/Ce	Lu/Yb	Nb/La	Ta/Yb	La/Sm	Th/Yb	τ
JL10-2	88.7	67.2	21.4	0.76	0.12	0.05	0.15	0.24	0.06	2.35	0.36	19.73
JL101-1	97.9	72.3	25.6	0.94	0.11	0.05	0.13	0.29	0.05	2.00	0.30	9.31
JL102-1	102.8	76.8	26.0	0.89	0.10	0.04	0.13	0.24	0.05	1.89	0.29	7.23
JL102-2	93.1	70.1	23.0	0.92	0.10	0.04	0.14	0.25	0.05	1.96	0.29	7.32
JL103-3	63.3	47.4	15.9	0.93	0.14	0.06	0.15	0.30	0.08	2.16	0.39	13.26
JL104-1	108.0	79.6	28.6	0.92	0.12	0.05	0.14	0.27	0.04	1.87	0.28	6.93

样品号	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量
JL10-2	62.2	0.63	14.90	7.09	0.13	2.92	1.86	2.52	2.19	0.13	5.14	94.55
JL101-1	62.5	1.02	14.40	6.48	0.15	2.09	2.97	4.94	1.12	0.38	2.76	96.06
JL102-1	58.2	1.32	14.61	8.67	0.23	2.58	3.40	5.07	0.51	0.35	4.30	94.94
JL102-2	58.8	1.24	14.05	8.33	0.23	2.52	3.64	4.99	0.40	0.33	5.18	94.54
JL103-3	54.3	0.99	16.78	8.79	0.20	5.02	5.24	3.63	0.62	0.18	4.48	95.71
JL104-1	56.2	1.48	15.75	9.30	0.22	2.24	3.00	5.51	1.18	0.35	3.64	95.27
样品号	K₂O/Na₂O	Li	Be	Sc	V	Cr	Co	Cu	Zn	Ga	Rb	Sr
JL10-2	0.87	26.6	1.080	18.1	116.0	34.5	11.9	7.11	74.8	15.1	36.6	322
JL101-1	0.23	16.2	0.922	19.4	47.4	65.2	7.0	12.7	70.3	18.7	25.0	235
JL102-1	0.10	20.5	0.989	27.3	99.6	89.1	12.9	19.8	115.0	20.0	12.5	185
JL102-2	0.08	19.6	0.834	25.1	91.2	91.7	12.0	15.1	112.0	18.7	9.3	180
JL103-3	0.17	19.8	0.552	31.7	226.0	137.0	30.7	112.0	86.8	20.2	10.6	370
JL104-1	0.21	28.6	1.050	32.3	98.7	66.7	12.8	13.7	125.0	22.8	23.5	333
样品号	Y	Cs	Ba	Pb	Th	U	Nb	Ta	Zr	Hf	La	Ce
JL10-2	36.4	0.983	604	3.95	1.43	0.512	2.75	0.238	106.0	3.64	11.6	26.8
JL101-1	42.3	0.348	419	3.30	1.32	0.469	3.37	0.223	95.0	3.06	11.7	27.1
JL102-1	42.9	0.276	123	4.23	1.16	0.455	2.89	0.212	94.4	3.25	11.9	28.7
JL102-2	37.8	0.192	108	3.97	1.05	0.402	2.73	0.194	84.2	2.94	11.0	26.4
JL103-3	26.7	0.359	349	3.63	1.13	0.381	2.37	0.218	96.2	2.99	8.0	18.2
JL104-1	47.9	0.791	338	4.26	1.41	0.473	3.24	0.221	148.0	4.52	12.2	30.1
样品号	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
JL10-2	3.89	18.8	4.94	1.20	4.59	0.95	5.94	1.27	3.5	0.642	3.96	0.580
JL101-1	4.23	21.6	5.86	1.79	5.67	1.17	7.34	1.53	4.19	0.728	4.38	0.587
JL102-1	4.57	23.5	6.31	1.83	6.07	1.26	7.69	1.59	4.09	0.669	4.05	0.537
JL102-2	4.15	21.2	5.62	1.68	5.42	1.12	6.81	1.39	3.57	0.622	3.58	0.497
JL103-3	2.74	13.7	3.70	1.10	3.39	0.70	4.46	0.97	2.58	0.463	2.90	0.427
JL104-1	4.71	24.1	6.52	1.95	6.24	1.31	8.27	1.73	4.61	0.815	4.96	0.709
样品号	REE	LREE	HREE	δEu	Th/La	Th/Ce	Lu/Yb	Nb/La	Ta/Yb	La/Sm	Th/Yb	τ
JL10-2	88.7	67.2	21.4	0.76	0.12	0.05	0.15	0.24	0.06	2.35	0.36	19.73
JL101-1	97.9	72.3	25.6	0.94	0.11	0.05	0.13	0.29	0.05	2.00	0.30	9.31
JL102-1	102.8	76.8	26.0	0.89	0.10	0.04	0.13	0.24	0.05	1.89	0.29	7.23
JL102-2	93.1	70.1	23.0	0.92	0.10	0.04	0.14	0.25	0.05	1.96	0.29	7.32
JL103-3	63.3	47.4	15.9	0.93	0.14	0.06	0.15	0.30	0.08	2.16	0.39	13.26
JL104-1	108.0	79.6	28.6	0.92	0.12	0.05	0.14	0.27	0.04	1.87	0.28	6.93