Ancient Crust Remelting in Wenquan Area, Xinjiang: Evidence from the Age and Sr-Nd Isotopes of the Late Carboniferous Granite Porphyry Dykes

doi:10.19657/j.geoscience.1000-8527.2022.013

Abstract

Abstract:

Dyke swarms with complex lithology are distributed on the southern margin of the Alataw Mountains (some closely ore-related), providing a good window to understand the crustal growth process. Numerous intermediate-felsic dykes are exposed in the western section, which intruded the Upper Devonian Tuskuertau Formation. These dykes are dominated by diorite with minor granite porphyry and felsite. We carried out zircon U-Pb age and Sr-Nd dating on the granite porphyry dyke to reveal its formation age, magma source and tectonic setting. The zircon U-Pb dating yielded weighted average age of 310 Ma, indicating that the granite porphyry dykes were formed in the early Late Carboniferous. This age is very close to the eruption age (310 Ma) of the Shawan intraplate rhyolite formed under an extensional environment and the formation age of the Chahawusu batholith (313 Ma), which is the product of the latest magmatism in the western Alataw Mountains. The Sr-Nd isotopic compositions indicate that the dykes are featured by medium I_Sr (0.709,328-0.710,018) and negative ε_Nd(t) (-3.92 to -2.33) values and older Nd model age (1,294-1,502 Ma), which are obviously different from those of coeval granitoids in the western Tianshan and northern Xinjiang. The latter has generally low I_Sr and highly positive ε_Nd(t) values and younger Nd isotope model ages, and were likely derived from the mantle, and underwent magma underplating and ACF or magma mixing processes. After 310 Ma, the Alataw Mountains gradually entered a post-collision extension stage, which was in a vertical growth of continental crust. We conclude that the granite porphyry dykes were unlikely to be formed by mantle-derived magma underplating and evolution, and the magma source is the Precambrian basement rock with relatively high maturity. The dykes may have formed in a post-collision extensional setting.

Key words: granite porphyry, emplacement age, isotope composition, basement rock, Wenquan area

CLC Number:

YANG Hanwen, WANG Jianzhong, ZHAO Jun, DUAN Jun, WANG Rongmin, GAO Wenbin, WEI Wenhao, ZHENG Yanhe. Ancient Crust Remelting in Wenquan Area, Xinjiang: Evidence from the Age and Sr-Nd Isotopes of the Late Carboniferous Granite Porphyry Dykes[J]. Geoscience, 2022, 36(03): 824-835.

Figures/Tables 9

References 59

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测点	Pb /10^-6	²³²Th /10^-6	²³⁸U /10^-6	Th/U	同位素比值				同位素年龄/Ma			不谐和度 /%
					同位素比值				²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ
					²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ		²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ
1	72	411	1 186	0.35	0.052 2±0.002 9	0.380 0±0.020 7	0.052 8±0.000 9	294±122		327±15	331.4±5.4	-1.3
6	76	469	1 365	0.34	0.054 3±0.002 2	0.366 3±0.014 7	0.048 8±0.000 7	385±88		317±11	307.3±4.4	3.0
7	61	440	1 074	0.41	0.052 3±0.002 4	0.346 7±0.015 6	0.048 0±0.000 7	299±101		302±12	302.3±4.5	0.0
8	107	1 567	1 176	1.33	0.051 4±0.002 5	0.454 4±0.021 8	0.064 1±0.001 0	259±108		380±15	400.2±5.8	-5.2
10	50	162	928	0.17	0.051 9±0.002 4	0.352 2±0.016 3	0.049 2±0.000 8	281±104		306±12	309.4±4.7	-1.0
11	92	500	1 708	0.29	0.052 2±0.001 8	0.339 9±0.011 4	0.047 1±0.000 6	296±75		297±9	296.9±4.0	0.1
12	70	393	1 259	0.31	0.051 9±0.002 1	0.346 3±0.013 8	0.048 4±0.000 7	279±89		302±10	304.5±4.3	-0.9
13	16	101	289	0.35	0.051 0±0.004 5	0.344 2±0.030 1	0.048 9±0.001 0	242±192		300±23	307.5±6.3	-2.4
14	36	286	661	0.43	0.049 2±0.002 7	0.315 2±0.017 1	0.046 4±0.000 8	158±124		278±13	292.2±4.7	-5.0
15	43	255	555	0.46	0.055 6±0.002 8	0.502 9±0.024 7	0.065 5±0.001 1	437±108		414±17	408.9±6.4	1.2
16	83	443	1 502	0.29	0.053 2±0.001 8	0.358 1±0.012 0	0.048 7±0.000 7	338±75		311±9	306.7±4.1	1.3
17	41	250	474	0.53	0.055 4±0.002 8	0.539 4±0.026 7	0.070 5±0.001 1	429±108		438±18	439.0±6.9	-0.2
18	57	378	571	0.66	0.064 1±0.002 8	0.700 3±0.030 3	0.079 1±0.001 2	745±90		539±18	490.9±7.3	8.9
20	83	334	1 652	0.20	0.054 3±0.0024	0.337 6±0.014 6	0.045 0±0.000 7	383±96		295±11	283.9±4.3	3.9
21	56	361	885	0.41	0.052 4±0.002 2	0.393 1±0.016 0	0.054 3±0.000 8	304±91		337±12	340.7±4.8	-1.2
22	129	161	2 383	0.07	0.052 4±0.001 4	0.365 8±0.009 9	0.050 6±0.000 7	302±60		317±7	318.0±4.0	-0.4
23	61	31	1 153	0.03	0.051 4±0.002 0	0.356 6±0.013 5	0.050 2±0.000 7	258±85		310±10	316.0±4.3	-2.0
24	65	571	790	0.72	0.055 4±0.002 2	0.485 5±0.019 1	0.063 5±0.000 9	428±86		402±13	396.6±5.6	1.3
25	33	81	566	0.14	0.056 6±0.003 1	0.401 2±0.021 8	0.051 4±0.000 9	473±118		343±16	322.9±5.3	5.7
26	63	610	1 024	0.60	0.053 0±0.002 1	0.361 9±0.014 2	0.049 5±0.000 7	327±88		314±11	311.2±4.4	0.8
29	74	412	1 278	0.32	0.059 1±0.002 1	0.402 7±0.013 9	0.049 3±0.000 7	572±74		344±10	310.1±4.2	9.7
30	52	303	964	0.31	0.052 7±0.002 2	0.343 5±0.014 2	0.047 2±0.000 7	315±92		300±11	297.3±4.2	0.9
31	164	1 111	2 211	0.50	0.055 6±0.001 3	0.472 5±0.011 2	0.061 5±0.000 8	435±52		393±8	384.9±4.7	2.0
32	109	301	1 939	0.16	0.051 6±0.001 4	0.369 0±0.010 1	0.051 7±0.000 7	270±62		319±8	325.0±4.1	-1.9
33	62	354	1 086	0.33	0.051 4±0.001 9	0.349 3±0.013 0	0.049 1±0.000 7	261±84		304±10	309.2±4.2	-1.6
35	61	270	1 044	0.26	0.054 6±0.002 0	0.388 6±0.014 2	0.051 5±0.000 7	396±80		333±10	323.7±4.5	2.9

测点	Pb /10^-6	²³²Th /10^-6	²³⁸U /10^-6	Th/U	同位素比值				同位素年龄/Ma			不谐和度 /%
					同位素比值				²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ
					²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ		²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ
1	72	411	1 186	0.35	0.052 2±0.002 9	0.380 0±0.020 7	0.052 8±0.000 9	294±122		327±15	331.4±5.4	-1.3
6	76	469	1 365	0.34	0.054 3±0.002 2	0.366 3±0.014 7	0.048 8±0.000 7	385±88		317±11	307.3±4.4	3.0
7	61	440	1 074	0.41	0.052 3±0.002 4	0.346 7±0.015 6	0.048 0±0.000 7	299±101		302±12	302.3±4.5	0.0
8	107	1 567	1 176	1.33	0.051 4±0.002 5	0.454 4±0.021 8	0.064 1±0.001 0	259±108		380±15	400.2±5.8	-5.2
10	50	162	928	0.17	0.051 9±0.002 4	0.352 2±0.016 3	0.049 2±0.000 8	281±104		306±12	309.4±4.7	-1.0
11	92	500	1 708	0.29	0.052 2±0.001 8	0.339 9±0.011 4	0.047 1±0.000 6	296±75		297±9	296.9±4.0	0.1
12	70	393	1 259	0.31	0.051 9±0.002 1	0.346 3±0.013 8	0.048 4±0.000 7	279±89		302±10	304.5±4.3	-0.9
13	16	101	289	0.35	0.051 0±0.004 5	0.344 2±0.030 1	0.048 9±0.001 0	242±192		300±23	307.5±6.3	-2.4
14	36	286	661	0.43	0.049 2±0.002 7	0.315 2±0.017 1	0.046 4±0.000 8	158±124		278±13	292.2±4.7	-5.0
15	43	255	555	0.46	0.055 6±0.002 8	0.502 9±0.024 7	0.065 5±0.001 1	437±108		414±17	408.9±6.4	1.2
16	83	443	1 502	0.29	0.053 2±0.001 8	0.358 1±0.012 0	0.048 7±0.000 7	338±75		311±9	306.7±4.1	1.3
17	41	250	474	0.53	0.055 4±0.002 8	0.539 4±0.026 7	0.070 5±0.001 1	429±108		438±18	439.0±6.9	-0.2
18	57	378	571	0.66	0.064 1±0.002 8	0.700 3±0.030 3	0.079 1±0.001 2	745±90		539±18	490.9±7.3	8.9
20	83	334	1 652	0.20	0.054 3±0.0024	0.337 6±0.014 6	0.045 0±0.000 7	383±96		295±11	283.9±4.3	3.9
21	56	361	885	0.41	0.052 4±0.002 2	0.393 1±0.016 0	0.054 3±0.000 8	304±91		337±12	340.7±4.8	-1.2
22	129	161	2 383	0.07	0.052 4±0.001 4	0.365 8±0.009 9	0.050 6±0.000 7	302±60		317±7	318.0±4.0	-0.4
23	61	31	1 153	0.03	0.051 4±0.002 0	0.356 6±0.013 5	0.050 2±0.000 7	258±85		310±10	316.0±4.3	-2.0
24	65	571	790	0.72	0.055 4±0.002 2	0.485 5±0.019 1	0.063 5±0.000 9	428±86		402±13	396.6±5.6	1.3
25	33	81	566	0.14	0.056 6±0.003 1	0.401 2±0.021 8	0.051 4±0.000 9	473±118		343±16	322.9±5.3	5.7
26	63	610	1 024	0.60	0.053 0±0.002 1	0.361 9±0.014 2	0.049 5±0.000 7	327±88		314±11	311.2±4.4	0.8
29	74	412	1 278	0.32	0.059 1±0.002 1	0.402 7±0.013 9	0.049 3±0.000 7	572±74		344±10	310.1±4.2	9.7
30	52	303	964	0.31	0.052 7±0.002 2	0.343 5±0.014 2	0.047 2±0.000 7	315±92		300±11	297.3±4.2	0.9
31	164	1 111	2 211	0.50	0.055 6±0.001 3	0.472 5±0.011 2	0.061 5±0.000 8	435±52		393±8	384.9±4.7	2.0
32	109	301	1 939	0.16	0.051 6±0.001 4	0.369 0±0.010 1	0.051 7±0.000 7	270±62		319±8	325.0±4.1	-1.9
33	62	354	1 086	0.33	0.051 4±0.001 9	0.349 3±0.013 0	0.049 1±0.000 7	261±84		304±10	309.2±4.2	-1.6
35	61	270	1 044	0.26	0.054 6±0.002 0	0.388 6±0.014 2	0.051 5±0.000 7	396±80		333±10	323.7±4.5	2.9

样号	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr±2σ	I_Sr	¹⁴⁷Sm/ ¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd ±2σ	锆石年龄 /Ma	ε_Nd(0)	ε_Nd(t)	f_Sm/Nd	T_DM1 /Ma	T_DMC /Ma
PM4-96-YQ1	2.083 6	0.719 2±17	0.710 018	0.113 0	0.512 3±22	310	-6.67	-3.36	-0.43	1 294	1 345
PM4-96-YQ2	2.871 6	0.722 6±14	0.709 966	0.127 3	0.512 4±12	310	-5.62	-2.87	-0.35	1 413	1 306
PM4-96-YQ3	2.644 9	0.721 6±13	0.709 944	0.125 0	0.512 4±1	310	-5.17	-2.33	-0.36	1 337	1 262
PM4-98-YQ1	1.863 1	0.717 5±14	0.709 328	0.127 0	0.512 3±11	310	-6.67	-3.92	-0.35	1 502	1 390

样号	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr±2σ	I_Sr	¹⁴⁷Sm/ ¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd ±2σ	锆石年龄 /Ma	ε_Nd(0)	ε_Nd(t)	f_Sm/Nd	T_DM1 /Ma	T_DMC /Ma
PM4-96-YQ1	2.083 6	0.719 2±17	0.710 018	0.113 0	0.512 3±22	310	-6.67	-3.36	-0.43	1 294	1 345
PM4-96-YQ2	2.871 6	0.722 6±14	0.709 966	0.127 3	0.512 4±12	310	-5.62	-2.87	-0.35	1 413	1 306
PM4-96-YQ3	2.644 9	0.721 6±13	0.709 944	0.125 0	0.512 4±1	310	-5.17	-2.33	-0.36	1 337	1 262
PM4-98-YQ1	1.863 1	0.717 5±14	0.709 328	0.127 0	0.512 3±11	310	-6.67	-3.92	-0.35	1 502	1 390