Late Triassic Mg andesite of Juluotage, eastern Tianshan: Identification and tectonic implications

doi:10.13745/j.esf.sf.2021.10.1

Abstract

Abstract:

The petrogenesis and sources of Indosinian magmatic rocks and the associated geodynamic settings in eastern Tianshan, Xinjiang have long been debated. In this study, the Aqishan andesites were investigated through integrated petrographic, geochemical and zircon U-Pb-Hf isotopic analyses. The andesites had a typical porphyritic texture and vesicular structure. The porphyritic texture was made of clinopyroxene and plagioclase phenocrysts in a matrix of acicular plagioclase. Zircon U-Pb dating results showed the Mg andesites erupted in ca. 235 Ma (Late Triassic) and contained Carboniferous inherited zircon grains. In-situ Hf isotopic analysis showed the magmatic zircon grains had negative ε_Hf(t) values (-31.7--7.6) and Hf model ages of 2.2-0.7 Ga. The samples were geochemically marked by high MgO contents (3.7%-4.7%) and K₂O/Na₂O ratios (0.6-1.1) and low TFeO/MgO ratios (1.6-1.8) resembling high-K calc-alkaline Mg andesites. Geochemical characteristics combined with regional tectono-magmatic activities revealed the Aqishan Mg andesites were derived from partial melting of a phlogopite-bearing lithospheric mantle in an intraplate extensional setting. Therefore, during the Late Triassic, the lithosphere in eastern Tianshan was in an extension-thinning stage.

Key words: magnesian andesite, intraplate extension, lithospheric extension and thinning, Late Triassic, eastern Tianshan

CLC Number:

KANG Huan, CHEN Yuelong, LI Dapeng, ZHANG Huiping, YANG Yi, XUE Guoliang, LIU Wei. Late Triassic Mg andesite of Juluotage, eastern Tianshan: Identification and tectonic implications[J]. Earth Science Frontiers, 2022, 29(4): 358-370.

Figures/Tables 12

References 70

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点号	Th/U	同位素比值及误差						同位素年龄及误差/Ma						谐和度
点号	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	谐和度
X13-7-01	0.24	0.057 373	0.002 365	0.417 526	0.023 298	0.053 330	0.002 433	506	44	354	8	335	7	94%
X13-7-02	0.71	0.052 147	0.017 437	0.253 333	0.086 994	0.036 135	0.002 756	300	335	229	35	229	9	99%
X13-7-04	0.55	0.052 103	0.003 396	0.269 417	0.017 671	0.037 713	0.000 801	300	74	242	7	239	2	98%
X13-7-05	0.55	0.052 657	0.003 618	0.270 367	0.018 879	0.037 384	0.000 811	322	78	243	8	237	3	97%
X13-7-06	1.29	0.051 660	0.008 490	0.253 090	0.038 878	0.036 029	0.001 235	333	186	229	16	228	4	99%
X13-7-07	1.35	0.053 506	0.006 003	0.262 879	0.028 213	0.036 196	0.001 036	350	128	237	11	229	3	96%
X13-7-08	0.59	0.051 497	0.001 973	0.265 711	0.010 643	0.037 447	0.000 647	265	44	239	4	237	2	99%
X13-7-09	0.60	0.051 602	0.002 043	0.264 393	0.010 610	0.037 222	0.000 625	333	51	238	4	236	2	98%
X13-7-11	0.81	0.053 987	0.006 006	0.278 562	0.030 109	0.038 064	0.001 090	372	131	250	12	241	3	96%
X13-7-12	0.82	0.050 914	0.011 049	0.259 358	0.059 099	0.036 898	0.001 652	235	243	234	24	234	5	99%
X13-7-13	0.53	0.056 223	0.010 844	0.278 892	0.049 480	0.036 182	0.001 579	461	215	250	20	229	5	91%
X13-7-14	1.03	0.053 052	0.006 962	0.273 297	0.037 821	0.037 287	0.001 328	332	148	245	15	236	4	96%
X13-7-15	1.05	0.051 304	0.004 904	0.260 538	0.022 196	0.036 873	0.001 301	254	111	235	9	233	4	99%
X13-7-20	1.32	0.057 785	0.006 162	0.407 489	0.042 453	0.051 907	0.001 755	520	84	347	15	326	5	93%
X13-7-21	0.58	0.053 930	0.005 637	0.391 467	0.039 063	0.052 954	0.002 376	369	114	335	14	333	7	99%
X13-7-22	0.42	0.051 796	0.004 066	0.271 037	0.021 403	0.038 010	0.000 783	276	91	244	9	240	2	98%
X13-7-23	0.47	0.051 106	0.003 960	0.259 571	0.020 961	0.036 872	0.000 906	256	89	234	8	233	3	99%

点号	Th/U	同位素比值及误差						同位素年龄及误差/Ma						谐和度
点号	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	谐和度
X13-7-01	0.24	0.057 373	0.002 365	0.417 526	0.023 298	0.053 330	0.002 433	506	44	354	8	335	7	94%
X13-7-02	0.71	0.052 147	0.017 437	0.253 333	0.086 994	0.036 135	0.002 756	300	335	229	35	229	9	99%
X13-7-04	0.55	0.052 103	0.003 396	0.269 417	0.017 671	0.037 713	0.000 801	300	74	242	7	239	2	98%
X13-7-05	0.55	0.052 657	0.003 618	0.270 367	0.018 879	0.037 384	0.000 811	322	78	243	8	237	3	97%
X13-7-06	1.29	0.051 660	0.008 490	0.253 090	0.038 878	0.036 029	0.001 235	333	186	229	16	228	4	99%
X13-7-07	1.35	0.053 506	0.006 003	0.262 879	0.028 213	0.036 196	0.001 036	350	128	237	11	229	3	96%
X13-7-08	0.59	0.051 497	0.001 973	0.265 711	0.010 643	0.037 447	0.000 647	265	44	239	4	237	2	99%
X13-7-09	0.60	0.051 602	0.002 043	0.264 393	0.010 610	0.037 222	0.000 625	333	51	238	4	236	2	98%
X13-7-11	0.81	0.053 987	0.006 006	0.278 562	0.030 109	0.038 064	0.001 090	372	131	250	12	241	3	96%
X13-7-12	0.82	0.050 914	0.011 049	0.259 358	0.059 099	0.036 898	0.001 652	235	243	234	24	234	5	99%
X13-7-13	0.53	0.056 223	0.010 844	0.278 892	0.049 480	0.036 182	0.001 579	461	215	250	20	229	5	91%
X13-7-14	1.03	0.053 052	0.006 962	0.273 297	0.037 821	0.037 287	0.001 328	332	148	245	15	236	4	96%
X13-7-15	1.05	0.051 304	0.004 904	0.260 538	0.022 196	0.036 873	0.001 301	254	111	235	9	233	4	99%
X13-7-20	1.32	0.057 785	0.006 162	0.407 489	0.042 453	0.051 907	0.001 755	520	84	347	15	326	5	93%
X13-7-21	0.58	0.053 930	0.005 637	0.391 467	0.039 063	0.052 954	0.002 376	369	114	335	14	333	7	99%
X13-7-22	0.42	0.051 796	0.004 066	0.271 037	0.021 403	0.038 010	0.000 783	276	91	244	9	240	2	98%
X13-7-23	0.47	0.051 106	0.003 960	0.259 571	0.020 961	0.036 872	0.000 906	256	89	234	8	233	3	99%

点号	w_B/(μg·g^-1)
点号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
X13-7-01	18.22	130.83	24.13	149.75	98.56	35.29	153.24	38.39	301.19	80.45	303.53	59.95	545.15	88.82
X13-7-02	97.46	192.27	19.28	75.84	17.31	1.54	29.90	7.64	78.37	30.27	137.27	31.76	325.61	63.13
X13-7-04	0.24	24.86	0.18	2.27	4.52	1.27	26.49	9.30	117.75	46.58	212.97	51.24	512.89	87.81
X13-7-05	0.03	24.48	0.13	1.98	4.67	1.21	27.23	9.51	119.18	47.23	215.24	51.80	519.80	88.99
X13-7-06	0.15	49.77	0.39	6.75	11.22	4.64	50.73	14.18	150.77	50.18	204.66	42.77	386.32	65.77
X13-7-07	0.16	50.02	0.44	7.00	11.66	4.97	51.10	14.30	153.54	50.86	204.62	42.85	382.61	66.16
X13-7-08	0.06	21.86	0.10	2.13	5.27	0.71	38.13	13.70	171.14	67.12	298.42	67.53	661.17	111.62
X13-7-09	0.05	21.77	0.10	2.20	5.17	0.71	38.13	13.63	169.96	66.39	294.41	66.72	653.99	109.95
X13-7-11	0.01	14.70	0.18	3.11	4.89	1.82	24.14	7.50	83.41	30.23	130.08	29.68	292.11	50.31
X13-7-12	0.01	15.15	0.23	3.56	4.83	1.77	23.54	8.47	87.46	32.69	141.49	31.86	314.79	55.11
X13-7-13	0.55	12.18	0.78	5.50	4.16	1.06	26.61	9.12	112.99	47.22	220.98	47.97	456.08	80.78
X13-7-14	2.12	91.98	0.57	4.31	6.42	1.99	32.97	10.22	118.75	42.42	183.30	42.39	406.49	71.33
X13-7-15	2.83	103.42	0.77	4.91	5.45	2.07	35.31	11.61	124.09	45.35	193.52	44.58	431.26	74.75
X13-7-20	4.19	36.61	1.91	12.76	10.21	3.48	58.38	20.26	260.53	100.84	444.84	96.06	892.23	147.59
X13-7-21	0.01	13.50	0.08	0.76	1.75	0.52	15.14	6.48	86.72	38.95	196.53	51.47	576.62	100.48
X13-7-22	1.78	17.54	0.83	5.71	7.00	1.34	28.25	9.27	101.64	35.31	153.45	33.32	309.06	53.77
X13-7-23	1.32	18.49	0.75	5.55	7.49	1.62	31.42	10.15	113.27	38.81	160.78	35.82	331.86	54.58

点号	w_B/(μg·g^-1)
点号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
X13-7-01	18.22	130.83	24.13	149.75	98.56	35.29	153.24	38.39	301.19	80.45	303.53	59.95	545.15	88.82
X13-7-02	97.46	192.27	19.28	75.84	17.31	1.54	29.90	7.64	78.37	30.27	137.27	31.76	325.61	63.13
X13-7-04	0.24	24.86	0.18	2.27	4.52	1.27	26.49	9.30	117.75	46.58	212.97	51.24	512.89	87.81
X13-7-05	0.03	24.48	0.13	1.98	4.67	1.21	27.23	9.51	119.18	47.23	215.24	51.80	519.80	88.99
X13-7-06	0.15	49.77	0.39	6.75	11.22	4.64	50.73	14.18	150.77	50.18	204.66	42.77	386.32	65.77
X13-7-07	0.16	50.02	0.44	7.00	11.66	4.97	51.10	14.30	153.54	50.86	204.62	42.85	382.61	66.16
X13-7-08	0.06	21.86	0.10	2.13	5.27	0.71	38.13	13.70	171.14	67.12	298.42	67.53	661.17	111.62
X13-7-09	0.05	21.77	0.10	2.20	5.17	0.71	38.13	13.63	169.96	66.39	294.41	66.72	653.99	109.95
X13-7-11	0.01	14.70	0.18	3.11	4.89	1.82	24.14	7.50	83.41	30.23	130.08	29.68	292.11	50.31
X13-7-12	0.01	15.15	0.23	3.56	4.83	1.77	23.54	8.47	87.46	32.69	141.49	31.86	314.79	55.11
X13-7-13	0.55	12.18	0.78	5.50	4.16	1.06	26.61	9.12	112.99	47.22	220.98	47.97	456.08	80.78
X13-7-14	2.12	91.98	0.57	4.31	6.42	1.99	32.97	10.22	118.75	42.42	183.30	42.39	406.49	71.33
X13-7-15	2.83	103.42	0.77	4.91	5.45	2.07	35.31	11.61	124.09	45.35	193.52	44.58	431.26	74.75
X13-7-20	4.19	36.61	1.91	12.76	10.21	3.48	58.38	20.26	260.53	100.84	444.84	96.06	892.23	147.59
X13-7-21	0.01	13.50	0.08	0.76	1.75	0.52	15.14	6.48	86.72	38.95	196.53	51.47	576.62	100.48
X13-7-22	1.78	17.54	0.83	5.71	7.00	1.34	28.25	9.27	101.64	35.31	153.45	33.32	309.06	53.77
X13-7-23	1.32	18.49	0.75	5.55	7.49	1.62	31.42	10.15	113.27	38.81	160.78	35.82	331.86	54.58

点号	Age/Ma	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	2σ	(¹⁷⁶Hf/¹⁷⁷Hf)_i	ε_Hf(0)	ε_Hf(t)	T_DM/Ga	f_Lu/Hf
X13-7-01	335	0.047 718	0.000 813	0.282 307	0.000 039	0.282 302	-16.4	-9.3	1.3	-0.95
X13-7-08	237	0.116 360	0.002 023	0.282 267	0.000 044	0.282 258	-17.9	-13.0	1.4	-0.87
X13-7-13	229	0.079 906	0.001 279	0.282 525	0.000 038	0.282 520	-8.7	-8.1	1.0	-0.91
X13-7-14	236	0.132 003	0.002 149	0.282 421	0.000 039	0.282 412	-12.4	-7.6	1.2	-0.86
X13-7-15	233	0.109 646	0.001 994	0.281 740	0.000 079	0.281 731	-36.5	-31.7	2.2	-0.87
X13-7-20	326	0.288 233	0.004 642	0.282 796	0.000 060	0.282 768	0.8	7.0	0.7	-0.69
X13-7-24	233	0.072 625	0.001 241	0.282 075	0.000 053	0.282 070	-24.6	-19.7	1.7	-0.92