Discovery of Late Ordovician sanukitoid-like diorite in southern Altyn orogeny and its geological significance

doi:10.13745/j.esf.sf.2021.10.29

Abstract

Abstract:

In this study, we report the occurrence of Late Ordovician sanukitoid-like diorites of the southern Altyn orogeny, and discuss, on the basis of detailed field work, their petrography, geochronology, whole-rock geochemistry, petrogenesis, mantle source as well as constraint on the tectonic evolution framework of the orogeny. LA-ICP-MS zircon U-Pb dating yielded weighted ²⁰⁶Pb/²³⁷U age of 445±3 Ma, which is interpreted as the formation age of diorite. Geochemically, the diorites had low Al₂O₃ (15.11%-16.19%) and high MgO (3.93%-5.29%) and K₂O (1.68%-2.67%) contents belonging to high Mg, calc-alkaline and metaluminous series. In addition, the diorites possess high Cr (29.3×10^-6-140×10^-6), Ni (27.1×10^-6-43.5×10^-6), Ba (606×10^-6-936×10^-6), Sr (513×10^-6-734×10^-6) and Y (26.4×10^-6-31.1×10^-6) contents, consistent with global high-Mg sanukitoid. They were enriched in REE and LILE (Rb, K), but depleted in HFSE (Nb, Ti, Zr), consistent with arc magma of the subduction zone. Moreover, the diorites could be generated from enriched lithospheric mantle metasomatized by subduction components, on account of high Ti/Zr ratio (48-60) and Mg^# value (46.74-53.06), as well as high Cr (29.3×10^-6-140×10^-6) and Ni (7.1×10^-6-43.5×10^-6) contents. Thus we propose that the Late Ordovician high-Mg sanukitoid-like diorites are the product of decompression melting of mantle wedge during the slab break-off process in a post-collision tectonic setting, and represent the most intensive Paleozoic mantle-derived mafic intrusion in the southern Altyn orogeny.

Key words: southern Altyn orogeny, Late Ordovician, high-Mg sanukitoid-like diorite, post-collisional tectonic setting, mantle-derived mafic magma

CLC Number:

ZENG Zhongcheng, HONG Zenglin, BIAN Xiaowei, CHEN Ning, ZHANG Ruoyu, LI Qi. Discovery of Late Ordovician sanukitoid-like diorite in southern Altyn orogeny and its geological significance[J]. Earth Science Frontiers, 2022, 29(4): 345-357.

Figures/Tables 11

References 55

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样品点号	w_B/10^-6			Th/U	²⁰⁷Pb/²⁰⁶Pb	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ	t_207/206/ Ma	±1σ	t_207/235/ Ma	±1σ	t_206/238/ Ma	±1σ
样品点号	Th	U		Th/U	²⁰⁷Pb/²⁰⁶Pb	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ	t_207/206/ Ma	±1σ	t_207/235/ Ma	±1σ	t_206/238/ Ma	±1σ
1	299		779	0.38	0.055 67	0.001 74	0.551 58	0.010 21	0.071 85	0.001 18	439	68	446	7	447	7
2	81		144	0.56	0.058 09	0.002 28	0.576 09	0.017 18	0.071 91	0.001 25	533	84	462	11	448	8
3	5 455		3 736	1.46	0.058 00	0.001 77	0.576 00	0.010 03	0.072 01	0.001 18	529	66	462	6	448	7
4	680		910	0.75	0.057 94	0.002 33	0.570 47	0.017 65	0.071 39	0.001 27	527	86	458	11	445	8
5	243		557	0.44	0.057 31	0.001 88	0.566 08	0.011 91	0.071 62	0.001 19	503	71	456	8	446	7
6	908		1 577	0.58	0.055 70	0.001 75	0.553 66	0.010 46	0.072 07	0.001 19	440	68	447	7	449	7
7	494		768	0.64	0.056 24	0.001 78	0.555 85	0.010 74	0.071 66	0.001 19	461	69	449	7	446	7
8	220		565	0.39	0.057 63	0.001 84	0.569 50	0.011 18	0.071 66	0.001 19	515	69	458	7	446	7
9	235		581	0.4	0.056 82	0.002 35	0.554 83	0.018 06	0.070 81	0.001 27	484	90	448	12	441	8
10	433		597	0.73	0.056 02	0.001 79	0.551 28	0.010 83	0.071 35	0.001 18	453	69	446	7	444	7
11	3 943		2 839	1.39	0.055 79	0.001 70	0.544 87	0.009 43	0.070 81	0.001 16	444	66	442	6	441	7
12	271		843	0.32	0.056 66	0.001 76	0.559 03	0.010 34	0.071 55	0.001 18	478	68	451	7	446	7
13	346		893	0.39	0.056 28	0.001 75	0.555 35	0.010 18	0.071 56	0.001 18	463	68	449	7	446	7
14	176		577	0.31	0.056 02	0.001 78	0.549 29	0.010 75	0.071 10	0.001 18	453	69	445	7	443	7
15	280		346	0.81	0.058 08	0.002 35	0.568 79	0.017 88	0.071 01	0.001 27	532	87	457	12	442	8
16	446		155	2.88	0.057 91	0.002 18	0.568 42	0.015 78	0.071 18	0.001 24	526	81	457	10	443	7
17	708		670	1.06	0.056 65	0.001 96	0.562 92	0.013 37	0.072 06	0.001 23	477	75	453	9	449	7
18	426		541	0.79	0.056 63	0.001 84	0.557 11	0.011 46	0.071 33	0.001 20	477	71	450	7	444	7
19	387		652	0.59	0.056 41	0.001 77	0.560 47	0.010 71	0.072 05	0.001 20	468	68	452	7	449	7
20	4 223		3 360	1.26	0.056 23	0.001 75	0.560 56	0.010 40	0.072 29	0.001 20	461	68	452	7	450	7
21	459		592	0.78	0.058 09	0.002 21	0.576 42	0.016 30	0.071 96	0.001 27	533	82	462	11	448	8
22	451		657	0.69	0.057 28	0.001 83	0.564 99	0.011 20	0.071 52	0.001 20	502	69	455	7	445	7
23	649		948	0.68	0.057 56	0.001 80	0.565 63	0.010 63	0.071 26	0.001 19	513	68	455	7	444	7
24	2 251		1 300	1.73	0.060 62	0.002 22	0.595 40	0.015 74	0.071 22	0.001 24	626	77	474	10	444	7

样品点号	w_B/10^-6			Th/U	²⁰⁷Pb/²⁰⁶Pb	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ	t_207/206/ Ma	±1σ	t_207/235/ Ma	±1σ	t_206/238/ Ma	±1σ
样品点号	Th	U		Th/U	²⁰⁷Pb/²⁰⁶Pb	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ	t_207/206/ Ma	±1σ	t_207/235/ Ma	±1σ	t_206/238/ Ma	±1σ
1	299		779	0.38	0.055 67	0.001 74	0.551 58	0.010 21	0.071 85	0.001 18	439	68	446	7	447	7
2	81		144	0.56	0.058 09	0.002 28	0.576 09	0.017 18	0.071 91	0.001 25	533	84	462	11	448	8
3	5 455		3 736	1.46	0.058 00	0.001 77	0.576 00	0.010 03	0.072 01	0.001 18	529	66	462	6	448	7
4	680		910	0.75	0.057 94	0.002 33	0.570 47	0.017 65	0.071 39	0.001 27	527	86	458	11	445	8
5	243		557	0.44	0.057 31	0.001 88	0.566 08	0.011 91	0.071 62	0.001 19	503	71	456	8	446	7
6	908		1 577	0.58	0.055 70	0.001 75	0.553 66	0.010 46	0.072 07	0.001 19	440	68	447	7	449	7
7	494		768	0.64	0.056 24	0.001 78	0.555 85	0.010 74	0.071 66	0.001 19	461	69	449	7	446	7
8	220		565	0.39	0.057 63	0.001 84	0.569 50	0.011 18	0.071 66	0.001 19	515	69	458	7	446	7
9	235		581	0.4	0.056 82	0.002 35	0.554 83	0.018 06	0.070 81	0.001 27	484	90	448	12	441	8
10	433		597	0.73	0.056 02	0.001 79	0.551 28	0.010 83	0.071 35	0.001 18	453	69	446	7	444	7
11	3 943		2 839	1.39	0.055 79	0.001 70	0.544 87	0.009 43	0.070 81	0.001 16	444	66	442	6	441	7
12	271		843	0.32	0.056 66	0.001 76	0.559 03	0.010 34	0.071 55	0.001 18	478	68	451	7	446	7
13	346		893	0.39	0.056 28	0.001 75	0.555 35	0.010 18	0.071 56	0.001 18	463	68	449	7	446	7
14	176		577	0.31	0.056 02	0.001 78	0.549 29	0.010 75	0.071 10	0.001 18	453	69	445	7	443	7
15	280		346	0.81	0.058 08	0.002 35	0.568 79	0.017 88	0.071 01	0.001 27	532	87	457	12	442	8
16	446		155	2.88	0.057 91	0.002 18	0.568 42	0.015 78	0.071 18	0.001 24	526	81	457	10	443	7
17	708		670	1.06	0.056 65	0.001 96	0.562 92	0.013 37	0.072 06	0.001 23	477	75	453	9	449	7
18	426		541	0.79	0.056 63	0.001 84	0.557 11	0.011 46	0.071 33	0.001 20	477	71	450	7	444	7
19	387		652	0.59	0.056 41	0.001 77	0.560 47	0.010 71	0.072 05	0.001 20	468	68	452	7	449	7
20	4 223		3 360	1.26	0.056 23	0.001 75	0.560 56	0.010 40	0.072 29	0.001 20	461	68	452	7	450	7
21	459		592	0.78	0.058 09	0.002 21	0.576 42	0.016 30	0.071 96	0.001 27	533	82	462	11	448	8
22	451		657	0.69	0.057 28	0.001 83	0.564 99	0.011 20	0.071 52	0.001 20	502	69	455	7	445	7
23	649		948	0.68	0.057 56	0.001 80	0.565 63	0.010 63	0.071 26	0.001 19	513	68	455	7	444	7
24	2 251		1 300	1.73	0.060 62	0.002 22	0.595 40	0.015 74	0.071 22	0.001 24	626	77	474	10	444	7

样品号	w_B/10^-2													Mg^#	A/NK	A/CNK
样品号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总和	Mg^#	A/NK	A/CNK
PM022/19-1	54.97	1.17	15.23	3.93	4.72	0.14	5.11	6.69	2.29	2.67	0.36	1.72	99.00	52.44	2.29	0.81
PM022/19-2	54.90	1.19	15.30	4.00	4.74	0.14	5.29	6.72	2.24	2.36	0.38	1.81	99.07	53.06	2.45	0.83
PM022/19-3	54.95	1.17	15.32	3.05	5.54	0.14	5.06	6.46	2.38	2.50	0.38	2.01	98.96	52.12	2.31	0.83
PM022/19-4	54.83	1.17	15.34	2.52	5.90	0.14	5.17	6.72	2.26	2.45	0.38	2.02	98.90	53.01	2.41	0.83
PM022/19-5	54.52	1.17	15.11	2.80	5.82	0.14	5.14	6.74	2.40	2.55	0.37	2.11	98.87	52.34	2.25	0.80
D8834/2	55.20	1.30	16.19	2.97	5.31	0.15	3.93	6.59	3.34	1.68	0.45	2.07	99.18	46.74	2.21	0.84
样品号	w_B/10^-6
样品号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	∑REE
PM022/19-1	32.0	63.9	8.05	30.90	7.03	2.06	6.06	0.90	4.70	1.02	2.65	0.44	2.36	0.42	26.4	188.89
PM022/19-2	36.0	71.7	8.92	36.00	7.80	2.12	7.28	0.94	5.15	1.15	3.08	0.57	2.77	0.45	30.1	214.03
PM022/19-3	40.4	70.2	10.10	39.40	8.77	2.31	7.56	1.07	5.89	1.22	3.14	0.56	2.67	0.54	31.3	225.13
PM022/19-4	34.8	69.4	8.82	36.00	7.94	2.22	7.36	1.01	5.41	1.17	3.20	0.54	2.85	0.54	29.5	210.76
PM022/19-5	31.8	65.6	8.43	34.40	7.44	2.14	6.65	0.98	5.20	1.03	2.88	0.49	2.44	0.44	27.7	197.62
D8834/2	62.7	123.0	148.00	55.65	9.75	2.71	8.38	1.14	5.28	1.15	3.05	0.55	2.65	0.47	29.9	454.38
样品号	w_B/10^-6														Ti/Zr	Nb/Ta
样品号	Ti	Pb	Ni	Cr	Ga	Sr	Ba	Rb	Nb	Ta	Zr	Hf	U	Th	Ti/Zr	Nb/Ta
PM022/19-1	7 560	37.3	41.1	135.9	19.7	547.1	901.2	85.7	15.8	1.85	140.4	1.94	2.73	13.8	54	8.54
PM022/19-2	8 014	34.3	44.8	139.2	18.7	537.6	910.0	84.0	20.5	2.09	134.5	2.08	3.30	12.9	60	9.81
PM022/19-3	8 043	35.3	42.0	138.6	19.3	513.3	866.6	86.7	20.7	2.28	135.1	2.27	2.90	13.0	60	9.08
PM022/19-4	8 163	38.4	43.5	140.1	18.9	526.1	935.7	84.0	19.7	2.79	136.6	2.84	3.36	12.2	60	7.06
PM022/19-5	7 644	32.2	40.4	137.0	18.0	529.9	899.2	81.3	12.4	2.50	131.3	2.64	2.97	10.9	58	4.96
D8834/2	8 713	25.5	27.1	29.3	21.9	734.0	606.0	64.7	23.9	2.31	180.0	2.37	3.17	12.5	48	10.35

样品号	w_B/10^-2													Mg^#	A/NK	A/CNK
样品号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总和	Mg^#	A/NK	A/CNK
PM022/19-1	54.97	1.17	15.23	3.93	4.72	0.14	5.11	6.69	2.29	2.67	0.36	1.72	99.00	52.44	2.29	0.81
PM022/19-2	54.90	1.19	15.30	4.00	4.74	0.14	5.29	6.72	2.24	2.36	0.38	1.81	99.07	53.06	2.45	0.83
PM022/19-3	54.95	1.17	15.32	3.05	5.54	0.14	5.06	6.46	2.38	2.50	0.38	2.01	98.96	52.12	2.31	0.83
PM022/19-4	54.83	1.17	15.34	2.52	5.90	0.14	5.17	6.72	2.26	2.45	0.38	2.02	98.90	53.01	2.41	0.83
PM022/19-5	54.52	1.17	15.11	2.80	5.82	0.14	5.14	6.74	2.40	2.55	0.37	2.11	98.87	52.34	2.25	0.80
D8834/2	55.20	1.30	16.19	2.97	5.31	0.15	3.93	6.59	3.34	1.68	0.45	2.07	99.18	46.74	2.21	0.84
样品号	w_B/10^-6
样品号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	∑REE
PM022/19-1	32.0	63.9	8.05	30.90	7.03	2.06	6.06	0.90	4.70	1.02	2.65	0.44	2.36	0.42	26.4	188.89
PM022/19-2	36.0	71.7	8.92	36.00	7.80	2.12	7.28	0.94	5.15	1.15	3.08	0.57	2.77	0.45	30.1	214.03
PM022/19-3	40.4	70.2	10.10	39.40	8.77	2.31	7.56	1.07	5.89	1.22	3.14	0.56	2.67	0.54	31.3	225.13
PM022/19-4	34.8	69.4	8.82	36.00	7.94	2.22	7.36	1.01	5.41	1.17	3.20	0.54	2.85	0.54	29.5	210.76
PM022/19-5	31.8	65.6	8.43	34.40	7.44	2.14	6.65	0.98	5.20	1.03	2.88	0.49	2.44	0.44	27.7	197.62
D8834/2	62.7	123.0	148.00	55.65	9.75	2.71	8.38	1.14	5.28	1.15	3.05	0.55	2.65	0.47	29.9	454.38
样品号	w_B/10^-6														Ti/Zr	Nb/Ta
样品号	Ti	Pb	Ni	Cr	Ga	Sr	Ba	Rb	Nb	Ta	Zr	Hf	U	Th	Ti/Zr	Nb/Ta
PM022/19-1	7 560	37.3	41.1	135.9	19.7	547.1	901.2	85.7	15.8	1.85	140.4	1.94	2.73	13.8	54	8.54
PM022/19-2	8 014	34.3	44.8	139.2	18.7	537.6	910.0	84.0	20.5	2.09	134.5	2.08	3.30	12.9	60	9.81
PM022/19-3	8 043	35.3	42.0	138.6	19.3	513.3	866.6	86.7	20.7	2.28	135.1	2.27	2.90	13.0	60	9.08
PM022/19-4	8 163	38.4	43.5	140.1	18.9	526.1	935.7	84.0	19.7	2.79	136.6	2.84	3.36	12.2	60	7.06
PM022/19-5	7 644	32.2	40.4	137.0	18.0	529.9	899.2	81.3	12.4	2.50	131.3	2.64	2.97	10.9	58	4.96
D8834/2	8 713	25.5	27.1	29.3	21.9	734.0	606.0	64.7	23.9	2.31	180.0	2.37	3.17	12.5	48	10.35