Late Cretaceous Evolution of the Neo-Tethys:Evidence from Geochronology, Geochemistry, and Sr-Nd Isotopes of Gongguori Monzogranite in Zedang

doi:10.19657/j.geoscience.1000-8527.2021.065

Abstract

Abstract:

To deepen our understanding on the evolution of the Neo-Tethys ocean in Zedang area, Tibet, a study of the petrology, petrochemistry, isotope and geochronology of the Gongguori monzogranite in the Zedang ophiolitic mélange belt is carried out. The result shows that it is small and has similar lithology. LA-ICP-MS zircon U-Pb dating on the pluton yielded Late Cretaceous crystallization age of (90.40±0.68) Ma. The Gongguori monzogranite is rich in Si, Al, and K and Ti-poor, and is metaluminous, calc-alkaline to alkaline. The rocks show LREE enrichments, HREE depletions, and negative Eu anomaly. The monzogranite is also enriched in LILEs (e.g.,Rb, K, Ba, Th, U) and depleted in HSFEs (e.g., Nb, P, Ti). The rocks have (⁸⁷Sr/⁸⁶Sr)_i=0.705,708 to 0.706,284, (¹⁴³Nd/¹⁴⁴Nd)_i=0.512,689 to 0.512,716, and positive ε_Nd(t)=2.00 to 2.51. Based on the geochronological and geochemical characteristics of the Gongguori pluton, this study demonstrates that the Gongguori monzogranite was formed by normal island arc I-type granitic magmatism. The Gongguori monzogranite may have been a partial melting product of the upper crust, which was formed by the Late Cretaceous north-dipping subduction of the Neo-Tethys. The Gongguori monzogranite is unlikely part of the Zedang ophiolite, and the Zedang intra-oceanic arc may have disappeared before 90 Ma.

Key words: Zedang, Tibet, ophiolite, monzogranite, geochemistry, zircon U-Pb dating, petrogenesis

CLC Number:

P588.12
P597

ZHANG Zhiping, ZHONG Kanghui, SHAN Shucheng, ZHENG Xin, HUANG Haozhen, YAN Zhao. Late Cretaceous Evolution of the Neo-Tethys:Evidence from Geochronology, Geochemistry, and Sr-Nd Isotopes of Gongguori Monzogranite in Zedang[J]. Geoscience, 2021, 35(05): 1194-1205.

Figures/Tables 19

References 49

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分析点号	含量/10^-6		Th/U	同位素比值			年龄/Ma
分析点号	Th²³²	U²³⁸	Th/U	²⁰⁷Pb/ ²⁰⁶Pb(1σ)	²⁰⁷Pb/ ²³⁵U(1σ)	²⁰⁶Pb/ ²³⁸U(1σ)	²⁰⁷Pb/ ²⁰⁶Pb(1σ)	²⁰⁷Pb/ ²³⁵U(1σ)	²⁰⁶Pb/ ²³⁸U(1σ)
01	892	580	1.54	0.047 9(0.001 3)	0.095 3(0.002 6)	0.014 4(0.000 2)	96(37)	92(2)	92(1)
02	469	231	2.03	0.047 9(0.001 9)	0.094 7(0.003 8)	0.014 4(0.000 2)	92(61)	92(4)	92(2)
04	291	169	1.72	0.048 0(0.002 6)	0.096 2(0.005 1)	0.014 5(0.000 3)	98(85)	93(5)	93(2)
05	1 427	1 036	1.38	0.047 9(0.001 1)	0.093 8(0.002 4)	0.014 2(0.000 2)	93(32)	91(2)	91(1)
07	2 140	1 240	1.73	0.047 9(0.001 5)	0.090 2(0.002 8)	0.013 7(0.000 2)	92(45)	88(3)	88(1)
08	513	425	1.21	0.047 8(0.001 9)	0.092 4(0.003 6)	0.014 0(0.000 2)	91(58)	90(3)	90(2)
09	986	549	1.80	0.046 1(0.006 8)	0.091 4(0.013 5)	0.014 4(0.000 3)	(270)	89(13)	92(2)
10	2 390	1 091	2.19	0.047 9(0.001 0)	0.094 5(0.002 1)	0.014 3(0.000 2)	95(27)	92(2)	92(1)
11	200	174	1.15	0.048 0(0.003 0)	0.094 7(0.005 9)	0.014 3(0.000 3)	97(101)	92(5)	92(2)
12	809	499	1.62	0.061 9(0.002 8)	0.121 5(0.005 4)	0.014 2(0.000 3)	671(61)	116(5)	91(2)
13	187	159	1.18	0.047 8(0.002 9)	0.091 5(0.005 4)	0.013 9(0.000 3)	89(97)	89(5)	89(2)
14	369	306	1.20	0.046 1(0.004 8)	0.089 6(0.009 3)	0.014 1(0.000 2)	(213)	87(9)	90(1)
15	444	393	1.13	0.054 1(0.003 3)	0.104 3(0.006 2)	0.014 0(0.000 3)	376(91)	101(6)	89(2)
16	883	409	2.16	0.047 8(0.001 4)	0.092 5(0.002 8)	0.014 0(0.000 2)	90(43)	90(3)	90(1)
18	904	604	1.50	0.047 8(0.001 4)	0.092 6(0.002 7)	0.014 1(0.000 2)	90(40)	90(2)	90(1)
19	575	431	1.34	0.047 8(0.001 5)	0.091 2(0.003 0)	0.013 8(0.000 2)	91(48)	89(3)	88(1)
20	1 575	733	2.15	0.047 8(0.001 3)	0.092 6(0.002 6)	0.014 0(0.000 2)	91(38)	90(2)	90(1)
21	447	286	1.56	0.048 3(0.002 8)	0.097 2(0.005 5)	0.014 6(0.000 3)	115(90)	94(5)	93(2)
23	1 025	756	1.36	0.047 7(0.001 9)	0.095 3(0.003 9)	0.014 5(0.000 3)	85(58)	92(4)	93(2)
24	1 977	1 220	1.62	0.060 0(0.001 8)	0.117 7(0.003 6)	0.014 2(0.000 2)	604(37)	113(3)	91(2)
25	594	474	1.25	0.046 1(0.008 5)	0.089 2(0.016 4)	0.014 1(0.000 3)	(317)	87(15)	90(2)

分析点号	含量/10^-6		Th/U	同位素比值			年龄/Ma
分析点号	Th²³²	U²³⁸	Th/U	²⁰⁷Pb/ ²⁰⁶Pb(1σ)	²⁰⁷Pb/ ²³⁵U(1σ)	²⁰⁶Pb/ ²³⁸U(1σ)	²⁰⁷Pb/ ²⁰⁶Pb(1σ)	²⁰⁷Pb/ ²³⁵U(1σ)	²⁰⁶Pb/ ²³⁸U(1σ)
01	892	580	1.54	0.047 9(0.001 3)	0.095 3(0.002 6)	0.014 4(0.000 2)	96(37)	92(2)	92(1)
02	469	231	2.03	0.047 9(0.001 9)	0.094 7(0.003 8)	0.014 4(0.000 2)	92(61)	92(4)	92(2)
04	291	169	1.72	0.048 0(0.002 6)	0.096 2(0.005 1)	0.014 5(0.000 3)	98(85)	93(5)	93(2)
05	1 427	1 036	1.38	0.047 9(0.001 1)	0.093 8(0.002 4)	0.014 2(0.000 2)	93(32)	91(2)	91(1)
07	2 140	1 240	1.73	0.047 9(0.001 5)	0.090 2(0.002 8)	0.013 7(0.000 2)	92(45)	88(3)	88(1)
08	513	425	1.21	0.047 8(0.001 9)	0.092 4(0.003 6)	0.014 0(0.000 2)	91(58)	90(3)	90(2)
09	986	549	1.80	0.046 1(0.006 8)	0.091 4(0.013 5)	0.014 4(0.000 3)	(270)	89(13)	92(2)
10	2 390	1 091	2.19	0.047 9(0.001 0)	0.094 5(0.002 1)	0.014 3(0.000 2)	95(27)	92(2)	92(1)
11	200	174	1.15	0.048 0(0.003 0)	0.094 7(0.005 9)	0.014 3(0.000 3)	97(101)	92(5)	92(2)
12	809	499	1.62	0.061 9(0.002 8)	0.121 5(0.005 4)	0.014 2(0.000 3)	671(61)	116(5)	91(2)
13	187	159	1.18	0.047 8(0.002 9)	0.091 5(0.005 4)	0.013 9(0.000 3)	89(97)	89(5)	89(2)
14	369	306	1.20	0.046 1(0.004 8)	0.089 6(0.009 3)	0.014 1(0.000 2)	(213)	87(9)	90(1)
15	444	393	1.13	0.054 1(0.003 3)	0.104 3(0.006 2)	0.014 0(0.000 3)	376(91)	101(6)	89(2)
16	883	409	2.16	0.047 8(0.001 4)	0.092 5(0.002 8)	0.014 0(0.000 2)	90(43)	90(3)	90(1)
18	904	604	1.50	0.047 8(0.001 4)	0.092 6(0.002 7)	0.014 1(0.000 2)	90(40)	90(2)	90(1)
19	575	431	1.34	0.047 8(0.001 5)	0.091 2(0.003 0)	0.013 8(0.000 2)	91(48)	89(3)	88(1)
20	1 575	733	2.15	0.047 8(0.001 3)	0.092 6(0.002 6)	0.014 0(0.000 2)	91(38)	90(2)	90(1)
21	447	286	1.56	0.048 3(0.002 8)	0.097 2(0.005 5)	0.014 6(0.000 3)	115(90)	94(5)	93(2)
23	1 025	756	1.36	0.047 7(0.001 9)	0.095 3(0.003 9)	0.014 5(0.000 3)	85(58)	92(4)	93(2)
24	1 977	1 220	1.62	0.060 0(0.001 8)	0.117 7(0.003 6)	0.014 2(0.000 2)	604(37)	113(3)	91(2)
25	594	474	1.25	0.046 1(0.008 5)	0.089 2(0.016 4)	0.014 1(0.000 3)	(317)	87(15)	90(2)

样品编号	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量	A/NK
17-36	73.12	0.18	13.45	6.67	0.06	0.38	1.79	4.45	3.87	0.05	1.04	100.31	1.17
17-40	68.43	0.21	14.65	2.03	0.07	0.49	1.73	4.78	3.76	0.06	1.00	99.68	1.23
17-42	73.37	0.19	13.83	6.14	0.05	0.34	2.26	5.00	2.50	0.06	0.90	99.71	1.27
7885-1	73.21	0.14	14.23	0.54	0.05	0.17	1.05	5.42	3.98	0.03	0.69	100.15	1.08
7890-1	71.74	0.21	14.60	0.61	0.05	0.46	1.23	5.71	3.13	0.06	0.87	99.95	1.14
7891-2	71.46	0.23	14.77	0.56	0.04	0.42	1.24	6.21	2.84	0.06	0.84	100.15	1.11
7892-2	69.66	0.23	15.76	0.64	0.04	0.48	1.41	4.65	5.12	0.07	0.91	99.88	1.20
样品编号	A/CNK	DI	AR	Mg^#	K₂O/Na₂O	Rb	Sr	Ba	Th	U	Nb	Ta	Zr
17-36	0.91	89.66	3.40	37.21	0.87	89.29	196.59	558.20	9.48	1.96	5.65	0.46	71.72
17-40	0.97	87.48	3.18	39.06	0.79	90.90	242.56	528.52	11.97	1.57	6.52	0.61	102.21
17-42	0.92	87.50	2.75	36.70	0.50	53.68	187.21	385.91	8.44	1.64	4.78	0.45	83.58
7885-1	0.94	94.23	4.19	30.11	0.73	86.45	113.25	481.03	8.21	1.55	6.09	0.48	70.09
7890-1	0.97	90.32	3.53	35.64	0.55	68.68	237.23	402.11	8.43	1.84	5.49	0.49	77.57
7891-2	0.95	91.08	3.60	34.77	0.46	58.79	257.73	347.18	9.06	1.36	5.55	0.46	71.28
7892-2	1.00	88.95	3.36	39.20	1.10	101.48	176.18	555.27	9.09	1.60	5.51	0.50	82.61
样品编号	Hf	Co	Ni	Cr	V	Sc	Li	Cs	Be	Ga	Tl	Pb	As
17-36	2.01	1.82	0.29	4.59	16.45	4.11	6.68	3.79	1.71	13.67	0.49	14.93	1.32
17-40	2.99	2.31	3.01	8.17	19.54	4.42	13.81	2.11	1.76	15.50	0.49	17.52	1.92
17-42	2.33	2.31	2.66	8.17	17.10	3.61	12.19	1.46	1.70	12.65	0.33	12.79	2.65
7885-1	2.26	0.27	0.77	2.78	7.85	6.35	3.95	1.86	1.73	12.86	0.46	19.44	3.69
7890-1	2.62	1.79	0.95	3.11	18.16	6.02	7.11	2.37	2.50	13.48	0.37	12.56	7.72
7891-2	2.23	1.78	1.18	2.19	23.55	5.38	3.61	1.58	0.93	12.99	0.29	16.98	6.65
7892-2	2.35	1.90	1.43	3.53	18.42	5.99	6.86	3.49	2.29	14.04	0.56	15.53	2.04
样品编号	Bi	Ge	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er
17-36	0.10	1.04	18.99	35.58	3.48	11.68	2.15	0.44	1.77	0.25	1.40	0.29	0.87
17-40	0.04	1.17	23.11	44.67	4.26	15.22	2.64	0.54	2.04	0.32	1.77	0.41	1.10
17-42	0.04	1.09	18.02	34.24	3.49	11.95	2.18	0.43	1.62	0.25	1.40	0.30	0.97
7885-1	0.02	1.20	17.01	35.46	3.16	11.13	2.15	0.40	1.61	0.26	1.51	0.35	0.94
7890-1	0.02	1.27	18.36	36.22	3.25	9.76	1.97	0.40	1.56	0.25	1.36	0.31	0.82
7891-2	0.05	1.02	20.48	40.00	3.69	11.86	2.17	0.42	1.60	0.26	1.46	0.32	0.88
7892-2	0.07	0.90	21.02	37.74	3.68	10.72	2.13	0.49	1.65	0.27	1.44	0.32	0.95
样品编号	Tm	Yb	Lu	Y	La/Nb	Nb/Ta	Sm/Nd	REE	LREE/ HREE	(La/ Yb)_N	(La/ Sm)_N	δEu	δCe
17-36	0.14	0.93	0.16	9.39	3.36	12.16	0.18	78.11	12.48	13.44	5.37	0.69	1.02
17-40	0.18	1.29	0.22	12.21	3.55	10.67	0.17	97.76	12.34	11.80	5.34	0.71	1.05
17-42	0.14	1.02	0.18	9.97	3.77	10.65	0.18	76.17	11.99	11.71	5.03	0.70	1.01
7885-1	0.14	1.16	0.18	11.66	2.79	12.76	0.19	75.47	11.28	9.71	4.82	0.67	1.13
7890-1	0.13	0.94	0.16	10.86	3.34	11.31	0.20	75.48	12.67	12.91	5.69	0.70	1.10
7891-2	0.14	1.02	0.14	11.28	3.69	12.03	0.18	84.43	13.53	13.24	5.76	0.70	1.08
7892-2	0.14	1.05	0.16	10.77	3.81	10.94	0.20	81.76	12.67	13.23	6.03	0.80	1.00

样品编号	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量	A/NK
17-36	73.12	0.18	13.45	6.67	0.06	0.38	1.79	4.45	3.87	0.05	1.04	100.31	1.17
17-40	68.43	0.21	14.65	2.03	0.07	0.49	1.73	4.78	3.76	0.06	1.00	99.68	1.23
17-42	73.37	0.19	13.83	6.14	0.05	0.34	2.26	5.00	2.50	0.06	0.90	99.71	1.27
7885-1	73.21	0.14	14.23	0.54	0.05	0.17	1.05	5.42	3.98	0.03	0.69	100.15	1.08
7890-1	71.74	0.21	14.60	0.61	0.05	0.46	1.23	5.71	3.13	0.06	0.87	99.95	1.14
7891-2	71.46	0.23	14.77	0.56	0.04	0.42	1.24	6.21	2.84	0.06	0.84	100.15	1.11
7892-2	69.66	0.23	15.76	0.64	0.04	0.48	1.41	4.65	5.12	0.07	0.91	99.88	1.20
样品编号	A/CNK	DI	AR	Mg^#	K₂O/Na₂O	Rb	Sr	Ba	Th	U	Nb	Ta	Zr
17-36	0.91	89.66	3.40	37.21	0.87	89.29	196.59	558.20	9.48	1.96	5.65	0.46	71.72
17-40	0.97	87.48	3.18	39.06	0.79	90.90	242.56	528.52	11.97	1.57	6.52	0.61	102.21
17-42	0.92	87.50	2.75	36.70	0.50	53.68	187.21	385.91	8.44	1.64	4.78	0.45	83.58
7885-1	0.94	94.23	4.19	30.11	0.73	86.45	113.25	481.03	8.21	1.55	6.09	0.48	70.09
7890-1	0.97	90.32	3.53	35.64	0.55	68.68	237.23	402.11	8.43	1.84	5.49	0.49	77.57
7891-2	0.95	91.08	3.60	34.77	0.46	58.79	257.73	347.18	9.06	1.36	5.55	0.46	71.28
7892-2	1.00	88.95	3.36	39.20	1.10	101.48	176.18	555.27	9.09	1.60	5.51	0.50	82.61
样品编号	Hf	Co	Ni	Cr	V	Sc	Li	Cs	Be	Ga	Tl	Pb	As
17-36	2.01	1.82	0.29	4.59	16.45	4.11	6.68	3.79	1.71	13.67	0.49	14.93	1.32
17-40	2.99	2.31	3.01	8.17	19.54	4.42	13.81	2.11	1.76	15.50	0.49	17.52	1.92
17-42	2.33	2.31	2.66	8.17	17.10	3.61	12.19	1.46	1.70	12.65	0.33	12.79	2.65
7885-1	2.26	0.27	0.77	2.78	7.85	6.35	3.95	1.86	1.73	12.86	0.46	19.44	3.69
7890-1	2.62	1.79	0.95	3.11	18.16	6.02	7.11	2.37	2.50	13.48	0.37	12.56	7.72
7891-2	2.23	1.78	1.18	2.19	23.55	5.38	3.61	1.58	0.93	12.99	0.29	16.98	6.65
7892-2	2.35	1.90	1.43	3.53	18.42	5.99	6.86	3.49	2.29	14.04	0.56	15.53	2.04
样品编号	Bi	Ge	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er
17-36	0.10	1.04	18.99	35.58	3.48	11.68	2.15	0.44	1.77	0.25	1.40	0.29	0.87
17-40	0.04	1.17	23.11	44.67	4.26	15.22	2.64	0.54	2.04	0.32	1.77	0.41	1.10
17-42	0.04	1.09	18.02	34.24	3.49	11.95	2.18	0.43	1.62	0.25	1.40	0.30	0.97
7885-1	0.02	1.20	17.01	35.46	3.16	11.13	2.15	0.40	1.61	0.26	1.51	0.35	0.94
7890-1	0.02	1.27	18.36	36.22	3.25	9.76	1.97	0.40	1.56	0.25	1.36	0.31	0.82
7891-2	0.05	1.02	20.48	40.00	3.69	11.86	2.17	0.42	1.60	0.26	1.46	0.32	0.88
7892-2	0.07	0.90	21.02	37.74	3.68	10.72	2.13	0.49	1.65	0.27	1.44	0.32	0.95
样品编号	Tm	Yb	Lu	Y	La/Nb	Nb/Ta	Sm/Nd	REE	LREE/ HREE	(La/ Yb)_N	(La/ Sm)_N	δEu	δCe
17-36	0.14	0.93	0.16	9.39	3.36	12.16	0.18	78.11	12.48	13.44	5.37	0.69	1.02
17-40	0.18	1.29	0.22	12.21	3.55	10.67	0.17	97.76	12.34	11.80	5.34	0.71	1.05
17-42	0.14	1.02	0.18	9.97	3.77	10.65	0.18	76.17	11.99	11.71	5.03	0.70	1.01
7885-1	0.14	1.16	0.18	11.66	2.79	12.76	0.19	75.47	11.28	9.71	4.82	0.67	1.13
7890-1	0.13	0.94	0.16	10.86	3.34	11.31	0.20	75.48	12.67	12.91	5.69	0.70	1.10
7891-2	0.14	1.02	0.14	11.28	3.69	12.03	0.18	84.43	13.53	13.24	5.76	0.70	1.08
7892-2	0.14	1.05	0.16	10.77	3.81	10.94	0.20	81.76	12.67	13.23	6.03	0.80	1.00

样号编号	t/Ma	Rb	Sr	Sm	Nd	¹⁴⁷Sm/ ¹⁴⁴Nd	¹⁴³Nd/ ¹⁴⁴Nd	ε_Nd(t)	T_DM/Ma	⁸⁷Rb/ ⁸⁶Sr	⁸⁷Sr/ ⁸⁶Sr	I_Sr	I_Nd	ε_Sr(t)
17-36	90.67	89.29	196.59	2.15	11.68	0.111 5	0.512 716	2.51	650	1.315 2	0.706 284	0.704 59	0.512 650	2.8
17-40	90.67	90.90	242.56	2.64	15.22	0.104 9	0.512 708	2.43	621	1.085 1	0.706 084	0.704 69	0.512 646	4.2
17-42	90.67	53.68	187.21	2.18	11.95	0.110 5	0.512 689	2.00	684	0.830 2	0.705 708	0.704 64	0.512 624	3.5