东昆仑祁漫塔格地区库德尔特金矿区花岗闪长岩的时代、成因及其构造意义

doi:10.11872/j.issn.1005-2518.2023.01.136

Abstract

Abstract:

The Kudeerte gold deposit is a medium-sized gold deposit newly discovered in the western section of East Kunlun.Granodiorite is the host rock of gold deposit，but the petrogenesis，tectonic background and its relationship with mineralization are still unclear.The above questions have been discussed by studying the petrogeochemistry，U-Pb zircon geochronology，and Hf isotopes of the granodiorite in Kudeerte.The petrogeochemical characteristics show that the Kudeerte granodiorite is a set of quasi-aluminum-potassium basalt rocks，showing a right-inclined distribution pattern of light rare earth enrichment，with obvious negative Eu anoalies.The relative enrichment of elements such as large-ion lithophile elements Rb and K，the active incompatible elements Th and U，the depleted high field strength （Nb，Ta，Ti），HREE，and Sr elements，with the characteristics of shell-derived magma.Zircon LA-ICP-MS U-Pb dating showes that the age of granodiorite was （242.9±1.3）Ma（n=20，MSWD=0.65）.The Kudeerte granodiorite is a Ⅰ-type granitic rock series of aluminous high potassium calc-alkaline rocks formed in the Middle Triassic.The tectonic environment is the transition environment between subduction and collision of oceanic plate.

Key words: granodiorite, zircon U-Pb dating, geochemistry characteristics, gold deposit, Kudeerte, Qimantage of East Kunlun

CLC Number:

P618.51

Yong ZHANG,Aikui ZHANG,Shuyue HE,Zhigang LIU,Yongle LIU,Peng ZHANG,Feifei SUN. Age，Petrogenesis and Tectonic Significance of Granodiorite in Kudeerte Gold Deposit，Qimantage Area，East Kunlun[J].Gold Science and Technology, 2023, 31(1): 1-14.

Figures/Tables 11

Fig.1

Fig.2

Fig.3

Table 1

Fig.4

Fig.5

Fig.6

Table 2

LA-ICP-MS U-Pb isotopic analysis results of zircon from the granodiorite in Kudeerte gold deposit"

测点	元素含量/（×10^-6）			Th/U	同位素比值						表面年龄/Ma
测点	U	Th	Pb	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
1	572	378	29	0.66	0.05210	0.00100	0.2817	0.0056	0.03921	0.00030	290	44	252	4	248	2
2	469	289	22	0.62	0.05116	0.00113	0.2695	0.0057	0.03843	0.00048	248	51	242	5	243	3
3	507	326	22	0.64	0.05181	0.00163	0.2696	0.0074	0.03817	0.00072	277	72	242	6	241	4
4	505	345	24	0.68	0.05136	0.00077	0.2686	0.0044	0.03793	0.00036	257	34	242	3	240	2
5	679	351	29	0.52	0.05204	0.00152	0.2732	0.0077	0.03848	0.00072	287	67	245	6	243	4
6	664	531	29	0.80	0.05118	0.00189	0.2672	0.0083	0.03816	0.00055	249	85	240	7	241	3
7	679	473	30	0.70	0.05250	0.00174	0.2715	0.0089	0.03803	0.00084	307	75	244	7	241	5
8	669	416	31	0.62	0.05110	0.00089	0.2683	0.0046	0.03817	0.00035	245	40	241	4	241	2
9	801	334	60	0.42	0.05447	0.00051	0.4991	0.0067	0.06640	0.00069	391	21	411	5	414	4
10	564	315	24	0.56	0.05117	0.00134	0.2695	0.0073	0.03827	0.00064	248	60	242	6	242	4
11	632	405	28	0.64	0.05313	0.00089	0.2857	0.0065	0.03905	0.00065	334	38	255	5	247	4
12	831	610	37	0.73	0.05088	0.00075	0.2693	0.0052	0.03836	0.00053	236	34	242	4	243	3
13	1 463	520	57	0.36	0.05150	0.00155	0.2715	0.0069	0.03843	0.00092	263	69	244	5	243	6
14	652	352	27	0.54	0.05103	0.00130	0.2685	0.0063	0.03836	0.00087	242	59	242	5	243	5
15	565	304	24	0.54	0.05152	0.00109	0.2694	0.0063	0.03817	0.00081	264	49	242	5	241	5
16	879	572	37	0.65	0.05127	0.00138	0.2703	0.0057	0.03849	0.00088	253	62	243	5	243	5
17	917	754	42	0.82	0.05141	0.00115	0.2814	0.0063	0.03994	0.00094	259	52	252	5	252	6
18	753	326	31	0.43	0.05184	0.00172	0.2746	0.0064	0.03893	0.00094	278	76	246	5	246	6
19	1 549	666	62	0.43	0.05527	0.00142	0.2953	0.0048	0.03899	0.00088	423	57	263	4	247	5
20	528	319	23	0.60	0.05567	0.00139	0.2962	0.0071	0.03897	0.00090	439	56	263	6	246	6
21	563	312	24	0.55	0.05168	0.00123	0.2718	0.0053	0.03859	0.00087	271	55	244	4	244	5
22	478	231	20	0.48	0.05171	0.00152	0.2696	0.0070	0.03831	0.00085	273	67	242	6	242	5
23	370	159	15	0.43	0.05172	0.00123	0.2725	0.0055	0.03852	0.00057	273	55	245	4	244	4
24	525	485	25	0.92	0.05078	0.00080	0.2696	0.0047	0.03852	0.00040	231	37	242	4	244	2
25	605	361	28	0.60	0.05076	0.00102	0.2690	0.0056	0.03831	0.00027	230	47	242	4	242	2
26	569	337	24	0.59	0.05186	0.00143	0.2693	0.0071	0.03792	0.00085	279	63	242	6	240	5
27	730	396	30	0.54	0.05490	0.00137	0.2854	0.0069	0.03796	0.00080	408	56	255	5	240	5
28	560	335	24	0.60	0.05129	0.00105	0.2778	0.0083	0.03928	0.00081	254	47	249	7	248	5
29	559	268	25	0.48	0.05109	0.00134	0.2742	0.0074	0.03879	0.00066	245	60	246	6	245	4
30	686	600	31	0.87	0.05207	0.00152	0.2714	0.0095	0.03803	0.00080	289	67	244	8	241	5

Table 2

Table 3

Fig.7

Fig.8

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样品编号	SiO₂	TiO₂	Al₂O₃	TFe₂O₃	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	LOI	Total	Na₂O+K₂O	K₂O/Na₂O	A/CNK	A/NK
KDEG6	65.34	0.42	14.84	4.58	0.55	1.91	4.68	2.03	4.02	0.09	1.09	99.56	6.05	1.98	0.916	1.931
KDEG7	67.69	0.45	14.94	3.46	0.18	1.27	4.92	1.74	4.35	0.11	0.94	100.06	6.10	2.49	0.904	1.971
KDEG8	65.80	0.50	14.83	4.18	0.55	1.64	4.13	2.36	4.19	0.11	1.62	99.90	6.55	1.77	0.932	1.761
KDEG9	65.43	0.59	14.31	4.41	0.55	1.33	5.11	2.44	3.99	0.15	1.36	99.69	6.43	1.64	0.812	1.717
KDEG10	65.50	0.65	14.72	3.87	0.56	0.91	4.77	2.36	4.82	0.19	1.37	99.71	7.18	2.04	0.829	1.618
样品编号	σ	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y
KDEG6	1.61	26.1	48.1	5.65	19.10	3.26	0.89	3.03	0.47	2.85	0.60	1.71	0.27	1.75	0.29	14.7
KDEG7	1.49	36.6	66.6	7.08	23.50	4.33	1.15	4.18	0.63	3.51	0.76	2.19	0.35	2.16	0.36	19.7
KDEG8	1.85	28.8	54.2	6.54	21.80	3.86	1.07	3.63	0.56	3.23	0.68	1.90	0.31	1.89	0.33	17.4
KDEG9	1.81	23.4	47.4	5.50	18.80	3.45	0.90	3.12	0.49	2.98	0.60	1.73	0.28	1.72	0.28	14.5
KDEG10	2.25	19.1	37.6	4.50	15.10	2.60	0.70	2.45	0.38	2.39	0.47	1.46	0.24	1.51	0.25	11.5
样品编号	ΣREE	LREE/HREE	（La/Yb）_N	δEu	δCe	Rb	Ba	Th	U	Ta	Nb	Sr	P	Zr	Hf
KDEG6	114.09	9.40	10.06	0.85	0.90	101.0	509	20.3	3.98	0.99	7.95	173	376	137	11.2
KDEG7	153.35	9.84	11.42	0.82	0.92	133.0	605	15.7	4.54	1.30	8.68	134	492	149	15.3
KDEG8	128.79	9.28	10.28	0.86	0.90	109.0	583	16.6	4.35	1.13	8.67	179	491	163	15.6
KDEG9	110.66	8.87	9.20	0.82	0.95	94.8	567	15.7	3.66	0.97	8.36	214	672	135	12.0
KDEG10	88.70	8.69	8.53	0.84	0.93	85.7	459	15.3	3.35	0.91	7.42	156	809	142	30.1

样品编号	年龄/Ma	¹⁷⁶Yb/¹⁷⁷Hf	2σ	¹⁷⁶Lu/¹⁷⁷Hf	2σ	¹⁷⁶Hf/¹⁷⁷Hf	2σ	ε_Hf（t）	2σ	T_DM1/Ma	T_DM2/Ma	f_Lu/Hf
1	248	0.034370	0.000180	0.001338	0.000010	0.282561	0.000019	-2.2	0.7	987	1416	-0.96
2	243	0.032313	0.000160	0.001245	0.000009	0.282551	0.000018	-2.7	0.6	998	1440	-0.96
3	241	0.031487	0.000637	0.001297	0.000021	0.282608	0.000025	-0.7	0.9	919	1314	-0.96
4	240	0.033699	0.000481	0.001361	0.000012	0.282599	0.000021	-1.1	0.7	933	1336	-0.96
5	243	0.031982	0.000454	0.001266	0.000018	0.282570	0.000019	-2.0	0.7	972	1398	-0.96
6	241	0.038438	0.000487	0.001442	0.000013	0.282609	0.000022	-0.7	0.8	921	1313	-0.96
7	241	0.034421	0.000249	0.001243	0.000005	0.282573	0.000020	-1.9	0.7	967	1392	-0.96
8	241	0.018380	0.000206	0.000714	0.000009	0.282538	0.000017	-3.1	0.6	1003	1466	-0.98
10	242	0.022256	0.000456	0.000911	0.000019	0.282622	0.000021	-0.1	0.7	890	1278	-0.97
12	243	0.028724	0.000750	0.001022	0.000019	0.282548	0.000018	-2.7	0.6	997	1445	-0.97
13	243	0.023872	0.000728	0.000895	0.000027	0.282555	0.000022	-2.5	0.8	983	1428	-0.97
14	243	0.034417	0.000665	0.001193	0.000017	0.282584	0.000024	-1.5	0.8	950	1366	-0.96
15	241	0.035759	0.000710	0.001424	0.000022	0.282604	0.000027	-0.9	1.0	928	1324	-0.96
16	243	0.037584	0.000263	0.001350	0.000005	0.282649	0.000023	0.8	0.8	862	1221	-0.96
17	252	0.030804	0.000185	0.001211	0.000009	0.282564	0.000026	-2.0	0.9	979	1406	-0.96
18	246	0.030506	0.000849	0.001141	0.000033	0.282635	0.000024	0.4	0.8	877	1249	-0.97
21	244	0.040200	0.001700	0.001483	0.000035	0.282533	0.000026	-3.3	0.9	1030	1483	-0.96
22	242	0.049473	0.001263	0.001777	0.000049	0.282585	0.000022	-1.6	0.8	964	1370	-0.95
23	244	0.024856	0.000551	0.000941	0.000013	0.282576	0.000025	-1.7	0.9	955	1381	-0.97
24	244	0.026740	0.000273	0.001095	0.000008	0.282631	0.000018	0.2	0.6	881	1259	-0.97

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Age，Petrogenesis and Tectonic Significance of Granodiorite in Kudeerte Gold Deposit，Qimantage Area，East Kunlun

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