东昆仑小灶火地区钼矿化正长花岗岩年代学、地球化学特征及其地质意义

doi:10.11872/j.issn.1005-2518.2018.04.465

Abstract

Abstract:

Xiaozaohuo area is located in the northern region of the Middle Kunlun magmatic arc，next to the Qimantage back-arc basin in the north，which is one of the large number of copper molybdenum polymetallic mineralized points in Lalingzaohuo monoblock exploration area.The ore-bearing intrusion is syenogranite.Detailed studies on geochronology，element geochemical were carried out for the syenogranite.The results show that the age of syenogranite is （226±1）Ma，geochemical analysis show that it belongs to shoshonitic series，with weaker Eu negative anomaly （0.75～0.86），depleted of Nb，Ta，Ti，P，Ba，rich in Rb，Th，U，K；Rb/Sr ratios of 1.90 on average，Nb/Ta ratios of 11.33 on average，these characteristics are reflected the crust sources of the magma genesis.Combined with studies of igneous diagenetic assemblages in this area，this paper proposed that the diagenetic mineralization setting in Xiaozaohuo area is post-collision intracontinental orogenic stage in the late Triassic.

Key words: syenogranite, zircon U-Pb age, geochemistry, post-collision stage, molybdenum polymetallic ore, Xiaozaohuo, east Kunlun

CLC Number:

P618.65

Jing CHEN,Jichun HU,Yongzhuo LU,Shiying LU,Shulin WANG,Beibei XU. Geochronology，Geochemical Characteristics of Molybdenum Ore-bearing Syenogranite from Xiaozhaohuo Area in East Kunlun and Its Geological Significance[J].Gold Science and Technology, 2018, 26(4): 465-472.

Figures/Tables 9

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测点编号	含量（×10^-6）及比值			同位素比值及误差						年龄及误差
测点编号	²³⁸U	²³²Th	²³²Th/²³⁸U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁶Pb/²³⁸U	1σ
1	326.94	216.73	0.66	0.05793	0.00263	0.2854	0.01240	0.03572	0.00042	226	3
2	374.34	208.12	0.56	0.05433	0.00383	0.26757	0.01830	0.03571	0.00062	226	4
3	395.31	189.35	0.48	0.05925	0.00201	0.29372	0.00939	0.03595	0.00032	228	2
4	359.78	266.71	0.74	0.04898	0.00168	0.24110	0.00783	0.03570	0.00030	226	2
5	693.50	440.25	0.63	0.04605	0.00277	0.22469	0.01305	0.03539	0.00054	224	3
6	657.32	359.52	0.55	0.06043	0.00269	0.29869	0.01271	0.03584	0.00042	227	3
7	490.92	350.41	0.71	0.05873	0.00649	0.28267	0.03074	0.03491	0.00070	221	4
8	517.31	357.25	0.69	0.05016	0.00178	0.24696	0.00832	0.03571	0.00031	226	2
9	527.93	336.54	0.64	0.05116	0.00126	0.25231	0.00566	0.03576	0.00023	226	1
10	523.05	279.68	0.53	0.05250	0.00207	0.25912	0.00975	0.03579	0.00035	227	2
11	347.92	251.36	0.72	0.05393	0.00163	0.26560	0.00746	0.03571	0.00028	226	2
12	836.68	729.23	0.87	0.05047	0.00353	0.24607	0.01674	0.03536	0.00057	224	4
13	436.40	307.08	0.70	0.05415	0.00305	0.26383	0.01465	0.03534	0.00036	224	2
14	607.12	159.45	0.26	0.05286	0.00246	0.26142	0.01166	0.03586	0.00041	227	3
15	540.32	330.61	0.61	0.06155	0.00294	0.30362	0.01392	0.03577	0.00045	227	3
16	617.61	346.15	0.56	0.06802	0.00321	0.32634	0.01502	0.03480	0.00035	220	2

元素	样品编号及元素含量
元素	样品一	样品二	样品三	样品四
SiO₂	73.51	73.02	77.20	77.36
TiO₂	0.30	0.28	0.09	0.09
Al₂O₃	13.82	13.77	12.18	11.98
Fe₂O₃	0.96	1.44	0.64	0.66
FeO	0.77	0.71	0.35	0.38
MnO	0.044	0.042	0.03	0.02
MgO	0.58	0.34	0.19	0.21
CaO	0.86	0.94	0.74	0.75
Na₂O	3.29	3.63	3.53	3.42
K₂O	4.6	4.96	4.6	4.59
P₂O₅	0.08	0.066	0.01	0.02
H₂O⁺	1.14	0.68	0.48	0.80
LOS	0.61	0.17	0.26	0.20
A/CNK	1.156	1.055	1.004	1.002
La	34.5	30.7	23.4	20.8
Ce	61.93	62.04	52.06	43.34
Pr	8.83	7.45	6.03	5.20
Nd	25.90	24.70	20.70	17.30
Sm	4.94	4.27	3.66	3.01
Eu	1.08	1.03	0.83	0.79
Gd	3.62	3.62	2.82	2.48
Tb	0.57	0.54	0.38	0.37
Dy	2.59	2.78	1.70	1.83
Ho	0.59	0.58	0.31	0.35
Er	1.31	1.23	1.542	1.282
Tm	0.25	0.29	0.12	0.15
Yb	1.49	1.93	0.72	0.96
Lu	0.25	0.32	0.11	0.15
Rb	1 90	1 61	203.2	214.3
Ba	897	887	359.1	450.8
Th	8.94	25.00	16.23	16.72
Ta	0.76	1.24	1.633	1.333
Nb	10.60	12.50	16.92	14.57
Hf	4.05	4.89	2.931	2.728
Zr	148	166	72.98	70.65
Sm	4.13	3.79	4.272	3.198
Y	13.00	12.10	16.27	13.81
Sr	206	345	63.82	70.47
ΣREE	147.85	141.48	114.38	98.01
（La/Yb）_N	16.61	11.41	23.31	15.54
σEu	0.75	0.78	0.76	0.86

Geochronology，Geochemical Characteristics of Molybdenum Ore-bearing Syenogranite from Xiaozhaohuo Area in East Kunlun and Its Geological Significance

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