青海赛坝沟金矿辉长岩地球化学组成及成因分析

doi:10.11872/j.issn.1005-2518.2022.05.169

Abstract

Abstract:

The Saibagou gold deposit is one of the medium-size gold deposits located in the Wulan-Dulan strategic metallic ore concentration area in northern Qaidam Basin.The regional tectonic location spans the Tanjianshan magmatic arc，ophiolite melange in the northern Qaidam Basin and Olongbulak microcontinent，and is located at the intersection of Wahongshan-Wenquan fracture and Yuka-Wulan fracture.The formation of the deposit is strictly controlled by the fracture structure.There are two groups of fracture belts in the mining area，namely the NW trending thrust fracture and the NE trending shift fracture，and the gold orebody are mainly developed in the NW brittle-ductile shearing belt in veins，irregular，branched veins and lenticular.The main ore types are structural altered rock type and quartz vein type.Magmatism in the mining area is strong，and the active ages mainly include Late Variscan-Indosinian and Neoproterozoic，especially the Variscan magmatic activity is the most significant.Magmatic rocks exposed in the mining area are mainly gabbro and granite，in which gabbro and ore body have close spatial correlation.The magmatic rock samples used in this study were all taken from fresh gabbro after stripping regolith around the orebody of Saibagou gold deposit.The element analysis of the whole rock was conducted by the Qinghai Nuclear Industry Geological Bureau，including the detection of major elements，trace elements and rare earth elements.The results show that all gabbro in Saibagou gold deposit are tholeiite basalt，mainly alkaline gabbro and subalkaline gabbro，most of which are calcalkaline series or low potassium （tholeiite） series gabbro，and a small amount of shoshonite series gabbro exist.Gabbros are characterized by high total alkali content，enrichment of Na，Al and light rare earth elements，strong enrichment of large ion lithophile elements Sr，and depletion of high field strength elements Nb and Ti.Through in-depth analysis and comparison of the La/Nb and Zr/Ba values，Hake diagram，Rb/Y-Nb/Y ratio diagram，La-La/Sm diagram，La/Yb-Nb/Ta diagram and Th/Nb-Ce/Nb diagram of gabbro in Saibaigou gold deposit，it is determined that the gabbro primary magma of Saibagou gold deposit originated from the lithospheric mantle magma which experienced fractional crystallization，assimilation and contamination，and partial melting during the the process of ascending and invaded，and intruded into the shallow crust to form gabbro primitive magma.

Key words: lithospheric mantle, geochemistry, gabbro, petrogenesis, magmatic origin, Saibagou gold deposit, Qinghai Province

CLC Number:

P618.51

Jia XING,Jianguo WANG,Zhinan WANG,Jian HU,Shengyun WEI. Geochemical Composition and Genetic Analysis of Gabbro of Saibagou Gold Deposit，Qinghai Province[J].Gold Science and Technology, 2022, 30(5): 664-675.

Figures/Tables 14

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组分	样品编号及分析结果/%
组分	SBG-1	SBG-2	SBG-3	SBG-4	SBG-5	SBG-6	SBG-7	SBG-8	SBG-9
SiO₂	46.98	46.20	45.35	50.89	52.23	48.04	44.12	45.01	47.46
TiO₂	0.37	0.12	0.61	0.36	0.38	1.18	0.81	0.63	1.61
Al₂O₃	13.12	15.28	16.17	13.89	14.64	11.57	17.67	15.06	12.12
TFe₂O₃	11.12	5.97	11.97	10.78	11.28	9.85	13.43	10.43	15.19
MnO	0.18	0.13	0.13	0.19	0.18	0.18	0.22	0.17	0.23
MgO	9.53	13.91	4.98	5.09	5.90	10.48	6.16	9.15	6.42
CaO	11.35	14.01	17.32	10.27	8.15	12.02	11.64	10.37	7.20
Na₂O	1.18	0.89	1.52	1.18	1.58	1.83	1.74	2.33	2.64
K₂O	0.30	0.57	0.08	0.22	0.16	2.16	0.24	0.57	0.44
P₂O₅	0.02	0.01	0.08	0.07	0.07	0.50	0.16	0.12	0.15
SO₃	0.02	0.01	0.01	0.02	0.01	0.05	0.37	0.01	0.09
LOI	5.82	2.89	1.80	7.04	5.42	2.16	3.43	6.16	6.45
Total	99.99	99.99	100.02	100.00	100.00	100.02	99.99	100.01	100.00

组分	样品编号及分析结果/（×10^-6）
组分	SBG-1	SBG-2	SBG-3	SBG-4	SBG-5	SBG-6	SBG-7	SBG-8	SBG-9
Rb	7.60	39.90	0.90	8.30	8.70	148.00	4.30	8.00	5.40
K	2 500	4 600	700	1 800	1 200	17 700	1 900	4 800	3 700
Ba	182.50	108.00	19.20	77.40	43.60	1 250	92.60	105.50	80.10
Th	0.53	0.16	0.52	0.45	0.59	12.60	0.97	1.37	0.54
U	0.33	0.05	0.64	0.12	0.15	4.00	0.27	0.20	0.35
Nb	0.40	0.30	2.50	1.10	1.20	16.30	3.60	1.40	4.90
Sr	555	187	977	275	297	1 105	534	300	135
P	90	30	340	290	300	2 090	730	520	640
Zr	14	4	44	15	15	484	23	49	112
Hf	0.40	0.10	1.10	0.50	0.50	10.50	0.90	1.30	2.90
Ti	2 120	700	3 610	2 080	2 180	6 850	4 610	3 760	9 360
Y	7.80	4.40	15.90	11.20	11.70	35.10	20.70	18.80	37.60
Yb	0.86	0.46	1.59	1.27	1.22	2.7	2.01	1.74	3.76
Lu	0.14	0.07	0.25	0.21	0.21	0.40	0.30	0.26	0.57
Zn	44	37	38	67	69	97	95	71	118
Sc	49.70	35.00	23.70	45.50	44.50	29.20	42.50	39.20	45.60
Cr	340	1 630	200	80	100	620	20	530	40
Co	45.60	35.60	20.50	26.00	28.40	33.00	38.30	44.30	47.70
Cd	0.03	0.04	0.09	0.09	0.05	0.12	0.08	0.08	0.09
Ag	0.01	0.01	0.01	0.01	0.01	0.01	0.03	0.01	0.16
Be	0.11	0.05	0.52	0.23	0.36	3.19	0.33	0.38	0.42
As	4.90	2.00	2.50	4.40	6.50	3.50	3.30	3.80	4.00
Bi	0.02	0.09	1.15	0.04	0.03	0.21	0.04	0.02	0.01
Cu	125.50	1.50	3.30	109.50	157.00	45.50	154.50	7.00	147.00
Ga	11.55	10.05	27.70	14.35	13.50	18.15	21.30	14.90	19.50
Ge	0.20	0.18	0.18	0.16	0.16	0.32	0.25	0.30	0.27
In	0.043	0.022	0.100	0.058	0.051	0.084	0.073	0.057	0.097
Mo	0.52	0.32	1.70	0.46	0.78	0.45	0.54	0.23	0.29
Zr/Ba	0.076	0.037	2.29	0.20	0.34	0.38	0.25	0.46	1.40

组分	样品编号及分析结果/（×10^-6）
组分	SBG-1	SBG-2	SBG-3	SBG-4	SBG-5	SBG-6	SBG-7	SBG-8	SBG-9
La	3.00	0.90	4.60	4.40	6.50	69.60	9.10	7.40	6.20
Ce	6.00	1.70	9.30	9.30	11.70	155.00	21.70	17.10	17.00
Pr	0.78	0.19	1.33	1.06	1.24	19.60	2.84	2.17	2.49
Nd	3.40	0.90	6.60	4.70	5.50	78.10	13.30	9.70	12.80
Sm	0.94	0.35	1.94	1.31	1.35	14.95	3.49	2.58	4.13
Eu	0.35	0.21	0.75	0.47	0.44	3.22	1.05	0.83	1.49
Gd	1.11	0.53	2.33	1.72	1.77	11.40	3.45	2.68	5.46
Tb	0.19	0.10	0.41	0.28	0.29	1.50	0.57	0.47	0.95
Dy	1.28	0.68	2.55	1.72	1.88	7.16	3.47	2.91	6.11
Ho	0.29	0.16	0.6	0.39	0.42	1.29	0.73	0.64	1.31
Er	0.85	0.46	1.73	1.24	1.15	3.28	2.03	1.85	3.91
Tm	0.13	0.07	0.26	0.19	0.18	0.47	0.30	0.27	0.60
Yb	0.86	0.46	1.59	1.27	1.22	2.70	2.01	1.74	3.76
Lu	0.14	0.07	0.25	0.21	0.21	0.40	0.30	0.26	0.57
∑REE	19.32	6.78	34.24	28.26	33.85	368.67	64.34	50.60	66.78
LREE	14.47	4.25	24.52	21.24	26.73	340.47	51.48	39.78	44.11
HREE	4.85	2.53	9.72	7.02	7.12	28.20	12.86	10.82	22.67
LREE/HREE	2.98	1.68	2.52	3.03	3.75	12.07	4.00	3.68	1.95
La_N/Yb_N	2.36	1.32	1.96	2.34	3.60	17.42	3.06	2.87	1.11
&Eu	1.05	1.49	1.08	0.96	0.87	0.73	0.91	0.96	0.96
&Ce	0.90	0.93	0.87	0.99	0.91	0.97	0.99	0.99	1.01

Geochemical Composition and Genetic Analysis of Gabbro of Saibagou Gold Deposit，Qinghai Province

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