Trace Elements Composition of Pyrites in the Cangshang Gold Deposit,Jiaodong: Implications for Source of Ore-forming Fluid and Material

doi:10.19657/j.geoscience.1000-8527.2023.070

Abstract

Abstract:

The Jiaodong gold province in North China Craton is one of the largest goldfields in China,with proven gold reserves over 5,000 tons.As an important gold deposit type in this region,disseminated ore has been widely studied for a long time,but the properties of ore-forming fluids and the sources of ore-forming materials are still controversial.Based on the LA-ICP-MS pyrite analysis on the typical disseminated gold ore (from the Cangshang gold deposit)in northwestern Jiaodong,we discussed the ore-forming fluid properties and material sources of the deposit,which provides new constraints for further understanding of the ore-forming process.The results show that the pyrite Se content of the Cangshang gold deposit is relatively low (mean 1.601×10^-6),indicating that the deposit may be mainly formed by sedimentary metamorphism.The Au/As ratio indicates that Au occurs in the form of lattice gold (Au⁺) in pyrite during the mineralization stages Ⅱ and Ⅲ.Combined with the published results on the Jiaodong ore-fluid properties,the relatively uniform Co/Ni ratios and the rise of the major pyrite Ag content at Cangshang indicate that the ore-forming fluid is mainly magmatic,with certain input of metamorphic water and meteoric water.The low Te content indicates that the ore-forming material was less likely mantle-derived.However,the low Co and Ni contents are significantly different from the magmatic pyrite characteristics,suggesting that the ore-forming material may be mixed with minor mantle components.Combined with the tectono-magmatic events of the Jiaodong metallogenic period (about 120 Ma),it is suggested that the gold and relevant ore-forming materials may have sourced from the Precambrian metamorphic basement remobilized by Mesozoic activation and mixed with minor mantle components.

Key words: Cangshang gold deposit, pyrite, ore-forming fluid, ore-forming material

CLC Number:

P595
P618.51

RAN Xiaoyu, MA Yao, LIANG Yayun, LIU Xuefei. Trace Elements Composition of Pyrites in the Cangshang Gold Deposit,Jiaodong: Implications for Source of Ore-forming Fluid and Material[J]. Geoscience, 2023, 37(06): 1495-1508.

Figures/Tables 10

References 73

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成矿阶段	样号	Co	Ni	Sb	Pb	Bi	Se	Sn	Au	Ag	Cu	Zn	As	Te	Mn	Fe	Mo	Cd	Gd	Hf	Tl
Ⅱ阶段	CS-9-5-1	0.338	3.220	2.961	11.041	0.079	1.890	0.129	-	0.450	32.534	6.446	5.657	0.152	-	465000	-	-	-	-	-
	CS-9-5-2	0.036	-	0.037	0.244	0.010	1.485	0.125	-	-	-	-	18.376	-	-	465000	-	-	-	-	-
	CS-9-5-3	0.101	3.037	0.481	4.416	0.046	2.078	0.145	0.098	0.079	0.812	0.183	2948.560	-	-	465000	-	-	0.017	-	-
	CS-9-4-1	-	-	0.147	1.159	0.025	1.294	0.123	0.092	0.014	-	-	4786.972	-	0.138	465000	-	-	-	-	-
	CS-9-4-2	0.028	-	-	0.194	-	1.473	0.119	0.109	-	-	0.183	4544.973	-	-	465000	-	-	-	-	-
	CS-9-3-1	0.037	0.073	0.392	1.810	0.020	1.328	0.135	0.023	0.249	0.219	0.176	1894.910	-	-	465000	-	-	-	-	-
	CS-9-3-2	-	-	-	0.185	-	1.380	0.127	0.078	0.029	0.128	-	3842.034	-	-	465000	-	-	-	-	-
	CS-9-2-1	122.782	14.966	0.110	206.152	36.639	1.340	0.134	0.010	5.148	75.949	2.327	37.846	0.793	-	465000	0.104	-	0.016	-	-
	CS-9-2-2	0.027	1.163	0.311	3.102	0.035	1.732	0.132	0.092	0.179	0.379	0.174	2311.753	0.132	-	465000	-	-	-	-	-
	CS-9-2-3	76.635	41.084	0.453	163.950	176.089	2.012	0.174	0.044	27.400	287.387	10.466	141.067	1.269	-	465000	-	0.259	0.005	0.004	-
Ⅲ阶段	CS-10-1-1	0.049	0.602	0.420	3.715	0.806	2.324	0.136	0.042	1.055	1.037	0.196	3183.784	-	-	465000	-	-	0.006	0.439	0.009
	CS-10-1-2	0.016	-	0.388	58.461	5.025	2.336	0.147	0.012	1.576	1.509	0.155	72.877	2.092	-	465000	0.127	-	-	-	-
	CS-10-1-3	-	0.161	3.145	7.585	2.300	1.682	0.112	0.678	6.497	5.671	0.284	3600.889	0.509	-	465000	-	0.044	-	-	0.112
	CS-10-2-1	0.084	0.674	0.054	0.695	0.282	-	0.144	0.082	0.027	0.206	-	4584.149	-	-	465000	-	-	-	-	-
	CS-10-2-2	1.958	0.847	-	0.094	0.054	2.050	0.149	-	-	-	-	436.279	-	-	465000	-	-	-	-	-
	CS-10-2-3	0.105	1.620	0.037	0.427	0.085	1.520	0.126	0.050	0.028	0.205	0.230	2878.536	-	-	465000	0.053	-	-	0.047	-
	CS-10-3-1	0.091	0.819	0.046	0.556	0.033	1.281	0.122	0.089	0.019	-	0.294	3221.840	0.195	-	465000	-	-	-	0.179	-
	CS-10-3-2	-	-	0.698	223.663	11.491	1.549	0.151	-	17.125	2677.792	8.644	3.036	-	-	465000	0.109	-	-	-	-
	CS-10-3-3	0.967	4.950	0.732	1835.110	375.915	2.066	0.119	0.084	147.872	36.578	2.525	1067.693	6.273	-	465000	-	0.263	-	-	0.011
	CS-10-4-1	0.206	-	0.067	57.144	14.947	1.578	0.123	0.013	6.482	43.548	1.066	308.918	0.607	-	465000	0.044	-	-	-	-
	CS-10-4-2	4.404	9.665	0.037	0.715	1.457	1.513	0.112	0.037	0.093	0.207	-	2336.140	0.226	-	465000	-	-	-	0.026	-
	CS-10-5-1	0.436	-	0.380	1553.841	337.566	2.529	0.175	0.111	152.034	172.713	2.922	384.058	9.808	-	465000	-	0.214	-	-	0.015
	CS-10-5-2	0.374	-	-	0.123	0.060	1.907	0.160	-	-	-	-	23.141	-	-	465000	-	-	0.006	-	-
	CS-10-5-3	0.173	0.454	1.369	8.557	2.605	1.991	0.186	0.202	0.483	1.148	0.338	3978.333	-	-	465000	-	-	-	0.056	-

成矿阶段	样号	Co	Ni	Sb	Pb	Bi	Se	Sn	Au	Ag	Cu	Zn	As	Te	Mn	Fe	Mo	Cd	Gd	Hf	Tl
Ⅱ阶段	CS-9-5-1	0.338	3.220	2.961	11.041	0.079	1.890	0.129	-	0.450	32.534	6.446	5.657	0.152	-	465000	-	-	-	-	-
	CS-9-5-2	0.036	-	0.037	0.244	0.010	1.485	0.125	-	-	-	-	18.376	-	-	465000	-	-	-	-	-
	CS-9-5-3	0.101	3.037	0.481	4.416	0.046	2.078	0.145	0.098	0.079	0.812	0.183	2948.560	-	-	465000	-	-	0.017	-	-
	CS-9-4-1	-	-	0.147	1.159	0.025	1.294	0.123	0.092	0.014	-	-	4786.972	-	0.138	465000	-	-	-	-	-
	CS-9-4-2	0.028	-	-	0.194	-	1.473	0.119	0.109	-	-	0.183	4544.973	-	-	465000	-	-	-	-	-
	CS-9-3-1	0.037	0.073	0.392	1.810	0.020	1.328	0.135	0.023	0.249	0.219	0.176	1894.910	-	-	465000	-	-	-	-	-
	CS-9-3-2	-	-	-	0.185	-	1.380	0.127	0.078	0.029	0.128	-	3842.034	-	-	465000	-	-	-	-	-
	CS-9-2-1	122.782	14.966	0.110	206.152	36.639	1.340	0.134	0.010	5.148	75.949	2.327	37.846	0.793	-	465000	0.104	-	0.016	-	-
	CS-9-2-2	0.027	1.163	0.311	3.102	0.035	1.732	0.132	0.092	0.179	0.379	0.174	2311.753	0.132	-	465000	-	-	-	-	-
	CS-9-2-3	76.635	41.084	0.453	163.950	176.089	2.012	0.174	0.044	27.400	287.387	10.466	141.067	1.269	-	465000	-	0.259	0.005	0.004	-
Ⅲ阶段	CS-10-1-1	0.049	0.602	0.420	3.715	0.806	2.324	0.136	0.042	1.055	1.037	0.196	3183.784	-	-	465000	-	-	0.006	0.439	0.009
	CS-10-1-2	0.016	-	0.388	58.461	5.025	2.336	0.147	0.012	1.576	1.509	0.155	72.877	2.092	-	465000	0.127	-	-	-	-
	CS-10-1-3	-	0.161	3.145	7.585	2.300	1.682	0.112	0.678	6.497	5.671	0.284	3600.889	0.509	-	465000	-	0.044	-	-	0.112
	CS-10-2-1	0.084	0.674	0.054	0.695	0.282	-	0.144	0.082	0.027	0.206	-	4584.149	-	-	465000	-	-	-	-	-
	CS-10-2-2	1.958	0.847	-	0.094	0.054	2.050	0.149	-	-	-	-	436.279	-	-	465000	-	-	-	-	-
	CS-10-2-3	0.105	1.620	0.037	0.427	0.085	1.520	0.126	0.050	0.028	0.205	0.230	2878.536	-	-	465000	0.053	-	-	0.047	-
	CS-10-3-1	0.091	0.819	0.046	0.556	0.033	1.281	0.122	0.089	0.019	-	0.294	3221.840	0.195	-	465000	-	-	-	0.179	-
	CS-10-3-2	-	-	0.698	223.663	11.491	1.549	0.151	-	17.125	2677.792	8.644	3.036	-	-	465000	0.109	-	-	-	-
	CS-10-3-3	0.967	4.950	0.732	1835.110	375.915	2.066	0.119	0.084	147.872	36.578	2.525	1067.693	6.273	-	465000	-	0.263	-	-	0.011
	CS-10-4-1	0.206	-	0.067	57.144	14.947	1.578	0.123	0.013	6.482	43.548	1.066	308.918	0.607	-	465000	0.044	-	-	-	-
	CS-10-4-2	4.404	9.665	0.037	0.715	1.457	1.513	0.112	0.037	0.093	0.207	-	2336.140	0.226	-	465000	-	-	-	0.026	-
	CS-10-5-1	0.436	-	0.380	1553.841	337.566	2.529	0.175	0.111	152.034	172.713	2.922	384.058	9.808	-	465000	-	0.214	-	-	0.015
	CS-10-5-2	0.374	-	-	0.123	0.060	1.907	0.160	-	-	-	-	23.141	-	-	465000	-	-	0.006	-	-
	CS-10-5-3	0.173	0.454	1.369	8.557	2.605	1.991	0.186	0.202	0.483	1.148	0.338	3978.333	-	-	465000	-	-	-	0.056	-