太行山北段梨园金矿构造地球化学特征

doi:10.11872/j.issn.1005-2518.2021.01.074

Abstract

Abstract:

Liyuan gold deposit，a medium-sized gold deposit discovered in Lingqiu district，Shanxi Province，is located at the polymetallic metallogenic belt in the northern section of Taihang Mountain.The outcrop strata in the mining area is the Neo-Archean Fuping Group，which mainly consists of migmatite，gneiss and amphibolites.Faults are well developed and can be divided into four groups of NNE，NE，NW and near EW-trending among which the NNE-trending fault is the main ore-controlling structure.The orebodies mainly occur in the NNE-trending fault zone.In this study，a total of 677 tectonic geochemical samples were collected，and the contents of thirteen trace elements （Cu，Pb，Ni，Mn，Ag，Zn，Co，B，As，Sb，Bi，Hg，Au） were analyzed.The lower limit of each element anomaly is calculated by iterative method.Through correlation analysis，R cluster analysis and oblique factor analysis，the correlation of each element was studied，and the geological and geochemical environment of the Liyuan gold deposit was analyzed.The research result shows that the metallogenic element Au has a good correlation with Bi element，and bismuth minerals play an indicative role in mineralization.However，the correlation between Au and other elements is weak，shows the relative independence of gold during mineralization.Based on the above analysis，abnormal combinations of multiple geochemical elements are complete in the deposit，and can be classified as follows：Metallogenic element is Au，direct indicator elements are Cu-Pb-Zn-Ag，and indirect indicator elements are As-Sb-Hg.The denudation degree of the deposit is low.Spatial distribution of abnormal combinations shows that ore-forming element （Au） anomalies are mainly distributed in granite，diabase dike and strata with intense limonization.The distribution direction is NE-SW-trending，consistent with the regional tectonic line，and the gold mineralization is obviously controlled by the rock mass and the broken zone.The distribution range of abnormal assemblage of direct indicating elements overlap with that of metallogenic element，Au，Ag，Cu，Pb，Zn are the near-ore hole association，whose strong anomaly plays an important role in indicating gold mineralization.Also，this combination has great significance for concealed orebody.Indirect indicator element combination anomaly is mainly located in the distribution area of granite and diabase vein，indicating that the metallogenic rock body and the ore-forming process are rich of Cu elements.The strong anomaly of As，Sb and Hg indicates the upper and the leading edge of the ore body，which is closely related to gold mineralization.Therefore，the tectono-geochemical characteristic of Liyuan gold deposit was analyzed，which has certain instruction significance in metallogenic prediction and enriching the geochemical model of gold deposit in the study area.

Key words: multivariate statistical analysis, element anomaly combination, anomalous structure, tectono-geochemistry, Liyuan gold deposit, Taihang Mountain

CLC Number:

P618.51

Peijiao JU. Tectono-Geochemical Characteristics of Liyuan Gold Mine in the North Section of Taihang Mountain[J].Gold Science and Technology, 2021, 29(1): 64-73.

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元素	最大值	最小值	样品数	离差倍数	均值	标准离差	计算异常下限	实际异常下限	实际样品数
Cu	632.30	3.70	677	2	11.10	5.99	27.17	27	574
Pb	1853.5	5.10	677	2	26.84	7.38	41.46	41	665
Ni	204.10	2.80	677	2	6.53	3.10	12.70	13	507
Mn	3417	20	677	2	156.18	122.82	344.10	344	552
Ag	20	0.02	677	2	0.07	0.02	0.11	0.1	603
Zn	652.3	6.2	677	2	36.61	23.00	84.02	84	627
Co	54.2	1.7	677	2	4.17	2.05	12.44	12	502
B	95.4	2.3	677	2	5.32	2.17	9.46	9.5	576
As	22.59	0.31	677	2	0.81	0.22	1.18	1.2	624
Sb	130.4	0.11	677	2	0.33	0.08	0.46	0.5	639
Bi	0.79	0.04	677	2	0.04	0.01	0.05	0.05	504
Hg	0.7	0.01	677	2	0.01	0.01	0.02	0.02	579
Au	21.66	0.09	677	2	0.63	0.34	1.10	1.1	657

相关系数	Cu	Pb	Ni	Mn	Ag	Zn	Co	B	As	Sb	Bi	Hg	Au
Cu	1	-	-	-	-	-	-	-	-	-	-	-	-
Pb	0.705	1	-	-	-	-	-	-	-	-	-	-	-
Ni	0.307	-0.059	1	-	-	-	-	-	-	-	-	-	-
Mn	0.425	0.179	0.589	1	-	-	-	-	-	-	-	-	-
Ag	0.743	0.981	0.001	0.236	1	-	-	-	-	-	-	-	-
Zn	0.575	0.334	0.470	0.770	0.388	1	-	-	-	-	-	-	-
Co	0.359	0.004	0.767	0.835	0.064	0.666	1	-	-	-	-	-	-
B	0.034	-0.003	0.187	0.154	0.045	0.149	0.165	1	-	-	-	-	-
As	0.439	0.486	-0.022	0.163	0.527	0.290	0.047	0.035	1	-	-	-	-
Sb	0.694	0.989	-0.013	0.227	0.975	0.372	0.055	0.021	0.466	1	-	-	-
Bi	0.233	-0.010	0.311	0.27	0.051	0.295	0.280	0.128	0.160	-0.010	1	-	-
Hg	0.161	0.222	0.034	0.137	0.221	0.163	0.102	0.078	0.117	0.227	0.002	1	-
Au	0.227	0.002	0.137	0.206	0.053	0.402	0.069	-0.006	0.218	0.007	0.401	0.012	1

元素	F1	F2	F3	F4	F5	F6	F7
Cu	0.828	0.532	0.451	0.007	0.105	0.257	0.406
Pb	0.974	0.171	0.203	-0.023	0.199	-0.040	0.486
Ni	0.071	0.801	0.196	0.199	-0.022	0.441	-0.112
Mn	0.322	0.915	0.461	0.173	0.109	0.194	0.147
Ag	0.982	0.237	0.260	0.026	0.194	0.023	0.524
Zn	0.491	0.832	0.703	0.170	0.133	0.182	0.278
Co	0.151	0.935	0.261	0.180	0.065	0.288	0.002
B	0.034	0.181	0.037	0.999	0.070	0.127	0.023
As	0.513	0.159	0.322	0.026	0.103	0.117	0.994
Sb	0.973	0.220	0.216	0.004	0.204	-0.043	0.464
Bi	0.077	0.336	0.405	0.131	-0.020	0.963	0.136
Hg	0.227	0.131	0.085	0.077	0.997	-0.020	0.119
Au	0.097	0.230	0.922	0.004	-0.001	0.337	0.213

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Tectono-Geochemical Characteristics of Liyuan Gold Mine in the North Section of Taihang Mountain

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