Geochemical Characteristics and Geological Significance of Stream Sediments in Changjiashan Region, Western Qinling Orogen

doi:10.19657/j.geoscience.1000-8527.2022.025

Abstract

Abstract:

The northern sub-belt of Western Qinling Orogen is endowed with abundant polymetallic resource. To delineate mineral exploration targets, a 1:25,000 stream sediment geological survey was carried out in the Changjiashan district. Statistical analysis was performed from 1,141 samples for Kernal Density Estimation elements (Au, Ag, As, Sb, Bi, Cu, Pb, Zn, W, and Mo). Element concentrations are higher than the national and regional average, indicating metallogenic potential in the area. Element combinations of the four factors were obtained based on factor analysis, i.e., F1(Bi-Cu-Zn), F2(Au-As-Sb), F3(Ag-Pb), and F4(W-Mo). We obtained thresholds of geochemical elements and factor scores, and geochemical mapping via Concentration-Area (C-A) fractal modeling and Kriging interpolation, respectively. Combined with regional ore-controlling factors and anomaly spatial distributions, three polymetallic anomaly areas, i.e., Hz1, Hz2, and Hz3, were delineated. Geochemical halos comprise the supra-ore halo, near-ore hole, and sub-ore halo from northwest to southeast. Distribution of stream sediment geochemical anomalies indicates that all mineralization was fault-controlled, and the area close to the NW-trending Lixian-Lüjing fault at Changjiashan represents a favorable prospecting target.

Key words: stream sediment survey, geochemical characteristic, kernel density estimation, factor analysis, fractal modeling, Western Qinling Orogen

CLC Number:

P597
P618.5

WANG Bin, REN Tao, SONG Yiwei, YANG Ke, WANG Zhanbin, SUN Yake. Geochemical Characteristics and Geological Significance of Stream Sediments in Changjiashan Region, Western Qinling Orogen[J]. Geoscience, 2022, 36(03): 911-922.

Figures/Tables 10

Fig.1 Geological sketch map of Western Qinling Orogen

Fig.2 Geological map of the Changjiashan region (from Xi’an Center of Mineral Resources Survey, 2014)

Fig.3 Kernel density estimation diagrams of elements for stream sediment samples from the Changjiashan region

Table 1 Factor loading of R-type factor analysis with orthogonal rotation in the Changjiashan region

元素	F1	F2	F3	F4
Au	0.088	0.498	-0.401	0.286
Ag	0.107	0.114	0.774	0.106
As	0.062	0.747	0.256	-0.033
Sb	0.055	0.750	0.166	-0.037
Bi	0.792	0.039	0.039	-0.017
Cu	0.677	0.192	-0.033	0.269
Pb	0.114	0.220	0.706	-0.015
Zn	0.630	-0.023	0.211	-0.105
W	0.110	0.064	-0.020	0.738
Mo	-0.072	-0.066	0.076	0.788
特征值	2.146	1.400	1.189	1.030
方差贡献率/%	21.460	13.996	11.889	10.296
累计贡献率/%	21.460	35.456	47.345	57.641

Fig.4 Map of dominant factor of samples from the Changjiashan region

Fig.5 Double logarithm diagrams of C-A fractal model for different elements and factors of stream sediment samples from the Changjiashan region

Table 2 C-A fractal characteristics of the multi-element and factors for stream sediment samples from the Changjiashan region

元素	低异常值拐点	高异常值拐点
Au	1.56	2.22
Ag	0.085	0.172
As	30.31	65.78
Sb	5.19	8.08
Bi	0.35	0.43
Cu	21.1	26.0
Pb	26.1	47.6
Zn	88.9	479.3
W	2.90	4.27
Mo	0.90	1.23
F1	2.35	2.58
F2	1.58	3.91
F3	1.62	2.01
F4	1.46	3.39

Fig.6 Spatial distribution maps of geochemical and anomaly delineation for different elements and factors of stream sediment samples from the Changjiashan region

Fig.7 Ideal primary halo model for the Changjiashan region

Fig.8 Lithogeochemistry sections of P1 (a) and P2 (b) in the Changjiashan region

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