云南待补镇—德泽镇一带地球化学特征及异常评价

doi:10.11720/wtyht.2020.1164

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Abstract

Located along the Au-Pb-Zn-Cu-Fe-P-barite-coal-coal bedgas metallogenic belt in Qujing-Shilin fold thrust zone, the Daibu Town-Deze Town area of Yunnan Province is an important phosphorus, lead and zinc ore concentration area in Southwest China. Based on stream sediment geochemical Survey at the scale of 1∶50 000 in the Daibu Town-Deze Town area, the authors made comparison and analysis of geochemical characteristics of different formations, with the purpose of confirming the enrichment and dilution regularity and assemblage characteristics of regional elements. The study focused on the Xiaomiga No. HS-23-A₁ geochemical anomaly of P-Pb-Zn-Mo and Tengziwa-Reshuicun No.HS-24-A₁ geochemical anomaly of Pb-Zn-Au, and found the following phenomena: the HS-23-A₁ anomaly is induced by the ore-hosting horizon of third member of Lower Cambrian Dengying Formation and Cambrian Qiongzhushi Formation;the HS-24-A₁ anomaly is caused by lead-zinc veinlet,whereasthe Au anomaly is due to the secondary enrichment in the weathering crust.The Xiaomiga No. HS-23-A₁ geochemical anomaly serves as a good prospecting target for deep orebodies.Two phosphorus orebodies were delineated, but the Tengziwa-Reshuicun No.HS-24-A₁ geochemical anomaly of Pb-Zn-Au is relatively not ideal.Finally, the authors summarized the prospecting indicators of phosphate and lead-zinc deposits. The results obtained by the authors lay a foundation for further prospecting work.

Key words： Yunnan Daibu-Deze Town geochemistry characteristics anomaly evaluation prospecting indicator

Received: 24 March 2019 Published: 22 April 2020

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	Articles by authors
	Cheng-Zhong HE
	Rui WU
	Jun GUO
	Zu-Jian ZOU
	Quan-Heng LI
	Yi-Qi MA

Cite this article:

Cheng-Zhong HE,Rui WU,Jun GUO, et al. Geochemical characteristics and anomaly evaluation in Daibu Town-Deze Town area, Yunnan Province[J]. Geophysical and Geochemical Exploration, 2020, 44(2): 235-244.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1164 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I2/235

4]; b—Geological map of study area
1—Quaternary; 2—Triassic; 3—Permian; 4—Carboniferous; 5—Devonian; 6—Cambrian; 7—Sinian to Cambrian; 8—Nanhuaan system; 9—Mesoproterozoic;10—Emeishan basalt;11—unconformities;12—conformities;13—faults
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Geotectonic location and geological map of study area
a—Geotectonic location of study area^[4]; b—Geological map of study area
1—Quaternary; 2—Triassic; 3—Permian; 4—Carboniferous; 5—Devonian; 6—Cambrian; 7—Sinian to Cambrian; 8—Nanhuaan system; 9—Mesoproterozoic;10—Emeishan basalt;11—unconformities;12—conformities;13—faults

元素	剔除特异值平均值(剩余样数)(X)	未剔除特异值平均值( $X ?$ )	中位数 (M)	标准离差(S)	变化系数(C_v)	最大值	最小值	地壳克拉克值	全国水系沉积物平均含量	云南水系沉积物平均含量	浓集克拉克值	相对全国富集系数	相对云南富集系数
Au	3.33(8717)	3.55	3.1	2.45	0.7	45	0.33	1.3	1.8	1.85	2.6	1.8	1.8
Ag	0.14(8057)	0.22	0.14	0.36	1.6	6.4	0.038	0.056	0.086	0.094	2.6	1.7	1.5
As	12.80(8221)	19.55	7.55	29.50	1.5	532	0.25	2.5	12	14.5	5.1	1.1	0.9
Bi	0.45(8782)	0.47	0.38	0.30	0.6	5.65	0.025	0.18	0.39	0.39	2.5	1.2	1.2
Hg	0.10(8314)	0.14	0.079	0.32	2.3	18.6	0.003	0.03	0.046	0.06	3.2	2.1	1.6
Ni	65.33(8734)	67.63	64	28.05	0.4	355	5.3	59	26	41.3	1.1	2.5	1.6
P	1507(8443)	2021	1539	3072	1.5	69558	128	436	615	720.19	3.5	2.5	2.1
Pb	34.80(8253)	59.35	31.10	181.89	3.1	9427	8.2	11	27	30.5	3.2	1.3	1.1
Sb	1.38(8078)	2.55	0.87	4.90	1.9	90	0.19	0.2	0.96	1.38	6.9	1.4	1.0
Ti	17805(8940)	17816	17273	10298	0.6	50876	278	4200	4065	6215	4.2	4.4	2.9
Zn	144.63(8620)	154.52	149	85.13	0.6	3085	7.5	72	71	86.2	2.0	2.0	1.7
Al₂O₃	17.69(8856)	17.64	17.61	3.98	0.2	32.83	0.68		12.8	14.3		1.4	1.2
TFe₂O₃	12.75(8942)	12.75	13.48	4.92	0.4	28.1	0.96		4.5			2.8
Cd	0.95(8345)	1.34	0.8	2.82	2.1	176	0.05	0.08	0.18	0.201	11.9	5.3	4.7
Co	39.10(8881)	39.68	36.4	20.52	0.5	204	1.28	27	12	19.5	1.4	3.3	2.0
Cu	141.51(8919)	142.62	127	94.82	0.7	1266	4.34	27	23	41.1	5.2	6.2	3.4
Mo	1.60(8458)	2.05	1.56	6.06	3.0	523	0.1	0.8	1	0.96	2.0	1.6	1.7
U	3.87(8381)	4.58	3.46	3.96	0.9	97.8	0.5	1.3	2.7	3.22	3.0	1.4	1.2
Ge	1.60(8702)	1.58	1.59	0.31	0.2	3.86	0.05	1.14			1.4

Elements characteristic values of stream sediment in the study area (n=8 943)

The spectrum map of element concentration and variation coefficient

Element geochemical maps of the study area
a—element geochemical map of Mercury; b—element geochemical map of Phosphorus; c—element geochemical map of Cobalt; d—element geochemical map of Lead

Elements cluster analysis diagram of study area

Anatomy of No. HS-23-A₁ geochemical anomalies
1—Triassic; 2—upper Permian series; 3—middle Permian series; 4—Carboniferous; 5—Devonian; 6—Cambrian; 7—Sinian-Cambrian Dengying formation; 8—Sinian; 9—basic intrusive rock; 10—Phosphorus-bearing layer; 11—ore occurrences of Lead-Zinc; 12—fault structure;13—prospecting target area

Parameters of No. HS-23-A₁ geochemical anomalies

Anatomy of No. HS-24-A₁ geochemical anomalies
1—diluvium of Quaternary; 2—third member upper Permian Emeishan basalt; 3—middle Permian upper Yangxin member; 4—middle Permian lower Yangxin member; 5—middle Permian Liangshan formation; 6—Carboniferous; 7—upper Devonian upper Zaige member; 8—upper Devonian lower Zaige member; 9—upper Devonian Haikou formation; 10—Cambrian; 11—Sinian-lower Cambrian Dengying formation;12—fault structure; 13—ore occurrences of Lead-Zinc;14—ore occurrences of Lead;15—prospecting target area

Parameters of No. HS-24-A₁ geochemical anomalies

The prospecting criteria of Phosphate, Lead-Zinc ore in the study area

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