云南个旧老厂矿田东部大比例尺构造地球化学特征及找矿预测

doi:10.11720/wtyht.2020.0003

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Abstract

In the past half a century, with the consumption of resources, the Laochang orefield has entered the rank of resource crisis. In order to alleviate the shortage of mineral resources in the Gejiu tin deposit and prolong the life of the mine, the authors, on the basis of 1∶10 000 tectonic geochemical survey in the study area, analyzed and summarized the geochemical characteristics of 12 elements, used correlation analysis to determine the correlation of elements, used content-area (C-A) fractal method to determine the anomaly threshold, delineated the abnormal range, and then divided the prospecting area.The results show that the 12 elements are highly dispersed, differentiated and enriched in different degrees, among which Pb, Sn, Cu, Bi, As and Cd are the main ore-forming elements in the eastern part of Laochang, Sn and Cu elements have good correlation with Ag, Sb, Zn, Pb, As and Bi elements, and are closely related to mineralization; five prospecting area were delineated, and tin-copper orebodies were found through engineering verification,which shows that the application of tectonic geochemical method in this area can effectively provide scientific basis for the prospecting work.

Key words： tectonic geochemistry C-A fractal prospecting area crisis mine Gejiu tin mine

Received: 31 December 2019 Published: 29 December 2020

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Corresponding Authors: CHEN Shou-Yu E-mail: huangdz@cug.edu.cn;sychen@cug.edu.cn

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	Da-Zheng HUANG
	Shou-Yu CHEN
	Jiang-Nan ZHAO
	Shuai-Ji WU
	Yu-Ce ZHANG

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Da-Zheng HUANG,Shou-Yu CHEN,Jiang-Nan ZHAO, et al. Large scale tectonic geochemical characteristics and prospecting prediction in eastern Laochang orefield, Gejiu, Yunnan Province[J]. Geophysical and Geochemical Exploration, 2020, 44(6): 1261-1275.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.0003 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I6/1261

25] modified)
1—Quaternary; 2—slate, sandstone, glutenite of the Huobachong formation; 3—sandstone, shale intercalated with tuff and basaltic lava of the Falang formation; 4—basaltic lava of the Falang formation ; 5—carbonate rock of the Gejiu formation ; 6—purple-red sandstone with green sandstone and marl of lower Triassic ; 7—Ailaoshan metamorphic belt; 8—gabbro; 9—nepheline syenite; 10—alkali-feldspar granite; 11—alkaline granite; 12—porphyritic biotite granite; 13—equigranular biotite granite; 14—fault; 15—syncline; 16—anticline
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Geotectonic location(a) and geological sketch(b) of mining area in Gejiu area, Yunnan province(according to Mao J W,et al ^[25] modified)
1—Quaternary; 2—slate, sandstone, glutenite of the Huobachong formation; 3—sandstone, shale intercalated with tuff and basaltic lava of the Falang formation; 4—basaltic lava of the Falang formation ; 5—carbonate rock of the Gejiu formation ; 6—purple-red sandstone with green sandstone and marl of lower Triassic ; 7—Ailaoshan metamorphic belt; 8—gabbro; 9—nepheline syenite; 10—alkali-feldspar granite; 11—alkaline granite; 12—porphyritic biotite granite; 13—equigranular biotite granite; 14—fault; 15—syncline; 16—anticline

Geological sketch and sampling location of the eastern part of the Laochang ore field in Gejiu
1—the third layer of the Malage section of the Gejiu formation,dolomite with lime dolomite; 2—the second layer of the Malage section of the Gejiu formation,interbedded dolomite and dolomitic limestone; 3—the first layer of the Malage section of the Gejiu formation,thick layered dolostone; 4—the sixth layer of the Kafang section of the Gejiu formation,interbedded limestone and lime dolomite; 5—the fifth layer of the Kafang section of the Gejiu formation,limestone with lime dolomite; 6—stratigraphic boundary; 7—fault; 8—faulted and shattered zone; 9—sampling location

Analytic technique and parameter of tectonic geochemical samples

The statistical characteristics of the content parameters of tectonic geochemical elements in the eastern area of Laochang ore field

The coefficient of variation of tectonic geochemical elements in the eastern area of Laochang ore field

Histogram of the logarithmic content distribution of tectonic geochemical elements in the eastern area of Laochang ore field

Correlation analysis of tectonic geochemical elements in the eastern part of Laochang ore field

Normal test characteristic values of tectonic geochemical elements in the eastern part of Laochang ore field

C-A double logarithmic scatter of different elements and piecewise fitting graph

C-A fractal statistical characteristics of elements

Statistics of abnormal lower bound of tectonic geochemical elements

Single element anomoly diagram of 1:10 000 tectonic geochemical survey in the eastern part of Laochang ore field

Fig.2
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Comprehensive anomaly distribution and prospecting prospect zoning in the eastern part of Laochang ore field
1—Ag element anomaly; 2—As element anomaly; 3—Bi element anomaly; 4—Cu element anomaly; 5—Pb element anomaly; 6—Sb element anomaly; 7—Sn element anomaly; 8—Zn element anomaly; 9—comprehensive anomaly area and number; 10—prospecting area and number; 11—drilling hole and number;other legends are the same as Fig.2

综合异常编号	面积 /km²	元素组合	异常特征
HS-01	0.52	Sb-Bi-Pb-Cu-Zn-As-Sn-Ag	出露地层为个旧组马拉格段二层(T₂g²₂)白云岩与含白云质灰岩互层、个旧组马拉格段一层(T₂g¹₂)厚层状白云岩,异常区内异常元素套合好,各元素三级浓度分带明显,异常区内断裂较为发育
HS-02	0.34	Sb-Cu-Sn-Pb-As-Zn-Ag	出露地层为个旧组马拉格段二层(T₂g²₂)白云岩与含白云质灰岩互层,异常区内断裂较为发育,Sb、Cu、Sn聚于核部,Pb、Zn、Ag、As异常分布于外围,Ag、As、Pb、Sb、Zn三级浓度分带明显,但异常面积较小
HS-03	0.34	Zn-Cu-As-Sn-Sb-Ag-Pb-Bi	出露地层为个旧组马拉格段三层(T₂g³₂)白云岩夹灰质白云岩、个旧组马拉格段二层(T₂g²₂)白云岩与含白云质灰岩互层,异常区内断裂构造发育,Ag、Pb、Sb、Zn三级浓度分带明显
HS-04	0.34	Pb-Zn-Sb-Ag-Sn-Cu-Bi-As	出露地层为个旧组马拉格段二层(T₂g²₂)白云岩与含白云质灰岩互层、个旧组马拉格段一层(T₂g¹₂)厚层状白云岩,异常区内断裂极为发育,元素套合较好,Sn、Cu、Sb出现三级浓度分带,但面积较小
HS-05	0.61	Zn-Sn-Ag-Bi- Sb-Cu-As-Pb	出露地层为个旧组马拉格段二层(T₂g²₂)白云岩与含白云质灰岩互层、个旧组马拉格段一层(T₂g¹₂)厚层状白云岩,元素套合较好,具有2个浓集中心,元素三级浓度分带明显
HS-06	0.94	Zn-Ag-Sn-Sb-Pb-Cu-Bi-As	岩性较为简单,出露地层为个旧组马拉格段三层(T₂g³₂)白云岩夹灰质白云岩,具有1个明显的浓集中心,异常套合较好,异常元素浓度高,异常面积较大,Ag、Pb、Sb、Sn三级浓度分带明显
HS-07	0.47	Sn-Ag-Sb-Zn-Pb-As-Bi-Cu	出露地层为个旧组马拉格段二层(T₂g²₂)白云岩与含白云质灰岩互层、个旧组马拉格段一层(T₂g¹₂)厚层状白云岩、个旧组卡房段六层(T₂g⁶₁)石灰岩与灰质白云岩互层,具有3个明显的浓集中心,异常套合较好,异常元素浓度较大,但异常面积较小

Comprehensive abnormal feature statistics

Photographs field and core in the eastern part of Laochang ore field
a—tectonic fracture zone breccia; b—limonitization; c—net-shaped and thin-shaped calcite veins; d—limonitization cataclastic rock; e—ore-bearing skarn; f—skarn sulfide ore; g—diopsideskarn; h—chlorite marble

Geological-geochemical information section in the eastern part of Laochang ore field

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