四川岔河地区水系沉积物地球化学特征及找矿方向

doi:10.11720/wtyht.2021.1417

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Abstract

The Chahe deposit is the largest tin deposit in Sichuan Province. In order to gain a prospecting breakthrough, the authors conducted 1:50 000 stream sediment survey, studied the characteristics of element combination of this area by feature analysis and factor analysis of the measuring results. The results show that the three main ore-forming element groups of Ag-Pb-Zn, Bi-F-W-Sn and Cu-Ni have similar enrichment rules, in which the enrichment regularities of W, Sn and other medium and high temperature elements are extremely significant, and the overlapping features of the spatial distribution of the element anomalies are good.The lower limit values were determined by methods of cumulative frequency and iteration. The authors compiled the element anomaly maps and delineated nine comprehensive anomalies. By comprehensive evaluation of the anomalies, the authors consider that the Chahe and Fangjia composite anomalies are the prospective areas. The authors analyzed the geological condition for mineralization, carried out mineral inspection, and discovered a new skarn type tungsten-tin vein in the Chahe prospective area and more than ten new quartz-vein type tungsten veins in the Fangjia prospective area. The Fangjia prospective area, with a certain degree of similarity in geological characteristics with the "five-story+basement" prospecting model for tungsten deposits, has a favorite prospect in the search for polymetallic deposits such as tungsten, copper, lead and molybdenum.

Key words： Chahe area stream sediment survey W-Sn deposit geochemical characteristics

Received: 22 August 2020 Published: 27 July 2021

ZTFLH:

P632

Corresponding Authors: HAO Xue-Feng E-mail: 125630276@qq.com;87483931@qq.com

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	Articles by authors
	Yun-Feng XU
	Xue-Feng HAO
	Yu-Long QIN
	Xian-Feng WANG
	Chang-Li XIONG
	Ming-Ze LI
	Weng-Hui WU
	Han-Yu ZHAN

Cite this article:

Yun-Feng XU,Xue-Feng HAO,Yu-Long QIN, et al. Geochemical characteristics of stream sediments and prospecting direction in Chahe area of Sichuan Province[J]. Geophysical and Geochemical Exploration, 2021, 45(3): 624-638.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1417 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I3/624

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Tectonic map of the Chahe area,Sichuan Province(modified after [9])

11])
1—Quaternary; 2—Xiaoba formation; 3—Feitianshan formation; 4—Guangou formation; 5—Niugundang formation; 6—Xincun formation; 7—Yimen formation; 8—Baiguowan formation; 9—mount Emei basalt formation; 10—Hongshiya formation; 11—Erdaoshui formation; 12—Xiwangmiao formation; 13—Qiongzhusi formation; 14—Dengying formation; 15—Guanyinya formation; 16—Lieguliu formation; 17—Tianbaoshan formation; 18—Fengshanying formation; 19—Limahe formation; 20—Tangtang formation; 21—medium grain porphyritic biotite granite; 22—medium grain porphyritic granodiorite; 23—medium grain porphyritic monzogranite; 24—fine grain two mica granite; 25—fine grain porphyritic biotite granite; 26—gneissic granite; 27—granodiorite; 28—metamorphic gabbro; 29—diabase gabbro veins; 30—quartz veins; 31—geological boundaries; 32—measured and inferred sedimentary unconformity boundaries; 33—measured and inferred reverse faults; 34—measured and inferred normal faults; 35—strike-slip faults; 36—undefined faults
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Sketch map of geology and mineral resources of the Chahe area,Sichuan Province (modified after [11])
1—Quaternary; 2—Xiaoba formation; 3—Feitianshan formation; 4—Guangou formation; 5—Niugundang formation; 6—Xincun formation; 7—Yimen formation; 8—Baiguowan formation; 9—mount Emei basalt formation; 10—Hongshiya formation; 11—Erdaoshui formation; 12—Xiwangmiao formation; 13—Qiongzhusi formation; 14—Dengying formation; 15—Guanyinya formation; 16—Lieguliu formation; 17—Tianbaoshan formation; 18—Fengshanying formation; 19—Limahe formation; 20—Tangtang formation; 21—medium grain porphyritic biotite granite; 22—medium grain porphyritic granodiorite; 23—medium grain porphyritic monzogranite; 24—fine grain two mica granite; 25—fine grain porphyritic biotite granite; 26—gneissic granite; 27—granodiorite; 28—metamorphic gabbro; 29—diabase gabbro veins; 30—quartz veins; 31—geological boundaries; 32—measured and inferred sedimentary unconformity boundaries; 33—measured and inferred reverse faults; 34—measured and inferred normal faults; 35—strike-slip faults; 36—undefined faults

Characteristic parameters of element geochemistry after elimination

Values for lower limit and concentration zoning of stream sediment anomalies of major metallogenic elements

Characteristic parameters of factor analyses

Distribution of the composite anomalies of the major metallogenic elements and prospective areas
1—Au anomaly; 2—Ag anomaly; 3—Bi anomaly; 4—F anomaly; 5—Hg anomaly; 6—Cu anomaly; 7—Mo anomaly; 8—Ni anomaly; 9—Pb anomaly; 10—Zn anomaly; 11—Sb anomaly; 12—Sn anomaly; 13—W anomaly; 14—Tin orebody; 15—Pb-Zn orebody;16—comprehensive anomaly; 17—prospective area

12])
1—carbonate of Fengshanying formation; 2—hypabyssal crust-derived granite; 3—metamorphic diabase; 4—sarn; 5—tin orebody; 6—siderite body; 7—fluorite quartz vein; 8—zoning boundary of element combination
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Geological model for Chahe tin deposit (modified after [12])
1—carbonate of Fengshanying formation; 2—hypabyssal crust-derived granite; 3—metamorphic diabase; 4—sarn; 5—tin orebody; 6—siderite body; 7—fluorite quartz vein; 8—zoning boundary of element combination

Anomaly profile maps of Chahe prospective area
1—Quaternary; 2—first member of Yimen formation; 3—lower member of Baiguowan formation; 4—first member and second member of Dengying formation; 5—Guanyinya formation; 6—Fengshanying formation; 7—first member of Limahe formation; 8—medium grain porphyritic biotite granite; 9—medium grain porphyritic monzogranite; 10—fine grain porphyritic biotite granite; 11—metamorphic gabbro; 12—diabase gabbro veins; 13—quartz veins; 14—geological boundaries; 15—faults; 16—tungsten-tin ores

Pictures of cassiterite sulfide ore in Chahe mining area

Anomaly profile maps of Fangjia prospective area
1—Tangtang formation; 2—third member of Limahe formation; 3—second member of Limahe formation; 4—first member of Limahe formation; 5—Fengshanying formation; 6—gneissic granite; 7—fine grain two mica granite; 8—fine grain porphyritic biotite granite; 9—medium grain porphyritic monzogranite; 10—fine grain porphyritic biotite granite; 11—geological boundaries; 12—faults; 13—anticline; 14—syncline; 15—tungsten-tin ores

Pictures of tin ore in Fangjia mining area

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