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Ore Prospecting Model and Targets for the Dashuigou Tellurium Deposit, Sichuan Province, China

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Ore Prospecting Model and Targets for the Dashuigou Tellurium Deposit, Sichuan Province, China Acta Geochim (2018) 37(4):578–591 https://doi.org/10.1007/s11631-018-0271-x ORIGINAL ARTICLE Ore prospecting model and targets for the Dashuigou tellurium deposit, Sichuan Province, China 1 2 1 1 3 Quanjiang Zhang • Yingping Liu • Mingyou He • Jun Bai • Wei Xu • Cong Zhao1 Received: 13 October 2017 / Revised: 6 March 2018 / Accepted: 12 April 2018 / Published online: 18 April 2018 Ó Science Press, Institute of Geochemistry, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2018 Abstract The Dashuigou tellurium (Te) deposit in Shi- These five regions are within the Dashuigou dome anti- mian city, Sichuan Province is the only known independent cline, the exposed strata of which are controlled by tracing Te ore deposit in China. Samples were collected by the tensile shear fracture; the metallogenic geological 1/50,000 stream sediment survey and analyzed by induc- conditions and geochemical characteristics are the same as tively coupled plasma–mass spectrometry, X-ray fluores- those of the known Dashuigou Te deposit. Already, Te–Bi cence spectrometry, emission spectrometry, and atomic veins have been found in some of these areas. absorption spectroscopy. An ore prospecting model for the Dashuigou Te deposit was then established. In the Keywords 1/50,000 steam sediment survey Á Ore Dashuigou area, bismuth (Bi), Te, and gold (Au) concen- prospecting model and targets Á Dashuigou Te deposit Á trations in stream sediment samples displayed weak-posi- Sichuan Province tive anomalies, while silver (Ag) displayed a weak- negative anomaly. Bi, Te, Ag, and Au anomalies are regarded as indicators of Te deposits; the greater the ratio 1 Introduction of Te ? Bi/Au ? Ag, the larger the possibility of an independent tellurobismuthite deposit. The ratio calculated Tellurium (Te) is an extremely scarce element in the crust, from our samples is 7.288. Five locations were identified with a clarke value of 1–10 ng/g. Li (1985) estimated the for prospecting for Te minerals by this model, including abundance of Te in the continental crust at 16 ng/g. The the northern part of the Dashuigou Te deposit, Majiagou, content of Te is also at the ng/g level in soil and sediments Tizigou, southeastern Miaoping, and northern Baishuihe. (Belzile and Chen 2015). Despite its rarity, Te remains a research focus due to its economic value. Qin et al. (2017) studies of the distribution and chemical species of Te in Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11631-018-0271-x) contains supple- contaminated soil are of geochemical and environmental mentary material, which is available to authorized users. significance for better understanding the solubility, mobility, and bioavailability of Te in the surface environ- & Mingyou He ment. Mal et al. (2017) demonstrated the application of an [email protected] upflow anaerobic granular sludge bed reactor for continu- 1 College of Earth Sciences, Chengdu University of ous tellurite removal from tellurite-containing wastewater Technology, 610059, No. 1 Dongsan Road, Erxianqiao, coupled to elemental Te recovery. You et al. (2014) have Chenghua District, Chengdu City, Sichuan Province, China explored the effect of the paleoredox environment change 2 Sichuan Geological Survey, No. 25 North Renmin Road, on Te concentration and the enrichment mechanism of Te Jinniu District, 610081, Chengdu City, Sichuan Province, in cobalt (Co)-rich crusts. Other researchers have focused China on Te deposits such as the Dashuigou; the Te-bearing gold 3 Chengdu Center of Hydrogeology and Engineering Geology (Au) deposit in Shandong Province (China) (Hu et al. Sichuan Bureau of Geology and Mineral Exploration and Development, 2nd Section of North Yihuan Road 3, Jinniu 2016); the Te–Au deposits in Kalgoorlie (western Aus- District, 610081, Chengdu City, Sichuan Province, China tralia) (Shackleton et al. 2003), Paramashan (northeastern 123 Acta Geochim (2018) 37(4):578–591 579 Greece) (Voudouris et al. 2005), and Ecuador (Vikentyev et al. (2013) constructed a prospecting model for typical et al. 2005); and the Te–Pb deposit in Geordie Lake (On- Jiama copper (Cu)-polymetallic deposits, based on regional tario) (Mulja and Mitchell 1991). geologic features, geologic and geochemical characteristics Since the discovery of the Dashuigou Te deposit in of the deposit, geochemical anomalies, and important ore- Sichuan Province many geologists have examined its controlling conditions. Lang et al. (2017) established a geology, geochemistry, and isotopic characteristics (e.g. comprehensive information prospecting model with the Luo et al. 1994, Luo and Cao 1996; Mao et al. 1995a, b; aim of searching for Cu–Au ore deposits and expanding the Yin et al. 1996; Wei and Zhang 1999). Lead (Pb) and sulfur quantity of resources. To date there are no ore prospecting (S) isotopes provide an effective method for tracing the models to guide prospecting for Te deposits. source of materials (Zartman and Doe 1981, Zartman and In this paper, we analyzed the geology, structure, and Haines 1988; Gwiazda et al. 1996; Townley and Godwin geochemical characteristics of the area of the Dashuigou 2001; Chang and Zhu 2002; Baker et al. 2004; Shen et al. tellurobismuthite deposit, and summarized S and Pb iso- 2012; Cloquet et al. 2015; Ickert et al. 2015; White et al. topic compositions and prospecting indicators in order to 2016; Cook and Hoefs 1997; Field et al. 2005; Robert and establish an ore prospecting model that can be used to Seal 2006; Defouilloy et al. 2016; Tanner et al. 2016; guide prospecting of deposits similar to the Dashuigou Te Giulian et al. 2016). Wang et al. (1995, 2011b) studied the deposit in other regions. Pb isotopes of the Dashuigou Te deposit and found that 207Pb/204Pb–206Pb/204Pb projection points fell between the orogenic belt and the upper crustal evolution curves, while 208Pb/204Pb–206Pb/204Pb projection points fell between the 2 Geologic setting mantle and the lower crustal evolution curves, indicating that the Pb in these samples derived from both the crust and 2.1 Regional geology the mantle. In Wang et al.’s (1995) study of the Dashuigou Te deposit, the d34S values of pyrite, pyrrhotite, and tet- Dashuigou is located in the platform-trough junction zone radymite were 1.13% to 1.16%, - 0.38% to 2.36%, and of the Yangtze Platform, at the eastern edge of the Song- - 0.50% to 3.17%, respectively; Wang concluded the S pan–Ganzi geosyncline, and in the central sector of the was mainly derived from the deep Earth, likely in relation Longmen Mountain–Daxue Mountain–Jinping Mountain to magmatic activity or metamorphism. Although scientists nappe structure (Chen et al. 1994). have carried out extensive research on the Dashuigou, the The strata exposed are Sinian, Ordovician, Silurian, existence of other Te deposits similar to the Dashuigou is Devonian, Permian, and Triassic (Fig. 1). Magmatic undetermined. activity is relatively developed in the Jinningian, Hercy- Geochemical prospecting is widely used in mineral nian, and Indosinian–Yanshanian. Diabase is widely dis- exploration, resource prediction, and other applications tributed in the eastern region. Due to the influence of the (e.g. Qian et al. 2011; Zhou et al. 2013; Horiuchi et al. Indochina–Yanshan movement, NNE-, NS-, and NNW- 2014; Mokhtari et al. 2014; Spiridonov et al. 2014; Zhang trending faults and folds are widespread, and there are et al. 2017). Chabaux et al. (2017) deciphered the diversity many nappe structures. The strata have been subjected to of the water flow and the associated water–rock interac- varying degrees of metamorphism. tions in elementary mountainous catchments by combining geochemical tracing and geochemical modeling approa- 2.2 Geology of the Dashuigou Te deposit ches on surface and deep borehole waters. Gad and Saad (2017) applied a geochemical model to simulate net geo- The core strata of the Dashuigou dome anticline are the chemical mass-balance reactions between initial and final Ordovician Dahebian Formation (Fm) and the overlying waters along a hydrologic flow path. Other researchers Silurian Tonghua Group (St) (Fig. 2). St is divided into have compiled models of typical ore deposits to guide seven formations, from top to bottom: prospecting (e.g. Bai and Liu 1996; Li and Zeng 2007; Sun Seventh Fm (St7) variegated mudstone and dolomite 2008; Xu et al. 2008; Shi et al. 2011; Ren et al. 2014; Wen structure with lagoon facies. The upper part is composed of and Teng 2014). Wang et al. (2009) established a gray or grayish-green chlorite-albite schist and muscovite- prospecting model for Pb-zinc (Zn) ore based on geological dolomite schist interbedded with dolomite; the lower part is background of the metallogenic belt, basic characteristics composed of gray sericite-chlorite-quartz phyllite. of Pb–Zn deposits, and the conditions controlling Pb–Zn Sixth Fm (St6) carbonate structure with open-platform ore. Wu et al. (2011) established the metallogenic model of facies. It is composed of gray or dark gray thin-thick block molybdenum (Mo) deposits on the basis of deposit geol- fine crystalline limestone with two-mica schist and albite- ogy, geochemistry, and isotope geochronology data. Gong dolomite schist. 123 580 Acta Geochim (2018) 37(4):578–591 Fig. 1 Regional geology of the N Dashuigou Te deposit T Triassic P Permian Z D Devonian Silurian St D Tonghua Gp Ordovician Od P Dahebian Fm P Z Sinian Indosinian-Yanshanian Intrusive rock Hercynian D Intrusive rock Jinningian Intrusive rock T D Diabase (vain) St Geological boundary Z Fault Dashuigou Tellurium Deposit Od D P Z 0 2Km Fig. 2 Geological sketch of the N Z Dashuigou region D 4-5 Q Quaternary St PM2 T Triassic PD2 P Permian D P Majiagou D Devonian St3 4-5 St 1-7 Silurian St 2 Tonghua Gp St Ordovician 2 Od St Dahebian Fm T St3 Od Z Sinian St1 St4-7 St1 βμ Diabase(vein) Tizigou Baishuihe PMFine diabase βμ 2 Fine granied Q Miaopin PD 2 olivine Geological boundary P Fault Dashuigou Te deposit D Z 0 1Km 123 Acta Geochim (2018) 37(4):578–591 581 Fifth Fm (St5) gray sandy shale structure with shelf during the Yanshan Orogeny.
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