Identifying the source of gold geochemical anomalies in Jiaodong, eastern China: Tracking the occurrence of gold nanoparticles in a metallogenic system

Abstract

The gold particles induced geochemical anomaly shows good potential for the prospecting of gold deposits all around world. Most of the discovered gold resources are located at geochemical related anomaly area in Jiaodong, which are associated with Micro-to nanoscale particle matter. However, it has been known little about the relationship between the occurrence of gold nanoparticles and their geochemical anomaly in multimedia accommodating to the detailed process of gold mineralization system and geochemical exploration. Micro-to nanoscale gold as nanoparticles are related to the hydrothermal fluid flows and precipitation among elemental migration. This paper presents gold nanoparticles in ore, constructed the fundamental link to geochemical anomaly distribution maps of gold in drainage sediments, wall rocks, and ore, aimed to identify the source of primary and secondary geochemical anomalies according to careful observation at nanoscale gold and revealed the genesis of gold mineralization and their potential in Jiaodong. A potential model of migration pathway of gold nanoparticle was built to understand the process of massive gold accumulation and the further prospecting in the Jiaodong Peninsula.

Introduction

Nanoparticles in the ore-forming fluids control the gold mineralization of fault zones and form enormous portions of the geochemical anomalies (Cohen et al., 2010; Hough et al., 2011; Wang et al., 2020; Hastie et al., 2021), ranging from regional reconnaissance to in-situ mineral mapping. Thus, geochemical anomalies are considered to be major contributors to gold exploration. Regional mineralization of hydrothermal deposits involves the formation of large-scale geochemical anomalies (Wang et al., 2007), which can be divided into primary geochemical anomalies and secondary geochemical anomalies according to their genesis. Recognizing primary geochemical anomalies, so-called hydrothermal alteration primary halos (Mackenzie et al., 2007; Qiu et al., 2021), could increase targeted mineralized zones and the potential volume associated with regional fault zones. Primary halos of hydrothermal mineralization are produced during the geochemical process of mineralization (Carranza and Sadeghi, 2012), which is strictly controlled by structural deformation, fluid flow, and fluid-rock interactions (Li et al., 2016). Accordingly, large-scale hydrothermal alteration halos depend on the development and maintenance of an efficient porosity-permeability system during fluid-rock interactions, emphasizing the importance of the mineral-assemblage replacement reactions during ore formation accompanied by elemental gains and losses (Jonas et al., 2014). Primary halos are the usual indicators of shallow ore bodies, which can be used to detect deep ore bodies, especially for products from the same hydrothermal mineralization system (de Palomera et al., 2012). Field evidence based on numerous experimental observations have indicated that more than 80% of the discovered gold resources are in geochemical anomalies in the Jiaodong Peninsula (Li et al., 2019a), emphasizing the importance of tracking the sources and influencing factors of geochemical anomalies for gold exploration.

Geochemical anomalies pattern are dominantly associated with mineral particles assemblage and structural control of orebodies, which are obscured by overburden ranging in thickness from decameters to hectometers in the Jiaodong Peninsula. Low-density, regional-scale geochemical prospecting has shown that the anomalies have obviously led to vast elementary migration, including geochemical blocks and geochemical provinces (Wang et al., 2007; Wang et al., 2015). However, it has been difficult to establish the relationships between regional geochemical anomalies and potential mineral deposits using traditional analytical methods and data processing. Thus, method for enhancing and detecting the composition of geochemical anomalies haves been debated over the years (Wang et al., 2021). In terms of concealed ore deposits, the development of analytical methods has led to the selective geochemical extractions (Zhang et al., 2019; Lu et al., 2022), and the implementation of large-scale geochemical surveys that in terms of concealed ore deposits have been conducted all around the world, such as Betze-Post-Screamer, Svetlinskoe, Tykotlov, Vaigul (Palenik et al., 2004; Osovetsky, 2016). The Mobile Metal ions (MMI) in Australia (Mann et al., 1998) and leaching of mobile forms of metals in overburden (MOMEO) in China (Wang, 1998). The gold nanoparticles of ore rock have been reported in the Xincheng gold deposit in the Jiaodong Peninsula (Yang et al., 2016). Meanwhile, the detailed relationship between regional geochemical anomalies and metal nanoparticles of host rocks, especially Precambrian metamorphic rock, and Mesozoic magmatic rock in the Jiaodong Peninsula gold deposits, have rarely been described. Therefore, careful examination of the relationships between the metal nanoparticles and geochemical anomalies (Wang et al., 2017), it has become a promising method to reveal the nature of orebodies.

In this paper, we present the gold distribution characteristic of drainage sediment, geological rock, and gold-bearing pyrite by comparing the occurrence of gold nanoparticles in multimedia and their genetic relationships, which could be helpful for the further deep mining exploration.

Regional geological background

The Jiaodong Peninsula is currently recognized as one of the largest gold provinces in the far-field of Pacific plate subduction zone (Li et al., 2015; Deng and Wang, 2016; Groves and Santosh, 2016; Deng et al., 2020a; Yang et al., 2020), where the majority of gold resources were formed at 120 Ma among Mesozoic granitoids (Deng et al., 2020b), which are prominently controlled by regional-scale NE-to NNE-trending fault zones (Figure 1). These gold deposits have been traditionally classified as disseminated-/stockwork-type (Jiaojia-type) and auriferous quartz-vein-type (Linglong-type) deposits, which are both enveloped with significant alteration halos from centimeters to decameters in width (Li et al., 2015). Chinese geologists have classified all these gold deposits are assigned to a special deposit type, namely, the “Jiaodong type” (Yang et al., 2014a; Goldfarb and Santosh, 2014; Deng et al., 2015; Groves et al., 2020; Qiu et al., 2020; Goldfarb et al., 2021).

FIGURE 1

Yang et al., 2019; Li et al., 2020; Song et al., 2020).

Within these highly gold-mineralized terrane, the Precambrian metamorphic basement is dominated by Neoarchean to Neoproterozoic gneiss (Jahn et al., 2008), which occupys approximately half of the area. Neoarchean Jiaodong group metamorphic rocks and mafic granulites underwent regional deformation, with intrusion by Proterozoic mafic - ultramafic rocks and A-type granites (Wan et al., 2012). The Neoarchean Jiaodong group is mainly composed of biotite plagiogneiss, biotite granulite, amphibolite, and biotite-hornblende-plagioclase gneiss, etc. The subsequent Neoproterozoic Fenzishan group, Jinshan group, and Penglai group consist of a sequence of calc-silicate rocks, garnet-biotite schist, dolomitic marble, biotite-amphibole schist, and minor amphibolite.

The Paleozoic strata is absent from the region. Meanwhile, the Mesozoic Laiyang group, Qingshan group, and Wangshi group are mainly distributed in the Jiaolai basin (Figure 1). The Early Cretaceous Laiyang group consists of conglomerate, siltstone, gritstone and litharenite, which are unconformity contact relationships with the Neo-proterozoic Jinshan group (Yang et al., 2014a). The Qingshan group is a suite of volcanic rocks, consisting of rhyolite, tuff, basaltic andesite, dacite, etc (Zhang et al., 2008). The Wangshi group is dominated by glutenite with marlstone. The Cenozoic sediments are widely distributed, including sandy clay, silty clay, clay, sand and gravel.

There were three periods of large-scale Mesozoic magmatic activities from the late Jurassic to middle early Cretaceous (Yang et al., 2020), and these intrusions have been associated with gold mineralization in close spatial and temporal relationships (Figures 2, 3), which are widely exposed in the Jiaodong Pensinsula (Santosh and Pirajno, 2015; Deng et al., 2018; Song et al., 2020). The Late Jurassic Linglong granitoids mainly consist of biotite granite, monzogranite, quartz-diorite, and granodiorite. The Early Cretaceous Guojialing granitoids consist of porphyritic quartz monzonite, granodiorite, and monzogranite potassic feldspar. The Aishan granitoids mainly consist of monzonite and a small amount of granodiorite.

FIGURE 2

FIGURE 3

Yang et al., 2016) and gold cluster (I) (Palenik et al., 2004).

Geochemical anomalies of gold

The characteristics of geochemical anomalies reveal the complex geological processes during the Earth’s evolution (Cohen et al., 2010). The spatial distribution of Au throughout the study area is shown on the contoured geochemical maps. It can be observed that there are four different geochemical anomaly areas based on the statistical summaries for Au concentrations of China’s Geochemical Baselines (CGB, sampling rock), the 1: 200,000 regional geochemistry national reconnaissance (RGNR, sampling stream sediments), and leaching of mobile forms of metals in overburden (MOMEO, sampling soil), which in general, have identified many gold deposits in the Jiaodong Peninsula (Li et al., 2019a; Wang et al., 2020). Most of the discovered gold resources have been in geochemical anomaly areas the Jiaodong Peninsula, which are dominantly controlled by the NE-to NNE-striking structures in greenfield. Chi and Yan (2007) calculated the median value (1.32 ppb) and the arithmetic mean value (2.03 ppb) of gold in the national drainage sediments based on 44,422 geochemical data of RGNR in China. It is quite clear that the median and arithmetic mean values of the Jiaodong gold province are higher than those of national drainage sediments (Table 1).

The most noticeable Au distribution pattern shown on the maps of MOMEO and CGB samples are closely associated with the density of regional faults to some degree (Figures 4, 5). The trend of increasing Au concentrations coincides with the primary halos within the hydrothermal alteration zones in this regional gold metallogenic system. Thus, Au anomalous centers are exactly correlated with gold mineralization and the regional fault zones in the Jiaodong gold province (Figure 5).

FIGURE 4

FIGURE 5

Wang et al., 2020).

These distribution patterns are also related to geological bodies, including the Precambrian metamorphic basement, Late Jurassic Linglong granitoid, Latest Early Cretaceous Guojialing, and Aishan granitoid and Mesozoic strata, especially in the Archean Jiaodong Group metamorphic rocks (Yang et al., 2014b). However, the gold content of these CGB rocks is not strictly consistent with the geochemical anomaly patterns. Meanwhile, Low Au concentrations of drainage sediments are distributed in the Jiaolai basin, where the majority of geologic rocks belong to the comprised of Laiyang group (0.22–0.38 ppb) and the Qingshan group (0.13–0.88 ppb) containing comparatively low contents of Au. The Mesozoic intrusions especially for Late Jurassic Linglong granitoids (0.16–3.97 ppb) occur as the derived source of gold in the hydrothermal alteration zones in gold deposits, which are controlled by the lithospheric faults and regional EW-trending structure of metamorphic basement. The Jiaodong group has also been considered to be the original source of the Jiaodong gold deposit, which played an important role in the reconcentration of the Jiaodong Peninsula (Yang et al., 2016).

Sampling and methods

Eight ore samples were collected from three drilling holes in the study area (Figure 2), including two samples from ZK-1-9 (−596 m ∼ −1,193 m level), two samples from ZK3-15 (−639 ∼ −1,212 m level) and four samples from ZK3-27 (−964 ∼ −1,071 m level). An optical microscope and scanning electron microscope were used to count the number of gold particles in gold-bearing pyrite (Figure 3). The transmission electron microscopy was conducted at the Institute of Geology and Geophysics, Chinese Academy of Sciences (IGGCAS), for counting gold nanoparticles in multimedia.

The regional geochemical data of gold in rocks were collected and provided by the China Geochemical Baselines (CGB) project. The sampling methods of the CGB project are described in detail in Wang et al. (2013, 2015), and 110 samples of CGB rock were analyzed using the MapGIS 6.7 and Geochemical Studio 3.0 software (Figure 4).

Results

The gold enrichment can be divided into two types, one is the gold complex enrichment in ore rock (30%–90%) during the process of ore-forming fluid migration and the other is ultra-scale enrichment of nanogold or ultrafine particle accumulation in soil (56%–85%), sediments (79%–90%) and wall rock (27%–86%) (Table 2; Figure 3) (Wang et al., 2013). The geochemical mapping of gold shows that it has been distributed in a 164.3 km² geochemical anomaly area that, controls over 60% of the gold deposit in the Jiaodong Peninsula. The arithmetic mean values of RGNR, CGB rock, and soil (top and deep) are 6.64, 0.83, 7.17, and 4.23 ppb, (Table 1; Figure 4), respectively. As compared with the Clark value of Au (1.0 ppb), the geochemical anomalies of RGNR and CGB topsoil are similar; their enrichment coefficients are both close to 7. These areas are the main secondary concentration center, and the primary gold mineralization center of the Jiaodong Peninsula. There is no clear geochemical relationship between RGNR and CGB rocks. During gold mineralization of the Jiaodong gold deposit, visible gold clusters experienced an enrichment process from nano/micron-to macro-scale mineral concentrator, including geochemical variation from primary anomalies of gold complex in ore forming fluid to invisible gold enrichment in wall rock and surface sediments. The 3D model for nonpoint source of geochemical anomalies has been used to explain the enrichment process of macro- and nanoscale gold in the local environment by nanogold and gold nanoparticle through multimedia the Jiaodong Peninsula (Wang et al., 2020).

A comparison of the content changes of Au among regional CGB rocks, gold bearing pyrite and ore rock in the Jiaodong Peninsula shows that the geochemical anomaly patterns result from gold particles. The Au content (proportion of gold particles) in different types of media is a significant reference for tracking massive gold deposits in deep prospecting targets accumulated by regional tectonic events.

Discussion

The occurrence of gold in a metallogenic system

Systematic gold geochemical anomaly patterns of the Jiaodong Peninsula are related to substances recycled by various geological agents within the metallogenic system of the Jiaodong gold province (Carranza and Sadeghi, 2012). These patterns are induced by multimedia including gold bearing-pyrite of ore bodies, high background value of different geological rock and secondary dispersion of drainage sediments. Micro- and nanoscale particles of gold have been widely reported in several sampling media in a metallogenic system (Osovetsky, 2016; Yang et al., 2016; Wang et al., 2020). Wang et al. (2013) proved that the proportion of gold (<5 um) in the Dayingezhuang gold deposit was as high as 88% in ore, 86% in wall rock, 85% in soil, and 90% in sediments (Table 2). These occurrences of gold all play an important role in the ore-forming process and geochemical exploration.

According to three drilling holes (ZK-1-9, ZK3-15, and ZK3-27) from wall rock (monzogranite) to orebodies (pyrite-sericite-quartz alteration rock) in the deep (below 1,000 m), the Au content is as low as 0.08 ppm in the wall rock (Figure 2), which is quite close to the detection limit (0.01 ppm), and the wall rock mainly consists particles gold (<5 um) similar to the Dayingezhuang gold deposit (Table 2) (Wang et al., 2013). The ore bodies, as shown in Figure 2, prove that the Au content is high, especially in the footwall of the ore-controlling fault. However, the majority of visible gold occurs in the microfracture or healed fractures of pyrite in hydrothermal alteration rocks (pyrite-sericite-quartz alteration rock and sericite-quartz alteration rock) in the Jiaodong Peninsula (Figures 3A–E). Irregular native particle gold usually occurs as inclusions (Figure 3F), suggesting the mobilization or precipitation of gold nanoparticles within pyrite grains during the hydrothermal process in the gold metallogenic system. Additionally, pyrite is the main source of invisible gold in the multimedia (Figure 3G). The distribution of gold content in pyrite is extremely inhomogeneous. The minimum value of gold is 10 ppb in pyrite, which is close to the abnormal threshold of 10.7 ppb in drainage sediments. The gold background value (median) in pyrite is 33.9 times that of RGNR drainage sediments and 223 times that of CGB rocks (Table 1).

Micro-to nanoscale gold particle clusters in ore are not new to science (Figures 3H,I), and neither are the resultant nanoparticles in soil or sediment samples that form from the weathering of original ore bodies. With the development of nanotechnology (Hochella et al., 2019), in-situ testing techniques such as focused ion beam-scanning electron microscope (FIB-SEM), high resolution transmission electron microscopy (HTEM), and atom probe microscope (APT) (Fougerouse et al., 2016; Dubosq et al., 2018) have made it possible to determine the size, shape, and intrastructure of nanoparticles cluster in rocks, soils, and sediments over gold deposits (Figures 4, 5, 6A–C). The most obvious intra characteristics among nanoparticles observed in the samples of multimedia showed good uniformity with the different stages during the ore-forming process in the deposits. In addition, the elemental composition of nanoparticles is also an important indicator for different types of gold deposits.

FIGURE 6

The formation model of geochemical anomalies

The formation model of regional gold geochemical anomalies in the Jiaodong Peninsula has been built with comprehensive natural factors, superposing all the information related to large-scale gold mineralization, high value of Au content of different geological rocks, and secondary dispersion of drainage sediments (Li et al., 2019a). High background values of CGB rock are the initial source of ore-forming material source (Table 1; Figure 5).

The formation of large-scale regional Au geochemical anomalies in multimedium is a complicated process involving Au mobilization and migration from the different phases of the parent materials (Figures 6D–G). The different occurrences from micro-to nanoscale gold could be used for identifying the genesis of a geochemical anomaly (Palenik et al., 2004; Figure 6F). The gold enrichment of the Jiaodong Peninsula can be divided into two types: one type is the Au(HS)^2- complex enrichment in the process of ore-forming fluid migration and the other type is ultrastructural deformation enrichment of nanogold and gold-bearing nanoparticles in the solid phase (Figures 3H,I; Figure 6E) (Li et al., 2019b). The gold particles or aggregations experienced an enrichment process from nano-to macroscale mineral concentrator, including chemical-structural variation from a gold complex in ore-forming fluid to micro- and ultrastructure of gold nanoparticles in pyrite and ore rock (Wang et al., 1995; Wang et al., 1999; Fougerouse et al., 2016). Triangles and hexagons of gold particles direct indicators of a natural reduction in the precipitation mechanisms. It has been proposed that the mobile phase is the transport of nanogold through the pathway within a fault (Deng et al., 2018). Gold nanoparticles have been absorbed to clay minerals in the laboratory (Wang et al., 2013), which is preferred for transport within the fault zones in a natural environment. The nanoscale Au–Cu alloy has also been observed for vertical transport from the concealed ore body in the depth to surface soil from the Jinwozi gold deposit in the Xinjiang provinces (Wang and Ye, 2011). Transport of gold among fault zones includes various of mechanisms in the form of a solution or mobilized as nanoparticles with subhedral to anhedral crystal shapes (Figures 5, 6D–G). The utilization of clay and bacteria instead of gold nanoparticles in the soil could also be useful for gold exploration in other areas of the world (Hough et al., 2008; Noble et al., 2009; Osovetsky, 2016).

Therefore, micro-to nanoscale particle clusters are critical for geochemical exploration in samples of multimedia sample, as mentioned above, which could effectively define a target area for potential deep mining of metal resources.

Conclusion

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