(PDF) GEOCHEMICAL EXPLORATION; CASE …

2015-5-8 · CASE STUDY OF GOLD MINERALIZATION IN ILESHA NIGERIA . AGY 410, APPLIED GEOLOGY SEMINAR . ... geochemistry, as originally defi ned by Goldschmidt and summarized by Mason (1952, p. 2), is.

Introduction to Geology and Resources of Gold, and …

2010-9-19 · Geochemistry of gold in hydrothermal deposits Abstract A9 Introduction A9 Nature and source of solutions A9 Sources for gold A12 Mechanisms of gold transport and deposition A15 References cited A22 FIGURES Al. Chart showing gold production, United States consumer price index, and price of gold, 1845-1987 A4 A2.

Conditions and processes leading to large-scale gold …

2021-7-15 · The gold deposits in the Jiaodong Peninsula constitute the largest gold mineralized province in China. The mineralization shows common characteristics in their tectonic setting, ore-forming fluid and metallogenic system. Sulfidation and fluid immiscibility are two important mechanisms controlling gold precipitation, both of which consume sulfur in the ore-forming …

Geochemistry, Alteration and Genesis of Granodiorite …

ABSTRACT This manuscript presents geochemistry, alteration and genesis of granodiorite hosted gold mineralization in Okote area, Guji zone, of southern Ethiopia. A primary juvenile porphyry type metagranodiorite hosted gold deposition is latter

Structural geometry of orogenic gold deposits: …

2018-2-1 · Timing of gold mineralization in the Kalgoorlie Gold Field and its host Kalgoorlie Terrane, Yilgarn Block, Western A ustralia (after Vielreicher …

Geologic structures associated with gold mineralization in …

Gold in this area is alluvial, mined by artisanal miners and detailed information regarding the structures controlling primary mineralization remains sparse. Structural interpretations are afforded by in-depth investigation of airborne magnetic and radiometric data, which are then supported by ground geological mapping and by microscopic ...

Regolith geochemistry and EPR : characterization of gold …

Thick, commonly lateritic regoliths are widespread in inter-tropical regions of the world, and present a challenges to current exploration techniques. The particular problem in Australian is the widespread deep and varied regolith, frequently with a complex geological history dating back to mid-Permian time. Within this long period, several episodes of deep weathering and selective …

Geochemistry of hydrothermal gold deposits: A review

2011-7-1 · Mineral assemblages formed during hydrothermal alteration reflect the geochemical composition of ore-forming fluids. Gold is mainly transported in solution as Au–Cl and Au–S complexes. The change of physicochemical conditions such as temperature, pressure, oxygen fugacity, and sulfur fugacity are effective mechanisms for gold precipitation.

(PDF) Gold Mineralization

The Sukari gold mine (18.8Mt @ 2.14g/t Au) is located 15km west of the Red Sea coast in the southern central Eastern Desert of Egypt. The vein-type deposit is …

Geology, structure and geochemistry of gold …

Gold mineralization in the Beardmore-Geraldton area occurs in a major, long-lived deformation zone, spatially coincident with the boundary between the Wabigoon subprovince to the north and the Quetico subprovince to the south. -- Regionally, the deposits are linearly distributed (east-west) parallel to the strata of the southern margin of the Wabigoon belt.

Geochemistry and mineralogy of banded iron-formation …

Arsenopyrite geothermometry yielded metamorphic recrystallization temperatures of 380 degrees to 500 degrees C for the ores.Two types of gold mineralization are distinguished in the studied area: (1) stratiform mineralization constituting a mixed carbonate-sulfide facies type of banded iron-formation, and (2) discordant vein-type mineralization.

Woakes, M., & Bafor, B. E. (1984). Primary Gold …

Primary Gold Mineralization in Nigeria. In R. P. Foster (Ed.), GOLD'' 82 The Geology Geochemistry and Genesis of Gold Deposits (pp. 661-671). Rotterdam A. A. Balkema. Login. Login ... Geology of the Structurally Controlled Quartz Vein Gold Mineralization in the Dikko Area, Part of Zungeru—Minna—Birnin Gwari Schist Belt, NW Nigeria.

Trace Elements Geochemistry of In Situ Regolith Materials …

2021-7-12 · The central Dodoma region of Tanzania is one of the regions defined by the Tanzania Craton (TC). Although the Craton gold mineralization has been well explored and hosts most of the gold deposits in the country, the understanding of the mineralization potential of the Dodoma region is still an enigma. This study using trace elements geochemistry of soil samples aims …

GEOCHEMICAL MODELING OF ALTERATION AND GOLD …

2000-3-22 · associated with the main stage of gold mineralization contained high density CO 2 (0.86 to 0.78 gm/cm 3) and was of moderate to low salinity (10 wt. percent NaCl equivalent). The trapping pressures of the fluid inclusions were 1,000 to 1,425 bars. This mineralization stage took place at minimum temperatures from 210 ° to 200° C.

Geology, geochemistry, and genesis of orogenic …

2014-4-1 · The Shalagang antimony deposit was suggested to have formed from meteoric fluid driven by intrusive bodies and overprinted the early Sedex-type mineralization (Li et al., 2002). The gold, gold–antimony, and antimony deposits were suggested to be related to Yanshanian and Himalayan alkaline basic and intermediate intrusive dikes (Nie et al ...

Journal of Geochemical Exploration

2013-11-25 · Genesis of altered slate type ores in the Huangjindong gold deposit, Jiangnan Orogenic Belt, South China. Ke Xu, Deru Xu and 8 more. Geology, geochemistry, and genesis of REY minerals of the late Cretaceous karst bauxite deposits, Zagros Simply Folded Belt, SW Iran: Constraints on the ore-forming process. Farhad Ahmadnejad, Giovanni Mongelli

Archaean lode gold deposits | SpringerLink

Lode gold deposits are one of the most characteristic features of Archaean greenstone belts within granitoid-greenstone terranes, with major deposits situated in most major cratonic areas (e.g. Australia, Brazil, Canada, India, South Africa, Zimbabwe: Foster, 1984; Macdonald, 1986; Ho and Groves, 1987). Even relatively small cratons typically ...

Texture and geochemistry of pyrite from the Jinya, …

2022-4-20 · Isotope mixing during gold mineralization or post-ore modification at the nanoscale has been proposed to explain the fluctuation of Pb isotope ratios (Fougerouse et al. 2019); however, the verification of this at Jinya, Nakuang, and Gaolong requires further research. Considering the evolution of the S and Pb isotope compositions of the sulfides ...

Geology, Geochemistry and Geochronology of the Gold …

The Neoproterozoic (900-600 Ma) Arabian Nubian Shield is an example of Precambrian plate tectonics and arc accretion. The Western Ethiopian Shield (the southern extension of ANS) is geo-tectonically a characteristic of lower grades of

Geological controls on gold mineralization in the

2017-8-30 · deposits and controls on gold mineralization, geita greenstone belt, tanzania . 3.1. summary . 3.2. introduction: greenstone belt and gold mineralization . 3.3. previous structural work . 3.4. rock types and stratigraphy of the kukuluma terrain . 3.4.1. volcano-sedimentary units . 3.5. the history of deformation and intrusion in the central ...

Contrasting geochemistry of orogenic gold deposits in …

2015-2-27 · Both belts host orogenic gold deposits of mainly Jurassic to Early Cretaceous age. Jurassic mineralization in the YTT occurred during convergent orogenesis and stacking of previously-metamorphosed (Palaeozoic) greenschist-amphibolite facies metasediments, metavolcanic rocks, and metagranitoids.

Gold Deposits and Their Geological Classification

2016-11-20 · A rational geological classification of the commonly recognized lode gold deposits is feasible if it is based on the geological settings of the deposits, host rocks, nature of mineralization and geoche m-ical signature. Sixteen common types of bedrock gold deposits are distinguished from one another and their main geological attributes are ...

An investigation of the geology, geochemistry and timing …

Silurian-Devonian orogenic gold deposits in Newfoundland are typically situated proximal to major regional scale structural lineaments. Such deposits are formed in accretionary settings, late in the orogenic process with nearby intrusions of similar age, by low-salinity, H₂O-CO₂ ± CH₄ fluids at temperatures ranging from 250-350°C. The White Bay area of western Newfoundland contains …

GEOLOGY AND GEOCHEMISTRY OF UNUSUAL GOLD …

2019-9-27 · some of the first gold prospects discovered in Newfound-land, including the first commercial gold mining operation (ca. 1904) at the Browning Mine, south of Sop''s Arm (Fig-ure 1). The Silurian rocks of the Sops Arm Group contain most of the gold mineralization known prior to the 1980s, and most of these localities were initially described by ...

Gold grade variation and stream sediment geochemistry …

2014-6-19 · Stream sediment geochemistry remains a versatile tool in exploration especially in regions where knowledge of the primary mineralization is lacking and the exploration activities are still at reconnaissance stage. In this study, we investigate the concentrations of gold and associated elements in stream sediment samples from the Vaimba-Lidi drainage system in …

Regional variation in gold mineralization in the vicinity of …

2022-6-7 · The alluvial gold at Glengaber Burn in the valley of the Megget Water is of interest because of its coarse size and historical working. A total of 350 alluvial gold grains from 17 sites in Glengaber Burn and the vicinity have been studied using the technique of microchemical characterization, and two major types of gold have been identified, each with well defined …

(PDF) GEOLOGICAL AND GEOCHEMICAL …

2019-9-25 · GEOLOGICAL MAPPING. The first work in miner al exploration is the preparation of a high-quality geological. map. The pr ecision and scale of map depends on the stages of exploration, technical ...

(PDF) Geology, geochemistry, and genesis of …

2014-4-1 · PDF | On Apr 1, 2014, Wei Zhai and others published Geology, geochemistry, and genesis of orogenic gold–antimony mineralization in the Himalayan Orogen, South Tibet, China | Find, read and cite ...

Gold mineralization in China: Metallogenic provinces, …

2016-8-1 · 1. Introduction. With the discovery of many large and super large gold deposits in China during the last 30 years, the country''s annual gold production has increased significantly from approximately 25 t in 1980 to 180 t in 1999 and to 340 t in 2010, to become one of the biggest gold producers in the world inese geologists have carried out extensive research on …

Major and trace element geochemistry of tourmalines

2017-12-1 · The gold mineralization is structurally controlled and is present in second- and third-order structures of major shear zones (Kojonen et al., 1993, Nurmi et al., 1993). Gold mineralization has been found in essentially all major lithologies of the HSB, including epiclastic sedimentary and volcanogenic rocks and intrusive rocks (Nurmi et al., 1993).

The geologic setting, mineralogy, geochemistry, and …

The gold content of the veins is generally > 10 ppm. The veins are also unusually enriched in Cr and Ni. These observations and the fluid inclusion studies on vein quartz (Santosh, 1986) suggest the presence of CO 2-bearing ore fluids.One sample of the ore vein has a strongly fractionated, light REE-enriched pattern with an epsilon Nd 18 O of ...

Alteration and mineralization styles of the orogenic …

Orogenic disseminated and Carlin gold deposits share much similarity in alteration and mineralization. The disseminated orogenic Zhenyuan Au deposit along the Ailaoshan shear zone, southeastern Tibet, was selected to clarify their difference. The alteration and mineralization from the different lithologies, including meta-quartz sandstone, carbonaceous slate, meta …

Alteration Associated with Gold Deposition at the Getchell …

2001-9-1 · Alteration Associated with Gold Deposition at the Getchell Carlin-Type Gold Deposit, North-Central Nevada ... 10 oxides, and loss on ignition, using multiple techniques. Petrographic studies were integrated with geochemistry and X-ray diffraction and electron microbeam analyses to identify ore and alteration minerals and to correlate mineralogy ...

Fluid Inclusions and Stable Isotope Geochemistry of Gold …

2022-7-15 · The Xiawolong gold deposit, located in the Muping–Rushan gold metallogenic belt (eastern Jiaodong Peninsula), is a newly discovered deposit that developed in the late Early Cretaceous as fine-grained granite. Gold mineralization, which mainly occurs in the middle of fresh fine-grained granite dikes, consists of stockwork-style and disseminated ores. They are …

Geochemistry

Editor-in-Chief. GEOCHEMISTRY was founded as Chemie der Erde 1914 in Jena, and, hence, is one of the oldest journals for geochemistry-related topics. GEOCHEMISTRY (formerly Chemie der Erde / Geochemistry) publishes original research papers, short communications, reviews of selected topics, and high-class invited review articles addressed at ...

Relationship Between Orogenic Gold Mineralization and …

2018-6-7 · 2.2 Deposit Geology. The Zhenyuan gold deposit is composed of the Laowangzhai and Donggualin districts (Figure 2a; Deng et al., 2015).Ore bodies are contained within NW to NNW-trending and NE to ENE-trending joints and faults (Figure 2a; Deng et al., 2015).Mineralized rocks include Lower Carboniferous and Upper Devonian siliceous slate, meta-quartz …

The geology and geochemistry of Jinchangyu gold …

2016-3-1 · Red quartz–albite veins host the Jinchangyu Au deposit in an Archean greenstone belt, which consists of the Qianxi–Zunhua Groups. Previous studies have been focused on the geology, ore-controlling structures, geochemistry, mineralogy, and geochronology (Lin et al., 1994, Niu et al., 2012, Song et al., 2011, Yu and Jia, 1989, Zhang et al., 1991), but the timing …

Geochemistry, alteration, and genesis of gold …

Geochemistry of gold mineralization at Okote, Ethiopia 309 pyrite and ore stage carbonate, fluid inclusion data of auriferous veins, and to discuss the possible genesis of the gold mineralization. REGIONAL GEOLOGY AND METALLOGENY The geological investigations in east and northeast Africa and Arabia show that zones low-grade metamor-

Fluid Inclusions and Stable Isotope Geochemistry of …

Fluid Inclusions and Stable Isotope Geochemistry of Gold Mineralization Associated with Fine-Grained Granite: A Case Study of the Xiawolong Gold Deposit, Jiaodong Peninsula, China