Fault geometry and fluid-rock reaction: Combined controls on mineralization in the Xinli gold deposit, Jiaodong Peninsula, China

Yang, Lin; Zhao, Rui; Wang, Qingfei; Liu, Xuefei; Carranza, Emmanuel John M.

doi:10.1016/j.jsg.2018.03.009

Cited by 55 publications

(18 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many studies have demonstrated that structure-fluid feedback produces and/or destroys permeability by mineral dissolution and/or precipitation with mass and volume changes (Fig. 9; Cox, 1995;Sibson, 1996;Sausse et al, 2001;Kolb et al, 2004;Blenkinsop and Kadzviti, 2006;Yang et al, 2018b). Previous studies showed that the fault bends, as detected from changes in dip directions and angles of a fault plane, in the Xinli gold deposit controlled large-volume fluid flow and the fluids reacted with the granite to produce sericite alteration with an 8%-57% decrease in molar volume (Fig.…”

Section: Structure-fluid Feedback Triggering Gold Depositionmentioning

confidence: 99%

“…Gold mineralization in Jiaodong can commonly be divided into four ore stages: (1) pyrite-rubeficationsericite-quartz; (2) quartz-pyrite; (3) quartz-polymetallic sulfide; (4) and quartz-calcite (Yang et al, 2016a(Yang et al, , 2018bDeng et al, 2020c). Taking the Xinli gold deposit as an example, the quartz-pyrite pods have not preferred orientation, and quartz-polymetallic sulfide vein orient NE-to EW-trending, whereas the quartz-calcite veins trend NE-SW (Fig.…”

Section: Structural Control On the Zonation Of Alteration And Mineral...mentioning

confidence: 99%

See 1 more Smart Citation

The Formation of the Jiaodong Gold Province

Deng

WANG

LIU

et al. 2022

Acta Geologica Sinica (Eng)

Self Cite

View full text Add to dashboard Cite

Gold deposits in Jiaodong, termed Jiaodong‐type, are tectonically located in the southeastern margin of the North China Craton. Their major features are reviewed in this paper to highlight the differences between Jiaodong deposits and other genetic types of gold deposits. The mineralization was synchronized with asthenosphere upwelling indicated by syn‐ore OIB‐like mafic dike and large‐scale crustal thinning suggested by decrease of Sr/Y from pre‐ore to syn‐ore granites. Asthenosphere upwelling induced by the roll‐back of Paleo‐Pacific Plate drove partial melting of lithospheric mantle and devolatilization, which induced the release of the ore‐forming fluids. In concomitant with magmatic records, mineralization migrated from the western Jiaobei terrane (133–127 Ma) to the eastern Sulu orogenic belt (114–108 Ma), corresponding to the eastward roll‐back of Paleo‐Pacific Plate. Gold mineralization in Jiaodong formed in the transitions of ductile to brittle deformation, rapid to slow crustal uplift, and regional compression to extension. In the regional‐scale, the gold deposits in the Jiaobei terrane are mostly situated at intersections between NE‐trending faults and EW‐trending basement faults, and gold orebodies dominantly controlled by the lithologic contacts between Precambrian metamorphic rocks and Mesozoic granites. The mineralization was dominated by the disseminated‐veinlet ores related to quartz–sericite alteration in strong cataclasite‐breccia zone, with subsidiary thick quartz‐sulfide veins developed in secondary fault zones. The ore‐forming fluids belong to a H2O–CO2–NaCl±CH4 system and show minor variations in salinity among different types of ore. Structure‐fluid feedback involving fluid‐rock reaction and hydrofracturing triggered the fluid phase separation and resultant gold deposition. The Jiaodong gold deposits are distinct from orogenic and intrusion‐related gold deposits in terms of tectonic setting, origin of ore‐forming fluids, and mechanism of gold deposition.

show abstract

Section: Structure-fluid Feedback Triggering Gold Depositionmentioning

confidence: 99%

Section: Structural Control On the Zonation Of Alteration And Mineral...mentioning

confidence: 99%

The Formation of the Jiaodong Gold Province

Deng

WANG

LIU

et al. 2022

Acta Geologica Sinica (Eng)

Self Cite

View full text Add to dashboard Cite

show abstract

“…Interestingly, these are locations where the main orebodies are comprised of quartz vein-type ores, suggesting at least a rough spatial or genetic correlation between vein-type orebodies and normal-strike slip extension deformation. The fragmentized contact zone ascribed to the overprinting structural deformation on the early altered zone may be the pathway and dilation space for hydrothermal fluid transmission [3,75,76]. In addition, the altered rocks near permeable channels commonly have different mechanical properties from nearby wall rocks, thereby showing distinct deformation during fault propagation, as discussed above.…”

Section: Insights From 3d Models and Spatial Analysismentioning

confidence: 95%

“…time gap between phyllic alteration and auriferous quartz veins preclude the coeval formation in one hydrothermal event [33,35,37,39]. Previous studies have proposed that the interactions between hydrothermal fluids and rocks could enhance the rock permeability by mass and volume changes linked to mineral dissolution and precipitation, and further control or facilitate the brecciation and formation of new fractures [73][74][75][76]. Since the fault F 2 underwent at least three-phases of deformation during strike-slip movement during ore-forming processes [41], the occurrence of quartz veins was mostly likely promoted by late structural deformation on the earlier altered rock.…”

Section: Insights From 3d Models and Spatial Analysismentioning

confidence: 99%

3D Mineral Prospectivity Modeling for the Low-Sulfidation Epithermal Gold Deposit: A Case Study of the Axi Gold Deposit, Western Tianshan, NW China

et al. 2020

View full text Add to dashboard Cite

The Axi low-sulfidation (LS) epithermal deposit in northwestern China is the result of geological controls on hydrothermal fluid flow through strike-slip faults. Such controls occur commonly in LS epithermal deposits worldwide, but unfortunately, these have not been quantitatively analyzed to determine their spatial relationships with gold distribution and further guide mineral prospecting. In this study, we conduct a 3D mineral prospectivity modeling approach for the Axi deposit involving 3D geological modeling, 3D spatial analysis, and prospectivity modeling. The spatial analysis of geometric features revealed the gold mineralization trends in convex segments (0–20 m) with a specific distance from fault 2, the lower interface of late volcanic phase, and the upper interface of phyllic alteration with steep slopes (>65°), implying that gold deposition was significantly controlled by the morphological characteristics and distance fields of geologic features. The present alteration–mineralization zone at Axi has a larger width in bending sites (sections No. 35–15 and No. 40–56) than elsewhere, indicating the location of two fluid conduits extending to depth. The prediction-area plots and receiver operating characteristic curves demonstrated that (genetic algorithm optimized support vector regression (GA-SVR)) outperformed multiple nonlinear regression and fuzzy weights-of-evidence, which was proposed as a robust method to solve complicated nonlinear and high-dimensional issues in prospectivity modeling. Our study manifests spatial controls of structure, host rock, and alteration on LS epithermal gold deposition, and highlights the capability of GA-SVR for identifying deposit-scale potential epithermal gold mineralization.

show abstract

“…On one hand, structural control on mineralisation is documented from the district (tens to a hundred km) to the deposit (<1 km), outcrop (up to tens of m) and hand sample (up to tens of cm) scales, relying on field observations, structural measurements and conventional petrological-structural description of mineralised structures (e.g. Allibone et al, 2002Allibone et al, , 2018Ashley and Craw, 2004;Blenkinsop and Doyle, 2014;Masurel et al, 2017;Yang et al, 2018;Hronsky, 2020;Combes et al, 2021). These field-based data can be further processed by geostatistical and modelling techniques (e.g.…”

Section: Introductionmentioning

confidence: 99%

Structural and geochemical ore-forming processes in deformed gold deposits: towards a multiscale and multimethod approach

Perret

André-Mayer

Eglinger

et al. 2021

View full text Add to dashboard Cite

Integrating structural control on mineralisation and geochemical ore-forming processes is crucial when studying deformed ore deposits. Yet, structural and geochemical data are rarely acquired at the same scale: structural control on mineralisation is typically investigated from the district to the deposit and macroscopic scales whereas geochemical ore processes are described at the microscopic scale. The deciphering of a deformation-mineralisation history valid at every scale thus remains challenging.This study proposes a multi-scale approach that enables the reconciliation of structural and geochemical information collected at every scale, applied to the example of the Galat Sufar South gold deposit, Nubian shield, northeastern Sudan. It gathers field and laboratory information by coupling a classical petrological-structural study with high-resolution X-ray computed tomography, electron back-scattered diffraction and laser ablation inductively-coupled plasma mass spectrometry on mineralised sulphide mineral assemblages.This approach demonstrates that there is a linear control on mineralisation expressed from the district to microscopic scales at the Galat Sufar South gold deposit. We highlight the relationships between Atmur-Delgo suturing tectonics, micro-deformation of sulphide minerals, syn-pyrite recrystallisation metal remobilisation, gold liberation and ore upgrading. Our contribution therefore represents another step forward a holistic field-to-laboratory approach for the study of any other sulphide-bearing, structurally-controlled ore deposit type.Supplementary material at https://doi.org/10.6084/m9.figshare.c.5635726

show abstract

Fault geometry and fluid-rock reaction: Combined controls on mineralization in the Xinli gold deposit, Jiaodong Peninsula, China

Cited by 55 publications

References 57 publications

The Formation of the Jiaodong Gold Province

The Formation of the Jiaodong Gold Province

3D Mineral Prospectivity Modeling for the Low-Sulfidation Epithermal Gold Deposit: A Case Study of the Axi Gold Deposit, Western Tianshan, NW China

Structural and geochemical ore-forming processes in deformed gold deposits: towards a multiscale and multimethod approach

Contact Info

Product

Resources

About