Controls of gold-quartz vein formation during regional folding in amphibolite-facies, marble-dominated metasediments of the Navachab Gold Mine in the Pan-African Damara Belt, Namibia

2005 ◽  
Vol 108 (3) ◽  
pp. 365-380 ◽  
Author(s):  
A. F.M. Kisters
Keyword(s):  
Quartz Vein ◽  
Amphibolite Facies ◽  
Gold Mine ◽  
Vein Formation ◽  
Pan African

scholarly journals Geology and Geochemistry of Iroko-Granites Southwestern Nigeria: implication on provenance

2020 ◽  
Vol 2 (3) ◽  
Author(s):  
Olusola A. OlaOlorun ◽  
Segun Akinyemi ◽  
Ayomide J. Oluwaleye ◽  
Joseph Agbemuko
Keyword(s):  
Trace Elements ◽  
Field Strength ◽  
Quartz Vein ◽  
High Field ◽  
High Field Strength ◽  
Southwestern Nigeria ◽  
Sparse Vegetation ◽  
Pan African ◽  
Distinctive Type ◽  
Vegetation Structures

The geology, geochemistry of Iroko-granites have been studied and reported in this paper. The study area has been described as of Archaean –Early Proterozoic terrain underlain by migmatite-gneiss-quartzite complex with supracustal rocks. Large  number  of  granites which outcrops in Iroko-Ekiti represent a typical occurrence  of  granitoids sporadically  distributed  in  the  basement and  are known to  belong  to  the  Older Granite  suites,  which  are   attributable  to  the  Pan-African  Orogeny(750± 150Ma). The rocks occur, mostly as flat and low lying within sparse vegetation. Structures common on and around the outcrops include quartz vein, veinlets, pegmatite dykes which trend North-south, discrete exfoliated surfaces and xenoliths of older rocks. This study reveals that the granites belong to calc-alkalic suites, demonstrate metaluminous nature, and exhibit characteristics of I-type granites. The granite is a distinctive type in that it is relatively highly potassic, has high FeO/(FeO + MgO) ratio, and high average Zr (299.75ppm) concentration with other high field strength elements. The trace elements study implicates pronounced fractional crystallization during evolution of the granites and thus petrogenetically discriminates as Syn-collision provenance.

scholarly journals Quartz vein formation by local dehydration embrittlement along the deep, tremorgenic subduction thrust interface

Geology ◽  
2017 ◽  
Vol 46 (1) ◽  
pp. 67-70 ◽  
Author(s):  
Åke Fagereng ◽  
Johann F.A. Diener ◽  
Francesca Meneghini ◽  
Chris Harris ◽  
Ada Kvadsheim
Keyword(s):  
Quartz Vein ◽  
Vein Formation

Bedding-parallel shear, thrusting and quartz vein formation in witwatersrand quartzites

1987 ◽  
Vol 9 (4) ◽  
pp. 419-427 ◽  
Author(s):  
C Roering ◽  
C.A Smit
Keyword(s):  
Quartz Vein ◽  
Vein Formation

Giant quartz vein formation and high-elevation meteoric fluid infiltration into the South Armorican Shear Zone: geological, fluid inclusion and stable isotope evidence

2012 ◽  
Vol 169 (1) ◽  
pp. 17-27 ◽  
Author(s):  
Jérémie Lemarchand ◽  
Philippe Boulvais ◽  
Martin Gaboriau ◽  
Marie-Christine Boiron ◽  
Romain Tartèse ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Fluid Inclusion ◽  
Shear Zone ◽  
Quartz Vein ◽  
High Elevation ◽  
The South ◽  
Vein Formation ◽  
Fluid Infiltration ◽  
Isotope Evidence

The texture and composition of tourmaline in metasediments of the Sinai, Egypt: Implications for the tectono-metamorphic evolution of the Pan-African basement

2007 ◽  
Vol 71 (1) ◽  
pp. 17-40 ◽  
Author(s):  
M. M. Abu El-Enen ◽  
M. Okrusch
Keyword(s):  
Regional Metamorphism ◽  
Metamorphic Grade ◽  
Crystalline Basement ◽  
Amphibolite Facies ◽  
Metamorphic Rocks ◽  
Pan African ◽  
Chemical Signatures ◽  
Mineral Assemblages ◽  
The Matrix ◽  
Metamorphic Facies

AbstractAccessory tourmaline in metasediments from the Sinai crystalline basement exhibits textural and chemical signatures that relate to the evolution of regional metamorphism and deformation during the Pan-African orogeny and testifies to different P-T path segments. Tourmaline inclusions in various porphyroblasts were formed during the prograde phase of metamorphism; acicular to prismatic crystals in the matrix, oriented sub-parallel to, and enveloped by, the main foliation crystallized syntectonically under prograde and peak metamorphic conditions; tourmaline cross-cutting the main foliation may have formed just after the peak or during the retrograde phase of metamorphism. Some of the cores in tourmaline crystals, showing different colours, are interpreted as former detrital grains. The abundance of tourmaline decreases with increasing peak metamorphic conditions. The tourmaline investigated belongs to the schorl-dravitess group, generally with XMg of 0.42–0.73 and XCa = Ca/(Ca+Na+K+□) of 0.02–0.24, typical of tourmalines in metapelites and metapsammites; whereas detrital cores have been derived from various sources, including former tourmaline-quartz and pre-existing high-metamorphic rocks. Tourmaline of the Sinai metasediments was formed during metamorphism of the sedimentary precursors, essentially in a closed system, where clay minerals and organic matter, together with detrital tourmaline, served as the source of boron. Although a metamorphic facies should be defined by characteristic mineral assemblages present in metamorphic rocks, tourmaline chemistry is a good monitor of P-T conditions in the metapelites and semi-metapelites investigated, showing an increase in XMg with increasing metamorphic grade, where XturMg = 0.60 distinguishes between greenschist and lower-amphibolite facies, while XturMg = 0.65 could distinguish lower- from middle- to upper-amphibolite facies. The results of tourmaline-biotite geothermometry compare well with our former temperature estimates using conventional geothermometry and phase-diagram modelling.

The Gerfed gold deposit: fluids and PT-conditions for quartz vein formation (Yenisei Ridge, Russia)

2011 ◽  
Vol 52 (11) ◽  
pp. 1461-1473 ◽  
Author(s):  
N.A. Gibsher ◽  
A.A. Tomilenko ◽  
A.M. Sazonov ◽  
M.A. Ryabukha ◽  
A.L. Timkina
Keyword(s):  
Gold Deposit ◽  
Quartz Vein ◽  
Yenisei Ridge ◽  
Vein Formation

Hydrothermal Quartz Vein Formation, Revealed by Coupled SEM-CL Imaging and Fluid Inclusion Microthermometry: Shuteen Complex, South Gobi, Mongolia

2005 ◽  
Vol 55 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Bayaraa Batkhishig ◽  
Greg Bignall ◽  
Noriyoshi Tsuchiya
Keyword(s):  
Fluid Inclusion ◽  
Quartz Vein ◽  
Hydrothermal Quartz ◽  
Vein Formation

scholarly journals Geological and 40Ar/39Ar geochronological constraints on the timing of quartz vein formation in Meguma Group lode-gold deposits, Nova Scotia

10.4138/1704 ◽  
1990 ◽  
Vol 26 (3) ◽  
Author(s):  
Daniel J. Kontak ◽  
Paul K. Smith ◽  
Peter Reynolds ◽  
Keith Taylor
Keyword(s):  
Nova Scotia ◽  
Quartz Vein ◽  
Gold Deposits ◽  
Lode Gold ◽  
Vein Formation ◽  
Lode Gold Deposits ◽  
Geochronological Constraints
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