Adularia in epithermal veins, Queensland: morphology, structural state and origin

Dong, Guojun; Morrison, Gregg W.

doi:10.1007/bf00208872

Cited by 84 publications

(52 citation statements)

References 19 publications

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“…아듈라리아는 각종 천열수맥(epithermal vein) 에서 sericite (illite)와 수반되는 경우가 흔한데 (Buchanan, 1981;Herald et al, 1987), 특히 최후 기 마그마성 열수광상에 해당하는 아듈라리아-sericite 천열수광상은 지각천부 2 km 이내에서 일 어난다 (Hedenquist and Lowenstern, 1994). 열수가 냉각되기 시작하면서 Al(OH) 4 -은 K, Si와 반응하 여 아듈라리아와 일라이트(또는 sericite)를 형성한 다 (Dong and Morrison, 1995). 이때 유체속에 풍 부한 K, Si는 수산화알루미늄 이온과 반응하여 아 듈라리아을 형성하며, 약산성에서는 아듈라리아나 일라이트를 형성한다 (Reed and Spycher, 1985 (Reed and Spycher, 1985).…”

Section: 지질 및 시료unclassified

“…각 력대의 경우 투수성이 비지대에 비하여 크므로 단 층작용의 후기단계에서는 활발한 유체이동의 통로 가 되며, 맥상광물을 쉽게 형성한다 (Goddard and Evans, 1995). 열수유입은 단층활동에 의해 영향을 받은 열수유체가 투수성이 현저하게 증가된 단층 파쇄대로 유입되며, 단층분쇄물과 반응하여 점토광 물을 생성시키거나 (Tanaka et al, 1995;장태우와 추창오, 1998) (Steiner, I970;Browne, 1978;Cerny and Chapman, 1986;Dong and Morrison, 1995;Gudmundsson and Arnόrrsson, 2005 (Smith, 1974;Cerny and Chapman, 1986),…”

Section: 후기 단층활동과 각력대의 변질작용unclassified

“…예를 들면 San Andreas 단 층대 인근의 화강암질 파쇄암에서 이들은 사장석 을 교대하거나, 단층파쇄대나 미세파쇄대를 채운다 (Silver and James, 1988;Vincent and Ehlig, 1988). (Dong and Morrison, 1995). 맥상으로 산출하는 자형의 아듈라리아는 점차 알칼리성으로 유체가 변화하면서 100∼200℃에서 침전되기 때문 에 비등(boiling)의 증거가 된다 (Browne, 1978;Henley, 1985).…”

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Mineralogical Characteristics of Hydrothermal Laumontite and Adularia in the Breccia Zone of a Fault, Yangbuk-myeon, Gyeongju and Implications for Fault Activity

Choo¹,

Jang²,

장천중

2012

Journal of the Mineralogical Society of Korea

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: Morphological and mineralogical characteristics of laumontite and adularia in the breccia zone in a fault, Yangbuk-myeon, Gyeongju, Korea suggest that they formed by reaction with hydrothermal alteration related to fault activity. Laumontite commonly occurring in the breccia zone is related to the presence of hydrothermal fluids bearing alkaline elements in the zone. Laumonite is characterized by elongated columnar form with aspect ratio varying 5∼10. Laumontite and adularia whose characteristic euhedral forms are indicative of the latest product formed as rapid precipitation from fluids or replacements of Ca-plagioclase. Hydrothermal fluids reacted with intensively fractured granite, typical with high permeability, leached alkaline elements such as Ca, K, allowing laumontite and adularia to be precipitated under neutral to weak alkaline conditions. It is noteworthy that the 1)

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Section: 지질 및 시료unclassified

Section: 후기 단층활동과 각력대의 변질작용unclassified

unclassified

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Mineralogical Characteristics of Hydrothermal Laumontite and Adularia in the Breccia Zone of a Fault, Yangbuk-myeon, Gyeongju and Implications for Fault Activity

Choo¹,

Jang²,

장천중

2012

Journal of the Mineralogical Society of Korea

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“…In general the electrum is in coexistence with adularia. Dong and Morrison (1995) and Browne (1978) stated that adularia is one of the indications of boiling events that are one mechanism believed to be a trigger for the deposition of gold (Drummond and Ohmoto, 1985). Because adularia is closely associated with the other gangue and ore minerals in the Cikoneng and Cibitung shoots, adularia can be used to define the age of mineralization, moreover it is a suitable mineral for 40 Ar /39 Ar dating sample due to its high K content.…”

Section: Geology Of the Cibaliung Depositmentioning

confidence: 99%

“…Four of them are from drill cores of AC-020 (Cknar-01, Cknar-02 and Cknar-03) and drill core of CDDH-015 (Cknar-04) that intrude the Cikoneng shoot, and the rest are from drill cores of AC-013 (Cbtar-01 and Cbtar-02) that intrudes the Cibitung shoot. Following the classification of adularia by Dong and Morrison (1995), most of adularia at the Cibaliung deposit occurs as saccharoidal aggregates of euhedral crystals exhibiting colloform-stratiform texture (Cknar-01, Cknar-02, Cknar-03 and Cbtar-01) and as tabular adularia crystal (Cbtar-02). All of the samples were collected from the drilling core located at deeper levels.…”

Section: Dating Samplesmentioning

confidence: 99%

Timing of the Mineralization and Volcanism at Cibaliung Gold Deposit, Western Java, Indonesia

Harijoko¹,

Sanematsu²,

Duncan

et al. 2004

Resource Geology

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. The Cibaliung deposit is a low‐sulfidation type epithermal gold deposit situated about 70 km west of the Bayah dome complex. The gold‐bearing quartz veins are hosted by basaltic andesite of the Honje Formation, which is comparable to the host rock of gold deposits at the Bayah dome complex. In order to clarify the timing of the mineralization and the volcanism at the Cibaliung area, two radiometric dating methods were applied. First, 40Ar/39Ar dating was conducted on six adularia samples to elucidate the age of mineralization. Second, K‐Ar method was applied to two samples of the host rock, andesite and the Cibaliung tuff, in order to reveal the timing of volcanism. The 40Ar/39Ar dating determined mineralization ages in the range from 11.18 to 10.65 Ma while the K‐Ar dating indicated the age of the andesite and the Cibaliung tuff to be 11.4±0.8 Ma and 4.9±0.6 Ma, respectively. These results imply that the epithermal gold mineralization in the Cibaliung area is related to the volcanic activity that produced the Honje Formation, while the Cibaliung tuff played an important role in the preservation of the Cibaliung deposit. The Cibaliung deposit is the oldest epithermal gold deposit yet discovered in western Java.

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Metallogenesis of the Late Palaeozoic Axi–Tawuerbieke Au–Pb–Zn district in the Tulasu Basin, Western Tianshan, China: Constraints from geological characteristics and isotope geochemistry

Peng

Cheng

et al. 2018

Geological Journal

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The Tulasu Basin is an important epithermal gold ore cluster situated in the Boluokenu Polymetallic Belt, Western Tianshan, China. The Axi Au, Tabei Pb–Zn, and Tawuerbieke Au deposits in this basin represent different types of epithermal mineralization. These are products of the same tectonic‐magmatic‐hydrothermal event, related to the southward subduction of the North Tianshan Ocean beneath the Yili‐Central Tianshan Plate during the Late Devonian to Early Carboniferous. The spatial relationships, preservation levels, and evolution of the three deposits are still debated. Hence, systematic geological field investigations, ore microscopy, and isotopic analyses were carried out on these three deposits. The S–Pb–C–H–O isotopic compositions indicate that the ore‐forming components were derived from the volcanic‐subvolcanic rocks, as well as from circulating meteoric waters. The occurrence of adularia, silicified platy carbonates, and quartz characterized by crustiform/colloform/colloidal textures at Axi indicate that boiling was the main precipitation mechanism for the Au mineralization. The Pb–Zn ores from Tabei are characterized by abundant banded coarse‐grained quartz crystals with dog tooth and comb textures, suggesting that the sulphides precipitated slowly due to conductive cooling. The Tawuerbieke Au deposit is characterized by pervasive silicification and phyllic alteration accompanying veinlet and disseminated ore, which formed via metasomatic water–rock interaction. According to the ore textures, intrusion sizes, and mineral assemblages, it can be inferred that all three deposits experienced different extents of erosion (Axi < Tabei < Tawuerbieke) and that there is exploration potential for concealed porphyry Cu–Au mineralization. Exploration should focus on deep targets beneath the Tawuerbieke Au deposit.

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Adularia in epithermal veins, Queensland: morphology, structural state and origin

Cited by 84 publications

References 19 publications

Mineralogical Characteristics of Hydrothermal Laumontite and Adularia in the Breccia Zone of a Fault, Yangbuk-myeon, Gyeongju and Implications for Fault Activity

Mineralogical Characteristics of Hydrothermal Laumontite and Adularia in the Breccia Zone of a Fault, Yangbuk-myeon, Gyeongju and Implications for Fault Activity

Timing of the Mineralization and Volcanism at Cibaliung Gold Deposit, Western Java, Indonesia

Metallogenesis of the Late Palaeozoic Axi–Tawuerbieke Au–Pb–Zn district in the Tulasu Basin, Western Tianshan, China: Constraints from geological characteristics and isotope geochemistry

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