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Journal articles on the topic 'Advanced argillic alteration'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Ali, Rinal Khaidar, Tri Winarno, and Muhammad Ainurrofiq Jamalulail. "Karakteristik Alterasi dan Mineralisasi Tipe Epitermal Daerah Gunung Budheg dan Sekitarnya, Tulungagung, Jawa Timur." EKSPLORIUM 41, no. 1 (2020): 1. http://dx.doi.org/10.17146/eksplorium.2020.41.1.5676.

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ABSTRAK Penemuan bongkah-bongkah vuggy quartz di sekitar Desa Pojok, daerah Gunung Budheg, Tulungagung, Jawa Timur, mengindikasikan adanya proses endapan mineral di daerah tersebut. Tujuan penelitian ini adalah untuk membahas lebih detail karakteristik alterasi dan mineralisasi serta tipe endapan mineral di daerah penelitian. Metode penelitian berupa pengamatan lapangan dilengkapi dengan analisis laboratorium petrografi, X-ray Difraction (XRD) dan mineragrafi. Satuan batuan di daerah penelitian tersusun atas enam satuan litologi yaitu satuan intrusi dasit, satuan lava andesit, satuan breksi an

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2

Mavrogonatos, Constantinos, Panagiotis Voudouris, Paul G. Spry, et al. "Mineralogical Study of the Advanced Argillic Alteration Zone at the Konos Hill Mo–Cu–Re–Au Porphyry Prospect, NE Greece." Minerals 8, no. 11 (2018): 479. http://dx.doi.org/10.3390/min8110479.

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The Konos Hill prospect in NE Greece represents a telescoped Mo–Cu–Re–Au porphyry occurrence overprinted by deep-level high-sulfidation mineralization. Porphyry-style mineralization is exposed in the deeper parts of the system and comprises quartz stockwork veins hosted in subvolcanic intrusions of granodioritic composition. Ore minerals include pyrite, molybdenite, chalcopyrite, and rheniite. In the upper part of the system, intense hydrothermal alteration resulted in the formation of a silicified zone and the development of various advanced argillic alteration assemblages, which are spatiall

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3

Kilias, S. P., J. Naden, M. Paktsevanoglou, et al. "Multistage alteration, mineralization and ore–forming fluid properties at the Viper (Sappes) Au–Cu–Ag–Te ore body, W. Thrace, Greece." Bulletin of the Geological Society of Greece 47, no. 4 (2016): 1635. http://dx.doi.org/10.12681/bgsg.11007.

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The mineralogy of ore and hydrothermal alteration of the high-sulfidation enargite–Au–Ag–Te Viper (Thrace) orebody, and fluid inclusions, were studied in drillcore samples. The hydrothermal system has evolved through several stages from pre-ore advanced argillic I+vuggy silica alteration, ore-stage advanced argillic II+vuggy silica alteration and silicification that has developed to argillic alteration (sericite)+silicification through pH increase, and a return to acid conditions as crosscutting post-ore advanced argillic alteration III+silicification. Ore is characterized by early barren pyri

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Faesal, Andi, Arifudin Idrus, and Djoko Wintolo. "PROMINE." PROMINE 5, no. 2 (2017): 48–53. http://dx.doi.org/10.33019/promine.v5i2.918.

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The research sites are located in the village of Berambang, Sekotong District, West Lombok Regency,West Nusa Tenggara Province. This area was dominated by volcanic rocks composed of dasiticvolcanic rock, diatrema breccia, and diorite intrusion. Berambang area shows alteration in the form ofpotassic, propylitic, advanced argillic, and argillic alterations where in some places accompanied bypyritisation and stockwork structure, the type of mineralization in this area is a porphyry copper-goldtype. In the potasic alteration zone there are minerals that have a strong anomaly response to themagneti

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WILLAN, ROBERT C. R., and DEBBIE C. ARMSTRONG. "Successive geothermal, volcanic-hydrothermal and contact-metasomatic events in Cenozoic volcanic-arc basalts, South Shetland Islands, Antarctica." Geological Magazine 139, no. 2 (2002): 209–31. http://dx.doi.org/10.1017/s0016756802006301.

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Hydrothermal alteration in volcanic arcs occurs in many settings and may involve magmatic, marine, lacustrine or groundwaters, driven by magmatic, tectonic or thermal events. King George Island, part of the South Shetland Island Cenozoic volcanic arc, contains an 80 km long zone of propylitized volcanic rocks, with numerous occurrences of quartz veining, silicic, sericitic, argillic and advanced-argillic alteration. On Barton Peninsula, a basaltic lava sequence (49–44 Ma) intruded by a small, high-level granodiorite pluton (∼42 Ma), contains these alteration types, previously interpreted as a

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6

Armstrong, Debbie C. "Acid sulphate alteration in a magmatic hydrothermal environment, Barton Peninsula, King George Island, Antarctica." Mineralogical Magazine 59, no. 396 (1995): 429–41. http://dx.doi.org/10.1180/minmag.1995.059.396.05.

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AbstractVolcanic-hosted advanced argillic alteration on Barton Peninsula comprises an assemblage of chalcedonic silica, alunite family minerals, pyrophyllite, pyrite, native sulphur, zunyite and rutile, characteristic of an acid sulphate-type epithermal system. The minerals minamiite, (Na0.36Ca0.27K0.1□0.27)Al3(SO4)2(OH)6, and zunyite, Al13Si5O20(OH,F)18Cl, are reported at this locality, and in Antarctica, for the first time. The WNW-striking, 1 km-long zone of alteration is hosted by early Tertiary andesitic rocks and contained in a 1.5 km-wide depression, rimmed by an arcuate ridge, probably

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Μιχαήλ, Κ., and Μ. Δημήτρουλα. "HYDROTHERMAL ALTERATION AND MINERALIZATION OF THE PETROTA EPITHERMAL SYSTEMS (W.THRACE, GREECE)." Bulletin of the Geological Society of Greece 36, no. 1 (2004): 369. http://dx.doi.org/10.12681/bgsg.16687.

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At the Petrota graben important epithermal zones are developed. On the basis of the mineral assemblages of alteration zones and the type of the host rocks, the epithermal zones can be grouped into three epithermal systems: 1. Perama epithermal system 2. Mavrokoryfi epithermal system and 3. Othondoto epithermal system Hydrothermal alteration zones are developed within volcanoclastic rocks - epiclastic sandstones, andésite tuffs (Perama epithermal system), hyaloclastites (Mavrokoryfi) and rhyolitic rocks (Othondoto). Silicification (in various types) and advanced argillic alteration are the most

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Noori, Lida, Amin Pour, Ghasem Askari, et al. "Comparison of Different Algorithms to Map Hydrothermal Alteration Zones Using ASTER Remote Sensing Data for Polymetallic Vein-Type Ore Exploration: Toroud–Chahshirin Magmatic Belt (TCMB), North Iran." Remote Sensing 11, no. 5 (2019): 495. http://dx.doi.org/10.3390/rs11050495.

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Polymetallic vein-type ores are important sources of precious metal and a principal type of orebody for various base-metals. In this research, Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) remote sensing data were used for mapping hydrothermal alteration zones associated with epithermal polymetallic vein-type mineralization in the Toroud–Chahshirin Magmatic Belt (TCMB), North of Iran. The TCMB is the largest known goldfield and base metals province in the central-north of Iran. Propylitic, phyllic, argillic, and advanced argillic alteration and silicification zones are

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9

Swayze, G. A., R. N. Clark, A. F. H. Goetz, et al. "Mapping Advanced Argillic Alteration at Cuprite, Nevada, Using Imaging Spectroscopy." Economic Geology 109, no. 5 (2014): 1179–221. http://dx.doi.org/10.2113/econgeo.109.5.1179.

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10

Idrus, Arifudin, Aji Syailendra Ubaidillah, I. Wayan Warmada, and Syafruddin Maula. "Geology, Rock Geochemistry and Ore Fluid Characteristics of the Brambang Copper-Gold Porphyry Prospect, Lombok Island, Indonesia." Journal of Geoscience, Engineering, Environment, and Technology 6, no. 1 (2021): 67–73. http://dx.doi.org/10.25299/jgeet.2021.6.1.6145.

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Brambang is one of the porphyry copper-gold prospects/deposits situated along eastern Sunda arc. This study is aimed to understand geological framework, alteration geochemistry and ore fluid characteristics of the prospect. Fieldworks and various laboratory analyses were performed including petrography, ore microscopy, rock geochemistry, chlorite chemistry and fluid inclusion microthermometry. The prospect is composed of andesitic tuff and diorite which are intruded by tonalite porphyries. Tonalite porphyries are interpreted as ore mineralisation-bearing intrusion. Various hydrothermal alterat

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11

Dill, H. G., A. Fricke, K. H. Henning, and C. H. Theune. "Aluminium phosphate mineralization from the hypogene La Vanguardia kaolin deposit (Chile)." Clay Minerals 30, no. 3 (1995): 249–56. http://dx.doi.org/10.1180/claymin.1995.030.3.08.

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AbstractIn the region of Illapel, Chile, dioritic and andesitic rocks of Cretaceous to Paleocene age from the Unidad San Lorenzo Formation have suffered strong alteration resulting in the formation of a kaolin-rich zone, which is mined in the La Vanguardia open pit near Combarbalá. Detailed mineralogical and chemical investigations of channel samples from this mine, involving a combination of optical microscopy, XRD, SEM-EDX, XRF and TEM, permitted recognition of a zone of silicification and a zone of advanced argillic alteration, both of which contain alunite s.s. and aluminium-phosphate-sulp

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Sillitoe, Richard H., Claudio Burgoa, and David R. Hopper. "Porphyry Copper Discovery Beneath the Valeriano Lithocap, Chile." SEG Discovery, no. 106 (July 1, 2016): 1–20. http://dx.doi.org/10.5382/segnews.2016-106.fea.

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ABSTRACT Exploration for porphyry copper deposits beneath barren or poorly mineralized, advanced argillic lithocaps is becoming commonplace; however, there have been few discoveries except in cases where the copper ± gold ± molybdenum mineralization has been partly exposed, typically as a result of partial lithocap erosion. At Valeriano, in the high Andes of northern Chile, completely concealed Miocene porphyry copper-gold mineralization was recently discovered beneath a lithocap. Here, the results of the staged drilling program that led to the discovery are summarized, with emphasis on the k

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Kelm, U., M. Pincheira, J. Oyarzún, and V. Sucha. "Combarbalá advanced argillic alteration zone, Chile: geology, geochemistry, mineralogy and mineralization potential." Applied Earth Science 110, no. 2 (2001): 91–102. http://dx.doi.org/10.1179/aes.2001.110.2.91.

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14

GLUKHOV, Anton, and Petr TIKHOMIROV. "Erguveem Ore Region in the eastern Chukotka Peninsula: An effect of the tectonics of the ore-bearing volcano-structures on composition of the gold-silver mineralization." Domestic geology, no. 3-4 (September 14, 2021): 52–59. http://dx.doi.org/10.47765/0869-7175-2021-10022.

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The geological and structural position of the Pepenveem and Korrida Au-Ag ore occurrences situated in the East-Chukotka segment of the Okhotsk-Chukotka Volcanogenic Belt (OCVB) was studied. The Pepenveem ore occurrence was characterized by one (volcanogenic) mineralization stage. It is localized within a graben-like monocline composed of Late Cretaceous volcanics. A relatively stable tectonic regime caused rather low temperature and pressure gradients during the ore formation and, consequently, simple mineral composition of the ores and absence of advanced argillic alteration. In contrast, the

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15

Imura, Takumi, Yusuke Minami, Tsukasa Ohba, Akiko Matsumoto, Antonio Arribas, and Mitsuhiro Nakagawa. "Hydrothermal Aluminum-Phosphate-Sulfates in Ash from the 2014 Hydrothermal Eruption at Ontake Volcano, Central Honshu, Japan." Minerals 9, no. 8 (2019): 462. http://dx.doi.org/10.3390/min9080462.

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Aluminum-phosphate-sulfates (APS) of the alunite supergroup occur in igneous rocks within zones of advanced argillic and silicic alteration in porphyry and epithermal ore environments. In this study we report on the presence of woodhouseite-rich APS in ash from the 27 September 2014 hydrothermal eruption of Ontake volcano. Scanning electron microscope coupled with energy dispersive X-ray spectrometer (SEM-EDS) and field emission (FE)-SEM-EDS observations show two types of occurrence of woodhouseite: (a) as cores within chemically zoned alunite-APS crystals (Zoned-alunite-woodhouseite-APS), and

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16

Burrows, David R., Michael Rennison, David Burt, and Rod Davies. "The Onto Cu-Au Discovery, Eastern Sumbawa, Indonesia: A Large, Middle Pleistocene Lithocap-Hosted High-Sulfidation Covellite-Pyrite Porphyry Deposit." Economic Geology 115, no. 7 (2020): 1385–412. http://dx.doi.org/10.5382/econgeo.4766.

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Abstract In 2013, a diamond drill program tested an extensive advanced argillic alteration lithocap within the Hu’u project on eastern Sumbawa Island, Indonesia. A very large and blind copper-gold deposit (Onto) was discovered, in which copper occurs largely as disseminated covellite with pyrite, and as pyrite-covellite veinlets in a tabular block measuring at least 1.5 × 1 km, with a vertical thickness of ≥1 km. Copper and gold are spatially related with a series of coalesced porphyry stocks that intrude a polymictic diatreme breccia capped by a sequence of intramaar laminated siltstones, vol

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17

Williams, Nicholas C., and Garry J. Davidson. "POSSIBLE SUBMARINE ADVANCED ARGILLIC ALTERATION AT THE BASIN LAKE PROSPECT, WESTERN TASMANIA, AUSTRALIA." Economic Geology 99, no. 5 (2004): 987–1002. http://dx.doi.org/10.2113/gsecongeo.99.5.987.

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18

Allibone, A. "Gold mineralisation and advanced argillic alteration at the Dobroyde prospect, central New South Wales." Australian Journal of Earth Sciences 44, no. 6 (1997): 727–42. http://dx.doi.org/10.1080/08120099708728350.

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19

Marquis, P., C. Hubert, A. C. Brown, and D. M. Rigg. "Overprinting of early, redistributed Fe and Pb–Zn mineralization by late-stage Au–Ag–Cu deposition at the Dumagami mine, Bousquet district, Abitibi, Quebec." Canadian Journal of Earth Sciences 27, no. 12 (1990): 1651–71. http://dx.doi.org/10.1139/e90-174.

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The Dumagami Au–Ag–Cu deposits are hosted by strongly deformed and altered Archean felsic metavolcanites of the Blake River Group (BRG), southern Abitibi greenstone belt, Canada. Textural and structural features recorded within the lithologies of the BRG at Dumagami indicate that two stages of hydrothermal alteration, separated by a dynamometamorphic event, have affected the volcanic protoliths in the deposit area. Advanced argillic and sericitic alteration zones, massive pyrite bodies, and massive sphalerite–galena bodies resulted from the first stage of hydrothermal activity. Sericitic shell

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20

Bolouki, Seyed Mohammad, Hamid Reza Ramazi, Abbas Maghsoudi, Amin Beiranvand Pour, and Ghahraman Sohrabi. "A Remote Sensing-Based Application of Bayesian Networks for Epithermal Gold Potential Mapping in Ahar-Arasbaran Area, NW Iran." Remote Sensing 12, no. 1 (2019): 105. http://dx.doi.org/10.3390/rs12010105.

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Mapping hydrothermal alteration minerals using multispectral remote sensing satellite imagery provides vital information for the exploration of porphyry and epithermal ore mineralizations. The Ahar-Arasbaran region, NW Iran, contains a variety of porphyry, skarn and epithermal ore deposits. Gold mineralization occurs in the form of epithermal veins and veinlets, which is associated with hydrothermal alteration zones. Thus, the identification of hydrothermal alteration zones is one of the key indicators for targeting new prospective zones of epithermal gold mineralization in the Ahar-Arasbaran

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21

Bottrill, R. S. "A corundum-quartz assemblage in altered volcanic rocks, Bond Range, Tasmania." Mineralogical Magazine 62, no. 3 (1998): 325–32. http://dx.doi.org/10.1180/002646198547710.

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AbstractUnusual corundum-bearing rocks occur in the Bond Range, northern Tasmania, in a hydrothermally altered Cambrian quartz porphyry. The assemblage exhibits quartz and corundum in mutual contact, a rare phenomenon, in association with andalusite, pyrophyllite, diaspore and other minerals. This metastable assemblage apparently resulted from advanced argillic alteration at moderate temperature and low pressure, followed by rapid depressurisation accompanying boiling of hydrothermal, granite-derived fluids. This corundum occurrence appears to be unrelated to the sapphires in placer deposits i

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Taghipour, Batoul, Mohammad Ali Mackizadeh, Mehdi Pourmoghani, Arthur Kasson, and Sedighe Taghipour. "Geology and mineralogy of advanced argillic alteration in the Keshe area (Mt. Karkas), Central Iran." Central European Geology 51, no. 1 (2008): 85–98. http://dx.doi.org/10.1556/ceugeol.51.2008.1.5.

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23

Patrier, Patricia, Sylvain Bruzac, Rebecca Pays, et al. "Occurrence of K-feldspar-bearing hydrothermal breccias in the Bouillante geothermal field (Basse Terre – Guadeloupe)." Bulletin de la Société Géologique de France 184, no. 1-2 (2013): 119–28. http://dx.doi.org/10.2113/gssgfbull.184.1-2.119.

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Abstract Surficial indicators of recent to present geothermal activity are present around Bouillante (Guadeloupe, French West Indies). Until lately, most mineralogical parageneses identified in this area were typical of low temperature alteration (&lt; 100°C) with the occurrence of dioctahedral aluminous smectites accompanied by zeolites (heulandite-clinoptilolite) ± calcite ± silica ± kaolinite, as an evidence of the cap rock of the geothermal system. Recently, numerous boulders of highly silicified breccias containing high temperature minerals (&gt; 200°C) have been identified in the

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Deyell, C. L., J. FH Thompson, R. M. Friedman, and L. A. Groat. "Age and origin of advanced argillic alteration zones and related exotic limonite deposits in the Limonite Creek area, central British Columbia." Canadian Journal of Earth Sciences 37, no. 8 (2000): 1093–107. http://dx.doi.org/10.1139/e00-019.

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The Limonite Creek property in north-central British Columbia contains several zones of silicic and acid-sulphate alteration. These zones grade through advanced argillic and aluminous mineral assemblages to sericitic and regional propylitic alteration. Alteration assemblages are characteristic of high-sulphidation systems, although the abundance of pyrophyllite and andalusite suggests formation at depths below typical epithermal environments. Alteration occurred between 212 and 52 Ma as determined from field relations and U-Pb dating of intrusions. The deformed nature of the alteration assembl

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Shebl, Ali, Mahmoud Abdellatif, Sayed O. Elkhateeb, and Árpád Csámer. "Multisource Data Analysis for Gold Potentiality Mapping of Atalla Area and Its Environs, Central Eastern Desert, Egypt." Minerals 11, no. 6 (2021): 641. http://dx.doi.org/10.3390/min11060641.

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In this research, airborne geophysical and remote sensing datasets were integrated for gold potentiality mapping (GPM) over the Atalla area in Central Eastern Desert, Egypt. Utilizing aeromagnetic data, detailed structural complexity maps were constructed using the center for exploration targeting (CET) procedure. Then, spectrometric gamma-ray data primarily located hydrothermally altered tracts with discriminating various rock units. The latter are precisely outlined by implementing various techniques (false-color composite (FCC), band ratio (BR), relative absorption band depth (RBD), directe

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Ramos, Yuddy, Kalifa Goïta, and Stéphane Péloquin. "Mapping advanced argillic alteration zones with ASTER and Hyperion data in the Andes Mountains of Peru." Journal of Applied Remote Sensing 10, no. 2 (2016): 026031. http://dx.doi.org/10.1117/1.jrs.10.026031.

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27

Lerouge, C., A. Kunov, C. Fléhoc, et al. "Constraints of stable isotopes on the origin of alunite from advanced argillic alteration systems in Bulgaria." Journal of Geochemical Exploration 90, no. 3 (2006): 166–82. http://dx.doi.org/10.1016/j.gexplo.2005.11.001.

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28

Feizi, F., and E. Mansouri. "Recognition of a porphyry system using ASTER data in Bideghan – Qom province (central of Iran)." Solid Earth Discussions 6, no. 2 (2014): 1765–98. http://dx.doi.org/10.5194/sed-6-1765-2014.

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Abstract. The Bideghan area is located south of the Qom province (central of Iran). The most impressive geological features in the studied area are the Eocene sequences which are intruded by volcanic rocks with basic compositions. Advanced Space borne Thermal Emission and Reflection Radiometer (ASTER) image processing have been used for hydrothermal alteration mapping and lineaments identification in the investigated area. In this research false color composite, band ratio, Principal Component Analysis (PCA), Least Square Fit (LS-Fit) and Spectral Angel Mapping (SAM) techniques were applied on

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Papoulis, D., P. Tsolis-Katagas, and C. Katagas. "NEW FIND OF ZUNYITE IN ADVANCED ARGILLIC ALTERATION OF RHYOLITES, KOS ISLAND, SOUTH AEGEAN VOLCANIC ARC , GREECE." Bulletin of the Geological Society of Greece 36, no. 1 (2004): 474. http://dx.doi.org/10.12681/bgsg.16738.

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Zunyite [Ali3SÌ5C>2o(OH,F)i8CI], an extremely rare mineral, was found as an accessory mineral in highly altered rhyolitic rocks at Kefalos, southwestern Kos, and in a completely kaolinized rhyolitic dyke at Asfendiou, northeastern Kos. It is associated with dickite, kaolinite, quartz and minor pyrophyllite. Kos Island contains both Tertiary and Quaternary volcanic rocks. Zunyite has been identified by XRD and studied by SEM, EDS, Raman spectroscopy and FTIR spectroscopy. The presence of zunyite, in the highly altered samples is significant for the determination of the conditions of the hydr

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30

Sahlström, Fredrik, Zhaoshan Chang, Antonio Arribas, et al. "Reconstruction of an Early Permian, Sublacustrine Magmatic-Hydrothermal System: Mount Carlton Epithermal Au-Ag-Cu Deposit, Northeastern Australia." Economic Geology 115, no. 1 (2020): 129–52. http://dx.doi.org/10.5382/econgeo.4696.

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Abstract The Mt. Carlton Au-Ag-Cu deposit, northern Bowen basin, northeastern Australia, is an uncommon example of a sublacustrine hydrothermal system containing economic high-sulfidation epithermal mineralization. The deposit formed in the early Permian and comprises vein- and hydrothermal breccia-hosted Au-Cu mineralization within a massive rhyodacite porphyry (V2 open pit) and stratabound Ag-barite mineralization within volcano-lacustrine sedimentary rocks (A39 open pit). These orebodies are all associated with extensive advanced argillic alteration of the volcanic host rocks. Stable isotop

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Camprubí, Antoni, Edith Fuentes-Guzmán, Pilar Ortega-Larrocea, et al. "The Pliocene Ixtacamaxtitlán low sulfidation epithermal deposit (Puebla, Mexico): A case of fossil fungi consortia in a steam-heated environment." Boletín de la Sociedad Geológica Mexicana 72, no. 3 (2020): A140420. http://dx.doi.org/10.18268/bsgm2020v72n3a140420.

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The Ixtacamaxtitlán area in northern Puebla (central Mexico) contains middle Miocene Cu-Mo-Au porphyry/skarn and Pliocene low-sulfidation Au-Ag epithermal deposits that are geologically associated with the evolution of the Trans-Mexican Volcanic Belt (TMVB). In this paper, a new 40Ar/39Ar age (2.87 ± 0.41 Ma) is provided for rhombohedral alunite from a kaolinite + alunite ± opal ± cristobalite ± smectite advanced argillic alteration assemblage. This age contributes to the definition of a metallogenic province that is confined to the TMVB, a relevant feature for regional exploration. A ~12 My g

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So, Chil-Sup, Seong-Taek Yun, and Maeng-Eon Park. "Geochemistry of a fossil hydrothermal system at Barton Peninsula, King George Island." Antarctic Science 7, no. 1 (1995): 63–72. http://dx.doi.org/10.1017/s0954102095000101.

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A fossil hydrothermal system on Barton Peninsula, King George Island, Antarctica, formed a series of lead-zinc- and pyrite + native sulphur-bearing epithermal quartz ± calcite veins, filling fault-related fractures in hydrothermally altered volcanic rocks of Eocene age. The lead-zinc veins occur within argillic hydrothermal alteration zones, whereas the pyrite + native sulphur veins are found within advanced argillic alteration zones. Fluid inclusion data indicate that the vein formation occurred at temperatures between about 125° and 370°C (sphalerite deposition formed at 123–211°C) from flui

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Melfos, Vasilios, Panagiotis Voudouris, Todor Serafimovski, and Goran Tasev. "Fluid Inclusions at the Plavica Au-Ag-Cu Telescoped Porphyry–Epithermal System, Former Yugoslavian Republic of Macedonia (FYROM)." Geosciences 9, no. 2 (2019): 88. http://dx.doi.org/10.3390/geosciences9020088.

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The Plavica Au-Ag-Cu porphyry and high sulfidation (HS) epithermal deposit is located at the Kratovo–Zlatovo volcanic field in Eastern Former Yugoslavian Republic of Macedonia. In this study, new fluid inclusions data provide additional evidence of the presence of a porphyry style mineralization which is associated with an overlain HS epithermal deposit. The Oligocene–Miocene magmatic rocks have a calc–alkaline to high-K calc–alkaline affinity and consist of sub-volcanic intrusions and volcanic rocks. Previous studies distinguished four alteration types: (a) Sericitic, (b) advanced argillic, (

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Bonnet, Anne-Laure, Louise Corriveau, and Marc R. La Flèche. "Chemical imprint of highly metamorphosed volcanic-hosted hydrothermal alterations in the La Romaine Supracrustal Belt, eastern Grenville Province, Quebec." Canadian Journal of Earth Sciences 42, no. 10 (2005): 1783–814. http://dx.doi.org/10.1139/e05-098.

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The La Romaine Supracrustal Belt and the southeastern end of the Wakeham Group in the eastern Grenville Province, Canada, host a series of Pinwarian, 1.50 Ga felsic-dominated volcanic centres metamorphosed at amphibolite to granulite facies during the Grenville orogeny. The centres are interpreted as being related to the emergence of rhyolitic domes in shallow-marine intra-arc basins within the active Pinwarian continental magmatic arc. High-grade metamorphosed hydrothermal alteration zones are intimately associated with pyroclastic deposits composing these volcanic centres and an overlying co

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Sutarto, Sutarto, Arifudin Idrus, Agung Harijoko, et al. "Hydrothermal Alteration and Mineralization of the Randu Kuning Porphyry Cu-Au and Intermediate Sulphidation Epithermal Au-Base Metals Deposits in Selogiri, Central Java, Indonesia." Journal of Applied Geology 1, no. 1 (2016): 1. http://dx.doi.org/10.22146/jag.26951.

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The Randu Kuning Porphyry Cu-Au prospect area is situated in the Selogiri district, Wonogiri regency, Central Java, Indonesia, about 40 km to the South-East from Solo city, or approximately 70 km east of Yogyakarta city. The Randu Kuning area and its vicinity is a part of the East Java Southern Mountain Zone, mostly occupied by both plutonic and volcanic igneous rocks, volcaniclastic, silisiclastic and carbonate rocks. Magmatism-volcanism products were indicated by the abundant of igneous and volcaniclastic rocks of Mandalika and Semilir Formation. The Alteration zones distribution are general

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Michael, C. "EPITHERMAL SYSTEMS AND GOLD MINERALIZATION IN WESTERN THRACE (NORTHERN GREECE)." Bulletin of the Geological Society of Greece 36, no. 1 (2004): 416. http://dx.doi.org/10.12681/bgsg.16727.

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Extensive epithermal systems occur within the Tertiary volcanosedimentary basins of western Thrace northern Greece. Gold deposits or perspective gold districts, related to the above epithermal systems have been recently found in the area. The gold mineralization is of the high – sulfidation type and is associated to a diversity in composition and style volcanic activity. Sappes epithermal system is the most important (Saint Demetrios and Viper deposits) and has developed in volcanic "ocks of intermediate composition accompanied by subvolcanic intrusives (dacite - andésites) and plutonio rocks

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Bijnaar, Ginny, Manfred J. van Bergen, and Theo E. Wong. "The kyanite quartzite of Bosland (Suriname): evidence for a Precambrian metamorphosed alteration system." Netherlands Journal of Geosciences - Geologie en Mijnbouw 95, no. 4 (2016): 447–65. http://dx.doi.org/10.1017/njg.2016.38.

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AbstractThis article investigates the origin of a rare occurrence of kyanite quartzites in the Palaeoproterozoic greenstone belt of Suriname. The rocks form elongated hills in the Bosland area, Brokopondo district, where they are associated with meta-sedimentary, meta-volcanic and granitic lithologies. Their mineral content and unusual Si- and Al-rich chemical composition are inferred to be the result of advanced argillic alteration of felsic volcanic tuffs and a later overprint by regional metamorphism up to lower amphibolite facies during the Trans-Amazonian orogeny. Structurally, the Boslan

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Son, Young-Sun, Byoung-Woon You, Eun-Seok Bang, et al. "Mapping Alteration Mineralogy in Eastern Tsogttsetsii, Mongolia, Based on the WorldView-3 and Field Shortwave-Infrared Spectroscopy Analyses." Remote Sensing 13, no. 5 (2021): 914. http://dx.doi.org/10.3390/rs13050914.

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This study produces alteration mineral maps based on WorldView-3 (WV-3) data and field shortwave-infrared (SWIR) spectroscopy. It is supported by conventional analytical methods such as X-ray diffraction, X-ray fluorescence, and electron probe X-ray micro analyzer as an initial step for mineral exploration in eastern Tsogttsetsii, Mongolia, where access is limited. Distributions of advanced argillic minerals (alunite, dickite, and kaolinite), illite/smectite (illite, smectite, and mixed-layered illite-smectite), and ammonium minerals (buddingtonite and NH4-illite) were mapped using the decorre

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Seewald, Jeffrey S., Eoghan P. Reeves, Wolfgang Bach, et al. "Geochemistry of hot-springs at the SuSu Knolls hydrothermal field, Eastern Manus Basin: Advanced argillic alteration and vent fluid acidity." Geochimica et Cosmochimica Acta 255 (June 2019): 25–48. http://dx.doi.org/10.1016/j.gca.2019.03.034.

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Higueras, P., R. Oyarzun, R. Lunar, J. Sierra, and J. Parras. "The Las Cuevas deposit, Almaden district (Spain): An unusual case of deep-seated advanced argillic alteration related to mercury mineralization." Mineralium Deposita 34, no. 2 (1999): 211–14. http://dx.doi.org/10.1007/s001260050197.

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Khashgerel, Bat-Erdene, Imants Kavalieris, and Ken-ichiro Hayashi. "Mineralogy, textures, and whole-rock geochemistry of advanced argillic alteration: Hugo Dummett porphyry Cu–Au deposit, Oyu Tolgoi mineral district, Mongolia." Mineralium Deposita 43, no. 8 (2008): 913–32. http://dx.doi.org/10.1007/s00126-008-0205-3.

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Brathwaite, R., M. Simpson, K. Faure, and D. Skinner. "Telescoped porphyry Cu-Mo-Au mineralisation, advanced argillic alteration and quartz-sulphide-gold-anhydrite veins in the Thames District, New Zealand." Mineralium Deposita 36, no. 7 (2001): 623–40. http://dx.doi.org/10.1007/s001260100182.

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Flahaut, Jessica, Janice L. Bishop, Simone Silvestro, Dario Tedesco, Isabelle Daniel, and Damien Loizeau. "The Italian Solfatara as an analog for Mars fumarolic alteration." American Mineralogist 104, no. 11 (2019): 1565–77. http://dx.doi.org/10.2138/am-2019-6899.

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Abstract The first definitive evidence for continental vents on Mars is the in situ detection of amorphous silica-rich outcrops by the Mars Exploration Rover Spirit. These outcrops have been tentatively interpreted as the result of either acid sulfate leaching in fumarolic environments or direct precipitation from hot springs. Such environments represent prime targets for upcoming astrobiology missions but remain difficult to identify with certainty, especially from orbit. To contribute to the identification of fumaroles and hot spring deposits on Mars, we surveyed their characteristics at the

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Bozkaya, Ömer, Ivan A. Baksheev, Nurullah Hanilçi, et al. "Tourmaline Composition of the Kışladağ Porphyry Au Deposit, Western Turkey: Implication of Epithermal Overprint." Minerals 10, no. 9 (2020): 789. http://dx.doi.org/10.3390/min10090789.

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The Kışladağ porphyry Au deposit occurs in a middle Miocene magmatic complex comprising three different intrusions and magmatic-hydrothermal brecciation related to the multiphase effects of the different intrusions. Tourmaline occurrences are common throughout the deposit, mostly as an outer alteration rim around the veins with lesser amounts disseminated in the intrusions, and are associated with every phase of mineralization. Tourmaline mineralization has developed as a tourmaline-rich matrix in brecciated zones and tourmaline-quartz and/or tourmaline-sulfide veinlets within the different in

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Mars, John C., Gilpin R. Robinson, Jane M. Hammarstrom, et al. "Porphyry Copper Potential of the United States Southern Basin and Range Using ASTER Data Integrated with Geochemical and Geologic Datasets to Assess Potential Near-Surface Deposits in Well-Explored Permissive Tracts." Economic Geology 114, no. 6 (2019): 1095–121. http://dx.doi.org/10.5382/econgeo.4675.

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Abstract ArcGIS was used to spatially assess and rank potential porphyry copper deposits using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data together with geochemical and geologic datasets in order to estimate undiscovered deposits in the southern Basin and Range Province in the southwestern United States. The assessment was done using a traditional expert opinion three-part method and a prospectivity model developed using weights of evidence and logistic regression techniques to determine if ASTER data integrated with other geologic datasets can be used to find a

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Dube, B., P. Mercier-Langevin, I. Kjarsgaard, et al. "The Bousquet 2-Dumagami World-Class Archean Au-Rich Volcanogenic Massive Sulfide Deposit, Abitibi, Quebec: Metamorphosed Submarine Advanced Argillic Alteration Footprint and Genesis." Economic Geology 109, no. 1 (2013): 121–66. http://dx.doi.org/10.2113/econgeo.109.1.121.

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Voudouris, Panagiotis C. "Hydrothermal corundum, topaz, diaspore and alunite supergroup minerals in the advanced argillic alteration lithocap of the Kassiteres-Sapes porphyry-epithermal system, western Thrace, Greece." Neues Jahrbuch f??r Mineralogie - Abhandlungen: Journal of Mineralogy and Geoche 191, no. 2 (2014): 117–36. http://dx.doi.org/10.1127/0077-7757/2014/0251.

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Shirmard, Hodjat, Ehsan Farahbakhsh, Amin Beiranvand Pour, Aidy M. Muslim, R. Dietmar Müller, and Rohitash Chandra. "Integration of Selective Dimensionality Reduction Techniques for Mineral Exploration Using ASTER Satellite Data." Remote Sensing 12, no. 8 (2020): 1261. http://dx.doi.org/10.3390/rs12081261.

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There are a significant number of image processing methods that have been developed during the past decades for detecting anomalous areas, such as hydrothermal alteration zones, using satellite images. Among these methods, dimensionality reduction or transformation techniques are known to be a robust type of methods, which are helpful, as they reduce the extent of a study area at the initial stage of mineral exploration. Principal component analysis (PCA), independent component analysis (ICA), and minimum noise fraction (MNF) are the dimensionality reduction techniques known as multivariate st

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Juliani, Caetano, Rafael Rodrigues de Assis, Lena Virgínia Soares Monteiro, Carlos Marcello Dias Fernandes, José Eduardo Zimmermann da Silva Martins, and Jhoseph Ricardo Costa e Costa. "Gold in Paleoproterozoic (2.1 to 1.77 Ga) Continental Magmatic Arcs at the Tapajós and Juruena Mineral Provinces (Amazonian Craton, Brazil): A New Frontier for the Exploration of Epithermal–Porphyry and Related Deposits." Minerals 11, no. 7 (2021): 714. http://dx.doi.org/10.3390/min11070714.

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This review paper aims to integrate geological, tectonic and metallogenetic data, including new data, and propose a regional model for the gold (and base metal) mineralization in the south Amazonian Craton to support the mineral exploration concerning magmatic–hydrothermal deposits. The Proterozoic evolution of the Amazonian Craton comprises the accretion of terrains to the Archean Carajás Mineral Province. In the Tapajós and Juruena mineral provinces, located at the south part of the Amazonian craton, a long-lived ocean–continent subduction event produced ca. 2.0 to 1.77 Ga continental magmat

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Allibone, Andrew H., Geoffrey R. Cordery, Gregg W. Morrison, Subhash Jaireth, and Jeffrey W. Lindhorst. "Synchronous advanced argillic alteration and deformation in a shear zone-hosted magmatic hydrothermal Au-Ag deposit at the Temora (Gidginburg) Mine, New South Wales, Australia." Economic Geology 90, no. 6 (1995): 1570–603. http://dx.doi.org/10.2113/gsecongeo.90.6.1570.

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