Results 91 to 100 of about 6,789 (230)

Alteration Alteration, Mineralization and Geochemistry of Metamorphic Rocks Hosted Hydrothermal Gold Deposit at Rumbia Mountains, Bombana Regency, Southeast Sulawesi, Indonesia

JGEET: Journal of Geoscience, Engineering, Environment and Technology, 2019
In Indonesia, gold is commonly mined from porphyry, epithermal and skarn type deposits that are commonly found in volcanic/magmatic belts. However, were recently numerous gold prospects discovered in association with metamorphic rocks.
Hasria Hasria, Arifudin Idrus, I Wayan Warmada   +2 more
doaj   +1 more source

Preparation and Identification of Heavy Minerals for Archaeometrical Studies: Villa of Fiumana (FC), Italy

Journal of Raman Spectroscopy, Volume 56, Issue 11, Page 1302-1314, November 2025.
This paper presents a new protocol for the laboratory preparation of archaeological samples. Ceramics that have been hand‐crafted using different sediments as raw materials were collected in a Roman Villa sited in Fiumana (FC), Italy. This method aims at concentrating and analysing heavy minerals in the 15–250 μm grain size fraction, studying the ...
S. Andò, G. Vezzoli, M. Barbarano, L. Fornasini, L. Saviane, R. Villicich, D. Bersani   +6 more
wiley   +1 more source

Origin and Evolution of the Ore-Forming Fluids in the Liyuan Gold Deposit, Central North China Craton: Constraints from Fluid Inclusions and H-O-C Isotopic Compositions

Geofluids, 2017
The Liyuan gold deposit is hosted within Archean basement metamorphic rocks and controlled by the NNE-trending faults in the central North China Craton. The ore-forming processes can be divided into three stages (early, middle, and late).
Ying Ma, Suo-Fei Xiong, Hua-Liang Li, Shao-Yong Jiang   +3 more
doaj   +1 more source

Progress in Resource Evaluation Using a Handheld Raman Instrument Developed for Astronaut Missions

Journal of Raman Spectroscopy, Volume 56, Issue 11, Page 1418-1433, November 2025.
Analogue studies were undertaken using a prototype, handheld Raman spectrometer (developed for astronaut usage on the moon) to collect data that would indicate the presence of water and help develop the technology to search for valuable trace elements (such as lithium and caesium).
J. G. T. Armstrong, M. McHugh, J. Parnell, H. N. Lerman, A. Moral, I. B. Hutchinson   +5 more
wiley   +1 more source

Basement Domains Recorded in the Zircon Geochemistry of the Northern Sierra Nevada Batholith

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 11, November 2025.
Abstract The northern Sierra Nevada batholith was emplaced into and across a series of accreted crustal belts that vary considerably in their ages and lithologies. Unlike batholithic segments to the south, the northern Sierra comprises smaller, spatially distinct plutons where geologic relations with the host basement can be observed.
Joella Campbell, M. Robinson Cecil, Jade Star Lackey   +2 more
wiley   +1 more source

Petrophysical Signatures and Mineral Endowment: The Piché Group, Augmitto–Bouzan Sector, Québec, Canada

Geophysical Prospecting, Volume 73, Issue 9, November 2025.
ABSTRACT Hydrothermal alteration plays a crucial role in the precipitation of gold and other metals, particularly within orogenic gold deposits hosted in mafic and ultramafic rocks. This alteration significantly modifies the rock matrix, leading to changes in its petrophysical properties.
Yasaman Nemati, J. Christian Dupuis, Bernard Giroux, Richard Smith, Rita Rodrigues, Bertrand Rottier, Georges Beaudoin   +6 more
wiley   +1 more source

Fluid-controlled element transport and mineralization in subduction zones

Solid Earth Sciences, 2018
Many of the world's metal deposits are associated with hydrothermal fluids in subduction zones, indicating the intimate relationship between subduction process and mineralization.
Yang-Yang Wang, Yilin Xiao
doaj   +1 more source

Evolution of Mayflies (Ephemeroptera) Across the Palearctic Mountains: The Biogeographical Links Between the Caucasus and Adjacent Ranges, Central Asia and the Himalayas

Zoologica Scripta, Volume 54, Issue 6, Page 870-883, November 2025.
ABSTRACT The biodiversity of the highest Palearctic mountains is extraordinary, yet its evolution and biogeographic links from a global perspective remain poorly understood. This study focuses on the diversification and biogeography of mayflies (Ephemeroptera) distributed across several prominent mountain ranges, including the Caucasus and adjacent ...
Ľuboš Hrivniak, Pavel Sroka, Roman J. Godunko, Dmitry M. Palatov, Alexander V. Martynov, Jindřiška Bojková   +5 more
wiley   +1 more source

Auriferous Fluid Evolution and the Role of Carbonaceous Matter in a Saddle‐Reef Gold Deposit: Dufferin Deposit, Meguma Terrane, Nova Scotia, Canada

Geochemistry, Geophysics, Geosystems
The metaturbidite‐hosted, ∼380 Ma Dufferin gold deposit, Meguma terrane, northeastern Appalachian Orogen (Nova Scotia, Canada) is an orogenic gold deposit with mineralized saddle reef‐type quartz veins hosted by metasandstones and black slates in a ...
Mitchell J. Kerr, Jacob J. Hanley, Daniel J. Kontak, Preetysha Ramlochund, Zoltán Zajacz   +4 more
doaj   +1 more source

A four stage evolution of the White Channel gravel: Implications for stratigraphy and palaeoclimates [PDF]

, 2014
Although the White Channel gravel (WCG) of the Klondike district, Yukon, contains gold placers which have been exploited for over a century, few sedimentological studies have been undertaken.
Chapman, Robert, Lowther, Robert, Peakall, Jeff, Pound, Matthew   +3 more
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