Results 181 to 190 of about 2,316 (218)

Cu diffusivity in granitic melts with application to the formation of porphyry Cu deposits

Contributions to Mineralogy and Petrology, 2018
We report new experimental data of Cu diffusivity in granite porphyry melts with 0.01 and 3.9 wt% H2O at 0.15–1.0 GPa and 973–1523 K. A diffusion couple method was used for the nominally anhydrous granitic melt, whereas a Cu diffusion-in method using Pt95Cu5 as the source of Cu was applied to the hydrous granitic melt.
Huaiwei Ni, Huifeng Shi, Li Zhang, Wan-Cai Li, Xuan Guo, Ting Liang   +5 more
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A Group of Papers on Porphyry Cu Deposits: Introduction

Economic Geology, 2010
The five papers that follow this brief introduction focus on giant porphyry Cu systems. Porphyry Cu deposits are some of the larger and better understood ore deposits on earth. Studies on porphyry Cu deposits published in Economic Geology in the past two years indicate that interest in these deposits continues on a wide range of topics, including ...
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The key role of volatile-rich magma replenishment in the formation of porphyry Cu-Mo deposits: A case study of Gangjiang porphyry Cu-Mo deposit, Tibet

Acta Petrologica Sinica, 2021
西藏冈底斯带中段的岗讲斑岩铜-钼矿床发育多期次侵入体，而成矿作用主要与其中一期岩体（流纹英安斑岩）密切相关。为探究其原因，本文对岗讲斑岩铜-钼矿床中发育的各期次侵入体进行了全岩主、微量元素分析，并重点研究各期次侵入体内部新鲜斑晶（黑云母、斜长石）和副矿物（锆石、磷灰石）的化学成分和结构特征。结果表明，矿区各期次侵入岩均属于高钾钙碱性系列，具有相近的锆石饱和温度，都来自较为氧化的岩浆。此外，相比其他期次侵入岩，主成矿期的流纹英安斑岩中的磷灰石具有较高的SO3、Cl含量，较低的F含量；黑云母含有较高的Cl含量和较低的F含量；同时，斜长石发育反环带。这些证据表明，在主成矿期岩浆就位之前，存在富S、Cl的偏基性岩浆注入了深部岩浆房，并发生岩浆混合作用，这不仅导致了主成矿期斑岩体的就位 ...
TIAN Feng, LENG ChengBiao, ZHANG XingChun, TIAN ZhenDong, ZHANG Wei   +4 more
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Clay Mineralogy and Zonation in the Campana Mahuida Porphyry Cu Deposit, Neuquen, Argentina: Implications for Porphyry Cu Exploration

Economic Geology, 2007
Analysis of clay mineralogy and illite crystallinity in the clay-size fraction (
M. Franchini, A. Impiccini, L. Meinert, G. Grathoff, I. B.A. Schalamuk   +4 more
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The La Fortuna Cu-Au porphyry deposit, Chile

2005
La Fortuna is a newly-discovered porphyry deposit that occurs at the southern end of the Eocene-Oligocene metallogenic province in northern Chile. This paper describes the geological features of the deposit, and comments on the implications for mineral exploration.
Piotr Paleczek, Waldo Cuadra, Michael Donnelly, Robert Page   +3 more
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Exploration potential of Cu isotope fractionation in porphyry copper deposits

Journal of Geochemical Exploration, 2009
Abstract We examined the copper isotope ratio of primary high temperature Cu-sulfides, secondary low temperature Cu-sulfides (and Cu-oxides) as well as Fe-oxides in the leach cap, which represent the weathered remains of a spectrum of Cu mineralization, from nine porphyry copper deposits.
Ryan Mathur, Spencer Titley, Fernando Barra, Susan Brantley, Marc Wilson, Allison Phillips, Francisco Munizaga, Victor Maksaev, Jeff Vervoort, Garret Hart   +9 more
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Formation mechanism of dwarfish Cu-Au porphyry deposits of Macedonia

Doklady Earth Sciences, 2010
Regularities in the distribution and formation mechanism of giant Cu porphyry deposits have been discussed by many authors. Most recent works are dedicated to the problem of their formation [1]. The deposits of Macedonia discussed in this communica tion usually contain up to 150 000 t of copper with the Buchim deposits likely being the smallest ...
A. V. Volkov, T. Serafimovski, V. Stefanova, A. A. Sidorov   +3 more
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Geology of the Ox Lake Cu - Mo porphyry deposit

2010
The Ox Lake copper-molybdenum deposit is locallized in the margin and contact zone of a Late Cretaceous granodiorite porphyry. Hazelton Group rocks, including a lower Felsic Tuff, a middle Andesitic Tuff and an upper Sandstone-SiItstone, are country rocks in the area.
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Origin of the Cenozoic porphyry Cu deposits in southern Tibet

2014
The Gangdese magmatic belt features extensive Cenozoic magmatic rocks that record geodynamic changes related to the India–Asia collision starting at ~55–50 Ma. Paleocene–Eocene magmas throughout the belt have similar continental arc features. Their intrusive rocks have intermediate [La/Yb]N and intermediate-to-low Sr/Y ratios, negative Eu anomalies ...
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Copper inclusions in sheet silicates from porphyry Cu deposits

Nature, 1988
Economic geologists have studied the Cu contents of biotite for at least a quarter of a century as potential guides for exploration and as clues to the genesis of porphyry copper deposits1–12. These earlier studies used bulk analytical techniques, and a common, although cautious, assumption was that Cu substituted for Fe in the octahedral sites of the ...
Eugene S. Ilton, David R. Veblen
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