Results 31 to 40 of about 5,229 (211)

Petrogenesis and Tectonic Setting of Late Mesozoic Felsic Magmatic Rocks in the Wangmushan Mining District, Northern Fujian, South China

Geological Journal, EarlyView.
The rhyolitic ignimbrite and K‐feldspar granite porphyry from the Wangmushan mining district, northern Fujian yield ages of 173.8 ± 0.8 and 102.6 ± 0.4 Ma, respectively. Geochemical data, zircon trace elements, whole‐rock Sr–Nd–Pb isotope data, and zircon Hf isotopic compositions indicate that the rhyolitic ignimbrite originated from partial remelting ...
Wei Shaogang, Hong Wentao, Xiao Fan, Jin Guodong, Shi Hongyang, Ma Zhiwang, Wu Chen, Xue Yujingyang   +7 more
wiley   +1 more source

"El Toro” gold mine (Peru): geological features and perspectives

Вісник Київського національного університету імені Тараса Шевченка. Серія Геологія, 2018
El Toro is an epithermal gold deposit with an epizonal conformation being hosted in the clastic sediments of lower Cretaceous (Chimu Formation). The ore deposit is located in La Libertad Region in northern Peru.
Н. Villena
doaj   +1 more source

Managing and visualising geochemical data for tephra correlation with the IntChron Integration Tool

Journal of Quaternary Science, EarlyView.
ABSTRACT There is now a wealth of glass‐shard geochemical data for volcanic ash (tephra) layers from a wide range of volcanoes and eruptions, providing invaluable datasets for tephrochronology. However, compilation of published data to assess tephra correlations leads to large files and requires careful management.
Victoria C. Smith, Danielle McLean, Eloise Wilkinson‐Rowe, Emma L. Horn, Gavin Kane, Christopher Bronk Ramsey   +5 more
wiley   +1 more source

Modeling heat transfer from a convecting, crystallizing, replenished silicic magma chamber at an oceanic spreading center

Geochemistry, Geophysics, Geosystems, 2011
Most hydrothermal systems at oceanic spreading centers are underlain by basaltic magma bodies; however, some are underlain by higher‐silica magmas such as andesite or dacite.
Lei Liu, Robert P. Lowell
doaj   +1 more source

Disseminated, veinlet and vein Pb-Zn, Cu and Sb polymetallic mineralization in the GaleChah-Shurab mining district, Iranian East Magmatic Assemblage (IEMA)

Journal of Economic Geology, 2011
The Iranian East Magmatic Assemblage (IEMA) in the Central Lut region, hosted porphyry and vein-type polymetallic mineralization. The GaleChah-Shurab mining district is located in NW of the IEMA.
Behzad Mehrabi, Ebrahim Tale Fazel, Ali Nokhbatolfoghahaee   +2 more
doaj   +1 more source

MAJOR OXIDE, MINOR OXIDE, AND TRACE ELEMENT ANALYSIS OF ANDESITE AND DACITE ARTIFACTS FROM 5LA1211 AND 5LA1416, SOUTHERN COLORADO [PDF]

, 2017
The analysis here of volcanic rock artifacts indicates that all the samples were produced from intermediate andesite and dacite volcanic rocks. While the rocks are certainly intermediate volcanic rocks, the dacite artifacts do not match any known ...
Shackley, M. Steven
core   +1 more source

Rare Earth Element Potential in the Araí Rift Metavolcanic, Central Brazil: Gamma‐Ray Signatures, Mineralogy and Exploration Implications

Terra Nova, EarlyView.
ABSTRACT Although central Brazil hosts significant ion‐adsorption rare earth element (REE) deposits associated with A‐type granites, their coeval volcanic counterparts have been largely overlooked as exploration targets. This study demonstrates that acidic metavolcanic rocks of the Araí Group share strong radiometric, geochemical and mineralogical ...
Yuri Ribeiro, Nilson Francisquini Botelho, Valmir da Silva Souza, Diego Guilherme da Costa Gomes   +3 more
wiley   +1 more source

MAJOR, MINOR, AND TRACE ELEMENT COMPOSITION OF THE NEWMAN DOME DACITE, TAOS PLATEAU VOLCANIC FIELD, NORTHERN NEW MEXICO: GEOARCHAEOLOGICAL INTERPRETATIONS [PDF]

, 2021
The Newman Dome pyroxene dacite dome complex in the Taos Plateau Volcanic Field is a prominent stone tool raw material that was used for stone tool production for at least 11,000 years throughout northern New Mexico and southern Colorado, and perhaps ...
Shackley, M. Steven
core   +1 more source

Petrological and geochemical insights into the magma plumbing system of the Daliuchong dacite eruption, Tengchong Volcanic Field, SW China

Frontiers in Earth Science
The formation of highly evolved, dacitic magmas has been attributed to various processes, including crystal fractionation, partial melting of overlying crust, and/or assimilation of crustal material into an evolving magma chamber.
Chaoxing Su, Chaoxing Su, Meng Wang, Meng Wang, Diao Luo, Diao Luo, Tong Hou, Tong Hou, Tong Hou   +8 more
doaj   +1 more source