Results 21 to 30 of about 387,571 (165)

Origin of magnetite and apatite ores in the Esfordi magnetite-apatite ore deposit NE of Bafq, south Yazd: insights from mineralogy, geochemistry, microthermometry, O-H stable and U-Pb and Nd-Sm non-stable isotopes

Journal of Economic Geology, 2022
Petrographic and mineralogical data indicate the widespread presence of five generations of apatite, two generations of monazite with minor xenotime in the Esfordi deposit.
Kiamars Hosseini , Mohammad Ali Rajabzadeh   +1 more
doaj   +1 more source

Lithological and mineralogical structure of accumulative beach deposits of the Black Sea Danube-Dniester segment

Вісник Київського національного університету імені Тараса Шевченка. Серія Геологія, 2022
The investigations of accumulative-sand deposits of the Black Sea coastline on the area from the village Liman (Katranka spit) to the village Karolina Bugaz (Odessa region) have been carried out. The length of the coastal line in the study area is close
V. Nesterovskyi, M. Deiak, А. Tarnovetskyi   +2 more
doaj   +1 more source

Granitoids of Sanandaj-Sirjan Zone that are concurrent with Cimmerian Orogeny (178-160 Ma) belong to ilmenite series (S-type): investigation of reason for lacking the porphyry tin mineralization

Journal of Economic Geology, 2021
ntroduction The granitic rocks are divided into magnetite and ilmenite series (Ishihara 1977), coinciding spatially with the I-type (εNdi0; (87Sr/86Sr)i~0.704-0.706) and S-type granites (εNdi0.707, N-MORB normalized patterns with enrichment in Low- and ...
Mohammad Hassan Karimpour, Nargess Shirdashtzadeh, Martiya Sadeghi   +2 more
doaj   +1 more source

Low-temperature magnetic properties of magnetite [PDF]

, 2000
Although several studies have recommended removal of secondary components of magnetic remanence by zero-field cycling from room temperature to a temperature much lower than the low temperature transition for magnetite (about 120 K), the method has not ...
Wyn Williams, James G. King, King, James G., Williams, Wyn; id_orcid   +3 more
core   +1 more source

Ilmenite Alteration and Its Adsorption and Catalytic Reduction in U Enrichment in Sandstone-Hosted U Deposits from the Northern Ordos Basin, North China

, 2022
Detrital ilmenite and its altered minerals are common in sandstone-hosted U deposits in the northern Ordos Basin, north China. Petrographic observation, SEM-EDS, EMPA, and LA-MC-ICP-MS were utilized to characterize the spatial relationship between ...
De-Ru Xu, Bo Ding, Hong-Xu Liu, Lin-Fei Qiu, Chuang Zhang   +4 more
core   +1 more source

Ab initio study of the elastic behavior of MgSiO3 ilmenite at high pressure [PDF]

, 1999
We investigate the athermal high pressure behavior of the elastic properties of MgSiO3 ilmenite up to 30 GPa using the ab initio pseudopotential method. Our results at zero pressure are in good agreement with single-crystal elasticity measurements.
Stixrude, Lars, Wentzcovitch, Renata M., Da Silva, CRS, Karki, Bijaya B., Karki, BB, Wentzcovitch, RM, Da Silva, Cesar R.S., Stixrude, L   +7 more
core   +1 more source

METAMORPHOSED SULFIDE ORES FROM THE LUCHISTOE CU OCCURRENCE, SOUTH URALS [PDF]

Минералогия, 2015
Sulfide ores from the Luchistoe copper occurrence, which are metamorphosed under thermal influence of the Mazar granitic intrusion, are similar in mineralogy and petrography with metamorphosed ores from the VHMS and copper scarn deposits of the Urals ...
N.P. Safina, L.Ya. Kabanova, D.A. Kuznetsov, I.A. Blinov   +3 more
doaj  

Magnetite and ilmenite from some Finnish rocks [PDF]

, 1972
Coexisting accessory magnetite and ilmenite -were separated and chemically analysed from five Finnish Precambrian rocks: anorogenic olivine diabase and gabbroanorthosite as well as three metamorphosed Svecofennian quartz diorites.
P. Ojanperä, I. Haapala
core   +1 more source

Natural Radioactivity and Radiological Implications of Stream Sediments at Wadi Aidib Area, South Eastern Desert, Egypt

Iraqi Geological Journal, 2022
Wadi Aidib lies at the extreme southern part of the Eastern Desert, Egypt, between 22o15'- 22o21' N and Longitudes 36o20'-36o30' E. Landsat ETM+ false color composite image (bands 3, 2, 1) was used for regional discrimination for different rock ...
Moustafa B. Bayoumi, Osama A. Ebyan, Abdelhay M. El Shafey, Mohamed Hassan   +3 more
doaj   +1 more source

Characterization of Gold of the Murcielago Fluvial Placer (Central Honduras) and Its Possible Primary Sources

Geosciences, 2023
The Murcielago gold placer is located in the Lepaguare Valley, Olancho Department (Central Honduras). The placer mineralogy includes silicates (quartz, garnets, amphibole, Ca-pyroxene, micas, epidote, and tourmaline); calcite; and in the heavy fraction ...
Sabrina Nazzareni, Simona Alunno, Federica Zaccarini, Michele Mattioli, Alessandro Murroni, Alessandro Di Michele, Alberto Renzulli   +6 more
doaj   +1 more source