Minerals, Free Full-Text
Por um escritor misterioso
Descrição
The mineral chemistry of chromite and silicate minerals in the Baixintan magmatic Ni-Cu sulfide deposit in the Northern Tianshan, southern Central Asian Orogenic Belt (CAOB) are reported here. Two types of chromite were identified in mafic-ultramafic rocks. Type I chromite occurs as inclusions encased in olivine and has a primary and magmatic origin and homogeneous composition with Cr# values (49–66). It is characterized by high Ti contents (0.33–1.52 wt%) and small quantities of ZnO (0–0.21 wt%), MnO (0.28–0.45 wt%), and NiO (0.06–0.24 wt%) contents. In contrast, type II chromite with interstitial phase and larger compositional variations has significantly higher TiO2 (up to 6.2 wt%) and FeOt contents (up to 69.3 wt%) and slightly lower Al2O3 (minimum 3.0 wt%) and MgO contents (minimum 0.53 wt%). It is considered to crystallize from a more evolved and fractionated melt and suffers from post-magmatic alteration, such as serpentinization and chloritization. The olivine has forsterite values (Fo) varying from 76.8 to 85.6. The parental magma is characterized by high temperature (1389 °C), high pressure (3.8 Gpa), and high Mg content (11.4 wt%) with oxidized (FMQ + 1.6) and hydrous nature based on compositions of primary chromite and olivine–chromite pairs. The intrusion originated from high-degree partial melting of depleted mantle that had been modified by crustal components and metasomatized by subduction fluid in a post-orogenic extensional setting. Two stages of sulfide segregation have been recognized. Early segregation led to the depletion of platinum group elements (PGE), and disseminated sulfide mineralization was the product of later segregation. The assimilation of crustal Si and S components played more important roles on sulfide segregation rather than fractional crystallization.
Vegan Multivitamins & Minerals, 180 Palm Oil Free Tablets
Field Guide to Rocks & Minerals by Frederick Pough 1960-Reading Vintage
poultry — natural way minerals
Mineral Fusion Cool Concealer Duo, 1 ct - Ralphs
60th Annual Gem, Mineral, Fossil & Jewelry Show - Visit Camarillo
Hamoud Aljamaan, PhD on LinkedIn: Graduate Admission Cycle The Information and Computer Science dept…
Menu of Minerals - Full Resources for Lesson by Geology with Kitty
As mineral prices boom, it is easier for crooked politicians to get elected
Rocks and Mineral Properties – FREE Activity
Now Foods Full Spectrum Minerals Iron-Free - Full Spectrum Minerals Capsules
bareMinerals Mineral Veil Finishing Powder Duo - Limited Edition
Nonmetallic Mineral Mining and Quarrying Industry, Discover, Track, Compare, Evaluate Companies on BizVibe
Demand the Supply: Ranking Consumer Electronics and Jewelry Retail Companies on their Efforts to Develop Conflict-Free Minerals Supply Chains from Congo - The Enough Project
de
por adulto (o preço varia de acordo com o tamanho do grupo)
