in the study area was investigated with ore microscopy studies as well as XRD, Raman spectroscopy, and microprobe analysis for pyrolusite.
(1942a) The mineralogy and paragenesis
of the variscite nodules from near Fairfield, Utah--Part 1.
It aims at providing basic knowledge on ore microscopy, so that the participants could be able to identify the most common ore mineral and study their texture and paragenesis
. The course deals in preparation of polished ore sections, principals of reflected light polarizing microscope, optical properties of ore minerals, common ore texture and their significance, and paragenetic studies.
Papers cover such topics as the Himalayan Model of subduction and collision, microdiamonds in Kazakhstan dolomite marble, anew metamorphic terrane in China, fluid infusion from drill cores, mantle replacement, dating of zircon, tectonic division in a pressure region, low-grade metamorphic rocks in an orogenic belt, isotropic compositions of carbonaceous material, subduction-related Jurassic plutonism, mafic and utramafic bodies in Japan, ophiolite in the Coast Range of California, evidence from fluid mobility in the Franciscan Complex, and evidence of magma paragenesis
gained from garnets.
If the protolith is siliceous carbonate, then calc-silicate minerals will be part of the mineral paragenesis
. Figure 2 illustrates the stability field of periclase, brucite and some of the other mineral assemblages that are expected at 1.5 kbar in silicious dolomite, a geological setting that can be approximated by a CaO-MgO-Si[O.sub.2]-[H.sub.2]O-C[O.sub.2] system.
The peak paragenesis
is believed to have been formed by partial melting reactions.
The mineralization appears to be associated with the fault zones with NE-SW strikes, and it exhibits a mineral paragenesis
In addition, both megacryst and ecologite paragenesis
garnets are well-represented in this kimberlite.
Its geological value is accounted for by its location in the Andes Cordillera where, due to its intense and recent orogenesis, deposits with large reserves, better grades and attractive paragenesis
Corbela, "Reactive transport modelling of ore mineral zoning and the paragenesis
of copper sulfides in sediment-hosted stratiform ore deposits, the Katanga Copper-belt (DRC)," Geologica Belgica, vol.