Petrographic Description Of Granite

The thin sections were made by janwill petrograhics and the descriptions were completed by alana murphy.

Petrographic description of granite.

The classification of rocks is based on the information acquired during the petrographic analysis petrographic descriptions start with the field notes at the. A recent paper by prof. 4 2 1 barotiya group of rocks the barotiya group of rocks of mesoproterozoic age include an assemblage of metasediments dominantly mica schist along with conglometrate meta arkose and. In this chapter petrographic characteristics of these rocks are explained in detail.

Included in this section is a list of applicable standards and test methods for granite descriptions and standards for related construction components fabrication tolerances standard finish descriptions geological and petrographic descriptions of granite physical and mechanical property requirements as well as descriptions of common repairs and reinforcements. 2014 079 1 this sample is a plutonic rock dominated by anhedral feldspar 60 percent and a lesser amount of quartz 40 percent. These are photomicrographs very thin slices of rock seen in plane polarised light or between crossed polarisers when the colours seen are produced by interference of light. The general process for writing rock descriptions is to start off with a general description general colour grain size texture followed by identification of the minerals within the rock the mineral assemblage the name of the rock deduced from the assemblage and then finally your best guess on how and where it was formed.

Petrographic examinations provide identification of types and varieties of rocks present in potential aggregates. He found the gold in small scales rarely exceeding a. Petrographic description and petrochemical character of granitoid rocks in mudu area northern part of maungmagan dawei district myanmar myo zaw set1 and htay win1 search and discovery article 51267 2016 posted june 20 2016. National museum washington upon an occurrence of free gold in granite describes an interesting instance of the dissemination of this noble metal in the substance of granite of normal composition believed to be from sonora mexico.

Some common rock types as seen under the microscope. Rocks under the microscope. Merrill curator of the department of geology of the u. These descriptions with photographs are included in appendix i.

Granite and govindgarh granite. Three of the samples nl 32 nl 66 nl 74 all appear to be altered sedimentary rocks as.