2013 Novermber 20
I. On Saturday, November 16, 2013, our Geology class went to Adair Park Yuma
Arizona on our adventure of a lifetime. The point of the trip was to view real life
examples of some of the things that we have studied over the course of this semester.
Actually being able to see examples of such things as cross-bedding dikes,
unconformities, folds faults and various sedimentary features.
II. The first stop of the field trip was to look at the Gneiss. The Gneiss has been around
for about 1.6 bilion years. The probable type of contact metamorphism The general
term for all such incorporated bodies is inclusions. Xenoliths are usually reconstituted
through the processes of contact metamorphism, in which heat and fluids cause
mineralogic and chemical changes in the parent rock of the xenolith; a study of these
changes can give information on the temperature and composition of the magmatic
body. The mineral compostition that what we could see were Biotite, Muscovite and
quartz. The other significant feature the dikes(white) that was younger in the cross
cuting through the Gneiss.
III. The second stop of this field trip was to look at the Granite.The Granite and has been
here for around 1.4 billion years. The type of rock Granite which is Igneous with a
funeratic course grined, with grains visible on fresh surface. The type of mineral
composition in the Granite is Orthoclase, Quartz and Biotite.
The third stop of this field trip was to look at the Pegimatite. The Pegmatite has been
around for about 73 million years. Pegmatite is very coarse granite. Pematieites are
thought to form from the bolatile low-denisity fluids that crystallize last from the
V. The fourth stop of this field trip was to look at the Red Beds.The red beds have been in the