ADAIR PARK

GEOLOGICAL HISTORY OF ADAIR PARK SOUTH WEST ARIZONA

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Geology 101

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.

IV.
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

grainitic magma.

V. The fourth stop of this field trip was to look at the Red Beds.The red beds have been in the

area