Geological History Of Adair Park South West Arizona

I. On Saturday, November 16, 2013, our Geology class went to Adair jeting lot Yuma Arizona on our adventure of a lifetime. The point of the trip was to watch real life examples of some of the snubgs that we have studied over the railway line of this semester. Actually being able to satisfy examples of such things as cross-bedding dams, uncon reboundities, folds faults and respective(a) aqueous run more or lesss. II. The first stop of the dramaturgy trip was to olfactory sensation at the Gneiss. The Gneiss has been around for just about 1. 6 bilion years. The probable type of contact metamorphism The oecumenical term for all such incorporated bodies is inclusions.Xenoliths atomic number 18 usually reconstituted through the processes of contact metamorphism, in which heat and fluids cause mineralogic and chemical changes in the stir rock of the xenolith a study of these changes can give information on the temperature and composition of the magmatic body. The mineral co mpostition that what we could see were Biotite, Muscovite and quartz. The separate significant feature the dikes(white) that was younger in the cross cuting through the Gneiss. III. The second stop of this depicted object trip was to serve at the Granite. The Granite and has been here for around 1. 4 one million million million 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 tierce 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 be 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 bea around 20-30 million years old.The steep cliffs of Adair Park and the surroundi ng lowlands offer breathtaking exposures of the lower subunitthe red conglomerates/breccias and gypsum. These red-bed deposits are composed of interbedded breccias, conglomerates, sandstones. In other areas it commonly forms a medium thin, dirty, discontinous bed up to 10 60 cm thin beds are usually well sorted, clast-supported, commonly ordinarily graded.The conglomerates are also thinly bedded and clast-supported, but are fairly well-sorted to poorly sorted and contain an abundance of angulate to well-rounded quartz, feldspar,calcite, granite and gneiss. metamorphic, and mafic volcanic clasts. The conglomerates can generally be distingushed from the breccias by their well-bedded nature. VI. The fifth stop of this field trip was to look at the Green/Tan Beds. The parking area and false topaz beds have been in the area around 20-30 million years old. These jet plane and tan bed deposits are compsed of gypum. On other areias it commony forms a thin disconintuous bed up to 10 c m thin are usually well sorted , clast-supported commonly normally well sorted, commonly normally graded.The gypsum are also thinly bedded and poorly sorted, but are mederatelywell-sorted to poorly sorted and contain an abundance of angular calcite, and hornblend. See foresee 2. VII. The sixth stop of this field trip was to look at the diobase dike. This diobase dike have been here less than 10 million years. The diobase dike are composed of a metamorphic- plutonic basement that is overlain by middle third sedimentary and volcanic rocks.. Much of thesedimentary sequence was deposited before the onset of volcanism and tectonism, although the topical anesthetic presence of clasts of volcanic origin suggests at least some synchroneity.The sedimentary rocks are commonly in low-angle normal fault contactwith rudimentary basement rocks. Gentle folding and warping, along with poorly developed cleavage, are generally present. Tertiary volcanic rocks are dominantly intermediate to mafic f lows with lesser amounts of pyroclastic material. Olivine, augmite and green poroxy is largely altered. See Figure 1. VIII. The s crimsonth stop of this trip was to look at the Terrace Gravels. The terrace gravels have been around for around cc,000 years. An angular unconfomity of Adar formation with the overlying terrace gravels. In some place of Adair park the terrace gravels can be as much as 200 feet thick.The were mountains that used to be in the area but with water eating away the mountains dispareared. Bajada, ( Spanish slope ) is a broad slope of debris pervade along the lower slopes of mountains by descending streams, usually found in arid or semiarid climates the term was adopted because of its use in the U. S. Southwest. A bajada is often formed by the coalescing of some(prenominal) alluvial fans. such coalescent fans are often mistaken for erosional landforms known as pediments. The repeated modify of a debouching stream from one side of a fan to the other spreads th e sediment widely and almostuniformly.As the sediment eventually grows together, the slope whitethorn extend outward from the mountain front to a distance of several kilometres. A bajada is usually composed of gravelly alluvium and may even have large boulders interbedded in it. XL. Inconclusion the field trip really helped me deal some of the stuff that we studied during this course being able to see some real examples and havintg them explained to us. This has been fun class any your are peachy professor. I appreciate your sense of humor during the class and your attempt to suffer learning fun.