Rocs Weathering and eerprateten READING THE RECORD IN THE INTERPRETATION GUIDE n

Question

Rocs Weathering and eerprateten READING THE RECORD IN THE INTERPRETATION GUIDE nonal boin and tome wtatheing and erod the difference the hiin. Remember weathering imaluioun of osk ty hybolysis distilation osidationiat eing, or brene than) and ersion (innspevsorioe of partic les) Source Area Lithology Dess opiiic of a sant e sadtoae the particular types of minerals by qartale 37) Remenher that quartz sandstone or guurte arenite is d ithology (or rock types) in the on the souroe area Table 3.7% grains, arkose is dominased by teldspar grains (usualy or praywaxke is dominated by rock tragment grains. AREA LITHOLOGY TABLE 3.7 INTERPRETING THE SOURCE AREA LITHOLOG Composition of Grains in the Rock Types in the Se s in the Sediment Sourcs Area Granite, gneiss, or older sand- sandstones Granite or gneiss Quartz sand grains stones that contain quartz (recycled Feldspar sand grains Rock fragment sand grains Fine-grained rocks, such as shale, andesite, chert, and possibly schist slate, phyllite, basalt, rhyolite As asted earlier,the particular suitle of heary minerals present in sand l in a lot about the source ares fitholopy Paleoclimate Paleoclimate refers to the climabe that existed in the source area when rok weathering to peodace soliment. We are particularly concerned with wethering and processes here. Remiember that in kumid climates, feldspar wea to da hydrolysis Other minerals, sach as olivine, pyroxenc, and amphibole o wa to clay with associated inon oxides Table 3.8 shows the likely paleochinle when certain minerals or types of rnck fragments are present in sand andase lf rock fragments are penent in your sand·st helps to know whu lthekgse are If you cannot identity them, a good compromise anower is temp Tectonic Activity in the Source Area We are husically clanilying soctonic activity here as active or pasive ( For a good model, consider the west coast of the Unitod States as tecton seep slopes, s c to the sea, sigticant number of earhqua uplift, ad occasinal volcanic activity On the other hand, consider the the United Sues to he lecomically passive hroud, fat coastal plain, few gakes laie or so uplih, and so volcanic activiny the eat

Explanation / Answer

1. Quartz sandstone that is well sorted and well rounded-

2. Arkose that is poorly sorted and poorly rounded –

3. Quartz sandstone that is angular, muddy, and poorly sorted-

4. Arkose that is well sorted and well rounded –

5. Litharenite that is poorly sorted, has no mud, and has angular grains-

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