oceanography pg6.html
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<strong>Sediments of the Shelf </strong></SPAN ></P> <P style="margin-left:7px"> <SPAN style="color:#000000" >Most common is sand</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-top:3px; margin-left:7px"> <SPAN style="color:#000000" >2mm to 1/16mm</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-top:3px; margin-left:53px"> <SPAN style="color:#000000" >(a) </SPAN ><SPAN style=" font-weight:bold; color:#000000; text-decoration:underline" > Terregenous sand: </SPAN ><SPAN style="color:#000000" >caused by minerals on land particles carried to the</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:124px"> <SPAN style="color:#000000" >sea by streams ect.</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:55px"> <SPAN style="color:#000000" >Cape - quarky sand (most common)</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:55px"> <SPAN style="color:#000000" >Fieldspar</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:55px"> <SPAN style="color:#000000" >Meca</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-top:3px; margin-left:55px"> <SPAN style="color:#000000" >Homblande</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-top:12px; margin-left:55px"> <SPAN style="color:#000000" >(b) </SPAN ><SPAN style=" font-weight:bold; color:#000000; text-decoration:underline" >Calcarenite Sand: </SPAN ><SPAN style="color:#000000" >made up of shelf fragments - forms corals (CaCOa)</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:55px"> <SPAN style="color:#000000" >(c) </SPAN ><SPAN style=" font-weight:bold; color:#000000; text-decoration:underline" >Anthegenic Sand</SPAN ><SPAN style="color:#000000" > precipitation from sea H2O</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:124px"> <SPAN style="color:#000000" >Oolites (CaC03)</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:124px"> <SPAN style="color:#000000" >Glauconites (green)</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:124px"> <SPAN style="color:#000000" >Phosphate (brown)</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:8px"> <SPAN style="color:#000000" >Can usually see sand grains individually</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:8px"> <SPAN style="color:#000000" >Sand usually contains all three types. Sand is named from highest %(percent) present.</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-top:9px; margin-left:56px"> <SPAN style="color:#000000" >(2) Most common type of deposition sediment on the self is mud (or lutite)</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:103px"> <SPAN style="color:#000000" >Diameter of grain is less than 1/16</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:104px"> <SPAN style="color:#000000" >(a) Silt (1/16) mm to (1/256) mm</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:104px"> <SPAN style="color:#000000" >(b) Clay (less than 1/256 mm)</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:103px"> <SPAN style="color:#000000" >Difficult to see by eye the grains</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-top:9px; margin-left:104px"> <SPAN style="color:#000000" >Diagnostic Fracture</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:152px"> <SPAN style="color:#000000" >Dry species</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:152px"> <SPAN style="color:#000000" >If holds together = mud</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:152px"> <SPAN style="color:#000000" >If separates = sand</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:56px"> <SPAN style="color:#000000" >(3) Most Common type of sediment is gravel than (4 mm) long</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:104px"> <SPAN style="color:#000000" >(a) Gravel = less than 4 mm</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:104px"> <SPAN style="color:#000000" >(b) Pebble = 4-64 mm long</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-top:9px; margin-left:56px"> <SPAN style="color:#000000" >(4) Volcanic Fragments</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:104px"> <SPAN style="color:#000000" >(a) Bombs (larger deposit)</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:104px"> <SPAN style="color:#000000" >(b) Ash - (dust)</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> <P style="margin-left:104px"> <SPAN style="color:#000000" >(c) Pumice poris SID2 (glass)</SPAN ><SPAN style="font-size:12pt; color:#000000" > </SPAN ></P> </DIV> </DIV><br /> <FONT size="+1" color="#000000"></B>(5) Sea Weeds </P ><P align="justify" >(6) Mollusks </P ><P align="justify" >(7) Sponges </P ><P align="justify" >(8) Hard Rock bottom
Copyright 2014,
John Looney.
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rsadoo. (Aug 10, 2009). oceanography pg6.html. Retrieved Nov 06, 2014, from UMass Boston OpenCourseware Web site: http://ocw.umb.edu/environmental-earth-and-ocean-sciences/eeos-226-introductory-oceanography-e-g-sci/oceanography%20pg6.html.