ridge activity to increased mid ocean A ) decrease in the volume of ocean basies

Question

ridge activity to increased mid ocean A ) decrease in the volume of ocean basies owing t 8) wasing and waringt of continental ice caps C.) nonurnom rotation of the earth (wobbles). 01 sasquatch 10.1 First-onder transgressions appear to be nelated to 1.) The mud matrii, a hmestone it commonly "ferred to?the A ) allochemical ? ath chemical D.) biological 12.) This coated grain always contains a nucleus of quartz ar AJ oncolith. B.) micrite C.) oold. D) peloid 13.) A pisolith s: A.) a large oold B.) a large oncolith CJ a large peloid D.Ja large compound grain 14.) Black shales are black because of A.) high clay contents B.) organic matter C ) smokey quartz. 0.J a high illite to smectite ratio 15.) Gravel containing a high proportion of schist or limestone clasts (i.., resistance to weathering) would indicate A.) a long transport distance B.) a high energy depositional environment C.) nearness to the source. D.J deposition in a tropical climate 16.) The green color of mudstones comes from: A) the presence of hematite B.J the presence of goethite C.J the presence of limonite. D.J the absence of any of these minerals. 17.) A micrite in Folk's cdlassification system would be a in Dunham's system. A.) wackestone B.) mudstone C) packstone D.) grainstone. 18.) Which of the following implies deposition in an anoxic or even euxinic environment? A.) peloidal packstones. 8.) itharenite. C.) sulfidic black shales. D.) carbonate mudstone.

Explanation / Answer

Ans 10

a) decrease in the volume of ocean basins owing to increased mid-oceanic ridge activity.

Because first order transgressions and regressions are always related to either the breakup or formation of new supercontinents.

Ans 11

a) allochemical

because mud matrix is formed from materials derived from some other place than the deposition area.

Ans 12)

c. ooids

because the nucleus is a shell fragment, quartz grain or any other small fragment.

Ans 13)

d. a large compound grain

because it is formed by the coalescence of many pisoids.

Ans 14)

b. organic matter.

because it is the carbon from the decomposed organic matter that gives shale the black color.

Ans 15)

c. nearness to the source

because in any other condition the degree of weathering would be high and schist and limestone clasts would not survive,

Ans 16)

d. the absence of any of the color

Fe+2 the gives a green color to minerals and in absence of the other oxidized minerals

Ans 17)

b. mudstone

because mudstone contains less than 10% grains, just like the micrite which also has very few grains.

Ans 18)

c. sulfidic black shale

because deposition in anoxic condition only allows for the preservation of the organic matter, as in oxic condition all the organic matter is readily decomposed and lost.

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