A well-sorted sandstone composed almost entirely of well-rounded quartz, with sp

Question

A well-sorted sandstone composed almost entirely of well-rounded quartz, with sparse clasts of zircon, apatite, hematite, and goethite is deposited in a river delta in the Gulf of Mexico. What can be inferred about the history of the rock? Select one: a. The transport mechanism for the sediment was a turbidity current that carried sediment from deep waters in the Gulf of Mexico. b. The source of sediment was predominantly composed of quartz, and located near the basin. c. The assemblage of trace minerals tells us that the source area was characterized by a quartzofeldspathic gneiss with plenty of hematite. d. The sedimentary clasts were transported over a long distance from their source Which one comes first in the history of a detrital sedimentary rock? Select one: a. Source-rock erosion b. Diagenesis c. Lithification d. Sediment transport

Explanation / Answer

d

as the rock is well sorted it indicates that the sediments are transported for longer distances

source rock erosion

source rock erosion then transportation and deposition then lithification and then diagenisis

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