Q 1: Write ( √ ) or ( × ) on the following
statements, and correct the "wrong" word(s):
(10 Marks)
1) Satin spar gypsum vein is formed during uplift diagenetic stage ( )
2) Packstone lacks mud and is grain supported. ( )
3) Ooids form in shallow, agitated water have concentric dolomite
structure ( )
4) The decrease in PCO2 in warm water favor carbonate
precipitation ( )
5) Polymodal, planar-e dolomite consists of one size of euhedral
dolomite crystals ( )
6) Alabastrine gypsum is a primary gypsum that formed in a sabkha
setting ( )
7) Meniscus cement indicates vadose diagenetic environment ( )
8) Columnar stromatolites are formed in intertidal environment ( )
9) Micrite envelope means the filling of algal pores by micrite ( )
10) Halite chevron is formed during shallow burial diagenesis ( )
Model
Answer of Question No. 1:
1) Satin spar gypsum vein is formed during uplift diagenetic stage (√)
2) Grainstone lacks mud and is grain supported. (×)
3) Ooids form in shallow, agitated water have concentric calcite
structure (×)
4) The decrease in PCO2 in warm water favor carbonate
precipitation (√)
5) Unimodal, planar-e dolomite consists of one size of
euhedral dolomite crystals (×)
6) Alabastrine gypsum is a secondary gypsum that formed during
uplift. (×)
7) Meniscus cement indicates vadose diagenetic environment (√)
8) Columnar stromatolites are formed in intertidal environment (√)
9) Micrite envelope means the filling of algal pores by micrite (√)
10) Halite chevron is a primary texture of halite (×)
Q 2:
Complete the following statements: (5
Marks)
1) Wackestone contains …………… lime mud, and is mud Supported.
(< 90 %, > 90 %, 100 %)
2)
……………………….. is composed of
low-Mg calcite that preserve the internal microstructure during diagenesis.
(Gastropodes, Corals, Cephalopodes)
3)
Planar stromatolites are
formed in …………………….….
(Protected tidal flats, subtidal zone,
supratidal zone)
4)
Enterolithic fold and chickenwire anhydrite
textures are formed by the coalescence of ………………………….
(nodules, rosettes, rafts)
5)
…………………….. are several
carbonate particles that are bound with organic matter.
(grapestones, intraclasts, peloids)
Model
Answer of Question No. 2:
1)
Corals are composed
of low-Mg calcite that preserve the internal microstructure during diagenesis.
2) Wackestone contains < 90 % lime mud, and is mud
Supported.
3)
Planar stromatolites are
formed in Protected tidal flats
4)
Enterolithic fold and chickenwire anhydrite
textures are formed by the coalescence of nodules
5)
Grapestones are
several carbonate particles that are bound with organic matter.
|