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IgPet (Igneous Petrology)

Number of questions: 71

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1) Which sentence is NOT correct?
  1. Sodic series is a subgroup of alkaline series
  2. Tholeiitic series is a subgroup of subalkaline series
  3. Potassic series is a subgroup of alkaline series
  4. Calk-alkaline series is a subgroup of alkaline series
Answers are locked. Please click here to buy them. 2) Which element is incompatible?
  1. Na
  2. Ca
  3. Fe
  4. Mg
Answers are locked. Please click here to buy them. 3) Which sentence is correct?
  1. Alkaline basalts and basanites are primitive because they have restite-rich nodules
  2. Tholeiitic basalts are primitive because they have restite-rich nodules
  3. Tholeiitic basalts are primitive because they don't have restite-rich nodules
  4. Calc-alkaline basalts are primitive because they have restite-rich nodules
Answers are locked. Please click here to buy them. 4) Which sentence is correct?
  1. Fast-spreading ridges have broader range of compositions and a larger proportion of evolved liquids
  2. Slow-spreading ridges have broader range of compositions
  3. Composition of MORB in both fast and slow-spreading ridges are the same
  4. MORB is completely uniform magmas
Answers are locked. Please click here to buy them. 5) What is the oldest age of oceanic crust?
  1. Archaen
  2. Precambrian
  3. Jurassic
  4. Eocene
Answers are locked. Please click here to buy them. 6) Composition of magma in hot spots that occur at or near mid-ocean ridges would be:
  1. hybrid of N-MORB and OIB
  2. OIT
  3. OIA
  4. hybrid of E-MORB and OIB
Answers are locked. Please click here to buy them. 7) In which type of granite can CPX be found?
  1. peralkaline
  2. calc-alkaline
  3. aluminous
  4. sodic
Answers are locked. Please click here to buy them. 8) Under normal conditions, forsterite forms earlier than fayalite because ...
  1. it is denser
  2. magma has more Mg
  3. Mg is smaller than Fe
  4. Fe is used by pyroxene and magnettite
Answers are locked. Please click here to buy them. 9) Wat type of basalt is predominant in ocean basins?
  1. Alkaline
  2. Tholeiitic
  3. Calc-alkaline
  4. Alkaline and tholeiitic
Answers are locked. Please click here to buy them. 10) The most important enigmatic magmatism is associated with:
  1. subduction zones
  2. oceanic rifts
  3. continental rifts
  4. hot spots
Answers are locked. Please click here to buy them. 11) Main differences between calc-alkaline and tholeiitic series?
  1. SiO2, H2O content
  2. MgO and volatiles
  3. Fe, Si and volatiles
  4. Evolution trend
Answers are locked. Please click here to buy them. 12) The main difference between tholeiitic and calc-alkaline rocks is:
  1. The presence of water in calc-alkaline/absence of water in tholeiite
  2. Higher SiO2 in C.a
  3. Lower K2O in T
  4. Higher incompatible elements in C.a
Answers are locked. Please click here to buy them. 13) Which granites are the result of extensive fractionation of MORBs?
  1. I-type
  2. S-type
  3. Hybrid
  4. Plagiogranites
Answers are locked. Please click here to buy them. 14) Bushveld and Skaergard are examples of ... , respectively.
  1. LMI, LMI
  2. LMI, continental rift intrusion
  3. continental rift intrusion, LMI
  4. both hot spot related intrusions
Answers are locked. Please click here to buy them. 15) Cu and Fe are respectively...
  1. siderophile, chalcophile
  2. chalcophile, siderophile
  3. chalcophile, chalcophile
  4. lithophile, chalcophile
Answers are locked. Please click here to buy them. 16) By small degree of partial melting the concentration of compatible and incompatible elements in the melt would be respectively:
  1. high, high if the melting materials are mafic
  2. high, low
  3. low, low if the melting materials are mafic
  4. low, high
Answers are locked. Please click here to buy them. 17) Which volcanic rocks do you expect to find in subduction zones?
  1. basalt, andesite
  2. andesite, rhyolite
  3. andesite, rhyodacite, rhyolite
  4. basalt, andesite, rhyolite
Answers are locked. Please click here to buy them. 18) If partition coefficient (D) for an element is <<1:
  1. That element will partition toward solid phase
  2. That element will partition toward liquid phase
  3. That element will not partition between liquid and solid phases
  4. That element would partition toward solid only in the early stage of crystallization
Answers are locked. Please click here to buy them. 19) What is the common chemical feature of continental rhyolites?
  1. metaluminous
  2. peralkaline
  3. peraluminous
  4. peralkaline and peraluminous
Answers are locked. Please click here to buy them. 20) Island arcs and active continental arcs are respectively the result of:
  1. ocean-ocean, ocean-continent subduction
  2. ocean-ocean, ocean-ocean subduction
  3. ocean-continent, ocean-ocean subduction
  4. ocean-ocean, continent-continent subduction
Answers are locked. Please click here to buy them. 21) Divergent plate boundaries are usually ...
  1. oceanic because specific gravity of oceanic crust is high
  2. continental because specific gravity of oceanic crust is low
  3. continental because specific gravity of oceanic crust is high
  4. oceanic because oceanic crust is thinner
Answers are locked. Please click here to buy them. 22) What is the main magma series in island arcs?
  1. Tholeiitic
  2. Calk-Alkaline
  3. Both above
  4. Alkaline
Answers are locked. Please click here to buy them. 23) Which mineral is not seen as phenos in tholeiitic basalt?
  1. Opx
  2. Cpx
  3. Plag
  4. Olivine
Answers are locked. Please click here to buy them. 24) Why in REE diagrams, are the concentrations of REE's normalized to a standard?
  1. To reduce the high values of some REE's
  2. To increase the proportions of some REE's
  3. To eliminate Oddo-Harkins effect
  4. To produce a smooth pattern
Answers are locked. Please click here to buy them. 25) What is the principal magma series in the oceanic island setting?
  1. alkaline
  2. tholeiitic
  3. calc-alkaline
  4. both alkaline and tholeiitic
Answers are locked. Please click here to buy them. 26) If partition coefficient (D) for an element is >>1:
  1. That element will partition toward solid phase
  2. That element will partition toward liquid phase
  3. That element will not partition between liquid and solid phases
  4. That element would partition toward solid only in the early stage of crystallization
Answers are locked. Please click here to buy them. 27) Opx-bearing granitoid is called:
  1. benmorite
  2. ankaramite
  3. charnockite
  4. mugearite
Answers are locked. Please click here to buy them. 28) By adding water, the position of the cotectic point shifts towards ... corner of the Olivine-Opx-Qtz system?
  1. Qtz
  2. Olivine
  3. Opx
Answers are locked. Please click here to buy them. 29) Negative Eu anomaly in REE diagram indicates that:
  1. Magma originated from the mantle
  2. Magma assimilated some crustal rocks during ascent
  3. Plag fractionated from the magma
  4. Eu was low in the source
Answers are locked. Please click here to buy them. 30) Which factor affects the behavior of Eu in the melt?
  1. fO2
  2. pH
  3. T
  4. P
Answers are locked. Please click here to buy them. 31) Nodules are restricted to:
  1. Alkaline basalt
  2. Tholeiitic basalt
  3. Calc-alkaline basalt
  4. Alkaline and tholeiitic basalt
Answers are locked. Please click here to buy them. 32) Which rock type is rare in island arc setting?
  1. Basaltic andesite
  2. Andesite
  3. Dacite
  4. Rhyolite
Answers are locked. Please click here to buy them. 33) Average vertical depth from the volcanic front to Beniof zone is ...
  1. 200 km
  2. 50 km
  3. 110 km
  4. 350 km
Answers are locked. Please click here to buy them. 34) In which type of granite would you find garnet, cordierite, sillimanite?
  1. alkaline
  2. calc-alkaline
  3. aluminous
  4. peralkaline
Answers are locked. Please click here to buy them. 35) Which element(s) has/have higher partition coefficient in garnet?
  1. V
  2. Ti
  3. Na
  4. HREE
Answers are locked. Please click here to buy them. 36) Part of arc between volcanic front and trench is called
  1. forearc
  2. back-arc
  3. volcanic front
  4. volcanic arc
Answers are locked. Please click here to buy them. 37) Which element has higher partition coefficient in olivine?
  1. Ni
  2. V
  3. Ti
  4. Na
Answers are locked. Please click here to buy them. 38) If partition coefficient (D) for an element is 1:
  1. That element will partition toward solid phase
  2. That element will partition toward liquid phase
  3. That element will not partition between liquid and solid phases
  4. That element would partition toward solid only in the early stage of crystallization
Answers are locked. Please click here to buy them. 39) Which sentence is NOT correct?
  1. Hot spots occur only in oceanic crust
  2. Volcanic hot spots create linear chains
  3. The source of magma in hot spots is the mantle
  4. Both alkaline and tholeiitic basalts are formed in hot spots
Answers are locked. Please click here to buy them. 40) The Plume Model is used to explain the formation of:
  1. OIB
  2. MORB
  3. Calc-alkaline andesite in subduction zones
  4. Alkaline and tholeiitic basalt formed in continental rifts
Answers are locked. Please click here to buy them. 41) In which tectonic setting is assimilation more common?
  1. ocean-ocean subduction zones
  2. oceanic rifts
  3. continental rifts
  4. hot spots
Answers are locked. Please click here to buy them. 42) In which tectonic setting do LMIs occur?
  1. oceanic rifts
  2. continental rifts
  3. hot spots
  4. any tectonic setting
Answers are locked. Please click here to buy them. 43) What is the source of T-MORB?
  1. Depleted mantle
  2. Enriched mantle
  3. Mixing of N-MORB and E-MORB magmas
  4. Mixing of enriched mantle magma with tonalitic basalt
Answers are locked. Please click here to buy them. 44) Plag and garnet affect, respectively:
  1. Sm, LREE
  2. HREE, Eu
  3. HREE, LREE
  4. Eu, HREE
Answers are locked. Please click here to buy them. 45) What is the effect of volatiles in the position of minima (lowest T point) in the Qtz-Ab-Or system?
  1. minima moves towards Ab-Or side
  2. ... towards Ab-Qtz side
  3. ... towards Qtz-Or side
Answers are locked. Please click here to buy them. 46) Continental basalts are commonly:
  1. alkaline
  2. tholeiitic
  3. calc-alkaline
  4. mixed
Answers are locked. Please click here to buy them. 47) Which choice is best for subalkaline basalts?
  1. They can be olivine-bearing
  2. They can be quartz-bearing
  3. They can be olivine-bearing or quartz-bearing, depending on which side of the plane of silica saturation they plot
  4. They cannot be quartz bearing
Answers are locked. Please click here to buy them. 48) The slope of LREE and HREE can be shown respectively by:
  1. La/Sm, Tb/Lu
  2. Tb/Lu, La/Sm
  3. La/Eu, Sm/Lu
  4. Sm/La, Eu/Lu
Answers are locked. Please click here to buy them. 49) Which ground preparation process is necessary for the formation of granitic rocks?
  1. Thickening of the crust
  2. Thermal disturbance
  3. Mantle effects
  4. All above
Answers are locked. Please click here to buy them. 50) Which mineral is not seen as phenos in Alkaline basalts?
  1. Opx
  2. Cpx
  3. Plag
  4. Olivine
Answers are locked. Please click here to buy them. 51) For peraluminous rocks, which is correct?
  1. Al2O3
  2. Al2O3>CaO+Na2O+K2O
  3. Al2O3Na2O+K2O
Answers are locked. Please click here to buy them. 52) Which sentence is correct?
  1. There is no basalt associated with stratovolcanoes
  2. Basalts are widespread but do not commonly erupt from stratos
  3. Pyroclastic materials are less common in stratos
  4. Stratos usually consist of predominantly dacitic lava
Answers are locked. Please click here to buy them. 53) What is the mantle's role in the production of granitic melts?
  1. supplying heat
  2. supplying material
  3. supplying heat and/or material
Answers are locked. Please click here to buy them. 54) In which type of granite is muscovite common?
  1. alkaline
  2. calc-alkaline
  3. aluminous
  4. peralkaline
Answers are locked. Please click here to buy them. 55) Which tectonic setting is the most intense area of magmatism?
  1. convergent margin
  2. mid-ocean rift
  3. intraplate setting
  4. continental rift
Answers are locked. Please click here to buy them. 56) What is the ultimate source of EM and HIMU?
  1. Depleted mantle
  2. Enriched mantle
  3. Ancient oceanic crust or sediments
  4. Assimilation of continental crust
Answers are locked. Please click here to buy them. 57) Granites formed under low pressure and dry conditions are called;
  1. subsolvus granites
  2. hypersolvus granites
  3. alkaline granites
  4. calc-alkaline granites
Answers are locked. Please click here to buy them. 58) Fractionation of which mineral should increase CaO/Al2O3 in the remaining melt?
  1. Plag
  2. CPX
  3. OPX
  4. Either plag or cpx depending on the magma series
Answers are locked. Please click here to buy them. 59) Granites formed under high pressure and high water content are called:
  1. subsolvus granites
  2. hypersolvus granites
  3. alkaline granites
  4. calc-alkaline granites
Answers are locked. Please click here to buy them. 60) Color of Amphibole in PPL can help us determine relative content of:
  1. OH
  2. Ni
  3. Ta
  4. Ti
Answers are locked. Please click here to buy them. 61) Volcanic rocks of the Island Arc show:
  1. Calc-alkaline trend
  2. Tholeiitic trend
  3. Alkaline trend
  4. Both calk-alkaline and tholeiitic trends
Answers are locked. Please click here to buy them. 62) Among REE's, which element has higher partition coefficient in plag?
  1. Lu
  2. La
  3. Sm
  4. Eu
Answers are locked. Please click here to buy them. 63) Which feature would be common in the Plag phenos of the andesitic rocks of subduction zones?
  1. corroded/embayed margins
  2. corona
  3. oscillatory zoning
  4. all of them
Answers are locked. Please click here to buy them. 64) Which sentence is NOT correct?
  1. All alkaline rocks show the same evolution trend
  2. All subalkaline rocks show the same evolution trend
Answers are locked. Please click here to buy them. 65) Which tectonic setting is more suitable for the formation of stratovolcanoes?
  1. subduction zones
  2. oceanic rifts
  3. continental rifts
  4. hot spots
Answers are locked. Please click here to buy them. 66) What is the age of the Large Igneous Provinces (LIPs)?
  1. Jurassic
  2. Eocene
  3. Cretaceous
  4. Archaen
Answers are locked. Please click here to buy them. 67) What type of basalt is predominant in island arcs and mid-ocean ridges, respectively?
  1. Alkaline, tholeiitic
  2. Tholeiitic, alkaline
  3. Calc-alkaline, tholeiitic
  4. Alkaline, calc-alkaline
Answers are locked. Please click here to buy them. 68) Positive Eu anomaly in REE diagram indicates that:
  1. Magma originated from the crustal source
  2. Magma assimilated some crustal rocks during ascent
  3. Eu was high in the source
  4. The was plag in the source
Answers are locked. Please click here to buy them. 69) Which sentence is correct?
  1. Volcanism is uniformly developed in island arc
  2. Volcanism is continuous along island arc axis
  3. Both compression and extension happen in a subduction zone
  4. Thickness of the continental crust remains unchanged during subduction
Answers are locked. Please click here to buy them. 70) Distribution (Partition) Coefficient is :
  1. CS/CL
  2. CL/CS
  3. CS/CS
  4. CL/CL
Answers are locked. Please click here to buy them. 71) Seamounts are the result of volcanic activity in:
  1. subduction zones
  2. oceanic rifts
  3. continental rifts
  4. hot spots
Answers are locked. Please click here to buy them.

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