Oceanic Intraplate Magmatism Quiz
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Questions and Answers

Which type of rocks are silica-saturated with high Sr/Y and La/Yb ratios and low HFS concentrations?

  • Andesites
  • Adakites (correct)
  • Basalts
  • Boninites

What distinctive group of rocks dominate over andesites in backarc basins?

  • Adakites
  • MORB
  • Tholeiites
  • Backarc basin basalts (correct)

Which type of volcanic rocks contain phenocrysts of orthopyroxene, high magnesium groundmass, and notably lack plagioclase phenocrysts?

  • Boninites (correct)
  • Adakites
  • Andesites
  • Basalts

In the context of island arcs, what do young island arc systems low in intermediate volcanic rocks contain?

<p>Potassium arc tholeiite basalts (C)</p> Signup and view all the answers

What do Adakites have in terms of their rare chemical composition?

<p>Enriched LREE relative to HREE (A)</p> Signup and view all the answers

What is characteristic of backarc basin basalts (BAB) in comparison to MORB?

<p>Greater enrichment of H2O and alkali elements (D)</p> Signup and view all the answers

What type of magma is typically erupted by mantle hotspots beneath oceanic intraplate magmatism?

<p>Tholeiitic and alkalic basaltic lava (D)</p> Signup and view all the answers

How are seamounts defined geologically?

<p>Volcanically produced peaks below sea level (C)</p> Signup and view all the answers

What distinguishes Ocean island basalts (OIB) from Mid-Ocean Ridge Basalts (MORB)?

<p>OIB are more alkalic compared to MORB (A)</p> Signup and view all the answers

What is a possible explanation for the distinct chemistry of Ocean island basalts (OIB)?

<p>Entrainment of subducted sedimentary rocks in the source region (B)</p> Signup and view all the answers

Which type of landform constitutes the highest mountains on Earth, with a relief of approximately 10 km high?

<p>Hawaiian Islands (A)</p> Signup and view all the answers

What is the distinguishing characteristic of Oceanic plateaus compared to other oceanic landforms?

<p>They cover large areas of the ocean floor, ranging up to 10 million km^2 (A)</p> Signup and view all the answers

What type of basalts dominate the exposed volcanic rocks of the Hawaiian Islands?

<p>Olivine tholeiites (A)</p> Signup and view all the answers

Which oceanic plateau, located near the Solomon Islands, is considered the largest on Earth?

<p>Ontong – Java Plateau (D)</p> Signup and view all the answers

What type of volcanism is responsible for producing continental flood basalts?

<p>Continental intraplate magmatism (A)</p> Signup and view all the answers

Which type of volcanic deposits are associated with the Ontong – Java Plateau?

<p>Pillow basalts (C)</p> Signup and view all the answers

What is the approximate distance covered by the chain of seamounts and islands generated by the Hawaiian hotspot?

<p>5600 km (B)</p> Signup and view all the answers

Which type of rocks are examples of huge outpourings of continental flood basalts?

<p>Deccan traps of India, Karroo basalts of Africa, Siberian flood basalts of Russia (D)</p> Signup and view all the answers

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