GERM Reservoir Database
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GERM Database Search Results        
Reservoir Z Element Value Median SD Low High N Unit Info Reference Source(s)
Extreme Depleted D-MORB basalts   143Nd/144Nd 0.5134             Isotopic compositions of Depleted Mantle (DM) according to Neodymium isotopes in the 'Extreme' present day MORB.  'Extreme' merely refers to the fact that these isotopic compositions are from the most depleted end of the MORB field. These average MORB compositions are calculated using a more restrictive set of filters in order to assure that MORB representing low degree melts or melts which have experienced large amounts of fractional crystallization do not affect the average.  Though degree of melting or fractional crystallization do not effect the average isotopic composition, for incompatible trace element ratios to reflect source compositions only high degree melts should be used.  These will be known as 'D-MORB' for Depleted Mid-Ocean Ridge Basalts.  It is also noted that the values of the 'Average' and 'Extreme' D-MORB are very similar. Salters & Stracke 2004
Extreme Depleted D-MORB basalts   176Hf/177Hf 0.2836             Isotopic compositions of Depleted Mantle (DM) according to Hafnium isotopes in the 'Extreme' present day MORB.  'Extreme' merely refers to the fact that these isotopic compositions are from the most depleted end of the MORB field. These average MORB compositions are calculated using a more restrictive set of filters in order to assure that MORB representing low degree melts or melts which have experienced large amounts of fractional crystallization do not affect the average.  Though degree of melting or fractional crystallization do not effect the average isotopic composition, for incompatible trace element ratios to reflect source compositions only high degree melts should be used.  These will be known as 'D-MORB' for Depleted Mid-Ocean Ridge Basalts.  It is also noted that the values of the 'Average' and 'Extreme' D-MORB are very similar. Salters & Stracke 2004
Extreme Depleted D-MORB basalts   208Pb/204Pb 37.2             Isotopic compositions of Depleted Mantle (DM) according to Lead isotopes in the 'Extreme' present day MORB.  'Extreme' merely refers to the fact that these isotopic compositions are from the most depleted end of the MORB field. These average MORB compositions are calculated using a more restrictive set of filters in order to assure that MORB representing low degree melts or melts which have experienced large amounts of fractional crystallization do not affect the average.  Though degree of melting or fractional crystallization do not effect the average isotopic composition, for incompatible trace element ratios to reflect source compositions only high degree melts should be used.  These will be known as 'D-MORB' for Depleted Mid-Ocean Ridge Basalts.  It is also noted that the values of the 'Average' and 'Extreme' D-MORB are very similar. Salters & Stracke 2004
Extreme Depleted D-MORB basalts   87Sr/86Sr 0.702             Isotopic compositions of Depleted Mantle (DM) according to Strontium isotopes in the 'Extreme' present day MORB.  'Extreme' merely refers to the fact that these isotopic compositions are from the most depleted end of the MORB field. These average MORB compositions are calculated using a more restrictive set of filters in order to assure that MORB representing low degree melts or melts which have experienced large amounts of fractional crystallization do not affect the average.  Though degree of melting or fractional crystallization do not effect the average isotopic composition, for incompatible trace element ratios to reflect source compositions only high degree melts should be used.  These will be known as 'D-MORB' for Depleted Mid-Ocean Ridge Basalts.  It is also noted that the values of the 'Average' and 'Extreme' D-MORB are very similar. Salters & Stracke 2004
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