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Francisco A. Paz-moreno - One of the best experts on this subject based on the ideXlab platform.
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Mid-Tertiary (25–21 Ma) Lamprophyres in NW Mexico derived from subduction-modified subcontinental lithospheric mantle in an extensional backarc environment following steepening of the Benioff zone
Tectonophysics, 2013Co-Authors: Alberto Orozco-garza, Jaroslav Dostal, J. Duncan Keppie, Francisco A. Paz-morenoAbstract:Abstract The mid-Tertiary Lamprophyre dike swarm (~ 8 km × 2.5 km in size) from Hermosillo (Sonora, NW Mexico) has calc–alkaline characteristics and includes NNW-striking, amphibole-phyric spessartite (~ 85% of the swarm) and NNE-striking, phlogopite-phyric kersantite. The 40 Ar/ 39 Ar geochronology of amphibole and phlogopite gives overlapping plateau ages ranging from 25 to 21 Ma. Although all the Lamprophyres are enriched in incompatible elements and display negative Nb–Ta and Ti anomalies on the primitive mantle-normalized plots, kersantite has higher K/Na, La/Yb, P, Ti and incompatible trace elements (e.g., Zr) compared to spessartite. The Lamprophyres have radiogenic Sr and Nd isotopic signatures ( 87 Sr/ 86 Sr ~ 0.7057–0.7065 and e Nd ~− 1 to − 2.3) suggesting derivation from the subcontinental lithospheric mantle that was previously modified by subduction-related fluids. This mantle is similar to that beneath the southern Grenvillian orogen, which has younger T DM ages than the 1.6–1.7 Ga T DM ages of the Caborca block. The lamprophyric magmas were generated at various mantle depths at the southwestern edge of North America. Intrusion of the Lamprophyres was synchronous with extension that produced normal faults and core complexes with WSW-vergence. Extension occurred immediately following steepening of the Benioff zone, during which the magmatic arc migrated from east to west of Hermosillo, and the Lamprophyres were intruded just behind the contemporaneous arc.
Francisco Pazmoreno - One of the best experts on this subject based on the ideXlab platform.
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mid tertiary 25 21 ma Lamprophyres in nw mexico derived from subduction modified subcontinental lithospheric mantle in an extensional backarc environment following steepening of the benioff zone
Tectonophysics, 2013Co-Authors: Alberto Orozcogarza, Jaroslav Dostal, Duncan J Keppie, Francisco PazmorenoAbstract:Abstract The mid-Tertiary Lamprophyre dike swarm (~ 8 km × 2.5 km in size) from Hermosillo (Sonora, NW Mexico) has calc–alkaline characteristics and includes NNW-striking, amphibole-phyric spessartite (~ 85% of the swarm) and NNE-striking, phlogopite-phyric kersantite. The 40 Ar/ 39 Ar geochronology of amphibole and phlogopite gives overlapping plateau ages ranging from 25 to 21 Ma. Although all the Lamprophyres are enriched in incompatible elements and display negative Nb–Ta and Ti anomalies on the primitive mantle-normalized plots, kersantite has higher K/Na, La/Yb, P, Ti and incompatible trace elements (e.g., Zr) compared to spessartite. The Lamprophyres have radiogenic Sr and Nd isotopic signatures ( 87 Sr/ 86 Sr ~ 0.7057–0.7065 and e Nd ~− 1 to − 2.3) suggesting derivation from the subcontinental lithospheric mantle that was previously modified by subduction-related fluids. This mantle is similar to that beneath the southern Grenvillian orogen, which has younger T DM ages than the 1.6–1.7 Ga T DM ages of the Caborca block. The lamprophyric magmas were generated at various mantle depths at the southwestern edge of North America. Intrusion of the Lamprophyres was synchronous with extension that produced normal faults and core complexes with WSW-vergence. Extension occurred immediately following steepening of the Benioff zone, during which the magmatic arc migrated from east to west of Hermosillo, and the Lamprophyres were intruded just behind the contemporaneous arc.
Jaroslav Dostal - One of the best experts on this subject based on the ideXlab platform.
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mid tertiary 25 21 ma Lamprophyres in nw mexico derived from subduction modified subcontinental lithospheric mantle in an extensional backarc environment following steepening of the benioff zone
Tectonophysics, 2013Co-Authors: Alberto Orozcogarza, Jaroslav Dostal, Duncan J Keppie, Francisco PazmorenoAbstract:Abstract The mid-Tertiary Lamprophyre dike swarm (~ 8 km × 2.5 km in size) from Hermosillo (Sonora, NW Mexico) has calc–alkaline characteristics and includes NNW-striking, amphibole-phyric spessartite (~ 85% of the swarm) and NNE-striking, phlogopite-phyric kersantite. The 40 Ar/ 39 Ar geochronology of amphibole and phlogopite gives overlapping plateau ages ranging from 25 to 21 Ma. Although all the Lamprophyres are enriched in incompatible elements and display negative Nb–Ta and Ti anomalies on the primitive mantle-normalized plots, kersantite has higher K/Na, La/Yb, P, Ti and incompatible trace elements (e.g., Zr) compared to spessartite. The Lamprophyres have radiogenic Sr and Nd isotopic signatures ( 87 Sr/ 86 Sr ~ 0.7057–0.7065 and e Nd ~− 1 to − 2.3) suggesting derivation from the subcontinental lithospheric mantle that was previously modified by subduction-related fluids. This mantle is similar to that beneath the southern Grenvillian orogen, which has younger T DM ages than the 1.6–1.7 Ga T DM ages of the Caborca block. The lamprophyric magmas were generated at various mantle depths at the southwestern edge of North America. Intrusion of the Lamprophyres was synchronous with extension that produced normal faults and core complexes with WSW-vergence. Extension occurred immediately following steepening of the Benioff zone, during which the magmatic arc migrated from east to west of Hermosillo, and the Lamprophyres were intruded just behind the contemporaneous arc.
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Mid-Tertiary (25–21 Ma) Lamprophyres in NW Mexico derived from subduction-modified subcontinental lithospheric mantle in an extensional backarc environment following steepening of the Benioff zone
Tectonophysics, 2013Co-Authors: Alberto Orozco-garza, Jaroslav Dostal, J. Duncan Keppie, Francisco A. Paz-morenoAbstract:Abstract The mid-Tertiary Lamprophyre dike swarm (~ 8 km × 2.5 km in size) from Hermosillo (Sonora, NW Mexico) has calc–alkaline characteristics and includes NNW-striking, amphibole-phyric spessartite (~ 85% of the swarm) and NNE-striking, phlogopite-phyric kersantite. The 40 Ar/ 39 Ar geochronology of amphibole and phlogopite gives overlapping plateau ages ranging from 25 to 21 Ma. Although all the Lamprophyres are enriched in incompatible elements and display negative Nb–Ta and Ti anomalies on the primitive mantle-normalized plots, kersantite has higher K/Na, La/Yb, P, Ti and incompatible trace elements (e.g., Zr) compared to spessartite. The Lamprophyres have radiogenic Sr and Nd isotopic signatures ( 87 Sr/ 86 Sr ~ 0.7057–0.7065 and e Nd ~− 1 to − 2.3) suggesting derivation from the subcontinental lithospheric mantle that was previously modified by subduction-related fluids. This mantle is similar to that beneath the southern Grenvillian orogen, which has younger T DM ages than the 1.6–1.7 Ga T DM ages of the Caborca block. The lamprophyric magmas were generated at various mantle depths at the southwestern edge of North America. Intrusion of the Lamprophyres was synchronous with extension that produced normal faults and core complexes with WSW-vergence. Extension occurred immediately following steepening of the Benioff zone, during which the magmatic arc migrated from east to west of Hermosillo, and the Lamprophyres were intruded just behind the contemporaneous arc.
Alberto Orozcogarza - One of the best experts on this subject based on the ideXlab platform.
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mid tertiary 25 21 ma Lamprophyres in nw mexico derived from subduction modified subcontinental lithospheric mantle in an extensional backarc environment following steepening of the benioff zone
Tectonophysics, 2013Co-Authors: Alberto Orozcogarza, Jaroslav Dostal, Duncan J Keppie, Francisco PazmorenoAbstract:Abstract The mid-Tertiary Lamprophyre dike swarm (~ 8 km × 2.5 km in size) from Hermosillo (Sonora, NW Mexico) has calc–alkaline characteristics and includes NNW-striking, amphibole-phyric spessartite (~ 85% of the swarm) and NNE-striking, phlogopite-phyric kersantite. The 40 Ar/ 39 Ar geochronology of amphibole and phlogopite gives overlapping plateau ages ranging from 25 to 21 Ma. Although all the Lamprophyres are enriched in incompatible elements and display negative Nb–Ta and Ti anomalies on the primitive mantle-normalized plots, kersantite has higher K/Na, La/Yb, P, Ti and incompatible trace elements (e.g., Zr) compared to spessartite. The Lamprophyres have radiogenic Sr and Nd isotopic signatures ( 87 Sr/ 86 Sr ~ 0.7057–0.7065 and e Nd ~− 1 to − 2.3) suggesting derivation from the subcontinental lithospheric mantle that was previously modified by subduction-related fluids. This mantle is similar to that beneath the southern Grenvillian orogen, which has younger T DM ages than the 1.6–1.7 Ga T DM ages of the Caborca block. The lamprophyric magmas were generated at various mantle depths at the southwestern edge of North America. Intrusion of the Lamprophyres was synchronous with extension that produced normal faults and core complexes with WSW-vergence. Extension occurred immediately following steepening of the Benioff zone, during which the magmatic arc migrated from east to west of Hermosillo, and the Lamprophyres were intruded just behind the contemporaneous arc.
Alberto Orozco-garza - One of the best experts on this subject based on the ideXlab platform.
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Mid-Tertiary (25–21 Ma) Lamprophyres in NW Mexico derived from subduction-modified subcontinental lithospheric mantle in an extensional backarc environment following steepening of the Benioff zone
Tectonophysics, 2013Co-Authors: Alberto Orozco-garza, Jaroslav Dostal, J. Duncan Keppie, Francisco A. Paz-morenoAbstract:Abstract The mid-Tertiary Lamprophyre dike swarm (~ 8 km × 2.5 km in size) from Hermosillo (Sonora, NW Mexico) has calc–alkaline characteristics and includes NNW-striking, amphibole-phyric spessartite (~ 85% of the swarm) and NNE-striking, phlogopite-phyric kersantite. The 40 Ar/ 39 Ar geochronology of amphibole and phlogopite gives overlapping plateau ages ranging from 25 to 21 Ma. Although all the Lamprophyres are enriched in incompatible elements and display negative Nb–Ta and Ti anomalies on the primitive mantle-normalized plots, kersantite has higher K/Na, La/Yb, P, Ti and incompatible trace elements (e.g., Zr) compared to spessartite. The Lamprophyres have radiogenic Sr and Nd isotopic signatures ( 87 Sr/ 86 Sr ~ 0.7057–0.7065 and e Nd ~− 1 to − 2.3) suggesting derivation from the subcontinental lithospheric mantle that was previously modified by subduction-related fluids. This mantle is similar to that beneath the southern Grenvillian orogen, which has younger T DM ages than the 1.6–1.7 Ga T DM ages of the Caborca block. The lamprophyric magmas were generated at various mantle depths at the southwestern edge of North America. Intrusion of the Lamprophyres was synchronous with extension that produced normal faults and core complexes with WSW-vergence. Extension occurred immediately following steepening of the Benioff zone, during which the magmatic arc migrated from east to west of Hermosillo, and the Lamprophyres were intruded just behind the contemporaneous arc.
