Geochemistry of the Late Mesoproterozoic Mount Eve granite suite: Implications for Late to post-Ottawan tectonics in the New Jersey-Hudson Highlands

Matthew L. Gorring, Todd C. Estelle, Richard A. Volkert

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Abstract

The Mount Eve granite suite is a postorogenic, A-type granitoid suite that consists of several small plutonic bodies occurring in the northwestern New Jersey-Hudson Highlands. Mount Eve granite suite rocks are equigranular, medium- to coarsegrained, quartz monzonite to granite, consisting of quartz, microperthite, and oligoclase, with minor hornblende, biotite, and accessory zircon, apatite, titanite, magnetite, and ilmenomagnetite. Whole-rock analyses indicate that Mount Eve granite is metaluminous to slightly peraluminous (ASI or aluminum saturation index, A/CNK or Al2O3/(CaO + Na 2O + K2O) = 0.62 to 1.12) and has A-type compositional affinity defined by high K2O/Na2O (1.4 to 2.8), Ba/Sr (3 to 12), FeOt/(FeOt+MgO) (0.77 to 0.87), Ba (400 to 3000 ppm), Zr (200 to 1000 ppm), Y (30 to 130 ppm), Ta (2.5 to 6 ppm), total rare earth elements or REE (300 to 1000 ppm), low MgO (<1 wt%), Cr and Ni (both <5 ppm); and relatively low Sr (200 to 700 ppm). Variably negative Eu anomalies (Eu/Eu* = 0.13 to 0.72, where Eu/Eu* is the chondrite-normalized ratio of measured Eu divided by the hypothetical Eu concentration required to produce REE pattern with no Eu anomaly) and systematic decreases in Sr, Ba, Zr, Hf, Nb, and Ta, with constant total REE content and increasing Ce/Yb and SiO2 contents, suggest crystallization of feldspars + zircon + titanite ± apatite. Possible modes of origin include dry melting of charnockitic gneisses or Fe-rich mafic to intermediate diorites within the Mesoproterozoic basement. Two possible tectonic mechanisms for generation of Mount Eve granite include (1) residual thermal input from a major lithospheric delamination event during or immediately after peak Ottawan orogenesis (1090-1030 Ma) or (2) broad orogenic relaxation between peak Ottawan and a late (1020-1000 Ma) high-grade, right-lateral transpressional event.

Original languageEnglish
Pages (from-to)505-523
Number of pages19
JournalMemoir of the Geological Society of America
Volume197
DOIs
StatePublished - 1 Jan 2004

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granite
geochemistry
rare earth element
tectonics
titanite
apatite
zircon
quartz
anomaly
monzonite
delamination
diorite
granitoid
chondrite
hornblende
orogeny
rock
magnetite
biotite
crystallization

Keywords

  • A-type
  • Granite
  • Grenville
  • New Jersey Highlands
  • Tectonics

Cite this

@article{f410693afc49494d837d86df49b46021,
title = "Geochemistry of the Late Mesoproterozoic Mount Eve granite suite: Implications for Late to post-Ottawan tectonics in the New Jersey-Hudson Highlands",
abstract = "The Mount Eve granite suite is a postorogenic, A-type granitoid suite that consists of several small plutonic bodies occurring in the northwestern New Jersey-Hudson Highlands. Mount Eve granite suite rocks are equigranular, medium- to coarsegrained, quartz monzonite to granite, consisting of quartz, microperthite, and oligoclase, with minor hornblende, biotite, and accessory zircon, apatite, titanite, magnetite, and ilmenomagnetite. Whole-rock analyses indicate that Mount Eve granite is metaluminous to slightly peraluminous (ASI or aluminum saturation index, A/CNK or Al2O3/(CaO + Na 2O + K2O) = 0.62 to 1.12) and has A-type compositional affinity defined by high K2O/Na2O (1.4 to 2.8), Ba/Sr (3 to 12), FeOt/(FeOt+MgO) (0.77 to 0.87), Ba (400 to 3000 ppm), Zr (200 to 1000 ppm), Y (30 to 130 ppm), Ta (2.5 to 6 ppm), total rare earth elements or REE (300 to 1000 ppm), low MgO (<1 wt{\%}), Cr and Ni (both <5 ppm); and relatively low Sr (200 to 700 ppm). Variably negative Eu anomalies (Eu/Eu* = 0.13 to 0.72, where Eu/Eu* is the chondrite-normalized ratio of measured Eu divided by the hypothetical Eu concentration required to produce REE pattern with no Eu anomaly) and systematic decreases in Sr, Ba, Zr, Hf, Nb, and Ta, with constant total REE content and increasing Ce/Yb and SiO2 contents, suggest crystallization of feldspars + zircon + titanite ± apatite. Possible modes of origin include dry melting of charnockitic gneisses or Fe-rich mafic to intermediate diorites within the Mesoproterozoic basement. Two possible tectonic mechanisms for generation of Mount Eve granite include (1) residual thermal input from a major lithospheric delamination event during or immediately after peak Ottawan orogenesis (1090-1030 Ma) or (2) broad orogenic relaxation between peak Ottawan and a late (1020-1000 Ma) high-grade, right-lateral transpressional event.",
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T1 - Geochemistry of the Late Mesoproterozoic Mount Eve granite suite

T2 - Implications for Late to post-Ottawan tectonics in the New Jersey-Hudson Highlands

AU - Gorring, Matthew L.

AU - Estelle, Todd C.

AU - Volkert, Richard A.

PY - 2004/1/1

Y1 - 2004/1/1

N2 - The Mount Eve granite suite is a postorogenic, A-type granitoid suite that consists of several small plutonic bodies occurring in the northwestern New Jersey-Hudson Highlands. Mount Eve granite suite rocks are equigranular, medium- to coarsegrained, quartz monzonite to granite, consisting of quartz, microperthite, and oligoclase, with minor hornblende, biotite, and accessory zircon, apatite, titanite, magnetite, and ilmenomagnetite. Whole-rock analyses indicate that Mount Eve granite is metaluminous to slightly peraluminous (ASI or aluminum saturation index, A/CNK or Al2O3/(CaO + Na 2O + K2O) = 0.62 to 1.12) and has A-type compositional affinity defined by high K2O/Na2O (1.4 to 2.8), Ba/Sr (3 to 12), FeOt/(FeOt+MgO) (0.77 to 0.87), Ba (400 to 3000 ppm), Zr (200 to 1000 ppm), Y (30 to 130 ppm), Ta (2.5 to 6 ppm), total rare earth elements or REE (300 to 1000 ppm), low MgO (<1 wt%), Cr and Ni (both <5 ppm); and relatively low Sr (200 to 700 ppm). Variably negative Eu anomalies (Eu/Eu* = 0.13 to 0.72, where Eu/Eu* is the chondrite-normalized ratio of measured Eu divided by the hypothetical Eu concentration required to produce REE pattern with no Eu anomaly) and systematic decreases in Sr, Ba, Zr, Hf, Nb, and Ta, with constant total REE content and increasing Ce/Yb and SiO2 contents, suggest crystallization of feldspars + zircon + titanite ± apatite. Possible modes of origin include dry melting of charnockitic gneisses or Fe-rich mafic to intermediate diorites within the Mesoproterozoic basement. Two possible tectonic mechanisms for generation of Mount Eve granite include (1) residual thermal input from a major lithospheric delamination event during or immediately after peak Ottawan orogenesis (1090-1030 Ma) or (2) broad orogenic relaxation between peak Ottawan and a late (1020-1000 Ma) high-grade, right-lateral transpressional event.

AB - The Mount Eve granite suite is a postorogenic, A-type granitoid suite that consists of several small plutonic bodies occurring in the northwestern New Jersey-Hudson Highlands. Mount Eve granite suite rocks are equigranular, medium- to coarsegrained, quartz monzonite to granite, consisting of quartz, microperthite, and oligoclase, with minor hornblende, biotite, and accessory zircon, apatite, titanite, magnetite, and ilmenomagnetite. Whole-rock analyses indicate that Mount Eve granite is metaluminous to slightly peraluminous (ASI or aluminum saturation index, A/CNK or Al2O3/(CaO + Na 2O + K2O) = 0.62 to 1.12) and has A-type compositional affinity defined by high K2O/Na2O (1.4 to 2.8), Ba/Sr (3 to 12), FeOt/(FeOt+MgO) (0.77 to 0.87), Ba (400 to 3000 ppm), Zr (200 to 1000 ppm), Y (30 to 130 ppm), Ta (2.5 to 6 ppm), total rare earth elements or REE (300 to 1000 ppm), low MgO (<1 wt%), Cr and Ni (both <5 ppm); and relatively low Sr (200 to 700 ppm). Variably negative Eu anomalies (Eu/Eu* = 0.13 to 0.72, where Eu/Eu* is the chondrite-normalized ratio of measured Eu divided by the hypothetical Eu concentration required to produce REE pattern with no Eu anomaly) and systematic decreases in Sr, Ba, Zr, Hf, Nb, and Ta, with constant total REE content and increasing Ce/Yb and SiO2 contents, suggest crystallization of feldspars + zircon + titanite ± apatite. Possible modes of origin include dry melting of charnockitic gneisses or Fe-rich mafic to intermediate diorites within the Mesoproterozoic basement. Two possible tectonic mechanisms for generation of Mount Eve granite include (1) residual thermal input from a major lithospheric delamination event during or immediately after peak Ottawan orogenesis (1090-1030 Ma) or (2) broad orogenic relaxation between peak Ottawan and a late (1020-1000 Ma) high-grade, right-lateral transpressional event.

KW - A-type

KW - Granite

KW - Grenville

KW - New Jersey Highlands

KW - Tectonics

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