Origin of Taylor creek rhyolite magma, black Rangef New Mexico, based on Nd-Sr isotope studies

Cadi Reece, Joaquin Ruiz, Wendell A. Duffield, P. Jonathan Patchett

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Taylor Creek high-silica tin-bearing rhyolites are found in the northern Black Range of the Mogollon-Datil volcanic field in southwestern New Mexico, occurring near the stratigraphic top of a thick mid-Tertiary volcanic section. Initial tNd values for the high-silica rhyolite lavas range from -5.0 to -6.2, which are similar to those of the Garcia Camp tuff, a pyroclastic phase of the Taylor Creek Rhyolite. The older Kneeling Nun tuff, which crops out in the same area, also has a similar tNd( value, which indicates that the high-silica rhyolites and spatially associated silicic tuffs were derived from an isotopically similar source. Comparison with data from lower crustal xenoliths and data bearing on the isotopic compositions of the lower crust suggest that the melts were derived from 80 to 50 percent lower crustal sources. The Poverty Creek basaltic andesite and Bearwallow Mountain Formation andesite, stratigraphically below and above Taylor Creek Rhyolite, respectively, have more positive εNd1 values of -4.7 and -2.3, respectively, indicating a greater mantle component. Initial 87Sr/86Sr ratios vary from 0.7046 to 0.7131 for the Taylor Creek Rhyolite. There is a broad positive correlation between initial 87Sr/86Sr and Sr content and a negative correlation with Rb, Ta, and Th content. These variations may be explained by late-stage upper crustal assimilation of radiogenic and relatively Sr-rich wall and roof rocks. Whole-rock Sr contents of the least radiogenic rocks as low as 3 ppm indicate that little assimilation would be required to affect the original Sr isotopic signature of the Taylor Creek Rhyolite magma. The Nd isotopes, however, were not measurably affected by the upper crustal processes.

Original languageEnglish (US)
Pages (from-to)263-273
Number of pages11
JournalSpecial Paper of the Geological Society of America
Volume246
DOIs
StatePublished - 1990

Fingerprint

rhyolite
magma
isotope
silica
tuff
andesite
rock
tin
lower crust
roof
creek
poverty
isotopic composition
melt
mantle
crop
mountain

ASJC Scopus subject areas

  • Geology

Cite this

Origin of Taylor creek rhyolite magma, black Rangef New Mexico, based on Nd-Sr isotope studies. / Reece, Cadi; Ruiz, Joaquin; Duffield, Wendell A.; Patchett, P. Jonathan.

In: Special Paper of the Geological Society of America, Vol. 246, 1990, p. 263-273.

Research output: Contribution to journalArticle

@article{58a647c9dffa422e9476442acfcfaf15,
title = "Origin of Taylor creek rhyolite magma, black Rangef New Mexico, based on Nd-Sr isotope studies",
abstract = "Taylor Creek high-silica tin-bearing rhyolites are found in the northern Black Range of the Mogollon-Datil volcanic field in southwestern New Mexico, occurring near the stratigraphic top of a thick mid-Tertiary volcanic section. Initial tNd values for the high-silica rhyolite lavas range from -5.0 to -6.2, which are similar to those of the Garcia Camp tuff, a pyroclastic phase of the Taylor Creek Rhyolite. The older Kneeling Nun tuff, which crops out in the same area, also has a similar tNd( value, which indicates that the high-silica rhyolites and spatially associated silicic tuffs were derived from an isotopically similar source. Comparison with data from lower crustal xenoliths and data bearing on the isotopic compositions of the lower crust suggest that the melts were derived from 80 to 50 percent lower crustal sources. The Poverty Creek basaltic andesite and Bearwallow Mountain Formation andesite, stratigraphically below and above Taylor Creek Rhyolite, respectively, have more positive εNd1 values of -4.7 and -2.3, respectively, indicating a greater mantle component. Initial 87Sr/86Sr ratios vary from 0.7046 to 0.7131 for the Taylor Creek Rhyolite. There is a broad positive correlation between initial 87Sr/86Sr and Sr content and a negative correlation with Rb, Ta, and Th content. These variations may be explained by late-stage upper crustal assimilation of radiogenic and relatively Sr-rich wall and roof rocks. Whole-rock Sr contents of the least radiogenic rocks as low as 3 ppm indicate that little assimilation would be required to affect the original Sr isotopic signature of the Taylor Creek Rhyolite magma. The Nd isotopes, however, were not measurably affected by the upper crustal processes.",
author = "Cadi Reece and Joaquin Ruiz and Duffield, {Wendell A.} and Patchett, {P. Jonathan}",
year = "1990",
doi = "10.1130/SPE246-p263",
language = "English (US)",
volume = "246",
pages = "263--273",
journal = "Special Paper of the Geological Society of America",
issn = "0072-1077",
publisher = "Geological Society of America",

}

TY - JOUR

T1 - Origin of Taylor creek rhyolite magma, black Rangef New Mexico, based on Nd-Sr isotope studies

AU - Reece, Cadi

AU - Ruiz, Joaquin

AU - Duffield, Wendell A.

AU - Patchett, P. Jonathan

PY - 1990

Y1 - 1990

N2 - Taylor Creek high-silica tin-bearing rhyolites are found in the northern Black Range of the Mogollon-Datil volcanic field in southwestern New Mexico, occurring near the stratigraphic top of a thick mid-Tertiary volcanic section. Initial tNd values for the high-silica rhyolite lavas range from -5.0 to -6.2, which are similar to those of the Garcia Camp tuff, a pyroclastic phase of the Taylor Creek Rhyolite. The older Kneeling Nun tuff, which crops out in the same area, also has a similar tNd( value, which indicates that the high-silica rhyolites and spatially associated silicic tuffs were derived from an isotopically similar source. Comparison with data from lower crustal xenoliths and data bearing on the isotopic compositions of the lower crust suggest that the melts were derived from 80 to 50 percent lower crustal sources. The Poverty Creek basaltic andesite and Bearwallow Mountain Formation andesite, stratigraphically below and above Taylor Creek Rhyolite, respectively, have more positive εNd1 values of -4.7 and -2.3, respectively, indicating a greater mantle component. Initial 87Sr/86Sr ratios vary from 0.7046 to 0.7131 for the Taylor Creek Rhyolite. There is a broad positive correlation between initial 87Sr/86Sr and Sr content and a negative correlation with Rb, Ta, and Th content. These variations may be explained by late-stage upper crustal assimilation of radiogenic and relatively Sr-rich wall and roof rocks. Whole-rock Sr contents of the least radiogenic rocks as low as 3 ppm indicate that little assimilation would be required to affect the original Sr isotopic signature of the Taylor Creek Rhyolite magma. The Nd isotopes, however, were not measurably affected by the upper crustal processes.

AB - Taylor Creek high-silica tin-bearing rhyolites are found in the northern Black Range of the Mogollon-Datil volcanic field in southwestern New Mexico, occurring near the stratigraphic top of a thick mid-Tertiary volcanic section. Initial tNd values for the high-silica rhyolite lavas range from -5.0 to -6.2, which are similar to those of the Garcia Camp tuff, a pyroclastic phase of the Taylor Creek Rhyolite. The older Kneeling Nun tuff, which crops out in the same area, also has a similar tNd( value, which indicates that the high-silica rhyolites and spatially associated silicic tuffs were derived from an isotopically similar source. Comparison with data from lower crustal xenoliths and data bearing on the isotopic compositions of the lower crust suggest that the melts were derived from 80 to 50 percent lower crustal sources. The Poverty Creek basaltic andesite and Bearwallow Mountain Formation andesite, stratigraphically below and above Taylor Creek Rhyolite, respectively, have more positive εNd1 values of -4.7 and -2.3, respectively, indicating a greater mantle component. Initial 87Sr/86Sr ratios vary from 0.7046 to 0.7131 for the Taylor Creek Rhyolite. There is a broad positive correlation between initial 87Sr/86Sr and Sr content and a negative correlation with Rb, Ta, and Th content. These variations may be explained by late-stage upper crustal assimilation of radiogenic and relatively Sr-rich wall and roof rocks. Whole-rock Sr contents of the least radiogenic rocks as low as 3 ppm indicate that little assimilation would be required to affect the original Sr isotopic signature of the Taylor Creek Rhyolite magma. The Nd isotopes, however, were not measurably affected by the upper crustal processes.

UR - http://www.scopus.com/inward/record.url?scp=84879633559&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84879633559&partnerID=8YFLogxK

U2 - 10.1130/SPE246-p263

DO - 10.1130/SPE246-p263

M3 - Article

AN - SCOPUS:84879633559

VL - 246

SP - 263

EP - 273

JO - Special Paper of the Geological Society of America

JF - Special Paper of the Geological Society of America

SN - 0072-1077

ER -