Rb-Sr and U-Pb geochronology and distribution of rock types in the Precambrian basement of Missouri and Kansas

Bickford, M. E.; Harrower, K. L.; Hoppe, W. J.; Nelson, Bruce K.; Nusbaum, Robert L.; Thomas, John Jenks

doi:10.1130/0016-7606(1981)92<323:raugad>2.0.co;2

Cited by 70 publications

(20 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The magnetic anomaly outlines the southeast Kansas igneous intrusive complex. A granite penetrated in the eastern well has been dated at 1348 Ma (U-Pb) (Bickford et al 1981) indicating that this body is part of the WGRP.…”

Section: The Midcontinent Rift In Kansas Nebraska and Oklahomamentioning

confidence: 98%

See 1 more Smart Citation

Possible extension of the Midcontinent Rift in west Texas and eastern New Mexico

Adams¹,

Keller²

1994

Can. J. Earth Sci.

View full text Add to dashboard Cite

The Midcontinent Rift System forms one of the most prominent gravity features in North America. The recognized geophysical anomaly extends in an arc from southern Oklahoma to Lake Superior and then into southern Michigan. The Midcontinent Rift System was active between 1185–1010 Ma, as indicated in the Lake Superior region by age determinations on intrusive igneous rocks. We suggest that the period of formation of the Midcontinent Rift was also a time of extensive igneous activity in Texas and New Mexico. This activity is represented by intrusions beneath the Central basin platform (Texas and New Mexico), intrusions which crop out at the Pajarito Mountain in the Sacramento Mountains (New Mexico), a basaltic debris flow in the Franklin Mountains (Texas), basalt flows at Van Horn (Texas), and the Crosbyton geophysical anomaly (east of Lubbock, Texas). These bodies and other bodies located by geophysical anomalies and wells drilled into mafic Precambrian rocks may be related to the Midcontinent Rift System. Alternatively this magmatism could be related to Grenville age tectonics in Texas. The mafic igneous rocks in this area form a 530 km diameter Middle Proterozoic igneous province, which formed between 1070 and 1220 Ma. Comparison of the Midcontinent Rift System and its extensions proposed here with the Mesozoic and Cenozoic African rift systems indicates that these features are of comparable scale and complexity.

show abstract

Section: The Midcontinent Rift In Kansas Nebraska and Oklahomamentioning

confidence: 98%

“…3 and 4). Felsic rocks in this area have been dated at 1748 -1409 Ma (U -Pb) (Bickford et al 1981). This body could be associated with the Midcontinent Rift or the Central Plains orogeny .…”

Section: The Midcontinent Rift In Kansas Nebraska and Oklahomamentioning

confidence: 98%

Possible extension of the Midcontinent Rift in west Texas and eastern New Mexico

Adams¹,

Keller²

1994

Can. J. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…These provinces are the Eastern Granite-Rhyolite (EGR) province and the Southern Granite-Rhyolite (SGR) province, with crystallization ages of~1,470 and 1,370 Ma, respectively (Bickford and Lewis 1979;Bickford et al 1981; Thomas et al 1984;Bickford and Van Schmus 1985;Van Schmus et al 1987;Van Schmus et al 1993a). These provinces along with other major crustal features of the mid-continent region are shown in Fig.…”

Section: Introductionmentioning

confidence: 98%

Isotopic connections between basement rocks exposed in the St. Francois Mountains and the Arbuckle Mountains, southern mid-continent, North America

Rohs

Schmus

2006

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

Two distinct crustal provinces have been identified in the southern mid-continent based on U-Pb crystallization ages. Both contain large volumes of undeformed granite and rhyolite, with minor amounts of metamorphic rock and mafic intrusions. The Eastern Granite-Rhyolite province is characterized by felsic rocks with crystallization ages of 1,470 ± 30 Ma and exposures are restricted to the St. Francois Mountains in southeastern Missouri. Similarly, the Southern Granite-Rhyolite (SGR) province is characterized by felsic units with ages of 1,370 ± 30 Ma with primary exposures in the eastern Arbuckle Mountains of southern Oklahoma. Within the SGR province three magmatic pulses can be identified starting at 1,400, 1,370, and 1,340 Ma. Although the crystallization ages are different, the Sm-Nd isotopic signatures are similar for the units exposed in these areas as well as the buried basement in between. Depleted mantle model ages for rocks within the Arbuckle Mountains range from 1,530 to 1,430 Ma with e Nd (t) values of +3.2 to +4.1 while units of the St. Francois Mountains range from 1,550 to 1,430 Ma and +4.5 to +4.7. Comparison of Sm-Nd isotopic data also indicate similarities between the 147 Sm/ 144 Nd and 143 Nd/ 144 Nd ratios for the rock units in these areas suggesting a common source.

show abstract

“…A general summary of U-Pb and Sm-Nd results for the region is in Table 1. This includes U-Pb ages of zircons that have been sep arated from drill core or drill cuttings (Bickford et al, 1981a;Steeples and Bickford, 1981;Van Schmus and Bickford, 1981;Thomas et al, 1984;Van Schmus et al, 1987; this volume), as well as U-Pb ages of zircons from outcrop samples (Bickford and Mose, 1975;Bickford and Lewis, 1979;this volume). Sm-Nd Bickford and Lewis, 1979;2 = Bickford and Mose, 1975 (recalculated); 3 = Bickford et al, 1981a;4 = Hoppe et al, 1983;5 = Nelson and DePaolo, 1985;6 = Steeples and Bickford, 1981;7 = Thomas et al, 1984;8 = Van Schmus et al, 1987;9 =Turekand Robinson, 1982. § §Analyses from different portions of the drill core; differences mainly due to variations in mineral abundances.…”

Section: Introductionmentioning

confidence: 99%

Proterozoic geology of the east-central Midcontinent basement

Schmus¹,

Bickford²,

Turek³

1996

Basement and Basins of Eastern North America

Self Cite

123

149

View full text Add to dashboard Cite

The Precambrian basement beneath much of Illinois, Michigan, southwestern Ontario, Indiana, western Ohio, western Kentucky, and southeastern Missouri (including exposures in the S t Francois Mountains) is known as the eastern granite-rhyolite prov ince. This crust is characterized by undeformed and mostly unmetamorphosed highsilica rhyolite to dacite with epizonal granite of equivalent composition having zircon UPb ages of 1,470 ± 30 Ma. The Precambrian subcrop beneath parts of southwestern Mis souri, southern Kansas, northern Arkansas, most of Oklahoma (including small areas of outcrop), and the panhandle of Texas is known as the southern granite-rhyolite province. This crust is also characterized by undeformed and mostly unmetamorphosed high-silica rhyolite to dacite with epizonal granite, but zircon U-Pb ages from this province are about 100 m.y. younger, 1,370 ± 30 Ma. We have obtained additional zircon U-Pb ages and whole-rock Sm-Nd data for many drill-hole samples and a few outcrop samples from these provinces to (1) define their geographic limits more accurately, and (2) use them as a means of defining the age of the crust which presumably underlies these two provinces and from which the granite and rhyolite magmas were derived.These granite-rhyolite provinces were previously thought to have formed from anatectic melting of preexisting Paleoproterozoic crust, which is a southward and eastward extension of the 1,600 to 1,800 Ma Central Plains orogen. However, recent Sm-Nd stud ies, including additional data reported here, indicate that some of the rhyolite and gran ite from both the eastern granite-rhyolite province and the southern granite-rhyolite province have Nd crustal residence ages indicating magma derivation from juvenile, mantle-derived sources that are only slightly older than the granites and rhyolites them selves. As a result, a relatively sharp boundary can be defined that separates Mesoproterozoic granites and rhyolites (regardless of age) having Nd crustal residence ages indicative of Paleoproterozoic crustal sources (TDM > 1,550 Ma) from ones having younger crustal sources (TDM < 1,550 Ma). This boundary extends northeasterly from southeastern Oklahoma through southeastern Missouri, southern Illinois, central Indi ana, southeastern Michigan, and into southwestern Ontario; its southwestern extension is not defined, but it probably parallels, and may be close to, the northwestern boundary of the Llano province in Texas. The underlying crust northwest of boundary line is inferred to be Paleoproterozoic, whereas the underlying crust southeast of this bound- Van Schmus, W. R., Bickford, M. E., and Turek, A., 1996, Proterozoic geology of the east-central Midcontinent basement, in van der Pluijm, B. A., and Catacosinos, P. A., eds., Basement and Basins of Eastern North America: Boulder, Colorado, Geological Society of America Special Paper 308. 7 on May 15, 2015 specialpapers.gsapubs.org Downloaded from 8 W. R. Van Schmus and Othersary is inferred to be Mesoproterozoic. We interpret this boundary ...

show abstract

Rb-Sr and U-Pb geochronology and distribution of rock types in the Precambrian basement of Missouri and Kansas

Cited by 70 publications

References 0 publications

Possible extension of the Midcontinent Rift in west Texas and eastern New Mexico

Possible extension of the Midcontinent Rift in west Texas and eastern New Mexico

Isotopic connections between basement rocks exposed in the St. Francois Mountains and the Arbuckle Mountains, southern mid-continent, North America

Proterozoic geology of the east-central Midcontinent basement

Contact Info

Product

Resources

About