Facies and Provenance Analysis of the Midcontinent Rift System (MRS) in Kansas

Facies and Provenance Analysis of the Midcontinent Rift System (MRS) in Kansas
Author: Iffat Azmi
Publisher:
Total Pages:
Release: 2020
Genre:
ISBN:
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The Midcontinent Rift System (MRS) formed a half-graben that extends into NE Kansas. The Precambrian rift succession, penetrated by Texaco Noel Poersch#1 (NP#1) well in Washington Co. at depths between 2846 and 11300 ft, comprises two successions. The lower one (11300-7429 ft) is dominated by clastic sediments and the upper one (7429-2846 ft) mainly by volcanic rocks, which suggests a radical change during rift evolution. This study is aimed at describing the sedimentary succession within the rift in Kansas, relating variations in sedimentary facies to the different stages of rift development. Detailed facies and provenance analyses were carried out in discontinuous cores retrieved from the lower and upper successions (5395-11300 ft deep). Sixteen lithofacies were identified, grouped into six different facies associations (fluvial, eolian, mudflat/lake margin, lacustrine, alluvial fan, and fan delta). Overall, the studied succession comprises continental deposits laid down dominantly in alluvial and eolian settings, with the intermittent development of lacustrine systems. Three rift sequences, bound by flooding surfaces and controlled by tectonic pulses in rift basin, were identified. Superimposed on the tectonic phases, changing climate conditions resulted in recurrent dry and wet cycles. Provenance analysis showed a higher contribution of infracrustal rocks in the source areas. Minor shifts in provenance could be due to re-arrangements of faulted block and variable proportion of axial vs. transversal input into the rift basin. Despite the tectono-stratigraphic framework typical of a syn-rift succession, based on the available geochronological and compositional data, the rift succession in KS seems to be more compatible with post-rift successions elsewhere.

Middle Proterozoic to Cambrian rifting, central North America

Middle Proterozoic to Cambrian rifting, central North America
Author: Richard W. Ojakangas
Publisher: Geological Society of America
Total Pages: 331
Release: 1997-01-01
Genre: Science
ISBN: 0813723124
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Based on the Tenth International Basement Tectonics Conference held at the University of Minnesota-Duluth in August 1992, this volume contains 19 papers, 13 of which focus on the Middle Proterozoic Midcontinent Rift. An introductory essay discussing the Middle Proterozoic to Cambrian rifting in central North America is followed by contributions addressing topics including the Midcontinent Rift in Michigan and Minnesota, the Port Coldwell veins of northern Ontario, and petrography and sedimentation in the western Lake Superior region. The last five papers deal with the pre-Mount Simon basins of Ohio, the English Graben and the newly proposed East Continent Rift Complex, the Reelfoot Rift/Rough Creek Graben in the evolution of the Illinois Basin, and the A-type sheet granites in the Oklahoma Aulacogen of Cambrian age. Bandw illustrations. Annotation copyrighted by Book News, Inc., Portland, OR

Middle Proterozoic to Cambrian Rifting, Central North America

Middle Proterozoic to Cambrian Rifting, Central North America
Author: Richard W. Ojakangas
Publisher:
Total Pages: 336
Release: 1997
Genre: Science
ISBN: 9780813723129
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Based on the Tenth International Basement Tectonics Conference held at the University of Minnesota-Duluth in August 1992, this volume contains 19 papers, 13 of which focus on the Middle Proterozoic Midcontinent Rift. An introductory essay discussing the Middle Proterozoic to Cambrian rifting in central North America is followed by contributions addressing topics including the Midcontinent Rift in Michigan and Minnesota, the Port Coldwell veins of northern Ontario, and petrography and sedimentation in the western Lake Superior region. The last five papers deal with the pre-Mount Simon basins of Ohio, the English Graben and the newly proposed East Continent Rift Complex, the Reelfoot Rift/Rough Creek Graben in the evolution of the Illinois Basin, and the A-type sheet granites in the Oklahoma Aulacogen of Cambrian age. Bandw illustrations. Annotation copyrighted by Book News, Inc., Portland, OR

Provenance and Sediment Dispersal Trends from Mesoproterozoic Clastic Strata of the Keweenawan Supergroup, Midcontinent Rift System, Northern Michigan

Provenance and Sediment Dispersal Trends from Mesoproterozoic Clastic Strata of the Keweenawan Supergroup, Midcontinent Rift System, Northern Michigan
Author: Mark Joshua Brown
Publisher:
Total Pages: 292
Release: 2015
Genre: Geology, Stratigraphic
ISBN:
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The Midcontinent Rift system is a continent-scale (~2000 km long), Meso-Neoproterozoic tectonic feature within the North American midcontinent region. Volcanism and sedimentation associated with rifting occurred over a ~22 million-year period between ~1109-1087 Ma. Outcrops of Keweenawan Supergroup rocks occur along the shorelines of Lake Superior in northern Michigan (e.g., Keweenaw Peninsula and surrounding areas). Presented here are modal composition trends and U-Pb detrital zircon ages from the Copper Harbor Conglomerate, Freda Sandstone, and Jacobsville Sandstone of the Keweenawan Supergroup. U-Pb detrital zircon ages from rift-fill strata of the syn-rift Copper Harbor Conglomerate reveal primary age peaks (n=543) of 1329 Ma, 1225 Ma, and 1111 Ma and secondary age peaks of 1890, 1769, 1464, 1232, and 1094 Ma. Modal composition trends from the Copper Harbor Conglomerate reflect variable occurrences of monocrystalline quartz and lithic volcanic fragments and pervasive occurrences of feldspar. U-Pb detrital zircon ages from overlying strata of the syn-rift Freda Sandstone include a primary peak age of 1888 Ma and secondary peak ages of 2660 and 1232 Ma. Modal composition trends reveal an abundance of monocrystalline quartz with moderate occurrences of feldspar and a minor contribution of lithic volcanic detritus. U-Pb detrital zircon ages from overlying strata of the post-rift Jacobsville Sandstone include primary peak ages of 1227, 1330 and 1464 Ma, with a secondary age peak of 1108 Ma, and isolated peaks of 1657 and 1883 Ma. Modal composition trends reveal an abundance of monocrystalline quartz with significant occurrences of feldspar and variable amounts of lithic fragments among samples. Provenance data from the Copper Harbor Conglomerate suggest primary derivation of sediment from the Midcontinent Rift and/or Grenville magmatic sources, and minor contributions from Trans-Hudson/Penokean, Yavapai, Mazatzal, and Grenville magmatic source areas. Provenance trends for the Freda Sandstone show that detritus was derived from Trans-Hudson/Penokean and Superior province magmatic sources with minor contributions from magmatic sources associated with the Grenville-Midcontinent Rift and Granite-Rhyolite province. Provenance data from the Jacobsville Sandstone indicate that primary magmatic source areas were the Grenville/Midcontinent Rift and Granite-Rhyolite province with minor contributions from the Mazatzal and Trans-Hudson/Penokean provinces.