jacobsville sandstone age
1120 Ma and failed—ceased extending—at ca. below the MCL, and CFC age dating of wells along a flow path. is compatible with existing hypotheses on the evolution of the Midcontinent Rift. By continuing to use our website, you are agreeing to our, Paleozoic sediment dispersal before and during the collision between Laurentia and Gondwana in the Fort Worth Basin, USA, Detrital zircon ages and provenance of the Upper Paleozoic successions of Kotel’ny Island (New Siberian Islands archipelago), Stratigraphic trends in detrital zircon geochronology of upper Neoproterozoic and Cambrian strata, Osgood Mountains, Nevada, and elsewhere in the Cordilleran miogeocline: Evidence for early Cambrian uplift of the Transcontinental Arch, U-Pb and Hf isotope analysis of detrital zircons from the Banks Island assemblage (coastal British Columbia) and southern Alexander terrane (southeast Alaska), Detrital zircon geochronology of pre-Cretaceous strata: tectonic implications provides U-Pb geochronological data for the youngest 20 detrital grains out of the 2050 examined in their study. No major glacial periods occurred between ca. 1086 Ma (Davis and Paces, 1990), within the Ottawan, whereas subsidence probably continued beyond the Ottawan. By D. A. (2013) reported 105 ages for the basal Jacobsville Sandstone near Marquette, Michigan. The deposition of JS on top of the unconformity cannot be assumed to be synchronous. 3) were sampled and analyzed for this study, and 2050 new ages were determined. Western Michigan University, 1991 The major fracture systems in the Jacobsville sandstone likely originated by reverse faulting on the Keweenaw fault and by glacial ly produced thrusting. Nest to Preques Isle State Park to view the Jacobsville Sandstone, and then find the Great Unconformity. Given the questions and uncertainties regarding the data, the resulting interpretations presented by Malone et al. Recent new zircon data for the Jacobsville collected in summer 2015 should help resolve this question. Provenance studies (Kalliokoski, 1982; Hedgman, 1992) have concluded that the early Proterozoic rocks and Archean rocks to the south (Marquette Range Supergroup in the Gogebic Iron Range) contributed to the Jacobsville Sandstone; although Hedgman (1992) favors an additional source to the north. (2004), Denyszyn et al. Zircons were extracted from the pan concentrate using heavy liquids and a Frantz magnetic separator. David H. Malone, Carol A. Stein, John P. Craddock, Jonas Kley, Seth Stein, John E. Malone; Maximum depositional age of the Neoproterozoic Jacobsville Sandstone, Michigan: Implications for the evolution of the Midcontinent Rift. The JBE's age is poorly constrained, with proposed ages ranging from ~1100 - ~542 Ma. Age is Late Cambrian. 1060–1040 Ma. In this view, deformation of the JBE by reverse faults including the Keweenaw and Douglas faults occurred at ~1.060 Ga, reflecting Grenville compression ending the MCR's evolution. Jacobsville Sandstone, Late Precambrian or Early Paleozoic Over 550 million years ago The Jacobsville Sandstone is a sedimentary rock, which is over 550 million years old. 1.3–0.98 Ga culminating in the assembly of Rodinia. Reconstructions (Li et al., 2013) for times after the Grenville orogeny to the end of the Precambrian do not indicate significant collisional events. Both the Bighorn Basin and Uinta Mountain areas contain gastroliths of Carboniferous age. These results confirm the result of Craddock et al. Sandstone dike, Jacobsville formation.....50 Figure 84. The sedimentary rocks of the central part of the rift This Shingle Style house has a Jacobsville sandstone first floor and the distinguishing shingles on the second floor. Based on the paleomagnetic data, the Jacobsville was deposited during a time when it was just south of the equator and represents the youngest member of the rock formations comprising the Lake Superior basin. 570–555 Ma. The maximum depositional age (MDA), based on the youngest four grains with overlapping ages, is 959 ± 19 Ma (mean square of weighted deviates [MSWD = 0.29]; Fig. Malone et al. Simon sandstone, which is the time equivalent to Jacobsville sandstone in northern Michigan (Cohee, 1948), is a fine- to coarse-grained sandstone with the occasional dolomite bed (Foley, 1953). As shown in Figure 1B, the volcanics (up to ∼20 km thick) and overlying synrift and postrift sediments (∼6 km) of the Oronto Group lie within a synclinal basin below the lake. The red Jacobsville Sandstone, a good building stone, was formerly quarried at Jacobsville and used for building purposes until shipping costs and cheaper cement-concrete materials made production costs prohibitive. Jacobsville Sandstone is composed of: 27.4% nonundulatory quartz, 27.0% undulatory quartz, 23.0% potassium feldspar, and 12.3% silicic volcanic clasts. However, one paleosol beneath the Jacobsville near site #3 (Fig. 6). 755, ca. 1150 Ma (Heaman et al., 2007). Marquette Iron Range 5. It is for these deposits that the discrepancy in paleo-magnetic direction is found. It has been proposed that the JBE were deposited shortly prior to or during the time when the MCR failed—ceased extending—due to regional compression occurring as part of the Grenville orogeny. However, paleomagnetic, structural, compositional, and detrital zircon data suggest that these units are much younger than previously thought, so much of the deformation thought to have occurred at ~1.06 Ga is likely much younger. thesis], Geophysical investigations and crustal structure of the North American Midcontinent Rift system, The Midcontinent Rift System: A major Proterozoic continental rift, An equatorial Laurentia at 550 Ma confirmed by Grenvillian inherited zircons dated by LAM ICP-MS in the Skinner Cove volcanics of western Newfoundland: Implications for inertial interchange true polar wander, Age and deformation of Early Proterozoic Quartzites in the southern Lake Superior region: Implications for the extent of foreland deformation during the final assembly of Laurentia, The Geological Story of Isle Royale National Park, Protracted continental collision—Evidence from the Grenville orogen, Evidence for a major Late Precambrian tectonic event (rifting?) Lake Superior and the spectacular scenery around it, as seen in places like Pictured Rocks and Apostle Islands National Lakeshores, result from one of the more important processes shaping our planet – the breaking apart of continents to form new oceans. The Neoproterozoic Jacobsville Sandstone outcrops along the south and east shores of Lake Superior, USA. It is a river/lake deposited, feldspar-rich quartz sandstone, deep red in color with white mottling. By Mary Drew at Pasty Central (Mdrew) on Wednesday, August 15, 2012 - 11:42 pm: In most cases, the JBE are in fault contact with the Oronto Group. 2001) (Fig. Notice, Smithsonian Terms of Lockett (1947) postulated that the sandstone in the Clark County well thickens to the south and west, filling a low in the Precambrian age sandstone cliffs are also common along the adjacent Wisconsin shoreline of Lake Superior, on the Bayfield Peninsula and Apostle Islands National ... of many Jacobsville sandstone cliffs supports little or no vegetation (Albert et al 1997a and 1997b). 2014a, 2014b; Stein 2015; Mitchell and Sheldon 2016). (1989), Symons and Chiasson (1991), Meert et al. Stacked PDP's comparing detrital zircon age spectra of UT gastroliths (blue), Ionia Sandstone (red), and the Jacobsville Formation (green). Cannon et al. Jacobsville sandsone, sedimentary rock, found in Sault Ste. Found inside – Page 37... of Middle Silurian age Cm - Munising Sandstone of Cambrian age PCf - Freda Sands tone of Keweenawan age ( Precambrian ) PC ) - Jacobsville Sandstone of Precambrian age ALTITUDE : Land - surface datum in feet above mean sea level . Taken on 5-13-2012 FIGURE 2C: Shale Cobbles in the Jacobsville Looking East GPS: 46.46020 –84.05781
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