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Rocknest

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Journal Article
Journal: PALAIOS
Published: 01 June 1992
PALAIOS (1992) 7 (3): 305–315.
Journal Article
Published: 01 November 1986
Journal of Sedimentary Research (1986) 56 (6): 831–847.
...John P. Grotzinger Abstract The superbly exposed Rocknest Formation, Wopmay Orogen, Northwest Territories, Canada, is an early Proterozoic (1.89 Ga) carbonate platform that formed along the eastern passive margin of Slave craton (Archean). The palinspastically restored shelf sequence is an eastward...
Journal Article
Journal: GSA Bulletin
Published: 01 October 1986
GSA Bulletin (1986) 97 (10): 1208–1231.
...JOHN P. GROTZINGER Abstract The superbly exposed Rocknest Formation, Northwest Territories, Canada, contains 140 to 160 shallowing-upward cycles (1 to 15 m thick) that contain distinctive marker beds and can be correlated for >200 km parallel to strike and >120 km perpendicular to strike...
Journal Article
Published: 01 December 1985
Canadian Journal of Earth Sciences (1985) 22 (12): 1781–1792.
...., and Frutexites sp. This assemblage, which is remarkable for its preservation in a carbonate matrix, is similar to one found in a stromatolitic chert facies in the Gunflint Iron Formation of Ontario. Taxa in four members of the overlying Rocknest Formation are preserved in cherty dolomites of inner-shelf...
Journal Article
Journal: Geology
Published: 01 December 1983
Geology (1983) 11 (12): 710–713.
...J. P. Grotzinger; J. F. Reed Abstract Abundant precipitation of aragonite is suggested by well-preserved fabrics in dolostones of the lower Proterozoic (1.9 Ga) Rocknest Formation. Fabrics include dolomite and silica after botryoidal aragonite in tepee structures and seafloor cement fans...
Journal Article
Journal: AAPG Bulletin
Published: 01 February 1985
AAPG Bulletin (1985) 69 (2): 260.
...John P. Grotzinger ABSTRACT The 1.90-1.89 billion year old Rocknest Formation in the Northwest Territories is a west-facing, passive-margin carbonate terrace in the foreland of Wopmay orogen. Initial outbuilding of an accretionary stromatolite rim over downslope facies was followed by upbuilding...
Image
Abrupt contact between carbonate platform (<b>Rocknest</b> Formation) and clastic ...
Published: 01 May 2010
Figure 2. Abrupt contact between carbonate platform (Rocknest Formation) and clastic rocks of the Calderian foredeep (Tree River Formation). The contact represents terminal drowning of the Coronation margin as it was pulled down into the trench beneath the Hottah terrane.
Image
Aerial view of Morel sill (left) near the <b>Rocknest</b> shelf edge.
Published: 01 May 2010
Figure 14. Aerial view of Morel sill (left) near the Rocknest shelf edge.
Journal Article
Published: 01 June 2018
American Mineralogist (2018) 103 (6): 857–871.
... materials include two wind-blown soils, Rocknest and Gobabeb, six mudstones in the Yellowknife Bay formation (John Klein and Cumberland) and the Murray formation (Confidence Hills, Mojave2, and Telegraph Peak), as well as five sandstones, Windjana and the samples of the unaltered Stimson formation (Big Sky...
FIGURES | View All (12)
Journal Article
Journal: AAPG Bulletin
Published: 01 March 1972
AAPG Bulletin (1972) 56 (3): 627–628.
...P. Hoffman Abstract The shelf facies of the Rocknest Formation (lower Proterozoic) consists of almost 200 cycles, each 5–50 ft thick. Each cycle has, in ascending order, a thin transgressive beach deposit of intraclast and ooid packstone, a subtidal graded and rippled dolomitic shale with syneresis...
Journal Article
Journal: Elements
Published: 01 February 2015
Elements (2015) 11 (1): 45–50.
... formed or altered and, in turn, into past habitable environments on Mars. The CheMin instrument was developed over a twenty-year period, mainly through the efforts of scientists and engineers from NASA and DOE. Results from the first four experiments, at the Rocknest, John Klein, Cumberland, and Windjana...
FIGURES | View All (8)
Journal Article
Published: 01 May 1996
Journal of Sedimentary Research (1996) 66 (3): 419–429.
... Huntsman Limestone of the Bulawayo greenstone belt, Zimbabwe; the 2.6 Ga Carawine Dolomite, Australia; the 1.90 Ga Rocknest Formation and the 1.8-1.2 Ga Dismal Lakes Group, Canada; the Ordovician Porterfield carbonate buildup, Virginia; and various Silurian carbonate buildups in the Midcontinent, United...
Journal Article
Journal: Geology
Published: 01 March 1990
Geology (1990) 18 (3): 227–230.
...J. W. Burdett; J. P. Grotzinger; M. A. Arthur Abstract Early Proterozoic marine carbonates of the Rocknest Formation (1.93-1.89 Ga) have very depleted δ 18 O values (about 8‰) relative to younger, Late Proterozoic marine carbonates that formed in similar depositional environments. Two isotopic...
Image
( a – f ) Olivine unit-cell parameter trends. Black circles represent liter...
Published: 01 June 2018
Figure 4. ( a – f ) Olivine unit-cell parameter trends. Black circles represent literature data. Red diamonds represent the pre-calibration CheMin Rocknest data. Blue squares represent the sample cell offset calibrated CheMin Rocknest data. These figures show that, despite the calibration being
Image
( a ) Plagioclase  c  vs. γ unit-cell parameters. Black circles represent l...
Published: 01 June 2018
Figure 3. ( a ) Plagioclase c vs. γ unit-cell parameters. Black circles represent literature plagioclase values. The red square represents pre-calibration CheMin Rocknest plagioclase values. ( b ) Plagioclase c vs. γ unit-cell parameters—sample cell offset calibration. Black circles represent
Image
CheMin sample types and sample locations (schematic). Stimson formation is ...
Published: 01 July 2018
Figure 1. CheMin sample types and sample locations (schematic). Stimson formation is unconformable above Murray formation. Fractures that host Greenhorn (altered Big Sky) and Lubango (altered Okoruso) cross the unconformity. Rocknest sand is from an inactive eolian deposit; Gobabeb sand is from
Image
Pie charts showing weight proportions of minerals and X-ray-amorphous compo...
in > Elements
Published: 01 February 2015
F igure 5 Pie charts showing weight proportions of minerals and X-ray-amorphous components in the Rocknest eolian deposit, the Sheepbed mudstone (John Klein and Cumberland), and the fine-grained sandstone at Kimberley (Windjana). Minerals in gray italics are at or near detection limits. Opx
Image
Evolved gas analysis data of ( a ) m/z 19 (H 2 O (g) ) measured from Rockne...
Published: 01 March 2016
Figure 9 Evolved gas analysis data of ( a ) m/z 19 (H 2 O (g) ) measured from Rocknest (RN) and John Klein (JK) samples by SAM and m/z 18 (H 2 O (g) ) measured from npWP in the laboratory, and ( b ) m/z 66 (SO 2(g) ) measured from Rocknest (RN) and John Klein (JK) samples by SAM and m/z 64 (SO 2
Image
Balanced composite cross sections through the fold-and-thrust belt by Rein ...
Published: 01 May 2010
Figure 15. Balanced composite cross sections through the fold-and-thrust belt by Rein Tirrul ( Hoffman et al., 1988 ). Line A–H is in the northern part of the belt, whereas line K–L is in the south ( Fig. 1 ). The Odjick and Rocknest Formations are the dominant formations of the passive margin
Image
Pyroxene quadrilateral ( Lindsley 1983 ) plotted with augite, pigeonite, an...
Published: 01 June 2018
pyroxenes. Contours represent temperature of formation at 100 °C intervals. Olivine compositions are plotted below the enstatite-ferrosilite join at the appropriate Fe/Mg ratios. ( a ) Wind-blown soils, Rocknest, and Gobabeb. Augite is represented as triangles, pigeonite as squares, and olivine as hexagons