Late Cretaceous Multicolored Shales and Phosphatic Sedimentary Rocks in Egypt: ABSTRACT

AAPG Bulletin ◽  
1983 ◽  
Vol 67 ◽  
Author(s):  
C. R. Glenn, R. E. Garrison, M. A.
Keyword(s):  
Late Cretaceous ◽  
Sedimentary Rocks

Petrography and provenance of the Marambio Group, Vega Island, Antarctica

1994 ◽  
Vol 6 (4) ◽  
pp. 517-527 ◽  
Author(s):  
Duncan Pirrie
Keyword(s):  
Late Cretaceous ◽  
Sedimentary Rocks ◽  
Clay Mineralogy ◽  
Minor Component ◽  
Source Area ◽  
Low Grade ◽  
Western Margin ◽  
Sediment Input ◽  
A Minor ◽  
Sandstone Petrography

Late Cretaceous sedimentary rocks assigned to the Santa Marta (Herbert Sound Member) and López de Bertodano (Cape Lamb and Sandwich Bluff members) formations of the Marambio Group, crop out on Cape Lamb, Vega Island. Although previous studies have recognized that these sedimentary rocks were derived from the northern Antarctic Peninsula region, the work presented here allows the provenance and palaeogeographical evolution of the region to be described in detail. On the basis of both sandstone petrography and clay mineralogy, the Herbert Sound and Cape Lamb members reflect sediment input from a low relief source area, with sand grade sediment sourced from low grade metasediments, and clay grade sediment ultimately derived from the weathering of an andesitic source area. In contrast, the Sandwich Bluff Member reflects a switch to a predominantly andesitic volcaniclastic source. However, this sediment was largely derived from older volcanic suites due to renewed source area uplift, with only a minor component from coeval volcanism. Regional uplift of both the arc terrane and the western margin of the James Ross Basin was likely during the Maastrichtian.

The Desert Sandstone of Australia A Late Nineteenth-Century Enigma of Deposition, Fossils, and Weathering

2004 ◽  
Vol 23 (2) ◽  
pp. 208-256 ◽  
Author(s):  
David Branagan
Keyword(s):  
Late Cretaceous ◽  
Sedimentary Rocks ◽  
Late Nineteenth Century ◽  
Late Mesozoic ◽  
Weathering Processes ◽  
Geological Maps ◽  
Different Ages ◽  
Lateral Extent ◽  
Similar Appearance ◽  
Late Nineteenth

The term "Desert Sandstone" was featured on geological maps and in the literature of Australian geology for more than eighty years from 1872. The name was suggested by Richard Daintree (1832-1878) (1868) for what were later described as "a promiscuous lot of sediments that form a dissected tableland in some of the drier portions of the continent" (Howchin, 1918). The name became current, particularly in Queensland, but there were many problems in mapping the unit, which was at first thought to be of Tertiary age, but then became largely accepted as Late Cretaceous.While some geologists thought the unit was of marine origin, others believed it was aeolian, even partly made of volcanic dust, but most geologists thought it was largely lacustrine. In many areas the rock appeared to be highly silicified, and opinions differed as to the source of silicification—a former covering of basalt, or siliceous hot waters from below?Complications arose when Glossopteris, regarded as a Late Palaeozoic fossil, was found in the "Desert Sandstone," and arguments arose about the possibility of this plant having persisted in Australia until the late Mesozoic.The stratigraphic/palaeontological problems were eventually sorted out by detailed mapping, which showed that there were in fact a number of sandstones of similar appearance but quite different ages. It took longer to realise that the apparent uniformity of sedimentary rocks of different ages was largely the result of weathering, which produced the silicified "duricrust" in many parts of inland Australia.The "Desert Sandstone" played an important part in the unravelling of three important lines of earth history in Australia (and there were even repercussions abroad). These were: (a) sedimentation during the Mesozoic and Cainozoic; (b) the clarification of the temporal range (and lateral extent) of the Glossopteris flora; and (c) the weathering processes that produced some of the characteristic scenery of inland Australia.

scholarly journals LATE CRETACEOUS STRATIGRAPHY OF THE SOUTHEASTERN CHACO - PARANÁ BASIN (“NORTE BASIN” - URUGUAY): THE MAASTRICHTIAN AGE OF THE CALCRETIZATION PROCESS

2019 ◽  
Vol 38 (2) ◽  
pp. 427-449 ◽  
Author(s):  
Gerardo VEROSLAVSKY ◽  
Natalie AUBET ◽  
Sergio A. MARTÍNEZ ◽  
Larry M. HEAMAN ◽  
Fernanda CABRERA ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Sedimentary Rocks ◽  
Field Work ◽  
Geological Mapping ◽  
Practical Usefulness ◽  
Evolutionary Scheme ◽  
Calcite Cement ◽  
Absolute Age ◽  
Siliciclastic Rocks ◽  
Epigenetic Processes

In the last 40 years, successive revisions have been introduced to the lithostratigraphy of the Late Cretaceous of the Norte Basin, whose record is formed by predominantly siliciclastic continental fossiliferous sedimentary rocks. A factor that contributed to the terminology proliferation was the misplaced importance attributed to the epigenetic processes and products (calcretes and ferricretes, occasionally fossiliferous) affecting those siliciclastic rocks. Based on field work and lithological logs from a number of key areas, the validity of the original stratigraphic column showing, from base to top, the Guichón, Mercedes, Asencio and Queguay formations is supported. For those particular units, the lithostratigraphic scope given by the original definitions is correct and, with minimum adjustments, they should be restored for their practical usefulness as geological mapping units. An evolutionary scheme for the Late Cretaceous of the Norte Basin is herein presented, with the aim of contributing to a greater understanding of the succession of sedimentary and epigenetic processes. A Maastrichtian age is proposed for the carbonatic cementation and/or substitution that affected the Mercedes and Asencio formations, thus originating the Queguay Formation, based on absolute age of the calcite cement (~ 72 Ma; U-Pb), paleontological data, and the correlation established with similar events recorded in the Marília Formation on the Bauru Basin (Brazil).

scholarly journals Enigmatic clusters of sandstone boulders on plateaus of the Stołowe Mountains (Sudetes, south-west Poland) – their geoheritage and geotouristic value

Geologos ◽  
2021 ◽  
Vol 27 (3) ◽  
pp. 141-155
Author(s):  
Piotr Migoń ◽  
Krzysztof Parzóch
Keyword(s):  
Late Cretaceous ◽  
Sedimentary Rocks ◽  
Long Distance ◽  
Long Distance Transport ◽  
South West ◽  
History Of ◽  
Clastic Sedimentary ◽  
Distance Transport ◽  
Plateau Level

Abstract Among sites of geomorphological interest in the tableland of the Stołowe Mountains, consisting of clastic sedimentary rocks of Late Cretaceous age, are enigmatic occurrences and clusters of sandstone boulders within plateau levels that are underlain by mudstones and marls. These boulders are allochthonous, having been derived from the quartz sandstone beds that support the upper plateau level and stratigraphically are in excess of 50 m above the altitudinal position of the boulders. Topographic conditions preclude long-distance transport from the escarpment slopes; boulders are hypothesised to be the last remnants of completely degraded outliers (mesas) of the upper plateau. Their present-day altitudinal position is explained by passive ‘settling’ following disintegration of caprock and denudation of the underlying weaker rocks. Two localities are here presented in detail, Łężyckie Skałki and Pustelnik, along with adjacent boulder trains in the valleys incised into the plateau. It is argued that both localities have considerable geoheritage value and both play the role of geosites, although on-site facilities are so far limited. However, the complex history of boulders sets a series of challenges for successful geo-interpretation.

Late Cretaceous metamorphism of sedimentary rocks in the eastern Gangdese magmatic arc and its tectonic significance

2021 ◽  
Vol 37 (11) ◽  
pp. 3445-3463
Author(s):  
LI ZhongYao ◽  
◽  
DING HuiXia ◽  
YUAN Yue ◽  
ZHANG ZeMing
Keyword(s):  
Late Cretaceous ◽  
Sedimentary Rocks ◽  
Magmatic Arc ◽  
Tectonic Significance

EVOLUTION OF THE PERTH AND CARNARVON BASINS

1972 ◽  
Vol 12 (2) ◽  
pp. 52
Author(s):  
J.J. Veevers
Keyword(s):  
Marine Sediments ◽  
Late Cretaceous ◽  
Sedimentary Rocks ◽  
Late Carboniferous ◽  
The South ◽  
The North ◽  
Southwest Australia ◽  
Northern Carnarvon Basin ◽  
Carnarvon Basin

Along the present southwest Australian margin, in the Perth and Carnarvon Basins, the wholly nonmarine Permian, Triassic, and Jurassic sedimentary rocks of the southern Perth Basin pass northwards into paralic and marine equivalents of the Carnarvon Basin, which additionally contains marine Silurian, Devonian, and Carboniferous rocks. These contrasts are interpreted in terms of the re-assembly of Australia in Gondwanaland: the southern Perth Basin lay alongside India in the interior of Gondwanaland, and the northern Carnarvon Basin faced a gulf of Tethys.According to this model, southwest Australia was arched in the Late Carboniferous, and the arch collapsed by rifting in the Permian, Triassic, and Jurassic, with the accumulation of thick nonmarine (in the south) to paralic and marine sediments (in the north). Rupture from India was marked by the eruption of basalt in the earliest Cretaceous, and dispersal of India and Australia was marked by rapid marginal subsidence in the Late Cretaceous. This model, derived from stratigraphical and faciological data, is supported by the ridge-and-rift structure of southwest Australia.

scholarly journals Geochemistry and Pb Isotopic Proof for Sources of Heavy Metal(Loid)s in Late Cretaceous Sandstones From Eastern Pontides (NE Turkey)

2021 ◽  
Author(s):  
Çiğdem Saydam Eker
Keyword(s):  
Heavy Metal ◽  
Late Cretaceous ◽  
Sedimentary Rocks ◽  
Pollution Index ◽  
Isotopic Analysis ◽  
Pollution Load Index ◽  
Anthropogenic Sources ◽  
Multivariate Statistical ◽  
Eastern Pontides ◽  
Pollution Levels

Abstract Upper Cretaceous sedimentary rocks are widely exposed around Trabzon, Giresun and Gümüşhane in the eastern Pontides. The sedimentary rocks are mainly composed of sandstones and marls, and the thicknesses of these rocks range from 170 m to 400 m. This paper focused on Late Cretaceous sandstones of Trabzon, Giresun and Gümüşhane regions to identify the concentrations, sources, deposition environment and conditions of certain heavy metal(loid)s (Zn, Pb, Cu, Ni, As, Co, Mo and V). Enrichment factor (EF), geo-accumulation index (Igeo), Pollution index (Pi), Pollution load index (Pln), Pb isotope and multivariate statistical analysis were performed to elucidate the pollution levels and sources. The mean concentrations of Zn, Pb, Cu, Ni, As, Co, Mo and V were 16.5, 10.8, 9.4, 13.2, 2.1, 4.4, 0.2 and 21 mg/kg, respectively in the Trabzon area, 35, 5.8,18.8, 102, 3.2, 18.6, 0.5 and 109 mg/kg, respectively in the Giresun area, and 36, 8.9, 14.7, 82, 3.9, 16.9, 0.3 and 106 mg/kg, respectively in the Gümüşhane area. In general, the evaluation indices exhibited that the sandstones were moderately polluted by As in the Trabzon area, and strongly polluted by Ni and As, moderately polluted by Co and V in the Giresun and Gümüşhane areas. The results of multivariate statistical analyses indicated that As and partly Pb might be originated from anthropogenic sources, whereas other metals were derived from geogenic origin. Lead isotopic analysis demonstrated two characterized signatures of the pollution sources in the sandstones, one related to geogenic origin and the other to coal, gasoline and pesticides. The sandstones were deposited in transition – marine environment under oxic – weak oxic conditions and paleoclimatic conditions ranged from arid to moist during Late Cretaceous period.

Chapter 4 Late Cretaceous to Eocene cover of New Caledonia: from rifting to convergence

2020 ◽  
Vol 51 (1) ◽  
pp. 53-91 ◽  
Author(s):  
P. Maurizot ◽  
A. Bordenave ◽  
D. Cluzel ◽  
J. Collot ◽  
S. Etienne
Keyword(s):  
Late Cretaceous ◽  
Tectonic Evolution ◽  
New Caledonia ◽  
Volcanic Rocks ◽  
Sedimentary Rocks ◽  
Foreland Basin ◽  
Late Eocene ◽  
Sw Pacific ◽  
Basement Rocks ◽  
Second Period

AbstractIn New Caledonia, the cover refers to the autochthonous Late Cretaceous to Paleogene sedimentary and volcanic formations unconformably overlying the basement rocks and underlying the allochthonous nappes. The first period of deposition, broadly from the Late Cretaceous to Paleocene (c. 105–56 Ma) was controlled by extension and rifting. The second period, broadly the Eocene (c. 56–34 Ma), was dominated by convergence and contraction. The Late Cretaceous part of the cover consists of synrift conglomerates and coal-bearing deposits with interlayered bimodal, subduction-related and intra-plate volcanic rocks. The post-rift deposits are deep water sedimentary rocks deposited under anoxic conditions with reduced terrigenous input. The Paleocene to Eocene formations, mainly carbonates, attest to profound palaeogeographical changes and a switch to a different geodynamic regime, linked to the onset of Eocene convergence. The Middle to Late Eocene formations are typically composed of turbidites and breccias. They were deposited in a typical flexural foreland basin context as an upwards-coarsening sequence topped by an olistostrome. They are associated with tectonic convergence and east-dipping subduction that led to the end-Eocene obduction of ophiolitic nappes. This two-fold evolution, extension then compression, can be integrated in the wider framework of the plate tectonic evolution of the SW Pacific.

Tectonic Overprinting near Ware, Northern Rocky Mountain Trench

1972 ◽  
Vol 9 (7) ◽  
pp. 903-913 ◽  
Author(s):  
G. H. Eisbacher
Keyword(s):  
Late Cretaceous ◽  
Late Jurassic ◽  
Upper Cretaceous ◽  
Sedimentary Rocks ◽  
Rocky Mountain ◽  
Normal Faulting ◽  
North Central ◽  
The Core ◽  
The North ◽  
Central Cordillera

Mapping in the core of the north–central Cordillera of British Columbia has revealed a system of relatively closely spaced steeply dipping faults cutting across an earlier penetrative fabric consisting of recumbent folds and intensely cleaved sedimentary rocks. The earlier (Mid – Late Jurassic) penetrative deformation was separated from the later (Late Cretaceous – Tertiary) deformation by regional uplift, normal faulting, and initiation of intermontane deposition. The Upper Cretaceous – Lower Tertiary Sifton Formation was involved only in the later deformational pulse. Kink folding and oblique faulting are the principal mechanisms of the later pulse. The orientation of principal regional contraction changed from an early WSW–ENE direction to a late SSW–NNE direction. From this it is inferred that some of the young lineaments along and near the Rocky Mountain Trench are probably oblique–slip faults with unknown, but probably small right–lateral slip components.

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