Crustal Sinking and Formation of the Main Tectonic Structures and Igneous Provinces in the Arctic in the Late Cretaceous–Cenozoic: A View from the Subduction–Convective Model

2021 ◽  
Vol 501 (1) ◽  
pp. 901-905
Author(s):  
L. I. Lobkovsky ◽  
E. V. Shipilov ◽  
N. O. Sorokhtin
Keyword(s):  
Late Cretaceous ◽  
The Arctic ◽  
Tectonic Structures ◽  
Igneous Provinces ◽  
Convective Model

CRETACEOUS VERTEBRATES FROM THE ANDERSON RIVER N.W.T.

1967 ◽  
Vol 4 (1) ◽  
pp. 21-38 ◽  
Author(s):  
Dale A. Russell
Keyword(s):  
Arctic Ocean ◽  
Late Cretaceous ◽  
The Arctic ◽  
Lower Horizon ◽  
The Arctic Ocean

Vertebrate remains have been recovered from two horizons in late Cretaceous strata along the east bank of the Anderson River at latitude 69 °N. The lower horizon has produced a fauna very similar to that of the Niobrara Chalk in western Kansas, including mosasaurs, plesiosaurs, and abundant toothed birds. The upper horizon has yielded a moderately short-necked plesiosaur of cimoliasaurian affinities. These vertebrates lived in or near a strait linking the Arctic Ocean with the interior sea in very late Cretaceous time.

La Désirade island (Guadeloupe, French West Indies): a key target for deciphering the role of reactivated tectonic structures in Lesser Antilles arc building

2013 ◽  
Vol 184 (1-2) ◽  
pp. 21-34 ◽  
Author(s):  
Jean-Marc Lardeaux ◽  
Philippe Münch ◽  
Michel Corsini ◽  
Jean-Jacques Cornée ◽  
Chrystèle Verati ◽  
...  
Keyword(s):  
Late Pleistocene ◽  
Late Cretaceous ◽  
West Indies ◽  
Early Pleistocene ◽  
Lesser Antilles ◽  
Tectonic Structures ◽  
Vertical Movements ◽  
Late Pliocene ◽  
Lesser Antilles Arc

Abstract In this paper we present and discuss new investigations performed on both the magmatic basement and the sedimentary formations of La Désirade. We report structural and sedimentary evidences for several episodes of deformation and displacement occurring prior to the present day tectonics. The main faults, respectively N130 ± 10°, N040 ± 10° and N090 ± 10°, previously considered as marker of the current tectonic regime corresponds to reactivated tectonic structures developed first during late Cretaceous compression and second during Pliocene to early Pleistocene extension. We demonstrate also the importance of late Pliocene-early Pleistocene and middle-late Pleistocene vertical movements in this part of the Lesser Antilles fore-arc as well as the role of compressive tectonics in the over thickened character of the arc basement in the Guadeloupe archipelago.

scholarly journals Wind Forecasts for Rocket and Balloon Launches at the Esrange Space Center Using the WRF Model

2018 ◽  
Vol 33 (3) ◽  
pp. 813-833
Author(s):  
Ricardo Fonseca ◽  
Javier Martín-Torres ◽  
Kent Andersson
Keyword(s):  
Critical Role ◽  
Wrf Model ◽  
Arctic Region ◽  
Probability Of Detection ◽  
The Arctic ◽  
Weather Research And Forecasting ◽  
Sounding Rockets ◽  
Convective Model ◽  
Nonlocal Asymmetric ◽  
The Arctic Region

Abstract High-altitude balloons and rockets are regularly launched at the Esrange Space Center (ESC) in Kiruna, Sweden, with the aim of retrieving atmospheric data for meteorological and space studies in the Arctic region. Meteorological conditions, particularly wind direction and speed, play a critical role in the decision of whether to go ahead with or postpone a planned launch. Given the lack of high-resolution wind forecasts for this remote region, the Weather Research and Forecasting (WRF) Model is used to downscale short-term forecasts given by the Global Forecast System (GFS) for the ESC for six 5-day periods in the warm, cold, and transition seasons. Three planetary boundary layer (PBL) schemes are considered: the local Mellor–Yamada–Janjić (MYJ), the nonlocal Yonsei University (YSU), and the hybrid local–nonlocal Asymmetric Convective Model 2 (ACM2). The ACM2 scheme is found to provide the most skillful forecasts. An analysis of the WRF Model output against the launch criteria for two of the most commonly launched vehicles, the sounding rockets Veículo de Sondagem Booster-30 (VSB-30) and Improved Orion, reveals probability of detection (POD) values that always exceeds 60% with the false alarm rate (FAR) generally below 50%. It is concluded that the WRF Model, in its present configuration, can be used to generate useful 5-day wind forecasts for the launches of these two rockets. The conclusions reached here are applicable to similar sites in the Arctic and Antarctic regions.

scholarly journals The age of the Kap Washington Group volcanics, North Greenland

1982 ◽  
Vol 31 ◽  
pp. 49-55
Author(s):  
O. Larsen
Keyword(s):  
Arctic Ocean ◽  
Late Cretaceous ◽  
Volcanic Activity ◽  
Coastal Region ◽  
Ocean Basin ◽  
The Arctic ◽  
Fossil Plant ◽  
Plant Remains ◽  
The Arctic Ocean ◽  
North Greenland

The Kap Washington Group of peralkaline volcanics is exposed along the coast of North Greenland at 40°W. This coastal region is intruded by numerous NNE-NW-trending dolerite dykes of alkaline affinity. The volcanics and their basic intrusive counterparts appear to be related to the initial rifting in the Arctic Ocean basin. The timing of this rifting may be supported by accurate dating of the associated volcanic activity. An improved Rb/Sr age of 64±3 million years (i.e. approximately at the Cretaceous-Tertiary boundary) has been determined on rhyolitic lavas collected at Kap Kane, probably near the top of the volcanic sequence. The extrusive volcanic activity probably started already in late Cretaceous time, as in­dicated by fossil plant remains, found in sediments interbedded with the lavas on Lockwood 0.

scholarly journals Late Cretaceous seasonal ocean variability from the Arctic

Nature ◽  
2009 ◽  
Vol 460 (7252) ◽  
pp. 254-258 ◽  
Author(s):  
Andrew Davies ◽  
Alan E. S. Kemp ◽  
Jennifer Pike
Keyword(s):  
Late Cretaceous ◽  
The Arctic ◽  
Ocean Variability

scholarly journals Correlation between lithospheric magnetic anomalies and tectonic structures in the Norwegian-Greenland region of the Arctic

2018 ◽  
Vol 9 (4) ◽  
pp. 1163-1172 ◽  
Author(s):  
D. Yu. Abramova ◽  
L. M. Abramova ◽  
S. V. Filippov
Keyword(s):  
Geomagnetic Field ◽  
Large Scale ◽  
Deep Structure ◽  
Magnetic Anomalies ◽  
Field Vector ◽  
Point Of View ◽  
The Arctic ◽  
Tectonic Structures ◽  
Champ Satellite ◽  
Marginal Seas

The studies of the deep structure and tectonics of the Arctic are important for solving the fundamental problems of modern geodynamics and developing its natural resources. This region is also of interest from the geopolitical point of view, in particular, considering the boundaries of the marginal seas. Our study aims to investigate the lithospheric (anomalous) geomagnetic field in the Norwegian-Greenland region of the Arctic and to correlate the identified anomalies with tectonic structures located in the region under study. The database includes the CHAMP satellite measurements of the modulus of the total geomagnetic field vector (the satellite operated at the altitude of ~280 km). This article describes the satellite data processing method applied to distinguish between the lithospheric part and other components of the geomagnetic field. Map showing the total vector modulus of the lithospheric field has been constructed for the studied area. The article discusses the possible nature of the lithospheric magnetic anomalies and their relation to the processes that occur under the territory of Greenland. According to our interpretation of the maps, the geomagnetic field anomalies are related to the modern large-scale geological and tectonic structures located in the studied area. The obtained results can facilitate further comprehensive geological and geophysical studies and contribute to modeling of the evolution of the lithosphere.

scholarly journals New insights into the thermal regime and hydrodynamics of the early Late Cretaceous Arctic

2019 ◽  
Vol 157 (10) ◽  
pp. 1729-1746 ◽  
Author(s):  
Robert Spicer ◽  
Paul Valdes ◽  
Alice Hughes ◽  
Jian Yang ◽  
Teresa Spicer ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Potential Evapotranspiration ◽  
Global Climate ◽  
Vapour Pressure Deficit ◽  
Hydrological Regime ◽  
The Arctic ◽  
Climate Feedbacks ◽  
Leaf Analysis ◽  
Northern Alaska ◽  
Ne Russia

AbstractThe Arctic is warming faster than anywhere else of comparable size on Earth, impacting global climate feedbacks and the Arctic biota. However, a warm Arctic is not novel. The Late Cretaceous fossil record of the region enables a detailed reconstruction of polar environmental conditions, and a thriving extinct ecosystem, during a previous 'hothouse’ global climate. Using leaf form (physiognomy) and tree ring characteristics we reconstruct Cenomanian to Coniacian polar thermal and hydrological regimes over an average annual cycle at eight locations in NE Russia and northern Alaska. A new high spatial resolution (∼1 km) WorldClim2 calibration of the Climate Leaf Analysis Multivariate Program (CLAMP) yields results similar to, but often slightly warmer than, previous analyses, but also provides more detailed insights into the hydrological regime through the return of annual and seasonal vapour pressure deficit (VPD), potential evapotranspiration (PET) estimates and soil moisture, as well as new thermal overviews through measures of thermicity and growing degree days. The new results confirm the overall warmth of the region, particularly close to the Arctic Ocean, but reveal strong local differences that may be related to palaeoelevation in the Okhotsk–Chukotka Volcanogenic Belt in NE Russia. While rainfall estimates have large uncertainties due to year-round wet soils in most locations, new measures of VPD and PET show persistent high humidity, but with notably drier summers at all the Arctic sites.

Alaskan Cretaceous-Tertiary floras and Arctic origins

Paleobiology ◽  
1987 ◽  
Vol 13 (1) ◽  
pp. 73-83 ◽  
Author(s):  
Robert A. Spicer ◽  
Jack A. Wolfe ◽  
Douglas J. Nichols
Keyword(s):  
Late Cretaceous ◽  
Ellesmere Island ◽  
The Arctic ◽  
High Latitudes ◽  
Center Of Origin ◽  
Paleontological Data ◽  
Taxonomic Level ◽  
Standard Methodology ◽  
Middle Latitudes ◽  
Species Groups

Cretaceous floras in Alaska, when compared to those at mid-latitudes, generally indicate later appearances in Alaska of major clades and major leaf morphologies. Compared to mid-latitude floras, Alaskan Late Cretaceous floras contain few major clades. The Alaskan clades diversified but at a low taxonomic level. Migrational pathways into high latitudes were probably along streams. Similar patterns characterized the Alaskan Tertiary, although some southward migrations of lineages occurred during the Neogene.Review of other Arctic paleontological data from Ellesmere Island, previously used to suggest that the Arctic was a major center of origin during the Late Cretaceous, indicates that the ages of supposedly substantiating dinoflagellate floras were misinterpreted. When the dinoflagellate data are interpreted according to standard methodology, first occurrences of genera and species groups on Ellesmere are, like the Alaskan occurrences, later than first occurrences at middle latitudes.

Sign in / Sign up

Export Citation Format

Share Document