Evidence for Late Cretaceous Volcanism in Trans‐Pecos Texas

2007 ◽  
Vol 115 (2) ◽  
pp. 243-251 ◽  
Author(s):  
John A. Breyer ◽  
Arthur B. Busbey III ◽  
Richard E. Hanson ◽  
Kenneth E. Befus ◽  
William R. Griffin ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
In Trans ◽  
Cretaceous Volcanism

Bosphorus Volcano; Signs of an Ancient Volcano on an Ancient City

2020 ◽  
Author(s):  
Semih Can Ülgen ◽  
A.M. Celâl Şengör ◽  
Mehmet Keskin ◽  
Namık Aysal
Keyword(s):  
Late Cretaceous ◽  
Upper Cretaceous ◽  
Contact Aureole ◽  
Magma Chambers ◽  
Basement Rocks ◽  
Ancient City ◽  
Nw Turkey ◽  
Dome Structure ◽  
Cretaceous Volcanism ◽  
Arc Volcano

<p>In many ancient and active volcanic provinces dyke systems represent radial and concentric patterns. In İstanbul, NW Turkey, late Cretaceous dykes, which are emplaced in pre-Cretaceous basement rocks consisting of sedimentary rocks of Palaeozoic and Triassic ages, have both patterns. In the region, late Cretaceous volcanism is represented by three elements, (1) The Çavuşbaşı granitoid, (2) volcano-sedimentary units and (3) dykes.</p><p>Age of the Çavuşbaşı granitoid is given as 67.91±0.63 to 67.59±0.5 Ma. It is emplaced in shallow depth and has an indistinct contact aureole. Volcano sedimentary units were deposited in an intra-arc basin. Three types of dykes are reported in the region: lamprophyre, diabase and intermediate to felsic dykes (72.49±0.79 to 65.44±0.93 Ma). Different petrology and the crystallization depths of the crystals in the dykes and the Çavuşbaşı granitoid suggest two different magma chambers emplaced at two different depths, the Çavuşbaşı granitoid representing the shallower one.</p><p>Upper Cretaceous dykes are concentrated around the Çavuşbaşı granitoid and extend almost as far as 30 km away from the pluton. The intrusion of the plutonic body of the Çavuşbaşı granitoid caused a dome structure in the basement rocks. The formation of this dome structure may have controlled the stress field and the orientation of the dyke system. Similar patterns are observed in the British Tertiary igneous province, Galapagos volcanoes, Boa Vista (Cape Verde), Summer Coon volcano, Spanish Peak Mountain and Dike Mountain (Colorado), Vesuvio, Etna and Stromboli (Italy).</p><p>We suggest that Upper Cretaceous volcanic edifice in the İstanbul region is related to an arc volcano similar to the andesitic volcanoes in the Sumatra Island; we name it the Bosphorus Volcano.  </p>

The effects of strike-slip motion along the Cobequid - Chedabucto - southwest Grand Banks fault system on the Cretaceous-Tertiary evolution of Atlantic Canada

2004 ◽  
Vol 41 (7) ◽  
pp. 799-808 ◽  
Author(s):  
Georgia Pe-Piper ◽  
David J.W Piper
Keyword(s):  
Late Cretaceous ◽  
Fracture Zone ◽  
Large Scale ◽  
Strike Slip ◽  
Fault System ◽  
Grand Banks ◽  
Tectonic Model ◽  
Geological Features ◽  
Cretaceous Volcanism ◽  
Slip Motion

The Newfoundland Fracture Zone, the southwest Grand Banks transform, and the Cobequid–Chedabucto fault zone form a linked strike-slip fault system from the Atlantic Ocean to southeastern Canada. This paper suggests that several large-scale geological features in southeastern Canada are the result of a small amount of strike-slip motion on the system during the mid Cretaceous and Oligocene. Regional extension features developed in the releasing bend in the Laurentian sub-basin during the mid Cretaceous, but the same area experienced Oligocene compression. This tectonic model accounts for the distribution of mid-Cretaceous volcanism, fault-bounded basins, and regional unconformities, as well as mid to late Cretaceous subsidence of the Scotian basin and Oligocene uplift of the eastern Scotian Shelf.

DECIPHERING LATE CRETACEOUS VOLCANISM WITHIN RIPLEY FORMATION BENTONITES USING U-PB DETRITAL ZIRCON GEOCHRONOLOGY

2018 ◽  
Author(s):  
Elizabeth J. Vitale ◽  
◽  
Jennifer N. Gifford ◽  
Brian F. Platt
Keyword(s):  
Late Cretaceous ◽  
Detrital Zircon ◽  
Zircon Geochronology ◽  
Detrital Zircon Geochronology ◽  
Cretaceous Volcanism

Late Cretaceous volcanism and fluid circulation in the South Atlantic: Insights from continental carbonates in the onshore Namibe Basin (Angola)

2021 ◽  
Vol 134 ◽  
pp. 105351
Author(s):  
E. Fiordalisi ◽  
M. Marchegiano ◽  
C.M. John ◽  
N. Oxtoby ◽  
N. Rochelle-Bates ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
South Atlantic ◽  
Fluid Circulation ◽  
The South ◽  
Cretaceous Volcanism ◽  
Continental Carbonates

Petrogenesis of Late Cretaceous Volcanism in Kazhaba Area and its relationship with mantle plume activity of Reunion hotspot

2017 ◽  
Vol 28 (2) ◽  
pp. 229-240 ◽  
Author(s):  
Rehanul Haq Siddiqui ◽  
Changqian Ma
Keyword(s):  
Mantle Plume ◽  
Late Cretaceous ◽  
Cretaceous Volcanism

scholarly journals Petrogenetic peculiarities of Fe-Ti oxide minerals in the processes of crystallization and evolution of late Cretaceous volcanic complexes of the Lesser Caucasus

2021 ◽  
Vol 30 (4) ◽  
pp. 692-705
Author(s):  
Musa Nasib ogly Mammadov ◽  
Gultekin Javad gizi Babayeva
Keyword(s):  
Titanium Oxide ◽  
Late Cretaceous ◽  
Reaction Series ◽  
Titaniferous Magnetite ◽  
Poorly Differentiated ◽  
Higher Temperature ◽  
Oxide Minerals ◽  
Cretaceous Volcanism ◽  
Lesser Caucasus ◽  
Titanium Magnetite

Drawing from the determined differences between iron-titanium oxide minerals, we analyzed the conditions of crystallization and evolution of late-Cretaceous magmatic complexes of the Lesser Caucasus. It was found that the rocks of basalt-andesibasalt complex, which correspond to the early substage (upper Coniacian-lower Santonian) of late-Cretaceous volcanism in the Qazakh, Agjakand, Agdara depressions, have crystallized in the conditions of relatively highly- thermobaric crystallization of titanomagnetite, poorly differentiated and evolutionized according to the Fenner trend. In the second substage of volcanism, due to decrease in permeability of the Earth’s crust, the elevation of the remaining magma to the upper horizons was hindered. Therefore, within the Qazakh depression, shallow intermediate sites of crystallization developed where moderately titaniferous magnetite crystallized with the participation of oxidized fluids earlier than hornblende, pyroxene and plagioclase. Thus, the remaining magma evolutionized its composition through Bowen’s reaction series. In the Agjakand and Agdara depressions, change of previous expansion to compaction was the cause of hindering of partly fractioned portion of the magma. The latter thermally interacted with the above-embedded maghemite, hematite and in a number of cases magnetite. In the Khojavand depression, rocks of trachibasalt- trachiodolerite complex, which characterize the late substage of the Santonian volcanism, contain moderately titanium magnetites and maghemites. In the second substage of volcano-plutonism, rocks of tephrite-teshenite complex developed. There, accompanied by oxidized fluids, highly-clayey titanomagnetite crystallized before chrome-diopside and salite. However, the ulvospinel titanomagnetite in teshenites, having associated with barkevikite and kaersutite, crystallized at a relatively higher temperature. Within the Senonian volcanites of the Azykh depression, along with the moderately-titanium magnetite, chromic titanomagnetite and rarely chromite was determined. Similar mineralogical diversities are also characteristic for the Gochas depression.

Trilogy Of Southeast Sundaland Terranes: Re-Uniting Drifted Terranes of Southeast Sundaland Using Common Marker ff The Late Cretaceous Volcanics to Volcanic-Clastics of The Meratus Mountains, South Sulawesi, And Sumba - Implications For Petroleum Opportunities

2021 ◽  
Author(s):  
A. H. Satyana
Keyword(s):  
Late Cretaceous ◽  
Field Studies ◽  
Source Rocks ◽  
South Sulawesi ◽  
Rock Formations ◽  
Common Marker ◽  
The Common ◽  
Tethys Ocean ◽  
Cretaceous Volcanism ◽  
Surrounding Areas

Amalgamation and dispersion of terranes characterized the growth and slivering of Southeast Sundaland into the present configuration of central Indonesia. Amalgamation of the Paternoster-West Sulawesi terrane which docked, in mid-Cretaceous time, onto the Southwest Borneo terrane, thus closed the Meso-Tethys Ocean at the Meratus suture. This made Sundaland expand its area to the east and southeast. In the Late Cretaceous time, the Ceno-Tethys oceanic plate subducted beneath Southeast Sundaland, giving rise to coeval volcanism in the Meratus Mountains and the surrounding areas. Dispersion of some terranes in Southeast Sundaland occurred in the Paleogene through successive rifting and the opening of the Makassar Straits and the Flores Sea, with an eastern drift of South Sulawesi and Sumba away from Southeast Kalimantan to their present positions. Prior to the dispersion, the Meratus Mountains, South Sulawesi, and Sumba (called here the Trilogy of Southeast Sundaland) were united or adjacent to each other and underwent similar Late Cretaceous volcanism. The Late Cretaceous Volcanics and/or Volcanic-Clastics are therefore the common marker of their union. Our field studies in 2018-2019 at Sumba, South Sulawesi, and the Meratus Mountains (South Kalimantan) in the program, called the “Trilogy of Southeast Sundaland Terranes,” sampled the Late Cretaceous volcanics/ volcanic-clastics in these areas to prove that they were once united. Petrographic, petrochemical, isotopic, and geochronological data of the rock formations, based on the recent and previous analyses, show that these rocks, in the three terranes, are co-genetic spatially and temporally thus indicating their previous unity. The paired Paleogene dispersions of South Sulawesi from South Kalimantan, and successively Sumba from South Sulawesi, had resulted in rifted structures in the present Makassar Straits, the Flores Sea, and offshore Sumba. The rifted structures contain source rocks, reservoirs, seals, and structural-stratigraphic traps. Oil has been discovered therein, so further exploration is required since these objectives have not been sufficiently explored in the past and are thus still interesting.

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