Results 11 to 20 of about 446 (178)

Geochemistry and emplacement environment of intrusive bodies of Shele Boran Mo-Cu deposit (Northeast of Ahar, East Azarbaijan) [PDF]

پترولوژی
IntroductionMolybdenum-copper deposit of Shele boran is located in East-Azarbaijan province, northeast of Ahar. The area is dominated by the oldest rocks including Paleocene-Eocene andesitic-dacitic units into which Oligocene sub-volcanic intrusions have
Seyed Ghafour Alavi, Mansour Kazemi rad, Mohsen Moayyed, Mohammad Reza Hosseinzadeh   +3 more
doaj   +3 more sources

TiO2 Content and the Shoshonite and Alkaline Associations

Nature Physical Science, 1972
THERE are two distinct genetically unrelated “alkaline” magma series. First, there is the alkaline association proper which occurs on oceanic islands, continental margins and continental rift systems. Second, there is the characteristically potassic shoshonite association1, which typically appears in the later stages of island arc evolution2.
S. E. KESSON, I. E. SMITH
openaire   +2 more sources

Genetic relations of shoshonitic and absarokitic magmas, Absaroka Mountains, Wyoming

Journal of Volcanology and Geothermal Research, 1979
The nature, origin, and tectonic significance of shoshonitic volcanism is currently the subject of widely differing views. In the type locality in the Absaroka Range, the rocks consist of a diverse group of lavas, all of Mid-Eocene age. High in the volcanic pile are subordinate volumes of absarokite and shoshonite flows, both of which contain calcic ...
D.E. Gest, A.R. McBirney
openaire   +2 more sources

Evaluation of granitic rocks as feldspar source: Al Madinah, Western Part of Saudi Arabia

Journal of Taibah University for Science, 2018
The source of the feldspar is found in the Late-Precambrian granitoid rocks of Al Madinah area, which covers about 2000 km2 within a 44,000 km2 area of the western part of Saudi Arabia.
Mousa Gougazeh, Abdallah Bamousa, Adel Hasan   +2 more
doaj   +2 more sources

A review of the tectonic, volcanological and hazard history of Vulcano (Aeolian Islands, Italy)

Terra Nova, Volume 35, Issue 6, Page 471-487, December 2023., 2023
Abstract Vulcano is one of the seven volcanic islands composing the Aeolian Islands archipelago (Southern Italy), which also includes three other active volcanoes. The island was originally a stratovolcano like Stromboli; afterwards, its shape turned towards a complex structure composed of several volcanic landforms of different sizes.
Gianfilippo De Astis, Domenico M. Doronzo, Mauro A. Di Vito   +2 more
wiley   +1 more source

Was cratonic Asia deeply subducted beneath the Pamir? Evidence from P–T conditions and tectonic affinities of Cenozoic Pamir crustal xenoliths

Journal of Metamorphic Geology, Volume 41, Issue 7, Page 925-965, September 2023., 2023
Abstract One of the most striking geological features of the Pamir is the south‐dipping lithospheric slab beneath the orogen characterized by an intracontinental Wadati‐Benioff zone. A widely accepted hypothesis over the past 40 years interprets the slab to represent southward subducted cratonic Asian continental lithosphere, which predicts significant
Yi‐Peng Li, Lin Ding, Alexander C. Robinson, De‐Liang Liu, Jing Xie, Li‐Yun Zhang, Chen‐Yuan Zhao, Ya‐Hui Yue, Yiduo Liu, Ilhomjon Oimuhammadzoda, Mustafo Gadoev, Negmat Rajabov   +11 more
wiley   +1 more source

Developing a South Pacific tephra framework: Initial results from a Samoan Holocene sequence

Journal of Quaternary Science, Volume 38, Issue 6, Page 806-815, August 2023., 2023
ABSTRACT Tephra preserved in sediments form useful isochronous marker layers, linking disparate geological, palaeoenvironmental and archaeological records. The application of tephrochronology is greatly enhanced through the detection of macroscopically invisible tephra (cryptotephra). Here, we identify two discrete cryptotephra in Samoan lake sediments,
Anna J. Bourne, David A. Sear, Pete G. Langdon, Shane J. Cronin   +3 more
wiley   +1 more source

Geochemistry and petrogenesis of Alamdar rhyolites from East of Tasouj town (Northwest of Iran) [PDF]

پترولوژی, 2018
The Alamdar rhyolite has been cropped out at the highest top of Mishow Mountain Ranges (i.e. Alamdar top), east of Tasouj. Considering that the rhyolite has been intruded the Kahar Formation, its Precambrian age is more probable. The constituent minerals
mohsen moayyed, robab hajialioghli
doaj   +1 more source

The Taverna San Felice Dike (NE of Roccamonfina Volcano): Unraveling Magmatic Intrusion Processes and Volcano‐Tectonics in the Tyrrhenian Margin of the Southern Apennines

Geochemistry, Geophysics, Geosystems, Volume 24, Issue 8, August 2023., 2023
Abstract The Roccamonfina volcano is located within the Garigliano Graben (southern Apennines, Italy) and has been active throughout the Middle‐Late Pleistocene. Along its polyphase volcanic history (630–55 ka), including several caldera‐forming eruptions (385–230 ka), several effusive/mildly explosive monogenetic events occurred along the volcano ...
Jacopo Natale, Stefano Vitale, Guido Giordano, Lorenzo Fedele, Federico Lucci, Alessandro Vona, Ernesto Paolo Prinzi, Francesco D’Assisi Tramparulo, Roberto Isaia, Sabatino Ciarcia   +9 more
wiley   +1 more source

K‐Rich Adakite‐Like Rocks in Central Tibet: Fractional Crystallization of a Hydrous, Alkaline Primitive Melt

Geophysical Research Letters, Volume 50, Issue 10, 28 May 2023., 2023
Abstract K‐rich adakite‐like rocks (KARs) in post‐collisional settings, such as in Tibet, have been widely linked with the melting of pre‐existing thickened crust. Here, we investigate geochemical data of the Late Eocene (38–34 Ma) volcanic rocks including KARs from the southern Qiangtang terrane (SQT) of central Tibet.
Wei Xu, Roberto F. Weinberg, Shi‐Hong Tian, Zeng‐Qian Hou, Zhu‐Sen Yang, Lu Chen, Feng Lai   +6 more
wiley   +1 more source