Results 21 to 30 of about 5,229 (211)

PETROGRAPHIC AND GEOCHEMICAL CONSTRAINTS ON TECTONIC SETTINGS OF THE BIRIMIAN SUPERGROUP VOLCANIC ROCKS, EVIDENCE FROM NEW DROBO ENVIRONS SOUTH OF JAMAN DISTRICT IN THE BONO REGION OF GHANA [PDF]

Malaysian Journal of Geosciences, 2022
The petrographic and geochemical studies of Birimian Supergroup meta-volcanic rocks in the New Drobo environs in Ghana help to decipher the tectonic settings at the study area.
Matthew Coffie Wilson, Geoffrey Chiri Amedjoe, Simon Kafui Yao Gawu   +2 more
doaj   +1 more source

Experimental Study on Mechanical Properties of Daciteunder the Unloading Condition of a HydropowerStation

Renmin Zhujiang, 2020
In order to study the mechanical properties of dacite under the unloading condition, thispaper selects the dacite in the lower dam of a hydropower station in southwest China as the researchobject, obtains the stress-strain curve under the unloading ...
LI Wancai, DENG Hui, DING Zhonghui, LU Bifeng, HAO Hao, LI Anrun, SU Hang   +6 more
doaj  

Petrography, Geochemistry and tectonomagmatic setting of Tertiary volcanic rocks in Ebrahim abad area(southwest of Gazik), Southern Khorasan [PDF]

پترولوژی, 2019
Volcanic rocks are observed in Ebrahim abad area, southwest of Gazik and in southern Khorasan province that located in northern part of the Sistan suture zone. The studied lavas consist of basaltic andesite, andesite and dacite with Eocene to Miocene age
Neda Amirteymoori, Seyyed Saeid Mohammadi, Malihe Nakhaei   +2 more
doaj   +1 more source

Geochemical types of subvolcanic dacite – rhyolite complexes from the сentral part of the Vedlozero-Segozero greenstone belt (Karelian Craton)

Transactions of the Karelian Research Centre of the Russian Academy of Sciences, 2018
The paper presents the results of detailed geological, petrographic and geochemical studies of Archean acidic subvolcanic rocks from the Koikary domain located in the central part of the Vedlozero-Segozero greenstone belt.
Максим Александрович Гоголев, Maxim Gogolev   +1 more
doaj   +1 more source

Formation of ferroan dacite by lunar silicic volcanism recorded in a meteorite from the Moon

Progress in Earth and Planetary Science, 2020
An igneous clast from the Northwest Africa 773 (NWA 773) clan of lunar meteorites formed by silicic volcanism on the Moon. The clast was identified in Northwest Africa 2727 (NWA 2727), which is included in the NWA 773 clan.
Hiroshi Nagaoka, Timothy J. Fagan, Masahiro Kayama, Yuzuru Karouji, Nobuyuki Hasebe, Mitsuru Ebihara   +5 more
doaj   +1 more source

Volcanogenic Turonian and epiclastics of senonian in the Timok magmatic complex between Bor and the Tupižnica mountain, eastern Serbia [PDF]

Geološki Anali Balkanskoga Poluostrva, 2005
In the light of the findings presented in this paper, among the volcanic products of the Upper Cretaceous, referred to as "the first volcanic phase" (Drovenik, 1961), two lithostratigraphic units can be singled out within the Timok Magmatic Complex (TMC):
Đorđević Miodrag
doaj   +1 more source

Remoção de Pb2+ e Cr3+ em solução por zeólitas naturais associadas a rochas eruptivas da formação serra geral, bacia sedimentar do Paraná Removal of Pb2+ and Cr3+ from aqueous solution by natural zeolites associated with eruptive rocks from the serra geral formation, Paraná sedimentary basin

Química Nova, 2009
The capacity of natural zeolites and its host rock (dacite) to remove Pb2+ and Cr3+ from aqueous solutions has been investigated. Results showed that both samples prefer to remove Pb2+ instead of Cr3+.
Mirian Chieko Shinzato, Tarcísio José Montanheiro, Valdecir de Assis Janasi, Sandra Andrade, Jorge Kazuo Yamamoto   +4 more
doaj   +1 more source

Geochemistry and Geochronology of Magmatic Rocks in Southwestern and Northeastern Cambodia: Implications for the Tectonic Evolution and Metallogenesis of the Loei Fold Belt

Geological Journal, EarlyView.
The composition of intrusive rocks suggests that the magma was likely generated in a subduction‐related setting. The arc crustal thickness in the Phnom Sro Ngam and Halo Prospects was probably < 40 km during emplacement. Zircon U–Pb age range indicates a correlation with Loei Fold Belt magmatic activity.
Sirisokha Seang, Khin Zaw, Kakda Kret, Ivan Belousov, Kotaro Yonezu, Koichiro Watanabe, Charles Makoundi   +6 more
wiley   +1 more source

Metamorphic rocks from the north-eastern part of the Ereendavaa terrane (Eastern Mongolia) :

Mongolian Geoscientist, 2021
In this paper, we have conducted geochronological and geochemical studies on the metamorphic rocks of the Khaychingol and Ereendavaa Formations in the Mogoitiin Gol, Khaychin Gol and Emgentiin Bulag areas from the Ereendavaa terrane and these rocks have ...
Tserendash Narantsetseg, Yuan Chao, Wang Tao, Ren Zhongyuan, Li Pengfei, Zhang Le, Guo Lei, Tong Ying, Demberel Orolmaa, Altanbaatar Battushig, Orosoo Baatarchuluun, Tuya Idermunkh, Jargalsaikhan Tumendelger   +12 more
doaj   +1 more source

Late Pleistocene Volcanic Rocks From Tengchong Volcanic Field at SE Tibetan Plateau: Constraints on Petrogenesis and Mantle and Crustal Processes

Geological Journal, EarlyView.
Early zircon saturation and crystallisation occur in mafic (52–54 wt.% SiO2) lavas at Tengchong volcanic field. These early formed zircons with high δ18O (6.6‰–7.9‰) indicates mantle enrichment by subducted supracrustal materials. ABSTRACT Late Pleistocene (< 0.2 Ma) mafic and evolved volcanic rocks occur in northern Tengchong Volcanic Field, SE ...
Lizhu Wang, Haibo Zou
wiley   +1 more source