Results 21 to 30 of about 38,057 (315)

Volcanic Rocks in the Keewatin [PDF]

Science, 1894
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openaire   +2 more sources

Isotopic Age of the Xiong’er Group Volcanic Rocks and Its Geological Significance in Western Henan, China

Geofluids, 2022
The Xiong’er Group is mainly distributed in western Henan, southern Shanxi, and southeastern Shaanxi. As a set of low-grade metamorphic and low-deformation volcanic rocks formed in the transition period during the tectonic evolution of the North China ...
Wenchao Dong, Xucheng Pang, Weixun Qu, Guangshun Hou   +3 more
doaj   +1 more source

Grain-size distribution of volcaniclastic rocks 1: A new technique based on functional stereology [PDF]

, 2012
The power of explosive volcanic eruptions is reflected in the grain size distribution and dispersal of their pyroclastic deposits. Grain size also forms part of lithofacies characteristics that are necessary to determine transport and depositional ...
Proussevitch, A.A., Allen, S. R., Jutzeler, M., Allen, Sharon R., Jutzeler, Martin, Prusevich, Alexander A., Allen, S.R., Proussevitch, Alex A.   +7 more
core   +1 more source

Petrological and Geochemical Constraints on the Origin of Early Cretaceous Volcanic Rocks in the Central‐East Asia: Implications for Crustal Growth and Evolution

Geochemistry, Geophysics, Geosystems, 2018
New petrological and geochemical data for Early Cretaceous volcanic rocks in the North China Craton (NCC) combined with published data of cotemporaneous volcanic rocks in the NCC and eastern Central Asian Orogenic Belt (ECAOB) are used to understand ...
Sheng‐Ping Qian, Zhong‐Yuan Ren, Le Zhang, Lei Zhang, Ya‐Dong Wu, Sheng‐Wang Mei, Xiao‐Bo Xu, Qing‐Chen Luo   +7 more
doaj   +1 more source

A Comparative Study on Microscopic Characteristics of Volcanic Reservoirs in the Carboniferous Kalagang and Haerjiawu Formations in the Santanghu Basin, China

Frontiers in Earth Science, 2021
Self-jetting high-yield oil flow was obtained from Ma 67 and Ma 36 wells drilled in the volcanic reservoirs of the Haerjiawu Formation in the Santanghu Basin, China. This has shifted the prospectors’ attention to the Haerjiawu Formation from the Kalagang
Weiming Wang, Weihao La, Tanguang Fan, Xiongfei Xu, Yingnan Liu, Qixia Lv   +5 more
doaj   +1 more source

Constraints on Early Paleozoic Deep‐Ocean Oxygen Concentrations From the Iron Geochemistry of the Bay of Islands Ophiolite

Geochemistry, Geophysics, Geosystems, 2022
The deep ocean is generally considered to have changed from anoxic in the Precambrian to oxygenated by the Late Paleozoic (∼420–400 Ma) due to changes in atmospheric oxygen concentrations.
Daniel A. Stolper, Xiaofei Pu, Max K. Lloyd, Nikolas I. Christensen, Claire E. Bucholz, Rebecca A. Lange   +5 more
doaj   +1 more source

Timing, origin and emplacement dynamics of mass flows offshore of SE Montserrat in the last 110 ka: implications for landslide and tsunami hazards, eruption history, and volcanic island evolution [PDF]

, 2013
Mass flows on volcanic islands generated by volcanic lava dome collapse and by larger volume flank collapse, can be highly dangerous locally and may generate tsunamis that threaten a wider area.
Leng, M. J., Watt, S., F L, Fisher, J.K., Moreton, S.,, Leng, M.J., Talling, P.,, Hart, M.B., Le Friant, A., Fisher, J. K., Hart, M., B, Hart, M.,, Trofimovs, J., Hart, M. B., Talling, P.J., Talling, P., J., Moreton, S., G, Smart, C., Fisher, J., K, Leng, M., Moreton, S.G., Watt, S.,, Sparks, R.S.J., Watt, S. F. L., Smart, C. W., Cassidy, M., Cassidy, M.; id_orcid, Watt, S.F.L., Fisher, J.,, Smart, C.W., Sparks, R, S J, Sparks, R. S. J., Smart, C., W, Sparks, R,, Smart, C.,, Moreton, S. G., Talling, P. J.   +35 more
core   +1 more source

Geochronology and Geochemistry of Late Paleozoic Volcanic Rocks and Their Relationship With Iron and Molybdenum Deposits in Xilekuduk Area, Northern Margin of Junggar

Frontiers in Earth Science, 2021
A large number of intermediate basic volcanic rocks and porphyry Cu-Mo deposits as well as volcanic-hosted magnetite deposit have been recently discovered in the Xilekuduk area.
Xiaofeng Wei, Hao Wei, Zhen Liao, Zhiwei Wang, Dong Li, Qigui Mao, Xiao Li   +6 more
doaj   +1 more source

Geological characteristics of early cretaceous volcanic rocks and analysis of metallogenic potential of uranium mineralization in Moganshan basin, northern Zhejiang province, China

Frontiers in Earth Science
The Moganshan Volcanic Basin is located in the northeastern section of the Ganhang volcanic-tectonic-uranium polymetallic metallogenic belt. To explore the uranium mineralization potential of these volcanic rocks, petrographic, elemental geochemical ...
Xiaolong Wang, Xiaolong Wang, Wengao Zhang, Wengao Zhang, Shenghong Cheng, Bo Wang, Yifei Tang, Wei Li   +7 more
doaj   +1 more source

Middle Neoproterozoic syn-rifting volcanic rocks in Guangfeng, South China: petrogenesis and tectonic significance [PDF]

, 2008
Middle Neoproterozoic igneous rocks are widespread in South China, but their petrogenesis and tectonic implications are still highly controversial.
Li, W., Li, X., Li WX, Li XH, Li, Zheng-Xiang, Li ZX   +5 more
core   +1 more source