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Tianxiao Ji and Zhigang Zeng
Mid-ocean ridge basalts (MORBs), produced at mid-ocean ridge where the continents and subduction zones are distant, are the product of partial melting of the upper mantle and their chemical composition can provide information about the mantle itself. The...
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Wenxi Chen, Xifang Liu, Yuanyi Zhao and Yongjie Lin
The Qinghai?Tibet Plateau (QTP) hosts significant lacustrine sedimentary boron-rich deposits, with the Xiongba Basin being a prominent region housing two large sedimentary boron-rich deposits. These deposits are closely associated with extensive Neogene ...
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Olive L. Ponyalou, Michael G. Petterson and Joseph O. Espi
Feni is located at the southeastern end of the NW-trending Tabar?Lihir?Tanga?Feni (TLTF) volcanic island chain, in northeastern Papua New Guinea. This island chain is renowned for hosting alkaline volcanics, geothermal activity, copper?gold mineralizatio...
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Gustavo W. Bertotto, Maurizio Mazzucchelli, Tommaso Giovanardi, Rommulo V. Conceiçao, Alberto Zanetti, Manuel E. Schilling, Mauro I. Bernardi, Alexis D. Ponce, Tiago Jalowitzki, Fernanda Gervasoni and Anna Cipriani
Huanul is a shield volcano with several lava flows hosting mantle xenoliths erupted during the Pleistocene (0.84 ± 0.05 Ma). It is located in the southern part of the Payenia Volcanic Province, which is among the largest Neogene-Quaternary volcanic provi...
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Trevor J. Falloon, Kaj Hoernle, Bruce F. Schaefer, Ilya N. Bindeman, Stanley R. Hart, Dieter Garbe-Schonberg and Robert A. Duncan
Lava samples from the Christmas Island Seamount Province (CHRISP) record an extreme range in enriched mantle (EM) type Sr-Nd-Pb-Hf isotope signatures. Here we report osmium isotope data obtained on four samples from the youngest, Pliocene petit-spot phas...
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Takashi Ninomiya, Shoichi Shimoyama, Sho Taniguchi, Toshihiro Takahashi, Tohru Danhara and Hideki Iwano
The Tsushima Lapilli Tuff, the thickest tuff in the Taishu Group on Tsushima Island, underwent a thermal event after deposition, and has not previously yielded a reliable age because various ages have been reported. This study clarifies the eruption age ...
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Alba Patrizia Santo
The Tuscany Magmatic Province consists of a Miocene to Pleistocene association of a wide variety of rock types, including peraluminous crustal anatectic granites and rhyolites, calcalkaline and shoshonitic suites and ultrapotassic lamproites. In addition...
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Valentina Magni, John Naliboff, Manel Prada and Carmen Gaina
Back-arc basins in continental settings can develop into oceanic basins, when extension lasts long enough to break up the continental lithosphere and allow mantle melting that generates new oceanic crust. Often, the basement of these basins is not only c...
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Denisse de la Fuente,Óscar Figueroa,Daniel Demaiffe,Mauricio Mella,Paul Duhart,David Quiroz,Jorge Muñoz,Verónica Oliveros
Pág. 24 - 53
Upper Cretaceous intrusives of limited extent crop out in the Coastal Cordillera near of Valdivia (39º48? S), 100 km west of the main topographic divide of the Andean Cordillera. Given that plutonic rocks of the same age crop out at the same latitudes in...
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Michael W. Förster, Yannick Bussweiler, Dejan Prelevic, Nathan R. Daczko, Stephan Buhre, Regina Mertz-Kraus and Stephen F. Foley
Subduction of oceanic crust buries an average thickness of 300?500 m of sediment that eventually dehydrates or partially melts. Progressive release of fluid/melt metasomatizes the fore-arc mantle, forming serpentinite at low temperatures and phlogopite-b...
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