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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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David A. Foster and Ben D. Goscombe
Convergent plate margins where large turbidite fans with slivers of oceanic basement are accreted to continents represent important sites of continental crustal growth and recycling. Crust accreted in these settings is dominated by an upper layer of recy...
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Jiahao Li, Xing Ding and Junfeng Liu
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Sebastian Viehmann
The Hf-Nd isotope systems are coupled in magmatic systems, but incongruent Hf weathering (‘zircon effect’) of the continental crust leads to a decoupling of the Hf-Nd isotope systems in low-temperature environments during weathering and erosi...
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Chaoyang Li, Pengyao Zhi, Renwei Ding, Lihong Zhao, Wei Gong, Zhonghua Li and Jiayu Ge
This study combines surface heat flow, multi-channel seismic reflection profiles, and ocean-bottom seismometer (OBS) profiles to determine the thermo-rheological structure of the Qiongdongnan Basin (QDNB) and Pearl River Mouth Basin (PRMB), with the aim ...
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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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Hans-J. Gotze,Michael Schmitz,Peter Giese,Sabine Schmidt,Peter Wigger,Gerhard Schwarz,Manuel Araneda,Guillermo Chong,Jose Viramonte
Pág. 179 - 192
RESUMEN. Se presentan los resultados de investigaciones sismicas, magnetoteluricas y gravimetricas en bs Andes centrales australes (20-26°S) durante la decada de los 80. Los datos estructurales permiten deducir una fuerte asimetria en la litosfera del or...
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Nick Petford,Michael P. Atherton
Pág. 235 - 243
ABSTRACT. The Abancay Deflection (13°S) is a continental trench-normal structure that marks the northern limit of the central volcanic zone in Peru, The northern limit of exposed Precambrian basement, and the continental extension of the oceanic Nazca Ri...
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Hans-J. Gotze,Michael Schmitz,Peter Giese,Sabine Schmidt,Peter Wigger,Gerhard Schwarz,Manuel Araneda,Guillermo Chong,Jose Viramonte
Pág. 179 - 192
RESUMEN. Se presentan los resultados de investigaciones sismicas, magnetoteluricas y gravimetricas en bs Andes centrales australes (20-26°S) durante la decada de los 80. Los datos estructurales permiten deducir una fuerte asimetria en la litosfera del or...
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Nick Petford,Michael P. Atherton
Pág. 235 - 243
ABSTRACT. The Abancay Deflection (13°S) is a continental trench-normal structure that marks the northern limit of the central volcanic zone in Peru, The northern limit of exposed Precambrian basement, and the continental extension of the oceanic Nazca Ri...
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David W. Szymanski, Lina C. Patino, Thomas A. Vogel and Guillermo E. Alvarado
Over the last forty years, research has revealed the importance of magma mixing as a trigger for volcanic eruptions, as well as its role in creating the diversity of magma compositions in arcs. Sensitive isotopic and microchemical techniques can reveal s...
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O. Adrian Pfiffner
This paper gives an overview of the large-scale tectonic styles encountered in orogens worldwide. Thin-skinned and thick-skinned tectonics represent two end member styles recognized in mountain ranges. Both styles are encountered in former passive margin...
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Joshua P. Taylor, Laura E. Webb, Cari L. Johnson and Matthew J. Heumann
The Central Asian Orogenic Belt, or Altaids, is an amalgamation of volcanic arcs and microcontinent blocks that records a complex late Precambrian?Mesozoic accretionary history. Although microcontinents cored by Precambrian basement are proposed to play ...
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Gary S. Michelfelder, Todd C. Feeley, Alicia D. Wilder and Erik W. Klemetti
To better understand the origin of across-strike K2O enrichments in silicic volcanic rocks from the Andean Central Volcanic Zone, we compare geochemical data for Quaternary volcanic rocks erupted from three well-characterized composite volcanoes situated...
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Charles R. Stern
Pág. 161 - 206
The Andean volcanic arc includes over 200 potentially active Quaternary volcanoes, and at least 12 giant caldera/ignimbrite systems, occurring in four separate segments referred to as the Northern, Central, Southern and Austral Volcanic Zones. Volcanism ...
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Daniel Tormey,Paulina Schuller,Leopoldo Lopez-Escobar,Frederick Frey
Pág. 165 - 175
This is a two part study of recent lavas Irom the Southern Volcanic Zone (SVZ) of the Andes (33-46°S). In the first part, radioactive equilibrium between 238U and 230Th was tested by analyzing 9 samples from historic eruptions for 230Th/232Th activity ra...
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Enrico Capezzuoli, Amalia Spina, Andrea Brogi, Domenico Liotta, Gabriella Bagnoli, Martina Zucchi, Giancarlo Molli and Renzo Regoli
The Pre-Mesozoic units exposed in the inner Northern Apennines mostly consist of Pennsylvanian-Permian successions unconformably deposited on a continental crust consolidated at the end of the Variscan orogenic cycle (Silurian-Carboniferous). In the inne...
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Stefan Lüth,Peter Wigger
Pág. 83 - 101
The results of a seismic refraction profile across the Southern Andes at 39°S from the Chilean Pacific coast to the Argentinean Neuquén Basin are presented here. A 2-D crustal velocity model was derived from traveltime forward modeling of the correlated ...
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Henrik Drake, Magnus Ivarsson and Christine Heim
The oceanic and continental lithosphere constitutes Earth?s largest microbial habitat, yet it is scarcely investigated and not well understood. The physical and chemical properties here are distinctly different from the overlaying soils and the hydrosphe...
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Kent C. Condie
Zircon age peaks at 2100?1650 and 1200?1000 Ma correlate with craton collisions in the growth of supercontinents Nuna and Rodinia, respectively, with a time interval between collisions mostly <50 Myr (range 0?250 Myr). Collisional orogens are two types: ...
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