Article
Geosciences, Multidisciplinary
J. Naranjo-Vesga, J. F. Paniagua-Arroyave, A. Ortiz-Karpf, Z. Jobe, L. Wood, P. Galindo, L. Shumaker, D. Mateus-Tarazona
Summary: Submarine canyons are major conduits for sediment transfer from continental shelf to deep marine environments. The morphology of each canyon type is controlled by the interaction between continental sediment supply, mass failures, shelf width, and fault occurrence. Seafloor topography influences the size of submarine fan deposits at the mouths of canyons, with larger fans on the continental rise and smaller fans in piggyback sub-basins. Our analysis of downdip canyon morphology and associated deposits can be used to predict the development of submarine canyons and associated fans in convergent tectonic margins worldwide.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Cooper R. Fasulo, Kenneth D. Ridgway
Summary: Detrital zircon U-Pb ages from sediment in major rivers of south-central Alaska reveal several major episodes of magmatism associated with the tectonic growth of this convergent margin. The spatial and temporal relationship of felsic magmatism along the entire northern Cordilleran margin is demonstrated, with topography and zircon fertility influencing the presence of detrital zircon populations in individual watersheds. The study highlights the faithful recording of Mesozoic and Paleogene magmatic events by regionally integrated detrital zircon populations from modern trunk rivers.
Article
Geochemistry & Geophysics
A. L. Stevens Goddard, J. C. Fosdick, M. Calderon, M. C. Ghiglione, R. A. VanderLeest, B. W. Romans
Summary: Thermochronologic data from zircon fission track and (U-Th)/He analysis in the southern Patagonian Andes reveal new patterns of Paleogene rock cooling and help reconstruct deformational and erosional events. The Path Family Approach is utilized to filter plausible thermal solutions based on structural and tectonic context. The results suggest a period of out-of-sequence deformation in the western domain and contemporaneous exhumation beyond the basin margins in the central domain, providing new insights into the tectonic evolution of the orogen.
Article
Geology
Chih-Tung Chen, Ching-Hua Lo, Pei-Ling Wang, Li-Hung Lin
Summary: Late brittle extension is a common feature in orogenic belts, and its relationship with crustal thickening, topography building, and rock exhumation is crucial in determining its role in orogenic development. By studying the structural evolution of Taiwan, it was found that the initiation of brittle tensile structures coincided with accelerated rock exhumation and molasse deposition, suggesting that syn-collisional brittle extension may play a significant role in both enhanced exhumation and orography formation.
Article
Geology
Chih-Tung Chen, Ching-Hua Lo, Pei-Ling Wang, Li-Hung Lin
Summary: In the active arc-continent collision of Taiwan, the initiation of brittle tensile structures coincided with rock exhumation acceleration and molasse deposition, suggesting a possible facilitator of augmented extrusive exhumation and orographic formation.
Article
Geosciences, Multidisciplinary
R. A. Glen, R. A. Cooper
Summary: New insights into the Late Precambrian-latest Devonian evolution of the Pacific margin of Gondwana reveal three key tectonic elements, suggesting that convergence along the margin was essentially simultaneous and showing possible trajectories of offshore terranes.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geology
Richard O. Lease, Peter J. Haeussler, Robert C. Witter, Daniel F. Stockli, Adrian M. Bender, Harvey M. Kelsey, Paul B. O. Sullivan
Summary: The Fairweather fault in southeastern Alaska is the fastest-slipping intracontinental strike-slip fault on Earth. It plays a key role in localizing Yakutat-North America plate motion, with varying exhumation rates and extreme rock uplift rates identified through radiometric dating data at a restraining double bend. This fault accommodates all Pacific-North America relative plate motion and stabilizes highly localized plate boundary strike slip with persistent extreme rock uplift rates within the bend.
Article
Geosciences, Multidisciplinary
Gery Herbozo, Oscar Ancco
Summary: Gas flares have been discovered in the Talara Basin along the northern Peru margin, with 78% occurring along the shelf and 22% between the shelf break and upper slope. These flares are mostly found within the oxygen minimum zone and above the gas hydrate stability zone. The largest gas flare is correlated with bottom-simulating reflections and landward-dipping strata, suggesting natural gas seepage from the seafloor in other parts of the Peru margin.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Qing Ye, Lianfu Mei, Dapeng Jiang, Xinming Xu, Efstratios Delogkos, Lili Zhang, Giovanni Camanni
Summary: This study reveals the 3-D structure of the Kaiping Metamorphic Core Complex (KP MCC) and its associated detachment fault using high-resolution 3-D seismic reflection data. The KP MCC is characterized by the ascend of ductile midcrustal materials and the partially exhumed KP9 High. The KP detachment fault displays a domed low-angle geometry with pronounced NS-plunging corrugations. The data also provide evidence for the kinematic process of the rolling-hinge activity and suggest that the presence of a pre-existing midcrustal ductile layer and basement structures within the upper brittle crust favored the development of the KP MCC in the northern South China Sea margin.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geology
Clarke DeLisle, Brian J. Yanites, Chia-Yu Chen, J. Bruce H. Shyu, Tammy M. Rittenour
Summary: Most landscape evolution models suggest that extreme rainfall leads to river incision, but in steep landscapes, landslides triggered by rainfall can actually slow down incision by increasing sediment delivery and aggradation. This study conducted a natural experiment in southern Taiwan to understand the effects of extreme rainfall on landscape response. The findings show that steep areas experienced widespread sediment aggradation during a typhoon, while less steep areas did not show noticeable aggradation. The study highlights the significance of dynamic sediment cover in landscape evolution and provides insights into how erosional efficiency may decrease in tectonically active landscapes as steepness increases.
Article
Geology
Guillermo Espejo-Bautista, Fernando Ortega-Gutierrez, Luigi A. Solari, Roberto Maldonado, Yuly T. Valencia-Morales
Summary: This paper presents a detailed study of the Sierra de Juarez Complex (SJC) in southern Mexico, revealing different lithological units and corresponding geologic events, indicating its complex geological history and its relation to the geological evolution of NW Gondwana.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geography
Lorenzo Dulcetta, Michel Faure, Philippe Rossi, Gabriele Cruciani, Marcello Franceschelli
Summary: This study investigates the Zicavo Metamorphic Complex in southern Corsica, which is part of the innermost Axial Zone of the Corsica-Sardinia Variscan belt. A 1:5000 geological map, along with new structural/microstructural and petrographic data, is used to analyze its geological and structural outline. The complex consists of three tectonic units separated by ductile shear zones. It has undergone multiple phases of deformation and metamorphism.
Article
Geochemistry & Geophysics
Cornelius O. Schwarze, Nina Kukowski
Summary: Understanding the mechanics of outer forearcs, influenced by the frictional properties of the plate interface, is crucial for studying natural hazards like earthquakes and slumping. Previous research suggests that the Hikurangi margin offshore New Zealand exhibits variable mechanics along its length. However, the relationship between the morphology of the submarine margin and the plate boundary's effective decollement strength is not fully understood. Using gridded data of surface slope and plate dip, this study characterizes the central and northern Hikurangi margin and reveals significant regional variability in the effective decollement strength of the Pacific-Australian plate boundary.
Article
Geosciences, Multidisciplinary
K. S. Anoop, Y. Anilkumar, M. Santosh, Bing Yu, K. Delna Joy, K. Kavyanjali, Ajana Sathyan, Anjana Mathew, K. S. Sajinkumar
Summary: This study reports the presence of a layered intrusion at the northern margin of the Coorg Block and investigates its magmatic and metamorphic evolution, as well as the collisional event between the Coorg Block and the Dharwar Craton.
Article
Geology
Arezoo Moradi, Nahid Shabanian, Ali Reza Davoudian, Hossein Azizi, Jose Francisco Santos, Yoshihiro Asahara
Summary: The studied granitic gneiss bodies in the Golpayegan metamorphic complex in western Iran have been dated to the Late Neoproterozoic period (Ediacaran) at approximately 557 +/- 12 Ma, which is concurrent with the Neoproterozoic-Early Paleozoic basement in other parts of Iran. Geochemical analysis suggests that the protolith of the gneisses corresponds to differentiated I-type granites with subalkaline compositions. The results also indicate that the granitic source magma evolved in an active continental margin tectonic regime during the subduction of the Proto-Tethys ocean beneath the northern margin of Gondwana, similar to other contemporaneous Cadomian fragments.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geochemistry & Geophysics
Paul M. Bremner, Mark P. Panning, R. M. Russo, Victor Mocanu, A. Christian Stanciu, Megan Torpey, Sutatcha Hongsresawat, John C. VanDecar, Todd A. LaMaskin, D. A. Foster
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Geology
Chong Ma, David A. Foster, Willis E. Hames, Paul A. Mueller, Mark G. Steltenpohl
Article
Geosciences, Multidisciplinary
Ce Wang, Xinquan Liang, David A. Foster, Xirong Liang, Le Zhang, Ming Su
GEOPHYSICAL RESEARCH LETTERS
(2019)
Article
Geosciences, Multidisciplinary
Ce Wang, Xinquan Liang, David A. Foster, Xirong Liang, Chuanxin Tong, Ping Liu
Article
Geosciences, Multidisciplinary
Ben Goscombe, David A. Foster, Richard Blewett, Karol Czarnota, Ben Wade, Bruce Groenewald, David Gray
PRECAMBRIAN RESEARCH
(2019)
Article
Geochemistry & Geophysics
Wenyuan Zhang, Kyoungwon Min, Scott E. Bryan, David A. Foster, Christopher R. Fielding, Charlotte Allen, Aidan Kerrison
Article
Geosciences, Multidisciplinary
E. Osorio-Granada, A. Pardo-Trujillo, S. A. Restrepo-Moreno, F. Gallego, J. Munoz, A. Plata, R. Trejos-Tamayo, F. Vallejo, A. Barbosa-Espitia, F. J. Cardona-Sanchez, D. A. Foster, G. Kamenov
Article
Geochemistry & Geophysics
Angel A. Barbosa-Espitia, George D. Kamenov, David A. Foster, Sergio A. Restrepo-Moreno, Andres Pardo-Trujillo
Article
Geochemistry & Geophysics
Nikita Kepezhinskas, George D. Kamenov, David A. Foster, Pavel Kepezhinskas
Article
Geochemistry & Geophysics
C. Antoine, E. Bruand, M. Guitreau, J-L Devidal
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2020)
Review
Geosciences, Multidisciplinary
Ben Goscombe, David A. Foster, David Gray, Benjamin Wade
Review
Geosciences, Multidisciplinary
Ben Goscombe, David A. Foster, David Gray, David Kelsey, Ben Wade
Article
Geosciences, Multidisciplinary
Chong Ma, David A. Foster, Paul A. Mueller, Barbara L. Dutrow, Jeffery Marsh
Summary: This study provides insights into regional metamorphism, partial melting, and crustal thickening in the Idaho batholith segment through the analysis of whole-rock geochemistry, zircon trace element compositions, U-Pb dating, and structural analysis. Four magmatic events are identified, with multiple generations of felsic magmatism sourced from progressively more evolved crustal components. The episodic magmatism recorded melt migration in a mid-crustal setting at ca. 100-92 Ma and additional magma ascent in an upper-crustal setting at ca. 77 Ma. The crust of the Cordilleran hinterland underwent significant thickening from ca. 100-84 Ma, reaching Andean-like thickness by ca. 84 Ma.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Geochemistry & Geophysics
Christian Nicollet, Jean-Louis Paquette, Emilie Bruand, Valerie Bosse, Ines Pereira
Summary: The Chenaillet ophiolite in France represents a preserved portion of the alpine ocean, with gabbros forming lenticular bodies intruding serpentinites. Petrology reveals details of the massif's cooling process, with retrograde temperatures ranging from 950 to 500 degrees Celsius. Thermal modeling suggests that a 150m thick gabbro massif can crystallize and cool within a few hundred to several thousand years.
Article
Geochemistry & Geophysics
Ines Pereira, Emilie Bruand, Christian Nicollet, Kenneth T. Koga, Alberto Vitale Brovarone
Summary: This study investigates the natural occurrence and chemistry of Ti-bearing minerals in gabbroic rocks and basalts that record different degrees of metamorphism. It is found that rutile is stable at lower pressure in ocean-floor amphibole-bearing gabbros than previously thought, and can be chemically distinguished from LP rutile. Titanite, instead of rutile, is stable in blueschist metagabbros from the Western Alps and eclogitic metabasalts from Corsica. These findings can be useful for studying the HP metamorphic record using detrital Ti-bearing minerals.
JOURNAL OF PETROLOGY
(2023)