Article
Geochemistry & Geophysics
Kristijan Rajic, Hugues Raimbourg, Vincent Famin, Benjamin Moris-Muttoni, Donald M. Fisher, Kristin D. Morell, Aurelien Canizares
Summary: We conducted a structural study on the Kodiak accretionary complex in Alaska, USA to understand its thermal structure and the processes of exhumation. The complex consists of tectonic melanges and coherent units, with melanges characterized by shear deformation and coherent units affected by horizontal shortening. Our findings indicate peak temperatures ranging from 220 to 400 degrees C, with the highest temperatures recorded in the central part of the complex. Based on structural and thermal data, we conclude that the rocks in the Kodiak complex experienced stages of burial and exhumation, with vertical motions reaching up to 13 km. The exhumation resulted from prism thickening and surficial erosion.
Article
Geochemistry & Geophysics
Kristijan Rajic, Hugues Raimbourg, Vincent Famin, Benjamin Moris-Muttoni, Donald M. Fisher, Kristin D. Morell, Aurelien Canizares
Summary: A study on the structural and thermal characteristics of the Kodiak accretionary complex in Alaska, USA suggests that the complex experienced two stages of burial and exhumation. The study also reveals a dome-like structure in the central part of the complex and records subsidence episodes along the southeastern border. The rates of vertical motion in the complex are comparable to estimates in modern margins.
Article
Geochemistry & Geophysics
Alicia M. Cruz-Uribe, F. Zeb Page, Emilie Lozier, Maureen D. Feineman, Thomas Zack, Regina Mertz-Kraus, Dorrit E. Jacob, Kouki Kitajima
Summary: Garnet from an amphibolitized eclogite block in California shows complex growth patterns with similarities in composition between vein and matrix garnet. Major and trace element zoning in garnet reveals multiple growth stages, while oxygen isotope analyses suggest late-stage growth involved interaction with serpentinites.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Geology
David A. Bero, Owen A. Anfinson, Loren A. Raymond
Summary: New geologic mapping of the Franciscan Complex in the western Mt. Tamalpais area northwest of San Francisco, California, reveals a tectonostratigraphic stack of accretionary units that young westward and structurally downward. The provenance of sediment is predominantly from the Sierra Nevada arc to the east, with minor contributions from Paleozoic and Precambrian sources. The geological character of the Mt. Tamalpais area is complex, with unusual post-accretion thrust faults and atypical greenschist facies metamorphism.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geochemistry & Geophysics
Kohtaro Ujiie, Keisuke Ito, Ayaka Nagate, Hiroki Tabata
Summary: The study of pseudotachylyte in a Jurassic chert-clastic complex in central Japan reveals key characteristics of seismic slip in deeper portions of subduction zones, suggesting that slip is localized along black carbonaceous mudstone. Intensely fractured wall rocks may influence the generation of frictional melt and acceleration of seismic slip.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Miguel Cisneros, Whitney M. Behr, John P. Platt, Robert Anczkiewicz
Summary: By using quartz-in-garnet elastic barometry, we have constrained the formation pressures of eclogites from different locations, suggesting that these rocks may have originated from similar structural levels.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2022)
Article
Geochemistry & Geophysics
Xinyu Liu, Min Zeng, Chenwei Li, Si Chen, Tianyuan Li
Summary: The Mugagangri Group in Tibet is a significant research target for understanding the subduction and accretion history of the Meso-Tethys Ocean. By studying the fluid inclusions within crack-seal veins, we gain insight into the characteristics and movement pathways of fluids in the shallow subduction zone, which play a role in the accretion processes.
Article
Geosciences, Multidisciplinary
William L. Schmidt, John P. Platt
Summary: This study examines the mechanics of accretion within a fossil subduction zone in the Eastern Belt of the Franciscan Complex, revealing the role of pressure solution and dislocation creep in deformation, shear stress distribution, and strain rates during the deformation process. The results indicate that pressure solution and dislocation creep operate with similar strain rates, progressively differentiating and favoring dislocation creep, with dilational microcracking associated with pressure solution potentially producing microseismic events. The concatenation of these events could explain phenomena such as tremor bursts and slow slip events on a larger scale.
JOURNAL OF STRUCTURAL GEOLOGY
(2022)
Article
Geology
David A. Bero, Owen A. Anfinson, Loren A. Raymond
Summary: The authors corrected and revised the data for western Mt. Tamalpais, corrected several errors, and provided a revised version of the data. They also mentioned that they do not agree with the alternative views on some geological issues in the Comment document, stating that their main conclusions remain unchanged.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geosciences, Multidisciplinary
Xu-Dong Guo, Lin Ding, Andrew K. Laskowski, Hou-Qi Wang, Upendra Baral, Deng Zeng, Xiang-Li Ding, Ya-Hui Yue, Jing Xie, Fu-Long Cai
Summary: Accretionary complexes in the Yarlung-Zangpo suture zone were studied to understand the subduction history and source-to-sink system. Field mapping and analyses of detrital zircon ages and trace elements were conducted on sandstones from the Cretaceous Bainang accretionary complex. The results revealed the provenance of sediments from the eastern part of the Gangdese arc and the central-northern Lhasa terrane, as well as the existence of the ancestral Lhasa River and a local north-south-flowing river system.
Article
Geology
Carolina Ortiz-Guerrero, Camilo Montes, David W. Farris, Catalina Agudelo, Margarita Ariza Acero, Juliana Ayala, Jose David Avellaneda, Alejandro Cortes-Calderon, Esteban Gaitan, Sebastian Garzon, Daniel Gongora-Blanco, Nubia Andrea Jara, Juan Camilo Meza-Cala, Lina Perez-Angel, Nathalia Pineda-Rodriguez, Alejandro Rodriguez-Parra, Billy Revelo-Obando, Carolina Rubiano, Elena Stiles, Maria Paz Urdaneta, Nicolas Zuluaga, Felipe Lamus, Federico Moreno, Aldo Rincon
Summary: Detailed geologic mapping and a gravity survey in the western Azuero Peninsula discovered two faulted and folded slivers of oceanic crust attached to the trailing edge of the Caribbean Large Igneous Plateau (CLIP). The ophiolite in western Azuero is composed of two tectonic slivers arranged in thrust faults that stack various basalt and chert sequences. The formation of these slivers resulted from the collision and accretion of Galapagos seamounts against the trailing edge of the CLIP.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geochemistry & Geophysics
Xin-Shui Wang, Reiner Klemd, Ji-Lei Li, Jun Gao, Tuo Jiang, Ke-Qing Zong, Sheng-Chao Xue
Summary: The Wuwamen accretionary complex in the Chinese South Tianshan provides important insights into the architecture and evolution of the Central Asian Orogenic Belt. Geochemical and age data indicate diverse origins for the exotic blocks within the complex. The accretionary processes in the complex were active from the early Ordovician to the late Carboniferous. These findings underscore the significant control of long-lasting accretionary processes and terminal collision on the southwestern CAOB.
Article
Geosciences, Multidisciplinary
Qiang Qiu, Sylvain Barbot
Summary: This study investigates the structural control on tsunami generation during seismic rupture propagation by analyzing high-resolution bathymetry, seismic reflection profiles, and tsunami-earthquake rupture models at global subduction zones. The researchers find that tsunami run-ups correlate with the width of the outer wedge of the frontal accretionary prism, which is made up of active faults. The prevalence of high-angle faults in the outer wedge provides a more efficient mechanism for seafloor uplift and tsunami wave excitation. This research is important for assessing seismic and tsunami hazards at subduction zones, especially in identified seismic gaps.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Samuele Papeschi, Paola Vannucchi, Takehiro Hirose, Keishi Okazaki
Summary: This study documents the existence of an exhumed plate boundary shear zone, known as the Norsi-Cavo Complex (NCC), which developed during the early stages of the Apennines in Northern Italy. The NCC is composed of oceanic sediments and serpentinites and is continuously exposed on the island of Elba. The authors interpret the formation of the NCC as a result of material transfer from the upper plate to the subduction channel through tectonic erosion at the base of the prism. The findings suggest that the NCC formed during eastward subduction of the Ligurian Ocean and ceased when the continental margin entered the subduction.
Article
Geochemistry & Geophysics
Atsushi Noda, Fabien Graveleau, Cesar Witt, Frank Chanier, Bruno Vendeville
Summary: This study investigates the architectural evolution of natural accretionary wedges using sandbox analog modeling. The results suggest that the wedge is formed by repeated episodic frontal accretion, and the configuration of the decollement layer plays a crucial role in controlling the accretion cycle and fault network.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Loren A. Raymond, David A. Bero
Review
Geology
Loren A. Raymond, Arthur Merschat, R. Kelly Vance
INTERNATIONAL GEOLOGY REVIEW
(2016)
Article
Geology
Loren A. Raymond
INTERNATIONAL GEOLOGY REVIEW
(2017)
Review
Geology
Loren A. Raymond
INTERNATIONAL GEOLOGY REVIEW
(2018)
Article
Geology
Yoonhae Ha, Haemyeong Jung, Loren A. Raymond
INTERNATIONAL GEOLOGY REVIEW
(2019)
Article
Geosciences, Multidisciplinary
Loren A. Raymond, Fred Webb, Anthony B. Love
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2012)
Article
Geology
Loren A. Raymond
INTERNATIONAL GEOLOGY REVIEW
(2015)
Review
Geosciences, Multidisciplinary
Loren A. Raymond
Article
Geology
David A. Bero, Owen A. Anfinson, Loren A. Raymond
Summary: New geologic mapping of the Franciscan Complex in the western Mt. Tamalpais area northwest of San Francisco, California, reveals a tectonostratigraphic stack of accretionary units that young westward and structurally downward. The provenance of sediment is predominantly from the Sierra Nevada arc to the east, with minor contributions from Paleozoic and Precambrian sources. The geological character of the Mt. Tamalpais area is complex, with unusual post-accretion thrust faults and atypical greenschist facies metamorphism.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geology
David A. Bero, Owen A. Anfinson, Loren A. Raymond
Summary: The authors corrected and revised the data for western Mt. Tamalpais, corrected several errors, and provided a revised version of the data. They also mentioned that they do not agree with the alternative views on some geological issues in the Comment document, stating that their main conclusions remain unchanged.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Review
Geosciences, Multidisciplinary
Loren A. Raymond