Article
Geochemistry & Geophysics
Christian Schiffer, Alexander L. Peace, Scott Jess, Stephane Rondenay
Summary: In this study, we collected seismic data from the Northwest Atlantic margins and used inversion methods to determine the velocity models of the crust and uppermost mantle. By integrating these results with existing crustal models and seismic data, we were able to gain insights into the crustal structure and evolution of the Northwest Atlantic. We also identified the possible origins and spatial extent of high velocity lower crust and its relationship with the Davis Strait Igneous Province and other geological features.
Article
Geochemistry & Geophysics
C. Peirce, J. C. Tedd, R. W. Hobbs
Summary: This study investigates the structure and dynamics of the Ecuador Fracture Zone using multiple geophysical data types. Gravity modelling reveals a low-density crust beneath the fracture zone and an anomalously low-density region in the uppermost mantle. Normal faults bound the median ridges within the fracture zone, offsetting the seabed and documenting multiple phases of relative uplift. The study also observes active extensional faulting and serpentinization in the Costa Rica Rift crust. Contrary to the assumption that fracture zones are tectonically inactive, the Ecuador Fracture Zone provides evidence of extension, ongoing serpentinization, and relative uplift.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
B. A. Heath, E. E. E. Hooft, D. R. Toomey, M. Paulatto, C. B. Papazachos, P. Nomikou, J. Morgan
Summary: In volcanic arcs like the Aegean, tectonic processes have a significant control on magmatism, with regional-scale tectonic stresses leading to oriented faulting across the region. Local-scale faults/fractures do not necessarily correlate with magmatic features, indicating that regional processes have a greater impact on magmatism than local features. The alignment of magmatic features shows strong tectonic control, suggesting that magmatic processes are strongly influenced by regional-scale tectonic processes.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Shaohong Xia, Chaoyan Fan, Dawei Wang, Jinghe Cao, Fang Zhao
Summary: This study reveals the crustal structure of the Qiongdongnan Basin and the possible influence of the Hainan mantle plume. The results show slight to moderate crustal thinning in the Northern and Southern Rises of the basin, while the Central Depression exhibits hyperextension. The upper and lower crusts undergo brittle and ductile thinning, respectively. Furthermore, low-velocity conduits in the form of magmatic footprints of the Hainan mantle plume are identified in certain areas.
SCIENCE CHINA-EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
M. Ram Mohan, Neal J. McNaughton, D. Srinivasa Sarma, M. Rajamanickam, Ian R. Fletcher, Simon A. Wilde, Birger Rasmussen, Bryan Krapez, S. Balakrishnan
Summary: This study presents new SHRIMP U-Pb zircon and titanite ages, whole-rock geochemical and Sm-Nd isotopic data for granitoids in the Chitradurga Greenstone Belt. The results show that the growth of the belt is related to horizontal tectonics since at least 3.2 Ga.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
X. Zeng, Q. Cao, B. Wang, C. Hu, J. X. Tian, J. Zhu, X. Q. Ouyang
Summary: The petroleum system from Jurassic source rocks in Altyn piedmont has been deformed by Yanshan-Himalayan tectonic movement, leading to controversial spatial distribution and sedimentary system studies. Through seismic characterization, sedimentary analysis, and detrital zircon U-Pb dating, the study reveals that the Jurassic formation in Altyn piedmont can be divided into southern, middle, and northern parts, each with different provenances. The active Altyn fault system controls the spatial distribution of the Jurassic formation, making the northern deposition area a crucial target for gas exploration.
Article
Geochemistry & Geophysics
James Broermann, Richard A. Bennett, Corne Kreemer, Geoffrey Blewitt, Philip A. Pearthree
Summary: Rates of crustal deformation in the southern Basin and Range (SBR) and Colorado Plateau (CP) provinces are relatively low but can lead to large earthquakes due to the accumulation of strain over time. It is difficult to quantify deformation rates in these regions, but analysis has shown an anomalous high strain rate in southwestern Arizona, possibly due to unmodeled Pacific-North America plate boundary strain seeping into the study area.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
T. Naber, S. E. Grasby, J. P. Cuthbertson, N. Rayner, C. Tegner
Summary: Based on new geochemical and U-Pb chronology data, this study confirms the close relationship between the samples from Hansen Point and basaltic lavas, sills, and dykes from other locations in the Arctic region. The proposed Audhild Bay alkaline suite (ABAS) refers to volcanic occurrences in northern Ellesmere Island and other areas that share similar geochemical characteristics. The revision also suggests a possible correlation between the Hansen Point tholeiitic suite (HPTS) and the volcanic rocks of the Strand Fiord Formation, indicating their potential role in the Cretaceous Ocean Anoxic Event 2.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Multidisciplinary Sciences
Gang Lu, Ritske S. Huismans
Summary: This study investigates the formation mechanism of volcanic activity at rifted margins using numerical models, revealing a surprising correlation between magmatism and margin width, which differs from previous theories.
NATURE COMMUNICATIONS
(2021)
Article
Geology
Lydia R. Bailey, Jason Kirk, Sidney R. Hemming, Robert W. Krantz, Peter W. Reiners
Summary: This study reveals a widespread phase of fault-related fluid migration and mineralization in the Paradox Basin of the Colorado Plateau, USA. Through analyzing the K-Ar dates of clay-rich fault gouge, the researchers found statistically overlapping dates of authigenic illite formation on different faults, indicating a close temporal relationship between fault gouge formation, copper mineralization, and red-bed bleaching. This raises questions about the drivers of Eocene fluid flow.
Article
Geology
Yongjun Lu, Michael T. D. Wingate, Robert H. Smithies, Klaus Gessner, Simon P. Johnson, Anthony I. S. Kemp, David E. Kelsey, Peter W. Haines, David McB Martin, Laure Martin, Mark Lindsay
Summary: This study provides insights into the Proterozoic assembly of Australia and its importance for reconstructing Proterozoic supercontinents. The presence of a substantial domain of juvenile Proterozoic lithosphere, the Percival Lakes province, between the West Australian and North Australian cratons is identified. The study suggests that the convergence of the cratons was younger than Columbia amalgamation and that Proterozoic Australia formed during the earliest phases of Rodinia assembly.
Review
Geosciences, Multidisciplinary
Hamed Gamaleldien, Zheng-Xiang Li, Mohamed Abu Anbar, Brendan Murphy, Luc S. Doucet
Summary: The tectonic evolution of the Neoproterozoic Arabian-Nubian Shield (ANS) shows examples of crustal growth processes with multiple episodes of crustal formation and reworking. The magmatism within this region occurred in distinct time intervals and underwent a transition in tectonic and magmatic styles around 650 Ma.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
F. Secchi, T. Giovanardi, S. Naitza, M. Casalini, M. Kohut, A. M. Conte, G. Oggiano
Summary: The Sarrabus pluton is formed by multiple short-lived intrusions, involving heterogeneous sources of magmas. The magmatic activity is characterized by repeated invasions and the formation of intrusive units and rock dykes during tectonic exhumation.
Article
Geosciences, Multidisciplinary
Ajay Dev Asokan, M. Ram Mohan, Satya Narayana Mahapatro, Ravi Shankar, K. Rasheed
Summary: The Singhbhum Craton in eastern India provides important information about early earth processes. This study focuses on the Noamundi-Jamda-Koira IOG Basin in this region and presents evidence that indicates the significant assimilation of Paleoarchean granitoids in the formation of metavolcanic rocks. Additionally, the study suggests that the Jagannathpur volcanics should be considered as an extension of the WIOG metavolcanics rather than a separate unit.
PRECAMBRIAN RESEARCH
(2023)
Review
Geosciences, Multidisciplinary
Xu Zhao, Le-bing Fu, M. Santosh, Jun-hao Wei, Jia-jie Chen
Summary: This study investigates the spatiotemporal evolution of magmatism in the East Kunlun Orogen (EKO) during the Early Paleozoic and its significance in understanding the growth and reworking of continental crust. The results show that regional magmatism in the early compressional setting was dominated by I-type granitic rocks and mantle-derived mafic rocks, while the subsequent extensional setting saw the intrusion of large-scale mafic magma from the asthenosphere mantle into the lower continental crust. The different types of granitic rocks in these stages were derived from the reworking of various sources, such as crustal sediments, calc-alkaline granitoids, and mafic lower continental crust.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Magdalena A. Ellis, Jason B. Barnes, Joseph P. Colgan
Article
Geochemistry & Geophysics
Kathryn E. Watts, Matthew A. Coble, Jorge A. Vazquez, Christopher D. Henry, Joseph P. Colgan, David A. John
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Geosciences, Multidisciplinary
Joseph P. Colgan, Richard G. Stanley
Article
Geochemistry & Geophysics
Kathryn E. Watts, David A. John, Joseph P. Colgan, Christopher D. Henry, Ilya N. Bindeman, Axel K. Schmitt
JOURNAL OF PETROLOGY
(2016)
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Geochemistry & Geophysics
Magdalena A. E. Curry, Jason B. Barnes, Joseph P. Colgan
Article
Geosciences, Multidisciplinary
Joseph P. Colgan, David A. John, Christopher D. Henry, Kathryn E. Watts
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2018)
Article
Geochemistry & Geophysics
Joseph P. Colgan, Christopher D. Henry, David A. John
Article
Geology
Joseph P. Colgan
Article
Geosciences, Multidisciplinary
Joseph P. Colgan, Anne E. Egger, David A. John, Brian Cousens, Robert J. Fleck, Christopher D. Henry
Article
Geosciences, Multidisciplinary
Christopher D. Henry, Nicholas H. Hinz, James E. Faulds, Joseph P. Colgan, David A. John, Elwood R. Brooks, Elizabeth J. Cassel, Larry J. Garside, David A. Davis, Steven B. Castor
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Geosciences, Multidisciplinary
Johan De Grave, Stijn Glorie, Mikhail M. Buslov, Daniel F. Stockli, Michael O. McWilliams, Vladislav Yu. Batalev, Peter Van den Haute
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Geochemistry & Geophysics
Joseph P. Colgan, Keith A. Howard, Robert J. Fleck, Joseph L. Wooden
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Geochemistry & Geophysics
B. R. Hacker, Peter B. Kelemen, Matthew Rioux, Michael O. McWilliams, Philip B. Gans, Peter W. Reiners, Paul W. Layer, Ulf Soderlund, Jeffrey D. Vervoort
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Geochemistry & Geophysics
Joseph P. Colgan, Darcy K. McPhee, Kristin McDougall, Jeremy K. Hourigan
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Geochemistry & Geophysics
V. E. Langenheim, R. C. Jachens, R. W. Graymer, J. P. Colgan, C. M. Wentworth, R. G. Stanley