Review
Geology
Biao Gao, Jitao Chen, Wenkun Qie, Xiangdong Wang
Summary: The Baoshan, Tengchong, Lhasa, South Qiangtang, and Sibumasu terranes were part of Gondwana before separating and moving away from the northern margin in the Early Permian. The paleopositions of these terranes during the late Paleozoic are still debated, which hampers the understanding of the tectonic evolution of the PaleoTethys and glacier distribution patterns on eastern Gondwana during the late Paleozoic ice age. Through analysis of detrital zircon U-Pb dating and Hf isotope signatures, this study proposes a new paleogeographic model that suggests the South Qiangtang, Baoshan, and part of Sibumasu were located outside the northern margin of Indian Gondwana, while the Lhasa and Sumatra terranes were along the northern margin of Australia. Based on shifts in provenance of late Paleozoic glaciogenic sedimentary rocks, the study also hypothesizes the development of two main ice sheets during the late Paleozoic. This research contributes to the understanding of the late Paleozoic tectonic and paleoclimatic history of Gondwana.
SEDIMENTARY GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
A. S. Tabaud, P. Stipska, S. Mazur, K. Schulmann, J. Mikova, J. Wong, M. Sun
Summary: The study of rocks samples from GSM in Poland, using geochemistry and isotopic data, revealed the origin and geological evolution of sedimentary rocks in the area, suggesting that it may have been located along the northern periphery of the Gondwana margin, forming in the middle to late Cambrian period.
Article
Geosciences, Multidisciplinary
Morteza Derakhshi, Richard E. Ernst, Sandra L. Kamo
Summary: This study reports for the first time a series of voluminous intraplate volcanic events in Iran, which may be a key factor contributing to the Late Ordovician mass extinction (LOME). The volcanic events occurred during the initial rifting of the Paleotethys Ocean and have been identified through fieldwork and dating techniques. The researchers suggest that these volcanic activities represent remnants of a newly proposed Large Igneous Province (LIP) and played a significant role in the environmental and climatic changes associated with LOME.
Article
Geochemistry & Geophysics
Ashley W. Provow, Dennis L. Newell, Carol M. Dehler, Alexis K. Ault, W. Adolph Yonkee, Stuart N. Thomson, Kevin H. Mahan
Summary: The study reveals that the maximum depositional age of the volcanic member of the Brown's Hole Formation in northern Utah, USA, is 613 +/- 12 million years, providing new constraints on the timing and tempo of deposition of underlying and overlying units. The results suggest a reevaluation of the origins of regional unconformities previously attributed to global glaciation events, and inform the timing of rift-related magmatism and sedimentation near the western margin of Laurentia.
Review
Geosciences, Multidisciplinary
Ed Landing, J. Duncan Keppie, D. Fraser Keppie, Gerd Geyer, Stephen R. Westrop
Summary: Avalonia is a distinctive region defined by unique uppermost Ediacaran-Ordovician rocks. It has been determined that Avalonia was an insular microcontinent rather than a part of Gondwana, with its origin and movement linked to the Avalonian transform fault (Atf). This finding challenges previous paleogeography and plate tectonics models.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
A. Al-Juboury, J. P. Howard, S. J. Vincent, G. Nichols
Summary: Through various analysis methods, the study shows that the sandstones of the Khabour Formation in western Iraq have been affected by multiple diagenetic processes, resulting in the formation of secondary porosity and fractured porosity in the reservoir.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geochemistry & Geophysics
J. Gregory Shellnutt, Jaroslav Dostal
Summary: The Meguma terrane is a special unit in the Northern Appalachians that is only found in Nova Scotia. It was thrust over the Avalon terrane during the Early Devonian Acadian Orogeny and is likely exotic to North America. The relationship between the two terranes is uncertain, and little is known about their basement rocks. This study investigates xenoliths found in the Meguma terrane dyke, which provide insights into the nature of the lower crust of the Northern Appalachians. By analyzing the zircon U-Pb ages of a dioritic xenolith, the researchers determined its origin and found that it is compositionally similar to granitoids from an active continental margin. The discovery of Early Paleoproterozoic zircons suggests the possible existence of Paleoproterozoic rocks in the basement of the Avalon terrane.
Article
Geosciences, Multidisciplinary
Gregory J. Walsh, John N. Aleinikoff, Robert A. Ayuso, Robert P. Wintsch
Summary: The Quinebaug-Marlboro belt in southeastern New England poses a challenge to plate reconstructions due to its high-grade rocks, but through integrated mapping, geochronology, and geochemistry, researchers have been able to unravel its temporal and spatial history. The presence of Ediacaran to Cambrian metamorphosed volcanic and intrusive rocks dated between ca. 540-500 Ma suggests a complex geological evolution, with detrital zircons indicating deposition between ca. 485-435 Ma and a mixture of mantle and continental crust sources. The geochemistry points to a correlation with terranes in Maine and Maritime Canada, highlighting a possible modern analog in the Mariana arc-rifting zone.
Article
Geosciences, Multidisciplinary
Jerzy Nawrocki, Jaromir Leichmann, Magdalena Panczyk
Summary: The study suggests that the magmatic intrusions in the Brno Massif belong to a bimodal type and began penetrating since the mid-Ediacaran period. The paleomagnetic data support this view and indicate a common drift history between this region and Baltica.
PRECAMBRIAN RESEARCH
(2021)
Review
Geosciences, Multidisciplinary
Maren Vormann, Wilfried Jokat
Summary: The East African Rift was formed as a result of the Jurassic/Cretaceous dispersal of Gondwana, with the Davie Fracture Zone (DFZ) creating a major shear zone along East Africa. The structural changes along the DFZ from a raised continental block in the south to non-elevated basement covered by sediments in the north are clearly documented. By compiling geological/geophysical knowledge and interpreting it in the context of kinematic reconstructions, a better understanding of the structural variability in East Africa has been achieved.
GEO-MARINE LETTERS
(2021)
Article
Plant Sciences
Mohammad Ghavidel-Syooki, Mohammad Hossein Piri-Kangarshahi
Summary: A siliciclastic succession in eastern-central Iran was analyzed to determine its age and paleogeographic position. The results indicate that during the Late Ordovician, Iran was part of the peri-Gondwana domain. This is supported by the presence of well-known chitinozoan species in the sedimentary succession.
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2021)
Article
Geochemistry & Geophysics
Hongyi He, Zhi Chen, Zhaofei Liu, Zihan Gao, Le Hu, Chang Lu, Junjie Shao, Ying Li
Summary: It is confirmed that soil gas geochemistry, including Rn and CO2 fluxes, can serve as reliable indicators for fault activity. In this study, the relationships among soil gas Rn and CO2 fluxes, hydrochemistry of hot springs, and fault activity along the Xiaojiang Fault Zone in SW China were thoroughly investigated. The results indicate that the types of hot spring water were affected by the interactions with groundwater and carbonate rocks. The concentrated distribution of relatively high soil gas Rn and CO2 fluxes in the northern and southern segments of the fault zone corresponded with the spatial distribution of seismic activities and fault slip rate.
APPLIED GEOCHEMISTRY
(2023)
Article
Geosciences, Multidisciplinary
Xiaozhen Li, Changqing Yin, Peng Gao, Donald W. Davis, Shun Li, Jian Zhang, Jiahui Qian, Yanling Zhang
Summary: This study presents the U-Pb dating, Hf isotope, geochemistry, and isotopic composition of potassic felsic porphyries from western Yunnan in the Sanjiang Region. The results indicate that these porphyries were emplaced during 36-33 Ma and could be produced by partial melting of mafic rocks in a thickened lower crust. The study also suggests that delamination of lithospheric mantle and asthenosphere upwelling played important roles in the Cenozoic magmatic activities in the region.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Moonsup Cho, Wonseok Cheong, W. G. Ernst, Yoonsup Kim, Keewook Yi
Summary: The study sheds light on the Paleozoic paleogeography of East Gondwanan terranes, particularly the North China Craton, using new data from sandstones in the Taebaeksan Basin, Korea. It reveals the vestige of coeval arc magmatism and significant changes in provenance, possibly linked to variations in paleowater depths. Detrital zircons with distinct distribution patterns suggest a connection to the proto-Japan arc and indicate a sedimentary influx from contemporaneous volcanic activity.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Geosciences, Multidisciplinary
Simon Couzinie, Pierre Bouilhol, Oscar Laurent, Thomas Grocolas, Jean-Marc Montel
Summary: This study provides a detailed description of the Cezarenque-Joyeuse gneiss complex in the Cevennes parautochthon domain of the French Massif Central, revealing its formation age, origin, and geological significance. The results indicate that these gneisses are primarily Furongian-Lower Ordovician volcanic rocks and associated volcaniclastic rocks, while the leucogneisses are finer grained microgranite dykes originally intrusive within the volcanic edifices. Zircon dating and geochemical analysis provide further evidence.
BSGF-EARTH SCIENCES BULLETIN
(2022)
Article
Geosciences, Multidisciplinary
T. S. Paulsen, J. Encarnacion, A. M. Grunow, V. A. Valencia, P. W. Layer, M. Pecha, E. Stump, S. Roeske, S. Thao, C. Rasoazanamparany
Article
Geology
T. Paulsen, J. Encarnacion, A. Grunow, M. Pecha
NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS
(2016)
Article
Geology
Timothy S. Paulsen, John Encarnacion, Anne M. Grunow, Edmund Stump, Mark Pecha, Victor A. Valencia
JOURNAL OF GEOLOGY
(2018)
Article
Geology
Margaret D. Thompson, Jahandar Ramezani, Anne M. Grunow
JOURNAL OF GEOLOGY
(2018)
Article
Geosciences, Multidisciplinary
M. D. Thompson, S. M. Barr, A. M. Grunow
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2012)
Article
Geosciences, Multidisciplinary
T. S. Paulsen, J. Encamacion, A. M. Grunow, V. A. Valencia, M. Pecha, P. W. Layer, C. Rasoazanamparany
Article
Geology
Timothy Paulsen, John Encarnacion, Anne Grunow, Victor A. Valencia, Christine Rasoazanamparany
JOURNAL OF GEOLOGY
(2008)
Article
Geochemistry & Geophysics
Anke S. Wendt, Alan P. M. Vaughan, Fausto Ferraccioli, Anne M. Grunow
Article
Geology
Timothy Paulsen, John Encarnacion, Anne M. Grunow, Victor A. Valencia, Mark E. Pecha, Jeffrey Benowitz, Paul Layer
Summary: New age data from the Queen Maud Mountains in the Ross orogenic belt of Antarctica reveal that plutonism primarily occurred during the Cambrian to Ordovician periods, with polymodal age distributions consistent with regional magmatic flare-ups along the Pacific-Gondwana margin. Deformed plutons indicate deformation during the Cambrian to Ordovician periods, transitioning to post-tectonic magmatism and cooling at around 509-470 Ma. This suggests that the Queen Maud-Horlick Mountains share a similar petrotectonic history with other regions along the Pacific-Gondwana margin, providing new evidence for their tectonic evolution.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geochemistry & Geophysics
Joaquin Bastias, Richard Spikings, Teal Riley, Alexey Ulianov, Anne Grunow, Massimo Chiaradia, Francisco Herve
Summary: The Late Triassic - Jurassic igneous rocks of the Antarctic Peninsula and Patagonia provide evidence for the evolution of the margin of southwestern Gondwana. The study reveals four main magmatic pulses occurring between approximately 225-145 Ma, all consistent with a continental arc setting. This magmatic evolution is driven by active margin processes related to the break-up of Gondwana.
Article
Geosciences, Multidisciplinary
T. S. Paulsen, J. Encarnacion, A. M. Grunow, P. W. Layer, M. Watkeys
Review
Geosciences, Multidisciplinary
M. D. Thompson, A. M. Grunow, J. Ramezani
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2007)
Article
Geosciences, Multidisciplinary
S. W. Vogel, S. Tulaczyk, S. Carter, P. Renne, B. Turrin, A. Grunow
GEOPHYSICAL RESEARCH LETTERS
(2006)
Article
Geography, Physical
LE Babcock, AM Grunow, GR Sadowski, SA Leslie
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2005)