Article
Geochemistry & Geophysics
Hanchao Jian, Juan Pablo Canales, K. W. Helen Lau, Mladen R. Nedimovic
Summary: This study used seismic profiling and inversion techniques to investigate the crustal and upper mantle structure offshore northeastern Nova Scotia, revealing the importance of magmatism in the processes of rift development and seafloor spreading. The results show that even at magma-poor margins, magmatism plays a significant role in the lithospheric breakup and onset of oceanic spreading.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Pauline Chenin, Gianreto Manatschal, Jean-Francois Ghienne, Peng Chao
Summary: The research on rifted margins reveals that stratigraphic horizons cannot simply be correlated from proximal to distal domains, leading to the proposal of a new tectono-stratigraphic model. By studying the spatio-temporal evolution during rifting and identifying specific characteristics of different rift domains, such as periods of active deformation and depositional environments, the study emphasizes the importance of an iterative approach between fieldwork and geophysical studies for a better understanding of rifted margins. This approach also highlights the need to abandon outdated beliefs and routines when interpreting seismic sections and outcrops.
Article
Geosciences, Multidisciplinary
Xiaojun Zhou, Weizhen Tian, Guanghui Wu, R. Damian Nance, Yongquan Chen, Yawen Zhao, Wei Yan, Yanqiu Zhang
Summary: Neoproterozoic rifting on the northern margin of the supercontinent Rodinia, such as in the Tarim Craton, was triggered by subduction processes, as evidenced by the formation of granitoids in a subduction-induced rift setting.
PRECAMBRIAN RESEARCH
(2022)
Article
Geography, Physical
Jian-Jun Fan, Yaoling Niu, An-Bo Luo, Chao-Ming Xie, Yu-Jie Hao, Hai-Yong Liu
Summary: This study examines the timing of the opening of the Meso-Tethys Ocean by analyzing detrital zircons from Upper Carboniferous-Upper Permian strata on the Tibetan Plateau. The data suggests a significant change in sedimentary provenance around 280-260 million years ago, indicating the opening of the Meso-Tethys Ocean.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geology
Jian-Jun Fan, Bo-Chuan Zhang, Yaoling Niu, An-Bo Luo, Yu-Jie Hao
Summary: This study investigates the rifting and opening process of the Meso-Tethys Ocean by analyzing the sedimentary rocks in the Carboniferous-Permian Shiquanhe stratigraphic succession. The data reveal a significant change in depositional setting from tectonically stable to tectonically active during the Early-Middle Permian period. This indicates a diachronous opening of the Meso-Tethys Ocean.
Article
Geosciences, Multidisciplinary
Feng-Hui Zou, Cai-Lai Wu, Li-Huan Deng, Dong Gao, Yuan-Hong Gao
Summary: The Xiangpishan complex in the NE Tibetan Plateau is a composite concentric pluton consisting of a felsic core surrounded by different types of rocks. Petrogenetic analysis shows that the felsic rocks were emplaced during the Late Permian, while the gabbros are younger. The study also suggests that the interaction between the asthenosphere and lithosphere played a crucial role in the formation of the complex.
GEOLOGICAL JOURNAL
(2023)
Article
Geology
Po Wan Wong, Ivar Midtkandal, Jan Inge Faleide
Summary: The presence of paired extension-compression (PEC) structures in the early Paleogene continental rift in the northeast Atlantic suggests its crucial role in termination of propagation and rift-mode conversion.
Article
Geosciences, Multidisciplinary
Wubamlak Nigussie, Kevin Mickus, Derek Keir, Abera Alemu, Yoseph Muhabaw, Ameha A. Muluneh, Esubalew Yehualaw, Zelalem Demissie
Summary: In magma-rich continental rifts, extension is commonly localized as dike injection in discrete magmatic segments which appear from surface geology to mimic the along-axis segmentation of ocean ridges. The subsurface morphology of these zones of localized magma injection remains unclear, including their depth range and relationship with tectonic faulting. Using gravity data, the study of the Main Ethiopian Rift reveals discrete Bouguer gravity highs in the centers of right-stepping magmatic segments, suggesting the presence of mafic intrusions. The study also suggests strong along-axis variations in deformation mechanism, with magma injection accommodating extension at the segment centers and faulting dominating towards the segment ends. Rift margin volcanic zones are inferred near the rift flanks.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geochemistry & Geophysics
A. A. Tsygankov, V. B. Khubanov, O. Udoratina, M. A. Coble, G. N. Burmakina
Summary: The Mongolian-Transbaikalian volcanoplutonic belt in northern Mongolia and Transbaikalia hosts hundreds of plutons formed between 280-270 and 230-210 Ma, including the giant Sherbakhta pluton consisting of AFS syenites and peralkaline granites. The isotopic and geochemical characteristics suggest that the parental melt underwent fractional crystallization to form residual ferroan peralkaline graniticmelt in an intermediate chamber. This A-type granitoids in the Transbaikalia region formed in an intracontinental geodynamic setting due to the impact of a mantle plume on the heated plastic crust of a young orogen.
Article
Geosciences, Multidisciplinary
Benjamin Sautter, Manuel Pubellier
Summary: A comparative study of basement structures, basins geometry, and evolution in Southeast Asia reveals an intrinsic relationship between crustal inherited structures and deformation over time. The pattern of basin structure and development is conditioned by the intrinsic crustal configuration of Southeast Asia, specifically the Triassic and Cretaceous orogenic structures.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Natasha Stanton, Andres Gordon, Cassia Cardozo, Nick Kusznir
Summary: The Abrolhos Magmatic Province (AMP) is located in the Ocean Continent Transition (OCT) of the Brazilian South Atlantic rifted margin, formed in the Early Cenozoic as part of a hotspot track. The volcanic edifices in the AMP seem to follow preexisting structural trends and show influence of lithosphere inheritance. The magmatic activity continued into the Neogene, connected with the VTC, suggesting a distinct mantle thermal structure under the AMP and VTC.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Karine Zuccolan Carvas, Paulo Marcos de Paula Vasconcelos, Leila Soares Marques, Teresa Ubide, Isabela de Oliveira Carmo, Marly Babinski
Summary: Laser incremental-heating geochronology of whole-rock fragments and minerals from primitive subalkaline mafic dykes in the Cabo Frio Tectonic Domain, southeastern Brazil, reveals a complex combination of intrusive ages, apparent ages affected by excess argon, and ages that record late-stage hydrothermal alteration. The study suggests a link between magmatic activity and generation of fluid circulation cells along the margin and adjacent sedimentary basins, showing evidence for pervasive hydrothermal re-setting of the K-Ar system.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geosciences, Multidisciplinary
Luizemara Soares Alves Szameitat, Monica Heilbron, Maria Alice Nascimento Fagundes de Araga, Gianreto Manatschal, Francisco Jose Fonseca Ferreira, Alessandra de Barros Silva Bongiolo, Anderson Costa dos Santos, Webster Ueipass Mohriak
Summary: Rift systems in the central South Atlantic and the southern Northern Atlantic margins exhibit anomalous wide ocean-continent transitions, extreme thinning of the continental crust, and scarce volcanism indicative of low magmatic budgets during rifting and breakup, characteristic of magma-poor rifted margins. Seismic tomography and electromagnetic data reveal the differences in lithospheric mantle characteristics between the Iberian and Angola margins and the Newfoundland and SE-Brazil margins. The observations suggest the presence of an anomalous mantle and a weaker, newly formed mantle beneath the respective margins.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Review
Geosciences, Multidisciplinary
Zhong-Hai Li, Fengyuan Cui, Shuting Yang, Xinyi Zhong
Summary: Tethys tectonic system has experienced a complex evolution history with multiple Wilson cycles, making it an ideal target for studying plate tectonics and geodynamics. The evolution of the Tethys is characterized by the separation, drift, collision, and accretion of continental blocks. The opening and closing of Tethys oceans at different stages are considered crucial for its evolution. This study highlights and analyzes four key geodynamic processes during the Tethyan evolution to gain insights.
SCIENCE CHINA-EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Shihao Hao, Lianfu Mei, Xiong Pang, Laurent Gernigon, Douglas Paton, Jinyun Zheng, Qing Ye, Zhichao Zhou, Ye Zhong
Summary: Based on seismic data and borehole data from the Pearl River Mouth Basin, the study investigates the detachment fault systems and syn-rift magmatism in the Baiyun and Liwan Sags in the northern South China Sea. The Baiyun Sag is mainly constrained by detachment faults, while the Liwan Sag is a sag-type basin with magmatic domes. The northern South China Sea experienced four phases of rift-related magmatism, and the crustal thinning in the Baiyun Sag is controlled by detachment fault, while in the Liwan Sag, it is mainly controlled by preferential thinning of the lower crust.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2023)