Passive magmatism on Earth and Earth-like planets

Li, Sanzhong; Li, Xiyao; Zhou, Jie; Cao, Hong; Liu, Lijun; Liu, Yiming; Sun, Guangyi; Suo, Yanhui; Li, Yang; Yu, Shengyao; Jiang, Zhaoxia

doi:10.1016/j.geogeo.2021.10.003

Cited by 33 publications

(6 citation statements)

References 188 publications

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“…The significance of the interplay between mantle dynamics and stress and strain distribution within the crust, which controls transcrustal magma distribution, has been highlighted by studies, conducted in different tectonic settings, which we briefly outline in the following. On a global scale, processes initiating magma supply can be categorized to be either (a) bottom‐up controlled through active mantle upwelling and the influence of hot buoyant mantle plumes or (b) top‐down controlled through tectonic processes initiating convection and thus passive magma upwelling (e.g., Li et al., 2022). However, on a local scale either magmatic or tectonic processes might exercise greater control on the lithosphere.…”

Section: Discussionmentioning

confidence: 99%

Insights on the Interplay of Rifting, Transcrustal Magmatism and Formation of Geothermal Resources in the Central Segment of the Ethiopian Rift Revealed by 3‐D Magnetotelluric Imaging

et al. 2023

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The East African Rift system (EARS) is a prominent continental rift that shaped the landscape of East Africa, including the East African Plateau, rift valleys and numerous volcanoes. Rifting and rift-related volcanism in East Africa played a role in early human evolution (King & Bailey, 2006) and to this date affect the life of humans due to volcanic hazards (Biggs et al., 2021), but also by providing rift-associated natural resources, including geothermal energy resources (Benti et al., 2023;Burnside et al., 2021). A large number of studies, especially in the northern part of the EARS, which includes the Main Ethiopian Rift (MER), have provided a wealth of information Abstract The Main Ethiopian Rift is accompanied by extensive volcanism and the formation of geothermal systems, both having a direct impact on the lives of millions of inhabitants. Although previous studies in the region found evidence that asthenospheric upwelling and associated decompression melting provide melt to magmatic systems that feed the tectono-magmatic segments in the rift valley, there is a lack of geophysical models imaging these regional and local scale transcrustal structures. To address this challenge, we use the magnetotelluric method and image subsurface electrical conductivity to examine the magmatic roots of Aluto volcano, quantify and interpret the melt distribution in the crust considering established concepts of continental rifting processes and constrain the formed geothermal system. Specifically, we combined regional (maximum 30 × 120 km 2 ) and local (15 × 15 km 2 ) magnetotelluric data sets and obtained the first multi-scale 3-D electrical conductivity model of a segment of the central Main Ethiopian Rift. The model unravels a magma ponding zone with up to 7 vol. % melt at the base of the crust (30-35 km b.s.l.) in the western part of the rift and its connection to Aluto volcano via a fault-aligned transcrustal magma system. Melt accumulates at shallow crustal depths (≥4 km b.s.l.), thereby providing heat for Aluto's geothermal system. Our model suggests that different volcano-tectonic lineaments in the rift valley share a common melt source. The presented model provides new constraints on the melt distribution below a segment of the rift which is important for future geothermal developments and volcanic hazard assessments in the region.Plain Language Summary Continental rifting is a fundamental process of plate tectonics that breaks continents apart to ultimately form new oceans. The landscape of the Main Ethiopian Rift is characterized by abundant volcanism and hot springs, which indicate the presence of geothermal resources formed by magmatic heating of subsurface fluids. Here we present a new 3-D subsurface electrical conductivity image of the magmatic system and geothermal reservoir beneath the Aluto volcano in the Main Ethiopian Rift. The model allows us to estimate the amount and distribution of magmatic melt. This is the first model that provides a high-resolution image of the entire magmatic system below a centr...

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Section: Discussionmentioning

confidence: 99%

Insights on the Interplay of Rifting, Transcrustal Magmatism and Formation of Geothermal Resources in the Central Segment of the Ethiopian Rift Revealed by 3‐D Magnetotelluric Imaging

et al. 2023

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“…I‐type granites are generally originate from partial melting of ancient or juvenile mafic lower crust (Chappell & White, 2001; C. Li et al, 2007; S. Z. Li et al, 2022; Y. Zhu et al, 2019a). The Nb/Ta ratios of the Shuanghu granodiorites span a range of 8.61 to 12.1, with an average of 10.…”

Section: Discussionmentioning

confidence: 99%

“…Zhu et al, 2019b). I-type granites are generally originate from partial melting of ancient or juvenile mafic lower crust (Chappell & White, 2001;S. Z. Li et al, 2022;Y.…”

Section: Origin Of the Granodioritesmentioning

confidence: 99%

Petrogenesis and geodynamic significance of Late Triassic mafic microgranular enclaves and its host granodiorite in the Shuanghu area, central Qiangtang

Xie

Huang

et al. 2022

Geological Journal

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The genesis of Late Triassic granitoids in the central Qiangtang is significant for deducing the evolution of the Palaeo‐Tethys Ocean in Qiangtang Block. Herein, we present a comprehensive study of zircon U–Pb ages, whole‐rock geochemistry and zircon Lu–Hf isotopes for the mafic microgranular enclaves (MMEs) and host granodiorites from the Shuanghu area, in order to evaluate their petrogenesis and geodynamic implications. New zircon U–Pb dating show identical formation ages for host granodiorites (207.1 ± 2.2 Ma and 206.6 ± 3.8 Ma) and MMEs (205.4 ± 2.9 Ma and 209.2 ± 2.2 Ma). The Shuanghu granodiorites contain amphibole and biotite and are characterized by moderate SiO2 (64.74–66.40 wt%) and K2O contents (2.48–3.62 wt%) as well as low A/CNK (0.69–1.00), indicating I‐type granite affinity. Its enriched zircon Hf isotopes (εHf(t) = −12.04 to −5.09) indicate that they were derived from the ancient mafic lower crust. The MMEs have a similar mineral assemblage, emplacement ages, trace elemental and zircon Hf isotopic compositions with the host granodiorites, indicating the cognate origin. These MMEs represent autoliths captured by latter ascending host magmas in the middle‐upper magma chamber. The highly variable Mg# (37–53), Cr (16.9–190 ppm) and Ni (5.71–67.2 ppm) in the Shuanghu MMEs and host granodiorites indicate that the mantle‐derived magma provided not only the heat but also the mafic components. In combining with previous studies, we suggest that the Shuanghu granodiorites and MMEs were formed in the post‐collision stage, which were caused by the asthenosphere upwelling related to the slab breakoff.

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“…It is widely accepted that the Jurassic–Cretaceous tectonics in eastern China were controlled by the subduction of the Palaeo–Pacific Plate (Xu, Zhu, Tong, Cui, & Liu, 1987; Zhao, Cui, Guo, & Xu, 2002; Li & Li, 2007; Dong et al, 2008, 2015, 2019; Zhu, Jiang, Zhang, & Chen, 2012, Zhu et al, 2012, Zhu et al, 2017; Li et al, 2017, 2018, 2019, Li et al, 2021; Zhu & Yigang, 2019; Yin, Zhu, Wu, Su, & Zhang, 2020; Yuan et al, 2020; Figure 1a). Regional extension and compression events have been widely reported in both the North China Craton (NCC) (Dong et al, 2015; Gu et al, 2017; Liu et al, 2018; Wang et al, 2011; Zhang et al, 2019; Zhu et al, 2018) and South China Block (SCB) (Chu et al, 2019; Chu, Lin, Faure, Allen, & Feng, 2020; Li et al, 2013; Li et al, 2020; Li et al, 2020; Li, Zhang, Dong, & Johnston, 2014; Shu et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…The regional comparison indicated that the Early Cretaceous tectonic evolution of the TLFZ was actually the epitome of the contemporaneous tectonic evolution of eastern China and was the result of strain localization in the Cretaceous tectonic framework of eastern China. (Xu, Zhu, Tong, Cui, & Liu, 1987;Zhao, Cui, Guo, & Xu, 2002;Li & Li, 2007;Dong et al, 2008Dong et al, , 2015Dong et al, , 2019Zhu, Jiang, Zhang, & Chen, 2012Li et al, 2017, Li et al, 2021Zhu & Yigang, 2019;Figure 1a). Regional extension and compression events have been widely reported in both the North China Craton (NCC) (Dong et al, 2015;Gu et al, 2017;Liu et al, 2018;Wang et al, 2011;Zhang et al, 2019;Zhu et al, 2018) and South China Block (SCB) (Chu et al, 2019;Chu, Lin, Faure, Allen, & Feng, 2020;Li et al, 2013;Li, Zhang, Dong, & Johnston, 2014;Shu et al, 2009).…”

mentioning

confidence: 98%

Deformation history of the Feidong Segment of the Tan–Lu Fault zone in the Early Cretaceous: Implications for the tectonic evolution in eastern China

Chen

Yuan

et al. 2022

Geological Journal

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The Tan–Lu Fault zone (TLFZ) is the largest fault zone in eastern China and a typical and representative structure of the Circum–Pacific tectonic domain. The Late Mesozoic tectonic evolution of the TLFZ is greatly significant, since it revealed the Jurassic–Cretaceous tectonic evolution of eastern China and the subduction history of the Palaeo–Pacific Plate. However, its tectonic evolution in the Early Cretaceous remains controversial. Based on geological mapping, microstructural analysis, and LA–ICP–MS zircon U–Pb dating, we constrained the deformation history of the Feidong Segment of the TLFZ in the Early Cretaceous. Results showed that the Feidong Segment of the TLFZ experienced a strong sinistral strike–slip movement at the beginning of the Early Cretaceous (~143 Ma); it was subsequently subjected to normal faulting during the Early Cretaceous (135–102 Ma), which controlled the strong magmatic activities within the Feidong area. At the end of the Early Cretaceous (~100 Ma), a weak sinistral strike–slip movement occurred again along the TLFZ. The deformation temperatures of the two sinistral strike–slip shearing stages were 500–550°C and 400–450°C, respectively. The regional comparison indicated that the Early Cretaceous tectonic evolution of the TLFZ was actually the epitome of the contemporaneous tectonic evolution of eastern China and was the result of strain localization in the Cretaceous tectonic framework of eastern China.

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Passive magmatism on Earth and Earth-like planets

Cited by 33 publications

References 188 publications

Insights on the Interplay of Rifting, Transcrustal Magmatism and Formation of Geothermal Resources in the Central Segment of the Ethiopian Rift Revealed by 3‐D Magnetotelluric Imaging

Insights on the Interplay of Rifting, Transcrustal Magmatism and Formation of Geothermal Resources in the Central Segment of the Ethiopian Rift Revealed by 3‐D Magnetotelluric Imaging

Petrogenesis and geodynamic significance of Late Triassic mafic microgranular enclaves and its host granodiorite in the Shuanghu area, central Qiangtang

Deformation history of the Feidong Segment of the Tan–Lu Fault zone in the Early Cretaceous: Implications for the tectonic evolution in eastern China

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