Tectonic evolution of Southwest Japan at the Cretaceous time inferred from the zircon U–Pb geochronology along the Maana Belt, western Shikoku, Japan

Kawaguchi, Kenta; Hayasaka, Yasutaka; Shibata, Tomoyuki; Kimura, Kosuke; Das, Kaushik

doi:10.1016/j.lithos.2021.106568

Cited by 1 publication

(2 citation statements)

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“…During this analytical session, the weighted average 206 Pb/ 238 U ages of zircon standards YO1 was 274.8 ± 7.2 Ma ( n = 8, MSWD = 2.1), which is consistent with their TIMS ages. The detailed methodology including the flow parameters and data procurement is as mentioned in Kawaguchi et al (2022).…”

Section: Methodsmentioning

confidence: 99%

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U–Pb geochronology and metamorphic history of gneissic rocks from Sarwar‐Junia Fault Zone, Rajasthan, NW India: Implications for the tectonothermal evolution of the Aravalli‐Delhi Mobile Belt

Okazaki,

Das,

Chattopadhyay

et al. 2023

Geological Journal

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The gneisses of the Sarwar‐Junia Fault Zone (SJFZ), in the Mangalwar Gneissic Complex, a part of the Banded Gneissic Complex (BGC‐II) of northwest India recorded two phases of metamorphism. The pelitic gneiss from SJFZ mainly consists of biotite, sillimanite, garnet, quartz, K‐feldspar and plagioclase. On the other hand, the granitic gneiss from SJFZ mainly consists of quartz, plagioclase, K‐feldspar and biotite. From zircon and monazite geochronology, the protolith of pelitic gneiss was deposited on basement granitic gneiss and the metamorphism occurred at ca. 950 Ma affecting both the granitic gneiss and the pelitic gneiss. Estimation of the P‐T conditions of metamorphism and pseudosection modelling of the pelitic gneiss revealed that the peak stage metamorphic condition of M2 culminated at ~850°C and ~7 kbar pressure followed by a near‐isobaric cooling. Large garnet porphyroblasts in contact with retrograde biotite shows Fe‐Mg resetting close to the core region, which implies a slow cooling. Therefore, the possible exhumation during the subduction‐collision tectonics was very slow, if not completely ceased, at ca. 950 Ma. The shared tectonothermal history of the Sandmata Metamorphic Complex and Mangalwar Metamorphic Complex in the BGC‐II is now evident from the present study of the SJFZ, and confirms the presence of Grenvillian‐aged tectonothermal events in the eastern part of BGC‐II. The abovementioned near‐isobarically cooled and hydrated crust of the SJFZ records subsequent event(s) of shallow crustal brittle faulting as evident by the presence of pseudotachylyte veins and cataclastic fabric observed in the studied gneisses. Brittle faulting possibly occurred between ca. 905 Ma and ca. 750 Ma, as interpreted from the present geochronological data.

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Section: Methodsmentioning

confidence: 99%

“…X-rays generated by a 4 kW W-anode tube were radiated on fused bead samples. The detailed methodology is mentioned in Kawaguchi et al (2022).…”

Section: Mineral and Bulk Rock Chemistrymentioning

confidence: 99%

U–Pb geochronology and metamorphic history of gneissic rocks from Sarwar‐Junia Fault Zone, Rajasthan, NW India: Implications for the tectonothermal evolution of the Aravalli‐Delhi Mobile Belt

Okazaki,

Das,

Chattopadhyay

et al. 2023

Geological Journal

Self Cite

View full text Add to dashboard Cite

show abstract

Tectonic evolution of Southwest Japan at the Cretaceous time inferred from the zircon U–Pb geochronology along the Maana Belt, western Shikoku, Japan

Cited by 1 publication

References 59 publications

U–Pb geochronology and metamorphic history of gneissic rocks from Sarwar‐Junia Fault Zone, Rajasthan, NW India: Implications for the tectonothermal evolution of the Aravalli‐Delhi Mobile Belt

U–Pb geochronology and metamorphic history of gneissic rocks from Sarwar‐Junia Fault Zone, Rajasthan, NW India: Implications for the tectonothermal evolution of the Aravalli‐Delhi Mobile Belt

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