Article
Geosciences, Multidisciplinary
Ingrid M. Nedel, Reinhardt A. Fuck, Amarildo S. Ruiz, Gerardo R. Matos-Salinas, Alanielson da C. D. Ferreira
Summary: The Sunsas belt in Bolivia has experienced four major magmatic events at different geological periods, including the formation of granitic basement in coeval terranes, a magmatic association with various terranes, and multiple magmatic events related to orogenies. The ages obtained from monazite and zircon data suggest a complex geological evolution with evidence of multiple reworking events in the Sunsas belt.
GEOSCIENCE FRONTIERS
(2021)
Article
Geosciences, Multidisciplinary
Aurovinda Panda, Ravi Shankar, D. Srinivasa Sarma, Rahul Patel
Summary: This research examines the geochronology and geochemistry of Paleoproterozoic mafic dykes in the Bastar craton in India. The ages of the dykes range from 2365.25 Ma to 1886.5 Ma. The composition of the dykes falls within the basalt to basaltic andesite range. The source of the dykes varies depending on their age, with the older dykes derived from a deeper spinel-garnet lherzolitic mantle source.
PRECAMBRIAN RESEARCH
(2023)
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
K. Sundaralingam, Sam Uthup, Toshiaki Tsunogae, M. L. Renjith, Munesh K. Sahu
Summary: This study reveals evidence of Neoarchean ultrahigh-temperature metamorphism in the Karimnagar Granulite Terrane in southern India, with peak metamorphic conditions estimated at 905-910 degrees C and 4.5-4.6 kbar. The findings overturn the existing tectonic model of the region and suggest a complex history of UHT metamorphism and near-isobaric cooling taking place during the amalgamation of microcontinents and magmatic arcs around 2.7-2.62 Ga.
Article
Geochemistry & Geophysics
Priyanjan Datta, Sisir K. Mondal
Summary: The chromite and magnesite deposits in Talur, Sindhuvalli, and Doddakanya are part of the Archean Sargur greenstone belt in the Indian shield. Detailed studies show compositional variability of chromite grains in different types of chromitites in the ultramafic sequence, with differences in Mg# and accessory mineral inclusions. These variations could be attributed to different petrogenetic processes in each locality.
Article
Geology
Kiranmala Patra, Anshuman Giri, R. Anand, S. Balakrishnan, Jitendra K. Dash
Summary: The timing of formation of the Sargur Group rocks is crucial in understanding crustal evolution processes, but their specific age has always been difficult to constrain. New Sm-Nd isotope data provide a relatively precise age, suggesting that these rocks may represent older ultramafic equivalents of the Dharwar Supergroup.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geosciences, Multidisciplinary
Tushar Meshram, M. Lachhana Dora, Srinivasa R. Baswani, Dewashish Upadhyay, Rajkumar Meshram, Kirtikumar Randive, Sameer Ranjan, Jayanta K. Nanda
Summary: Charnockites found in the granulite belts of the Godavari rift in India show similarities in geological features and mineral composition, indicating their coeval formation around 2.5 billion years ago as part of a potential Ur-supercontinent. The subsequent splitting of this landmass along the Pranhita-Godavari rift formed the Bastar and Dharwar cratons, with the rift valley eventually developing into a sedimentary basin that separated the two cratons on the map.
Article
Geochemistry & Geophysics
Sampriti Basak, Eric Hasenstab, Santanu Kumar Bhowmik, Axel Gerdes, Somnath Dasgupta, Carsten Muenker, Gr. Ravindra Kumar, Sumit Chakraborty
Summary: Studying high-grade metamorphic rocks in a crustal-scale shear zone can provide insights into the Archean tectonic processes. Petrological investigations reveal different compositions and reaction histories of these rocks. By using thermobarometry, phase equilibria modeling, and geochronology, a multi-stage P-T-t history was reconstructed, suggesting an early form of peel-back styled orogenesis and intracrustal differentiation.
JOURNAL OF PETROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Venkateshwarlu Mamilla, Ramesh Babu Nathi
Summary: A study using Paleomagnetism and rock magnetism as a proxy on dykes in India reveals two types of thermo-magnetic curves for Belagumba and Navile dykes, with magnetite as a remanence carrier. The magnetic directions of the dykes show two components and the corresponding paleopoles suggest a rapid drift rate and clockwise rotation during a specific time period.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Tarun C. Khanna, S. H. Jaffri
Summary: This study presents evidence of rare paleotectonic intracratonic event from the western Dharwar craton in India, showcasing a comagmatic suite of High-Mg tholeiitic dikes with distinct geochemical and isotopic signatures. The dikes exhibit characteristics that suggest they were not contaminated by crustal materials, indicating a unique paleotectonic setting. Geochemical and isotopic analysis of these dikes imply a potentially eroded lithosphere beneath the Dharwar craton around 2.5 billion years ago, suggesting a complex geological history in the region.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
K. S. Anoop, Y. Anilkumar, M. Santosh, Bing Yu, K. Delna Joy, K. Kavyanjali, Ajana Sathyan, Anjana Mathew, K. S. Sajinkumar
Summary: This study reports the presence of a layered intrusion at the northern margin of the Coorg Block and investigates its magmatic and metamorphic evolution, as well as the collisional event between the Coorg Block and the Dharwar Craton.
Article
Multidisciplinary Sciences
Chethan Kumar, Yogmaya Shukla, Mukund Sharma, S. B. Harish Kumar, N. Malarkodi, Saleem Ahmed Khan
Summary: A new discovery of ancient stromatolites in the Dharwar Craton provides important evidence of the advanced stage of evolution of these structures over 2.6 billion years ago.
Article
Geosciences, Multidisciplinary
G. Harshitha, C. Manikyamba, M. Santosh, Cheng-Xue Yang, A. Keshav Krishna, V. V. Sesha Sai, I. Panduranga Reddy
Summary: The early Archean oceans underwent significant redox changes that had a lasting impact on the Earth's biosphere. This study investigates the geochemical characteristics of Archean Mnformations in southern India and reveals the importance of these sedimentary deposits in understanding the ancient redox conditions and sedimentation patterns. The findings suggest that the sediments were deposited in shallow to deeper shelf environments in the Archean proto-ocean, and they provide evidence of regional episodes of ocean oxygenation prior to the Great Oxygenation Event.
GEOSCIENCE FRONTIERS
(2024)
Article
Geosciences, Multidisciplinary
P. G. Athira, K. Sajeev, P. M. George, M. G. Zhai, L. G. Zhou, T. Razakamanana, B. F. Windley, V. A. Ayisha
Summary: The beach sands in Southeast Madagascar contain zircons and monazites that mainly originated from granitic rocks in southern Madagascar and metasedimentary rocks in central Madagascar. These heavy minerals were transported by rivers to the ocean in the southeast region.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geochemistry & Geophysics
Yunpeng Sun, Qing Ouyang, Xianguo Lang, Ke Pang, Chengxi Wu, Zhe Chen, Chuanming Zhou
Summary: The Great Unconformity that separates the Cambrian and the underlying Proterozoic strata is believed to be a composite of multiple diachronous unconformities. The absence of certain age zircons suggests a significant tectonic quiescence, and the worldwide Ediacaran-Cambrian unconformity may be caused by a global sea-level fall associated with the assembly of the Gondwana supercontinent.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geology
N. Chatterjee
JOURNAL OF METAMORPHIC GEOLOGY
(2017)
Article
Geosciences, Multidisciplinary
Yener Eyuboglu, Francis O. Dudas, M. Santosh, Tugba Eroglu-Gumruk, Kubra Akbulut, Keewook Yi, Nilanjan Chatterjee
JOURNAL OF ASIAN EARTH SCIENCES
(2018)
Article
Geochemistry & Geophysics
Yener Eyuboglu, Francis O. Dudas, Nilanjan Chatterjee, Ze Liu, Sedanur Yilmaz-Degerli
Article
Geosciences, Multidisciplinary
Nilanjan Chatterjee
PRECAMBRIAN RESEARCH
(2018)
Article
Geochemistry & Geophysics
Yener Eyuboglu, Francis O. Dudas, Nilanjan Chatterjee, M. Santosh, Mehmet Z. Billor, Sabire Yuva
Article
Geochemistry & Geophysics
Yener Eyuboglu, Francis O. Dudas, Di-Cheng Zhu, Ze Liu, Nilanjan Chatterjee
Article
Geochemistry & Geophysics
A. Bhattacharya, S. Rekha, Nicole Sequeira, Aditi Chatterjee
Article
Geochemistry & Geophysics
Nilanjan Chatterjee
Summary: SiO2-undersaturated alkalic rocks in the Deccan Traps province of India are mostly associated with rift activity and crystallized beneath the Moho at pressures and temperatures indicating an origin from Ti-enriched lherzolitic sources. The primary magmas of these rocks are likely not derived from hornblendite, pyroxenite, or carbonated eclogite sources. The alkalic rocks probably formed by <5% melting of Ti-enriched lherzolitic sources relative to primitive mantle, with further evolution through assimilation-fractional crystallization processes.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Geosciences, Multidisciplinary
P. Praharaj, S. Rekha, A. Bhattacharya
Summary: This study provides a detailed analysis of contrasting mesoscale structures and deformation kinematics in granulite facies rocks across the Achankovil Shear Zone (AKSZ) in South India. The structural-chronological contrasts between the Trivandrum Block and the Madurai Block suggest the AKSZ to be a Pan-African terrain boundary shear zone system that is continuous with the Ranotsara shear zone in Madagascar.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2021)
Review
Geosciences, Multidisciplinary
Yener Eyuboglu, Francis O. Dudas, Di-Cheng Zhu, M. Santosh, Ze Liu, Nilanjan Chatterjee, Keewook Yi
Summary: The research on the Eastern Pontides Orogenic Belt in northeastern Turkey reveals a complex continental arc system with multi-stage Late Cretaceous magmatism showing different characteristics in terms of rock types and geochemical features, indicating a significant geological differentiation.
Article
Geochemistry & Geophysics
Yener Eyuboglu, Francis O. Dudas, Di-Cheng Zhu, Ze Liu, Nilanjan Chatterjee, Kubra Akbulut, Liang-Liang Zhang, Shi-Min Li
Summary: The study focuses on hypabyssal intrusives and xenoliths in the Late Cretaceous to Early Paleocene period in northeastern Turkey, detailing their major and trace element compositions, zircon U-Pb ages, and mineral compositions. The host rocks and xenoliths show similarities and differences in terms of their geochemical signatures, which provide insights into the magmatic processes in the study area.
Article
Multidisciplinary Sciences
Caue S. Borlina, Benjamin P. Weiss, James F. J. Bryson, Xue-Ning Bai, Eduardo A. Lima, Nilanjan Chatterjee, Elias N. Mansbach
Summary: Astronomical observations and isotopic measurements of meteorites suggest that substructures are common in protoplanetary disks and may also have existed in the solar nebula. Paleomagnetic measurements of chondrules in CO carbonaceous chondrites indicate the presence of a higher intensity magnetic field in the outer solar system, compared to the inner solar system, suggesting significant mass loss from the disk associated with a major disk substructure.
Article
Geochemistry & Geophysics
Nilanjan Chatterjee
Summary: Reverse fractionation modeling is used to estimate the primary magma compositions, degree of crustal contamination, pressure-temperature equilibrium with mantle, and potential temperatures for the basaltic dikes and sills/volcanics in southern India. The results suggest that the basalts are contaminated and have enriched light rare earth element patterns due to upper crustal assimilation. The estimated mantle potential temperatures are similar to Paleoproterozoic ambient mantle temperatures. The low Dy-N/Yb-N ratios and a spinel-bearing mantle source contradict an origin of the basalts from mantle plumes.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Biology
Juliet Y. F. Ramey-Lariviere, Jian Gong, Matthew J. Baldes, Nilanjan Chatterjee, Tanja Bosak, Sara B. Pruss
Summary: Evidence shows that microbial activities contribute to the formation of carbonate minerals in ooids found at Carbla Beach in Shark Bay, Western Australia.
Article
Geochemistry & Geophysics
Nilanjan Chatterjee, Naresh C. Ghose
Summary: The Late Aptian Rajmahal Traps were formed by volcanic activity related to the Kerguelen Plume at the eastern margin of the Indian Shield. The magmas crystallized at upper crustal depths and were in equilibrium with the mantle at deeper depths. It is likely that the mantle-derived magmas accumulated below the upwarped Moho and were transported to the upper crust before eruption.
