Article
Geology
Birger Rasmussen, Jian-Wei Zi, Janet R. Muhling
Summary: The study on in situ Th-Pb geochronology of phosphate minerals reveals different stages of fluid flow activities during the Paleoproterozoic and Phanerozoic in the Archean craton, showing the association of major continental breakup events in the Mesozoic with phosphate growth periods. Investigating carbonaceous shale from the 2.76 Ga Mount Roe Basalt in the Pilbara Craton, rhabdophane is proposed as a potential indicator for U-Th-Pb geochronology, allowing dating of low-temperature fluid flow and hydrous alteration events.
Article
Geosciences, Multidisciplinary
Praveen C. Singh, Suranjan Ghosh, N. Prabhakar, H. Hrushikesh
Summary: The Bhopalpatnam Granulite Belt in India is composed of granite gneisses and high-grade rocks. Petrographic, metamorphic, and geochronological investigations provide insights into the metamorphism and tectonic history of the belt. The formation of the granulite belt is associated with continental collision and rift basin development.
PRECAMBRIAN RESEARCH
(2022)
Article
Geology
Steven K. Spreitzer, Jesse B. Walters, Alicia Cruz-Uribe, Michael L. Williams, Martin G. Yates, Michael J. Jercinovic, Edward S. Grew, Christopher J. Carson
Summary: This study presents the rock exposures along the Prydz Bay coast, including the Larsemann Hills, and proposes a scenario for Cambrian metamorphism based on electron microprobe dates and pseudosection models. The results reveal a polymetamorphic history and tectonic events at approximately 900 Ma and 530 Ma, with specific monazite growth domains linked to individual tectonic stages. The study also discusses the duration of granulite-facies metamorphism and cooling history in the Larsemann Hills, which is consistent with estimates for similar complexes elsewhere.
JOURNAL OF METAMORPHIC GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Paula E. Salminen, Raimo Lahtinen, Mohammad Sayab
Summary: This study investigates the age characteristics of high-temperature, low-pressure metamorphism in the Svecofennian orogeny in Fennoscandia by analyzing zircon age data from 15 paragneiss samples and two granitoid samples. The results show variations in zircon age distributions among different regions, with younger dates more common in pelitic layers. Zircon grains before 1.91 Ga may have dual origins from detrital and metamorphic sources.
Article
Geosciences, Multidisciplinary
Dingding Zhang, Patrick J. O'Brien, Hans-Peter Schertl, Xudong Ma, Zhonghua Tian, Lei Zhao, Jinghui Guo
Summary: The discovery of three half-meter-wide pelitic granulite interlayers in the Chicheng area of the North China Craton helps to understand the assembly of the Eastern and Western blocks. Detailed petrological study reveals identical high-pressure mineral assemblages, including garnet, kyanite, K-feldspar, plagioclase, quartz, and rutile. Phase equilibria modeling indicates peak metamorphic pressure and temperature conditions, with differences observed between pelitic and mafic granulites.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Sotaro Baba, Kenji Horie, Tomokazu Hokada, Mami Takehara, Atsushi Kamei, Ippei Kitano, Yoichi Motoyoshi, Prayath Nantasin, Nugroho I. Setiawan, Davaa-ochir Dashbaatar
Summary: This study reports a new metamorphic age for a kyanite-bearing garnet-biotite gneiss from Akebono Rock in the Lutzow-Holm Complex (LHC) in East Antarctica. The research shows that the gneiss underwent a clockwise amphibolite-facies metamorphic history. U-Pb zircon dating reveals two different age populations, with the younger population indicating a weighted mean age of 937 +/- 6 Ma. Ti-in-zircon thermometry supports the crystallization of zircon domains at a temperature close to the metamorphic peak. Monazite EMP dating provides additional evidence for the Tonian metamorphism of the Akebono Rock gneiss. These findings suggest the need for a fundamental revision of the sequence of metamorphic events in the Prince Olav Coast area of the LHC.
Article
Geology
Shi Zong, Liudong Ren, Meiqian Wu, Hui Xu, Shifei Zhu
Summary: Understanding the geological history of the Larsemann Hills and other exposures in Prydz Bay is crucial for reconstructing the formation and evolution of the East Gondwana continent. Based on the analysis of zircons, the metasedimentary rocks in the Larsemann Hills are mainly derived from Mesoproterozoic to early Neoproterozoic magmatic rocks, and have undergone at least two tectono-metamorphic events. Furthermore, Prydz Bay has existed as a whole entity before the Paleozoic era and was later reactivated by Pan-African tectonic events.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Badanal Siddaiah Mahesh, Anish Kumar Warrier, Abhilash Nair, Revellino Fernandes, Rahul Mohan
Summary: The lakes of the coastal oasis in Larsemann Hills respond to changes in regional climate, influenced by ice-sheet dynamics, and eustatic variation. Sedimentary sequences from ice-free regions in Antarctica provide unique climate records. A lake's evolution reconstructed from sedimentary sequences shows that it transitioned from a proglacial lake dammed by ice-sheet to an isolated lake as the ice retreated, affecting lake level and sedimentary processes.
Article
Geochemistry & Geophysics
Wei-(RZ) Wang, Yue Zhao, Chunjing Wei, Nathan R. Daczko, Xiaochun Liu, Wenjiao Xiao, Zhiyong Zhang
Summary: The granulites in the Larsemann Hills have undergone complex metamorphic evolution and exhibit high-temperature conditions, suggesting a widespread distribution of high heat flow and potential UHT metamorphism in the Prydz Bay region. This study provides important insights into the tectonic and metamorphic evolution of East Antarctica.
JOURNAL OF PETROLOGY
(2022)
Article
Geosciences, Multidisciplinary
Pavla Stipska, Vit Peresty, Igor Soejono, Karel Schulmann, R. C. Andrew Kylander-Clark, Carmen Aguilar, Stephen Collett, Martin Racek, Jitka Mikova, Otgonbaatar Dorjsuren, Nikol Novotna
Summary: This study investigates the accretionary orogenic processes occurring at the periphery of the Rodinia supercontinent after its assembly. Metamorphic rocks in the Mongolia collage of the Central Asian Orogenic Belt are studied to fill the knowledge gap. It is found that the tectono-metamorphic evolution was mainly characterized by the late Proterozoic-early Cambrian cycle, but a Tonian age metamorphism is documented in the northern part of the Precambrian Baidrag block.
GEOSCIENCE FRONTIERS
(2023)
Article
Geosciences, Multidisciplinary
Yuanyuan Zhang, Chunjing Wei, Hang Chu
Summary: By studying garnet mica schists in the Hongqiyingzi Complex on the northern margin of the North China Craton, researchers have identified four phases of metamorphism, connecting with regional geological events including Paleoproterozoic orogenic belt tectonic changes, Late Paleozoic extension, and Early Mesozoic collision. The study provides insights into the complex tectonic evolution of the North China Craton and surrounding regions.
Article
Geosciences, Multidisciplinary
Monica G. Lopez de Luchi, Carmen I. Martinez Dopico, Kathryn A. Cutts, Bernhard Schulz, Siegfried Siegesmund, Klaus Wemmer, Teresita Montenegro
Summary: The Conlara Metamorphic Complex in the Sierra de San Luis is a key unit for studying the relationship between different orogenies in the region. It consists of metaclastic and metaigneous rocks intruded by granitoids, and is divided into four groups based on lithological associations. The complex underwent a polyphase metamorphic evolution with different deformation phases impacting the rocks.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Sergio P. Neves, Cristiane M. L. Teixeira, Valdielly L. Silva, Olivier Bruguier
Summary: This study presents the thermal evolution of the Surubim Complex in Northeast Brazil, showing that temperatures remained relatively elevated for over 60 million years, leading to local anatexis during the development of regional low-angle foliation.
PRECAMBRIAN RESEARCH
(2022)
Article
Geography, Physical
M. R. Kaplan, K. J. Licht, J. L. Lamp, G. Winckler, J. M. Schaefer, J. A. Graly, C. M. Kassab, R. Schwartz
Summary: This study presents 100 cosmogenic surface exposure ages, including 75 new analyses, for a blue-ice moraine complex at Mt. Achernar in the central Transantarctic Mountains. The ages reveal the past behavior of the East Antarctic Ice Sheet along the edge of the polar plateau since sediment accumulation began around 0.5-1 Ma. The findings suggest relatively minor fluctuations in surface elevation and disturbances to the blue-ice moraine architecture over time. This research highlights the importance of blue-ice sediments as a paleoglaciologic and paleoclimate archive in Antarctica. Rating: 8/10.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Bing Yu, M. Santosh, Ming-Xian Wang, Cheng-Xue Yang
Summary: The study reports the discovery of a dismembered layered mafic-ultramafic intrusion associated with Mg-Al granulites in the Madurai Block of the Southern Granulite Terrane. The rock types and mineral compositions were analyzed to determine the metamorphic conditions and geological ages, and the intrusion was correlated to a Paleoproterozoic suprasubduction zone setting.
GEOSCIENCE FRONTIERS
(2022)
