Article
Geosciences, Multidisciplinary
Weibing Shen, Xiangkun Zhu, Bin Yan, Haoyi Qin, Zhaofu Gao, Fangbing Li
Summary: The sedimentary studies from the Marinoan deposits in South China provide a basis for establishing a sequence stratigraphic framework that includes two complete glacial cycles. These cycles demonstrate a pattern of ice-advance and ice-retreat successions, with corresponding changes in sedimentary facies and lithofacies association. The dynamic co-evolution of sedimentary environments, paleoclimate, and sea level during the Marinoan glaciation is indicated by this sequence stratigraphic framework.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Liang Qi, Mingcai Hou, Peter A. Cawood, Xianguo Lang, Shengxian Zhu, Mingxuan Zhang
Summary: The Neoproterozoic snowball Earth hypothesis was proposed to explain a significant global climate change. However, the presence of storm deposits in the Huangdongzigou Formation of South China contradicts the idea of a complete frozen Earth during the Cryogenian period. The age of these deposits, based on U-Pb zircon data, indicates that they were formed during the middle Sturtian interval. Sedimentary structures, such as hummocky and swaley cross-stratification, suggest the presence of oscillating ice-free water flow during storm events.
PRECAMBRIAN RESEARCH
(2023)
Article
Environmental Sciences
Seungmok Paik, Daehyun Kim, Soon-Il An, Yoo-Geun Ham
Summary: This study evaluates the projections of September sea ice area (SIA) in the Arctic using CMIP6 model simulations and taking into account Arctic sub-regions. Findings show that the models overestimate the historical SIA decreasing trend in the central Arctic but underestimate it in the surrounding shelf seas. The central Arctic, which is expected to retain sea ice for the longest period, is of particular significance in predicting the first ice-free September. Observationally-constrained projections suggest a delay of 12 years compared to raw/unconstrained projections, highlighting the importance of considering model biases in central Arctic SIA.
Article
Geosciences, Multidisciplinary
Jinlun Zhang
Summary: The model study indicates that the slowdown in the decline of Arctic sea ice volume during 2007-2020 is a result of decreased ice export exceeding the decrease in net ice production. Thinner ice grows faster than thicker ice under freezing conditions, and benefits from enhanced ice divergence and shear.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Xiao Zhou, Bin Wang, Fei Huang
Summary: The rapid decline of Arctic sea ice is a clear indication of global climate change. Existing evaluation metrics are insufficient, leading to the proposal of two new metrics based on sea ice thickness. Good models project the first ice-free year in the Arctic to be 2049.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
N. J. Teder, L. G. Bennetts, P. A. Reid, R. A. Massom
Summary: Sea ice can attenuate the impact of swell on Antarctic ice shelves, but certain ice shelves may still experience flexural stresses caused by large swell, exacerbating climate-driven weakening and decreased buttressing capacity, thus influencing sea-level rise.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Geography, Physical
Zhaozhao Tan, Wanglu Jia, Jie Li, Lu Yin, Susu Wang, Jinxiang Wu, Jianzhong Song, Ping'an Peng
Summary: The study focuses on the geochemical characteristics and depositional environment of Mn deposits in the basal Datangpo Formation in South China, indicating that the enrichment of organic matter in Mn carbonates may be due to re-mineralization within sediments.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Xi Zhang, Yixun Zhu, Jie Zhang, Qimao Wang, Lijian Shi, Junmin Meng, Chenqing Fan, Meijie Liu, Genwang Liu, Meng Bao
Summary: This study investigates the differences in waveform features of C- and Ku-band radar altimeter over different types of sea ice using the Chinese HY-2B satellite. The research proposes a methodology for sea ice classification that combines data from C- and Ku-band altimeter waveforms, showing significantly higher accuracy (up to 93.45%) compared to existing methods.
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2021)
Article
Geology
Liping Liu, Fengyou Chu
Summary: Sedimentary manganese deposits with considerable resource exploration potential have been newly discovered in the southeastern Yangtze Platform of China. The origin of these deposits was investigated by analyzing major and trace elements, total organic carbon, and stable isotopes. The Mn deposits were derived from a hydrothermal system, while the host rock was deposited under dysoxic - anoxic and even sulfidic water conditions. The diagenetic degradation of organic matter through Mn oxide reduction contributed to a considerable source of bicarbonates, and the post-depositional genesis of the Mn carbonate ore occurred in a relatively open early diagenetic pore water system with a significant contribution from seawater-derived carbon sources.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Environmental Sciences
Shi-Yi Chen, Stefan Kern, Xin-Qing LI, Feng-Ming Hui, Yu-Fang Ye, Xiao Cheng
Summary: This study analyzes the impact of sea ice conditions on navigation in the Arctic, specifically focusing on the navigability of Arc7 ice-class vessels along the Northern Sea Route (NSR) during winter and spring. The results reveal lower sea ice thickness and similar ice concentration during successful transit in 2021 compared to the past 42 years. Future projections suggest a further decrease in sea ice thickness, enabling increased navigability for Arc7 ice-class vessels in the NSR.
ADVANCES IN CLIMATE CHANGE RESEARCH
(2022)
Article
Environmental Sciences
Shi-Yi Chen, Stefan Kern, Xin-Qing LI, Feng-Ming Hui, Yu-Fang Ye, Xiao Cheng
Summary: Sea ice hinders Arctic navigability, yet three Arc7 ice-class LNG vessels successfully transited the NSR in January 2021 without icebreaker assistance. Analysis of sea ice conditions and impact suggests future projections show decreasing sea ice thickness in most NSR regions from January to June, enabling increased navigability for Arc7 ice-class vessels by 2050.
ADVANCES IN CLIMATE CHANGE RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Dominic A. Winski, Erich C. Osterberg, Karl J. Kreutz, David G. Ferris, Jihong Cole-Dai, Zayta Thundercloud, Jiayue Huang, Becky Alexander, Lyatt Jaegle, Joshua A. Kennedy, Carleigh Larrick, Emma C. Kahle, Eric J. Steig, Tyler R. Jones
Summary: This study uses data from the South Pole Ice Core and a chemical transport model to show the seasonal variability in the sources of sea salt in the Southern Hemisphere, with winter variations playing a key role in centennial to millennial scale structures in the record, and explains the potential reasons for the increased Holocene sea salt concentrations.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
Marko Makynen, Markku Simila
Summary: ATIDA2 is a thin ice detection algorithm developed for AMSR2 radiometer data, which uses various signature features for discrimination between thin and thick ice in the Arctic Ocean. The algorithm is applied under specific conditions to reduce misclassification of thick ice as thin ice. The average probability for misclassification in the daily chart is relatively low, showcasing the accuracy of ATIDA2 in ice classification.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Review
Geosciences, Multidisciplinary
Christopher R. Fielding, Tracy D. Frank, Lauren P. Birgenheier
Summary: A timeframe of glacial and nonglacial intervals in the Carboniferous and Permian systems of eastern Australia was published in 2008. It has been widely used to understand glacial events in the region and compare with events in other parts of the world. This paper presents a reappraisal of the previous timeframe based on new age data and presents updated information on the timing of glaciations and climate changes in eastern Australia.
EARTH-SCIENCE REVIEWS
(2023)
Article
Environmental Sciences
Bin Wang, Xiao Zhou, Qinghua Ding, Jiping Liu
Summary: The study investigates the uncertainties in predicting the first ice-free Arctic summer by identifying two key constraints: Arctic sea ice sensitivity and Arctic amplification sensitivity. The research finds that ten models with realistic sensitivity predict the occurrence of an ice-free Arctic under a medium emission scenario with 80% likelihood. The physics-based emergent constraints through numerical experiments may be crucial in enhancing robust projection and understanding sources of uncertainty in various fields.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
S. E. Armistead, A. S. Collins, S. Buckman, R. Atkins
Summary: Using U-Pb zircon LA-ICP-MS data, an age of 788 +/- 6 Ma has been determined for the eruption of the bimodal Boucaut Volcanics within the Neoproterozoic Adelaide Rift Complex. This age determination is important for constraining the timing of stratigraphy within the Adelaide Superbasin and has implications for plate tectonic reconstructions of Australia and Laurentia, as well as for correlating global isotope anomalies for the Neoproterozoic.
AUSTRALIAN JOURNAL OF EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Angus L. Nixon, Stijn Glorie, Alan S. Collins, Jo A. Whelan, Barry L. Reno, Martin Danisik, Benjamin P. Wade, Geoff Fraser
Summary: The study presents geological data from Pine Creek Orogen and Arnhem Province in northern Australia, revealing the thermal history and deformation characteristics of these areas, showcasing some significant previously unnoticed findings.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2021)
Article
Geosciences, Multidisciplinary
Andrew S. Merdith, Simon E. Williams, Alan S. Collins, Michael G. Tetley, Jacob A. Mulder, Morgan L. Blades, Alexander Young, Sheree E. Armistead, John Cannon, Sabin Zahirovic, R. Dietmar Mueller
Summary: Recent progress in plate tectonic reconstructions has expanded beyond continental drift to reconstruct the full evolving configuration of tectonic plates and plate boundaries. A continuous full-plate model spanning 1 billion years to present-day has been developed, incorporating a revised model for the Neoproterozoic-Cambrian period and connecting it with models of the Phanerozoic. The model is geologically constrained and based on preserved data from past plate boundaries, with the goal of providing a detailed and self-consistent tectonic reconstruction for the last billion years of Earth's history.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geochemistry & Geophysics
Sheree E. Armistead, Alan S. Collins, Renata S. Schmitt, Raisa L. Costa, Bert De Waele, Theodore Razakamanana, Justin L. Payne, John D. Foden
Summary: The study compared Paleoproterozoic sedimentary sequences in Madagascar, Africa, and India using detrital zircon U-Pb and Hf data, revealing similarities in age and isotopic characteristics. A new concept of the Greater Itremo Basin was proposed to explain the extensive sedimentary coverage in late Paleoproterozoic Madagascar. The research also suggested a new Paleoproterozoic plate tectonic configuration where central Madagascar is connected to the Tanzania Craton and Southern Granulite Terrane.
Article
Geosciences, Multidisciplinary
P. A. Hall, D. M. McKirdy, G. P. Halverson, J. B. Jago, A. S. Collins
Summary: The study in the lower Cambrian marine sediments of the Stansbury Basin in South Australia utilized trace and rare earth element abundances, total organic carbon contents, and pyritic sulfur isotopic compositions to reveal the association between trace elements and organic matter, the relative depletion of heavy REEs and yttrium compared to light REEs, and the evolution of provenance from southerly derived sources. Additionally, it suggested that the prevailing paleoredox regime for the Heatherdale Shale and the Talisker Formation was dysoxic, with a gradual decline in delta S-34(py), while the Emu Bay Shale accumulated beneath an oxic water column. Similarities in trace element chemistry between the Paleo-Pacific and Asian oceans were also highlighted, as seen in comparisons with sequences on the Yangtze Platform in South China.
AUSTRALIAN JOURNAL OF EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Romana E. C. Dew, Alan S. Collins, Christopher K. Morley, Rosalind C. King, Noreen J. Evans, Stijn Glorie
Summary: This study focuses on the U-Pb and Lu-Hf isotopic information of detrital zircons from Paleozoic and Mesozoic sedimentary rocks obtained from the Sibumasu Terrane in northwest Thailand. The results reveal a temporal change in detrital ages from older Paleozoic sequences to latest Permian-Triassic units associated with Indosinian zircon sources.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
R. L. Costa, R. S. Schmitt, A. S. Collins, S. E. Armistead, I. Gomes, D. B. Archibald, T. Razakamanana
Summary: Central and southern Madagascar are composed of distinctive Archaean crustal blocks overlain by Proterozoic supracrustal sequences. Through the analysis of detrital and metamorphic zircon grains, the depositional ages and sources of these rock sequences have been revealed.
JOURNAL OF AFRICAN EARTH SCIENCES
(2021)
Article
Geology
Daniel P. Le Heron, Christoph Kettler, Neil P. Griffis, Pierre Dietrich, Isabel P. Montanez, David A. Osleger, Axel Hofmann, Guilhem Douillet, Roland Mundil
Summary: This paper investigates the nature of contact between glacial rocks and underlying lithologies in different regions of southern Africa, revealing the processes and characteristics of ice mass expansion in different geographical areas. The study provides important insights into the geomorphological evolution during the glacial age.
DEPOSITIONAL RECORD
(2022)
Article
Geosciences, Multidisciplinary
Daniel Paul Le Heron, Christoph Kettler, Bethan J. Davies, Lars Scharfenberg, Lukas Eder, Michael Ketterman, Gerit E. U. Griesmeier, Rhiannon Quinn, Xiaoshuai Chen, Thomas Vandyk, Marie E. Busfield
Summary: The Gepatsch Glacier in Tirol, Austria has undergone significant changes in its forefield over a 12-month period, with alterations in both sediment and landforms. This study quantifies the rates of erosion and deposition in a complex proglacial setting, providing valuable insights into glaciation processes.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2022)
Article
Geology
Daniel Paul Le Heron, Christoph Kettler, Arian Wawra, Martin Schoepfer, Bernhard Grasemann
Summary: The Pasterze, Austria's largest glacier, is rapidly melting and retreating. Recent sedimentary deposits, which have not been studied before, provide important insights into the distribution of facies expected from a dying valley glacier.
DEPOSITIONAL RECORD
(2022)
Article
Geochemistry & Geophysics
A. L. Nixon, S. Glorie, N. Fernie, M. Hand, A. T. De Vries Van Leeuwen, A. S. Collins, D. Hasterok, G. Fraser
Summary: This study reveals considerable Paleozoic reactivation in central Australia, with low-temperature cooling in the Tennant region and Murphy Province during the Alice Springs Orogeny, and Triassic reactivation in the Aileron Province corresponding to the Hunter-Bowen Orogeny. The susceptibility of the Aileron Province to reactivation is attributed to high heat production and metasomatism.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Ahmad Redaa, Juraj Farkas, Sarah Gilbert, Alan S. Collins, Stefan Lohr, Davood Vasegh, Marnie Forster, Morgan Blades, Thomas Zack, Andrea Giuliani, Roland Maas, Andre Baldermann, Martin Dietzel, Dieter Garbe-Schoenberg
Summary: Reference materials with well-characterised composition are essential for reliable isotopic analyses of geological samples. However, there is a general lack of suitable reference materials for in situ Rb-Sr dating of silicate minerals. This study analyzed and tested four pressed nano-powder pellets as RMs, and concluded that only two of them (Mica-Mg-NP and GL-O-NP) were suitable for in situ dating applications, providing accurate Rb-Sr ages for phlogopite, glauconite, and biotite.
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
(2023)
Review
Environmental Sciences
Maria Seton, Simon E. E. Williams, Mathew Domeier, Alan S. S. Collins, Karin Sigloch
Summary: The development of advanced plate tectonic reconstruction software has greatly increased its generation and use in the Earth science community. This Technical Review provides a guide for quantitative plate reconstructions and their applications. While plate reconstructions allow scientists to investigate Earth evolution, their limitations and simplification of reality should be considered.
NATURE REVIEWS EARTH & ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Jarred C. Lloyd, Wolfgang V. Preiss, Alan S. Collins, Georgina M. Virgo, Morgan L. Blades, Sarah E. Gilbert, Darwinaji Subarkah, Carmen B. E. Krapf, Kathryn J. Amos
Summary: The glaciogenic nature of the Yudnamutana Subgroup and its global significance have been recognized for over a century, leading to the Sturtian Glaciation and Snowball Earth theory. However, debates on the origin and timing of these rocks have persisted. This study presents a detrital zircon study, compiles existing global geochronology, and revises the lithostratigraphic framework of the Yudnamutana Subgroup, showing that the Sturt Formation was deposited within the globally defined Sturtian Glaciation time span.
GEOLOGICAL MAGAZINE
(2023)
Article
Geosciences, Multidisciplinary
Jarred C. Lloyd, Alan S. Collins, Morgan L. Blades, Sarah E. Gilbert, Kathryn J. Amos
Summary: The Adelaide Superbasin in Australia is one of the largest and best-preserved rift systems that formed during the breakup of Rodinia. Through the study of new detrital zircon age data and existing literature, a new model for the early evolution of the superbasin is proposed. The model suggests that the basin went through two phases of rift activity and formed by propagating towards an apparent triple junction.
