A5088451020- Paleontology and Stratigraphy of Fossils
- Geochemistry and Elemental Analysis
- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Mine drainage and remediation techniques
- Mineral Processing and Grinding
- earthquake and tectonic studies
- Origins and Evolution of Life
- Underground infrastructure and sustainability
- Radioactive element chemistry and processing
- Geological and Geophysical Studies
- Mining Techniques and Economics
- Integrated Energy Systems Optimization
- Cultural and Social Studies in Latin America
- Anthropological Studies and Insights
- Land Use and Ecosystem Services
- Mercury impact and mitigation studies
- Latin American Cultural Politics
- Philippine History and Culture
- Geological formations and processes
- Youth Culture and Social Dynamics
- World Systems and Global Transformations
- Concrete Properties and Behavior
UNSW Sydney
2024
Visva-Bharati University
2024
University of Strathclyde
2024
Environmental Earth Sciences
2024
University of Tasmania
2015-2023
University of Toronto
2023
ORCID
2020
University of Delhi
2018
Jawaharlal Nehru University
2015-2017
National Geophysical Research Institute
2014
Trace element concentrations in marine pyrite, measured by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS), have the potential to open a new window into deep-time ocean chemistry, atmosphere oxygenation, and genesis of basin-hosted ore deposits. Only early-formed syngenetic early diagenetic pyrite preserves trace chemistry past oceans, as late metamorphic recrystallization changes budget. A database over 5,000 analyses LA-ICP-MS has enabled development proxies for...
Abstract The period 1800 to 800 Ma (“Boring Billion”) is believed mark a delay in the evolution of complex life, primarily due low levels oxygen atmosphere. Earlier studies highlight remarkably flat C, Cr isotopes and trace element trends during so-called stasis, caused by prolonged nutrient, climatic, atmospheric tectonic stability. In contrast, we suggest first-order variability bio-essential availability oceans combining systematic sampling Proterozoic rock record with sensitive...
The great oxygenation event (GOE), the first of two major rises in atmospheric oxygen Earth history, was initially placed near Archean-Proterozoic boundary (∼2500 Ma). More recently, position GOE has been moved to between 2500 and 2300 Ma so as coincide with loss MIF sulfur isotope signal due creation Earth's ozone layer at that time. Here we present a revised interpretation history Archean Proterozoic, based on multi-geochemical proxy approach. Integration large database analyses redox...
Abstract Redox-sensitive trace elements and sulfur isotope compositions obtained via in situ analyses of sedimentary pyrites from marine black shales are used to track atmosphere-ocean redox conditions between ∼1730 ∼1360 Ma the McArthur Basin, northern Australia. Three shale formations within basin (Wollogorang Formation 1730 ± 3 Ma, Barney Creek 1640 Upper Velkerri 1361 21 Ma) display systematic stratigraphic variations pyrite trace-element using LA-ICP-MS. The concentrations several their...
Abstract The source of fluids and their mechanism metal precipitation in sediment-hosted, disseminated orogenic gold deposits are ambiguous. Pyrite texture, trace element, S, Pb, He-Ar isotope compositions sulfides C-O data calcite from Chang'an deposit the Ailaoshan belt, southwest (SW) China, were studied to provide a new genetic model for sediment-hosted deposit, furthering knowledge precipitation. Orebodies at mainly hosted by Ordovician turbidite with few Oligocene syenite. Two stages...
Abstract The significance of trace elements in initiating origins and driving evolution life on Earth is indisputable. Trace element (TE) trends the oceans through time broadly reflect their availability allow speculation all possible influences early life. A comprehensive sedimentary pyrite–TE database, covering 3000 m.y. Precambrian, has improved our understanding sequence bio-essential TE ocean. This study probed how changing (and scarcity) critical TEs marine environment influenced...
Abstract Pyrite is a common mineral in sedimentary rocks and the major host for many chalcophile trace elements utilized as important tracers of evolution ancient hydrosphere. Measurement element composition pyrite challenging due to fine-grain size intergrowth with silicate matrix other sulfide minerals. In this contribution, we describe method calculation from time-resolved LA-ICP-MS data. The involves an analysis both pyrite-free sediment matrix, segmentation spectra, normalization total,...
The Mount Bruce Supergroup (MBS) in Western Australia has been central to debates surrounding Precambrian stratigraphic subdivision and is one of the few relatively conformable successions that records both chronometric Archean-Proterozoic boundary (APB) Great Oxidation Event/Episode (GOE) which previously proposed as most practical basis for a chronostratigraphic boundary. Current understanding lithostratigraphy, chemostratigraphy, geochronology MBS supports placement APB vicinity contact...
The Vindhyan Basin in central India preserves a thick (~5 km) sequence of sedimentary and lesser volcanic rocks that provide valuable archive part the Proterozoic (~1800–900 Ma) India. Here, we present an analysis key pyrite textures their trace element sulfur isotope compositions Bijaigarh Shale (1210 ± 52 Supergroup, using reflected light microscopy, LA-ICP-MS SHRIMP-SI, respectively. A variety (fine-grained disseminated to aggregates, framboids, lags, possibly microbial textures) are...