نتایج جستجو برای: geochronology
تعداد نتایج: 1891 فیلتر نتایج به سال:
This paper presents U, Pb isotopic data of synthetic EARTHTIME solutions and natural reference materials together with suggestions how to ensure long-term intra- inter-laboratory reproducibility high-precision TIMS U–Pb geochronology.
Abstract. The ability to constrain the age of calcite formation is great utility Earth science community, due ubiquity across a wide spectrum geological systems. Here, we present first in situ laser ablation inductively coupled tandem quadrupole mass spectrometry (LA-ICP-MS/MS) Lu–Hf ages for calcite, demonstrating geologically meaningful iron oxide copper gold (IOCG) and skarn mineralisation, ...
Apatite is increasingly used in sedimentary provenance studies. However, detrital apatite U–Pb geochronology can be challenging due to the presence of non-radiogenic Pb, its intermediate closure temperature (~350–550°C) and/or age-resetting by metamorphic/metasomatic processes. The Lu–Hf system has a higher (~675–750°C) and is, therefore, more robust thermal resetting. Here we present first age...
The Strickland River is the primary sediment source for the Fly River system, a large tropical river that ranks in the global top 20 for both water and sediment discharge. Over the past decade the Strickland sediment discharge has been gauged at many locations. Comprehensive studies are now underway to study the delivery, transport, and storage of sediment throughout this system. A key question...
Knowledge of seabed dynamics in nearshore environments is needed to address problems ranging from to the evolution of coastal geomorphology to the changing nature of seabed acoustical properties. One successful approach, used primarily in fine-grained sedimentary environments, has been the application short-lived particle-reactive radioisotopes to quantify sediment deposition and accumulation r...
Abstract Introduction Regional geology of eastern Africa Rukwa Rift Basin Rift stratigraphy, sedimentation and palaeontology Volcanism and geochronology Provenance, drainage patterns and uplift Methods References Acknowledgements Author information Supplementary informationIntroduction Regional geology of eastern Africa Rukwa Rift Basin Rift stratigraphy, sedimentation and palaeontology Volcani...
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