Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) was used to analyze chemical elements—major, trace and rare earth elements (REE) concentrations, augmented with quantitative X-ray diffraction (XRD) analysis and ...Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) was used to analyze chemical elements—major, trace and rare earth elements (REE) concentrations, augmented with quantitative X-ray diffraction (XRD) analysis and thin-section petrography for mineralogical characterization of the Triassic Montney Formation in northeastern British Columbia, Western Canada Sedimentary Basin (WCSB). Results from this study indicate that integration of chemical elements with mineralogy shows affinity to the host lithologies. Evidently, chemical elements are the building blocks for minerals, thus, their significances in the interpretation of geological systems are unambiguous. Herein, major elements concentration such as Al, Fe, K, Mg, Ca, Mn in the samples analyzed from the Montney Formation are interpreted as: 1) indication of dolomitization and diagenesis;2) trace elements—Rb, Th, U, and Cs are related to the organic matter—kerogen in the clay component of the Montney Formation source rock;and 3) transition metals—Sc, V, Co, Cr, Zn show strong affinity with diagenesis in the study interval.展开更多
We report on the application of Laser Induced Breakdown Spectroscopy(LIBS)technique to the study of Ca,P,Zn and Sr evolutions for adult caries-affected teeth using nanosecond laser pulses.The aim of this work is to be...We report on the application of Laser Induced Breakdown Spectroscopy(LIBS)technique to the study of Ca,P,Zn and Sr evolutions for adult caries-affected teeth using nanosecond laser pulses.The aim of this work is to better understand the behaviors of Zn and Sr as trace-elements in the caries eruption with respect to the behaviors of one of the main compounds of the hydroxyapatite crystal which is the calcium.The study was focused on the investigation of these elements’evolutions from three parts of the enamel surfaces of twenty two adult caries-affected teeth;the healthy part,the dental plaque part and the caries-affected part.The decrease rates of Zn,Sr and P was,also,compared to the Ca one.Comparison concerned normalized emission line intensities.For every species,normalization was done relatively to the emission line intensities of the healthy part.Results showed that abundances of these elements decrease similarly from the healthy parts to the affected-caries parts.The higher decrease rate was noticed for the calcium.The evolutions of Zn and Sr for the three parts of the teeth surfaces cannot inform about the substitution of the calcium by these trace-elements,however the comparison of their decrease rates to the calcium one can be considered as a valuable index of this substitution.展开更多
Detrital zircon U/Pb geochronology is a common tool used to resolve stratigraphic questions,inform basin evolution and constrain regional geological histories.In favourable circumstances,detrital zircon populations ca...Detrital zircon U/Pb geochronology is a common tool used to resolve stratigraphic questions,inform basin evolution and constrain regional geological histories.In favourable circumstances,detrital zircon populations can contain a concomitant volcanic contribution that provides constraints on the age of deposition.However,for non-volcanic settings,proving isolated detrital zircon grains are from contemporaneous and potentially remote volcanism is challenging.Here we use same grain(U-Th)/He thermochronology coupled with U/Pb geochronology to identify detrital zircon grains of contemporary volcanic origin.(U-Th)/He ages from Cretaceous zircon grains in southern Australia define a single population with a weighted mean age of 104±6.1 Ma.indistinguishable from zircon U/Pb geochronology and palynology(~104.0-107.5 Ma).Detrital zircon trace-element geochemistry is consistent with a continental signature for parent rocks and coupled with detrital grain ages,supports derivation from a>2000 km distant early-to mid-Cretaceous Whitsunday Volcanic Province in eastern Australia.Thus,integration of biostratigraphy,single-grain zircon double-dating(geochronology and thermochronology)and grain geochemistry enhances fingerprinting of zircon source region and transport history.A distal volcanic source and rapid continental-scale transport to southern Australia is supported here.展开更多
Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)<span style="font-size:12px;font-family:Verdana;"><span style="font-size:12px;font-family:Verdana;"> </span></span><s...Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)<span style="font-size:12px;font-family:Verdana;"><span style="font-size:12px;font-family:Verdana;"> </span></span><span style="font-size:12px;font-family:Verdana;">was used to analyze </span><span style="font-size:10pt;font-family:'}', serif;"><span style="font-size:12px;font-family:Verdana;">chemical elements—</span><span style="font-size:12px;font-family:Verdana;">major, trace and rare earth elements</span><span style="font-size:12px;font-family:Verdana;"> </span><span style="font-size:12px;font-family:Verdana;">(REE) concentrations, </span></span><span style="font-size:10.0pt;font-family:" color:#222222;"=""><span style="font-size:12px;font-family:Verdana;">augmented with quantitative X-ray diffraction (XRD) analysis and thin-section petrography for</span><span style="font-size:12px;font-family:Verdana;"> </span></span><span style="font-size:10pt;font-family:'}', serif;"><span style="font-size:12px;font-family:Verdana;">mineralogical characterization of the Triassic Montney Formation in northeastern British Columbia, Western Canada Sedimentary</span><span style="font-size:12px;font-family:Verdana;"> </span><span style="font-size:12px;font-family:Verdana;">Basin (WCSB). Results from this study indicate</span><span style="font-size:12px;font-family:Verdana;"> </span><span style="font-size:12px;font-family:Verdana;">that integration of chemical elements with mineralogy shows affinity to the host lithologies. Evidently, chemical elements are the building blocks for minerals, thus, their significances</span><span style="font-size:12px;font-family:Verdana;"> </span><span style="font-size:12px;font-family:Verdana;">in the interpretation of geological systems are unambiguous. Herein, major elements concentration such as Al, Fe, K, Mg, Ca, Mn in the samples analyzed from the Montney Formation are interpreted as: 1) indication of dolomitization and diagenesis;2) trace elements—Rb, Th, U, and Cs are related to the organic matter—kerogen in the clay component of 展开更多
文摘Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) was used to analyze chemical elements—major, trace and rare earth elements (REE) concentrations, augmented with quantitative X-ray diffraction (XRD) analysis and thin-section petrography for mineralogical characterization of the Triassic Montney Formation in northeastern British Columbia, Western Canada Sedimentary Basin (WCSB). Results from this study indicate that integration of chemical elements with mineralogy shows affinity to the host lithologies. Evidently, chemical elements are the building blocks for minerals, thus, their significances in the interpretation of geological systems are unambiguous. Herein, major elements concentration such as Al, Fe, K, Mg, Ca, Mn in the samples analyzed from the Montney Formation are interpreted as: 1) indication of dolomitization and diagenesis;2) trace elements—Rb, Th, U, and Cs are related to the organic matter—kerogen in the clay component of the Montney Formation source rock;and 3) transition metals—Sc, V, Co, Cr, Zn show strong affinity with diagenesis in the study interval.
文摘We report on the application of Laser Induced Breakdown Spectroscopy(LIBS)technique to the study of Ca,P,Zn and Sr evolutions for adult caries-affected teeth using nanosecond laser pulses.The aim of this work is to better understand the behaviors of Zn and Sr as trace-elements in the caries eruption with respect to the behaviors of one of the main compounds of the hydroxyapatite crystal which is the calcium.The study was focused on the investigation of these elements’evolutions from three parts of the enamel surfaces of twenty two adult caries-affected teeth;the healthy part,the dental plaque part and the caries-affected part.The decrease rates of Zn,Sr and P was,also,compared to the Ca one.Comparison concerned normalized emission line intensities.For every species,normalization was done relatively to the emission line intensities of the healthy part.Results showed that abundances of these elements decrease similarly from the healthy parts to the affected-caries parts.The higher decrease rate was noticed for the calcium.The evolutions of Zn and Sr for the three parts of the teeth surfaces cannot inform about the substitution of the calcium by these trace-elements,however the comparison of their decrease rates to the calcium one can be considered as a valuable index of this substitution.
基金funded via an Australian Geophysical Observing System grant provided to AuScope Pty Ltd.by the AQ44 Australian Education Investment Fund programPart of this research was undertaken using the EM instrumentation(ARC LE130100053)at the John de Laeter Centre,Curtin Universitysupported byARC Discovery funding scheme(DP160102427)
文摘Detrital zircon U/Pb geochronology is a common tool used to resolve stratigraphic questions,inform basin evolution and constrain regional geological histories.In favourable circumstances,detrital zircon populations can contain a concomitant volcanic contribution that provides constraints on the age of deposition.However,for non-volcanic settings,proving isolated detrital zircon grains are from contemporaneous and potentially remote volcanism is challenging.Here we use same grain(U-Th)/He thermochronology coupled with U/Pb geochronology to identify detrital zircon grains of contemporary volcanic origin.(U-Th)/He ages from Cretaceous zircon grains in southern Australia define a single population with a weighted mean age of 104±6.1 Ma.indistinguishable from zircon U/Pb geochronology and palynology(~104.0-107.5 Ma).Detrital zircon trace-element geochemistry is consistent with a continental signature for parent rocks and coupled with detrital grain ages,supports derivation from a>2000 km distant early-to mid-Cretaceous Whitsunday Volcanic Province in eastern Australia.Thus,integration of biostratigraphy,single-grain zircon double-dating(geochronology and thermochronology)and grain geochemistry enhances fingerprinting of zircon source region and transport history.A distal volcanic source and rapid continental-scale transport to southern Australia is supported here.
文摘Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)<span style="font-size:12px;font-family:Verdana;"><span style="font-size:12px;font-family:Verdana;"> </span></span><span style="font-size:12px;font-family:Verdana;">was used to analyze </span><span style="font-size:10pt;font-family:'}', serif;"><span style="font-size:12px;font-family:Verdana;">chemical elements—</span><span style="font-size:12px;font-family:Verdana;">major, trace and rare earth elements</span><span style="font-size:12px;font-family:Verdana;"> </span><span style="font-size:12px;font-family:Verdana;">(REE) concentrations, </span></span><span style="font-size:10.0pt;font-family:" color:#222222;"=""><span style="font-size:12px;font-family:Verdana;">augmented with quantitative X-ray diffraction (XRD) analysis and thin-section petrography for</span><span style="font-size:12px;font-family:Verdana;"> </span></span><span style="font-size:10pt;font-family:'}', serif;"><span style="font-size:12px;font-family:Verdana;">mineralogical characterization of the Triassic Montney Formation in northeastern British Columbia, Western Canada Sedimentary</span><span style="font-size:12px;font-family:Verdana;"> </span><span style="font-size:12px;font-family:Verdana;">Basin (WCSB). Results from this study indicate</span><span style="font-size:12px;font-family:Verdana;"> </span><span style="font-size:12px;font-family:Verdana;">that integration of chemical elements with mineralogy shows affinity to the host lithologies. Evidently, chemical elements are the building blocks for minerals, thus, their significances</span><span style="font-size:12px;font-family:Verdana;"> </span><span style="font-size:12px;font-family:Verdana;">in the interpretation of geological systems are unambiguous. Herein, major elements concentration such as Al, Fe, K, Mg, Ca, Mn in the samples analyzed from the Montney Formation are interpreted as: 1) indication of dolomitization and diagenesis;2) trace elements—Rb, Th, U, and Cs are related to the organic matter—kerogen in the clay component of
