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太行神仙山髫髻山组火山岩锆石SHRIMP U-Pb年龄及其地质意义

This age indicates adiabatic decompression and a metamorphic event associated with rapid uplift of granulites in a tectonic environment resulted from the collision between India and Eurasia, synchronous with large-scale thrusting, extension, detachment as well as emplacement of leucogranite. In summary,dating results show that granulites in this area underwent multiphase metamorphism and complex geological evolution. SHRIMP U-Pb dating on hydrothermal zircons from auriferous quartz veins could be used to constrain the timing of lode gold mineralization and the relationship to relevant hydrothermal event.

Basalt and basaltic andesite metamorphosed at greenschist facies occurs with conglomerate layers at the bottom of the Paleoproterozoic Hutuo Group in the Wutai Mountains area, North China Craton. Detailed geological surveying confirms that these volcanic rocks are conformable within the neighboring sedimentary rocks. The latter is interpreted as the eruption age of the basaltic andesite, and gives the age of the base of the Hutuo Group.

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SHRIMP is an analytical instrument that the Australian National University ANU has begun to develop since , and secondary ion mass spectrometry to analyze the secondary ions generated by irradiating a primary ion beam on the sample surface. SHRIMP has specialized in carrying out the analysis of minute areas by particular focused ion beam, and is referred to as “ion microprobe “. High secondary ion detection sensitivity and high mass and spatial resolution enable to produce reliable data worldwide.

The secondary ion mass spectrometry is a technique of analysis in microscale of sample surface. The secondary ion, which is sputtered from sample surface by a focused ion beam primary ion beam in high vacuum, is analyzed. Therefore, it is possible to analyze sample as a solid without chemical treatment, such as sample dissolution and column separation.

How charged particles move in electromagnetic field is depend on the mass-to-charge ratio of the particles. By utilizing its properties, it is allowed to fly the charged particles in the field to determine the mass number from its orbit. It is widely applied in various fields, such as organic chemistry, biochemistry, and geochemistry. Primary column is a part for generating and adjusting the primary ion beam to ionize atoms of sample surface.

The primary ions are produced in ion source hollow cathode type duoplasmatron or Cs ion source and accelerated at a voltage of about V. It is adjusted by using ion optical lenses and deflectors, and then irradiated onto the sample surface. When introducing the sample into Source chamber, it is necessary to perform the preliminary evacuation in the Sample lock to keep the Source chamber at a high vacuum of about torr.


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SHRIMP U-Pb dating and Hf isotopic analyses of zircons from the mafic dyke swarms in central Qiangtang area, Northern Tibet []. Zhai, QingGuo Li, Cai.

Stella Poma 1 , Eduardo O. Mcnaughton curtin. Two episodes of different age and genesis have been identified. Hf isotope signature of the units indicates mantle sources as well as crustal components. The tectonic setting and age of the Gondwanan magmatism in NW Argentina allow to differentiate: a. Permian intra-plate magmatism developed under similar conditions to the upper section of the Choiyoi magmatism exposed in the Frontal Cordillera and San Rafael Block, Argentina; b.

Triassic magmatism belonging to a poorly known subduction-related magmatic arc segment of mostly NS trend with evidence of porphyry type mineralization in Chile, allowing to extend this metallotect into Argentina.

Canadian Journal of Earth Sciences

Arafura Basin. Bremer Sub-basin study. Nitrogen in estuaries. Diatoms and water quality. Geochronology boost.

SHRIMP U-Pb ages were determined on single zircon grains separated from combined samples (i.e. GA8-GA9) belonging to a trachytic andesite, Galalah area.

Formation age of metamorphic rocks occurred in Altai orogen of China has been questioned up to now, especially, since most part of metamorphic rocks were designated to be Paleo Proterozoic to Meso-Proterozoic metamorphic rocks by the geoscientific survey team of China-Kazakstan. Qinghe gneiss studied in this paper occurs in the southwest area to Qinghe County and locates in Erqishi shearing zone. Geochemical characteristics and Nd-Sr isotopic compositions of gneisses show formation in island arc setting.

Any older zircons or related Precambrian ages from the Qinghe gneiss have been never found in this study, consequently this result does not support opinion about formation of Qinghe gneiss in Precambrian. The available data confirm the time limit of a significant geological thermal event in the Altai Orogen during the early Permian. This precise and credible zircon SHRIMP age of the Qinghe gneiss possibly provides a primary evidence for study on time limit of closure of Paleo-Asia Ocean and continental thrust during the late Paleozoic.

Iraqi National Journal of Earth Sciences

Such a sophisticated ion probe, which can attain a high sensitivity at a high mass resolution, based on a double focusing high mass-resolution spectrometer, designed by Matsuda , was constructed at the Australian National University. Since its installation, our focus has been on the in-situ U—Pb dating of the mineral apatite, as well as zircon, which is a more common U-bearing mineral. In this paper, we review the methodology associated with in-situ apatite dating and our contribution to Earth and Planetary Science over the past 16 years.

Since the monumental studies reported in , 1 an enormous amount of work related to the Pb—Pb dating of meteorites has been reported via the use of TIMS Thermal Ionization Mass Spectrometry.

Zircon SHRIMP U-Pb dating of super-K alkali granites in Jinpin, Yunnan province in China, and its geological significance — Take Zircons from the.

Birger Rasmussen , Janet Muhling , I. Fletcher, Michael Wingate. In situ SHRIMP U-Pb dating of monazite integrated with petrology and textures: Does bulk composition control whether monazite forms in low-Ca pelitic rocks during amphibolite facies metamorphism. N2 – Bulk composition and specific reaction history among common silicate minerals have been proposed as controls on monazite growth in metapelitic rocks during amphibolite facies metamorphism.

It has also been implied that monazite that formed during greenschist facies metamorphism may be preserved unchanged under upper amphibolite facies conditions. If correct, this would make the interpretation of monazite ages in polymetamorphic rocks exceedingly difficult, because isotopic dates could vary significantly in rocks that have experienced identical metamorphic conditions but differ only slightly in whole-rock composition. Low-Ca pelitic schists from the Mount Barren Group in southwestern Australia display a range of whole-rock compositions in AFM space and different peak mineral assemblages resulting from amphibolite facies metamorphism similar to 8 kb, degrees C.

In this study, we test whether bulk composition controls the formation of monazite through geochronology and textural evidence linking monazite growth with deformation and peak metamorphism. X-ray element mapping of monazite from the metapelitic rocks reveals concentric zoning in many grains with distinct cores and rims. The growth monazite was widespread in low-Ca pelitic schists representing a broad range of compositions in AFM space, indicating that variations in bulk composition in AFM space did not control the formation of monazite during amphibolite facies metamorphism in the Mount Barren Group.

All rights reserved. AB – Bulk composition and specific reaction history among common silicate minerals have been proposed as controls on monazite growth in metapelitic rocks during amphibolite facies metamorphism. Overview Fingerprint. Abstract Bulk composition and specific reaction history among common silicate minerals have been proposed as controls on monazite growth in metapelitic rocks during amphibolite facies metamorphism.

In-Situ U-Pb Dating of Apatite by Hiroshima-SHRIMP: Contributions to Earth and Planetary Science.

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SHRIMP U-Pb dating on coesite-bearing zircon: Evidence for Indosinian ultrahigh-pressure metamorphism in Su-Lu, East China. Jingsui Yang, Zhiqin Xu, Cailai.

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Due to the unique location in the Ludong region, geochronological study of this area is essential for the understanding of the Cretaceous tectonic evolution of Eastern China.

Sedimentary sequences interbedded with tuff layers unconformably overlay metamorphic rocks in the Sulu Orogen. This research presents a more reliable geochronological dataset of a tuff layer on Lingshan Island in Qingdao. A total of valid age values from zircon grains were obtained in three fresh tuff samples. The spatial-temporal relationship between the tuff and the Mesozoic igneous rocks of Eastern China indicate the impact of the Pacific Plate subduction beneath the Asian continent.

Six Albian single detrital zircons have a weighted average age of The age sequence of four sections on Lingshan Island is defined in this study: sections A and B belong to the Laiyang Group, and sections C and D are considered the Qingshan Group and were deposited in the Late Cretaceous.

Sensitive high-resolution ion microprobe

We implement several procedures that help combat these analytical issues. Pb and U. To decrease molecular interferences at Pb peaks and increase the signal:noise ratio, we also use the energy filter to only accept high-energy ions into the collector. Because common lead and the amount of molecular interferences vary by sample, energy filtering is not always used.

Grey shaded area outlined in black represents published age of standard measured by TIMS Luvizotto et al.

Titanite composition and SHRIMP U–Pb dating as indicators of post-magmatic tectono-thermal activity: Variscan I-type tonalites to granodiorites.

Titanite crystals commonly shows oscillatory, sector and convolute irregular zonal textures, reflecting mainly variations in Ca and Ti versus Al 1—2 wt. Fluorine content is up to 0. Consequently, the textural, geochronological and compositional data indicate relatively high-temperature, most probably early post-magmatic subsolidus precipitation of titanite. Ackerson M. Aleinikoff J. Barboni M. Barrat J. Acta 83, 79— Bauer J. Bea F. Bernau R. In: Grecula P. Mineralia Slovaca Monographs , Bratislava, — Quarterly 55, 1—8.

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The Xilin Gol Complex, consisting of deformed and metamorphosed rocks, was exposed as a large geological unit within the Central Asian Orogenic Belt, but its forming and subsequent deformed and metamorphic time has been an issue of little consensus. Consequently, it is not the Precambrian terrane as previously considered by most geologists. More or less, the major rock — biotiteplagioclase gneiss within the Complex is more likely to be Paleozoic fore-arc turbidite formation before metamorphism and intensive deformation, in which the detrital zircons gave sporadic Precambrian ages as old as up to 3.

The source of the turbidite formation is multiple, which may be derived either from the North China Craton, or from the South-Mongolia Micro-continent, or probably came from a potential and undiscovered in situ terranes aged — Ma or even up to ca 3. This is a preview of subscription content, log in to check access.

Google Scholar. Shao, J. Tang, K. Xiao, X. Xu, B. Hao, X. Zhao, G. Chen, B.

Decay scheme of K-Ar, U-Pb, Rb-Sr and Sm-Nd isotopic systems

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