scholarly journals Constraining the tectonic setting of continental crust formation from coupled in situ Rb-Sr dating and Pb isotopic analysis of detrital, single K-feldspar grains

2021 ◽  
Author(s):  
Dan Bevan ◽  
Christopher Coath ◽  
Jamie Lewis ◽  
Daniel Stubbs ◽  
Joel Rodney ◽  
...  
Keyword(s):  
Continental Crust ◽  
Tectonic Setting ◽  
Isotopic Analysis ◽  
Crust Formation

Laboratory and in-situ analysis of comet dust

1988 ◽  
Vol 46 ◽  
pp. 8-9
Author(s):  
D.E. Brownlee ◽  
A.L. Albee
Keyword(s):  
Electron Microscopy ◽  
Solar System ◽  
Laboratory Study ◽  
Isotopic Analysis ◽  
Building Blocks ◽  
Sem Analysis ◽  
Early Solar System ◽  
Cometary Material ◽  
Comet Dust

Comets are primitive, kilometer-sized bodies that formed in the outer regions of the solar system. Composed of ice and dust, comets are generally believed to be relic building blocks of the outer solar system that have been preserved at cryogenic temperatures since the formation of the Sun and planets. The analysis of cometary material is particularly important because the properties of cometary material provide direct information on the processes and environments that formed and influenced solid matter both in the early solar system and in the interstellar environments that preceded it.The first direct analyses of proven comet dust were made during the Soviet and European spacecraft encounters with Comet Halley in 1986. These missions carried time-of-flight mass spectrometers that measured mass spectra of individual micron and smaller particles. The Halley measurements were semi-quantitative but they showed that comet dust is a complex fine-grained mixture of silicates and organic material. A full understanding of comet dust will require detailed morphological, mineralogical, elemental and isotopic analysis at the finest possible scale. Electron microscopy and related microbeam techniques will play key roles in the analysis. The present and future of electron microscopy of comet samples involves laboratory study of micrometeorites collected in the stratosphere, in-situ SEM analysis of particles collected at a comet and laboratory study of samples collected from a comet and returned to the Earth for detailed study.

In situ isotopic analysis of uranium using a new data acquisition protocol for 1013 ohm Faraday amplifiers

2021 ◽  
Author(s):  
Kota Yamamoto ◽  
Hisashi Asanuma ◽  
Hiroaki Takahashi ◽  
Takafumi Hirata
Keyword(s):  
Data Acquisition ◽  
Data Reduction ◽  
Reduction Method ◽  
Isotopic Analysis ◽  
High Gain ◽  
Transient Signals ◽  
Acquisition Protocol ◽  
Data Reduction Method ◽  
Isotopic Measurements

New data reduction method for isotopic measurements using high-gain Faraday amplifiers enables precise uranium isotopic analysis even from transient signals.

scholarly journals Tectonic settings of continental crust formation: Insights from Pb isotopes in feldspar inclusions in zircon

Geology ◽  
2016 ◽  
Vol 44 (10) ◽  
pp. 819-822 ◽  
Author(s):  
Hélène Delavault ◽  
Bruno Dhuime ◽  
Chris J. Hawkesworth ◽  
Peter A. Cawood ◽  
Horst Marschall ◽  
...  
Keyword(s):  
Continental Crust ◽  
Pb Isotopes ◽  
Crust Formation ◽  
Tectonic Settings

Global factors of lead-zinc ore formation

2019 ◽  
pp. 3-10
Author(s):  
A. L. Dergachev
Keyword(s):  
Continental Crust ◽  
Island Arcs ◽  
Geological Time ◽  
Crust Formation ◽  
Ore Formation ◽  
Global Factor ◽  
Lead And Zinc ◽  
Lead Zinc ◽  
Cyclic Changes

Tectonic evolution of the Earth is a principle global factor responsible for uneven distribution of lead and zinc reserves in geological time. Cyclic changes in productivity of lead-zinc ore-formation processes resulted from periodical amalgamation of most blocks of continental crust, formation, stabilization and final break-up of supercontinents. Many features of age spectrums of lead and zinc reserves are caused by gradual increase of volume of continental crust resulting from accretion of island arcs to ancient cratons, widening of distribution of ensialic environments of ore-formation and increasing role of continental crust in magmatic processes.

Mechanism of Paleoarchean continental crust formation as archived in granitoids from northern part of Singhbhum Craton, eastern India

2020 ◽  
pp. SP489-2019-202
Author(s):  
Sukanta Dey ◽  
Sibani Kumari Nayak ◽  
Aniruddha Mitra ◽  
Keqing Zong ◽  
Yongsheng Liu
Keyword(s):  
Continental Crust ◽  
Eastern India ◽  
Crust Formation ◽  
Singhbhum Craton
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