Long Tao

Institute of geology CAGS

We carried out a petrological, mineralogical, and geochemical study of fragmental and regolith breccia clasts separated from two Chang'e-5 (CE-5) soil samples, CE5C0000YJYX03501GP and CE5C0400, which provide an opportunity to investigate the compositional change of regolith at the landing site through time. Fragmental breccia CE-5-B3 contains a div...

Impact glasses found in lunar soils provide a possible window into the impact history of the inner solar system. However, their use for precise reconstruction of this history is limited by an incomplete understanding of the physical mechanisms responsible for their origin and distribution and possible relationships to local and regional geology. He...

The arsenic (As) methylation capacity is an important determinant of susceptibility to As-related diseases. Total As (TAs) or inorganic As (iAs) was reported to associated with As methylation capacity. We measured urinary concentrations of iAs, monomethylarsonic acid (MMA), and dimethylarsinic acid (DMA) by using HPLC-HG-AFS and calculated the prim...

Sample return shows late lunar volcanism Measuring physical samples of Solar System bodies in the laboratory provides more information than is possible from remote sensing alone. In December 2020, the Chang’e-5 mission landed on the Moon, collected samples, and returned them to Earth. Che et al . analyze two fragments of volcanic lunar basalt colle...

The arsenic (As) methylation capacity is an important determinant of the susceptibility to arsenic-related diseases. Total As (TAs) or inorganic As (iAs) was reported to associate with As methylation capacity individually, however, influencing trend and extent of their combined exposure levels on methylation capacity remains poorly understood. We m...

Silicate-bearing iron meteorites record metal–silicate separation and mixing processes of planetesimals. Of particular interest is the IIE group as its silicate inclusions show great petrological diversity, probably resulting from the complex petrogenesis involving early differentiation and impact-induced dynamic mixing, re-melting, and reduction....

Since the Apollo 14 mission delivered samples of the Fra Mauro formation, interpreted as ejecta of the Imbrium impact, defining the age of this impact has emerged as one of the critical tasks required for the complete understanding of the asteroid bombardment history of the Moon and, by extension, the inner Solar System. Significant effort dedicate...

The effect of light therapy in treating seasonal affective disorder has been demonstrated among previous studies. However, the effect of light therapy in treating non-seasonal depression remains unclear. This meta-analysis aimed to determine the efficacy of light therapy in non-seasonal depression. We searched for randomized controlled trials (RCTs...

A new TOF-SIMS with high spatial and mass resolution has been constructed and applied to the in-situ micro-scale analysis of trace elements in geological materials with complex structural and chemical features. Double second-order reflectrons without mesh between different electric field regions of achieve greatly improved secondary ion transmissio...

An electron impact ion source-adopted magnetic field-enhanced technology has been designed for enhancing the electron intensity and the ionization efficiency. Based on the ion optic focus mechanism, an electron impact ionization source was designed, and the electron entrance into the ionization chamber was designed with a hollow cylinder structure...

The ion transformation efficiency from a high-pressure ion source region to a low-pressure mass analysis region is one of the important indices for the mass spectrometer performance. To decrease the ion loss and improve the sensitivity of ions, a radiofrequency driver was designed in a home-made time-of-flight mass spectrometer (TOF-MS), which adop...

A high spatial resolution and high brightness ion beam from a cold cathode duoplasmatron source and primary ion optics are presented and applied to in-situ analysis of micro-scale geological material with complex structural and chemical features. The magnetic field in the source as well as the influence of relative permeability of magnetic material...

Sensitive high resolution ion microprobe (SHRIMP) IIe MC has been widely used in the oxygen isotopes analysis of zircon, apatite, calcium carbonate, etc. This study described the procedures for SHRIMP IIe MC high precision O-isotope analysis. We simulated the SHRIMP II secondary extraction system using SIMION and discussed the cause and influence f...