Lynthener Bianca Takenaka (now at CPRM, BR)

LYNTHENER BIANCA TAKENAKA DE OLIVEIRA

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GRADUATE STUDENT

DEPARTAMENTO DE GEOLOGIA

UNIVERSIDADE FEDERAL DE OURO PRETO

RESEARCH: GEOCRONOLOGY

PROJECT SUMMARY: Optimization of the U-Pb dating methodology by LA-ICP-MS: Applications to metabasic rocks of Rio das Velhas Supergroup basin.

LA-ICP-MS is considered the most efficient equipment to obtain instantaneously U-Pb data, with higher rates of material transference and a large number of analyses per day. Our study will use a modified LA-Q-ICP-MS method (with a low volume tear-drop shaped sample cell, a gas homogenizer and new analytical conditions) to improve sensitivity and signal stability, turning the counts per second higher on ²⁰⁴Pb, ²⁰⁶Pb, ²⁰⁷Pb, ²⁰⁸Pb, ²³²U and ²³⁸U masses, and to reduce laser ablation time. By testing different equipment configurations its possible to observe counts and errors, and then optimize the equipment in order to obtain more precise and accurate concordia ages, with larger counts and lower errors, acquiring then a more reliable data. This methodology will be then applied in heterogenic zircons of metabasic rocks from the Rio das Velhas Supergroup basin that round Bação, Bonfim and Belo Horizonte complexes, in order to acquire high quality and precise ages for studies about domes and keels in QF.

One of the Laser Ablation Q-ICP-MS systems that we develop for U-Pb zircon geochronolgy at AIR

CONTACTS:

CELL: (31) 9814-3432

EMAIL: lynthener100@yahoo.com.br or lynbianca@gmail.com

PUBLICATIONS:

Takenaka, L.B. , Lana, C., Nalini Júnior, H. A.,  Abreu, A.T., 2012.  A geocronologia das rochas do Arqueano do Quadrilátero Ferrífero. In: XX Seminário de Iniciação Científica (SEIC), Ouro Preto – MG.

Takenaka, L.B. , Martins M.E., Castro, T. A.,  Sartoretto, V. M., 2012. Projeto Expedição Geológica Turismo Geológico na Cidade de Ouro Preto. In: XIV Congresso Brasileiro de Geologia, Santos – SP.