Published March 2000 | Version v1
Journal article Metadata-only

Constraining the age of Neoproterozoic glaciation in eastern Brazil: first U-Pb (SHRIMP) data of detrital zircons

Creators

  • 1. Minas Gerais Univ., Belo Horizonte, MG (Brazil). Inst. de Geociencias
  • 2. Sao Paulo Univ., SP (Brazil). Inst. de Geociencias
  • 3. Australian National Univ., Canberra, ACT (Australia). Research School of Earth Sciences

Description

Detrital zircons extracted from a diamictite-bearing formation of the Macaubas Group, located within the Aracuai Belt (Eastern Brazil), were dated using a Sensitive High-Resolution Ion Microprobe (SHRIMP). The youngest reliable measurement sets the upper limit for the age of the glaciation at 950 ma. The main group of zircons (1000-950 Ma) is a good evidence of a magmatic episode, interpreted as related to the rift stage of the Aracuai-West-Congo basin system. (author)

Additional details

Publishing Information

Journal Title
Revista Brasileira de Geociencias
Journal Volume
30
Journal Issue
1
Journal Page Range
p. 58-61
ISSN
0375-7536
CODEN
RBGCAS

Conference

Title
31. International geological congress
Dates
6-17 Aug 2000
Place
Rio de Janeiro, RJ (Brazil)

INIS

Country of Publication
Brazil
Country of Input or Organization
Brazil
INIS RN
32046608
Subject category
S58: GEOSCIENCES;
Resource subtype / Literary indicator
Conference
Descriptors DEI
BRAZIL; CONGLOMERATES; DOLOMITE; GEOLOGIC HISTORY; GNEISSES; GRANITES; ION MICROPROBE ANALYSIS; ISOTOPE DATING; LEAD 204; LEAD 206; LEAD 207; MAGMA; MAGMATISM; QUARTZITES; RIFT ZONES; SANDSTONES; SEDIMENTATION; URANIUM 235; URANIUM 238; ZIRCON
Descriptors DEC
ACTINIDE NUCLEI; AGE ESTIMATION; ALPHA DECAY RADIOISOTOPES; CARBONATE MINERALS; CHEMICAL ANALYSIS; DEVELOPING COUNTRIES; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; GEOLOGIC STRUCTURES; HEAVY NUCLEI; HOURS LIVING RADIOISOTOPES; IGNEOUS ROCKS; INTERNAL CONVERSION RADIOISOTOPES; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; LATIN AMERICA; LEAD ISOTOPES; METAMORPHIC ROCKS; MICROANALYSIS; MILLISEC LIVING RADIOISOTOPES; MINERALS; MINUTES LIVING RADIOISOTOPES; NONDESTRUCTIVE ANALYSIS; NUCLEI; PLUTONIC ROCKS; RADIOISOTOPES; ROCKS; SEDIMENTARY ROCKS; SILICATE MINERALS; SOUTH AMERICA; SPONTANEOUS FISSION RADIOISOTOPES; STABLE ISOTOPES; URANIUM ISOTOPES; YEARS LIVING RADIOISOTOPES

Optional Information

Notes
20 refs., 4 figs., 1 tab., 1 graph