Skip to main content

The Paredão kimberlite, Western Minas Gerais, Brazil: field relations, chemical data and host rocks

Buy Article:

$39.00 plus tax (Refund Policy)

Abstract:

The Paredão kimberlite (Upper-Cretaceous) forms a circular-amoeboid depression of about 30 ha. It is emplaced in Neoproterozoic carbonates of the Bambuí Group (calcilutites, calcarenites and calcirudites of the Lagoa do Jacaré Formation) and shows a well-defined crater facies formed by pyroclastic deposits. The diatreme facies, not well observed, is deeply weathered, forming a homogeneous brown-greenish mass of clay material covered by soils. Field relations between the pipe and the host-rocks are marked by a significant difference in soil color and topography. Geological boundaries have been established through conventional geological mapping, enhanced by a radiometric prospecting using a total-count scintillometer. Furthermore, heavy-mineral prospecting was carried-out and the recovered kimberlite indicator minerals (pyrope, diopside, ilmenite and spinel) were analyzed. Chemical data placed the Paredão Kimberlite in the "non-diamondiferous" field.

Keywords: BRAZIL; CARBONATE HOST ROCKS OF KIMBERLITE; ILMENITE AND DIOPSIDE CHEMICAL DATA; KIMBERLITE; KIMBERLITE INDICATOR MINERALS; KIMBERLITE PYROCLASTIC FACIES; PYROPE; UPPER CRETACEOUS; WESTERN MINAS GERAIS

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0077-7749/2009/0253-0115

Publication date: July 1, 2009

More about this publication?
  • Neues Jahrbuch für Geologie und Paläontologie continuously publishes current original contributions from all fields of geology, ever since its foundation in 1807. All published contributions are in the English language.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • ingentaconnect is not responsible for the content or availability of external websites
schweiz/njbgeol/2009/00000253/00000001/art00009
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more