|Title||Reconnaissance-scale till survey in the New Liskeard-Temagami region, Ontario: kimberlite indicator minerals and geochemistry|
|Author||McClenaghan, M B; Kjarsgaard, I M; Kjarsgaard, B A|
|Source||Geological Survey of Canada, Open File 4086, 2017, 19 pages, https://doi.org/10.4095/306189 (Open Access)|
|Links||Canadian Database of Geochemical Surveys, downloadable
|Links||Banque de données de levés géochimiques du Canada,
|Publisher||Natural Resources Canada|
|Related||This publication supercedes McClenaghan, M B; Kjarsgaard, I
M; Kjarsgaard, B A; (2001). Reconnaissance-scale till survey in the New Liskeard-Temagami region, Ontario: kimberlite indicator minerals and geochemistry, Geological Survey of Canada, Open File 4086|
|Related||This publication is related to the following
|File format||pdf (Adobe® Reader®); rtf; xlsx (Microsoft Excel®)|
|NTS||31M/12SW; 31M/12SE; 31M/03SE; 31M/03NE; 31M/04; 31M/05; 31M/06SE; 31M/06NE; 31M/13SW; 31L/13; 31L/14SW; 31L/14NW; 41I/16SE; 41I/16NE; 41P/01SE; 41P/01NE; 41P/08SE; 41P/08NE; 41P/09SE|
|Area||New Liskeard; Temagami|
|Lat/Long WENS|| -80.1333 -79.3167 47.6333 46.8000|
|Subjects||geochemistry; surficial geology/geomorphology; economic geology; mineral exploration; exploration methods; drift prospecting; till analyses; till geochemistry; tills; mineral deposits; kimberlites;
source rocks; lithology; plutonic rocks; igneous rocks; ilmenite; chromite; garnet; diopside; gold; pebble lithology; indicator minerals; indicator mineral geochemistry; Phanerozoic; Cenozoic; Quaternary|
|Illustrations||location maps; photographs; tables; geoscientific sketch maps; flow diagrams; plots; ternary diagrams|
|Program||Targeted Geoscience Initiative (TGI-1), 2000-2003|
|Released||2017 11 28|
|Abstract||This report describes results of a reconnaissance-scale kimberlite indicator mineral (KIM) till survey in the area south of the known Lake Timiskaming kimberlite field, between New Liskeard and Marten
River. The survey provides information on the regional background content of KIM in till, the nature of KIM signatures in till just down-ice of known kimberlites, and the distribution of KIM anomalies that warrant further investigation.|
phases of flow are associated with erosion, transportation and deposition of till in the region. The main carriers of glacial debris, however, were the two oldest ice flows to the southwest and south. A large dispersal train of Paleozoic limestone
derived from upper Lake Timiskaming trends south-southwest across the area, but has been truncated in its proximal part (Latchford area) by the last southeast ice flow indicating that in this area, southeast ice flow was a major carrier of debris.
These situations have to be taken into consideration in the interpretation of dispersal trains formed by the three major ice flows.
Mg-ilmenite is the most abundant and widespread KIM in the till in the study area. Chromite occurs in approximately
the same till samples that contain Mg-ilmenite, but is generally present in lower abundances. Pyrope in till is approximately half as abundant as Mg-ilmenite. Cr-diopside is similar in abundance to pyrope and is present in almost every sample.
Elevated Cr-diopside abundances that are not accompanied by other KIMs likely are not from kimberlite. Anomalous concentrations of kimberlite indicator minerals in till occur: on the Red Squirrel Road; near Temagami; along Highway 11 in the central
part of the study area; on the east side of Lake Timiskaming; and on the Rabbit Lake forest access road. Some of these anomalies coincide with anomalies identified by the OGS in their recent stream sediment survey (Allan, 2001). Additional till
sampling combined with geophysics should be conducted to determine the extent of the KIM anomalies and trace them to their bedrock source, with a sample spacing that is much smaller (<500 m) than used in this reconnaissance survey.